NXP Semiconductors N74F125D,602

Overview

N74F125D,602 from Philips Semiconductors is a quad 3-state non-inverting buffer IC with active-low output enable inputs, designed for bus interface and data routing in TTL-compatible digital systems. It delivers 5.0 ns typical propagation delay, ±15 mA high-level and 64 mA low-level output drive, and operates at 5.0 V ±10% over 0°C to +70°C.

For engineers reviewing the N74F125D,602 datasheet, N74F125D,602 pinout, N74F125D,602 application, or N74F125D,602 equivalent, key selection criteria include 3-state bus driving capability, input loading of 20 µA (High/Low), output fan-out of 750/106.7 FAST unit loads, and SO-14 package compatibility with legacy 74F logic designs.

Technical Context

The N74F125D,602 implements four independent non-inverting buffers, each with dedicated active-low output enable (OE) control-enabling selective bus connection without contention. Its bipolar FET (F) process ensures TTL-level compatibility while supporting fast switching and high noise immunity.

Each buffer features high-impedance NPN base inputs (20 µA loading in both logic states) and rail-to-rail output capability under specified I_OH/I_OL conditions. Output disable timing (t_PHZ/t_PLZ) is guaranteed ≤5.5 ns, and enable timing (t_PZH/t_PZL) ≤8.0 ns across temperature and voltage extremes.

Key Specifications

Pinout & Package

Package: SO-14 (plastic small outline, 14-lead, 3.9 mm body width, SOT108-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F125N and 74ACT125M, the N74F125D,602 uniquely balances SO-14 surface-mount compatibility, full 74F drive strength, and proven reliability in long-lifecycle commercial systems-making it optimal for repair, replacement, and continuity builds where original 74F performance and footprint are mandatory.

Availability

N74F125D,602 is available at Aetrix Electronics and suitable for microprocessor bus interface, memory address latching, and peripheral I/O expansion requiring stable component supply and long-term obsolescence management.

Supply support for N74F125D,602 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

Philips Semiconductors (now NXP Semiconductors) was a leading European semiconductor manufacturer known for pioneering TTL, CMOS, and analog ICs from the 1960s through the 1990s.

The 74F logic family-including N74F125D,602-was engineered for high-speed, low-power bipolar digital systems in computing, instrumentation, and industrial control, emphasizing compatibility, noise margin, and thermal stability.

FAQ

What is the logic function of the N74F125D,602?

The N74F125D,602 is a quad non-inverting buffer with individual active-low 3-state output enable inputs (OE0–OE3). When an OE pin is Low, its corresponding Q output follows the D input; when OE is High, Q enters high-impedance state. This behavior is defined in the 74F125 function table and confirmed in Philips' 1989 product specification.

Does the N74F125D,602 support 5 V TTL-level signaling?

Yes, the N74F125D,602 is fully compliant with TTL voltage thresholds: V_IL ≤ 0.8 V, V_IH ≥ 2.0 V, V_OL ≤ 0.55 V, and V_OH ≥ 2.4 V at I_OL = 15 mA. These values are specified in the DC Electrical Characteristics table of the official Philips datasheet for N74F125D,602.

What is the maximum output sink current for the N74F125D,602?

The N74F125D,602 supports a guaranteed minimum low-level output current (I_OL) of 64 mA per channel, as specified under recommended operating conditions (V_CC = 4.5–5.5 V, T_amb = 0°C to +70°C). This rating enables direct drive of multiple TTL inputs or moderate-current loads without external transistors.

Is the N74F125D,602 pin-compatible with the 74F126 variant?

No-the N74F125D,602 uses active-low output enables (OE), whereas the 74F126 has active-high OEs. Though pinout and package are identical, the logic polarity difference means direct substitution requires inverting the OE control signal; the N74F125D,602 cannot function as a drop-in replacement for 74F126 in existing designs.

What package type does the N74F125D,602 use?

The N74F125D,602 uses a plastic small outline package with 14 leads and 3.9 mm body width (SOT108-1), commonly referred to as SO-14. This surface-mount package is documented in Philips' ordering information and mechanical drawings for the 74F125 family.