Texas Instruments SN74LVTH374DBR

Overview

SN74LVTH374DBR from Texas Instruments is an octal edge-triggered D-type flip-flop IC designed for 3.3-V V_CC operation with 5-V tolerant inputs and outputs, supporting mixed-mode signal interfacing between 3.3-V logic and legacy 5-V systems. It features bus-hold circuitry on data inputs, I_off and power-up 3-state for hot insertion, and operates down to 2.7 V supply. It is used in address/data latching and bus interface applications in industrial control and communications equipment.

For engineers reviewing the SN74LVTH374DBR datasheet, SN74LVTH374DBR pinout, SN74LVTH374DBR application, or SN74LVTH374DBR equivalent, key selection criteria include its 20-pin SSOP package, 150-MHz maximum clock frequency, ±64-mA output drive, bus-hold input retention, and support for unregulated battery operation - all critical for robust 3.3-V/5-V mixed-signal system design.

Technical Context

The SN74LVTH374DBR implements eight independent positive-edge-triggered D flip-flops with asynchronous output-enable (OE) control. Its TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and 5-V-tolerant I/O allow direct connection to 5-V buses while powered from a 3.3-V rail.

Internal bus-hold circuitry maintains valid logic states on undriven D inputs without external resistors, and I_off protection disables outputs during power-down to prevent backflow current. Power-up 3-state ensures high-impedance outputs until V_CC exceeds 1.5 V, enabling safe hot-plug operation in backplane and modular systems.

Key Specifications

Pinout & Package

SN74LVTH374DBR is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm max height - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC374APWR and 74ALVCH16374DGGR, the SN74LVTH374DBR uniquely combines 5-V-tolerant I/O, integrated bus-hold, and hot-insertion support in a compact 20-pin SSOP - making it the only option requiring zero external components for robust 3.3-V/5-V bus bridging.

Availability

SN74LVTH374DBR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, communications backplane interfaces, and automated test fixture control requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVTH374DBR 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 expertise in high-reliability interface and timing products.

The SN74LVTH374DBR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interfacing - delivering robust 3.3-V operation with full 5-V signal compatibility and hot-swap readiness.

FAQ

What is the operating voltage range for SN74LVTH374DBR?

The SN74LVTH374DBR operates from 2.7 V to 3.6 V on V_CC. Its inputs tolerate up to 5.5 V, and outputs swing rail-to-rail within the V_CC range - enabling direct interfacing with both 3.3-V and 5-V logic families without level shifters. This dual-voltage capability is confirmed in the recommended operating conditions table of the SCBS683H datasheet.

Does SN74LVTH374DBR support hot insertion?

Yes, SN74LVTH374DBR supports hot insertion via two integrated features: I_off circuitry disables outputs when V_CC = 0 V to prevent backflow current, and power-up 3-state holds outputs in high-impedance until V_CC exceeds 1.5 V. These functions are explicitly documented in the device description and absolute maximum ratings sections of the datasheet.

What package type is SN74LVTH374DBR supplied in?

SN74LVTH374DBR is supplied in a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm maximum height. The "DB" in the part number denotes this specific SSOP variant, and mechanical drawings DB0020A confirm its JEDEC MO-150 compliance and tape-and-reel packaging (2000 units per reel).

How does the bus-hold feature work on SN74LVTH374DBR?

The bus-hold circuitry on SN74LVTH374DBR actively maintains the last-valid logic state on each D input using weak feedback transistors - eliminating the need for external pull-up or pull-down resistors. Its hold current is ±75 µA at V_CC = 3 V, as specified in the electrical characteristics table, ensuring reliable state retention during signal float or open-bus conditions.

What is the maximum clock frequency supported by SN74LVTH374DBR?

SN74LVTH374DBR supports a maximum clock frequency of 150 MHz across its full operating temperature range (−40°C to +85°C) and V_CC range (2.7 V to 3.6 V). This value is specified in the timing requirements table of the SCBS683H datasheet and verified under CL = 50 pF load conditions.