SN74CB3T3257

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3.3-V, 2:1 (SPDT), 4-channel FET bus switch with level shifter

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Data sheet

document-pdfAcrobat SN74CB3T3257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer 2.5V/3.3V Low-Voltage Bus Switch With 5V-Tolerant Level Shifter datasheet (Rev. B) PDF | HTML

SN74CB3T3257

ACTIVE

Data sheet

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Product details

Protocols

Analog, I2C, I2S, JTAG, RGMII, SPI, TDM, UART

Configuration

2:1 SPDT

Number of channels

4

Bandwidth (MHz)

100

Ron (typ) (mΩ)

5000

Input/output voltage (min) (V)

0

Input/output voltage (max) (V)

5.5

Operating temperature range (°C)

-40 to 85

ESD CDM (kV)

1

Input/output continuous current (max) (mA)

128

COFF (typ) (pF)

5

CON (typ) (pF)

4

OFF-state leakage current (max) (µA)

10

Ron (max) (mΩ)

8000

VIH (min) (V)

1.7

VIL (max) (V)

0.8

Rating

Catalog

Protocols

Analog, I2C, I2S, JTAG, RGMII, SPI, TDM, UART

Configuration

2:1 SPDT

Number of channels

4

Bandwidth (MHz)

100

Ron (typ) (mΩ)

5000

Input/output voltage (min) (V)

0

Input/output voltage (max) (V)

5.5

Operating temperature range (°C)

-40 to 85

ESD CDM (kV)

1

Input/output continuous current (max) (mA)

128

COFF (typ) (pF)

5

CON (typ) (pF)

4

OFF-state leakage current (max) (µA)

10

Ron (max) (mΩ)

8000

VIH (min) (V)

1.7

VIL (max) (V)

0.8

Rating

Catalog

TVSOP (DGV)

16

23.04 mm² (3.6 mm × 6.4 mm)

TSSOP (PW)

16

32 mm² (5 mm × 6.4 mm)

SOT-23-THN (DYY)

16

8.4 mm² (4.2 mm × 2 mm)

Output voltage translation tracks VCC
Supports mixed-mode signal operation on all data I/O ports
- 5V input down to 3.3V output level shift with 3.3V VCC
- 5V/3.3V input down to 2.5V output level shift with 2.5V VCC
5V-tolerant I/Os with device powered up or powered down
Bidirectional data flow with near-zero propagation delay
Low ON-state resistance (ron) characteristics (ron = 5Ω typ)
Low input/output capacitance minimizes loading (Cio(OFF) = 5pF typ)
Data and control inputs provide undershoot clamp diodes
Low power consumption (ICC = 20µA max)
VCC operating range from 2.3V to 3.6V
Data I/Os support 0V to 5V signaling levels (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V)
Control inputs can be driven by TTL or 5V/3.3V CMOS outputs
Ioff supports partial-power-down mode operation
Latch-up performance exceeds 250mA per JESD 17
ESD performance tested per JESD 22
- 2000V human-body model (A114B, Class II)
- 1000V charged-device model (C101)

Output voltage translation tracks VCC
Supports mixed-mode signal operation on all data I/O ports
- 5V input down to 3.3V output level shift with 3.3V VCC
- 5V/3.3V input down to 2.5V output level shift with 2.5V VCC
5V-tolerant I/Os with device powered up or powered down
Bidirectional data flow with near-zero propagation delay
Low ON-state resistance (ron) characteristics (ron = 5Ω typ)
Low input/output capacitance minimizes loading (Cio(OFF) = 5pF typ)
Data and control inputs provide undershoot clamp diodes
Low power consumption (ICC = 20µA max)
VCC operating range from 2.3V to 3.6V
Data I/Os support 0V to 5V signaling levels (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V)
Control inputs can be driven by TTL or 5V/3.3V CMOS outputs
Ioff supports partial-power-down mode operation
Latch-up performance exceeds 250mA per JESD 17
ESD performance tested per JESD 22
- 2000V human-body model (A114B, Class II)
- 1000V charged-device model (C101)

The SN74CB3T3257 is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state resistance (ron), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks VCC. The SN74CB3T3257 supports systems using 5V TTL, 3.3V LVTTL, and 2.5V CMOS switching standards, as well as user-defined switching levels.

This device is fully specified for partial-power-down applications using Ioff. The Ioff feature verifies that damaging current does not backflow through the device when the device is powered down. The device has isolation during power off.

The SN74CB3T3257 is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state resistance (ron), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks VCC. The SN74CB3T3257 supports systems using 5V TTL, 3.3V LVTTL, and 2.5V CMOS switching standards, as well as user-defined switching levels.

This device is fully specified for partial-power-down applications using Ioff. The Ioff feature verifies that damaging current does not backflow through the device when the device is powered down. The device has isolation during power off.

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Technical documentation

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Top documentation	Type	Title	Format options	Date
*	Data sheet	SN74CB3T3257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer 2.5V/3.3V Low-Voltage Bus Switch With 5V-Tolerant Level Shifter datasheet (Rev. B)	PDF \| HTML	Dec 9, 2025
	Application note	Selecting the Correct Texas Instruments Signal Switch (Rev. E)	PDF \| HTML	Jun 2, 2022
	Application note	Multiplexers and Signal Switches Glossary (Rev. B)	PDF \| HTML	Dec 1, 2021
	Application brief	Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C)	PDF \| HTML	Jan 6, 2021

Design & development

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Interface adapter

LEADED-ADAPTER1 — Surface mount to DIP header adapter for quick testing of TI's 5, 8, 10, 16 & 24-pin leaded packages

The EVM-LEADED1 board allows for quick testing and bread boarding of TI's common leaded packages. The board has footprints to convert TI's D, DBQ, DCT,DCU, DDF, DGS, DGV, and PW surface mount packages to 100mil DIP headers.

User guide: PDF

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Simulation model