Texas Instruments SN74LVTH273MNSREP

Overview

SN74LVTH273MNSREP from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with direct clear (CLR), designed for 3.3-V V_CC operation while supporting 5-V TTL-level inputs and outputs. It features bus-hold circuitry on all data inputs, I_off partial power-down protection, and operates across −55°C to 125°C for aerospace and defense applications requiring radiation-tolerant logic in harsh environments.

For engineers reviewing the SN74LVTH273MNSREP datasheet, SN74LVTH273MNSREP pinout, SN74LVTH273MNSREP application, or SN74LVTH273MNSREP equivalent, key selection criteria include its extended temperature range, mixed-voltage interface capability, bus-hold input stabilization, I_off support for hot-swap systems, and SOP-20 package compatibility with legacy 74-series timing layouts.

Technical Context

This device implements eight independent edge-triggered D flip-flops with synchronous data capture on the rising edge of CLK and asynchronous active-low CLR. Each stage includes buffered clock and clear inputs, eliminating external signal conditioning for high-noise industrial control buses.

The integrated bus-hold circuitry maintains valid logic states on undriven D inputs without external resistors, and the I_off feature disables outputs during power-down to prevent backflow current-critical for multi-rail systems with staggered power sequencing.

Key Specifications

Pinout & Package

SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.27 mm pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVTH273MNSREP, SN74LVC273QPWREP offers lower static power but sacrifices bus-hold stability and cold-temperature margin, while SN74ACT273NSR provides higher noise immunity at 5 V but cannot operate below 4.5 V or interface safely with 3.3-V logic domains.

Availability

SN74LVTH273MNSREP is available at Aetrix Electronics and suitable for aerospace telemetry, industrial PLC I/O, and military radio control applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH273MNSREP 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 decades of heritage in high-reliability military and space-grade components.

The SN74LVTH273MNSREP belongs to TI's enhanced-product (EP) logic family, engineered for mission-critical applications demanding extended temperature operation, controlled baseline manufacturing, and full DMS support.

FAQ

What is the operating temperature range of the SN74LVTH273MNSREP?

The SN74LVTH273MNSREP is rated for continuous operation from −55°C to 125°C. This extended range is validated through JEDEC-qualified testing including temperature cycling, HAST, and autoclave exposure, making it suitable for deployment in unheated military vehicles, orbital platforms, and oilfield downhole tools where ambient extremes are routine. The SN74LVTH273MNSREP maintains full functionality across this span without derating.

Does the SN74LVTH273MNSREP support mixed-voltage interfacing?

Yes, the SN74LVTH273MNSREP supports mixed-voltage operation: it runs on a 3.3-V supply (V_CC = 2.7 V to 3.6 V) while accepting 5-V TTL-level inputs (VI up to 7 V) and driving 5-V-compatible outputs. This eliminates external level shifters in systems integrating legacy 5-V peripherals with modern 3.3-V FPGAs or microcontrollers, and the SN74LVTH273MNSREP maintains specified timing and drive strength across the full input voltage range.

How does the bus-hold feature work on the SN74LVTH273MNSREP?

The SN74LVTH273MNSREP integrates active bus-hold circuitry on all eight D inputs, which detects and maintains the last-valid logic state when inputs float or become undriven. It sources or sinks up to ±750 µA to hold the line near V_CC/2, eliminating the need for discrete 10-kΩ pullup or pulldown resistors. Using external resistors with the SN74LVTH273MNSREP is explicitly discouraged in the datasheet, as they conflict with the internal bus-hold bias network.

What is the purpose of the I_off specification in the SN74LVTH273MNSREP?

The I_off feature in the SN74LVTH273MNSREP disables all outputs when V_CC = 0 V, limiting leakage current to ±100 µA regardless of input or output voltage. This prevents damaging back-current flow in hot-swap backplanes, multi-rail power systems, or modular chassis where boards may be inserted or removed while other rails remain active. The SN74LVTH273MNSREP remains electrically isolated under these conditions without requiring external isolation circuitry.

Is the SN74LVTH273MNSREP pin-compatible with standard 74-series octal D flip-flops?

The SN74LVTH273MNSREP uses the industry-standard 20-pin SOP (NS) footprint and matches the pinout of legacy 74HCT273 and 74ACT273 devices, including identical CLK, CLR, D, and Q assignments. However, due to its 3.3-V core and bus-hold inputs, direct substitution requires verification of V_CC and input drive compatibility; the SN74LVTH273MNSREP is not a drop-in replacement in 5-V-only systems without voltage translation.