# LM4040D20IDCKR

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

LM4040D20IDCKR 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 | output | General-purpose anode pin, normally connected to ground, and the return terminal of the shunt reference. |
| 2 | * | input | 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 | bidirectional | Parallel current/voltage input at the cathode, which must be supplied with at least IZ,min to regulate; absolute maximum continuous cathode current is 25 mA (-10 mA minimum), and the recommended maximum is 15 mA. |
| 4 | NC | unconnected | No internal connection; the pin is not connected inside the device. |
| 5 | NC | unconnected | No internal connection; the pin is not connected inside the device. |

## 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 (25°C) | ΔVZ | -20 |  | 20 | mV | IZ = 100μA, 25°C | 7 |
| Reverse breakdown voltage tolerance (full range) | ΔVZ | -40 |  | 40 | mV | IZ = 100μA, 完整范围 | 7 |
| Minimum cathode current | IZ,min |  | 45 | 75 | μA | 25°C | 7 |
| Minimum cathode current (full range) | IZ,min |  |  | 80 | μA | 完整范围 | 7 |
| Average temperature coefficient of VZ | αVZ | -20 |  | 20 | ppm/°C | IZ = 10mA, 25°C | 7 |
| Average temperature coefficient of VZ | αVZ | -15 |  | 15 | ppm/°C | IZ = 1mA, 25°C | 7 |
| Average temperature coefficient of VZ | αVZ | -150 |  | 150 | ppm/°C | 完整范围 | 7 |
| Change in VZ with cathode current | VZ |  | 0.3 | 1 | mV | IZ,min < IZ < 1mA, 25°C | 7 |
| Change in VZ with cathode current (full range) | VZ |  |  | 1.2 | mV | IZ,min < IZ < 1mA, 完整范围 | 7 |
| Change in VZ with cathode current | VZ |  | 2.5 | 8 | mV | 1mA < IZ < 15mA, 25°C | 7 |
| Change in VZ with cathode current (full range) | VZ |  |  | 10 | mV | 1mA < IZ < 15mA, 完整范围 | 7 |
| Reverse dynamic impedance | ZZ |  | 0.3 | 1.1 | Ω | IZ = 1mA, f = 120Hz, IAC = 0.1IZ, 25°C | 7 |
| Continuous cathode current | IZ | -10 |  | 25 | mA |  | 5 |
| Operating junction temperature | TJ |  |  | 150 | °C |  | 5 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 5 |
| Cathode current | IZ |  |  | 15 | mA |  | 5 |
| Natural-ventilation operating temperature (LM4040xxxI) | TA | -40 |  | 85 | °C | LM4040xxxI | 5 |
| Junction-to-ambient thermal resistance (DCK, 5-pin) | RθJA |  | 252 |  | °C/W |  | 5 |

## CAD (KiCad official)

- Symbol: `LM4040D20IDCKR`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SC-70-5 (KiCad packages3D, STEP)
- 3D model files: `lm4040d20idckr-etched.step` / `lm4040d20idckr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4040d20idckr.step` / `lm4040d20idckr.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/lm4040d20idckr-datasheet.pdf)