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TMP421AIDCNR

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Texas Instruments Temperature and Humidity Sensor, SOT-23-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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TMP421AIDCNR

Texas Instruments · Temperature and Humidity Sensor · SOT-23-8

TMP421AIDCNR from Texas Instruments, in a SOT-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 DXP input Positive connection to the external remote temperature-sensing diode/transistor. Sources bias current (up to 120 µA) into the remote junction for temperature measurement.
2 DXN input Negative connection to the external remote temperature-sensing diode/transistor. Return path for the remote-sensor bias current.
3 A1 input Address-select pin. Tie to GND, V+, SDA, or SCL to set the SMBus slave address (7-bit address prefix 100 11xx per Package Information table).
4 A0 input Address-select pin. Tie to GND, V+, SDA, or SCL to set the SMBus slave address (7-bit address prefix 100 11xx per Package Information table).
5 GND power_in Ground reference for the device (0 V).
6 SDA bidirectional SMBus/I²C serial data line, open-drain. Requires an external pull-up resistor to V+. Supports clock frequencies up to 3.4 MHz.
7 SCL input SMBus/I²C serial clock line, open-drain. Requires an external pull-up resistor to V+.
8 V+ power_in Positive supply voltage input, 2.7 V to 5.5 V for TMP421 (2.55 V to 5.5 V for TMP421C). Decouple locally to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • TMP421AIDCNR
  • TMP421AIDCNT
  • TMP421AIDCNRCYZDR
  • TMP421AIDCNRCYZDT

CAD (KiCad official)

  • Symbol: TMP421AIDCNR
  • Footprint: Package_TO_SOT_SMD:SOT-23-8
  • 3D model: SOT-23-8 (KiCad packages3D, STEP)
  • 3D model files: tmp421aidcnr-etched.step / tmp421aidcnr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tmp421aidcnr.step / tmp421aidcnr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 9767344d67270d4c, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF