# LM4040B50IDCKR

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

LM4040B50IDCKR 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 | Common pin, typically connected to ground, and the reference terminal against which the cathode voltage is set; the datasheet gives no separate electrical limits for it. |
| 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 | Shunt current/voltage input; the cathode current IZ must stay within 15 mA recommended maximum (25 mA absolute maximum continuous, -10 mA minimum) and at or above IZ,min for regulation. |
| 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 (25°C), B grade | ΔVZ | -10 |  | 10 | mV | IZ = 100μA, 25°C | 17 |
| Reverse breakdown voltage tolerance (full range), B grade | ΔVZ | -43 |  | 43 | mV | IZ = 100μA, full range TA = –40°C to 85°C | 17 |
| Average temperature coefficient of VZ | αVZ | -30 |  | 30 | ppm/°C | IZ = 10mA, 25°C | 17 |
| Average temperature coefficient of VZ | αVZ | -20 |  | 20 | ppm/°C | IZ = 1mA, 25°C | 17 |
| Average temperature coefficient of VZ | αVZ | -100 |  | 100 | ppm/°C | full range TA = –40°C to 85°C | 17 |
| Minimum cathode current | IZ,min |  | 65 | 89 | μA | 25°C | 17 |
| Minimum cathode current | IZ,min |  |  | 95 | μA | full range TA = –40°C to 85°C | 17 |
| Reverse breakdown voltage change with cathode current | VZ |  | 0.5 | 1 | mV | IZ,min < IZ < 1mA, 25°C | 17 |
| Reverse breakdown voltage change with cathode current | VZ |  |  | 1.4 | mV | IZ,min < IZ < 1mA, full range TA = –40°C to 85°C | 17 |
| Reverse breakdown voltage change with cathode current | VZ |  | 3.5 | 8 | mV | 1mA < IZ < 15mA, 25°C | 17 |
| Reverse breakdown voltage change with cathode current | VZ |  |  | 12 | mV | 1mA < IZ < 15mA, full range TA = –40°C to 85°C | 17 |
| Reverse dynamic impedance | ZZ |  | 0.5 | 1.1 | Ω | IZ = 1mA, f = 120Hz, IAC = 0.1IZ, 25°C | 17 |
| Reverse breakdown voltage | VZ |  | 5 |  | V | IZ = 100μA, 25°C | 17 |
| Wideband noise | eN |  | 80 |  | μVRMS | IZ = 100μA, 10Hz ≤ f ≤ 10kHz, 25°C | 17 |
| Long-term stability of reverse breakdown voltage |  |  | 120 |  | ppm | t = 1000 h, TA = 25°C ± 0.1°C, IZ = 100μA | 17 |
| Thermal hysteresis | VHYST |  | 0.08 |  | % | ΔTA = –40°C to 125°C | 17 |
| 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 |
| Ambient temperature, LM4040xxxI | TA | -40 |  | 85 | °C | LM4040xxxI | 5 |
| Junction-to-ambient thermal resistance | RθJA |  | 252 |  | °C/W | DCK (5-pin) package | 5 |

## CAD (KiCad official)

- Symbol: `LM4040B50IDCKR`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SC-70-5 (KiCad packages3D, STEP)
- 3D model files: `lm4040b50idckr-etched.step` / `lm4040b50idckr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4040b50idckr.step` / `lm4040b50idckr.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 2026-10-09, 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/lm4040b50idckr-datasheet.pdf)