Nexperia USA Inc. 74LVT125DB,112

Overview

74LVT125DB,112 from Nexperia is a 3.3 V quad non-inverting 3-state buffer with bus-hold inputs and IOFF partial power-down protection, operating from 2.7 V to 3.6 V supply, delivering ±32 mA/±64 mA output drive, and specified for -40 °C to +85 °C industrial temperature range. It serves as a level-translating bus interface in high-speed digital systems such as backplane data routing and FPGA I/O expansion.

For engineers reviewing the 74LVT125DB,112 datasheet, 74LVT125DB,112 pinout, 74LVT125DB,112 application, or 74LVT125DB,112 equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.7 ns), overvoltage-tolerant 5.5 V inputs, bus-hold current (IBHL = 75–150 μA), and IOFF-enabled hot-swap capability in mixed-voltage systems.

Technical Context

This device implements four independent non-inverting buffers, each controlled by an active-low output enable (nOE) input that places the corresponding output in high-impedance OFF-state. The BiCMOS process enables TTL-compatible input thresholds while supporting 3.3 V logic levels and driving loads up to 50 pF at ≤4.9 ns propagation delay (VCC = 2.7 V).

Bus-hold circuitry actively maintains unused input states without external pull-ups, and the IOFF feature disables outputs during power-down to prevent backflow current when VCC = 0 V and VI/VO = 0–4.5 V. Inputs tolerate up to 5.5 V regardless of VCC, enabling safe interfacing with 5 V buses.

Key Specifications

Pinout & Package

74LVT125DB,112 is packaged in SSOP14 (SOT337-1), a plastic shrink small outline package with 14 leads, body width 5.3 mm, and standard 0.65 mm lead pitch. Pin 1 is marked by a notch or dot; the package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT125DB,112, the 74LVT125PW,118 offers identical functionality in a thinner, thermally superior package, while SN74LVC125APWR trades bus-hold and IOFF for wider VCC range and higher ESD rating - making it suitable only where those features are not required.

Availability

74LVT125DB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, telecom line card control, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT125DB,112 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 discrete components, with leadership in automotive-qualified and industrial-grade standard products.

The 74LVT series targets high-speed 3.3 V digital interfacing, emphasizing robustness in mixed-voltage systems, hot-swap readiness, and minimal external component count for bus buffering and signal conditioning.

FAQ

What is the maximum input voltage the 74LVT125DB,112 can tolerate?

The 74LVT125DB,112 accepts input voltages up to +5.5 V regardless of VCC level, as confirmed in Table 4 (Limiting Values) and Table 5 (Recommended Operating Conditions). This overvoltage tolerance enables direct interfacing with 5 V logic families without external protection or level translation, provided input clamp current remains within ±50 mA limits.

Does the 74LVT125DB,112 support live insertion into a powered system?

Yes - the IOFF circuitry actively disables outputs and limits leakage to ±100 μA when VCC = 0 V and inputs/outputs are biased between 0 V and 4.5 V, as specified in Table 4 and Section 1. This feature permits safe hot-plug operation in backplane and modular systems without risk of back-current damage.

How does bus-hold functionality eliminate external pull-up resistors?

Each input incorporates a weak feedback transistor pair that sources or sinks 75–150 μA to hold the pin at its last valid logic state when floating. As documented in Table 6 (IBHL/IBHH), this internal current exceeds typical CMOS input leakage, making external 10 kΩ pull-ups unnecessary for unused or unterminated inputs - reducing component count and layout complexity.

What is the worst-case propagation delay from input to output?

The maximum tPLH/tPHL is 4.9 ns at VCC = 2.7 V and Tamb = -40 °C to +85 °C, per Table 7. At nominal 3.3 V operation and 25 °C, typical delay is 2.7 ns. This value is measured under loaded conditions (50 pF, 500 Ω), ensuring real-world timing margin for 100 MHz bus designs.