component
CD40257BM
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads on click. Unloads only if this page sits in the background.
PCB Footprint
Open full view ↗Loads on click. Unloads only if this page sits in the background.
Datasheet
Open in new tab ↗Loads on click. Unloads only if this page sits in the background.
README
markdownCD40257BM
Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16
CD40257BM from Texas Instruments, in a SOIC-16. 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 | INPUT SELECT | input | Select input: low passes the A inputs to the outputs, high passes the B inputs. |
| 2 | A1 | input | Channel 1 data input A, routed to D1 when select is low. |
| 3 | B1 | input | Channel 1 data input B, routed to D1 when select is high. |
| 4 | D1 | tri_state | Channel 1 three-state output, high impedance when output disable is high. |
| 5 | A2 | input | Channel 2 data input A, routed to D2 when select is low. |
| 6 | B2 | input | Channel 2 data input B, routed to D2 when select is high. |
| 7 | D2 | tri_state | Channel 2 three-state output, high impedance when output disable is high. |
| 8 | VSS | power_in | Ground (negative supply) reference terminal for all voltages. |
| 9 | D3 | tri_state | Channel 3 three-state output, high impedance when output disable is high. |
| 10 | B3 | input | Channel 3 data input B, routed to D3 when select is high. |
| 11 | A3 | input | Channel 3 data input A, routed to D3 when select is low. |
| 12 | D4 | tri_state | Channel 4 three-state output, high impedance when output disable is high. |
| 13 | B4 | input | Channel 4 data input B, routed to D4 when select is high. |
| 14 | A4 | input | Channel 4 data input A, routed to D4 when select is low. |
| 15 | OUTPUT DISABLE | input | 3-state output disable: high puts all outputs in high impedance, low enables them. |
| 16 | VDD | power_in | Positive supply, recommended 3 V to 18 V, absolute maximum -0.5 V to +20 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
CD40257BM - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
cd40257bm-etched.step/cd40257bm-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd40257bm.step/cd40257bm.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (10 pp, sha256
d9965b2fa9121640, retrieved 2026-10-05, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).