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SN74LVC646ADBR

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-24-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LVC646ADBR

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SSOP-24-150mil

SN74LVC646ADBR from Texas Instruments, in a SSOP-24-150mil. 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 CLKAB input Clock input for the A-side registers; data on the A bus is stored on each low-to-high transition of CLKAB.
2 SAB input Select control for the A-to-B path that multiplexes stored and real-time (transparent) data.
3 DIR input Direction control that sets which bus receives data when OE is low (low selects B to A, high selects A to B).
4 A1 bidirectional A-bus port 1 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
5 A2 bidirectional A-bus port 2 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
6 A3 bidirectional A-bus port 3 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
7 A4 bidirectional A-bus port 4 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
8 A5 bidirectional A-bus port 5 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
9 A6 bidirectional A-bus port 6 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
10 A7 bidirectional A-bus port 7 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
11 A8 bidirectional A-bus port 8 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
12 GND power_in Ground reference; all unused inputs must be held at VCC or GND for proper device operation.
13 B8 bidirectional B-bus port 8 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
14 B7 bidirectional B-bus port 7 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
15 B6 bidirectional B-bus port 6 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
16 B5 bidirectional B-bus port 5 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
17 B4 bidirectional B-bus port 4 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
18 B3 bidirectional B-bus port 3 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
19 B2 bidirectional B-bus port 2 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
20 B1 bidirectional B-bus port 1 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V.
21 OE input Active-low output enable; OE high places the A and B outputs in the high-impedance (isolation) state, and it should be tied to VCC through a pullup resistor to keep outputs high-impedance during power up or down.
22 SBA input Select control for the B-to-A path that multiplexes stored and real-time (transparent) data.
23 CLKBA input Clock input for the B-side registers; data on the B bus is stored on each low-to-high transition of CLKBA.
24 VCC power_in Supply voltage; the SN74LVC646A is specified for 1.65 V to 3.6 V operation (operating range).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SSOP-24-150mil
Category Logic
Pins 24

CAD (KiCad official)

  • Symbol: SN74LVC646ADBR
  • Footprint: Package_SO:SSOP-24_5.3x8.2mm_P0.65mm
  • 3D model: SSOP-24-150mil (KiCad packages3D, STEP)
  • 3D model files: sn74lvc646adbr-etched.step / sn74lvc646adbr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74lvc646adbr.step / sn74lvc646adbr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (21 pp, sha256 979e7f444477033e, retrieved 2026-10-11, 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