Texas Instruments 74CBTLV3245ADWRG4

Overview

74CBTLV3245ADWRG4 from Texas Instruments is a low-voltage octal FET bus switch in SOIC-20 package, featuring 5 Ω typical on-state resistance, rail-to-rail switching across 2.3 V–3.6 V supply, and I_off support for partial-power-down mode. It enables bidirectional signal routing between A and B ports under OE control in high-speed digital interconnects such as memory expansion and FPGA I/O bridging.

For engineers reviewing the 74CBTLV3245ADWRG4 datasheet, 74CBTLV3245ADWRG4 pinout, 74CBTLV3245ADWRG4 application, or 74CBTLV3245ADWRG4 equivalent, key selection criteria include guaranteed 5–8 Ω r_on at 2.5 V/3.3 V, sub-1 ns enable/disable timing, ±40 µA I_off at V_CC = 0 V, and JESD 17 latch-up immunity exceeding 250 mA.

Technical Context

The 74CBTLV3245ADWRG4 implements eight independent FET-based bilateral switches with no internal logic inversion-each A_n–B_n path operates as a passive, voltage-controlled transmission gate. Its OE input uses positive-logic control: low enables conduction (A↔B), high forces high-impedance isolation.

Designed for low-voltage mixed-signal systems, it supports rail-to-rail analog/digital signal pass-through without level shifting, and its I_off specification ensures <40 µA backflow current when V_CC = 0 V and I/O pins are biased 0–3.6 V-critical for hot-insertion and multi-rail power sequencing.

Key Specifications

Pinout & Package

74CBTLV3245ADWRG4 is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.35 mm (JEDEC MS-013), with standard '245-type pinout and NC (no internal connection) on pins 1 and 20.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3245ADWR and 74LVC245APW, the 74CBTLV3245ADWRG4 delivers superior signal fidelity (5 Ω vs. ≥15 Ω), guaranteed I_off protection, and tighter timing (sub-0.25 ns t_pd), making it the preferred choice for high-speed, multi-rail embedded systems requiring robust hot-swap capability.

Availability

74CBTLV3245ADWRG4 is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O bridging, hot-swappable module backplanes, and low-voltage test equipment interconnects requiring stable component supply and long-term lifecycle assurance.

Supply support for 74CBTLV3245ADWRG4 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 logic solutions, with over 50 years of innovation in high-reliability interface and signal-path components.

The SN74CBTLV3245A product line targets high-speed digital interconnect applications demanding ultra-low on-resistance, rail-to-rail signal pass-through, and robust power sequencing support in space-constrained industrial and communications systems.

FAQ

What is the maximum operating temperature range for the 74CBTLV3245ADWRG4?

The 74CBTLV3245ADWRG4 is rated for operation from –40°C to +85°C ambient temperature, matching the extended industrial temperature grade specified in the TI SCDS034L datasheet. This range applies across the full 2.3 V–3.6 V V_CC supply range and ensures reliable switching performance in fanless enclosures and outdoor-mounted electronics where thermal cycling occurs.

Does the 74CBTLV3245ADWRG4 support true bidirectional signal flow without direction control?

Yes, the 74CBTLV3245ADWRG4 implements eight independent FET transmission gates with no internal direction logic-signals pass identically from A to B or B to A depending on voltage potential. This architecture eliminates propagation delay asymmetry and enables seamless use in analog multiplexing, clock distribution, and differential pair routing where polarity preservation is critical.

How should OE be handled during power-up to ensure predictable initial state for the 74CBTLV3245ADWRG4?

To guarantee high-impedance state at power-up, OE must be held high (V_CC) until V_CC stabilizes. TI recommends connecting OE to V_CC through a pullup resistor; minimum value is determined by the driver's sink capability-typically 10 kΩ suffices for CMOS drivers. Leaving OE floating risks undefined switching states and potential bus contention during brown-out conditions.

Can the 74CBTLV3245ADWRG4 be used to switch analog signals such as audio or sensor outputs?

Yes-the 74CBTLV3245ADWRG4 supports rail-to-rail analog signal switching up to its V_CC limit (3.6 V max), with flat on-resistance (5–8 Ω) and low charge injection (<1 pC). It has been validated in audio routing and precision sensor multiplexing applications where THD < –80 dB and bandwidth >200 MHz are required, provided layout follows low-noise grounding and guard traces.

Is the 74CBTLV3245ADWRG4 pin-compatible with older 74-series bus switches like the 74LS245?

No-the 74CBTLV3245ADWRG4 uses standard '245 pinout but is not functionally or electrically compatible with bipolar 74LS245. It lacks direction control (DIR) and output enables (OE) active-high variants, and operates only at 2.3–3.6 V. Direct replacement requires verifying OE logic polarity, absence of DIR pin, and confirming V_CC compatibility in the target system.