Texas Instruments SN74LVTH2952DW

Overview

SN74LVTH2952DW from Texas Instruments is an octal bus transceiver and register IC designed for bidirectional 3.3-V data flow between mixed-voltage (3.3-V VCC / 5-V I/O) systems, featuring dual 8-bit back-to-back registers, bus-hold on all data inputs, and hot-insertion support via Ioff and power-up 3-state. It operates from 2.7 V to 3.6 V and delivers 64 mA sink current per output.

For engineers reviewing the SN74LVTH2952DW datasheet, SN74LVTH2952DW pinout, SN74LVTH2952DW application, or SN74LVTH2952DW equivalent, key selection criteria include its 24-pin SOIC (DW) package, 150 MHz max clock frequency, TTL-compatible 5-V input tolerance, bus-hold elimination of external resistors, and guaranteed hot-swap capability in industrial backplane and modular system designs.

Technical Context

The SN74LVTH2952DW implements two independent 8-bit register paths (A↔B) with separate clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls. Data latching occurs on the low-to-high transition of CLKAB or CLKBA when the corresponding CLKEN is low, enabling synchronous bidirectional buffering.

It supports mixed-mode signaling: 5-V-tolerant inputs and outputs while powered by 3.3-V VCC, with bus-hold circuitry maintaining valid logic levels on floating A/B data lines and Ioff protection preventing backflow during partial power-down - critical for live insertion in telecom and computing backplanes.

Key Specifications

Pinout & Package

SN74LVTH2952DW is housed in a 24-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C reflow unlimited).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bidirectional transceiver applications.

Compared with SN74LVTH2952DW, SN74LVC245APWR offers lower static power but sacrifices 5-V interface support and hot-swap safety, while SN74ALVCH162952GR doubles data width at the cost of pin compatibility and footprint - making SN74LVTH2952DW optimal for retrofitting 8-bit mixed-voltage backplanes with minimal layout change.

Availability

SN74LVTH2952DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular system hot-swap modules, and legacy-to-modern voltage translation applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74LVTH2952DW 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 experience in industrial, automotive, and communications IC design.

The SN74LVTH2952DW belongs to TI's LVTH logic family, engineered specifically for robust mixed-voltage system interfacing - targeting applications where 3.3-V core logic must reliably communicate with legacy 5-V subsystems under dynamic power and thermal conditions.

FAQ

What is the maximum clock frequency supported by the SN74LVTH2952DW?

The SN74LVTH2952DW supports a maximum clock frequency of 150 MHz across its full operating temperature range (−40°C to 85°C) and VCC range (2.7 V to 3.6 V), as verified in the timing characteristics table of the official datasheet. This specification applies to both CLKAB and CLKBA inputs under CL = 50 pF load conditions and ensures reliable synchronous data latching in high-speed bus architectures.

Does the SN74LVTH2952DW require external pullup or pulldown resistors on its A/B data lines?

No, the SN74LVTH2952DW does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all A1–A8 and B1–B8 data inputs. This feature maintains valid logic levels on floating or unused inputs, and using external resistors with the bus-hold function is explicitly discouraged in the datasheet to avoid contention and increased power draw.

Can the SN74LVTH2952DW safely interface a 5-V microcontroller with a 3.3-V FPGA?

Yes, the SN74LVTH2952DW is expressly designed for this use case: its inputs tolerate up to 5.5 V and its outputs drive 5-V TTL loads while operating from a 3.3-V VCC supply. This allows direct, translator-free connection between 5-V microcontrollers and 3.3-V FPGAs - provided OEAB/OEBA and clock controls are managed by the 3.3-V domain to maintain logic compatibility.

What packaging and compliance information applies to the SN74LVTH2952DW?

The SN74LVTH2952DW is supplied in a 24-pin SOIC (DW) package with NiPdAu lead finish, RoHS-compliant, MSL Level-1 (260°C, unlimited floor life), and a tube quantity of 25 units. Its dimensions are 7.5 mm × 12.8 mm × 2.35 mm max height, and it meets JESD 22 ESD standards (2000-V HBM, 200-V MM) and JESD 17 latch-up immunity (>500 mA).

How does the SN74LVTH2952DW support hot insertion in modular systems?

The SN74LVTH2952DW supports hot insertion through two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow, and power-up 3-state forces outputs into high-impedance during power ramp-up/down. Together, these ensure no bus contention or signal corruption occurs when modules are inserted or removed while the system remains powered - a requirement validated per JEDEC JESD78.