Nexperia USA Inc. 74HCT125DB,112

Overview

74HCT125DB,112 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating from 4.5 V to 5.5 V supply, featuring 15 ns typical propagation delay (VCC = 4.5 V, CL = 50 pF), ±6 mA output drive, and -40 °C to +125 °C industrial temperature range - used for bus isolation and signal routing in digital logic systems.

For engineers reviewing the 74HCT125DB,112 datasheet, 74HCT125DB,112 pinout, 74HCT125DB,112 application, or 74HCT125DB,112 equivalent, key selection criteria include TTL-level input compatibility, 3-state enable timing (15 ns enable/disable), SO14 package footprint, and guaranteed operation across extended temperature and supply voltage ranges.

Technical Context

This device implements four independent non-inverting buffers, each with an active-low 3-state output enable (nOE) controlling high-impedance output states. Inputs accept standard TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), ensuring interoperability with legacy 5 V logic families.

Each buffer delivers rail-to-rail CMOS output swing with VOH ≥ 3.98 V and VOL ≤ 0.26 V under 6 mA load, while maintaining low ICC (≤ 8 μA typical) and high noise immunity (≥ 400 mV noise margin at VCC = 5 V). The design supports hot-swap-capable bus interfacing via controlled enable/disable transitions.

Key Specifications

Pinout & Package

74HCT125DB,112 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width - compatible with standard SOIC-14 footprints and reflow soldering profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT125DB,112, the PW variant trades thermal performance for miniaturization, while the SN74HCT125DR offers equivalent functionality with minor input threshold variance - both require verification of board layout and timing margins before substitution.

Availability

74HCT125DB,112 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74HCT125DB,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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74HCT series targets industrial and consumer digital systems needing TTL-compatible inputs with CMOS output characteristics - designed for robustness in noisy environments and long-term supply stability.

FAQ

What is the maximum clock frequency supported by 74HCT125DB,112?

The device does not operate on a clock; it is combinational logic. Its usable signal rate depends on propagation delay (15 ns typical) and load capacitance. With 50 pF load, it reliably handles data edges up to ~33 MHz (1/(2 × 15 ns)), assuming clean signal integrity and proper termination.

Can 74HCT125DB,112 drive a 100 Ω transmission line directly?

No - its ±6 mA output drive is insufficient for 100 Ω line termination at 5 V (requiring ±50 mA). It can drive such lines only with external series termination or buffer amplification. For point-to-point routing with <30 pF load, it performs optimally without added components.

Is 74HCT125DB,112 pin-compatible with 74HC125 variants?

Yes - identical pinout and function across HC/HCT families. However, 74HC125 uses CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V), so substituting it for 74HCT125DB,112 in TTL-driven systems risks logic misreads unless input voltages exceed 3.15 V.

Does 74HCT125DB,112 support hot insertion into a live backplane?

It features input clamp diodes and specified absolute maximum ratings (±20 mA clamping current), allowing safe hot insertion *if* current-limiting resistors (≥ 100 Ω) are placed in series with all inputs. Without external current limiting, live insertion may exceed IOK limits and cause latch-up.