Specifications
| Type | Description |
|---|---|
| Part Number | LM337 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | TO-220AB Case 221AB; D2PAK Case 936 |
| Component Type | Power_IC |
| Output Current Capability | >1.5 A; General device capability |
| Adjustable Output Voltage Range | -1.2 V to -37 V; General device capability |
| Input-Output Voltage Differential | 40 Vdc max; TA=25°C |
| Power Dissipation, Case 221A | Internally limited; TA=25°C |
| Thermal Resistance Junction-to-Ambient, Case 221A | 65 °C/W |
| Thermal Resistance Junction-to-Case, Case 221A | 5.0 °C/W |
| Power Dissipation, Case 936 D2PAK | Internally limited; TA=25°C |
| Thermal Resistance Junction-to-Ambient, Case 936 D2PAK | 70 °C/W |
| Thermal Resistance Junction-to-Case, Case 936 D2PAK | 5.0 °C/W |
| Operating Junction Temperature Range | -40°C to +125°C; Maximum ratings |
| Storage Temperature Range | -65°C to +150°C; Maximum ratings |
| Line Regulation at TA=25°C | typ 0.01 %/V, max 0.04 %/V; 3.0 V <= |VI-VO| <= 40 V |
| Load Regulation at TA=25°C, |VO| <= 5.0 V | typ 15 mV, max 50 mV; 10 mA <= IO <= Imax |
| Load Regulation at TA=25°C, |VO| >= 5.0 V | typ 0.3 %VO, max 1.0 %VO; 10 mA <= IO <= Imax |
| Thermal Regulation | typ 0.003 %VO/W, max 0.04 %VO/W; TA=25°C, 10 ms pulse |
| Adjustment Pin Current | typ 65 µA, max 100 µA; |VI-VO|=5.0 V, IO=0.5 A for T package |
| Adjustment Pin Current Change | typ 2.0 µA, max 5.0 µA; 2.5 V <= |VI-VO| <= 40 V, 10 mA <= IL <= Imax, PD <= Pmax, TA=25°C |
| Reference Voltage at TA=25°C | min -1.213 V, typ -1.250 V, max -1.287 V; 3.0 V <= |VI-VO| <= 40 V, 10 mA <= IO <= Imax, PD <= Pmax |
| Reference Voltage Across Junction Temperature Range | min -1.20 V, typ -1.25 V, max -1.30 V; TJ=Tlow to Thigh, 3.0 V <= |VI-VO| <= 40 V, 10 mA <= IO <= Imax, PD <= Pmax |
| Line Regulation | typ 0.02 %/V, max 0.07 %/V; 3.0 V <= |VI-VO| <= 40 V |
| Load Regulation, |VO| <= 5.0 V | typ 20 mV, max 70 mV; 10 mA <= IO <= Imax |
| Load Regulation, |VO| >= 5.0 V | typ 0.3 %VO, max 1.5 %VO; 10 mA <= IO <= Imax |
| Temperature Stability | typ 0.6 %VO; Tlow <= TJ <= Thigh |
| Minimum Load Current, |VI-VO| <= 10 V | typ 1.5 mA, max 6.0 mA |
| Minimum Load Current, |VI-VO| <= 40 V | typ 2.5 mA, max 10 mA |
| Maximum Output Current, |VI-VO| <= 15 V | typ 1.5 A, max 2.2 A; PD <= Pmax, T package |
| Maximum Output Current, |VI-VO| <= 40 V | typ 0.15 A, max 0.4 A; PD <= Pmax, TJ=25°C, T package |
| RMS Noise | typ 0.003 %VO; TA=25°C, 10 Hz <= f <= 10 kHz |
| Ripple Rejection Without CAdj | typ 60 dB; VO=-10 V, f=120 Hz |
| Ripple Rejection With CAdj | min 66 dB, typ 77 dB; VO=-10 V, f=120 Hz, CAdj=10 µF |
| Long-Term Stability | typ 0.3 %/1000 h, max 1.0 %/1000 h; TJ=Thigh, TA=25°C endpoint measurements |
| Thermal Resistance Junction-to-Case, T Package | typ 4.0 °C/W |
| Recommended Input Capacitor | 1.0 µF tantalum; input bypass capacitor Cin |
| Required Output Capacitor | 1.0 µF tantalum or 10 µF aluminum electrolytic; output capacitance CO required for stability |
| Adjustment Capacitor | 10 µF; improves ripple rejection about 15 dB at 120 Hz in a 10 V application |
| Protection Diode Recommendation | 1N4002; for output voltages exceeding -25 V or CO > 25 µF or CAdj > 10 µF |
| Pin 1 Function | Adjust; package pinout |
| Pin 2 Function | Vin; package pinout, heatsink surface connected to Pin 2 |
| Pin 3 Function | Vout; package pinout |
| Datasheet Status | request_only |
Product Overview
The LM337 is a Texas Instruments adjustable negative voltage regulator for Power_Management designs. Its adjustable output range is -1.2 V to -37 V, and the device has output current capability greater than 1.5 A under general device capability conditions. The input-output voltage differential is rated to 40 Vdc maximum at TA=25°C.
Package options listed for the device are TO-220AB Case 221AB and D2PAK Case 936. Thermal data includes internally limited power dissipation, 65°C/W junction-to-ambient and 5.0°C/W junction-to-case for Case 221A, and 70°C/W junction-to-ambient and 5.0°C/W junction-to-case for Case 936 D2PAK. The T package also lists a typical 4.0°C/W junction-to-case value.
For circuit assembly, the datasheet facts specify a recommended 1.0 µF tantalum input bypass capacitor and a required output capacitor of 1.0 µF tantalum or 10 µF aluminum electrolytic for stability. A 10 µF adjustment capacitor improves ripple rejection by about 15 dB at 120 Hz in a 10 V application, and 1N4002 protection diodes are recommended for specified high-voltage or large-capacitor conditions.
Key Features
- Adjustable negative output from -1.2 V to -37 V
- Output current capability greater than 1.5 A
- 40 Vdc maximum input-output voltage differential at TA=25°C
- Internally limited power dissipation for listed packages
- Reference voltage typically -1.250 V at TA=25°C
- Typical RMS noise is 0.003 %VO
- Ripple rejection reaches typical 77 dB with 10 µF CAdj
- Required output capacitor supports regulator stability
- 1N4002 protection diodes recommended for specified capacitor conditions
- Operating junction temperature range is -40°C to +125°C
Typical Applications
- Adjustable negative voltage rails
- Negative regulated power outputs
- TO-220AB regulator assemblies
- D2PAK regulator assemblies
- 120 Hz ripple rejection circuits
- Capacitor-stabilized regulator designs
- Systems requiring -1.2 V to -37 V output
Procurement Notes
When requesting a quote for LM337, 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 output voltage range does the LM337 support?
The LM337 is specified as an adjustable negative voltage regulator with an output voltage range from -1.2 V to -37 V under the general device capability facts.
What output current capability is listed for the LM337?
The extracted facts list general output current capability greater than 1.5 A. A T-package condition also lists maximum output current as typical 1.5 A and max 2.2 A when |VI-VO| <= 15 V and PD <= Pmax.
What output capacitor is required for LM337 stability?
The LM337 requires output capacitance for stability. The listed options are 1.0 µF tantalum or 10 µF aluminum electrolytic, identified as CO in the extracted datasheet facts.
Which pins are used for adjust, input, and output?
The package pinout lists Pin 1 as Adjust, Pin 2 as Vin, and Pin 3 as Vout. The heatsink surface is connected to Pin 2 according to the extracted pinout facts.
When are protection diodes recommended for the LM337?
The extracted facts recommend 1N4002 protection diodes when output voltages exceed -25 V, when CO is greater than 25 µF, or when CAdj is greater than 10 µF.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 26, 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.