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Risk Rank

Risk Rank is a proprietary algorithm Supplyframe has developed to quantify component risk rank using multiple data points. This ranking helps engineers and buyers determine whether alternates should be sought for parts that are deemed as high risk.

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Risk Rank is determined by a combination of factors such as product lifecycle status, price & inventory votality, current inventory availability, and much more. Even the availability of manufacturer specifications and part documentation, such as datasheets and reference designs, have an impact on determining the overall riskiness of a part.

The risk is characterized across three product phases:

  • Design
  • Production
  • Long Term

For Purchasing Risk Rank, we focus on the Production and the Long Term Phases on Findchips in our evaluation of Risk.

Production Phase

The production phase is when the product is being assembled. Sourcing parts reliably is the essential task during this phase, as it determines whether the product can continue production. During the production phase, there is no time to test new components if something goes awry – the design is the locked-in and a primary risk factor is the component availability in the marketplace. It is possible to utilize alternative parts if things go wrong during this phase, but they need to be FFF (form, fit, function) compatible. Therefore, if a part is available in the online marketplace and has available FFF components, it will be listed as lower risk.

Long Term Phase

The amount of time that a product is manufactured often depends on the industry. Some automobile electronics are made consistently for 5-10 years, whereas military and industrial electronics could be produced from anywhere from 30-50 years.

This means part risk goes up with the likelihood of obsolescence. If a chip manufacturer decides to stop making a particular chip, it is supremely disruptive to mature products, because there may not even be replacement parts available. Other factors like environmental certifications (RoHS) feed into this as well, as non-certified parts are more likely to become obsolete in the future.

We combine both of these aspects into a Purchasing Risk Rank score in order to focus in on risk elements that would be most pertinent for purchasers to be aware of.

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What is purchasing risk rank?

Purchasing Risk Rank is determined by in-depth analysis across risk factors of production risk and long term risk of a given part.

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Part Details for: MMBT3904LT1G

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Risk Rank

Risk Rank is a proprietary algorithm Supplyframe has developed to quantify component risk rank using multiple data points. This ranking helps engineers and buyers determine whether alternates should be sought for parts that are deemed as high risk.

Risk Rank Example

Risk Rank is determined by a combination of factors such as product lifecycle status, price, inventory votality, current inventory availability, and much more. Even the availability of manufacturer specifications and part documentation, such as datasheets and reference designs, have an impact on determining the overall riskiness of a part.

The risk is characterized across three product phases:

  • Design
  • Production
  • Long Term

We focus on the Design Phase on Findchips in our evaluation of Risk.

Design Phase

The design phase of a product is the beginning of the product lifecycle. This is when engineers are doing analysis of components in the marketplace, determining which specifications are most important for their design and assessing the cost impact of using this particular component. While this is early in the product lifecycle, choices at this point can severely impact a product much later on when the product is being made. Additionally, this stage is the one furthest from a product being made, which is why we focus on metrics of stability over time when determining Design Risk.

Risk Rank Breakdown

Risk Rank: Design Risk

What is design risk rank?

Design Risk Rank is determined by in-depth analysis across risk factors, including part availability, functional equivalents, lifecycle, and more.

Alternate Parts for: MMBT3904LT1G

Part Number Description Manufacturer Compare
MMBT3904LT3 Transistors Small Signal Bipolar Transistor, 0.2A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, TO-236AB, Motorola Semiconductor Products MMBT3904LT1G vs MMBT3904LT3
BSR17A Transistors Transistor, Allegro MicroSystems LLC MMBT3904LT1G vs BSR17A
MMBT3904T/R7 Transistors Small Signal Bipolar Transistor, 0.2A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, ROHS COMPLIANT, PLASTIC PACKAGE-3 PanJit Semiconductor MMBT3904LT1G vs MMBT3904T/R7
FMMT3904TC Transistors Small Signal Bipolar Transistor, 0.2A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, Diodes Incorporated MMBT3904LT1G vs FMMT3904TC
MMBT3904-13 Transistors Small Signal Bipolar Transistor, 0.2A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, PLASTIC PACKAGE-3 Diodes Incorporated MMBT3904LT1G vs MMBT3904-13
Part Number Description Manufacturer Compare
PN2221 Transistors Small Signal Bipolar Transistor, 0.8A I(C), 30V V(BR)CEO, 1-Element, NPN, Silicon, TO-92, Crimson Semiconductor Inc MMBT3904LT1G vs PN2221
NST3906F3T5G Transistors PNP Bipolar Transistor, SOT-1123, 1.0x0.6x0.37, 0.35P, 8000-REEL onsemi MMBT3904LT1G vs NST3906F3T5G
BC372RLRP Transistors 1000mA, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92 Motorola Mobility LLC MMBT3904LT1G vs BC372RLRP
MMBT3904-13 Transistors Small Signal Bipolar Transistor, 0.2A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, PLASTIC PACKAGE-3 Diodes Incorporated MMBT3904LT1G vs MMBT3904-13
FMMT3904TC Transistors Small Signal Bipolar Transistor, 0.2A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, Diodes Incorporated MMBT3904LT1G vs FMMT3904TC
PN2484D74Z Transistors TRANSISTOR NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, BIP General Purpose Small Signal National Semiconductor Corporation MMBT3904LT1G vs PN2484D74Z
BC338-AMMO Transistors TRANSISTOR 500 mA, 25 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92, BIP General Purpose Small Signal NXP Semiconductors MMBT3904LT1G vs BC338-AMMO

Resources and Additional Insights

Reference Designs

  • 28Vdc Input Super Cap Charger with Boost Converter for Bus Holdup Reference Design - PMP7327.2 - TI Tool Folder
    PMP7327: This reference design uses the BQ24640 super cap charging controller to charge a large bank of super caps to a voltage below the input bus voltage. During an input bus dropout, the energy from the super caps is used to power a boost converter that can supply 10A of output current at 26.2V. This output can be used to hold up the bus voltage for up to 10 seconds (260W for 10 sec).
  • 36-60Vin, 350W Slow Drain Modulation Power Converter with PSFB ZTE and HSHB Reference Design - PMP7246.2 - TI Tool Folder
    PMP7246: This is a 350W High Speed Full Bridge Phase Shift ZVT Synchronous Rectification DC/DC reference design. It is built for telecom applications to supply a RF Power Amplifier stage. The design is utilizing UCC28950 voltage mode forward and average current limitation backward converter (two quadrant converter). It can modulate output voltage from 20V to 32V within 200us (at maximum 200uF of capacitive load) – so called: slow drain modulation. The converter has full load steps capability as well. It is a very small design for high sophisticated telecom applications. The system can also be used for all other two quadrant applications. Input voltage range: 36VDC-60VDC; Output voltage: 20VDC…32VDC (adjustable); Output current: 12A (18Apeak).
  • Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps - PMP9780.2 - TI Tool Folder
    PMP9780: This reference design details a display power circuit which generates a bipolar voltage rail for source drivers and additional supplies for gate drivers. Charge pumps are used to generate the voltage supply for gate drivers, which makes this design easy to implement. By using only one dc-dc converter to generate four voltage rails and therefore minimizing the amount of inductances, this circuit allows small design size.
  • 360W Digital Controlled Phase Shift Full Bridge converter
    TIDA-00412: DC-DC power converter with digital control using UCD3138CC64EVM-030 daughter-card. The daughter-card with preloaded firmware providing the required control functions for a Phase Shift Full Bridge converter. The TIDA-00412 (UCD3138PSFBEVM-027) accepts a DC input from 370 to 400 VDC, and outputs a typical 12 VDC with full-load output power at 360 W, or full output current of 30 A.
  • 120V AC Input 200W Interleaved Flyback for Battery Charging Applications
    TIDA-00200: The TI Design TIDA-00200 proposes an interleaved flyback topology for battery charger applications that require an output power level of ~200W with a minimized bill of material. Besides the actual electronic components the efforts for cooling are a major contributor to the overall design cost. By taking advantage of the LM5032 High Voltage Dual Interleaved Current Mode Controller the design accomplishes great efficiency of 90% at full load and at the same time spreads out the heat for greatly reduced cooling efforts. A fan is typically not needed; the need for smaller form factor heat sinks provides additional design flexibility.
  • Ultrasonic Distance Measurement BoosterPack Reference Design
    TIDA-00462: The TIDA-00462 ultrasonic distance measurement reference design can measure the distance up to 99 inches with an accuracy of ±1.5 inches. The scope of this design guide is to give system designers a head-start in integrating TI’s industrial ultra-low-power MCU, analog signal conditioning, and power management technologies into their end-equipment systems. This design guide describes the principle of operation and basic design process for a low cost distance measuring system based on ultrasonic sound utilizing the MSP430 ultralow-power microcontroller. This design guide also addresses component selection, design theory, and test results of the TI Design system. All the relevant design files like Schematics, BOM, Layer plots, Altium files, Gerber and MSP430 MCU firmware are provided.
  • 350W Slow Drain Modulation Power Converter
    PMP5726: The PMP5726 is 350W High Speed Full Bridge Phase Shift ZVT – Galvanic Isolated Full Bridge Synchronous Rectification DC/DC reference design. It is built for telecom applications to supply a RF Power Amplifier stage. The design is utilizing UCC28950 voltage mode forward and average current limitation backward converter (two quadrant converter). It is capable to modulate output voltage from 20V to 32V within 200us (at maximum 200uF of capacitive load) – so called: slow drain modulation. The converter has full load steps capability as well. It is a very small design for high sophisticated telecom applications. The system can be used also for every other two quadrant applications. Input voltage range: 36VDC-60VDC; Output voltage: 20VDC…32VDC (adjustable); Output current: 11.5A (18Apeak)
  • 36-60Vin, 350W Slow Drain Modulation Power Converter with PSFB ZTE and HSHB Reference Design
    PMP7246.2: This is a 350W High Speed Full Bridge Phase Shift ZVT Synchronous Rectification DC/DC reference design. It is built for telecom applications to supply a RF Power Amplifier stage. The design is utilizing UCC28950 voltage mode forward and average current limitation backward converter (two quadrant converter). It can modulate output voltage from 20V to 32V within 200us (at maximum 200uF of capacitive load) – so called: slow drain modulation. The converter has full load steps capability as well. It is a very small design for high sophisticated telecom applications. The system can also be used for all other two quadrant applications. Input voltage range: 36VDC-60VDC; Output voltage: 20VDC…32VDC (adjustable); Output current: 12A (18Apeak).
  • Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps
    PMP9780.3: This reference design details a display power circuit which generates a bipolar voltage rail for source drivers and additional supplies for gate drivers. Charge pumps are used to generate the voltage supply for gate drivers, which makes this design easy to implement. By using only one dc-dc converter to generate four voltage rails and therefore minimizing the amount of inductances, this circuit allows small design size.
  • Isolated Flyback for Metering using UCC28610 w/ input of 147 to 400 VAC 35V@0.06A
    PMP7040.2: The PMP7040.2(35V@0.06A) reference design is a Isolated DCM Flyback for 3phase smart meter,147-400VAC,35V@0.06A - multiple outputs Flyback which uses a UCC28610 and was intended for Metering applications. It can generate an Isolated 35 volt output at 0.06 Amps from an input and was intended for 147 to 400 Volts AC. This design has multiple outputs.
  • Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps
    PMP9780.0: This reference design details a display power circuit which generates a bipolar voltage rail for source drivers and additional supplies for gate drivers. Charge pumps are used to generate the voltage supply for gate drivers, which makes this design easy to implement. By using only one dc-dc converter to generate four voltage rails and therefore minimizing the amount of inductances, this circuit allows small design size.
  • 3-ph E-Meter. Input voltage: 2 and 3 phase; outputs: 16.5V@300mApk, 12V@500mA, 3.3V@100mApk, 1.9V@15
    PMP7146.1: The PMP7146 has been designed especially for E-meters with PLC (power line communication) on board. The input filter shows high impedance to the PLC transmitter and the controller LM5021 works in constant switching frequency. A settable skip-mode improves the efficiency at light load. Two Bucks and an LDO supply the power to the digital section of the E-meter.
  • Class 4- High Efficiency 12V Class 4 PoE Converter Reference Design
    PMP8812: This design is a 12V/2.1A synchronous flyback converter for high efficiency PoE applications. The TPS23752 combines the Powered Device and PWM controllers in one package. Additional features are synchronous rectifier disable for improved light load efficiency and support for ulta low power sleep mode.
  • Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps
    PMP9780.1: This reference design details a display power circuit which generates a bipolar voltage rail for source drivers and additional supplies for gate drivers. Charge pumps are used to generate the voltage supply for gate drivers, which makes this design easy to implement. By using only one dc-dc converter to generate four voltage rails and therefore minimizing the amount of inductances, this circuit allows small design size.
  • Class 2 Dual Output High Efficiency Non-Isolated Synch Flyback Conv for PoE Apps Reference Design
    PMP9012: This reference design is an IEEE802.3af, type 1 compliant powered device. The synchronous flyback converter provides good efficiency with dual outputs (5V/580mA, 3.3V/900mA), non-isolated. It can be used in PoE applications such as a video or VoIP phones. The TPS23785BPWP contains both the PoE powered device and the PWM controller functions.
  • 200W Natural Interleaving Transition-Mode PFC Flyback LED Driver Reference Design
    PMP10116: This design uses the UCC28063A transition-mode pfc controller to drive LEDs up to 700mA current from an AC input. This flyback pfc topology provides isolation and uses quasi-resonant mode control. It supports analog dimming on the output side.
  • 28Vdc Input Super Cap Charger with Boost Converter for Bus Holdup Reference Design
    PMP7327.2: This reference design uses the BQ24640 super cap charging controller to charge a large bank of super caps to a voltage below the input bus voltage. During an input bus dropout, the energy from the super caps is used to power a boost converter that can supply 10A of output current at 26.2V. This output can be used to hold up the bus voltage for up to 10 seconds (260W for 10 sec).
  • Isolated Flyback for Metering using UCC28610 w/ input of 147 to 400 VAC 20V@0.25A
    PMP7040.1: The PMP7040.1(20V@0.25A) reference design is a Isolated DCM Flyback for 3phase smart meter,147-400VAC,20V@0.25A - multiple outputs Flyback which uses a UCC28610 and was intended for Metering applications. It can generate an Isolated 20 volt output at 0.25 Amps from an input which uses a 147 to 400 Volts AC. This design has multiple outputs.
  • 28Vdc Input Super Cap Charger with Boost Converter for Bus Holdup Reference Design
    PMP7327.1: This reference design uses the BQ24640 super cap charging controller to charge a large bank of super caps to a voltage below the input bus voltage. During an input bus dropout, the energy from the super caps is used to power a boost converter that can supply 10A of output current at 26.2V. This output can be used to hold up the bus voltage for up to 10 seconds (260W for 10 sec).
  • 3-ph E-Meter. Input voltage: 2 and 3 phase; outputs: 16.5V@300mApk, 12V@500mA, 3.3V@100mApk, 1.9V@15
    PMP7146.4: The PMP7146 has been designed especially for E-meters with PLC (power line communication) on board. The input filter shows high impedance to the PLC transmitter and the controller LM5021 works in constant switching frequency. A settable skip-mode improves the efficiency at light load. Two Bucks and an LDO supply the power to the digital section of the E-meter.
  • Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps
    PMP9780.2: This reference design details a display power circuit which generates a bipolar voltage rail for source drivers and additional supplies for gate drivers. Charge pumps are used to generate the voltage supply for gate drivers, which makes this design easy to implement. By using only one dc-dc converter to generate four voltage rails and therefore minimizing the amount of inductances, this circuit allows small design size.
  • Class 4- 3.3V/7.6A High Efficiency Active Clamp Forward Converter for PoE Applications
    PMP7452: This converter reference design is used for Class 4 PoE applications where high efficiency is required. The active clamp forward converter with synchronous rectifiers provides excellent efficiency and small size for PoE applications such as a wireless access point. The TPS23754 contains both the PoE Powered Device and the PWM controller functions.
  • Class 4- Wide Input Range 15W PoE Converter
    PMP6659: PMP6659 is a flyback converter with synchronous rectification. It accepts input voltages of 10.8-57VDC/18-32VAC/PoE and has a 12V/1.25A output. This input and output combination is typically required for PoE security cameras. The synchronous rectifier provides excellent efficiency with the wide input voltage range.
  • 350W Constant Voltage - Constant Current (CVCC) Phase-Shifted Full Bridge reference design
    PMP9622: This reference design uses the UCC3895 Phase-Shifted Full Bridge controller to implement a high efficiency, 120VAC input to 44Vdc up to 8A output. The power supply is set up to be constant voltage-constant current. The voltage and current are set by fixed resistor values and could be set by micro-processor in the actual product. The design is biased by a low-cost BJT Flyback using the UCC28720 PWM controller.
  • 36-60Vin, 350W Slow Drain Modulation Power Converter with PSFB ZTE and HSHB Reference Design
    PMP7246.1: This is a 350W High Speed Full Bridge Phase Shift ZVT Synchronous Rectification DC/DC reference design. It is built for telecom applications to supply a RF Power Amplifier stage. The design is utilizing UCC28950 voltage mode forward and average current limitation backward converter (two quadrant converter). It can modulate output voltage from 20V to 32V within 200us (at maximum 200uF of capacitive load) – so called: slow drain modulation. The converter has full load steps capability as well. It is a very small design for high sophisticated telecom applications. The system can also be used for all other two quadrant applications. Input voltage range: 36VDC-60VDC; Output voltage: 20VDC…32VDC (adjustable); Output current: 12A (18Apeak).
  • 3-ph E-Meter. Input voltage: 2 and 3 phase; outputs: 16.5V@300mApk, 12V@500mA, 3.3V@100mApk, 1.9V@15
    PMP7146.3: The PMP7146 has been designed especially for E-meters with PLC (power line communication) on board. The input filter shows high impedance to the PLC transmitter and the controller LM5021 works in constant switching frequency. A settable skip-mode improves the efficiency at light load. Two Bucks and an LDO supply the power to the digital section of the E-meter.
  • 3-ph E-Meter. Input voltage: 2 and 3 phase; outputs: 16.5V@300mApk, 12V@500mA, 3.3V@100mApk, 1.9V@15
    PMP7146.2: The PMP7146 has been designed especially for E-meters with PLC (power line communication) on board. The input filter shows high impedance to the PLC transmitter and the controller LM5021 works in constant switching frequency. A settable skip-mode improves the efficiency at light load. Two Bucks and an LDO supply the power to the digital section of the E-meter.
  • Isolated Flyback for Metering using UCC28610 w/ input of 147 to 400 VAC 35V@0.06A - PMP7040.2 - TI Tool Folder
    PMP7040: The PMP7040.2(35V@0.06A) reference design is a Isolated DCM Flyback for 3phase smart meter,147-400VAC,35V@0.06A - multiple outputs Flyback which uses a UCC28610 and was intended for Metering applications. It can generate an Isolated 35 volt output at 0.06 Amps from an input and was intended for 147 to 400 Volts AC. This design has multiple outputs.

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