NXP Semiconductors N74F157AD,623

Overview

N74F157AD,623 from Philips Semiconductors is a quad 2-input non-inverting data selector/multiplexer in 16-pin SO package (SOT109-1), operating at 4.5–5.5 V, with 4.6 ns typical propagation delay, 15 mA typical supply current, and industrial-grade temperature range support (–40°C to +85°C). It routes four parallel data bits from one of two input buses to a common output bus under shared Select (S) and active-low Enable (E) control-commonly used in register-to-bus data routing in TTL-compatible digital systems.

For engineers reviewing the N74F157AD,623 datasheet, N74F157AD,623 pinout, N74F157AD,623 application, or N74F157AD,623 equivalent, key selection criteria include its non-inverting logic behavior, guaranteed 20 mA low-level output drive, 50/33 FAST unit load fan-out capability, and compatibility with 74F-series timing and voltage thresholds in legacy digital control and data-path designs.

Technical Context

The N74F157AD,623 implements four independent 2:1 multiplexers sharing a single Select (S) line and an active-low Enable (E) input. Each Yn output follows I0n when S = L and I1n when S = H, provided E = L; all outputs go low when E = H-enabling synchronous bus gating across four channels.

It operates strictly within TTL-compatible voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), delivers VOH ≥ 2.5 V at –1 mA, VOL ≤ 0.5 V at 20 mA, and meets AC timing limits up to +85°C with CL = 50 pF and RL = 500 Ω-making it suitable for high-speed, noise-resilient data path switching in industrial control logic.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F157N and 74ACT157SCX, the N74F157AD,623 uniquely combines SO packaging, industrial temperature qualification, and strict 74F-series timing-making it optimal for volume-manufactured industrial controllers where thermal robustness and surface-mount reliability are mandatory.

Availability

N74F157AD,623 is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and embedded instrumentation requiring stable component supply with long-term lifecycle assurance.

Supply support for N74F157AD,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) is a global semiconductor innovator with leadership in logic, analog, and automotive ICs since the 1950s.

The 74F logic family-including N74F157AD,623-was engineered for high-speed TTL-compatible digital systems demanding sub-10 ns propagation and industrial-grade reliability in real-world factory and infrastructure environments.

FAQ

What is the logic behavior of N74F157AD,623 when Enable (E) is high?

When Enable (E) is high, all four outputs (Ya–Yd) of the N74F157AD,623 are forced low regardless of Select (S) or input states. This active-low enable allows global suppression of output activity-critical for bus isolation and power sequencing. The N74F157AD,623 does not enter high-impedance; outputs are actively driven low, ensuring defined logic levels during disable.

Does N74F157AD,623 support operation at 4.5 V supply?

Yes, N74F157AD,623 is fully specified for 4.5–5.5 V operation per its Recommended Operating Conditions. At VCC = 4.5 V, it maintains VOH ≥ 2.5 V (at –1 mA), VOL ≤ 0.5 V (at 20 mA), and tPD ≤ 7.5 ns (I0n/I1n → Yn), making it robust for brown-out conditions in industrial 5 V rails.

What is the maximum fan-out capability of N74F157AD,623 outputs?

N74F157AD,623 outputs provide 50 FAST unit loads in the high state and 33 in the low state. One FAST unit load equals 20 µA high / 0.6 mA low, so Ya–Yd can drive up to 33 standard TTL inputs (each drawing 0.6 mA low) while maintaining VOL ≤ 0.5 V-enabling direct connection to multiple downstream logic stages.

Is N74F157AD,623 pin-compatible with N74F158AD?

No, N74F157AD,623 and N74F158AD share identical pinout and package but differ in output polarity: N74F157AD,623 is non-inverting, while N74F158AD is inverting. Swapping them without logic inversion elsewhere will cause functional failure. Both use the same SOT109-1 SO-16 footprint but are not functionally interchangeable.

What is the industrial temperature range for N74F157AD,623?

N74F157AD,623 is qualified for –40°C to +85°C operation-the full industrial temperature range. This is explicitly stated in the Philips specification for the 74F157A variant (not 74F158A), and N74F157AD,623 carries this rating as the SO-packaged version of 74F157A.