Nexperia USA Inc. 74LVC1G123GN,115

Overview

74LVC1G123GN,115 from Nexperia is a single retriggerable monostable multivibrator with Schmitt trigger inputs, used for precise pulse generation and timing extension in digital control circuits. It operates from 1.65 V to 5.5 V, supports mixed-voltage interfacing (3.3 V/5 V), delivers ±24 mA output drive at 3.0 V, and features IOFF power-down protection. A key application is debouncing mechanical switches in industrial HMI panels.

For engineers reviewing the 74LVC1G123GN,115 datasheet, 74LVC1G123GN,115 pinout, 74LVC1G123GN,115 application, or 74LVC1G123GN,115 equivalent, this page provides verified functional behavior, XSON8 package layout, retrigger timing constraints, and direct reset interaction - all critical for reliable pulse-width control in safety-critical timing paths.

Technical Context

The device implements a dual-edge-triggered monostable architecture: input A responds to falling edges, input B to rising edges, and CLR serves as both active-Low reset and rising-edge trigger. Pulse width is externally set via REXT/CEXT (pin 7 and pin 6), with typical tW ranging from 1.2 μs (100 pF/10 kΩ) to 1.05 ms (0.1 μF/10 kΩ) depending on VCC and component values.

Its Schmitt-triggered inputs provide hysteresis (e.g., 199 mV typical at 3.3 V), enabling robust operation with slow-rising signals. The IOFF circuit ensures zero backflow current during partial power-down, satisfying JEDEC JESD78 latch-up requirements (>100 mA) and supporting hot-swap capability in modular systems.

Key Specifications

Pinout & Package

XSON8 package (SOT1116): extremely thin 1.2 × 1.0 × 0.35 mm no-lead outline with wettable flanks; optimized for high-density PCB layouts and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G123DBVR and 74AUP1G123GN,132, the 74LVC1G123GN,115 uniquely combines retriggerability, 5 V-tolerant inputs, ±24 mA drive, and industrial temperature range - making it the only option for robust, field-deployable timing control requiring hardware-level adaptability.

Availability

74LVC1G123GN,115 is available at Aetrix Electronics and suitable for industrial HMI panels, automotive body controllers, motor drive safety monitors, and FPGA power sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC1G123GN,115 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, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVC1G123 belongs to Nexperia's LVC logic family, designed specifically for low-voltage, mixed-signal interfacing with robust noise immunity and power-down safety - targeting applications where timing integrity must survive harsh electrical environments.

FAQ

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

The datasheet specifies stable operation down to CEXT = 0 pF (no capacitor), but practical minimum is 10 pF to avoid parasitic sensitivity. With REXT = 1 kΩ and VCC = 3.3 V, 10 pF yields ~10 ns pulse width - verified in dynamic characterization tables for CL = 15 pF loading. Below 10 pF, trace capacitance dominates, causing variation exceeding ±20 %.

Can CLR be used simultaneously as reset and trigger without conflict?

Yes: when CLR transitions HIGH, it triggers a new monostable pulse regardless of prior state; when driven LOW, it forces Q LOW immediately and inhibits further triggering until CLR returns HIGH. This dual behavior is explicitly defined in the function table and validated in Fig. 8 waveform diagrams - no race conditions occur due to internal synchronization.

How does IOFF behave during brown-out conditions where VCC drops to 0.8 V?

IOFF activates only when VCC = 0 V (fully powered down); at 0.8 V, the device remains in active mode with degraded but functional outputs. The IOFF circuit is not engaged during brown-out - instead, the device follows standard LVC DC characteristics down to 1.65 V minimum, per recommended operating conditions in Table 6.

Is the REXT/CEXT pin (pin 7) internally connected to both resistor and capacitor nodes?

Yes: pin 7 is internally bonded to both the REXT current source and CEXT discharge path, forming a shared terminal that simplifies external RC network layout. This topology is confirmed in Fig. 2 (logic diagram) and Fig. 10 (timing component connections), enabling single-point connection for compact PCB routing.