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BL1551B

Public Made by Adom

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BL Shanghai Belling Analog Switches, Multiplexers, SC-70-6. 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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BL1551B

BL Shanghai Belling · Analog Switches, Multiplexers · SC-70-6

BL1551B from BL Shanghai Belling, in a SC-70-6. 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 A1 bidirectional Analog switch throw terminal 1. Bidirectional data port; connected to common terminal B when ENB is HIGH. Signal range 0V to VCC; RON ~2.7Ω at VCC=5V.
2 GND power_in Ground return for the device.
3 A2 bidirectional Analog switch throw terminal 2. Bidirectional data port; connected to common terminal B when ENB is LOW. Signal range 0V to VCC; RON ~2.7Ω at VCC=5V.
4 B bidirectional Analog switch common (pole) terminal. Bidirectional data port routed to either A1 or A2 under control of ENB. Signal range 0V to VCC.
5 VCC power_in Positive supply input, 1.8V to 5.5V operating range (6V absolute max). Bypass with a 0.1µF capacitor to GND.
6 ENB input Digital logic control input selecting the switch position. ENB=HIGH connects A1 to B; ENB=LOW connects A2 to B. TTL/CMOS compatible (VIH ≥ 1.5V, VIL ≤ 0.6V at VCC=5V). Must not be left floating.

Key specifications

Parameter Value
Manufacturer BL Shanghai Belling
Package SC-70-6
Category Interface
Pins 6

Ordering variants

  • BL1551B

CAD (KiCad official)

  • Symbol: BL1551B
  • Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
  • 3D model: SC-70-6 (KiCad packages3D, STEP)
  • 3D model files: bl1551b-etched.step / bl1551b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl1551b.step / bl1551b.glb are the bare package body.

Provenance

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

  • Datasheet: BL Shanghai Belling datasheet (10 pp, sha256 e066dbc07f7b36a0, retrieved 2026-08-17, tier: lcsc)
  • 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