Texas Instruments SN74CBTLV3257PWG4

Overview

SN74CBTLV3257PWG4 from Texas Instruments is a low-voltage 4-bit 1-of-2 FET multiplexer/demultiplexer with 5 Ω on-state resistance, rail-to-rail I/O switching, and I_off partial-power-down support. It operates from 2.3 V to 3.6 V, delivers sub-6 ns propagation delay (tpd), and enables bidirectional signal routing in high-speed data buses for enterprise computing and wired networking systems.

For engineers reviewing the SN74CBTLV3257PWG4 datasheet, SN74CBTLV3257PWG4 pinout, SN74CBTLV3257PWG4 application, or SN74CBTLV3257PWG4 equivalent, key selection criteria include its 16-pin TSSOP package, active-low OE control, S-select logic, 128 mA channel current rating, and JESD 78 Class II latch-up immunity - all critical for bus isolation and hot-swap-capable interconnect designs.

Technical Context

The SN74CBTLV3257PWG4 implements four independent bidirectional analog switches, each configurable as 1-of-2 via shared S and OE inputs. Its FET-based architecture provides symmetrical, low-distortion signal paths with no internal level-shifting circuitry.

Each switch supports rail-to-rail voltage swing (0 V to V_CC) and exhibits ≤8 Ω typical on-resistance at V_CC = 3.3 V with 64 mA test current. The I_off feature limits leakage to ≤15 µA when V_CC = 0 V, enabling safe back-drive protection during partial power-down sequences.

Key Specifications

Pinout & Package

Packaged in a 16-pin TSSOP (PW) measuring 5.00 mm × 4.40 mm with exposed thermal pad (not electrically connected), SN74CBTLV3257PWG4 uses standard surface-mount footprint and JEDEC-compliant lead finish (NIPDAU, MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FET multiplexer applications.

Compared with SN74CBTLV3257PWG4, SN74CBTLV3257PWR offers identical performance with standard packaging logistics, while SN74CBTLV3257DGVRG4 trades larger TSSOP real estate for higher density - both require no schematic changes but differ in layout and procurement planning.

Availability

SN74CBTLV3257PWG4 is available at Aetrix Electronics and suitable for datacenter bus multiplexing, industrial Ethernet node switching, and enterprise storage backplane sharing requiring stable component supply across multi-year production cycles.

Supply support for SN74CBTLV3257PWG4 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 high-reliability electronic components.

The SN74CBTLV3257PWG4 belongs to TI's CBTLV logic family, engineered for ultra-low on-resistance and high-speed signal routing in next-generation computing, networking, and industrial control infrastructure.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV3257PWG4?

The SN74CBTLV3257PWG4 is characterized for operation up to 200 MHz, validated by measured propagation delay (t_pd) of 0.15–0.25 ns at 2.5 V and 1.8–5.3 ns at 3.3 V. Real-world bandwidth depends on trace impedance, load capacitance, and termination - TI recommends limiting total capacitive load to ≤30 pF per channel to maintain signal fidelity at full rated speed. SN74CBTLV3257PWG4 performance remains stable across its –40 °C to +85 °C operating range.

Does the SN74CBTLV3257PWG4 support hot-swap or partial-power-down operation?

Yes, the SN74CBTLV3257PWG4 fully supports partial-power-down via its I_off feature: when V_CC = 0 V, leakage current is limited to ≤15 µA even with I/O voltages up to 3.6 V applied. This prevents damaging back-current flow and ensures isolation during hot-insertion events. To guarantee high-impedance state at power-up/power-down, OE must be pulled up to V_CC with an appropriate resistor - SN74CBTLV3257PWG4 datasheet specifies minimum pull-up strength based on driver sink capability.

What are the absolute maximum ratings for SN74CBTLV3257PWG4 supply and I/O voltages?

The SN74CBTLV3257PWG4 has an absolute maximum supply voltage (V_CC) of –0.5 V to 4.6 V and absolute maximum I/O voltage (V_I) of –0.5 V to 4.6 V. These ratings allow overvoltage tolerance beyond normal operating range - for example, I/O pins remain functional and undamaged when driven to 4.6 V even with V_CC = 2.5 V. However, recommended operating conditions restrict V_CC to 2.3–3.6 V and specify VIH/VIL thresholds accordingly. Exceeding absolute max ratings risks permanent damage.

How does the SN74CBTLV3257PWG4 handle bidirectional signal flow?

The SN74CBTLV3257PWG4 uses passive FET switches with no directionality - signal flow is inherently bidirectional between any A and selected B port (B1 or B2). Each channel behaves like a low-resistance analog path (5–8 Ω typical), allowing data, clock, or control signals to pass equally well in either direction without added latency or distortion. This makes SN74CBTLV3257PWG4 ideal for multiplexing bidirectional buses such as I²C, SMBus, or parallel address/data lines where master-slave roles may reverse dynamically.

Is the SN74CBTLV3257PWG4 pin-compatible with other members of the CBTLV3257 family?

Yes, all CBTLV3257 variants - including SN74CBTLV3257PWG4, SN74CBTLV3257DGVRG4, and SN74CBTLV3257DBQRG4 - share identical pin functions and logic behavior. Differences are strictly mechanical: PW = TSSOP, DGV = TVSOP, DBQ = SSOP. SN74CBTLV3257PWG4 uses 16-pin TSSOP with 0.65 mm pitch and 5.00 mm × 4.40 mm body; substitution requires only land pattern adjustment, not schematic or firmware changes. All variants meet the same electrical, thermal, and reliability specifications.