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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74BCT757DW

Name: SN74BCT757DW
Brand: Texas Instruments
SKU: SN74BCT757DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74BCT757DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74BCT757DW.pdf

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

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Product details

Overview

SN74BCT757DW from Texas Instruments is an octal buffer/driver IC with open-collector outputs, designed for memory address bus driving and clock distribution in 3-state systems. It features complementary output-enable inputs (1OE and 2OE), noninverting logic, BiCMOS process technology, and operates over 0°C to 70°C at 4.5–5.5 V supply.

For engineers reviewing the SN74BCT757DW datasheet, SN74BCT757DW pinout, SN74BCT757DW application, or SN74BCT757DW equivalent, key selection factors include its 64 mA sink capability per output, 2.4 ns minimum tPHL propagation delay, open-collector interface compatibility with TTL/CMOS loads, and SOIC-20 package suitability for high-density PCB layouts.

Technical Context

The SN74BCT757DW implements dual 4-bit noninverting buffers with independent active-low and active-high output-enable controls (1OE and 2OE), enabling flexible bus arbitration and timing control. Its BiCMOS design reduces ICCZ quiescent current while maintaining TTL-compatible input thresholds and 5 V rail operation.

Each of the eight outputs is open-collector, allowing wired-AND logic, level translation up to 5.5 V, and direct connection to shared bus lines without contention. The device supports 50 pF capacitive loads with guaranteed tPLH/tPHL switching times under 10.1 ns and 6.9 ns respectively at VCC = 5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures stable operation across standard 5 V TTL/CMOS rails with ±10% tolerance.
Output Sink Current	64 mA per channel - supports direct drive of multiple TTL inputs or termination resistors on parallel buses.
tPHL Propagation Delay	2.4 ns min / 6.6 ns max - enables high-speed address buffering in fast memory subsystems.
Input Thresholds	VIL = 0.8 V, VIH = 2.0 V - guarantees reliable recognition of standard TTL logic levels.
ESD Protection	>2000 V HBM, >200 V MM - meets MIL-STD-883C requirements for robust handling in manufacturing environments.
Operating Temperature	0°C to 70°C - qualified for commercial-grade embedded and industrial control applications.

Pinout & Package

SN74BCT757DW uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.5 mm width, and 2.65 mm max height. Pin 1 is marked by a beveled corner and located at top-left when viewed from top with notch up.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Complementary output-enable controls: 1OE active-low, 2OE active-high - allows simultaneous or staggered enable/disable of two 4-bit groups.
2, 4, 6, 8	1A1–1A4	Noninverting input channels for first 4-bit buffer group - accepts TTL/CMOS logic signals directly.
3, 5, 7, 9	2Y4–2Y1	Open-collector outputs for second 4-bit group - requires external pull-up for logic HIGH; sinks current when asserted.
11, 13, 15, 17	2A1–2A4	Noninverting input channels for second 4-bit buffer group - fully independent from first group.
12, 14, 16, 18	1Y1–1Y4	Open-collector outputs for first 4-bit group - supports wired-AND bus structures and mixed-voltage interfacing.
10, 20	GND, VCC	Power terminals - decoupling capacitor placement near Pin 10 (GND) and Pin 20 (VCC) is critical for noise immunity.

Key Features

Feature	Design Value
BiCMOS process technology	Reduces ICCZ quiescent supply current versus pure bipolar designs, improving system power efficiency during idle states.
Complementary OE inputs	Enables flexible bus control schemes - e.g., one group enabled while the other is tristated, supporting multiplexed address/data paths.
Open-collector outputs	Permits wired-AND logic, level-shifting to higher voltages (up to 5.5 V), and safe sharing of common bus lines without contention.
High sink current (64 mA)	Drives heavy capacitive loads or multiple TTL inputs without external drivers, reducing component count in memory subsystems.
TTL-compatible input thresholds	Ensures interoperability with legacy 5 V logic families without level-shifting circuitry in mixed-signal designs.

Applications

Memory Address Buffering	Bus Transceiver Interface
Use Scenario: Driving 16-bit address bus lines from microcontroller or CPU outputs to SRAM or EPROM chips. IC Role / Device Role / Timing Role: Noninverting octal buffer with open-collector outputs provides fanout expansion and bus isolation. Use Value: 64 mA sink capability per output ensures reliable low-level assertion across long traces and multiple device inputs.	Use Scenario: Interfacing between two asynchronous 8-bit data buses operating at different timing domains. IC Role / Device Role / Timing Role: Dual 4-bit buffer group with independent OE controls enables directional bus gating and timing alignment. Use Value: Complementary OE inputs allow precise control of data flow direction without external logic gates.
Clock Distribution Network	Legacy System Bus Expansion
Use Scenario: Distributing a single clock signal to multiple peripheral devices requiring synchronized timing. IC Role / Device Role / Timing Role: Low-propagation-delay buffer minimizes skew across fanout branches in clock trees. Use Value: 2.4 ns minimum tPHL ensures sub-5 ns edge-to-edge skew across all eight outputs at 5 V.	Use Scenario: Adding additional I/O ports or memory slots to retro-computing or industrial PLC backplanes. IC Role / Device Role / Timing Role: Open-collector outputs interface directly with legacy TTL bus standards and termination schemes. Use Value: Compatibility with 300-mil DIP (N) and SOIC (DW) packages supports both through-hole and surface-mount board upgrades.

Memory Address Buffering

Bus Transceiver Interface

Use Scenario: Driving 16-bit address bus lines from microcontroller or CPU outputs to SRAM or EPROM chips.

IC Role / Device Role / Timing Role: Noninverting octal buffer with open-collector outputs provides fanout expansion and bus isolation.

Use Value: 64 mA sink capability per output ensures reliable low-level assertion across long traces and multiple device inputs.

Use Scenario: Interfacing between two asynchronous 8-bit data buses operating at different timing domains.

IC Role / Device Role / Timing Role: Dual 4-bit buffer group with independent OE controls enables directional bus gating and timing alignment.

Use Value: Complementary OE inputs allow precise control of data flow direction without external logic gates.

Clock Distribution Network

Legacy System Bus Expansion

Use Scenario: Distributing a single clock signal to multiple peripheral devices requiring synchronized timing.

IC Role / Device Role / Timing Role: Low-propagation-delay buffer minimizes skew across fanout branches in clock trees.

Use Value: 2.4 ns minimum tPHL ensures sub-5 ns edge-to-edge skew across all eight outputs at 5 V.

Use Scenario: Adding additional I/O ports or memory slots to retro-computing or industrial PLC backplanes.

IC Role / Device Role / Timing Role: Open-collector outputs interface directly with legacy TTL bus standards and termination schemes.

Use Value: Compatibility with 300-mil DIP (N) and SOIC (DW) packages supports both through-hole and surface-mount board upgrades.

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
SN74LS757N	Bipolar TTL process; higher ICCZ (100 mA typical), slower tPHL (15 ns min), no BiCMOS power advantage.	Limited to lower-speed legacy systems where power efficiency is secondary to availability.	Choose only if legacy board replacement requires identical AC/DC characteristics and BiCMOS is not required.
SN74ACT757DW	Advanced CMOS process; 5 V tolerant inputs, 24 mA sink, faster tPHL (2.1 ns min), but lower drive strength.	Suitable for modern low-power systems with lighter bus loads and stricter EMI requirements.	Select when lower power and improved noise immunity outweigh need for 64 mA sink capability.

Compared with SN74LS757N and SN74ACT757DW, the SN74BCT757DW uniquely balances high sink current (64 mA), BiCMOS efficiency (10 mA ICCZ), and TTL-compatible timing - making it optimal for dense, high-drive memory address buffering where thermal and fanout constraints coexist.

Availability

SN74BCT757DW is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and legacy bus expansion applications requiring stable component supply and long-term industrial availability.

Supply support for SN74BCT757DW 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 with broad industrial, automotive, and communications reach.

The SN74BCT757DW belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered to deliver TTL-compatible performance with CMOS-like power efficiency for high-density memory and bus interface applications.

FAQ

What is the maximum sink current per output of the SN74BCT757DW?

The SN74BCT757DW supports a guaranteed 64 mA low-level output current (IOL) per channel at VCC = 4.5 V and VOL ≤ 0.55 V. This rating enables direct drive of multiple TTL inputs or termination resistors on shared bus lines without external amplification. The absolute maximum rating is 128 mA, but sustained operation above 64 mA is not characterized across temperature and voltage ranges.

Does the SN74BCT757DW require external pull-up resistors on its outputs?

Yes, the SN74BCT757DW has open-collector outputs and requires external pull-up resistors to establish a defined HIGH logic level. Pull-up values depend on bus capacitance and speed requirements; typical values range from 1 kΩ to 10 kΩ to 5 V. Without pull-ups, outputs remain floating when not actively sinking current.

Can the SN74BCT757DW operate at 3.3 V supply voltage?

No, the SN74BCT757DW is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, input thresholds (VIH = 2.0 V, VIL = 0.8 V) may not be reliably met, and output drive strength degrades significantly. For 3.3 V systems, consider TI's ACT or LVC series alternatives instead of the SN74BCT757DW.

What is the function of the complementary OE inputs (1OE and 2OE) on the SN74BCT757DW?

The SN74BCT757DW features two independent output-enable controls: 1OE is active-low and 2OE is active-high. This pairing allows flexible bus arbitration - for example, asserting 1OE low while holding 2OE high disables the first four outputs while enabling the second four. This eliminates need for inverters in dual-bank control schemes.

Is the SN74BCT757DW RoHS compliant and lead-free?

Yes, the SN74BCT757DW is RoHS compliant with NiPdAu (NIPDAU) lead finish and meets JEDEC Level-1 moisture sensitivity requirements. Its SOIC (DW) package is rated for peak reflow temperatures up to 260°C, and TI confirms full compliance with EU RoHS Directive 2011/65/EU as documented in the official packaging addendum.

SN74BCT757DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74BCT

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

Packaging:: Bulk

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

SN74BCT757DW FAQ

1.How can I place an order for SN74BCT757DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74BCT757DW 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 SN74BCT757DW reliable?

The price and inventory of SN74BCT757DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT757DW is usually 5 days.

3.What payment methods are accepted for SN74BCT757DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT757DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74BCT757DW?

SN74BCT757DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74BCT757DW 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 SN74BCT757DW?

For technical support, including SN74BCT757DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT757DW requirements.

6.How does Aetrix verify that SN74BCT757DW is sourced from the original manufacturer or authorized distributors?

All SN74BCT757DW 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 SN74BCT757DW meets industry standards.

7.What is the process for return or replacement of SN74BCT757DW?

All SN74BCT757DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT757DW, 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 SN74BCT757DW part is unused and in its original packaging.

Return procedure for SN74BCT757DW:

1.Submit a request within 90 days.

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

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