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

Texas Instruments SN74AS253ADRG4

Name: SN74AS253ADRG4
Brand: Texas Instruments
SKU: SN74AS253ADRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AS253ADRG4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: SN74AS253ADRG4.pdf

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

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Product details

Overview

SN74AS253ADRG4 from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, designed for bus-organized digital systems. It features two independent 4-input sections (C0–C3 per section), common select lines (A/B), separate output-enable (1OE/2OE) controls, and operates at 4.5–5.5 V over 0°C to 70°C. It enables parallel-to-serial conversion in TTL-compatible logic circuits.

For engineers reviewing the SN74AS253ADRG4 datasheet, SN74AS253ADRG4 pinout, SN74AS253ADRG4 application, or SN74AS253ADRG4 equivalent, key selection criteria include its 13.5 ns max propagation delay (A/B to Y), 48 mA low-level output drive, 15 mA high-level sink capability, and SOIC-16 package compatibility with legacy 74-series board layouts.

Technical Context

This device implements two independent 4:1 multiplexers using AND-OR-invert logic with full binary decoding of select inputs A and B-common to both sections. Each section has dedicated output-enable (1OE/2OE) pins that place the corresponding Y output in high-impedance state when asserted high.

It uses advanced Schottky (AS) bipolar technology, delivering faster switching than ALS variants: tPHL/tPLH ≤11.5/13.5 ns (A/B→Y), tPHL/tPLH ≤8/7.5 ns (data→Y), and enable/disable times as low as 1 ns (tPHZ) and 2.5 ns (tPZL). Output drive strength (IOL = 48 mA, IOH = −15 mA) supports direct interfacing with multiple TTL loads without buffers.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74AS (Advanced Schottky TTL) - ensures compatibility with 5 V TTL systems and higher noise immunity than standard TTL.
Supply Voltage	4.5 V to 5.5 V - supports stable operation across industrial-grade 5 V rail tolerances.
Propagation Delay	≤13.5 ns (A/B→Y), ≤7.5 ns (data→Y) - enables use in high-speed address/data routing up to ~70 MHz clock-equivalent systems.
Output Drive	IOL = 48 mA, IOH = −15 mA - drives ≥10 standard TTL loads directly; eliminates need for external bus drivers.
Operating Temperature	0°C to 70°C - qualified for commercial and industrial control applications with ambient thermal constraints.
Input Thresholds	VIH = 2.0 V min, VIL = 0.8 V max - ensures robust logic-level recognition across voltage variations and PCB trace losses.
3-State Leakage	IOZL = −50 µA, IOZH = 50 µA - guarantees minimal bus contention during output disable, critical for shared-data-bus integrity.

Pinout & Package

SN74AS253ADRG4 is housed in a 16-pin SOIC (D) package (5.3 mm width, 10.2 mm length, 1.75 mm height), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating for unlimited floor life.

Pin/Terminal	Circuit Role	Design Meaning
1 (1OE)	Section 1 Output Enable	Active-low control: pulls 1Y to high-Z when high; enables 1Y when low.
2 (1C0)	Section 1 Data Input 0	First data input for multiplexer section 1; selected when A=0, B=0.
3 (1C1)	Section 1 Data Input 1	Second data input for section 1; selected when A=1, B=0.
4 (1C2)	Section 1 Data Input 2	Third data input for section 1; selected when A=0, B=1.
5 (1C3)	Section 1 Data Input 3	Fourth data input for section 1; selected when A=1, B=1.
6 (1Y)	Section 1 Output	3-state output of section 1; reflects selected Cx input when 1OE is low.
7 (GND)	Ground Reference	Power return path for all internal logic and output stages.
8 (2C0)	Section 2 Data Input 0	First data input for multiplexer section 2; shares A/B selects with section 1.
9 (2Y)	Section 2 Output	3-state output of section 2; independently controlled by 2OE (pin 15).
10 (2C1)	Section 2 Data Input 1	Second data input for section 2; selected under same A/B codes as section 1.
11 (2C2)	Section 2 Data Input 2	Third data input for section 2; enables identical 4:1 routing on second channel.
12 (2C3)	Section 2 Data Input 3	Fourth data input for section 2; completes dual independent multiplexer functionality.
13 (VCC)	Supply Voltage	+5 V power rail connection; decoupling capacitor required near pin for noise suppression.
14 (B)	Common Select Bit 1	Shared select line for both sections; defines MSB of 2-bit address (A/B).
15 (2OE)	Section 2 Output Enable	Active-low control for 2Y; allows independent bus arbitration between two data paths.
16 (A)	Common Select Bit 0	Shared select line for both sections; defines LSB of 2-bit address (A/B).

Key Features

Feature	Design Value
Dual independent 4:1 multiplexers	Enables simultaneous routing of two separate 4-input data streams using shared A/B address lines - reduces control logic overhead in multi-channel systems.
Individual 3-state output enables (1OE/2OE)	Allows selective bus connection/disconnection per channel - essential for time-multiplexed data sharing on common system buses without contention.
AS-family speed performance	Delivers 2× faster propagation vs. 74ALS253 (e.g., 13.5 ns vs. 21 ns A→Y), enabling tighter timing margins in high-throughput digital controllers.
High-current TTL-compatible outputs	48 mA sink / 15 mA source capability drives heavy TTL fan-out directly - eliminates buffer stages and saves PCB area in legacy 5 V designs.
SOIC-16 footprint with industry-standard pinout	Direct drop-in replacement for SN74ALS253D/SN74LS253D in existing layouts - no redesign needed for speed upgrades or obsolescence mitigation.

Applications

Industrial PLC I/O Multiplexing	Legacy Bus Arbitration
Use Scenario: Consolidating discrete sensor inputs (e.g., 8 temperature switches) onto a single microcontroller data bus using time-sliced addressing. IC Role / Device Role / Timing Role: Dual 4:1 multiplexer routes two groups of four sensors to MCU via shared A/B select lines and timed OE strobes. Use Value: Reduces MCU GPIO count by 6 pins while maintaining deterministic 7.5 ns data-to-bus latency - critical for cycle-accurate scan logic.	Use Scenario: Managing bidirectional data flow between two peripheral controllers (e.g., UART + SPI master) sharing one 8-bit data bus. IC Role / Device Role / Timing Role: Acts as direction-aware bus switch: one section routes UART TX, the other routes SPI MOSI, with OE-controlled isolation. Use Value: Eliminates need for discrete bus transceivers; 1 ns enable-to-output (tPHZ) ensures glitch-free bus handoff during protocol transitions.
Test Equipment Signal Routing	Embedded System Address Decoding
Use Scenario: Configurable signal path selection in automated test fixtures where DUT interface signals must be dynamically assigned to measurement instruments. IC Role / Device Role / Timing Role: Provides reconfigurable analog/digital signal routing under microcontroller control via A/B/OE lines. Use Value: 48 mA drive supports driving long cables or multiple instrument inputs; 13.5 ns max delay preserves signal edge fidelity for timing-critical measurements.	Use Scenario: Generating chip-select signals for up to eight memory-mapped peripherals using 3-bit address decoding (A/B + additional select). IC Role / Device Role / Timing Role: Implements partial address decode: A/B select among four CS groups, each enabled by external gating logic. Use Value: Enables compact, low-latency decode logic with <14 ns propagation - avoids timing violations in fast 5 V microprocessor buses (e.g., 80C88).

Industrial PLC I/O Multiplexing

Legacy Bus Arbitration

Use Scenario: Consolidating discrete sensor inputs (e.g., 8 temperature switches) onto a single microcontroller data bus using time-sliced addressing.

IC Role / Device Role / Timing Role: Dual 4:1 multiplexer routes two groups of four sensors to MCU via shared A/B select lines and timed OE strobes.

Use Value: Reduces MCU GPIO count by 6 pins while maintaining deterministic 7.5 ns data-to-bus latency - critical for cycle-accurate scan logic.

Use Scenario: Managing bidirectional data flow between two peripheral controllers (e.g., UART + SPI master) sharing one 8-bit data bus.

IC Role / Device Role / Timing Role: Acts as direction-aware bus switch: one section routes UART TX, the other routes SPI MOSI, with OE-controlled isolation.

Use Value: Eliminates need for discrete bus transceivers; 1 ns enable-to-output (tPHZ) ensures glitch-free bus handoff during protocol transitions.

Test Equipment Signal Routing

Embedded System Address Decoding

Use Scenario: Configurable signal path selection in automated test fixtures where DUT interface signals must be dynamically assigned to measurement instruments.

IC Role / Device Role / Timing Role: Provides reconfigurable analog/digital signal routing under microcontroller control via A/B/OE lines.

Use Value: 48 mA drive supports driving long cables or multiple instrument inputs; 13.5 ns max delay preserves signal edge fidelity for timing-critical measurements.

Use Scenario: Generating chip-select signals for up to eight memory-mapped peripherals using 3-bit address decoding (A/B + additional select).

IC Role / Device Role / Timing Role: Implements partial address decode: A/B select among four CS groups, each enabled by external gating logic.

Use Value: Enables compact, low-latency decode logic with <14 ns propagation - avoids timing violations in fast 5 V microprocessor buses (e.g., 80C88).

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
SN74ALS253DR	ALS family: slower (21 ns A→Y), lower drive (24 mA IOL), higher ICC (12 mA active vs. 29 mA for SN74AS253A).	Suitable for cost-sensitive, lower-speed systems where timing margin >15 ns exists and bus loading ≤5 TTL units.	Select when power efficiency and legacy compatibility outweigh speed requirements.
SN74LS253N	LS family: slowest (34 ns A→Y), weakest drive (8 mA IOL), highest noise sensitivity (VIH = 2.0 V but VIL = 0.8 V less robust).	Applicable only in non-critical, low-frequency control logic with minimal bus loading and generous timing slack.	Choose only for strict LS-family ecosystem compliance or extreme cost constraints - not recommended for new designs.

Compared with SN74ALS253DR and SN74LS253N, SN74AS253ADRG4 delivers the highest speed and drive strength in the 74xx253 family, making it optimal for timing-critical bus interfaces and high-fan-out applications where ALS/LS variants risk setup/hold violations or insufficient current delivery.

Availability

SN74AS253ADRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O multiplexing, legacy bus arbitration, test equipment signal routing, and embedded system address decoding requiring stable component supply and long-term production continuity.

Supply support for SN74AS253ADRG4 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 global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

SN74AS253ADRG4 belongs to TI's 74AS logic family, engineered for high-speed, low-power 5 V TTL-compatible digital systems where propagation delay and output drive are critical - particularly in retrofitted industrial controls and test instrumentation.

FAQ

What logic family does SN74AS253ADRG4 belong to, and how does it differ from SN74LS253?

SN74AS253ADRG4 belongs to the 74AS (Advanced Schottky) logic family. Compared to SN74LS253 (Low-Power Schottky), it offers significantly faster propagation delays (≤13.5 ns vs. ≤34 ns), higher output drive (48 mA vs. 8 mA), and improved noise immunity due to tighter VIH/VIL thresholds. These differences make SN74AS253ADRG4 suitable for timing-critical applications where LS variants would violate setup/hold windows or fail to drive heavy bus loads.

Can SN74AS253ADRG4 replace SN74ALS253DR on an existing PCB?

Yes, SN74AS253ADRG4 is a pin-compatible drop-in replacement for SN74ALS253DR in SOIC-16 packages. Both share identical pinout, supply voltage range (4.5–5.5 V), and logic-level compatibility. However, SN74AS253ADRG4 draws higher supply current (29 mA vs. 12 mA) and delivers faster edges - verify that the PCB layout includes adequate local decoupling (e.g., 100 nF ceramic near VCC/GND) to manage increased transient current demands.

What is the function of pins 1 (1OE) and 15 (2OE) on SN74AS253ADRG4?

Pins 1 and 15 are independent active-low output-enable controls for section 1 (1Y) and section 2 (2Y), respectively. When pulled high, each output enters high-impedance (3-state) mode, electrically disconnecting that section from the bus. When pulled low, the corresponding Y output reflects the selected Cx input based on A/B states. This enables independent bus arbitration - e.g., one section can drive while the other is tri-stated to prevent contention.

Does SN74AS253ADRG4 support mixed-voltage interfacing, such as 3.3 V controllers?

No, SN74AS253ADRG4 is strictly a 5 V TTL device with VIH = 2.0 V min and VIL = 0.8 V max. While 3.3 V logic may meet these thresholds marginally, TI does not characterize or guarantee operation with 3.3 V inputs. For reliable interfacing with 3.3 V controllers, level-shifting circuitry (e.g., SN74AVC4T245) or a 3.3 V–compatible multiplexer (e.g., SN74LVC157A) is required. SN74AS253ADRG4 must be powered from a clean 5 V rail.

What packaging and compliance information applies to SN74AS253ADRG4?

SN74AS253ADRG4 is supplied in a RoHS-compliant SOIC-16 (D) package with NiPdAu lead finish, MSL Level-1 rating (unlimited floor life), and tape-and-reel packaging (40 pcs/tube). It meets JEDEC standards for solderability and thermal profile (peak reflow ≤260°C). The "G4" suffix denotes green (halogen-free) packaging per TI's environmental policy - confirmed in TI's official packaging addendum for this orderable part.

SN74AS253ADRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AS

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Multiplexer

Circuit:: 2 x 4:1

Independent Circuits:: 1

Current - Output High, Low:: 2.6mA, 24mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74AS253ADRG4 FAQ

1.How can I place an order for SN74AS253ADRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AS253ADRG4 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 SN74AS253ADRG4 reliable?

The price and inventory of SN74AS253ADRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS253ADRG4 is usually 5 days.

3.What payment methods are accepted for SN74AS253ADRG4?

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SN74AS253ADRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AS253ADRG4 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 SN74AS253ADRG4?

For technical support, including SN74AS253ADRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS253ADRG4 requirements.

6.How does Aetrix verify that SN74AS253ADRG4 is sourced from the original manufacturer or authorized distributors?

All SN74AS253ADRG4 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 SN74AS253ADRG4 meets industry standards.

7.What is the process for return or replacement of SN74AS253ADRG4?

All SN74AS253ADRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS253ADRG4, 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 SN74AS253ADRG4 part is unused and in its original packaging.

Return procedure for SN74AS253ADRG4:

1.Submit a request within 90 days.

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

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