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

Texas Instruments SN74ABT861DWR

Name: SN74ABT861DWR
Brand: Texas Instruments
SKU: SN74ABT861DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT861DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74ABT861DWR.pdf

Description:: IC TXRX NON-INVERT 5.5V 24SOIC

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Product details

Overview

SN74ABT861DWR from Texas Instruments is a 10-bit noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial control and embedded system backplanes. It operates from 4.5 V to 5.5 V, delivers ±32-mA high-drive outputs, supports –40°C to 85°C temperature range, and features high-impedance state during power-up/down for hot-swap compatibility.

For engineers reviewing the SN74ABT861DWR datasheet, SN74ABT861DWR pinout, SN74ABT861DWR application, or SN74ABT861DWR equivalent, key selection criteria include dual-output-enable control (OEAB/OEBA), latch capability (L = L), isolation mode (H = H), and SOIC-24 package compatibility with legacy 5-V TTL/CMOS systems.

Technical Context

The SN74ABT861DWR implements independent OEAB and OEBA inputs to enable bidirectional data flow: OEAB low enables A→B transmission, OEBA low enables B→A transmission. Its EPIC-II^B BiCMOS process reduces dynamic power while maintaining TTL-compatible input thresholds and 5-V supply operation.

It provides true 3-state output control with guaranteed high-impedance behavior below 2.1 V V_CC, and includes latch-up immunity exceeding 500 mA per JESD-17. Unused pins must be tied high or low to prevent floating, and all I/Os support 2000-V HBM ESD protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of nominal 5% supply variation.
Output Drive	–32 mA I_OH, 64 mA I_OL - drives heavy capacitive loads (e.g., >100 pF) without signal degradation in backplane applications.
Propagation Delay	1 ns (min) to 5.2 ns (max) at V_CC = 5 V - supports >100-MHz bus toggle rates in synchronous designs with margin.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - ensures robust noise margin against TTL and CMOS logic families.
Power-Up State	High-impedance when V_CC < 2.1 V - prevents bus contention during power sequencing in multi-rail systems.
ESD Rating	>2000 V HBM - meets MIL-STD-883 Class 3015 requirements for industrial handling and board assembly.
Operating Temperature	–40°C to +85°C - qualified for commercial/industrial environments including factory automation and telecom line cards.

Pinout & Package

SN74ABT861DWR is housed in a 24-pin SOIC (DW) package with 300-mil body width, JEDEC MS-013 compliant, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH).

Pin/Terminal	Circuit Role	Design Meaning
1, 23	OEBA	Output-enable for B-to-A direction; low enables B-bus data onto A-bus.
10, 13	OEAB	Output-enable for A-to-B direction; low enables A-bus data onto B-bus.
2–9, 11–12, 14–22	A1–A10, B1–B10	Two independent 10-bit bidirectional data ports; no internal direction register - direction controlled solely by OE states.
12, 24	GND / V_CC	Dual power pins reduce ground bounce; V_CC pin adjacent to GND minimizes supply loop inductance.

Key Features

Feature	Design Value
Independent Dual OE Control	Enables simultaneous A→B and B→A traffic arbitration without external logic or timing constraints.
Hot-Swap Safe Power Sequencing	Guaranteed high-Z state below 2.1 V V_CC eliminates bus contention during partial power-up in modular systems.
High-Drive Outputs	64-mA sink capability allows direct driving of multiple TTL loads or long PCB traces without buffers.
Latch Mode (OEAB = OEBA = L)	Maintains bidirectional data integrity across both buses during transient control loss or reset events.
BiCMOS EPIC-II^B Process	Reduces static current to <250 µA in disabled state while preserving fast edge rates and low propagation skew.

Applications

Industrial Backplane Interface	Legacy System Bus Extension
Use Scenario: Interfacing a modern microcontroller module to an older ISA-style parallel backplane with 10-bit address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus buffering with independent direction control per transaction cycle. Use Value: Eliminates need for discrete direction-control logic and supports hot-plug insertion of expansion cards without bus lockup.	Use Scenario: Extending a 5-V TTL CPU bus across two PCBs via ribbon cable in test equipment rack systems. IC Role / Device Role / Timing Role: Signal integrity-preserving transceiver with matched t_PLH/t_PHL (≤5.3 ns) and low skew (<0.5 ns). Use Value: Maintains setup/hold timing margins over 30-cm cables at 25-MHz bus clock rates.
Programmable Logic I/O Expansion	Isolated Subsystem Communication
Use Scenario: Adding 10-bit parallel I/O to an FPGA-based motion controller where GPIO pins are constrained. IC Role / Device Role / Timing Role: Synchronous data latching interface with OEAB/OEBA synchronized to FPGA control signals. Use Value: Enables full-duplex handshake-free data exchange using only two control lines instead of dedicated R/W and DIR signals.	Use Scenario: Isolating a sensor acquisition subsystem from a main processor bus during fault conditions. IC Role / Device Role / Timing Role: Controlled isolation gate activated by setting OEAB = OEBA = H to disconnect both buses. Use Value: Prevents fault propagation while retaining ability to re-enable communication without reset or power cycle.

Industrial Backplane Interface

Legacy System Bus Extension

Use Scenario: Interfacing a modern microcontroller module to an older ISA-style parallel backplane with 10-bit address/data multiplexing.

IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus buffering with independent direction control per transaction cycle.

Use Value: Eliminates need for discrete direction-control logic and supports hot-plug insertion of expansion cards without bus lockup.

Use Scenario: Extending a 5-V TTL CPU bus across two PCBs via ribbon cable in test equipment rack systems.

IC Role / Device Role / Timing Role: Signal integrity-preserving transceiver with matched t_PLH/t_PHL (≤5.3 ns) and low skew (<0.5 ns).

Use Value: Maintains setup/hold timing margins over 30-cm cables at 25-MHz bus clock rates.

Programmable Logic I/O Expansion

Isolated Subsystem Communication

Use Scenario: Adding 10-bit parallel I/O to an FPGA-based motion controller where GPIO pins are constrained.

IC Role / Device Role / Timing Role: Synchronous data latching interface with OEAB/OEBA synchronized to FPGA control signals.

Use Value: Enables full-duplex handshake-free data exchange using only two control lines instead of dedicated R/W and DIR signals.

Use Scenario: Isolating a sensor acquisition subsystem from a main processor bus during fault conditions.

IC Role / Device Role / Timing Role: Controlled isolation gate activated by setting OEAB = OEBA = H to disconnect both buses.

Use Value: Prevents fault propagation while retaining ability to re-enable communication without reset or power cycle.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT245DW	8-bit, single-directional OE control (DIR pin), lower drive (–15 mA/48 mA), same SOIC-20 package.	Lacks independent A↔B arbitration; requires external direction logic for bidirectional use.	Select when bus width is ≤8 bits and direction changes infrequently (e.g., memory-mapped peripherals).
SN74LVC8T245PW	8-bit, dual-supply (1.65–5.5 V), 32-mA drive, TSSOP-24, supports mixed-voltage translation.	Not pin-compatible; lacks latch mode and hot-swap high-Z guarantee below 2.1 V.	Select for low-voltage systems (e.g., 3.3-V MCU interfacing to 5-V peripherals) where voltage translation is required.

Compared with SN74ABT245DW and SN74LVC8T245PW, the SN74ABT861DWR uniquely supports 10-bit bidirectional arbitration with independent OE control, guaranteed power-up high-Z, and industrial temperature range - making it irreplaceable in legacy 5-V backplane and hot-swap-capable subsystem isolation roles.

Availability

SN74ABT861DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and programmable logic I/O expansion requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT861DWR 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 specializing in analog, embedded processing, and logic solutions, with decades of heritage in industry-standard logic families.

The ABT logic family, including SN74ABT861DWR, was engineered for high-speed, high-drive 5-V TTL-compatible applications in industrial control, test equipment, and communications infrastructure.

FAQ

What is the function of OEAB and OEBA on the SN74ABT861DWR?

The SN74ABT861DWR uses OEAB (pin 10) to enable data flow from A bus to B bus when low, and OEBA (pin 1) to enable data flow from B bus to A bus when low. Both can be low simultaneously to latch data bidirectionally (A = B), or both high to isolate the buses. This dual-OE architecture eliminates external direction logic in dynamic bus-sharing applications.

Does the SN74ABT861DWR support hot-swap insertion?

Yes, the SN74ABT861DWR guarantees high-impedance outputs when V_CC is below 2.1 V, preventing bus contention during partial power-up. For reliable hot-swap operation above 2.1 V, OEAB and OEBA must be pulled high via resistors until system control asserts valid enable states - a design requirement explicitly documented in the SN74ABT861DWR datasheet.

What is the maximum capacitive load the SN74ABT861DWR can drive reliably?

The SN74ABT861DWR is characterized with CL = 50 pF in its switching specifications, but its ±32-mA/±64-mA drive strength supports loads up to 100 pF while maintaining t_PLH/t_PHL ≤ 7 ns. Driving heavier loads requires verifying signal integrity via IBIS simulation or bench measurement, as propagation delay increases linearly with load capacitance per the device's output impedance profile.

Can unused A or B port pins on the SN74ABT861DWR be left floating?

No - the SN74ABT861DWR datasheet mandates that all unused inputs (including A and B port pins) be tied either high or low. Floating inputs cause increased ICC current, potential oscillation, and unpredictable 3-state behavior due to internal BiCMOS threshold sensitivity. This requirement applies regardless of OE state and is critical for stable operation in industrial environments.

Is the SN74ABT861DWR pin-compatible with other ABT-series transceivers?

The SN74ABT861DWR is not pin-compatible with 8-bit ABT transceivers like SN74ABT245DW (SOIC-20) or SN74ABT543DW (SOIC-24 with different pinout). Its 24-pin SOIC layout is unique to the 10-bit ABT861 family, with dedicated A1–A10/B1–B10 mapping and dual OE placement. Pin compatibility is limited to SN54ABT861 variants in JT or FK packages, not cross-family replacements.

SN74ABT861DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ABT

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 10

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SOIC

SN74ABT861DWR FAQ

1.How can I place an order for SN74ABT861DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT861DWR 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 SN74ABT861DWR reliable?

The price and inventory of SN74ABT861DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT861DWR is usually 5 days.

3.What payment methods are accepted for SN74ABT861DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT861DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ABT861DWR?

SN74ABT861DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT861DWR 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 SN74ABT861DWR?

For technical support, including SN74ABT861DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT861DWR requirements.

6.How does Aetrix verify that SN74ABT861DWR is sourced from the original manufacturer or authorized distributors?

All SN74ABT861DWR 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 SN74ABT861DWR meets industry standards.

7.What is the process for return or replacement of SN74ABT861DWR?

All SN74ABT861DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT861DWR, 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 SN74ABT861DWR part is unused and in its original packaging.

Return procedure for SN74ABT861DWR:

1.Submit a request within 90 days.

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

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