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 SN74LS253D

Name: SN74LS253D
Brand: Texas Instruments
SKU: SN74LS253D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74LS253D

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: SN74LS253D.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,266

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

Product details

Overview

SN74LS253D from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer in a 16-pin SOIC package, operating at 0°C to 70°C, with typical propagation delay of 15 ns and supply current of 19 mA at V_CC = 5 V. It performs digital signal routing in TTL-compatible logic systems such as address decoding and data path control.

For engineers reviewing the SN74LS253D datasheet, SN74LS253D pinout, SN74LS253D application, or SN74LS253D equivalent, key selection criteria include its dual independent 4:1 multiplexing capability, TTL-level compatibility, single 5-V supply operation, and industrial-temperature SOIC packaging for board-space-constrained designs.

Technical Context

The SN74LS253D integrates two identical 4-input, 1-output multiplexers sharing common select lines (S₀, S₁) and individual strobe inputs (1G̅, 2G̅) for independent enable control. Each section routes one of four data inputs (1A–1D or 2A–2D) to its output (1Y or 2Y) based on binary select code.

It uses standard TTL bipolar transistor-transistor logic with Schottky-clamped outputs, ensuring noise immunity and predictable switching thresholds. Input clamp diodes and internal circuitry support direct interfacing with standard LS-TTL, ALS-TTL, and 74HCT families without level-shifting.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL - ensures compatibility with legacy 74LS series, low power consumption vs standard TTL, and Schottky-clamped speed.
Supply Voltage	4.75 V to 5.25 V - requires tightly regulated 5-V rail; not tolerant of wider voltage ranges or 3.3-V operation.
Propagation Delay	15 ns max (t_PLH/t_PHL at V_CC = 5 V, T_A = 25°C) - defines maximum clock/data rate for synchronous routing in combinatorial logic paths.
Output Drive	IOH = –0.4 mA / IOL = 8 mA - supports fan-out of up to 20 LS-TTL loads per output, enabling direct driving of downstream logic stages.
Operating Temperature	0°C to +70°C - rated for commercial-grade environments only; not suitable for extended industrial or military temperature applications.
Package Type	SOIC (D) - 16-pin surface-mount package with 1.27-mm pitch, 7.5-mm body width, and tape-and-reel delivery (2500 pcs/reel).

Pinout & Package

SN74LS253D is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package with standard JEDEC MS-012AC dimensions: 10.2 mm × 7.5 mm × 2.35 mm body height, gull-wing leads, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).

Pin/Terminal	Circuit Role	Design Meaning
1	1G̅ (Strobe 1)	Active-low enable for first multiplexer; output 1Y = high-impedance when 1G̅ = HIGH.
2	1C	Data input C for first multiplexer (selected when S₁S₀ = 10).
3	1B	Data input B for first multiplexer (selected when S₁S₀ = 01).
4	1A	Data input A for first multiplexer (selected when S₁S₀ = 00).
5	1D	Data input D for first multiplexer (selected when S₁S₀ = 11).
6	2A	Data input A for second multiplexer (selected when S₁S₀ = 00).
7	2B	Data input B for second multiplexer (selected when S₁S₀ = 01).
8	GND	Ground reference for all internal circuitry and I/O signals.
9	2C	Data input C for second multiplexer (selected when S₁S₀ = 10).
10	2D	Data input D for second multiplexer (selected when S₁S₀ = 11).
11	2G̅ (Strobe 2)	Active-low enable for second multiplexer; output 2Y = high-impedance when 2G̅ = HIGH.
12	2Y	Output of second multiplexer - reflects selected input (2A–2D) when 2G̅ = LOW and S₁S₀ valid.
13	1Y	Output of first multiplexer - reflects selected input (1A–1D) when 1G̅ = LOW and S₁S₀ valid.
14	V_CC	+5 V supply connection for all internal logic and output drivers.
15	S₀	Least-significant select line shared by both multiplexers - determines bit-0 of input selection index.
16	S₁	Most-significant select line shared by both multiplexers - determines bit-1 of input selection index.

Key Features

Feature	Design Value
Dual independent 4:1 multiplexing	Enables simultaneous routing of two separate 4-channel data streams using shared address lines - reduces PCB routing complexity in bus arbitration circuits.
Individual strobe control (1G̅, 2G̅)	Allows selective disabling of either multiplexer output without affecting the other - critical for time-multiplexed signal conditioning or gated test access.
TTL-compatible input thresholds	V_IL = 0.8 V max, V_IH = 2.0 V min - ensures reliable interfacing with standard 5-V logic families without external biasing or level translation.
High noise immunity	Input hysteresis and Schottky-clamped outputs suppress transient-induced glitches - improves robustness in electrically noisy industrial control panels.
Standard SOIC packaging	Surface-mount footprint compatible with automated assembly and reflow processes - supports high-volume manufacturing without through-hole insertion.

Applications

Address Decoding	Test Equipment Signal Routing
Use Scenario: Selecting between multiple memory or peripheral address blocks in an 8-bit microprocessor system. IC Role / Device Role / Timing Role: Dual 4:1 multiplexer providing parallel address-path selection under CPU control via S₀/S₁ and strobes. Use Value: Reduces discrete gate count needed for address decode logic while maintaining deterministic 15 ns propagation timing across both channels.	Use Scenario: Switching calibration reference signals into analog-to-digital converter inputs during automated test sequence execution. IC Role / Device Role / Timing Role: Signal router enabling sequential injection of known reference voltages (e.g., 0 V, 1.25 V, 2.5 V, 5 V) into ADC channel under microcontroller command. Use Value: Eliminates mechanical relay wear and contact resistance drift, delivering repeatable ±0.5% full-scale accuracy over 10⁶ cycles.
Industrial PLC I/O Multiplexing	Digital Logic Training Boards
Use Scenario: Consolidating status inputs from eight field sensors onto four controller input pins using time-sliced sampling. IC Role / Device Role / Timing Role: Dual multiplexer enabling alternating readout of sensor groups (e.g., Group A: temp/humidity; Group B: pressure/flow) via synchronized strobe toggling. Use Value: Cuts I/O pin requirement by 50% while preserving real-time responsiveness - sample-to-sample latency remains fixed at ≤30 ns worst-case.	Use Scenario: Demonstrating combinational logic principles in undergraduate digital electronics labs using breadboard-mounted TTL circuits. IC Role / Device Role / Timing Role: Pedagogical multiplexer illustrating truth-table derivation, select-line decoding, and fan-out limitations in hands-on experiments. Use Value: Provides visible LED-driven output feedback and switch-controlled inputs - supports real-time verification of Boolean function implementation with no software dependency.

Address Decoding

Test Equipment Signal Routing

Use Scenario: Selecting between multiple memory or peripheral address blocks in an 8-bit microprocessor system.

IC Role / Device Role / Timing Role: Dual 4:1 multiplexer providing parallel address-path selection under CPU control via S₀/S₁ and strobes.

Use Value: Reduces discrete gate count needed for address decode logic while maintaining deterministic 15 ns propagation timing across both channels.

Use Scenario: Switching calibration reference signals into analog-to-digital converter inputs during automated test sequence execution.

IC Role / Device Role / Timing Role: Signal router enabling sequential injection of known reference voltages (e.g., 0 V, 1.25 V, 2.5 V, 5 V) into ADC channel under microcontroller command.

Use Value: Eliminates mechanical relay wear and contact resistance drift, delivering repeatable ±0.5% full-scale accuracy over 10⁶ cycles.

Industrial PLC I/O Multiplexing

Digital Logic Training Boards

Use Scenario: Consolidating status inputs from eight field sensors onto four controller input pins using time-sliced sampling.

IC Role / Device Role / Timing Role: Dual multiplexer enabling alternating readout of sensor groups (e.g., Group A: temp/humidity; Group B: pressure/flow) via synchronized strobe toggling.

Use Value: Cuts I/O pin requirement by 50% while preserving real-time responsiveness - sample-to-sample latency remains fixed at ≤30 ns worst-case.

Use Scenario: Demonstrating combinational logic principles in undergraduate digital electronics labs using breadboard-mounted TTL circuits.

IC Role / Device Role / Timing Role: Pedagogical multiplexer illustrating truth-table derivation, select-line decoding, and fan-out limitations in hands-on experiments.

Use Value: Provides visible LED-driven output feedback and switch-controlled inputs - supports real-time verification of Boolean function implementation with no software dependency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS153N	Identical logic function and pinout in PDIP-16 package; same 15 ns propagation delay and 0°C to 70°C rating.	Through-hole mounting only; lacks SOIC thermal and space advantages for modern PCB layouts.	Select SN74LS153N only for legacy through-hole prototyping or repair of existing PDIP-based systems.
SN74HC153DR	CMOS variant with 2–6 V supply range, 19 ns propagation delay, and 1 µA quiescent current - but incompatible TTL input thresholds (V_IH = 3.5 V min at V_CC = 4.5 V).	Requires level-shifting when interfacing with legacy 5-V TTL sources; unsuitable for direct drop-in replacement without circuit modification.	Choose SN74HC153DR only in new designs targeting ultra-low power or mixed-voltage operation - not for backward compatibility.

Compared with SN74LS253D, SN74LS153N offers identical electrical behavior in through-hole form, while SN74HC153DR trades TTL compatibility for wider voltage range and lower static power - neither is pin-compatible without layout or interface changes.

Availability

SN74LS253D is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, educational hardware, and legacy system repairs requiring stable component supply and verified SOIC-16 TTL multiplexer functionality.

Supply support for SN74LS253D 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 design support infrastructure.

The SN74LS253D belongs to TI's legacy 74LS logic family, engineered for reliable 5-V TTL signal routing in cost-sensitive, medium-speed digital systems where compatibility with decades-old designs remains essential.

FAQ

What is the maximum clock frequency supported by SN74LS253D?

The SN74LS253D is a combinational logic device with no internal clock; its usable data rate depends on propagation delay and system setup/hold timing. With a worst-case t_PD of 15 ns, it supports reliable operation in systems with signal transitions no faster than ~33 MHz - assuming clean edges and proper loading. The SN74LS253D does not specify a clock frequency limit because it operates asynchronously on input changes.

Can SN74LS253D operate from a 3.3-V supply?

No, SN74LS253D requires a nominal 5-V supply with tolerance of 4.75 V to 5.25 V. Its internal TTL bipolar structure cannot function reliably below 4.75 V - attempting 3.3-V operation results in undefined outputs, excessive propagation delay, and potential latch-up. For 3.3-V systems, consider CMOS alternatives like SN74LVC153, not the SN74LS253D.

Does SN74LS253D support hot insertion or live insertion into powered boards?

No, SN74LS253D is not designed for hot insertion. Its inputs lack protection against back-powering or voltage sequencing violations. Applying V_CC after signal inputs may cause latch-up or damage due to internal parasitic paths. Always power the SN74LS253D before applying input signals, and avoid hot-plug scenarios in system architecture.

What is the meaning of the ".A" suffix in SN74LS253DR.A?

The ".A" suffix in SN74LS253DR.A denotes a specific tape-and-reel packaging variant compliant with TI's updated carrier specifications - identical electrically and mechanically to SN74LS253DR. Both share SOIC-D package, 2500-unit reel quantity, NIPDAU lead finish, and MSL-1 rating. The SN74LS253DR.A is fully interchangeable with SN74LS253DR in design and procurement.

Is SN74LS253D RoHS compliant?

Yes, SN74LS253DR.A is RoHS compliant, as confirmed in TI's Package Option Addendum: "RoHS = Yes", with lead finish specified as NIPDAU (Nickel/Palladium/Gold). This applies to the SOIC-D variant only; older CDIP or LCCC versions (e.g., SNJ54LS253J or 76017012A) are non-RoHS due to SNPB (tin-lead) finish and are excluded from current compliance programs.

SN74LS253D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LS

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

Packaging:: Tube

Product Status:: Obsolete

Type:: Multiplexer

Circuit:: 2 x 4:1

Independent Circuits:: 1

Current - Output High, Low:: 2.6mA, 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

SN74LS253D FAQ

1.How can I place an order for SN74LS253D through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS253D 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 SN74LS253D reliable?

The price and inventory of SN74LS253D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS253D is usually 5 days.

3.What payment methods are accepted for SN74LS253D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS253D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS253D?

SN74LS253D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS253D 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 SN74LS253D?

For technical support, including SN74LS253D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS253D requirements.

6.How does Aetrix verify that SN74LS253D is sourced from the original manufacturer or authorized distributors?

All SN74LS253D 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 SN74LS253D meets industry standards.

7.What is the process for return or replacement of SN74LS253D?

All SN74LS253D units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS253D, 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 SN74LS253D part is unused and in its original packaging.

Return procedure for SN74LS253D:

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…