NXP Semiconductors N74F20N,602

Overview

N74F20N,602 from Philips Semiconductors is a dual 4-input NAND gate logic IC in a 14-pin plastic DIP package, operating at 5 V ±10% over 0°C to +70°C, with 3.5 ns typical propagation delay and 2.2 mA typical total supply current. It serves as a high-speed combinational logic building block in TTL-compatible digital control circuits, such as address decoding in legacy microprocessor systems.

For engineers reviewing the N74F20N,602 datasheet, N74F20N,602 pinout, N74F20N,602 application, or N74F20N,602 equivalent, key selection considerations include guaranteed fan-out (50/33 HIGH/LOW), IOL = 20 mA drive capability, absolute maximum VCC = +7.0 V, and compatibility with 74F-family timing and loading standards.

Technical Context

The N74F20N,602 implements two independent 4-input NAND gates using bipolar FET (Fairchild Advanced Schottky) technology, delivering TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and totem-pole output stages. Each gate accepts four logic inputs and produces one inverting output with defined DC drive strength and AC timing behavior.

Its operation adheres strictly to the 74F logic family specifications: propagation delays measured under CL = 50 pF / RL = 500 Ω conditions, input loading defined as 1.0 FAST unit load (20 µA HIGH / 0.6 mA LOW), and output loading rated at 50/33 unit loads for HIGH/LOW states respectively.

Key Specifications

Pinout & Package

Package: 14-pin plastic dual in-line package (DIP), SOT27-1 footprint, 300 mil width, through-hole mountable.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-input NAND gate applications.

Compared with SN74F20N and 74ACT20PC, the N74F20N,602 delivers optimal speed-to-power ratio for legacy TTL systems, retains full pin-and-function compatibility with original 74F20 designs, and avoids CMOS input sensitivity issues in electrically noisy industrial settings.

Availability

N74F20N,602 is available at Aetrix Electronics and suitable for microprocessor address decoding, legacy bus arbitration logic, and industrial PLC input conditioning requiring stable component supply and long-lifecycle support.

Supply support for N74F20N,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 broad logic, analog, and RF product portfolios.

The 74F logic family, including the N74F20N,602, was engineered for high-speed TTL-compatible digital systems requiring reliable performance in commercial and industrial environments.

FAQ

What is the maximum supply voltage rating for N74F20N,602?

The N74F20N,602 has an absolute maximum VCC rating of +7.0 V. Operation above 5.5 V - the upper limit of the recommended operating range - risks permanent damage. The device is designed for nominal 5 V ±10% supply; sustained use at 6.5 V or higher violates absolute maximum ratings and may degrade reliability or cause immediate failure. Always observe derating guidelines in thermal design when operating near limits.

Does N74F20N,602 support mixed-voltage interfacing with 3.3 V logic?

The N74F20N,602 does not guarantee reliable interfacing with 3.3 V logic families. Its VIH minimum is 2.0 V, which may accept 3.3 V HIGH signals, but its VIL maximum is 0.8 V - insufficient noise margin for clean recognition of 3.3 V LOW levels. Driving 3.3 V inputs with N74F20N,602 outputs risks overvoltage stress due to 5 V swing. Level-shifting circuitry is required for robust 3.3 V/5 V interoperation.

Are pins 8 and 11 on N74F20N,602 internally connected?

No, pins 8 and 11 on the N74F20N,602 are designated NC (no connect) and have no internal bonding or electrical function. They must remain unconnected in PCB layout. Routing traces or placing vias on these pads introduces unnecessary parasitic capacitance and potential contamination risk during assembly. The N74F20N,602 datasheet explicitly confirms both pins are unused and isolated from die circuitry.

What is the fan-out capability of N74F20N,602 outputs?

The N74F20N,602 outputs provide 50 unit loads in the HIGH state and 33 unit loads in the LOW state, where one FAST unit load equals 20 µA HIGH / 0.6 mA LOW. This translates to driving up to 50 standard 74LS inputs when HIGH or 33 when LOW. Real-world fan-out is limited by total capacitive load (CL ≤ 50 pF) and cumulative propagation delay; exceeding specified loads degrades timing margins and increases power dissipation.

Can N74F20N,602 operate outside the 0°C to +70°C range?

The N74F20N,602 is characterized and guaranteed only for 0°C to +70°C (commercial temperature range). While some units may function outside this range, parameters like propagation delay, output drive, and input thresholds are not tested or warranted beyond those limits. Extended operation below 0°C risks increased tPD and reduced IOL; above +70°C accelerates parametric drift and decreases reliability. For extended temperature needs, consider automotive-qualified alternatives like 74F20 variants rated to –40°C to +85°C.