NXP Semiconductors N74F125N,602

Overview

N74F125N,602 from NXP Semiconductors is a quad non-inverting 3-state buffer IC used for bus driving and signal isolation in TTL-compatible digital systems. It features four independent buffer channels, active-low output enable inputs (1OE–4OE), 5 V nominal supply operation, ±15 mA HIGH-level and 64 mA LOW-level output drive, and DIP14 plastic dual in-line packaging. It enables selective bus connection in data multiplexing applications.

For engineers reviewing the N74F125N,602 datasheet, N74F125N,602 pinout, N74F125N,602 application, or N74F125N,602 equivalent, key selection criteria include 3-state output timing (tPLH ≤ 6.5 ns), input loading (20 µA HIGH/LOW), output current capability (64 mA sink), and compatibility with standard 5 V TTL logic families.

Technical Context

The N74F125N,602 implements four identical non-inverting buffer stages, each with an independent active-low 3-state enable control. Each channel accepts TTL-level inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and delivers rail-referenced CMOS/TTL-compatible outputs with defined VOH ≥ 2.4 V (IOH = −3 mA) and VOL ≤ 0.55 V (IOL = 64 mA).

Propagation delays are tightly specified across temperature: tPLH/tPHL range from 2.0–6.5 ns and 3.0–8.0 ns respectively; enable/disable transitions (tPZH, tPLZ, tPHZ, tPLZ) span 1.5–9.0 ns. All timing referenced to VM = 1.5 V threshold under 50 pF load and 500 Ω termination.

Key Specifications

Pinout & Package

Package: Plastic dual in-line package, 14 leads (300 mil), SOT27-1 outline per NXP specification. Body dimensions: 19.5 mm × 6.48 mm × 3.60 mm (L × W × H), 0.254 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with N74F125N,602, SN74F125N offers identical performance and fit, while 74ACT125PC delivers faster switching and lower quiescent current but demands stricter input voltage compliance - making it a functional alternative only with design-level validation.

Availability

N74F125N,602 is available at Aetrix Electronics and suitable for industrial control panels, legacy computer upgrades, and test equipment requiring stable component supply with long-term DIP14 through-hole availability.

Supply support for N74F125N,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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions, automotive electronics, and industrial control ICs.

The 74F logic family, including N74F125N,602, was designed for high-speed TTL-compatible digital systems requiring robust noise immunity, predictable timing, and broad interoperability across legacy and mixed-voltage platforms.

FAQ

What is the maximum operating supply voltage for N74F125N,602?

The absolute maximum supply voltage for N74F125N,602 is +7.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this range risks parametric shift or permanent damage, especially above 5.5 V where internal clamp diodes may conduct excessively. N74F125N,602 must be powered within 4.5–5.5 V for guaranteed timing, drive strength, and reliability per its product data sheet Rev. 3.

Does N74F125N,602 support 3.3 V logic inputs?

Yes, N74F125N,602 accepts 3.3 V logic HIGH inputs reliably: its VIH specification is ≥2.0 V, and 3.3 V exceeds that threshold with margin. However, ensure the 3.3 V source can drive the 20 µA input current required in the HIGH state. N74F125N,602 does not require level translation for 3.3 V → 5 V interfacing, provided VCC remains at 5 V and input current capability is verified.

What is the thermal limit for continuous operation of N74F125N,602?

The maximum junction temperature for N74F125N,602 is 150 °C, and the ambient operating range is 0 °C to +70 °C. Under worst-case conditions (VCC = 5.5 V, all outputs sinking 64 mA), total power dissipation reaches ~220 mW. With typical DIP14 thermal resistance (RθJA ≈ 60 °C/W), junction temperature rise is ~13 °C above ambient - well within limits. N74F125N,602 remains thermally safe in standard free-air conditions without heatsinking.

Can N74F125N,602 outputs drive a 50 Ω transmission line directly?

No - N74F125N,602 is not designed for 50 Ω line driving. Its output structure targets TTL bus loads (typically > 500 Ω), with VOL specified at 64 mA into a resistive load, not a 50 Ω impedance. Attempting direct 50 Ω termination causes excessive current draw (>100 mA), violating IOL ratings and risking output stage failure. For transmission line use, N74F125N,602 should feed a dedicated line driver or series-terminate with appropriate resistor values.

Is N74F125N,602 pin-compatible with other 74F-series quad buffers?

Yes - N74F125N,602 shares identical pinout and function with all standard 74F125 variants (e.g., SN74F125N, DM74F125N) across manufacturers. Pin 1 (1OE) through pin 14 (VCC) map identically, and electrical behavior (timing, drive, thresholds) is aligned per F-family specifications. This enables direct substitution among 74F125 parts regardless of brand, provided package type (DIP14) matches.