Nexperia USA Inc. 74LVC1G123GF,115

Overview

74LVC1G123GF,115 from Nexperia is a single retriggerable monostable multivibrator with Schmitt trigger inputs, used for precise pulse generation and timing extension in digital control paths. 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 timing, power sequencing supervision, and legacy bus signal conditioning.

For engineers reviewing the 74LVC1G123GF,115 datasheet, 74LVC1G123GF,115 pinout, 74LVC1G123GF,115 application, or 74LVC1G123GF,115 equivalent, key selection criteria include retriggerable pulse extension capability, IOFF power-down protection, Schmitt-trigger noise immunity, and compatibility across 3.3 V/5 V mixed-voltage systems.

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 on each A (negative-edge) or B (positive-edge) trigger event. Pulse termination is achieved via active-Low CLR, which also inhibits new triggers.

Schmitt-trigger inputs provide hysteresis (e.g., 199 mV typical at 5 V), enabling robust operation with slow-rising signals. The IOFF circuit disables outputs during power-down, preventing backflow current - critical for hot-swap and partial-power-down systems.

Key Specifications

Pinout & Package

XSON8 package: plastic extremely thin small outline, no leads, 8 terminals, body size 1.2 × 1.0 × 0.35 mm (SOT1116), moisture sensitivity level 1, lead-free and RoHS compliant.

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 74LVC1G123GF,115 uniquely combines 5 V-tolerant inputs, independent CEXT routing, and ±24 mA drive in an ultra-compact XSON8 package - making it optimal for space-constrained, mixed-voltage industrial timing.

Availability

74LVC1G123GF,115 is available at Aetrix Electronics and suitable for industrial power sequencing, automotive sensor wake-up, and legacy bus signal conditioning requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVC1G123GF,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 essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVC1G123 belongs to Nexperia's LVC logic family - engineered for low-voltage operation, high noise immunity, and robust mixed-signal interfacing in demanding real-world applications.

FAQ

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

The datasheet specifies stable operation down to CEXT = 10 pF with REXT = 5 kΩ at VCC = 4.5–5.5 V, yielding tW ≈ 2.5 ns. Below 10 pF, parasitic capacitance dominates, causing deviation from calculated pulse width. For reliable design, use CEXT ≥ 100 pF with appropriate PCB layout to minimize stray capacitance.

Can the 74LVC1G123GF,115 be used with a 1.8 V supply while interfacing to 3.3 V GPIOs?

Yes. Inputs accept voltages up to 5.5 V regardless of VCC, so 3.3 V GPIOs safely drive A, B, or CLR. At VCC = 1.8 V, VOH is guaranteed ≥ 1.7 V (IO = –4 mA), sufficient to meet VIH of most 1.8 V logic families. Output drive remains functional, though reduced to ±12 mA.

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

CLR performs two distinct roles: (1) As active-Low reset, pulling CLR LOW terminates Q HIGH immediately; (2) As positive-edge trigger, a rising edge on CLR initiates a new output pulse - enabled by internal connection from CLR to input gates. This dual behavior is inherent to the logic diagram and requires no external configuration.

Is the 74LVC1G123GF,115 pin-compatible with other 74LVC1G123 variants in different packages?

No. While functionally identical, the 74LVC1G123GF,115 uses SOT1116 (XSON8) with 8 terminals in 1.2 × 1.0 mm footprint, whereas TSSOP8 (SOT505-2) and VSSOP8 (SOT765-1) have different pinouts - notably, CEXT and REXT/CEXT positions differ. PCB layout must match the specific package variant ordered.