Texas Instruments SN74CBTLV3245ADWE4

Overview

SN74CBTLV3245ADWE4 from Texas Instruments is a low-voltage octal FET bus switch in SOIC-20 package, providing bidirectional 8-bit signal routing with 5 Ω on-state resistance, rail-to-rail switching, and I_off partial-power-down support. It operates from 2.3 V to 3.6 V and is used for high-speed data path isolation in enterprise computing and wired networking.

For engineers reviewing the SN74CBTLV3245ADWE4 datasheet, SN74CBTLV3245ADWE4 pinout, SN74CBTLV3245ADWE4 application, or SN74CBTLV3245ADWE4 equivalent, key selection criteria include on-resistance (5–8 Ω), propagation delay (0.15–0.25 ns), I_off leakage (≤40 µA at V_CC = 0), operating temperature range (–40°C to +85°C), and SOIC-20 mechanical compatibility.

Technical Context

The SN74CBTLV3245ADWE4 implements an 8-bit single-pole single-throw (SPST) FET switch array with active-low output enable (OE). Each A–B channel features symmetric, bidirectional conduction and rail-to-rail voltage handling across the full supply range.

Its I_off protection blocks backflow current when V_CC = 0, enabling safe hot-insertion and partial power-down operation. The device maintains high-impedance isolation between ports when OE is high, with typical off-capacitance of 9 pF and input capacitance of 4 pF.

Key Specifications

Pinout & Package

SN74CBTLV3245ADWE4 uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with gull-wing leads and standard 1.27 mm pitch. Thermal performance is characterized by R_θJA = 58 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Compared with SN74CBTLV3245ADWE4, the PWR variant saves 45% board area but sacrifices thermal performance, while the RGYR variant extends temperature range and improves heat dissipation at the cost of soldering complexity and rework difficulty.

Availability

SN74CBTLV3245ADWE4 is available at Aetrix Electronics and suitable for datacenter interconnect, enterprise networking switch, and industrial building automation requiring stable component supply and long-term production continuity.

Supply support for SN74CBTLV3245ADWE4 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 decades of expertise in high-reliability interface solutions.

The SN74CBTLV3245A family was designed for high-speed, low-voltage bus switching in enterprise infrastructure and industrial control systems where signal fidelity, power sequencing safety, and compact packaging are critical.

FAQ

What is the maximum operating frequency supported by SN74CBTLV3245ADWE4?

The SN74CBTLV3245ADWE4 does not specify a hard maximum frequency but achieves 0.15–0.25 ns propagation delay and ≤9 pF off-capacitance, enabling reliable operation up to 1–2 GHz in well-terminated transmission lines. Actual bandwidth depends on PCB layout, load capacitance, and signal edge rate-not a fixed clock frequency limit. SN74CBTLV3245ADWE4 is optimized for high-speed digital switching rather than periodic clock distribution.

Does SN74CBTLV3245ADWE4 require external pull-up resistors on the OE pin?

Yes-TI explicitly recommends tying OE to V_CC via a pull-up resistor during power-up and power-down to maintain high-impedance state. A floating OE can cause unintended switching and excess current draw. SN74CBTLV3245ADWE4 has no internal pull-up; resistor value depends on driver sink strength but typically ranges from 4.7 kΩ to 10 kΩ. This requirement is documented in Section 7.2.1 of the datasheet.

Can SN74CBTLV3245ADWE4 operate with 1.8 V logic levels?

No-SN74CBTLV3245ADWE4 is specified only for 2.3 V to 3.6 V supply operation. At 1.8 V, the device fails to meet guaranteed r_on, t_pd, and I_off specifications. TI does not characterize or warrant performance below 2.3 V. For 1.8 V systems, consider the SN74CBTLV3125 or SN74CBTLV3244 families instead of SN74CBTLV3245ADWE4.

Is SN74CBTLV3245ADWE4 pin-compatible with older 74LVC245 devices?

SN74CBTLV3245ADWE4 shares the standard '245-type pinout (A/B port mapping and OE location), but differs electrically: it lacks direction control (DIR), uses single OE for all 8 bits, and has no internal buffers. While PCB footprint matches, logic behavior and drive strength differ-direct substitution requires validation of signal timing, loading, and power sequencing. SN74CBTLV3245ADWE4 is not a functional drop-in for 74LVC245.

What is the thermal pad configuration for SN74CBTLV3245ADWE4?

SN74CBTLV3245ADWE4 uses a standard SOIC-20 package (DW) with no exposed thermal pad-unlike VQFN variants (RGY/RKS). Heat dissipation relies solely on leads and package body, with R_θJA = 58 °C/W. No thermal vias or solder paste under the package are required or recommended. SN74CBTLV3245ADWE4's thermal design follows conventional SOIC practices, not thermally enhanced QFN layouts.