Renesas 74HC157P-E

Overview

74HC157P-E from Renesas Electronics is a quad 2-to-1-line data selector/multiplexer with noninverted outputs, designed for digital signal routing in combinational logic systems. It operates across 2–6 V supply, delivers 12 ns typical propagation delay (CL = 50 pF), supports 10 LSTTL loads, and features active-low strobe control enabling synchronous output enable/disable. It is used in address/data bus selection, ALU input multiplexing, and digital test equipment.

For engineers reviewing the 74HC157P-E datasheet, 74HC157P-E pinout, 74HC157P-E application, or 74HC157P-E equivalent, key selection criteria include its DIP-16 package, common select/strobe architecture, guaranteed 4 µA max quiescent current at 25°C, –40 to +85°C operating range, and compatibility with HC-series logic families.

Technical Context

The 74HC157P-E integrates four independent 2-input multiplexers sharing one select line and one active-low strobe input. Each channel routes either A or B input to Y output based on the select state when strobe is low; all outputs go low when strobe is high.

It uses silicon-gate CMOS technology for low power consumption and high noise immunity. Internal decoding eliminates need for external logic to generate individual select signals, and output drive capability supports direct interfacing with LSTTL loads without buffers.

Key Specifications

Pinout & Package

DIP-16 plastic dual in-line package (PRDP0016AE-B / DP-16FV), 2.54 mm pitch, 19.2 mm × 6.3 mm body, through-hole mountable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC157P-E, SN74HC157N offers equivalent functionality with marginally relaxed timing, while MC74HC157N provides identical performance with alternate manufacturing traceability-both require no PCB changes but differ in long-term availability planning and qualification documentation scope.

Availability

74HC157P-E is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy system upgrades requiring stable component supply and long-lifecycle support.

Supply support for 74HC157P-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 Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The 74HC157P-E belongs to Renesas' legacy HC logic family, designed for reliable, low-power digital interfacing in cost-sensitive industrial and consumer applications where pin compatibility and broad voltage operation are essential.

FAQ

What is the maximum operating frequency supported by the 74HC157P-E?

The 74HC157P-E does not specify a maximum clock frequency in its datasheet because it is a combinational logic device without internal clocking. Its usable switching rate depends on propagation delay: at VCC = 4.5 V and CL = 50 pF, tPLH/tPHL is 12 ns typical, supporting clean data routing up to approximately 30 MHz in well-designed PCB layouts with proper termination and decoupling. The 74HC157P-E must be used with external timing control-no internal oscillator or clock circuitry is present.

Does the 74HC157P-E support 3.3 V logic levels?

Yes, the 74HC157P-E fully supports 3.3 V operation: its specified VCC range is 2.0–6.0 V, and input thresholds (VIH = 2.1 V min, VIL = 1.0 V max at VCC = 3.3 V) ensure compatibility with standard 3.3 V CMOS outputs. The 74HC157P-E also drives 3.3 V–compatible loads with VOH ≥ 3.15 V and VOL ≤ 0.1 V under 4 mA load, making it suitable for mixed-voltage system interfacing without level shifters.

What is the function of the Strobe pin on the 74HC157P-E?

The Strobe pin (Pin 15) is an active-low output enable control: when Strobe = L, the four Y outputs reflect the selected A or B inputs per the Select pin state; when Strobe = H, all four Y outputs are forced to logic low regardless of Select or input states. This allows the 74HC157P-E to be used in bus-shared architectures where multiple devices drive the same net-only the strobed device contributes valid data, preventing contention. The 74HC157P-E requires no external pull-up or pull-down on Strobe for normal operation.

Is the 74HC157P-E RoHS compliant?

Yes, the 74HC157P-E is RoHS compliant. Renesas Electronics confirms compliance with Directive 2011/65/EU (RoHS 2) for this part, as documented in their official environmental reports. The device uses lead-free terminations (Ni/Pd/Au plating) and halogen-free molding compound, meeting maximum concentration limits for Pb, Cd, Hg, Cr⁶⁺, PBB, and PBDE. Full compliance documentation for the 74HC157P-E is available via Renesas' website or authorized distributor portals upon request.

Can the 74HC157P-E replace the 74LS157 in existing designs?

Yes, the 74HC157P-E can directly replace the 74LS157 in most cases: it shares identical pinout, logic function, and DIP-16 packaging. Key advantages include lower power consumption (4 µA vs. ~15 mA quiescent), wider supply range (2–6 V vs. 4.75–5.25 V), and higher noise immunity. However, designers must verify that input rise/fall times meet HC-series requirements (≤400 ns at VCC = 6 V) and that output loading remains within ±5.2 mA limits-the 74HC157P-E cannot sink/source as much current as LS in short bursts. The 74HC157P-E is not a drop-in replacement if the original design relies on LS-specific timing margins or fanout behavior.