NXP Semiconductors N74F257AD,602

Overview

N74F257AD,602 from NXP Semiconductors (formerly Philips) is a quad 2-line to 1-line non-inverting multiplexer with 3-state outputs in a 16-pin SOIC package. It selects four parallel data bits from two input sources (I0a–I0d and I1a–I1d) using a common select (S) line, enables output isolation via active-low OE, and operates at 5V with 4.3ns typical propagation delay for data-to-output paths. It is used in bus multiplexing and data routing within industrial control logic systems.

For engineers reviewing the N74F257AD,602 datasheet, N74F257AD,602 pinout, N74F257AD,602 application, or N74F257AD,602 equivalent, key selection criteria include its 3-state output drive capability (±24mA), industrial temperature range (–40°C to +85°C), non-inverting signal path, SOT109-1 SO16 footprint compatibility, and direct functional equivalence to 74F257A logic family members.

Technical Context

The N74F257AD,602 implements four independent 2:1 multiplexers sharing one Select (S) input and one Output Enable (OE) input. Each multiplexer routes either I0n or I1n to Yn based on S logic level, with true (non-inverted) output polarity and high-impedance state when OE is high.

Its 3-state outputs support wired-OR bus architectures and require strict timing coordination of OE signals to prevent contention. Propagation delays are asymmetric: tPLH/tPHL from inputs to outputs is 3.0–7.0ns, while S-to-Y and OE-to-Y transitions exhibit longer delays (up to 10.5ns and 8.5ns respectively), critical for synchronous bus arbitration design.

Key Specifications

Pinout & Package

Package: 16-pin plastic small outline (SO), body width 3.9 mm, JEDEC MS-012 compliant, SOT109-1 footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.

Compared with SN74F257N and 74ACT257SCX, the N74F257AD,602 delivers optimal balance of industrial temperature support, proven 74F-family timing behavior, and SOIC packaging for surface-mount production - making it the preferred choice for volume-manufactured industrial controllers requiring long-term component stability.

Availability

N74F257AD,602 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and digital logic prototyping requiring stable component supply, long-lifecycle availability, and verified SOIC-16 footprint compatibility.

Supply support for N74F257AD,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 formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions and high-performance mixed-signal ICs.

The 74F logic family - including the N74F257AD,602 - was designed for high-speed, low-power TTL-compatible digital systems in industrial and computing applications, emphasizing noise immunity, predictable timing, and robust 3-state bus control.

FAQ

What is the operating voltage range for the N74F257AD,602?

The N74F257AD,602 operates over a supply voltage range of 4.5 V to 5.5 V, fully compliant with standard 5 V TTL system rails and ±10% tolerance requirements. This range ensures stable functionality across variations in power distribution networks and supports interoperability with legacy 74F, 74LS, and 74AS logic families without level translation. The N74F257AD,602 maintains specified AC and DC performance across this entire range at temperatures from –40°C to +85°C.

Does the N74F257AD,602 support hot insertion or live bus swapping?

No, the N74F257AD,602 does not support hot insertion. Its absolute maximum ratings specify that output voltage must remain within –0.5 V to VCC during operation, and IOZL/IOZH leakage is only guaranteed under static conditions. Applying voltage to outputs while VCC is unpowered risks latch-up or permanent damage. For live bus applications, external protection circuitry or dedicated hot-swap controllers must be used alongside the N74F257AD,602.

What is the function of Pin 15 (OE) on the N74F257AD,602?

Pin 15 is the active-low Output Enable (OE) input. When OE is held HIGH, all four outputs (Ya–Yd) enter high-impedance (Z) state regardless of S or input states - effectively disconnecting the device from the bus. When OE is LOW, outputs respond to S and data inputs. This pin enables time-multiplexed bus sharing and prevents signal contention when multiple 3-state devices share a common data path. The N74F257AD,602 requires OE to be driven cleanly with TTL-compatible logic levels.

Can the N74F257AD,602 be used as a level shifter between 3.3 V and 5 V logic?

No, the N74F257AD,602 is not designed or characterized for 3.3 V to 5 V level shifting. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) accept 3.3 V logic HIGH, but its outputs swing rail-to-rail at 5 V and may exceed 3.3 V absolute maximum ratings of downstream 3.3 V receivers. Additionally, the N74F257AD,602 draws significant ICC when driving capacitive loads at 5 V, increasing power dissipation unnecessarily in mixed-voltage systems.

Is there a pin-compatible inverting version of the N74F257AD,602?

Yes, the 74F258A is the pin-compatible inverting counterpart to the N74F257AD,602. It shares identical pinout, package, timing, and DC specifications, but inverts the selected data before presenting it at Ya–Yd. The N74F257AD,602 and 74F258A differ only in internal logic - both use the same S and OE controls and support identical industrial temperature ranges and 3-state operation.