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LM337LMX

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Texas Instruments Linear Voltage Regulators (LDO), SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM337LMX

Texas Instruments · Linear Voltage Regulators (LDO) · SOIC-8

LM337LMX from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VOUT power_out Output voltage pin for the regulator, adjustable over -1.2 V to -37 V with up to 100 mA output current.
2 VIN power_in Input voltage pin for the regulator; maximum input-output differential is 40 V.
3 VIN power_in Input voltage pin for the regulator; maximum input-output differential is 40 V, connected to the same input as pins 2, 6 and 7.
4 ADJ input Adjust pin that sets the output voltage via an external resistor divider, with the reference typically 1.25 V from VOUT.
5 NC unconnected No connection.
6 VIN power_in Input voltage pin for the regulator; maximum input-output differential is 40 V, connected to the same input as pins 2, 3 and 7.
7 VIN power_in Input voltage pin for the regulator; maximum input-output differential is 40 V, connected to the same input as pins 2, 3 and 6.
8 NC unconnected No connection.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Power Supply Chip
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input-output voltage differential 40 V 3
Storage temperature Tstg -55 150 °C 3
Electrostatic discharge, human-body model V(ESD) -1500 1500 V HBM, per ANSI/ESDA/JEDEC JS-001 3
Operating junction temperature -25 125 °C over operating free-air temperature range 3
Junction-to-ambient thermal resistance RθJA 111.3 °C/W D (SOIC) 8 pins 4
Junction-to-case (top) thermal resistance RθJC(top) 56.1 °C/W D (SOIC) 8 pins 4
Junction-to-board thermal resistance RθJB 51.9 °C/W D (SOIC) 8 pins 4
Junction-to-top characterization parameter ψJT 10.6 °C/W D (SOIC) 8 pins 4
Junction-to-board characterization parameter ψJB 51.3 °C/W D (SOIC) 8 pins 4
Line regulation 0.01 0.04 %/V TA = 25°C, 3 V ≤ /VIN, VOUT/ ≤ 40 V 4
Load regulation 0.1 0.5 % TA = 25°C, 5 mA ≤ IOUT ≤ IMAX 4
Thermal regulation 0.04 0.2 %/W TA = 25°C, 10-ms Pulse 4
Adjustment pin current 50 100 μA 4
Adjustment pin current change 0.2 5 μA 5 mA ≤ IL ≤ 100 mA, 3 V ≤ /VIN, VOUT/ ≤ 40 V 4
Reference voltage 1.2 1.25 1.3 V 3 V ≤ /VIN, VOUT/ ≤ 40 V, 10 mA ≤ IOUT ≤ 100 mA, P ≤ 625 mW 4
Line regulation 0.02 0.07 %/V 3 V ≤ /VIN, VOUT/ ≤ 40 V 4
Load regulation 0.3 1.5 % 5 mA ≤ IOUT ≤ 100 mA 4
Temperature stability 0.65 % TMIN ≤ Tj ≤ TMAX 4
Minimum load current 3.5 5 mA /VIN, VOUT/ ≤ 40 V 4
Minimum load current 2.2 3.5 mA 3 V ≤ /VIN, VOUT/ ≤ 15 V 4
Current limit 100 200 320 mA 3 V ≤ /VIN, VOUT/ ≤ 13 V 4
Current limit 25 50 120 mA /VIN, VOUT/ = 40 V 4
RMS output noise, % of VOUT 0.003 % TA = 25°C, 10 Hz ≤ f ≤ 10 kHz 4
Ripple rejection ratio 65 dB VOUT = -10 V, F = 120 Hz, CADJ = 0 4
Ripple rejection ratio 66 80 dB CADJ = 10 μF 4
Long-term stability 0.3 1 % TA = 125°C 4

CAD (KiCad official)

  • Symbol: LM337LMX
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: lm337lmx-etched.step / lm337lmx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm337lmx.step / lm337lmx.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (20 pp, sha256 34f0e766db831d4b, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF