# LM4140ACM-4.1

**Texas Instruments** · Voltage References · SOIC-8

LM4140ACM-4.1 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 | Ground | power_in | Negative supply or ground connection that must be connected to ground. |
| 2 | VIN | power_in | Positive supply input for the reference. |
| 3 | Enable | input | Pulled to input for normal operation, and forcing this pin to ground turns off the output. |
| 4 | Ground | power_in | Negative supply or ground connection that must be connected to ground. |
| 5 | NC | unconnected | This pin must be left open. |
| 6 | VREF | power_in | Reference output capable of sourcing up to 8 mA. |
| 7 | Ground | power_in | Negative supply or ground connection that must be connected to ground. |
| 8 | Ground | power_in | Negative supply or ground connection that must be connected to ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum voltage on any input pin |  | -0.3 |  | 5.6 | V |  | 4 |
| Power dissipation |  |  |  | 345 | mW | TA = 25°C | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Ambient temperature |  | 0 |  | 70 | °C |  | 4 |
| Junction temperature |  | 0 |  | 80 | °C |  | 4 |
| Output voltage initial accuracy | VREF | -0.1 |  | 0.1 | % | All versions | 5 |
| Temperature coefficient A grade | TCVREF/°C |  |  | 3 | ppm/°C | 0°C ≤ TA ≤ 70°C, A grade | 5 |
| Line regulation (Vref + 200 mV ≤ VIN ≤ 5.5 V) | ΔVREF/ΔVIN |  | 20 | 200 | ppm/V | All other voltage options, TA = 25°C | 5 |
| Line regulation (Vref + 200 mV ≤ VIN ≤ 5.5 V) | ΔVREF/ΔVIN |  |  | 250 | ppm/V | All other voltage options, 0°C ≤ TA ≤ 70°C | 5 |
| Load regulation (1 mA ≤ ILOAD ≤ 8 mA) | ΔVREF/ΔILOAD |  | 1 | 20 | ppm/mA | All other voltage options, TA = 25°C | 5 |
| Load regulation (1 mA ≤ ILOAD ≤ 8 mA) | ΔVREF/ΔILOAD |  |  | 150 | ppm/mA | All other voltage options, 0°C ≤ TA ≤ 70°C | 5 |
| Long-term stability | ΔVREF |  |  | 60 | ppm | 1000 hours | 5 |
| Thermal hysteresis | ΔVREF |  |  | 20 | ppm | 0°C ≤ TA ≤ +70°C | 5 |
| Supply current | IS(ON) |  | 230 | 320 | µA | ILOAD = 0 mA, All other voltage options, TA = 25°C | 5 |
| Supply current | IS(ON) |  |  | 375 | µA | ILOAD = 0 mA, All other voltage options, 0°C ≤ TA ≤ 70°C | 5 |
| Supply current (shutdown) | IS(OFF) |  | 0.01 |  | µA | VEnable < 0.4 V, TA = 25°C | 5 |
| Supply current (shutdown) | IS(OFF) |  |  | 1 | µA | VEnable < 0.4 V, 0°C ≤ TA ≤ 70°C | 5 |
| Logic high input voltage | VH | 0.8 |  |  | × VIN V | 0°C ≤ TA ≤ 70°C | 5 |
| Logic high input current | IH |  |  | 2 | nA |  | 5 |
| Logic low input voltage | VL |  |  | 0.4 | V | 0°C ≤ TA ≤ 70°C | 5 |
| Logic low input current | IL |  |  | 1 | nA |  | 5 |
| Short-circuit current | ISC | 8.5 | 20 | 35 | mA | TA = 25°C | 5 |
| Short-circuit current | ISC |  |  | 40 | mA | 0°C ≤ TA ≤ 70°C | 5 |
| Junction-to-ambient thermal resistance | RθJA |  | 119.3 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 52.3 |  | °C/W |  | 4 |
| Junction-to-board thermal resistance | RθJB |  | 60.3 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `LM4140ACM-4.1`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm4140acm-4-1-etched.step` / `lm4140acm-4-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4140acm-4-1.step` / `lm4140acm-4-1.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/lit/ds/symlink/lm4140.pdf) (33 pp, sha256 `18565fb048b1515d`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/lm4140acm-4-1-datasheet.pdf)