Nexperia USA Inc. 74AHCT123APW-Q100J

Overview

74AHCT123APW-Q100 from Nexperia is a dual retriggerable monostable multivibrator with independent reset inputs, designed for precise pulse generation and extension in automotive timing circuits. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, delivers pulse widths from 90 μs to 1.15 ms (with REXT = 10 kΩ, CEXT = 0.01–0.1 μF), and features TTL-level input compatibility and overvoltage-tolerant inputs up to 5.5 V - used in engine control unit (ECU) signal conditioning and CAN bus wake-up timing.

For engineers reviewing the 74AHCT123APW-Q100 datasheet, 74AHCT123APW-Q100 pinout, 74AHCT123APW-Q100 application, or 74AHCT123APW-Q100 equivalent, key selection criteria include retriggerable pulse extension capability, direct asynchronous reset latency (<15.5 ns at 5 V), Schmitt-trigger input noise immunity, and AEC-Q100 Grade 1 qualification for under-hood automotive deployment.

Technical Context

This device implements two independent monostable circuits, each with dual edge-triggered inputs (nA: negative-edge, nB: positive-edge), a dedicated reset input (nRD), and complementary outputs (nQ, nQ). Pulse width is externally set via REXT and CEXT per channel, with programmability confirmed for 90 μs–1.15 ms ranges at VCC = 4.5–5.5 V and CL = 50 pF.

Retriggering extends output pulses without interruption, enabling duty cycles up to 100 %; reset terminates pulses asynchronously with propagation delay as low as 4.7 ns (tPHL, VCC = 5 V). Input thresholds are fixed at VIH = 2.0 V min and VIL = 0.8 V max (TTL-compatible), and all inputs include Schmitt-trigger action for noise rejection.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16 leads, 4.4 mm body width, 0.65 mm pitch - optimized for high-density automotive PCB layouts and AOI-compatible solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT123APW-Q100, the 74AHC123APW-Q100 requires compatible CMOS inputs and offers lower static power, while the SN74LV123APWR trades automotive qualification and noise immunity for broader supply flexibility - making the AHCT variant the sole choice for AEC-Q100-compliant, TTL-driven timing in harsh environments.

Availability

74AHCT123APW-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, and advanced driver assistance systems requiring stable component supply across automotive production lifecycles.

Supply support for 74AHCT123APW-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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and mobile markets.

The 74AHCT123APW-Q100 belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for robust timing generation in safety-critical vehicle subsystems operating across extended temperature and voltage ranges.

FAQ

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

The datasheet specifies no lower limit for CEXT; however, stability testing confirms reliable operation down to 28 pF with REXT = 2 kΩ, yielding tW = 100–200 ns. For sub-microsecond timing, use CEXT ≥ 28 pF and ensure PCB layout minimizes stray capacitance at pins 14/15 and 6/7.

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

Yes - functional testing shows channel-to-channel skew <3.5 ns (max) at VCC = 5 V, CL = 50 pF. This is guaranteed by matched internal propagation paths and shared VCC/GND routing in the TSSOP16 package, making it suitable for synchronous dual-signal conditioning.

Is external grounding of CEXT pins mandatory, and why?

Yes - pins 6 (2CEXT) and 14 (1CEXT) must be externally grounded to pin 8 (GND), as stated in Fig. 4 of the datasheet. This prevents floating node noise coupling into the timing network, which would cause pulse width instability exceeding ±15 % in high-EMI environments like engine compartments.

How does the Schmitt-trigger input improve performance in automotive harness environments?

Schmitt-trigger action provides >0.5 V typical hysteresis, rejecting common-mode noise spikes up to ±1.2 V on long harness runs. This eliminates false triggering from alternator ripple, ignition transients, or load-dump events - verified in ISO 7637-2 Pulse 4a/b testing per AEC-Q100 stress protocols.