Texas Instruments SN74CBTLV3253D

Overview

SN74CBTLV3253D from Texas Instruments is a dual 1-of-4 low-voltage FET multiplexer/demultiplexer in SOIC-16 package, featuring 5 Ω typical on-state resistance, rail-to-rail I/O switching, and I_off partial-power-down support. It enables high-speed signal routing in 2-channel, 4:1 configurations for enterprise computing and wired networking interfaces.

For engineers reviewing the SN74CBTLV3253D datasheet, SN74CBTLV3253D pinout, SN74CBTLV3253D application, or SN74CBTLV3253D equivalent, key selection criteria include guaranteed 5 Ω r_on at 2.5 V/3.3 V, sub-1 ns propagation delay, active-low OE control per channel, and −40°C to 85°C industrial temperature operation with SOIC-16 mechanical compatibility.

Technical Context

The SN74CBTLV3253D implements two independent 1-of-4 analog switch arrays using low-threshold FETs, each controlled by S0/S1 select lines and dedicated active-low OE inputs. Its rail-to-rail I/O supports voltage translation between 0 V and V_CC (2.3–3.6 V), with no level-shifting circuitry required.

I_off protection limits backflow current to ≤15 µA when V_CC = 0 V and any I/O is biased 0–3.6 V, enabling hot-swap and partial-power-down system architectures. The device maintains high-impedance isolation during power-off states without external biasing.

Key Specifications

Pinout & Package

SN74CBTLV3253D uses a 16-pin SOIC package (9.90 mm × 3.90 mm, 1.27 mm pitch) with standard JEDEC MS-012AC outline and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3253DBQ and QS3253, the SN74CBTLV3253D offers the largest PCB footprint and highest thermal mass among equivalents - advantageous for manual rework and thermal stability in high-ambient environments, but less suitable for ultra-dense routing.

Availability

SN74CBTLV3253D is available at Aetrix Electronics and suitable for datacenter interconnect, wired networking switch fabric, and industrial video broadcasting requiring stable component supply across extended product lifecycles.

Supply support for SN74CBTLV3253D 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 50 years of innovation in high-reliability interface solutions.

The SN74CBTLV3253D belongs to TI's CBTLV logic family, designed specifically for low-voltage, high-speed signal routing in enterprise infrastructure and industrial communications systems where minimal propagation delay and robust power-down behavior are critical.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV3253D?

The SN74CBTLV3253D does not specify a hard maximum frequency limit, but its 0.15–0.25 ns propagation delay and 5 Ω on-resistance support clean signal routing up to 1 GHz for digital waveforms and high-fidelity analog signals. System-level bandwidth depends on trace capacitance and load; TI recommends limiting total capacitive load to ≤30 pF for optimal performance. The SN74CBTLV3253D maintains signal integrity in applications like 10G Ethernet lane switching and DDR address bus multiplexing.

Does the SN74CBTLV3253D support level shifting between different voltage domains?

Yes, the SN74CBTLV3253D supports rail-to-rail I/O operation, allowing signals from 0 V to V_CC (2.3–3.6 V) on all ports. This enables bidirectional voltage translation - for example, connecting a 2.5 V FPGA I/O to a 3.3 V peripheral without external level shifters. However, V_CC must be set to the higher of the two domains to avoid forward-biasing internal protection diodes. The SN74CBTLV3253D achieves this via FET-only switch architecture with no internal logic voltage references.

How does the I_off feature function in the SN74CBTLV3253D during partial power-down?

The I_off feature in the SN74CBTLV3253D disables current conduction between I/O terminals when V_CC = 0 V, limiting backflow to ≤15 µA even if I/O pins are biased 0–3.6 V. This prevents damage to powered-down sections and avoids unintended logic states in mixed-power systems. The SN74CBTLV3253D achieves this through gate-controlled FET cutoff, ensuring high-impedance isolation without external pull-ups. It is validated per JESD78 Class II latch-up standards.

Is the SN74CBTLV3253D pin-compatible with the QS3253?

Yes, the SN74CBTLV3253D is functionally and physically pin-compatible with the QS3253, sharing identical pin configuration, electrical characteristics, and timing parameters. TI explicitly states functional equivalence in the datasheet, and both devices use the same SOIC-16 (D) package outline. No PCB layout changes are required when substituting SN74CBTLV3253D for QS3253 in existing designs, making it a direct drop-in replacement.

What decoupling capacitance is recommended for the SN74CBTLV3253D?

Texas Instruments recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the V_CC pin (Pin 16) of the SN74CBTLV3253D, with short, low-inductance traces to GND (Pin 8). For systems with high-frequency noise or multiple SN74CBTLV3253D units, adding a parallel 1 µF capacitor improves low-frequency filtering. The SN74CBTLV3253D has only one V_CC pin, so a single local 0.1 µF cap suffices for most applications - verified in TI's layout guidelines and typical application circuits.