SN74CB3T3257

ACTIVE

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

Texas Instruments SN74CB3T3257 Product Info

1 April 2026 4

Parameters

Protocols	Analog, I2C, I2S, JTAG, RGMII, SPI, TDM, UART
Configuration	2:1 SPDT
Number of channels	4
Bandwidth (MHz)	100
Supply voltage (max) (V)	3.6
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

Package

SOT-23-THN (DYY)-16-8.4 mm² 4.2 x 2

Features

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)

Description

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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ELECTRONIC COMPONENTS
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SN74CB3T3257

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

Texas Instruments SN74CB3T3257 Product Info

Parameters

Package

Features

Description

SUBMITTED SUCCESSFULLY！

ELECTRONIC COMPONENTS All In One Distributor

SN74CB3T3257

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

Texas Instruments SN74CB3T3257 Product Info

Parameters

Package

Features

Description

SUBMITTED SUCCESSFULLY！

ELECTRONIC COMPONENTS
All In One Distributor