Specifications
| Type | Description |
|---|---|
| Part Number | SN74CB3Q3257_Bus-Switch |
| Manufacturer | Texas Instruments |
| Product Type | Multiplexer |
| Category | Logic |
| Package/Case | TVSOP (DGV, 16) 3.6mm x 6.4mm; SSOP (DBQ, 16) 4.9mm x 6mm; TSSOP (PW, 16) 5mm x 6.4mm; VQFN (RGV/RGY, 16) 4mm x 3.5mm |
| Function | 4-bit 1-of-2 FET multiplexer and demultiplexer bus switch |
| Data Path Bandwidth | up to 500 MHz |
| Typical On-State Resistance | 4 ohm typ |
| Supply Voltage Range | 2.3 V to 3.6 V |
| Data I/O Voltage Range | 0 V to 5.5 V |
| High-Level Control Input Voltage | 1.7 V to 5.5 V; VCC = 2.3 V to 2.7 V |
| High-Level Control Input Voltage | 2 V to 5.5 V; VCC = 2.7 V to 3.6 V |
| Low-Level Control Input Voltage | 0 V to 0.7 V; VCC = 2.3 V to 2.7 V |
| Low-Level Control Input Voltage | 0 V to 0.8 V; VCC = 2.7 V to 3.6 V |
| Operating Free-Air Temperature | -40 C to 105 C |
| Storage Temperature | -65 C to 150 C |
| Absolute Maximum Supply Voltage | -0.5 V to 4.6 V |
| Absolute Maximum Control Input Voltage | -0.5 V to 7 V |
| Absolute Maximum Switch I/O Voltage | -0.5 V to 7 V |
| Control Input Clamp Current | -50 mA; VIN < 0 V |
| I/O Port Clamp Current | -50 mA; VI/O < 0 V |
| On-State Switch Current | +/-64 mA |
| Continuous Current Through VCC or GND | +/-100 mA |
| ESD Rating HBM | +/-2000 V; ANSI/ESDA/JEDEC JS-001; JESD 22 A114-B class II |
| ESD Rating CDM | +/-1000 V; JEDEC JESD22-C101 |
| Control Input Leakage Current | +/-1 uA max; VCC = 3.6 V, VIN = 0 V to 5.5 V |
| Switch OFF Leakage Current | +/-1 uA max; VCC = 3.6 V, VO = 0 V to 5.5 V, VIN = VCC or GND |
| Power-Off Leakage Current | 1 uA max; VCC = 0 V, VO = 0 V to 5.5 V, VI = 0 V |
| Supply Current | 0.7 mA typ, 1.5 mA max; VCC = 3.6 V, switch ON or OFF, II/O = 0, VIN = VCC or GND |
| Delta Supply Current | 30 uA max; VCC = 3.6 V, one control input at 3 V, other inputs at VCC or GND |
| Dynamic Supply Current Per Control Input | 0.3 mA/MHz typ, 0.35 mA/MHz max; VCC = 3.6 V, control input switching at 50% duty cycle, A and B ports open |
| Control Input Capacitance | 2.5 pF typ, 3.5 pF max; VCC = 3.3 V, VIN = 5.5 V, 3.3 V, or 0 V |
| A-Port OFF Capacitance | 5.5 pF typ, 7 pF max; VCC = 3.3 V, switch OFF, VIN = VCC or GND, VI/O = 5.5 V, 3.3 V, or 0 V |
| B-Port OFF Capacitance | 3.5 pF typ, 5 pF max; VCC = 3.3 V, switch OFF, VIN = VCC or GND, VI/O = 5.5 V, 3.3 V, or 0 V |
| A-Port ON Capacitance | 10.5 pF typ, 13 pF max; VCC = 3.3 V, switch ON, VIN = VCC or GND, VI/O = 5.5 V, 3.3 V, or 0 V |
| B-Port ON Capacitance | 10.5 pF typ, 13 pF max; VCC = 3.3 V, switch ON, VIN = VCC or GND, VI/O = 5.5 V, 3.3 V, or 0 V |
| On-State Resistance | 4 ohm typ, 8 ohm max; VCC = 2.3 V, VI = 0 V, IO = 30 mA |
| On-State Resistance | 4 ohm typ, 9 ohm max; VCC = 2.5 V typ, VI = 1.7 V, IO = -15 mA |
| On-State Resistance | 4 ohm typ, 6 ohm max; VCC = 3 V, VI = 0 V, IO = 30 mA |
| On-State Resistance | 4 ohm typ, 8 ohm max; VCC = 3 V, VI = 2.4 V, IO = -15 mA |
| Maximum Control Switching Frequency | 10 MHz max; VCC = 2.5 V +/-0.2 V, OE or S input to A or B output |
| Propagation Delay | 0.12 ns typ, 0.21 ns max; VCC = 2.5 V +/-0.2 V, A or B to B or A |
| Select Propagation Delay | 1.5 ns min, 6.5 ns max at 85 C, 7.5 ns max at 105 C; VCC = 2.5 V +/-0.2 V, S to A |
| Enable Time | 1.5 ns min, 6.5 ns max at 85 C, 7.5 ns max at 105 C; VCC = 2.5 V +/-0.2 V, OE to A or B |
| Disable Time | 1 ns min, 6 ns max at 85 C, 7 ns max at 105 C; VCC = 2.5 V +/-0.2 V, OE to A or B |
| Maximum Control Switching Frequency | 20 MHz max; VCC = 3.3 V +/-0.3 V, OE or S input to A or B output |
| Propagation Delay | 0.2 ns typ, 0.32 ns max; VCC = 3.3 V +/-0.3 V, A or B to B or A |
| Select Propagation Delay | 1.5 ns min, 4.1 ns typ, 5.5 ns max at 85 C, 6.5 ns max at 105 C; VCC = 3.3 V +/-0.3 V, S to A |
| Enable Time | 1.5 ns min, 4.7 ns typ, 5.5 ns max at 85 C, 6.5 ns max at 105 C; VCC = 3.3 V +/-0.3 V, OE to A or B |
| Disable Time | 1 ns min, 3.1 ns typ, 6 ns max at 85 C, 7 ns max at 105 C; VCC = 3.3 V +/-0.3 V, OE to A or B |
| Package Option | TVSOP DGV 16-pin, 3.6mm x 6.4mm |
| Package Option | SSOP DBQ 16-pin, 4.9mm x 6mm |
| Package Option | TSSOP PW 16-pin, 5mm x 6.4mm |
| Package Option | VQFN RGV/RGY 16-pin, 4mm x 3.5mm |
| Thermal Resistance Junction-to-Ambient | 114.3 C/W DGV; 126.0 C/W DBQ; 112.7 C/W PW; 49.1 C/W RGY |
| Thermal Resistance Junction-to-Case Top | 65.4 C/W DGV; 51.3 C/W DBQ; 47.5 C/W PW; 61.2 C/W RGY |
| Thermal Resistance Junction-to-Board | 56.8 C/W DGV; 57.8 C/W DBQ; 57.8 C/W PW; 25.9 C/W RGY |
| Output Enable Polarity | Active low |
| Select Pin | S pin selects switch path |
| Partial-Power-Down Support | Ioff supports partial-power-down mode operation |
| Latch-Up Performance | exceeds 100 mA; per JESD 78, class II |
| Datasheet Status | request_only |
Product Overview
The SN74CB3Q3257_Bus-Switch is a Texas Instruments Interface device described as a 4-bit 1-of-2 FET multiplexer and demultiplexer bus switch. Its data path bandwidth is specified up to 500 MHz, and the device provides low on-state resistance with 4 ohm typical values under multiple test conditions.
Key Features
- 4-bit 1-of-2 FET multiplexer and demultiplexer bus switch
- Data path bandwidth specified up to 500 MHz
- Typical on-state resistance is 4 ohm
- Recommended VCC operating range is 2.3 V to 3.6 V
- Data I/O supports 0 V to 5.5 V operation
- Active-low OE input controls switch enable state
- S pin selects the active switch path
- Ioff supports partial-power-down mode operation
- HBM ESD rating is +/-2000 V
- Latch-up performance exceeds 100 mA per JESD 78
Typical Applications
- 4-bit bus multiplexing
- Bus demultiplexing paths
- High-bandwidth data routing
- Partial-power-down interface designs
- 2.3 V to 3.6 V systems
- 5.5 V tolerant data I/O switching
- Active-low output-enable switching
- Compact 16-pin interface layouts
Procurement Notes
When requesting a quote for SN74CB3Q3257_Bus-Switch, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For MCU, processor and logic IC sourcing, package, operating voltage, temperature grade, speed or frequency grade, firmware or mask version, lifecycle status and programming requirements should be checked before approval.
FAQ
What function does SN74CB3Q3257_Bus-Switch provide?
SN74CB3Q3257_Bus-Switch is a Texas Instruments 4-bit 1-of-2 FET multiplexer and demultiplexer bus switch for Interface applications, with an S select pin used to choose the switch path.
What supply and data I/O ranges are specified?
The recommended supply voltage range is 2.3 V to 3.6 V. The recommended data I/O voltage range is 0 V to 5.5 V, according to the extracted operating-condition facts.
Which package options are listed for this device?
The listed package options are 16-pin TVSOP DGV at 3.6mm x 6.4mm, SSOP DBQ at 4.9mm x 6mm, TSSOP PW at 5mm x 6.4mm, and VQFN RGV/RGY at 4mm x 3.5mm.
What timing values are specified at 3.3 V operation?
At VCC = 3.3 V +/-0.3 V, propagation delay is 0.2 ns typical and 0.32 ns maximum. Select propagation delay is 1.5 ns minimum, 4.1 ns typical, and up to 6.5 ns maximum at 105 C.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.