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BQ2018SN-E1TR

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Texas Instruments Battery Management, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BQ2018SN-E1TR

Texas Instruments · Battery Management · SOIC-8

BQ2018SN-E1TR from Texas Instruments, in a SOIC-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 REG output Output of the OTA that drives an external pass n-channel JFET to provide an optional supply regulated at 3.7V nominal.
2 VCC power_in Supply voltage input, 3.7V ±200mV when regulated by the REG output, or 2.8V to 5.5V valid operating range when REG is not used.
3 VSS power_in Ground.
4 HDQ bidirectional Open-drain bi-directional data input/output to the host, requiring a pullup/down resistor in the battery pack to disable/enable sleep mode if the pack is removed from the system.
5 RBI power_in Register backup input that maintains the internal register states while VCC is below the minimum operating voltage.
6 SR2 input Current sense input connecting to the sense resistor and the negative terminal of the pack, with a valid input range of ±200mV.
7 SR1 input Current sense input connecting to the sense resistor and the negative terminal of the battery, with a valid input range of ±200mV (VSR1 < VSR2 indicates discharge, VSR1 > VSR2 indicates charge).
8 WAKE output Wake-up output asserted (low) to indicate charge or discharge activity above a programmed minimal level, and High Z when below that level.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Power Management (PMIC)
Pins 8

CAD (KiCad official)

  • Symbol: BQ2018SN-E1TR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: bq2018sn-e1tr-etched.step / bq2018sn-e1tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bq2018sn-e1tr.step / bq2018sn-e1tr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (31 pp, sha256 f4821fba7e5475f5, 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