Diodes Incorporated 74LVC1G125W5-7

Overview

74LVC1G125W5-7 from Diodes Incorporated is a single non-inverting 3-state buffer IC designed for voltage-level shifting and bus isolation in mixed-voltage digital systems. It operates from 1.65V to 5.5V, tolerates 5.5V inputs, delivers ±24mA output drive at 3.3V, and features IOFF circuitry for partial power-down protection-enabling use in portable computing and peripheral interfaces.

For engineers reviewing the 74LVC1G125W5-7 datasheet, 74LVC1G125W5-7 pinout, 74LVC1G125W5-7 application, or 74LVC1G125W5-7 equivalent, key selection criteria include its 1.65–5.5V supply range, 5.5V-tolerant inputs, 3.3V-compatible output drive, IOFF-enabled power-down isolation, and SOT25 package footprint compatibility with space-constrained PCB layouts.

Technical Context

This device implements a CMOS-based non-inverting buffer with active-low 3-state output control (OE). Its IOFF functionality disables both output paths during power-down, preventing backflow current when VCC = 0V while inputs or outputs remain biased.

The logic function follows a simple truth table: when OE = LOW, Y = A; when OE = HIGH, Y = high-impedance. Input thresholds scale with VCC (e.g., VIH ≥ 0.7×VCC at 4.5–5.5V), ensuring reliable interfacing across 1.8V, 2.5V, 3.3V, and 5V domains.

Key Specifications

Pinout & Package

SOT25 (3.0mm × 2.8mm × 1.2mm, 0.95mm lead pitch) - compact 5-pin surface-mount package with exposed pad option (not electrically connected), optimized for automated placement and thermal performance in dense layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-state buffer applications.

Compared with SN74LVC1G125DBVR and 74AUP1G125GW,125, the 74LVC1G125W5-7 offers superior thermal performance in SOT25, balanced drive strength for multi-load interfaces, and tighter IOFF leakage control-making it optimal for thermally constrained, mixed-voltage embedded designs requiring reliability across automotive and industrial temperature ranges.

Availability

74LVC1G125W5-7 is available at Aetrix Electronics and suitable for USB peripheral isolation, mobile SoC power-gating interfaces, and industrial sensor hub level shifting requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 74LVC1G125W5-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient components for computing, industrial, and automotive markets.

The 74LVC logic family targets low-voltage, mixed-supply digital interfacing with emphasis on power efficiency, voltage tolerance, and robustness in portable and embedded systems.

FAQ

What is the maximum operating temperature for continuous use?

The 74LVC1G125W5-7 is rated for continuous operation from –40°C to +125°C ambient temperature. Junction temperature must not exceed +150°C; with θJA = 204°C/W in SOT25, sustained 24mA output loading requires board-level thermal design limiting power dissipation to ≤125mW under worst-case conditions.

Can OE be left floating in circuit design?

No. OE must be actively driven HIGH or LOW; floating OE may cause undefined output states and increased ICC due to input stage instability. Per datasheet Note 9, unused inputs-including OE-must be tied to VCC or GND via ≤10kΩ resistor to ensure predictable 3-state behavior and avoid shoot-through current.

Does this device support hot insertion into a live backplane?

Yes-when used with proper sequencing. The 5.5V-tolerant inputs and IOFF circuitry allow safe connection while VCC is off, provided OE is held HIGH (disabling output) until VCC stabilizes. Backplane voltage must not exceed absolute maximum ratings (–0.5V to 6.5V on any pin), and slew rate must stay within 5–20 ns/V depending on VCC.

How does IOFF behave when VCC = 0V but inputs are at 3.3V?

IOFF activates automatically when VCC drops below ~0.8V, disabling both output FETs regardless of OE state. At VCC = 0V and VI = 3.3V, output leakage remains ≤±200μA, preventing damaging reverse current into the powered-down IC-verified per JEDEC JESD78 latch-up testing at 100mA.