Renesas 74AC157FP-E

Overview

74AC157FP-E from Renesas is a high-speed quad 2-input multiplexer in SOP-16 (JEITA FP-16DAV) package, operating from 2 V to 6 V supply, with ±24 mA output drive, 9.0 ns max propagation delay at 5 V, and active-low enable control. It selects four parallel data bits from two input sources (I0a–d and I1a–d) for true-level outputs (Za–d), commonly used in register-to-bus data routing and logic function generation.

For engineers reviewing the 74AC157FP-E datasheet, 74AC157FP-E pinout, 74AC157FP-E application, or 74AC157FP-E equivalent, key selection criteria include its common-select/common-enable architecture, noninverting output behavior, guaranteed operation across –40°C to +85°C, and compatibility with TTL/CMOS logic families at 3.3 V and 5 V rails.

Technical Context

The 74AC157FP-E implements four independent 2:1 multiplexers sharing one Select (S) and one active-low Enable (E) input. Its logic equations are Za = E•(I1a•S + I0a•S), with all outputs forced low when E is high - confirming strict active-low enable functionality and no internal inversion.

It supports mixed-voltage interfacing within its 2–6 V VCC range, exhibits 4.5 pF typical input capacitance and 50 pF power dissipation capacitance at 5 V, and meets AC characteristics including 7.0 ns typical tPLH/tPHL (S→Zn) at 5 V with 50 pF load - indicating suitability for medium-speed digital control and data path switching.

Key Specifications

Pinout & Package

SOP-16 package (JEITA code FP-16DAV), 10.06 mm × 4.40 mm body, 1.27 mm lead pitch, Ni/Pd/Au plating, 0.24 g mass.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input multiplexer applications.

Compared with SN74AC157DR and 74VHC157M, the 74AC157FP-E offers JEITA-standard SOP packaging with verified 9 ns timing at 5 V and industrial temp support - making it optimal for space-constrained Japanese OEM designs requiring FP-16DAV footprint compliance.

Availability

74AC157FP-E is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, and embedded data routing systems requiring stable component supply, long-lifecycle support, and JEITA-compliant packaging.

Supply support for 74AC157FP-E 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

Renesas Technology Corp. (now part of Renesas Electronics Corporation) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and logic devices for industrial, automotive, and infrastructure markets.

The HD74AC157 product line delivers high-speed, low-power TTL-compatible logic ICs optimized for data routing, bus management, and combinational logic synthesis in resource-constrained embedded systems.

FAQ

What is the logic state of outputs Za–d when Enable (E) is high on the 74AC157FP-E?

When the Enable input (E) is high, all outputs Za–d are forced low regardless of the Select (S) input or data inputs I0x/I1x. This active-low enable behavior is defined in the logic equations (Za = E•(I1a•S + I0a•S)) and confirmed in the truth table - ensuring predictable bus isolation during system reset or fault conditions. The 74AC157FP-E guarantees this low-state assertion across its full operating temperature and voltage range.

Does the 74AC157FP-E support 3.3 V operation, and what are the guaranteed input thresholds at that voltage?

Yes, the 74AC157FP-E supports 3.3 V operation within its specified 2–6 V VCC range. At VCC = 3.3 V, VIH is guaranteed ≥2.1 V and VIL ≤0.9 V (per DC Characteristics table), providing >0.6 V noise margin for clean interfacing with 3.3 V microcontrollers and FPGAs. These thresholds are measured under load and validated across –40°C to +85°C, ensuring robustness in mixed-voltage systems.

Is the 74AC157FP-E pin-compatible with the SN74AC157DR, and can it be used as a drop-in replacement?

The 74AC157FP-E and SN74AC157DR share identical pin functions and logic behavior, but differ in package standard: FP-16DAV (JEITA) vs. SOIC-16 (JEDEC). While pin numbering matches, physical dimensions and lead form vary - FP-16DAV has 0.20 mm lead thickness and 10.06 mm body length, while SOIC-16 is 10.3 mm. Thus, PCB layout changes are required; it is not a drop-in replacement despite functional equivalence.

What is the maximum capacitive load the 74AC157FP-E can drive while maintaining specified propagation delay?

The 74AC157FP-E AC characteristics are specified with CL = 50 pF, and propagation delay increases with load capacitance. At 5 V VCC, tPLH/tPHL remains within 9.0 ns max up to 50 pF. Driving >50 pF will degrade timing - e.g., 100 pF may increase delay by ~30%. For heavier loads, buffer stages or lower-capacitance routing should be used. The 74AC157FP-E's 50 pF CPD value reflects typical dynamic loading impact on supply current.

Can the 74AC157FP-E be used as a 4-bit function generator, and how is that implemented?

Yes, the 74AC157FP-E can generate any four of the sixteen possible 2-variable Boolean functions (e.g., AND, OR, XOR, NAND) by assigning logic variables to I0x/I1x and using S as the function selector. For example, setting I0a=0, I1a=A, I0b=B, I1b=1 yields Za=A•S, Zb=B+S - enabling compact function synthesis. This capability is explicitly documented in the Functional Description section and leveraged in gate-array-like logic reduction without programmable resources.