| Part Number | Manufacturer | Composite Price | Description | Compare |
|---|---|---|---|---|
| TIP121BA | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121BA |
| TIP121BG | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121BG |
| TIP121 | Microsemi Corporation (now Microchip) | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, NPN, Silicon, TO-220, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121 |
| TIP121AU | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121AU |
| TIP121AS | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121AS |
| TIP121BV | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121BV |
| TIP121DW | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121DW |
| TIP121BC | onsemi | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121BC |
| TIP121 | Transys Electronics Limited | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, TO-220AB, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121 |
| TIP121 | Continental Device India Ltd | Check for Price | Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, TO-220AB, Plastic/Epoxy, 3 Pin | TIP121 vs TIP121 |
Part Details for TIP121 by STMicroelectronics
Results Overview of TIP121 by STMicroelectronics
- Distributor Offerings: (28 listings)
- Number of FFF Equivalents: (10 replacements)
- Tariff Estimator: (Available) NEW
- Number of Functional Equivalents: (10 options)
- CAD Models: (Available)
- Part Data Attributes: (Available)
- Reference Designs: (Not Available)
Tip: Data for a part may vary between manufacturers. You can filter for manufacturers on the top of the page next to the part image and part number.
TIP121 Information
TIP121 by STMicroelectronics is a Power Bipolar Transistor.
Power Bipolar Transistors are under the broader part category of Transistors.
A transistor is a small semiconductor device used to amplify, control, or create electrical signals. When selecting a transistor, factors such as voltage, current rating, gain, and power dissipation must be considered, with common types. Read more about Transistors on our Transistors part category page.
Price & Stock for TIP121
| Part # | Distributor | Description | Stock | Price | Buy | |
|---|---|---|---|---|---|---|
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DISTI #
64AH9000
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Newark | Trans, Darlington, Tip121, |Stmicroelectronics TIP121 RoHS: Compliant Min Qty: 1 Package Multiple: 1 Date Code: 0 Container: Bulk | 3281 |
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$0.3390 / $1.1400 | Buy Now |
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DISTI #
497-2537-5-ND
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DigiKey | TRANS NPN DARL 80V 5A TO-220 Min Qty: 1 Container: Tube |
1810 Tube |
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$0.4880 / $2.0200 | Buy Now |
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DISTI #
7904190
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Verical | Trans Darlington NPN 80V 5A 2000mW 3-Pin(3+Tab) TO-220AB Tube RoHS: Exempt Min Qty: 29 Package Multiple: 1 | Americas - 26709 |
|
$0.1892 | Buy Now |
|
DISTI #
82781209
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Verical | Trans Darlington NPN 80V 5A 2000mW 3-Pin(3+Tab) TO-220AB Tube RoHS: Exempt Min Qty: 526 Package Multiple: 526 Date Code: 2427 | Americas - 526 |
|
$0.1911 | Buy Now |
|
DISTI #
511-TIP121
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Mouser Electronics | Darlington Transistors NPN Power Darlington RoHS: Compliant | 4695 |
|
$0.2300 / $1.0800 | Buy Now |
|
DISTI #
E02:0323_00213191
|
Arrow Electronics | Trans Darlington NPN 80V 5A 2000mW 3-Pin(3+Tab) TO-220AB Tube RoHS: Exempt Min Qty: 1 Package Multiple: 1 Lead time: 20 Weeks Date Code: 2508 | Europe - 26732 |
|
$0.1897 / $0.1981 | Buy Now |
|
DISTI #
V36:1790_06568422
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Arrow Electronics | Trans Darlington NPN 80V 5A 2000mW 3-Pin(3+Tab) TO-220AB Tube COO: China RoHS: Exempt Min Qty: 1000 Package Multiple: 1000 Lead time: 20 Weeks Date Code: 2427 | Americas - 526 |
|
$0.1911 | Buy Now |
|
DISTI #
70013772
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RS | TRANSISTOR, DARLINGTON, NPN, POWER, SWITCH, VO 80V, VI 5V, IO 5A, PD 65W, TO-220 Min Qty: 5 Package Multiple: 1 Container: Bulk | 0 |
|
$0.5400 / $0.6100 | RFQ |
|
|
STMicroelectronics | Low voltage NPN power Darlington transistor COO: Singapore Min Qty: 1 | 4955 |
|
$0.4000 / $1.0800 | Buy Now |
|
|
Future Electronics | TIP121 Series 80 V 5 A NPN Complementary Power Darlington Transistor TO-220-3 RoHS: Compliant pbFree: Yes Min Qty: 6000 Package Multiple: 50 Lead time: 20 Weeks Container: Tube | 0Tube |
|
$0.1930 / $0.2100 | Buy Now |
US Tariff Estimator: TIP121 by STMicroelectronics
Calculations from this tool are estimations only for imports into the United States. Please refer to the distributor or manufacturer and reference official US government sources and authorities to verify any final purchase costs.
TIP121 CAD Models
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TIP121 Part Data Attributes
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TIP121
STMicroelectronics
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Datasheet
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TIP121
STMicroelectronics
Power Bipolar Transistor, 5A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, TO-220AB, Plastic/Epoxy, 3 Pin
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| Rohs Code | Yes | |
| Part Life Cycle Code | Active | |
| Part Package Code | TO-220AB | |
| Pin Count | 3 | |
| ECCN Code | EAR99 | |
| HTS Code | 8541.29.00.95 | |
| Factory Lead Time | 14 Weeks | |
| Collector Current-Max (IC) | 5 A | |
| Collector-Emitter Voltage-Max | 80 V | |
| Configuration | Darlington With Built-In Diode And Resistor | |
| DC Current Gain-Min (hFE) | 1000 | |
| JEDEC-95 Code | TO-220AB | |
| JESD-30 Code | R-PSFM-T3 | |
| JESD-609 Code | e3 | |
| Number of Elements | 1 | |
| Number of Terminals | 3 | |
| Operating Temperature-Max | 150 °C | |
| Package Body Material | Plastic/Epoxy | |
| Package Shape | Rectangular | |
| Package Style | Flange Mount | |
| Polarity/Channel Type | Npn | |
| Power Dissipation Ambient-Max | 65 W | |
| Power Dissipation-Max (Abs) | 65 W | |
| Qualification Status | Not Qualified | |
| Surface Mount | No | |
| Terminal Finish | Matte Tin (Sn) | |
| Terminal Form | Through-Hole | |
| Terminal Position | Single | |
| Transistor Application | Switching | |
| Transistor Element Material | Silicon | |
| VCEsat-Max | 4 V |
Alternate Parts for TIP121
This table gives cross-reference parts and alternative options found for TIP121. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of TIP121, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.
TIP121 Frequently Asked Questions (FAQ)
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The maximum collector current for each Darlington pair is 500 mA. However, it's essential to ensure that the total current drawn from the device does not exceed 1 A to prevent overheating.
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The base resistor value can be calculated using the formula: Rb = (Vcc - Vbe) / (Ic / β), where Vcc is the supply voltage, Vbe is the base-emitter voltage, Ic is the collector current, and β is the current gain. A general rule of thumb is to use a base resistor value between 1 kΩ and 10 kΩ.
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The maximum voltage that can be applied to the TIP121 is 80 V. Exceeding this voltage may damage the device.
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While the TIP121 can be used as a switch, it's not suitable for high-frequency applications due to its relatively slow switching times (typically around 10 μs). For high-frequency applications, consider using a faster switching device, such as a MOSFET or a high-frequency transistor.
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To protect the TIP121 from back-EMF when driving inductive loads, use a flyback diode (also known as a freewheeling diode) in parallel with the inductive load. This diode allows the current to continue flowing when the transistor is turned off, preventing voltage spikes that could damage the device.