Nexperia USA Inc. 74HC123PW-Q100,118

Overview

74HC123PW-Q100 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, designed for precise pulse generation and timing extension in automotive systems. It operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, delivers programmable output pulse widths via external R_EXT/C_EXT, and features Schmitt-trigger inputs for noise immunity. Used in engine control unit (ECU) fault pulse stretching and transmission shift timing synchronization.

For engineers reviewing the 74HC123PW-Q100 datasheet, 74HC123PW-Q100 pinout, 74HC123PW-Q100 application, or 74HC123PW-Q100 equivalent, key selection criteria include retriggerable pulse extension capability, AEC-Q100 Grade 1 qualification, TTL/CMOS input compatibility (HC variant), and TSSOP16 package suitability for high-density automotive PCB layouts.

Technical Context

This IC implements two independent monostable circuits, each with separate negative-edge (nA) and positive-edge (nB) trigger inputs, active-low direct reset (nRD), and complementary outputs (nQ/nQ). Pulse width is determined by external R_EXT and C_EXT on pins 7 and 15 (Channel 2) and pins 6 and 14 (Channel 1), with typical t_W ranging from 75 ns (REXT = 5 kΩ, CEXT = 0 pF) to 450 μs (REXT = 10 kΩ, CEXT = 100 nF).

Each channel supports retriggering during an active output pulse to extend duration indefinitely, while nRD provides asynchronous termination. Input clamp diodes enable overvoltage tolerance, and Schmitt-trigger action on nA/nB inputs ensures robust operation with slow-rising signals - critical for noisy automotive environments.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar monostable multivibrator applications.

Compared with 74HCT123PW-Q100, the 74HC123PW-Q100 offers superior noise immunity in high-EMI engine bays due to higher VIH/VIL thresholds, while SN74LV123APWR lacks automotive qualification and cannot replace it in safety-critical vehicle systems.

Availability

74HC123PW-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and body control modules requiring stable component supply with full automotive-grade traceability and extended temperature support.

Supply support for 74HC123PW-Q100 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 delivering high-performance, reliable components optimized for automotive, industrial, and mobile applications, with leadership in logic, discrete, and MOSFET technologies.

The 74HC123PW-Q100 belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for timing-critical functions in harsh-temperature vehicle subsystems where deterministic pulse generation and AEC-Q100 compliance are mandatory.

FAQ

What is the minimum external capacitor value supported for stable pulse width programming?

The device supports C_EXT down to 0 pF (no capacitor), yielding minimum pulse widths of 75 ns at VCC = 6.0 V. For C_EXT < 50 pF, a power-up reset pulse is required to prevent spurious output; recommended practice is to use ≥100 pF for robustness against PCB stray capacitance.

Can both channels be triggered simultaneously without crosstalk or timing skew?

Yes - channels are fully independent with separate inputs, outputs, and timing networks. Measured propagation delay skew between channels is ≤2 ns (VCC = 5.0 V, CL = 15 pF), verified per datasheet Table 7, enabling synchronous dual-pulse generation for matched actuator control.

How does the reset input (nRD) interact with an ongoing retriggered pulse?

An active LOW-going edge on nRD terminates the current output pulse immediately, regardless of retrigger activity or remaining programmed duration. The output transitions within t_pd (max 65 ns at VCC = 6.0 V), and the monostable remains in reset state until next valid nA/nB trigger.

Is the TSSOP16 package (SOT403-1) compatible with standard automated optical inspection (AOI)?

No - unlike the DHVQFN variant (SOT763-1), the TSSOP16 package lacks side-wettable flanks. AOI requires solder joint visibility from the side; for full AOI support, specify 74HC123BQ-Q100 (DHVQFN16) instead.