Part Details for L4981A by STMicroelectronics
Results Overview of L4981A by STMicroelectronics
- Distributor Offerings: (4 listings)
- Number of FFF Equivalents: (0 replacements)
- Tariff Estimator: (Available) NEW
- Number of Functional Equivalents: (1 option)
- 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.
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L4981A Information
L4981A by STMicroelectronics is a Switching Regulator or Controller.
Switching Regulator or Controllers are under the broader part category of Power Circuits.
A power circuit delivers electricity in order to operate a load for an electronic device. Power circuits include transformers, generators and switches. Read more about Power Circuits on our Power Circuits part category page.
Price & Stock for L4981A
| Part # | Distributor | Description | Stock | Price | Buy | |
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Bristol Electronics | 42 |
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RFQ | ||
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Chip Stock | PowerFactorController,Current-mode,2A,115kHzSwitchingFreq-Max,BCDMOS,PDIP20 | 4136 |
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RFQ | |
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Vyrian | Other Function Semiconductors | 1138 |
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RFQ | |
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Win Source Electronics | IC PFC CTRLR AVERAGE CURR 20DIP | 2636 |
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$2.0855 / $3.1282 | Buy Now |
US Tariff Estimator: L4981A 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.
Part Details for L4981A
L4981A CAD Models
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L4981A Part Data Attributes
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L4981A
STMicroelectronics
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Datasheet
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L4981A
STMicroelectronics
L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode
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| Rohs Code | Yes | |
| Part Life Cycle Code | Obsolete | |
| Ihs Manufacturer | STMICROELECTRONICS | |
| Part Package Code | DIP | |
| Package Description | DIP-20 | |
| Pin Count | 20 | |
| Reach Compliance Code | Compliant | |
| ECCN Code | EAR99 | |
| HTS Code | 8542.39.00.01 | |
| Samacsys Manufacturer | STMicroelectronics | |
| Analog IC - Other Type | POWER FACTOR CONTROLLER | |
| Control Mode | CURRENT-MODE | |
| Control Technique | PULSE WIDTH MODULATION | |
| Input Voltage-Max | 19.5 V | |
| Input Voltage-Min | 11 V | |
| Input Voltage-Nom | 18 V | |
| JESD-30 Code | R-PDIP-T20 | |
| JESD-609 Code | e3 | |
| Number of Functions | 1 | |
| Number of Terminals | 20 | |
| Operating Temperature-Max | 125 °C | |
| Operating Temperature-Min | -40 °C | |
| Output Current-Max | 2 A | |
| Package Body Material | PLASTIC/EPOXY | |
| Package Code | DIP | |
| Package Equivalence Code | DIP20,.3 | |
| Package Shape | RECTANGULAR | |
| Package Style | IN-LINE | |
| Qualification Status | Not Qualified | |
| Seated Height-Max | 3.93 mm | |
| Surface Mount | NO | |
| Switcher Configuration | SINGLE | |
| Switching Frequency-Max | 115 kHz | |
| Technology | BCDMOS | |
| Temperature Grade | AUTOMOTIVE | |
| Terminal Finish | MATTE TIN | |
| Terminal Form | THROUGH-HOLE | |
| Terminal Pitch | 2.54 mm | |
| Terminal Position | DUAL | |
| Width | 7.62 mm |
Alternate Parts for L4981A
This table gives cross-reference parts and alternative options found for L4981A. 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 L4981A, 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.
| Part Number | Manufacturer | Composite Price | Description | Compare |
|---|---|---|---|---|
| L4981B | STMicroelectronics | Check for Price | L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode | L4981A vs L4981B |
L4981A Frequently Asked Questions (FAQ)
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The maximum input voltage that can be applied to the L4981A is 40V, but it's recommended to keep it below 30V for reliable operation.
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The inductor value depends on the output current, switching frequency, and input voltage. A good starting point is to use the inductor value recommended in the datasheet (e.g., 10uH) and adjust based on your specific application requirements.
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The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage. Choose a capacitor with a value between 10nF to 100nF, depending on the switching frequency and output current.
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Ensure good thermal design, use a heat sink if necessary, and keep the device away from heat sources. Monitor the junction temperature (TJ) and adjust the design as needed to keep TJ below 150°C.
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The minimum ESR required for the output capacitor depends on the output current and switching frequency. A good rule of thumb is to choose an output capacitor with an ESR of 0.1 ohms or less.