NXP Semiconductors N74F260D,623

Overview

N74F260D,623 from Philips Semiconductors is a dual 5-input NOR gate logic IC in a 14-pin plastic SO package (SOT108-1), delivering 3.5 ns typical propagation delay and 6 mA typical total supply current at V_CC = 5 V. It operates across 0°C to +70°C with guaranteed 2.7 V high-level output voltage and 0.5 V low-level output voltage under load, serving as a high-speed combinational logic building block in TTL-compatible digital control systems.

For engineers reviewing the N74F260D,623 datasheet, N74F260D,623 pinout, N74F260D,623 application, or N74F260D,623 equivalent, key selection criteria include verified 5-input NOR functionality per gate, SO-14 thermal and layout compatibility, fan-out capability of 50/33 (high/low), absolute maximum V_CC = +7.0 V, and I_OL = 20 mA drive strength for industrial bus interface and address decoding.

Technical Context

The N74F260D,623 implements two independent 5-input NOR gates using bipolar F-type (fast TTL) technology, with totem-pole outputs and no internal pull-ups or open-collector configuration. Each gate accepts five inputs (Dna–Dne) and produces one inverting output (Qn), supporting full Boolean NOR truth table behavior including "don't care" input handling.

It meets IEC/IEEE standard logic symbol conventions and complies with FAST TTL electrical loading definitions: 1.0 unit load = 20 µA high / 0.6 mA low. Input clamp voltage is –1.2 V, and short-circuit output current is rated up to –150 mA, confirming robust transient immunity in noisy digital environments.

Key Specifications

Pinout & Package

Package: 14-pin plastic small outline (SO), body width 3.9 mm, SOT108-1 footprint - RoHS-compliant, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 5-input NOR gate applications.

Compared with SN74F260N and 74ACT260SCX, the N74F260D,623 offers optimal balance of SMT manufacturability, proven FAST TTL timing, and legacy system compatibility-making it preferred for volume production of industrial controllers where DIP sockets are impractical and CMOS transition is not yet justified.

Availability

N74F260D,623 is available at Aetrix Electronics and suitable for memory address decoding, bus arbitration logic, and programmable logic glue applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for legacy system sustainment.

Supply support for N74F260D,623 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 product families with rigorous industrial qualification.

The 74F logic series-including the N74F260D,623-was engineered for high-speed, low-power digital control in telecommunications infrastructure, test equipment, and industrial automation systems demanding reliable 5 V logic interoperability.

FAQ

What logic family does the N74F260D,623 belong to, and how does it differ from standard 74LS devices?

The N74F260D,623 belongs to the 74F (FAST TTL) logic family. It differs from 74LS by offering approximately 3× faster propagation delay (3.5 ns vs ~10 ns), higher output drive (20 mA vs 8 mA), and greater input noise immunity (V_IH = 2.0 V vs 1.7 V). Unlike 74LS, the N74F260D,623 uses Schottky-clamped transistors to minimize saturation delay, making it suitable for higher-frequency digital control paths where timing closure is critical.

Can the N74F260D,623 be used in place of a 74HC260 in a 5 V system?

No-the N74F260D,623 is not a drop-in replacement for the 74HC260. While both implement dual 5-input NOR functions, the N74F260D,623 is TTL-compatible with 0.8 V/2.0 V input thresholds and totem-pole outputs, whereas the 74HC260 is CMOS with rail-to-rail input thresholds and higher input impedance. Interfacing them directly risks incorrect logic levels or excessive current draw; level-shifting or redesign is required for substitution.

What is the maximum allowable output short-circuit duration for the N74F260D,623?

The N74F260D,623 specifies a short-circuit output current (I_OS) of –60 mA to –150 mA at V_CC = 5.5 V, but Philips explicitly warns that short-circuit testing should be performed last in any test sequence and limited in duration to avoid internal heating. Continuous short-circuit operation is not recommended; the device is not designed for sustained fault conditions, and prolonged shorts may degrade reliability or cause permanent damage.

Does the N74F260D,623 support mixed-voltage operation, such as interfacing with 3.3 V logic?

The N74F260D,623 is specified only for V_CC = 4.5 V to 5.5 V and does not guarantee correct operation with 3.3 V inputs. Its V_IL = 0.8 V and V_IH = 2.0 V thresholds mean 3.3 V logic outputs (typically 3.3 V high) exceed V_IH and are acceptable, but 3.3 V logic inputs may fail to register as valid HIGH due to insufficient voltage margin. For reliable 3.3 V ↔ 5 V interfacing, external level translators or buffer ICs are required.

Is the N74F260D,623 still in active production, and what is its obsolescence status?

The N74F260D,623 is a legacy part originally manufactured by Philips Semiconductors and later supported by NXP. It is no longer in active production but remains available through authorized distributors and Aetrix Electronics' long-term inventory program. Aetrix provides lifecycle availability coordination, last-time-buy planning, and cross-reference support to ensure continuity for industrial and defense customers maintaining legacy systems.