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SN74CBT3251DBQR
Public Unreviewedby Ray
Texas Instruments Signal Switches / Encoders & Decoders / Multiplexers, SSOP-16-150mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN74CBT3251DBQR
Texas Instruments · Signal Switches / Encoders & Decoders / Multiplexers · SSOP-16-150mil
SN74CBT3251DBQR from Texas Instruments, in a SSOP-16-150mil. 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 | B4 | bidirectional | Port B4. One of eight switched I/O ports; connects to A when selected (S2 S1 S0 = 0 1 1) and OE is low. |
| 2 | B3 | bidirectional | Port B3. Switched I/O port selected when S2 S1 S0 = 0 1 0 and OE is low. |
| 3 | B2 | bidirectional | Port B2. Switched I/O port selected when S2 S1 S0 = 0 0 1 and OE is low. |
| 4 | B1 | bidirectional | Port B1. Switched I/O port selected when S2 S1 S0 = 0 0 0 and OE is low. |
| 5 | A | bidirectional | Common OUT/IN. Shared terminal of the 1-of-8 FET switch; connects to whichever Bn port is selected by S0/S1/S2 when OE is low. |
| 6 | NC | unconnected | No internal connection. |
| 7 | OE | input | Output Enable, active low. When low the selected A↔Bn switch is closed; when high all switches are disconnected (high-Z). TTL-compatible input (VIH ≥ 2 V, VIL ≤ 0.8 V). |
| 8 | GND | power_in | Ground reference for the device. |
| 9 | S2 | input | Select bit 2 (MSB) of the 3-bit channel-select input. Together with S1/S0 chooses one of eight B ports (see Table 1). TTL-compatible input. |
| 10 | S1 | input | Select bit 1 of the 3-bit channel-select input. TTL-compatible input. |
| 11 | S0 | input | Select bit 0 (LSB) of the 3-bit channel-select input. TTL-compatible input. |
| 12 | B8 | bidirectional | Port B8. Switched I/O port selected when S2 S1 S0 = 1 1 1 and OE is low. |
| 13 | B7 | bidirectional | Port B7. Switched I/O port selected when S2 S1 S0 = 1 1 0 and OE is low. |
| 14 | B6 | bidirectional | Port B6. Switched I/O port selected when S2 S1 S0 = 1 0 1 and OE is low. |
| 15 | B5 | bidirectional | Port B5. Switched I/O port selected when S2 S1 S0 = 1 0 0 and OE is low. |
| 16 | VCC | power_in | Supply voltage input, 4.0-5.5 V recommended (7 V absolute max). Powers the control logic; the FET switches themselves pass signals from 0 V to VCC. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-150mil |
| Category | Logic |
| Pins | 16 |
Ordering variants
Same part, different packaging or reel option.
SN74CBT3251DBQRSN74CBT3251DBQRDSN74CBT3251DBQRDRSN74CBT3251DBQRDBRSN74CBT3251DBQRPWSN74CBT3251DBQRPWRSN74CBT3251DBQRRGYSN74CBT3251DBQRRGYR
CAD (KiCad official)
- Symbol:
SN74CBT3251DBQR - Footprint:
Package_SO:SSOP-16_5.3x6.2mm_P0.65mm - 3D model: SSOP-16-150mil (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (30 pp, sha256
0284abee7e48eb34, 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).