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TMP421AIDCNT

Public Made by Adom

by adom

Texas Instruments Temperature Sensors, SOT-23-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TMP421AIDCNT

Texas Instruments · Temperature Sensors · SOT-23-8

TMP421AIDCNT from Texas Instruments, in a SOT-23-8. 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 DXP passive Positive connection to remote temperature sensor, accepts diode-connected transistor input for remote temperature measurement range -40°C to +150°C.
2 DXN passive Negative connection to remote temperature sensor, requires less than 5Ω effective series resistance and 100pF differential input capacitance.
3 A1 input Address pin with input logic levels VIH = 0.7(V+) to (V+)+0.5V and VIL = -0.5V to 0.3(V+).
4 A0 input Address pin with input logic levels VIH = 0.7(V+) to (V+)+0.5V and VIL = -0.5V to 0.3(V+).
5 GND power_in Ground connection, reference potential for device.
6 SDA bidirectional Serial data line for SMBus two-wire interface, open-drain output requiring pull-up resistor to V+, input threshold VIH = 2.1V and VIL = 0.8V.
7 SCL bidirectional Serial clock line for SMBus two-wire interface, open-drain output requiring pull-up resistor to V+, input threshold VIH = 2.1V and VIL = 0.8V.
8 V+ power_in Positive supply voltage 2.7V to 5.5V for TMP421 (2.55V to 5.5V for TMP421C), with quiescent current 32-38µA at 0.0625 conversions per second.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23-8
Category Sensors
Pins 8

CAD (KiCad official)

  • Symbol: TMP421AIDCNT
  • Footprint: Package_TO_SOT_SMD:SOT-23-8
  • 3D model: SOT-23-8 (KiCad packages3D, STEP)
  • 3D model files: tmp421aidcnt-etched.step / tmp421aidcnt-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tmp421aidcnt.step / tmp421aidcnt.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (36 pp, sha256 a8969604cee2986f, retrieved 2026-10-05, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-4-5-20251001 (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