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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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm337lmx.step/lm337lmx.glbare 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).
# 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](https://www.ti.com/cn/lit/gpn/lm337l) (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](docs/lm337lmx-datasheet.pdf)