Nexperia USA Inc. 74LVC1G123DC,125

Overview

74LVC1G123DC,125 from Nexperia is a single retriggerable monostable multivibrator with Schmitt trigger inputs, used for precise pulse generation and timing control in digital systems. It supports 1.65 V to 5.5 V supply, offers ±24 mA output drive at 3.0 V, enables programmable pulse width via external REXT/CEXT, and features direct reset (CLR) and dual-edge triggering (A/B). It is deployed in industrial sensor interface circuits requiring noise-immune, extendable timing pulses.

For engineers reviewing the 74LVC1G123DC,125 datasheet, 74LVC1G123DC,125 pinout, 74LVC1G123DC,125 application, or 74LVC1G123DC,125 equivalent, key selection considerations include retriggerable pulse extension capability, IOFF power-down protection, Schmitt-triggered input hysteresis, and VSSOP8 package compatibility with high-density PCB layouts.

Technical Context

The device implements a CMOS-based retriggerable monostable architecture where output pulse width is set by external REXT and CEXT components and dynamically extended via A (negative-edge) or B (positive-edge) retriggering. Pulse termination is achieved through a dedicated active-Low CLR input that also accepts positive-edge triggering for flexible reset control.

Schmitt-triggered inputs provide hysteresis (e.g., 170 mV typical at 1.8 V), enabling robust operation with slow-rising signals. The IOFF circuit disables outputs during partial power-down, preventing backflow current - critical for mixed-voltage system interoperability and hot-swap safety.

Key Specifications

Pinout & Package

VSSOP8 plastic very thin shrink small outline package; 8 leads; body width 2.3 mm; lead pitch 0.5 mm; JEDEC MO-187 compliant (SOT765-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G123DBVR and 74AUP1G123GW,125, the 74LVC1G123DC,125 uniquely balances retriggerable flexibility, robust drive strength, IOFF safety, and mixed-voltage tolerance - making it optimal for industrial and automotive timing where reliability and configurability are paramount.

Availability

74LVC1G123DC,125 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive power sequencing, motor control fault detection, and industrial communication gate control requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVC1G123DC,125 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 logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in automotive, industrial, and consumer applications.

The 74LVC1G123 belongs to Nexperia's LVC logic family - engineered for low-voltage operation with high noise immunity and robust power-down behavior, targeting timing-critical functions in harsh environments.

FAQ

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

The datasheet specifies stable operation down to 10 pF for CEXT when paired with REXT ≥ 1 kΩ. At lower values, parasitic capacitance dominates, causing timing inaccuracy. For precision timing below 100 ns, use CEXT ≥ 100 pF and REXT ≥ 5 kΩ to maintain ±15 % pulse width tolerance across temperature and voltage.

Can the CLR pin be used simultaneously as a reset and a trigger input?

Yes - CLR is a dual-function pin: a LOW level terminates the output pulse immediately, while a LOW-to-HIGH transition triggers the monostable. These functions are mutually exclusive per cycle; the internal logic prioritizes reset when CLR is held LOW, and only recognizes rising edges when CLR is previously HIGH.

How does the IOFF feature behave during partial power-down of a multi-rail system?

When VCC = 0 V, the IOFF circuit forces all outputs (Q) into high-impedance state regardless of input states, blocking current flow from powered inputs (e.g., 5 V GPIO) into the unpowered IC. This prevents latch-up and protects upstream drivers - verified per JESD78 Class II latch-up testing (>100 mA).

Is the 74LVC1G123DC,125 compatible with 1.8 V microcontroller I/O without level shifters?

Yes - inputs accept voltages up to 5.5 V independent of VCC, and VIH/VIL thresholds scale with VCC. At VCC = 1.8 V, VIH(min) = 1.2 V and VIL(max) = 0.45 V, fully compatible with standard 1.8 V CMOS outputs. Output VOH reaches 1.7 V at 4 mA load, sufficient to drive subsequent 1.8 V logic inputs.