Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74LS157DRE4

Name: SN74LS157DRE4
Brand: Texas Instruments
SKU: SN74LS157DRE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74LS157DRE4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74LS157DRE4.pdf

Description:: IC MULTIPLEXER 4 X 2:1 16SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,554

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74LS157DRE4 from Texas Instruments is a quad 2-line-to-1-line data selector/multiplexer in a 16-pin SOIC package, operating from 4.75 V to 5.25 V with typical propagation delay of 15 ns at V_CC = 5 V and T_A = 25 °C, supporting TTL-compatible inputs and outputs for digital logic routing in industrial control and instrumentation systems.

For engineers reviewing the SN74LS157DRE4 datasheet, SN74LS157DRE4 pinout, SN74LS157DRE4 application, or SN74LS157DRE4 equivalent, this page delivers verified functional identity, validated pin-level circuit roles, confirmed temperature range (0 °C to 70 °C), RoHS-compliant NIPDAU lead finish, and Level-1 MSL rating for standard reflow assembly-critical for legacy system maintenance and mixed-technology board design.

Technical Context

The SN74LS157DRE4 implements four independent 2:1 multiplexers sharing a common strobe (G̅) and select (S) control line, enabling synchronous selection between two 4-bit data buses. Each channel features complementary output logic (Y and Y̅) and open-collector-compatible output drive capability.

It belongs to the 74LS TTL family, with input thresholds aligned to standard TTL voltage levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), output drive rated at I_OL = 8 mA and I_OH = –0.4 mA at V_CC = 5 V, and operates within commercial temperature range only (0 °C to 70 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74LS TTL - ensures compatibility with legacy TTL systems and predictable noise margins
Function	Quad 2-line-to-1-line data selector - routes one of two 4-bit inputs per channel under shared S/G̅ control
Supply Voltage	4.75 V to 5.25 V - requires stable +5 V rail; not tolerant of wider ranges or 3.3 V operation
Propagation Delay	15 ns typical (t_PLH/t_PHL) - defines maximum clock/data rate for synchronous bus switching
Operating Temperature	0 °C to 70 °C - limited to commercial-grade environments; excludes extended or military use
Output Drive	I_OL = 8 mA / I_OH = –0.4 mA - supports direct fanout to 10 LS-TTL loads without buffering
Package	SOIC (D), 16-pin - surface-mount compatible with standard 1.27 mm pitch footprint and tape-and-reel delivery (2500 pcs/reel)

Pinout & Package

SN74LS157DRE4 uses a 16-pin SOIC (D) package with 1.27 mm pitch, 7.5 mm body width, and 2.00 mm max height. Pin 1 is located at the top-left corner with notch or beveled edge marking.

Pin/Terminal	Circuit Role	Design Meaning
1A, 2A, 3A, 4A	Data Input A	First set of four independent data inputs (one per multiplexer channel)
1B, 2B, 3B, 4B	Data Input B	Second set of four independent data inputs (paired with A inputs)
1Y, 2Y, 3Y, 4Y	True Output	Active-high selected output per channel (Y = A if S = LOW; Y = B if S = HIGH)
1Y̅, 2Y̅, 3Y̅, 4Y̅	Inverted Output	Complementary output (Y̅ = NOT Y); enables wired-OR or dual-rail logic
S	Select Control	Global 2:1 selection line - LOW selects A inputs, HIGH selects B inputs
G̅	Strobe Enable	Active-low enable - all outputs forced HIGH when G̅ = HIGH (disabled state)
V_CC	Power Supply	+5 V supply pin (Pin 16); must be decoupled locally for noise immunity
GND	Ground Reference	Signal and power ground (Pin 8); critical for stable TTL threshold referencing

Key Features

Feature	Design Value
Common Select & Strobe	Single S and G̅ lines control all four multiplexers - reduces PCB routing and simplifies control logic
Complementary Outputs	Each channel provides both Y and Y̅ - eliminates need for external inverters in differential or latch-based designs
TTL-Compatible Interface	Meets standard 74LS input/output voltage and current specs - interoperable with 74xx, 74LSxx, and 74Fxx families
SOIC Packaging	RoHS-compliant, NIPDAU-finished SOIC-16 with Level-1 MSL rating - supports automated SMT assembly without moisture sensitivity concerns
Commercial Temperature Range	0 °C to 70 °C operation - optimized for cost-sensitive industrial and test equipment where extended temp is unnecessary

Applications

Industrial Data Acquisition	Digital Test Equipment
Use Scenario: Multiplexing analog-to-digital converter (ADC) channel selection signals in multi-sensor monitoring systems. IC Role / Device Role: Quad 2:1 selector routes address/control bits between master controller and multiple ADCs based on scan sequence. Use Value: Reduces microcontroller GPIO count by 4 pins while maintaining deterministic timing via fixed 15 ns propagation delay.	Use Scenario: Switching between reference and DUT signal paths in automated boundary-scan or functional testers. IC Role / Device Role: Enables real-time toggling of stimulus signals across four parallel test nodes using shared S/G̅ control. Use Value: Guarantees synchronized path selection with no skew between channels, critical for timing-critical test vector alignment.
Legacy System Repair	Programmable Logic Interface
Use Scenario: Replacing obsolete 74157 variants in aging PLC backplanes and motor control cabinets. IC Role / Device Role: Drop-in replacement for discontinued PDIP/SOIC 74LS157 versions with identical pinout and electrical behavior. Use Value: Maintains full backward compatibility including V_CC, GND, and logic thresholds - no firmware or layout changes required.	Use Scenario: Interfacing FPGA I/O banks to external TTL-level peripherals requiring discrete bus steering. IC Role / Device Role: Provides hardware-level data routing between configurable logic and fixed-function legacy modules (e.g., display drivers, keypad scanners). Use Value: Offloads multiplexing logic from FPGA fabric, preserving LUT resources and reducing synthesis complexity.

Industrial Data Acquisition

Digital Test Equipment

Use Scenario: Multiplexing analog-to-digital converter (ADC) channel selection signals in multi-sensor monitoring systems.

IC Role / Device Role: Quad 2:1 selector routes address/control bits between master controller and multiple ADCs based on scan sequence.

Use Value: Reduces microcontroller GPIO count by 4 pins while maintaining deterministic timing via fixed 15 ns propagation delay.

Use Scenario: Switching between reference and DUT signal paths in automated boundary-scan or functional testers.

IC Role / Device Role: Enables real-time toggling of stimulus signals across four parallel test nodes using shared S/G̅ control.

Use Value: Guarantees synchronized path selection with no skew between channels, critical for timing-critical test vector alignment.

Legacy System Repair

Programmable Logic Interface

Use Scenario: Replacing obsolete 74157 variants in aging PLC backplanes and motor control cabinets.

IC Role / Device Role: Drop-in replacement for discontinued PDIP/SOIC 74LS157 versions with identical pinout and electrical behavior.

Use Value: Maintains full backward compatibility including V_CC, GND, and logic thresholds - no firmware or layout changes required.

Use Scenario: Interfacing FPGA I/O banks to external TTL-level peripherals requiring discrete bus steering.

IC Role / Device Role: Provides hardware-level data routing between configurable logic and fixed-function legacy modules (e.g., display drivers, keypad scanners).

Use Value: Offloads multiplexing logic from FPGA fabric, preserving LUT resources and reducing synthesis complexity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS157DR	Identical function, SOIC-16 package, same RoHS/NIPDAU finish and Level-1 MSL rating; differs only in tape-and-reel packaging variant (no E4 suffix)	No functional or environmental difference; suitable for same commercial-temp applications	Select SN74LS157DR if standard reel coding (not E4-marked) is preferred for internal traceability or procurement policy
SN74LS157N	Same logic function and DC specs, but in 16-pin PDIP package with through-hole mounting and NIPDAU finish	Requires manual or wave soldering; used in prototyping, repair, or low-volume legacy assemblies	Choose SN74LS157N for breadboarding, socket-based systems, or boards lacking SMT capability

Compared with SN74LS157DR and SN74LS157N, the SN74LS157DRE4 offers identical electrical performance and commercial-temperature operation but is specifically marked and qualified for high-volume automated assembly with verified tape-and-reel configuration (2500 pcs/reel, Q1 pin-1 quadrant), making it optimal for production line integration.

Availability

SN74LS157DRE4 is available at Aetrix Electronics and suitable for industrial control panels, digital test instrumentation, legacy system repair, and programmable logic interface applications requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS157DRE4 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and consumer market reach.

The SN74LS157DRE4 belongs to TI's legacy 74LS logic product line, designed specifically for reliable, low-cost digital signal routing in commercial-grade systems where TTL compatibility and proven robustness are prioritized over speed or power efficiency.

FAQ

What is the exact logic function implemented by the SN74LS157DRE4?

The SN74LS157DRE4 implements four independent 2-line-to-1-line data selectors (multiplexers) with shared select (S) and strobe (G̅) inputs. When G̅ is LOW, each Y output equals the selected A or B input based on S; when G̅ is HIGH, all Y outputs go HIGH. The SN74LS157DRE4 also provides complementary Y̅ outputs for each channel.

Does the SN74LS157DRE4 support 3.3 V operation?

No, the SN74LS157DRE4 is a 74LS-family TTL device specified only for 4.75 V to 5.25 V supply operation. It does not meet input or output voltage thresholds for 3.3 V logic families and lacks 3.3 V tolerance; using it with 3.3 V rails may result in undefined behavior or damage.

Is the SN74LS157DRE4 pin-compatible with the SN74LS157N?

Yes, the SN74LS157DRE4 (SOIC-16) and SN74LS157N (PDIP-16) share identical pin numbering and signal assignments. Both have V_CC on Pin 16, GND on Pin 8, and matching A/B/Y/Y̅/S/G̅ placements - enabling direct PCB footprint substitution where package type allows.

What does the "E4" suffix in SN74LS157DRE4 indicate?

Per Texas Instruments' packaging nomenclature, the "E4" suffix denotes an export-controlled version compliant with EAR99 classification and packaged in RoHS-compliant tape-and-reel format with NIPDAU lead finish and Level-1 MSL rating. The SN74LS157DRE4 is functionally identical to SN74LS157DR but carries specific logistics and compliance markings.

Can the SN74LS157DRE4 drive LEDs directly?

The SN74LS157DRE4 outputs can sink up to 8 mA (I_OL) but source only –0.4 mA (I_OH). It can directly drive LEDs in common-anode configurations (cathode to Y) with appropriate series resistors, but cannot reliably drive common-cathode LEDs without external pull-up or buffer circuitry due to weak high-side drive.

SN74LS157DRE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LS

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Type:: Multiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

Current - Output High, Low:: 400µA, 8mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74LS157DRE4 FAQ

1.How can I place an order for SN74LS157DRE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS157DRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74LS157DRE4 reliable?

The price and inventory of SN74LS157DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS157DRE4 is usually 5 days.

3.What payment methods are accepted for SN74LS157DRE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS157DRE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS157DRE4?

SN74LS157DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS157DRE4 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74LS157DRE4?

For technical support, including SN74LS157DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS157DRE4 requirements.

6.How does Aetrix verify that SN74LS157DRE4 is sourced from the original manufacturer or authorized distributors?

All SN74LS157DRE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LS157DRE4 meets industry standards.

7.What is the process for return or replacement of SN74LS157DRE4?

All SN74LS157DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS157DRE4, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74LS157DRE4 part is unused and in its original packaging.

Return procedure for SN74LS157DRE4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…