Nexperia USA Inc. 74LVC1G123GS,115

Overview

74LVC1G123GS,115 from Nexperia is a single retriggerable monostable multivibrator with Schmitt trigger inputs, used for precise pulse generation and timing extension in mixed-voltage digital systems. It supports 1.65 V to 5.5 V supply, delivers ±24 mA output drive at 3.0 V, features IOFF power-down protection, and operates across –40 °C to +125 °C - deployed in industrial sensor interface timing control.

For engineers reviewing the 74LVC1G123GS,115 datasheet, 74LVC1G123GS,115 pinout, 74LVC1G123GS,115 application, or 74LVC1G123GS,115 equivalent, key selection considerations include retriggerable pulse width control via REXT/CEXT, dual-edge triggering (A/B), direct reset (CLR), Schmitt-trigger noise immunity, and XSON8 package compatibility with high-density PCB layouts.

Technical Context

The device implements a CMOS-based retriggerable monostable architecture where output pulse width is programmable via external REXT and CEXT components, with typical tW ranging from 1.2 μs (CEXT = 100 pF, REXT = 10 kΩ) to 1.05 ms (CEXT = 0.1 μF). Retriggering on A (negative edge) or B (positive edge) extends Q HIGH duration indefinitely, while CLR provides asynchronous reset or positive-edge trigger capability.

Schmitt-trigger inputs ensure robust operation with slow-rising/falling signals (Δt/ΔV ≤ 1 ms/V), and IOFF circuitry disables outputs during partial power-down to prevent backflow current. Input voltage tolerance up to 5.5 V enables level translation between 3.3 V and 5 V logic domains without external components.

Key Specifications

Pinout & Package

XSON8 package (SOT1203): 1.35 × 1.0 × 0.35 mm, no leads, 8-terminal surface-mount design optimized for space-constrained applications and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC1G123GN, the GS offers marginally better thermal dissipation (3.6 mW/K vs. 4.2 mW/K derating), while SN74LVC1G123DBVR sacrifices IOFF, temperature rating, and pinout flexibility - making GS optimal for industrial and automotive timing-critical applications.

Availability

74LVC1G123GS,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive power sequencing, motor control fault latching, and IoT edge node watchdog extension requiring stable component supply and extended temperature performance.

Supply support for 74LVC1G123GS,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 delivering high-performance, reliable logic, discrete, and MOSFET solutions with focus on efficiency, miniaturization, and automotive-grade reliability.

The 74LVC1G123 belongs to Nexperia's LVC logic family - engineered for low-voltage, high-noise-immunity timing functions in space-constrained, thermally demanding applications such as automotive ECUs and industrial PLCs.

FAQ

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

The datasheet specifies stable operation down to CEXT = 10 pF with REXT = 5 kΩ at VCC = 4.5–5.5 V, yielding tW ≈ 20 ns. Below 10 pF, parasitic capacitance dominates, causing timing inaccuracy; for reliable design, use ≥100 pF with appropriate REXT scaling per Figure 11–13.

Can the 74LVC1G123GS,115 be used without an external capacitor?

No - CEXT is mandatory for basic monostable operation. The device requires CEXT connected between pins 6 and 7 (REXT/CEXT) to set the timing constant. Omitting CEXT results in undefined or non-functional pulse width behavior; even minimal values (e.g., 10 pF) must be physically installed.

How does the CLR pin function as both reset and trigger input?

CLR performs two distinct roles: a LOW-going edge forces Q LOW immediately (reset), while a HIGH-going edge initiates a new output pulse (trigger). This dual behavior is enabled by internal gating - confirmed in Table 4 and functional diagram Fig. 2 - allowing flexible control without additional logic.

Is the 74LVC1G123GS,115 compatible with 1.8 V microcontroller I/O?

Yes - the device is fully specified from 1.65 V to 5.5 V, and its Schmitt-trigger inputs accept VI = 0–5.5 V regardless of VCC. At VCC = 1.8 V, VT+ is 0.72–1.22 V and VT− is 0.56–1.04 V, ensuring reliable recognition of 1.8 V logic levels with 160–295 mV hysteresis.