# LM74502DDFR

**Texas Instruments** · Power Distribution Switches · TSOT-23-8

LM74502DDFR from Texas Instruments, in a TSOT-23-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | EN/UVLO | input | Enable/UVLO input; voltage above 1.24V (typical rising threshold) enables gate driver and charge pump; pulling below 0.64V (typical) enters low-IQ shutdown mode drawing 1µA. |
| 2 | GND | power_in | Ground reference pin. |
| 3 | N.C | unconnected | No connection pin. |
| 4 | VCAP | output | Charge pump output for external gate drive; connect 0.1-0.22µF external capacitor; provides approximately 13V above VS with hysteresis between 11.6V and 12.4V. |
| 5 | VS | power_in | Input power supply to controller; operates 3.2V to 65V with 3.9V power-on-reset rising threshold and -65V reverse voltage withstanding; requires 100nF bypass capacitor to GND. |
| 6 | GATE | output | Gate drive output for external N-channel MOSFET; 60µA peak source current (LM74502) or 11mA (LM74502H), 2.37A peak sink current, 0-15V gate-to-source voltage rating. |
| 7 | OV | input | Overvoltage protection threshold input; connect resistor divider from input supply to OV to ground to set threshold; rising comparator reference 1.25V, falling reference 1.14V. |
| 8 | SRC | input | Source reference point for external back-to-back N-channel MOSFETs or high-side MOSFET source; withstands -65V to +65V voltage excursions for reverse polarity protection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSOT-23-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM74502DDFR`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-8`
- 3D model: TSOT-23-8 (KiCad packages3D, STEP)
- 3D model files: `lm74502ddfr-etched.step` / `lm74502ddfr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm74502ddfr.step` / `lm74502ddfr.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/ds/symlink/lm74502.pdf) (30 pp, sha256 `32a78dac63f4406b`, retrieved 2026-09-18, 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 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/lm74502ddfr-datasheet.pdf)