Diodes Incorporated 74LVC125AT14-13

Overview

74LVC125AT14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-low output enable (OE) control per channel, operating from 1.65V to 5.5V supply, supporting 5.5V-tolerant inputs for mixed-voltage level shifting in logic interfacing applications. It delivers ±24mA drive strength at 3.3V, features IOFF partial-power-down protection, and is qualified in TSSOP-14 package for space-constrained PCBs.

For engineers reviewing the 74LVC125AT14-13 datasheet, 74LVC125AT14-13 pinout, 74LVC125AT14-13 application, or 74LVC125AT14-13 equivalent, this device is selected for voltage translation between 1.8V/2.5V/3.3V and 5V domains, bus isolation during power sequencing, and general-purpose 3-state logic buffering where low static current (<10µA ICC), fast propagation delay (2.5ns typ @3.3V), and robust ESD protection (2kV HBM) are required.

Technical Context

The 74LVC125AT14-13 implements four non-inverting buffers, each with dedicated active-low OE input enabling independent high-impedance control of outputs. Its IOFF circuitry actively disables outputs when VCC = 0V, preventing back-current flow in partial-power-down systems.

Input thresholds scale with VCC (VIH = 0.65×VCC min), ensuring reliable operation across 1.65–5.5V supply range. Output drive capability is specified at ±24mA sink/source, with VOL ≤0.55V and VOH ≥VCC–0.3V under load, supporting TTL- and CMOS-compatible signaling.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, thin-profile surface-mount with exposed pad not present. RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWR and 74LVC125PW,118, the 74LVC125AT14-13 offers superior high-temperature performance (125°C vs 85°C), tighter propagation delay, and lower quiescent current-making it optimal for industrial control and high-reliability embedded systems where thermal margin and timing precision are critical.

Availability

74LVC125AT14-13 is available at Aetrix Electronics and suitable for PCIe slot power sequencing, USB hub signal isolation, and industrial PLC I/O expansion requiring stable component supply, long-lifecycle availability, and consistent TSSOP-14 packaging.

Supply support for 74LVC125AT14-13 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 industrial, computing, and communications markets.

The 74LVC logic family targets low-voltage, mixed-supply digital interfacing-designed specifically for voltage translation, bus isolation, and power-aware signal routing in space- and power-constrained systems.

FAQ

Can 74LVC125AT14-13 operate with VCC = 1.8V while accepting 3.3V inputs?

Yes. The device supports 1.65V–5.5V VCC and has 5.5V-tolerant inputs, so 3.3V signals applied to A pins are safe at VCC = 1.8V. Input thresholds scale with VCC (VIH ≥0.65×VCC), ensuring correct logic interpretation without external clamping.

What is the maximum capacitive load this buffer can drive reliably?

At VCC = 3.3V, the 74LVC125AT14-13 maintains ≤4.6ns typical propagation delay into 50pF loads (per datasheet Figure 1 test condition). For heavier loads (>75pF), rise/fall times increase but remain functional up to 100pF with marginal timing margin loss.

Does the IOFF feature require external pull-up/pull-down resistors on OE pins?

No. OE pins are CMOS-compatible with rail-to-rail logic thresholds. When VCC = 0V, IOFF activates automatically-no external biasing needed. During normal operation, OE should be driven actively high/low; floating OE is undefined and must be avoided.

Is thermal derating required for continuous operation at 125°C ambient?

Yes. With θJA = 159°C/W (TSSOP-14), power dissipation must be limited to ≤(125°C – 25°C)/159 ≈ 630mW to keep junction temperature ≤150°C. At typical ICC <40µA and I/O switching, actual dissipation remains well below this limit.