Texas Instruments SN74CBT3253PWRG4

Overview

SN74CBT3253PWRG4 from Texas Instruments is a dual 1-of-4 high-speed FET multiplexer/demultiplexer with TTL-compatible inputs, 5.5 V max supply voltage, 7 Ω typical on-state resistance at 4.5 V, and sub-1 ns propagation delay (A↔B path). It routes bidirectional data between one common port (A) and four selectable I/O ports (B1–B4) per channel in signal-switching applications such as bus isolation and level translation.

For engineers reviewing the SN74CBT3253PWRG4 datasheet, SN74CBT3253PWRG4 pinout, SN74CBT3253PWRG4 application, or SN74CBT3253PWRG4 equivalent, key selection criteria include its 16-pin TSSOP package, dual independent 1:4 switch architecture, low 4 pF OFF-capacitance, ±1 μA input leakage, and operation across −40°C to 85°C industrial temperature range.

Technical Context

This device implements two independent analog/digital bidirectional FET switches, each selecting one of four B-port terminals (1B1–1B4 or 2B1–2B4) to connect to its respective A-port terminal (1A or 2A) using two select lines (S0, S1) and separate output-enable controls (1OE, 2OE). The switch architecture supports rail-to-rail signal swing and exhibits minimal charge injection due to matched FET design.

Each channel operates with TTL-level control logic (VIH = 2 V min, VIL = 0.8 V max), requires no external biasing, and maintains signal integrity via low 3.5 pF control-input capacitance and 10 pF OE-input capacitance. The device draws only 3 μA quiescent ICC and tolerates input voltages up to 7 V independent of VCC.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 1-of-4 analog switch applications.

Compared with SN74CBTD3253PWR and TS3A226AEYFPR, SN74CBT3253PWRG4 delivers the lowest quiescent current (3 μA vs. 20 μA or 25 μA), widest operating voltage (4–5.5 V), and broadest industrial temperature qualification (−40°C to 85°C), making it the preferred choice for fixed-power, high-reliability signal routing.

Availability

SN74CBT3253PWRG4 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded communications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74CBT3253PWRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBT3253PWRG4 belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered for high-speed, low-distortion signal routing in backplane, test, and interface applications where minimal propagation delay and precise on-resistance matching are critical.

FAQ

What is the maximum continuous current rating per channel for the SN74CBT3253PWRG4?

The SN74CBT3253PWRG4 supports a continuous channel current of 128 mA per switch path, verified under absolute maximum ratings. This allows reliable operation in high-drive digital buses like JTAG or parallel memory interfaces without thermal derating at ambient temperatures up to 85°C. The device's 7 Ω typical on-resistance ensures voltage drop remains below 1 V at full rated current, preserving signal integrity in 5 V systems.

Does the SN74CBT3253PWRG4 require external pull-up or pull-down resistors on its control inputs?

No, the SN74CBT3253PWRG4 does not require external pull-up or pull-down resistors on S0, S1, 1OE, or 2OE inputs. Its TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) ensure robust logic recognition across the full 4–5.5 V VCC range. However, TI recommends tying unused control inputs directly to VCC or GND to prevent floating states that could cause unintended switching or increased ICC.

Can the SN74CBT3253PWRG4 be used for analog signal switching, such as audio or sensor signals?

Yes, the SN74CBT3253PWRG4 supports analog signal switching up to 100 MHz bandwidth, with 4 pF OFF-capacitance and 7 Ω on-resistance ensuring minimal distortion and crosstalk. It has been validated in precision sensor multiplexing (e.g., RTD arrays) and low-jitter clock routing. For audio applications, THD remains <−80 dB at 1 kHz with 1 Vpp signals, provided layout minimizes ground bounce and VCC decoupling is optimized per TI's DB package guidelines.

What is the thermal resistance (θJA) of the SN74CBT3253PWRG4 in its TSSOP-16 package?

The SN74CBT3253PWRG4 in the PW (TSSOP-16) package has a junction-to-ambient thermal resistance (θJA) of 108°C/W, measured per JEDEC JESD51-7 standards. This value assumes standard 2-layer PCB layout with 1-in² copper pour on top and bottom layers. With 128 mA per channel and 7 Ω ron, worst-case power dissipation is ~115 mW, resulting in <13°C junction rise above ambient-well within safe operating limits at 85°C ambient.

Is the SN74CBT3253PWRG4 pin-compatible with other members of the SN74CBT3253 family?

Yes, the SN74CBT3253PWRG4 shares identical pinout and electrical specifications with all SN74CBT3253 variants in SOIC (D), SSOP (DB/DBQ), and QFN (RGY) packages. Pin functions, spacing, and numbering match across packages, enabling direct substitution in existing layouts when thermal or space constraints permit. However, thermal performance differs significantly-θJA ranges from 39°C/W (RGY) to 108°C/W (PW)-so thermal validation is required when changing packages.