Renesas 74LS157FPEL-E

Overview

74LS157FPEL-E from Renesas Electronics is a quadruple 2-line-to-1-line data selector/multiplexer with noninverted outputs, designed for digital logic routing in TTL-compatible systems. It features four independent 2:1 multiplexers, a common strobe (G) and select (S) control, 16-pin SOP package, propagation delay ≤27 ns (select-to-output), and operates at VCC = 4.75–5.25 V over –20°C to +75°C - used in address/data bus selection and ALU operand routing.

For engineers reviewing the 74LS157FPEL-E datasheet, 74LS157FPEL-E pinout, 74LS157FPEL-E application, or 74LS157FPEL-E equivalent, key selection considerations include true-output logic polarity, strobe-enabled gating, guaranteed 8 mA sink capability per output, and JEITA-standard SOP-16 (FP-16DAV) mechanical compatibility with automated SMT assembly.

Technical Context

The 74LS157FPEL-E implements four independent 2:1 multiplexers sharing a single active-low strobe (G) and a common select (S) input. When G is high, all Y outputs are forced low regardless of S or data inputs; when G is low, each Yn follows the corresponding An (if S = low) or Bn (if S = high). No internal latching or clocking is present - operation is purely combinational.

All inputs accept standard LS-TTL voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and outputs drive LS-TTL loads directly (IOH = –400 µA, IOL = 8 mA). Propagation delays are asymmetric: data-to-output tPHL/tPLH ≤ 14 ns, while strobe-to-output and select-to-output delays reach up to 27 ns under CL = 15 pF loading.

Key Specifications

Pinout & Package

SOP-16 surface-mount package (JEITA code PRSP0016DH-B, Renesas abbreviation FP-16DAV), 1.27 mm lead pitch, 5.5 mm width, 10.06 mm length, 1.75 mm max height, Ni/Pd/Au-plated terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS157N and 74HCT157PW, the 74LS157FPEL-E uniquely delivers LS-TTL electrical compatibility in a JEITA-standard SOP-16 tape-and-reel format - essential for production SMT lines targeting legacy digital logic upgrades without board redesign.

Availability

74LS157FPEL-E is available at Aetrix Electronics and suitable for microprocessor bus switching, ALU operand routing, parallel data path selection, and digital test equipment signal configuration requiring stable component supply and long-term obsolescence management.

Supply support for 74LS157FPEL-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 Japanese semiconductor manufacturer formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and legacy logic solutions.

The HD74LS family was developed by Renesas (and predecessor NEC) to provide pin- and function-compatible replacements for industry-standard 74LS logic, supporting industrial control, instrumentation, and retro-computing maintenance with assured long-term supply.

FAQ

What logic family does the 74LS157FPEL-E belong to, and is it compatible with other 74LS devices?

The 74LS157FPEL-E belongs to the 74LS (low-power Schottky TTL) logic family. It is fully compatible with other 74LS-series components in terms of voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), output drive (IOL = 8 mA), and timing - enabling direct substitution in existing 74LS157-based designs without circuit modification. The 74LS157FPEL-E maintains identical functional behavior and pinout as the original HD74LS157 specification.

Does the 74LS157FPEL-E support hot insertion or live-state changes on its select and strobe inputs?

No, the 74LS157FPEL-E does not support hot insertion or guaranteed glitch-free operation during dynamic changes to S or G inputs. Transient output glitches may occur during select or strobe transitions due to internal gate propagation mismatches. For clean switching, ensure S and G signals are stable before and after data transitions, and use external synchronization if required. The 74LS157FPEL-E datasheet specifies no hot-swap qualification.

What is the maximum capacitive load the 74LS157FPEL-E can drive while maintaining specified propagation delay?

The 74LS157FPEL-E's switching characteristics (tPLH/tPHL) are characterized at CL = 15 pF with RL = 2 kΩ. Driving loads significantly above 15 pF will increase propagation delay nonlinearly and may cause marginal timing in high-speed systems. For loads >20 pF, buffer stages or reduced clock rates are recommended. The 74LS157FPEL-E output stage is optimized for standard LS-TTL fanout, not heavy capacitive loads.

Is the 74LS157FPEL-E rated for automotive or extended temperature applications?

No, the 74LS157FPEL-E is rated for commercial/industrial operation only (Topr = –20°C to +75°C) and carries the "Standard" quality grade per Renesas classification. It is not qualified for automotive (–40°C to +125°C), aerospace, medical life-support, or other "High Quality" or "Specific" applications. Use in automotive contexts requires formal qualification testing and is not supported by Renesas for the 74LS157FPEL-E.

How does the strobe (G) input interact with the select (S) input in the 74LS157FPEL-E?

In the 74LS157FPEL-E, the strobe (G) input has priority over the select (S) input: when G is high, all four Y outputs are forced low regardless of S or data inputs; only when G is low does the S input determine whether each Yn passes the corresponding An (S = low) or Bn (S = high). This hierarchical control enables global output disable for bus isolation - a feature explicitly defined in the 74LS157FPEL-E function table and block diagram.