# LM4040A25IDCKR

**Texas Instruments** · Voltage Reference · SC-70-5

LM4040A25IDCKR from Texas Instruments, in a SC-70-5. 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 | ANODE | passive | General-purpose pin, typically grounded, and the reference terminal of the shunt regulator (the cathode-to-anode voltage is the regulated VZ). |
| 2 | * | passive | Must be left floating or connected to the anode; TI recommends connecting it to the anode in applications with high EMI or significant high-frequency switching noise. |
| 3 | CATHODE | passive | Parallel current/voltage input; the cathode current IZ must be kept within the recommended range of 15 mA maximum, and the absolute maximum continuous cathode current is -10 mA to 25 mA. |
| 4 | NC | unconnected | No internal connection. |
| 5 | NC | unconnected | No internal connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SC-70-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse breakdown voltage tolerance (ΔVZ), 25°C | ΔVZ | -2.5 |  | 2.5 | mV | IZ = 100μA, TA = 25°C | 9 |
| Reverse breakdown voltage tolerance (ΔVZ), full range | ΔVZ | -19 |  | 19 | mV | IZ = 100μA, TA = full range (-40°C to 85°C) | 9 |
| Minimum cathode current | IZ,min | 45 | 75 |  | μA | TA = 25°C | 9 |
| Minimum cathode current, full range | IZ,min |  |  | 80 | μA | TA = full range (-40°C to 85°C) | 9 |
| Average temperature coefficient of VZ, IZ = 10mA | αVZ | -20 |  | 20 | ppm/°C | IZ = 10mA, TA = 25°C | 9 |
| Average temperature coefficient of VZ, IZ = 1mA | αVZ | -15 |  | 15 | ppm/°C | IZ = 1mA, TA = 25°C | 9 |
| Average temperature coefficient of VZ, full range | αVZ | -100 |  | 100 | ppm/°C | TA = full range (-40°C to 85°C) | 9 |
| Average temperature coefficient of VZ, IZ = 100μA | αVZ | -15 |  | 15 | ppm/°C | IZ = 100μA, TA = 25°C | 9 |
| Change in VZ with cathode current, IZ,min < IZ < 1mA, 25°C | ΔVZ/ΔIZ |  | 0.3 | 0.8 | mV | IZ,min < IZ < 1mA, TA = 25°C | 9 |
| Change in VZ with cathode current, IZ,min < IZ < 1mA, full range | ΔVZ/ΔIZ |  |  | 1 | mV | IZ,min < IZ < 1mA, TA = full range (-40°C to 85°C) | 9 |
| Change in VZ with cathode current, 1mA < IZ < 15mA, 25°C | ΔVZ/ΔIZ |  | 2.5 | 6 | mV | 1mA < IZ < 15mA, TA = 25°C | 9 |
| Change in VZ with cathode current, 1mA < IZ < 15mA, full range | ΔVZ/ΔIZ |  |  | 8 | mV | 1mA < IZ < 15mA, TA = full range (-40°C to 85°C) | 9 |
| Reverse dynamic impedance | ZZ |  | 0.3 | 0.8 | Ω | IZ = 1mA, f = 120Hz, IAC = 0.1IZ, TA = 25°C | 9 |
| Continuous cathode current | IZ | -10 |  | 25 | mA |  | 5 |
| Operating virtual junction temperature | TJ |  |  | 150 | °C |  | 5 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 5 |
| Cathode current | IZ |  |  | 15 | mA |  | 5 |
| Free-air operating temperature, LM4040xxxI | TA | -40 |  | 85 | °C | LM4040xxxI (industrial grade) | 5 |
| Junction-to-ambient thermal resistance, DCK (5-pin SC70) | RθJA |  | 252 |  | °C/W | DCK 5-pin package | 5 |

## CAD (KiCad official)

- Symbol: `LM4040A25IDCKR`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SC-70-5 (KiCad packages3D, STEP)
- 3D model files: `lm4040a25idckr-etched.step` / `lm4040a25idckr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4040a25idckr.step` / `lm4040a25idckr.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/lm4040) (62 pp, sha256 `68faec55d71e5cd5`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm4040a25idckr-datasheet.pdf)