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Texas Instruments SN74AS757DWR

Name: SN74AS757DWR
Brand: Texas Instruments
SKU: SN74AS757DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AS757DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74AS757DWR.pdf

Description:: IC BUF NON-INVERT 5.5V 20SOIC

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Product details

Overview

SN74AS757DWR from Texas Instruments is an octal noninverting buffer/line driver with open-collector outputs, designed for memory address bus driving and clock distribution in TTL-compatible systems. It features dual independent output-enable controls (1OE, 2OE), pnp input structure for reduced DC loading, and operates over 0°C to 70°C at VCC = 4.5–5.5 V. Its 20-pin SOIC (DW) package supports high-density PCB layouts in industrial control and legacy computing interfaces.

For engineers reviewing the SN74AS757DWR datasheet, SN74AS757DWR pinout, SN74AS757DWR application, or SN74AS757DWR equivalent, key selection criteria include open-collector drive capability (64 mA sink), propagation delay (1–6 ns), dual OE control architecture, and compatibility with AS-series timing-critical bus systems requiring overlap-free 3-state switching.

Technical Context

The SN74AS757DWR implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4; 2A1–2A4 → 2Y1–2Y4), each with dedicated active-low output-enable inputs (1OE, 2OE). Its pnp-input transistor structure lowers input current draw versus standard TTL, improving fan-in in address decoding trees.

All outputs are open-collector, enabling wired-AND logic, level translation, and direct interface to terminated bus lines without external pull-ups required for internal operation. Propagation delays are asymmetric-tPHL (1 ns min) is significantly faster than tPLH (3 ns min)-optimized for low-to-high transition timing constraints in synchronous address latching.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures stable operation across standard 5 V ±10% supply rails in industrial and computing environments.
IOL (Max)	64 mA - Supports direct drive of multiple TTL loads or 50 Ω terminated transmission lines without external buffers.
tPHL (A→Y)	1 ns (min) - Enables sub-nanosecond critical path timing in high-speed address multiplexing and clock gating.
tPLH (A→Y)	3 ns (min) - Matches system-level setup/hold windows when interfacing with AS-family latches and registers.
VIK (Input Clamp)	−1.2 V - Protects inputs against negative transients during hot-swap or ESD events in backplane-connected systems.
IIL (A Inputs)	−1 mA - Low input leakage enables cascading >10 stages without cumulative voltage droop on shared address buses.
Operating Temp	0°C to 70°C - Qualified for commercial-grade embedded controllers, test equipment, and legacy data acquisition modules.

Pinout & Package

SN74AS757DWR uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.5 mm body width, and 2.65 mm max height. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation standards.

Pin/Terminal	Circuit Role	Design Meaning
1	1OE	Active-low enable for first 4-bit buffer section (1Y1–1Y4); disables outputs to high-impedance state.
2–5	1A1–1A4	Noninverting inputs for first buffer section; accept TTL/AS-compatible logic levels.
6, 8, 10, 12	1Y1–1Y4	Open-collector outputs for first section; require external pull-up for logic HIGH assertion.
13–16	2A1–2A4	Noninverting inputs for second 4-bit buffer section.
17, 19, 3, 5	2Y1–2Y4	Open-collector outputs for second section; electrically isolated from first section's outputs.
18	2OE	Active-low enable for second buffer section; allows independent control of two bus segments.
7	GND	Ground reference for all internal circuitry and output drivers.
14	VCC	Positive supply rail (4.5–5.5 V); powers both buffer sections and input stage bias networks.

Key Features

Feature	Design Value
Dual independent OE controls	Enables time-multiplexed or partitioned bus driving-e.g., enabling 1Y outputs during address phase and 2Y during data phase without interlock logic.
pnp input structure	Reduces input current to −1 mA (IIL), cutting total address bus loading by >40% vs. standard 74AS240, extending fan-out in multi-slot backplanes.
Open-collector outputs	Permits wired-AND arbitration, level shifting to 3.3 V or 12 V buses via external pull-up, and fault-tolerant bus termination without risk of shoot-through.
No 3-state overlap requirement	Eliminates need for external delay circuits or OE sequencing logic-simplifies PCB layout and reduces BOM count in memory controller designs.
AS-series speed grade	Delivers 1 ns tPHL and 6 ns tPHL max-2× faster than 74ALS, enabling reliable operation up to 80 MHz bus clock rates in burst-mode addressing.

Applications

Memory Address Buffering	Legacy Bus Transceiver Interface
Use Scenario: Driving 16-bit address bus in 8086/8088-based industrial PLCs where multiple memory banks share a common bus. IC Role / Device Role / Timing Role: Noninverting octal buffer providing isolation and current gain between CPU address pins and SRAM/EPROM address inputs. Use Value: Dual OE inputs allow interleaved bank selection-1Y drives even-address memory while 2Y drives odd-address memory-reducing address decode latency by 3.5 ns per cycle.	Use Scenario: Interfacing ISA bus peripherals to modern microcontroller-based bridge logic in retro-computing test fixtures. IC Role / Device Role / Timing Role: Open-collector line driver translating 3.3 V MCU GPIO signals to 5 V ISA bus voltage levels with bidirectional handshake support. Use Value: 64 mA sink capability ensures robust LOW assertion across 8-inch ISA traces loaded with 10+ TTL inputs, eliminating need for discrete transistor arrays.
Clock Distribution Network	Industrial I/O Expansion Module
Use Scenario: Distributing synchronized clock signals to multiple ADC/DAC channels in a 12-bit data acquisition system operating at 10 MSPS. IC Role / Device Role / Timing Role: Low-skew buffer replicating master clock to eight parallel sampling circuits with matched trace routing. Use Value: 1 ns tPHL min and 6 ns tPHL max guarantee <100 ps skew between any two outputs-meeting setup/hold margins for AD7865-style converters.	Use Scenario: Expanding digital I/O capacity in DIN-rail mounted programmable logic relays using 24 V DC field wiring. IC Role / Device Role / Timing Role: Level-shifting buffer converting 5 V logic outputs to 24 V open-collector sink drivers for relay coil control. Use Value: −1.2 V input clamp voltage protects against inductive kickback from relay coils, preventing false triggering during rapid on/off cycling.

Memory Address Buffering

Legacy Bus Transceiver Interface

Use Scenario: Driving 16-bit address bus in 8086/8088-based industrial PLCs where multiple memory banks share a common bus.

IC Role / Device Role / Timing Role: Noninverting octal buffer providing isolation and current gain between CPU address pins and SRAM/EPROM address inputs.

Use Value: Dual OE inputs allow interleaved bank selection-1Y drives even-address memory while 2Y drives odd-address memory-reducing address decode latency by 3.5 ns per cycle.

Use Scenario: Interfacing ISA bus peripherals to modern microcontroller-based bridge logic in retro-computing test fixtures.

IC Role / Device Role / Timing Role: Open-collector line driver translating 3.3 V MCU GPIO signals to 5 V ISA bus voltage levels with bidirectional handshake support.

Use Value: 64 mA sink capability ensures robust LOW assertion across 8-inch ISA traces loaded with 10+ TTL inputs, eliminating need for discrete transistor arrays.

Clock Distribution Network

Industrial I/O Expansion Module

Use Scenario: Distributing synchronized clock signals to multiple ADC/DAC channels in a 12-bit data acquisition system operating at 10 MSPS.

IC Role / Device Role / Timing Role: Low-skew buffer replicating master clock to eight parallel sampling circuits with matched trace routing.

Use Value: 1 ns tPHL min and 6 ns tPHL max guarantee <100 ps skew between any two outputs-meeting setup/hold margins for AD7865-style converters.

Use Scenario: Expanding digital I/O capacity in DIN-rail mounted programmable logic relays using 24 V DC field wiring.

IC Role / Device Role / Timing Role: Level-shifting buffer converting 5 V logic outputs to 24 V open-collector sink drivers for relay coil control.

Use Value: −1.2 V input clamp voltage protects against inductive kickback from relay coils, preventing false triggering during rapid on/off cycling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal open-collector buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AS240N	Octal inverting buffer with dual OE; identical speed (1 ns tPHL) but inverted logic polarity.	Requires logic inversion in upstream signal path; unsuitable where noninverting topology is fixed by existing schematics.	Select only if system-level logic equations accommodate inversion or if used in complementary pairs with SN74AS241.
SN74F240N	F-series variant: higher power (ICC = 95 mA vs. 61 mA), slower (tPHL = 4 ns min), no pnp input structure (IIL = −0.5 mA).	Higher static current increases thermal load in dense I/O modules; slower edge rates limit use above 30 MHz bus speeds.	Prefer for cost-sensitive, lower-speed applications where AS-series speed and input loading are not required.

Compared with SN74AS240N and SN74F240N, SN74AS757DWR uniquely combines noninverting logic, dual independent OE control, and pnp-input low loading-making it irreplaceable in address multiplexing architectures requiring phase-aligned, low-skew, and low-power bus driving.

Availability

SN74AS757DWR is available at Aetrix Electronics and suitable for memory address buffering, legacy bus interfacing, and clock distribution requiring stable component supply in industrial control, test instrumentation, and retro-computing design programs.

Supply support for SN74AS757DWR 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.

The SN74AS757DWR belongs to TI's Advanced Schottky (AS) logic family, engineered for high-speed, low-power bus interface applications in systems demanding precise timing, noise immunity, and backward compatibility with TTL infrastructure.

FAQ

What is the maximum sink current per output of the SN74AS757DWR?

The SN74AS757DWR guarantees a minimum output sink current (IOL) of 64 mA per open-collector output under recommended operating conditions (VCC = 4.5 V, VOL = 0.55 V). This rating allows direct interface to heavily loaded 5 V TTL buses or 50 Ω transmission lines without external current amplification. The SN74AS757DWR maintains this performance across its full 0°C to 70°C operating range.

Does the SN74AS757DWR support 3.3 V logic inputs?

No-the SN74AS757DWR is an AS-series TTL-compatible device with VIH = 2.0 V (min) and VIL = 0.8 V (max), optimized for 5 V systems. While 3.3 V CMOS HIGH may exceed VIH in some cases, it falls below the 2.0 V guaranteed threshold and risks unreliable switching. For mixed-voltage designs, level-shifting circuitry or a 3.3 V–compatible buffer like SN74LVC244A is required before the SN74AS757DWR input.

How does the dual OE architecture of the SN74AS757DWR improve system timing?

The SN74AS757DWR's separate 1OE and 2OE inputs allow independent control of two 4-bit output groups, eliminating the need for external OE sequencing logic. This reduces propagation delay through enable paths by up to 7.5 ns versus cascaded single-OE buffers, enabling tighter timing margins in burst-mode memory access and time-division multiplexed I/O expansion. The SN74AS757DWR achieves this without increasing pin count or PCB area.

Can the SN74AS757DWR replace the SN74AS756 in existing designs?

Yes-with schematic modification. Both devices share identical pinout, package, and electrical specs, but the SN74AS757DWR has noninverting outputs while the SN74AS756 is inverting. Replacing SN74AS756 with SN74AS757DWR requires inverting the input signals or adjusting downstream logic. The SN74AS757DWR retains all timing, drive, and thermal characteristics of the SN74AS756, ensuring drop-in compatibility where logic polarity permits.

What is the moisture sensitivity level (MSL) rating for the SN74AS757DWR?

The SN74AS757DWR carries an MSL Level-1 rating per JEDEC J-STD-020, with unlimited floor life at ≤30°C/60% RH. Its SOIC (DW) package uses NiPdAu lead finish and is qualified for peak reflow temperatures up to 260°C, supporting standard lead-free soldering processes without baking requirements. This MSL rating applies specifically to the SN74AS757DWR reel packaging configuration (2000 pcs per large tape-and-reel).

SN74AS757DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AS

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: Open Collector

Current - Output High, Low:: -, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74AS757DWR FAQ

1.How can I place an order for SN74AS757DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AS757DWR 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 SN74AS757DWR reliable?

The price and inventory of SN74AS757DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS757DWR is usually 5 days.

3.What payment methods are accepted for SN74AS757DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS757DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AS757DWR?

SN74AS757DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AS757DWR 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 SN74AS757DWR?

For technical support, including SN74AS757DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS757DWR requirements.

6.How does Aetrix verify that SN74AS757DWR is sourced from the original manufacturer or authorized distributors?

All SN74AS757DWR 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 SN74AS757DWR meets industry standards.

7.What is the process for return or replacement of SN74AS757DWR?

All SN74AS757DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS757DWR, 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 SN74AS757DWR part is unused and in its original packaging.

Return procedure for SN74AS757DWR:

1.Submit a request within 90 days.

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

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