NXP Semiconductors 74LVTH125PW,112

Overview

74LVTH125PW,112 from Nexperia is a 3.3 V quad non-inverting 3-state buffer with bus-hold inputs and IOFF partial power-down protection, operating from 2.7 V to 3.6 V supply, delivering ±32 mA/±64 mA output drive, and supporting 5.5 V-tolerant inputs for mixed-voltage system interfacing in industrial control backplanes.

For engineers reviewing the 74LVTH125PW,112 datasheet, 74LVTH125PW,112 pinout, 74LVTH125PW,112 application, or 74LVTH125PW,112 equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.7 ns), bus-hold current (IBHL = 75–150 μA), IOFF leakage (< ±100 μA at VCC = 0 V), and TSSOP14 thermal performance under -40 °C to +85 °C ambient conditions.

Technical Context

This BiCMOS device implements four independent non-inverting buffers, each controlled by an active-low output enable (nOE) input that places the corresponding output in high-impedance state. The bus-hold circuitry actively maintains logic state on unused inputs without external pull-ups, eliminating floating node risks.

IOFF functionality disables outputs during power-down, blocking reverse current flow when VCC = 0 V while inputs/outputs remain at up to 4.5 V - critical for hot-swap and partial-power-down systems. Input overvoltage tolerance to 5.5 V enables direct interfacing with 5 V TTL buses without level shifters.

Key Specifications

Pinout & Package

TSSOP14 package (SOT402-1): 4.4 mm body width, 0.65 mm lead pitch, 14-terminal surface-mount plastic thin shrink small outline package with exposed pad (non-electrical).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with SN74LVC125APW and 74ALVC125PW, the 74LVTH125PW,112 uniquely combines bus-hold, IOFF, and 5.5 V input tolerance - making it the sole option among these three for industrial hot-swap and mixed-voltage backplane designs requiring zero external bias components.

Availability

74LVTH125PW,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable module control, embedded data acquisition buses, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVTH125PW,112 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVTH series delivers high-speed BiCMOS logic with enhanced robustness features - designed specifically for industrial control, communications infrastructure, and embedded systems demanding bus-hold stability and partial power-down safety.

FAQ

What is the maximum allowable input voltage when VCC = 0 V?

The 74LVTH125PW,112 supports input voltages up to 4.5 V even when VCC = 0 V, thanks to its IOFF circuitry. This enables safe hot-insertion into live backplanes where signal lines may be energized before power is applied. Absolute maximum rating is 7.0 V, but sustained operation above 4.5 V with VCC = 0 V is not recommended per datasheet limiting values.

Does the bus-hold feature require external components or configuration?

No. Bus-hold is implemented internally using feedback transistors and activates automatically on all data inputs (1A–4A) without external resistors or configuration. It draws 75–150 μA at VI = 0.8 V to hold LOW states and –75 to –150 μA at VI = 2.0 V to hold HIGH states - fully self-contained and always enabled.

Can this device drive a 5 V bus directly?

No - outputs are 3.3 V CMOS compatible and cannot safely drive a 5 V bus to valid HIGH levels. However, inputs tolerate up to 5.5 V, allowing the device to *receive* signals from 5 V sources. To drive a 5 V bus, a level-shifting buffer or open-drain interface with pull-up is required.

What is the thermal resistance (θ_JA) of the TSSOP14 package?

The datasheet does not specify θ_JA for SOT402-1 (TSSOP14); however, typical values for this package with standard JEDEC 2-layer board layout are ~160 °C/W. For thermal design, use the maximum power dissipation of 500 mW (from limiting values) and ambient temperature derating curves in Section 9 of the datasheet to ensure junction temperature remains below 150 °C.