Specifications
| Type | Description |
|---|---|
| Part Number | LM2937 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | TO-220 (NDE) 3-pin, 14.986 mm x 10.66 mm; SOT-223 (DCY) 4-pin, 6.50 mm x 3.5 mm; TO-263/DDPAK (KTT) 3-pin, 10.18 mm x 8.41 mm |
| Regulator polarity | Positive voltage regulator; Device description |
| Rated output current | 500 mA; TO-220 and DDPAK/TO-263 packages |
| Rated output current | 400 mA; SOT-223 package |
| Output voltage tolerance | 5%; Under all operating conditions |
| Typical dropout voltage | 0.5 V; Full rated load current |
| Ensured maximum dropout voltage | 1 V; Full load current over full operating temperature range |
| Output capacitor ESR stability range | < 3 ohm; Output bypass capacitor required for stability |
| Typical quiescent current | 10 mA; 500-mA load current and input-to-output differential > 3 V |
| Input transient protection | 60 V; Automotive load dump transient protection |
| Reverse transient protection | -50 V; Automotive load dump transient protection |
| Continuous input voltage absolute maximum | 26 V max; Over operating free-air temperature range |
| Transient input voltage absolute maximum | 60 V max; t <= 100 ms |
| Internal power dissipation | Internally limited; Absolute maximum rating |
| Maximum junction temperature | 150 °C; Absolute maximum rating |
| Storage temperature range | -65 to 150 °C; Handling rating |
| ESD rating, HBM | -2000 to 2000 V; ANSI/ESDA/JEDEC JS-001, all pins |
| Operating junction temperature | -40 to 125 °C; LM2937ET (NDE), LM2937ES (KTT) |
| Operating junction temperature | -40 to 85 °C; LM2937IMP (DCY) |
| Recommended input voltage | VOUT + 1 V to 26 V; Recommended operating conditions |
| Thermal resistance junction-to-ambient | 77.9 °C/W; NDE TO-220, 3 pins |
| Thermal resistance junction-to-ambient | 41.8 °C/W; KTT TO-263/DDPAK, 3 pins |
| Thermal resistance junction-to-ambient | 58.3 °C/W; DCY SOT-223, 4 pins |
| Thermal resistance junction-to-case top | 35.5 °C/W; NDE TO-220, 3 pins |
| Thermal resistance junction-to-case top | 43.5 °C/W; KTT TO-263/DDPAK, 3 pins |
| Thermal resistance junction-to-case top | 39.2 °C/W; DCY SOT-223, 4 pins |
| Thermal resistance junction-to-board | 70.6 °C/W; NDE TO-220, 3 pins |
| Thermal resistance junction-to-board | 0.8 °C/W; KTT TO-263/DDPAK, 3 pins |
| Thermal resistance junction-to-board | N/A; DCY SOT-223, 4 pins |
| Thermal resistance junction-to-case bottom | 1 °C/W; NDE TO-220, 3 pins |
| Thermal resistance junction-to-case bottom | 22.5 °C/W; KTT TO-263/DDPAK, 3 pins |
| Thermal resistance junction-to-case bottom | 22.5 °C/W; DCY SOT-223, 4 pins |
| LM2937-5 output voltage | 4.85 V min, 5 V typ, 5.15 V max; TA=TJ=25°C, 5 mA <= IOUT <= IOUT(MAX), VIN=VOUT(NOM)+5 V, COUT=10 uF |
| LM2937-5 output voltage | 4.75 V min, 5 V typ, 5.25 V max; 5 mA <= IOUT <= IOUT(MAX), over recommended operating temperature range |
| LM2937-5 line regulation | 15 mV typ, 50 mV max; VOUT+2 V <= VIN <= 26 V, IOUT=5 mA |
| LM2937-5 load regulation | 5 mV typ, 50 mV max; 5 mA <= IOUT <= IOUT(MAX) |
| LM2937-5 quiescent current | 2 mA typ, 10 mA max; VOUT+2 V <= VIN <= 26 V, IOUT=5 mA |
| LM2937-5 quiescent current | 10 mA typ, 20 mA max; VIN=VOUT+5 V, IOUT=IOUT(MAX) |
| LM2937-5 output noise voltage | 150 uVrms typ; 10 Hz to 100 kHz, IOUT=5 mA |
| LM2937-5 long-term stability | 20 mV typ; 1000 hours |
| LM2937-5 dropout voltage | 0.5 V typ, 1 V max; IOUT=IOUT(MAX) |
| LM2937-5 dropout voltage | 110 mV typ, 250 mV max; IOUT=50 mA |
| LM2937-5 short-circuit current | 0.6 A min, 1 A typ; Electrical characteristics |
| LM2937-5 peak line transient voltage | 60 V min, 75 V typ; tf < 100 ms, RL=100 ohm |
| LM2937-5 maximum operational input voltage | 26 V max; Electrical characteristics |
| LM2937-5 reverse DC input voltage | -15 V min, -30 V typ; VOUT >= -0.6 V, RL=100 ohm |
| LM2937-5 reverse transient input voltage | -50 V min, -75 V typ; tr < 1 ms, RL=100 ohm |
| LM2937-8 output voltage | 7.76 V min, 8 V typ, 8.24 V max; TA=TJ=25°C, 5 mA <= IOUT <= IOUT(MAX), VIN=VOUT(NOM)+5 V, COUT=10 uF |
| LM2937-8 output voltage | 7.6 V min, 8 V typ, 8.4 V max; 5 mA <= IOUT <= IOUT(MAX), over recommended operating temperature range |
| LM2937-8 line regulation | 24 mV typ, 80 mV max; VOUT+2 V <= VIN <= 26 V, IOUT=5 mA |
| LM2937-8 load regulation | 8 mV typ, 80 mV max; 5 mA <= IOUT <= IOUT(MAX) |
| LM2937-8 output noise voltage | 240 uVrms typ; 10 Hz to 100 kHz, IOUT=5 mA |
| LM2937-8 long-term stability | 32 mV typ; 1000 hours |
| LM2937-10 output voltage | 9.7 V min, 10 V typ, 10.3 V max; TA=TJ=25°C, 5 mA <= IOUT <= IOUT(MAX), VIN=VOUT(NOM)+5 V, COUT=10 uF |
| LM2937-10 output voltage | 9.5 V min, 10 V typ, 10.5 V max; 5 mA <= IOUT <= IOUT(MAX), over recommended operating temperature range |
| LM2937-10 line regulation | 30 mV typ, 100 mV max; VOUT+2 V <= VIN <= 26 V, IOUT=5 mA |
| LM2937-10 load regulation | 10 mV typ, 100 mV max; 5 mA <= IOUT <= IOUT(MAX) |
| LM2937-10 output noise voltage | 300 uVrms typ; 10 Hz to 100 kHz, IOUT=5 mA |
| LM2937-10 long-term stability | 40 mV typ; 1000 hours |
| LM2937-12 output voltage | 11.64 V min, 12 V typ, 12.36 V max; TA=TJ=25°C, 5 mA <= IOUT <= IOUT(MAX), VIN=VOUT(NOM)+5 V, COUT=10 uF |
| LM2937-12 output voltage | 11.4 V min, 12 V typ, 12.6 V max; 5 mA <= IOUT <= IOUT(MAX), over recommended operating temperature range |
| LM2937-12 line regulation | 36 mV typ, 120 mV max; VOUT+2 V <= VIN <= 26 V, IOUT=5 mA |
| LM2937-12 load regulation | 12 mV typ, 120 mV max; 5 mA <= IOUT <= IOUT(MAX) |
| LM2937-12 output noise voltage | 360 uVrms typ; 10 Hz to 100 kHz, IOUT=5 mA |
| LM2937-12 long-term stability | 44 mV typ; 1000 hours |
| Pin 1 function | INPUT, unregulated voltage input; NDE, KTT, and DCY packages |
| Pin 2 function | GND, ground; NDE, KTT, and DCY packages |
| Pin 3 function | OUTPUT, regulated voltage output; Requires output capacitor to maintain stability |
| Tab function | GND, thermal and ground connection; Internally connected to pin 2; connect to GND or leave floating |
| Datasheet Status | request_only |
Product Overview
The LM2937 is a Texas Instruments positive voltage regulator in the Power_Management category. The device is described as a 500-mA low dropout regulator, with rated output current of 500 mA in TO-220 and TO-263/DDPAK packages and 400 mA in the SOT-223 package.
Output options include LM2937-5, LM2937-8, LM2937-10, and LM2937-12 variants with typical regulated outputs of 5 V, 8 V, 10 V, and 12 V. Across operating conditions, output voltage tolerance is specified at 5%. Dropout voltage is 0.5 V typical at full rated load, with 1 V ensured maximum over the full operating temperature range.
The package set includes TO-220 (NDE), SOT-223 (DCY), and TO-263/DDPAK (KTT). Pin functions are INPUT on pin 1, GND on pin 2, and OUTPUT on pin 3. The tab is internally connected to pin 2 and functions as a ground and thermal connection. An output bypass capacitor with ESR below 3 ohm is required for stability.
Key Features
- Positive voltage regulator for fixed regulated outputs
- 500 mA rating in TO-220 and TO-263 packages
- 400 mA rating in the SOT-223 package
- 5% output voltage tolerance across operating conditions
- 0.5 V typical dropout at full rated load
- 1 V ensured maximum dropout over operating temperature
- 60 V input transient protection for load-dump events
- -50 V reverse transient protection for load-dump events
- Recommended input range from VOUT + 1 V to 26 V
- Output capacitor ESR below 3 ohm required for stability
Typical Applications
- Automotive load-dump protected supplies
- Positive voltage regulation
- 5 V regulated rails
- 8 V regulated rails
- 10 V regulated rails
- 12 V regulated rails
- TO-220 regulator assemblies
- SOT-223 regulator assemblies
- TO-263 DDPAK regulator assemblies
Procurement Notes
When requesting a quote for LM2937, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of regulator is the LM2937?
The LM2937 is a Texas Instruments positive voltage regulator described as a 500-mA low dropout regulator. It belongs to the Power_Management category and supports fixed-output variants with typical outputs of 5 V, 8 V, 10 V, and 12 V.
What packages are specified for the LM2937?
The extracted package data lists TO-220 (NDE) 3-pin, SOT-223 (DCY) 4-pin, and TO-263/DDPAK (KTT) 3-pin package options. Rated output current is 500 mA for TO-220 and TO-263/DDPAK, and 400 mA for SOT-223.
What input voltage range is recommended for the LM2937?
The recommended input voltage is VOUT + 1 V to 26 V. The continuous input voltage absolute maximum is 26 V, and transient input voltage absolute maximum is 60 V for t <= 100 ms.
What capacitor condition is required for LM2937 stability?
The output pin requires an output capacitor to maintain stability. The extracted facts specify an output bypass capacitor ESR stability range of less than 3 ohm.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 20, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.