# AMC6821SDBQR

**Texas Instruments** · Temperature Sensors · SSOP-16-150mil

AMC6821SDBQR from Texas Instruments, in a SSOP-16-150mil. 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 | PWM-OUT | output | Digital open-drain output that provides the PWM signal used to control fan speed. |
| 2 | TACH | input | Digital input that receives the fan tachometer signal used to measure fan speed. |
| 3 | OVR | output | Digital open-drain output that goes active low when the temperature reaches the critical shutdown threshold or the remote temperature sensor fails. |
| 4 | NC | unconnected | Not connected; reserved for manufacturer testing. |
| 5 | GND | power_in | System ground. |
| 6 | VDD | power_in | Power supply input, +3 V to +5 V per Table 1 (electrical characteristics specify an operating range of 2.7 V to 5.5 V). |
| 7 | THERM | bidirectional | Open-drain fail-safe I/O: as an output it goes active low when the temperature exceeds the THERM limit, and as an input a low level sets THERM-IN and drives the fan to full speed. |
| 8 | FAN-FAULT | output | Digital open-drain output that goes low when a fan failure is detected. |
| 9 | IN- | passive | Negative analog differential input connected to the cathode of the external temperature-sensing diode. |
| 10 | IN+ | passive | Positive analog differential input connected to the anode of the external temperature-sensing diode (Pentium-IV substrate transistor or 2N3904-type transistor). |
| 11 | PWM-MODE | input | PWM frequency range select, checked only at power-up or reset: tied low selects 1 kHz to 40 kHz, while tie to VDD or float selects 10 Hz to 94 Hz. |
| 12 | A1 | input | Device slave address select pin, checked only at power-up or reset. |
| 13 | A0 | input | Device slave address select pin, checked only at power-up or reset. |
| 14 | SMBALERT | output | Programmable open-drain SMBALERT output, active low, requiring a pull-up resistor (2.2 kΩ typical). |
| 15 | SDA | bidirectional | SMBus bidirectional open-drain data pin, requiring a pull-up resistor (2.2 kΩ typical). |
| 16 | SCLK | input | SMBus clock digital input, requiring a pull-up resistor (2.2 kΩ typical). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-150mil |
| Category | Sensors |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `AMC6821SDBQR`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-150mil (KiCad packages3D, STEP)
- 3D model files: `amc6821sdbqr-etched.step` / `amc6821sdbqr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `amc6821sdbqr.step` / `amc6821sdbqr.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/amc6821) (57 pp, sha256 `5d9e1c7763cc3c8b`, retrieved 2026-10-08, tier: lcsc)
- **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/amc6821sdbqr-datasheet.pdf)