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Texas Instruments 74ACT16861DLR

Name: 74ACT16861DLR
Brand: Texas Instruments
SKU: 74ACT16861DLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACT16861DLR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: 74ACT16861DLR.pdf

Description:: IC TXRX NON-INVERT 5.5V 56SSOP

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Product details

Overview

74ACT16861DLR from Texas Instruments is a noninverting 20-bit bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial control and legacy computing systems. It operates at 4.5–5.5 V, supports ±24 mA output drive, delivers 2.9–11.1 ns propagation delay, and features dual 10-bit sections with independent OEAB/OEBA controls for flexible bus isolation.

For engineers reviewing the 74ACT16861DLR datasheet, 74ACT16861DLR pinout, 74ACT16861DLR application, or 74ACT16861DLR equivalent, key selection criteria include TTL-compatible inputs, flow-through pin architecture for PCB layout optimization, distributed V_CC/GND for noise reduction, and -40°C to +85°C industrial temperature rating.

Technical Context

The 74ACT16861DLR implements two independent 10-bit transceiver sections, each with separate output-enable inputs (OEAB and OEBA) enabling A→B, B→A, or high-impedance isolation modes per section. Its logic-level compatibility with TTL ensures seamless integration into mixed-voltage 5-V systems without level-shifting.

Based on TI's EPIC™ 1-µm CMOS process, it achieves 500-mA latch-up immunity at 125°C and supports 50 pF load capacitance at 1 MHz. The shrink SSOP (DL) package features 56 pins with 25-mil center-to-center spacing and distributed power/ground pins to minimize simultaneous switching noise.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures stable operation across standard 5-V rail tolerances in industrial environments.
Output Drive	±24 mA - Sufficient to directly drive terminated bus lines without external buffers.
Propagation Delay	2.9 ns (min) to 11.1 ns (max) - Enables reliable timing in high-speed synchronous and asynchronous bus interfaces.
Input Compatibility	TTL-voltage compatible (V_IL ≤ 0.8 V, V_IH ≥ 2 V) - Interoperates with legacy TTL logic without interface circuitry.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded systems and control equipment.
Power Dissipation	1.4 W max (at T_A = 55°C) - Defines thermal derating requirements for board-level layout and airflow planning.
3-State Leakage	±5 µA (I_OZ) - Guarantees minimal bus loading during isolation, preserving signal integrity on shared lines.

Pinout & Package

74ACT16861DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil pin pitch, with exposed thermal pad not electrically connected. Pin 1 located in Q1 quadrant per tape-and-reel specification.

Pin/Terminal	Circuit Role	Design Meaning
1OEAB, 2OEAB, 1OEBA, 2OEBA	Output-enable control inputs	Active-low enables bidirectional data flow per 10-bit section; independent control allows partial bus isolation.
1A1–1A10, 2A1–2A10	Port A data inputs/outputs	First and second 10-bit input/output group on A-side; TTL-compatible I/O capable of driving 50-pF loads.
1B1–1B10, 2B1–2B10	Port B data inputs/outputs	Corresponding 10-bit I/O group on B-side; identical electrical specs to A-side for symmetrical bus interfacing.
V_CC (Pins 7, 22, 36, 51)	Power supply	Distributed V_CC pins reduce IR drop and high-frequency impedance, improving noise immunity.
GND (Pins 4, 11, 18, 25, 32, 39, 46, 54)	Ground reference	Eight GND pins interspersed with V_CC and I/O provide low-inductance return paths for switching currents.

Key Features

Feature	Design Value
Flow-through architecture	Input and output pins arranged on opposite sides of package to eliminate layer-crossing traces and reduce signal skew.
Dual 10-bit section control	Independent OEAB/OEBA inputs per section enable selective activation-e.g., isolate one 10-bit segment while passing data on the other.
EPIC™ 1-µm CMOS process	Delivers 500-mA latch-up immunity at 125°C, meeting stringent reliability requirements for industrial power cycling.
3-state output leakage	≤ ±5 µA ensures negligible DC loading on idle buses, critical for multi-drop wired-AND or shared-control applications.
TTL-input compatibility	V_IH = 2 V min / V_IL = 0.8 V max eliminates need for external level shifters when interfacing with legacy 74LS/74ALS devices.

Applications

Industrial Backplane Interface	Legacy System Bus Extension
Use Scenario: Extending ISA or VMEbus segments between controller and peripheral modules in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional 20-bit transceiver isolating CPU and I/O bus domains while maintaining timing-critical address/data handshaking. Use Value: Flow-through pinout reduces trace length mismatch; ±24 mA drive sustains signal integrity over 15 cm backplane runs at 10 MHz.	Use Scenario: Adding memory-mapped peripherals to aging 80286/80386-based embedded systems with limited board space. IC Role / Device Role / Timing Role: Noninverting transceiver enabling clean A/B bus separation during DMA cycles and interrupt servicing. Use Value: Independent 10-bit OE controls allow concurrent access to two peripheral banks without full bus arbitration overhead.
Test Equipment Data Path	Automated Test Fixture Interface
Use Scenario: Routing parallel digital stimulus/response signals between FPGA pattern generator and DUT in ATE platforms. IC Role / Device Role / Timing Role: High-speed 20-bit buffer with sub-12 ns t_PHL/t_PLH supporting deterministic timing margins at 25 MHz test clock rates. Use Value: Distributed V_CC/GND minimizes ground bounce during simultaneous 20-bit transitions, preserving measurement accuracy.	Use Scenario: Isolating fixture control logic from device-under-test I/O during functional testing of ASICs or microcontrollers. IC Role / Device Role / Timing Role: 3-state transceiver acting as programmable bus gate, enabling safe hot-plug of test adapters without bus contention. Use Value: ≤ ±5 µA off-state leakage prevents false triggering of DUT inputs during setup/teardown phases.

Industrial Backplane Interface

Legacy System Bus Extension

Use Scenario: Extending ISA or VMEbus segments between controller and peripheral modules in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Bidirectional 20-bit transceiver isolating CPU and I/O bus domains while maintaining timing-critical address/data handshaking.

Use Value: Flow-through pinout reduces trace length mismatch; ±24 mA drive sustains signal integrity over 15 cm backplane runs at 10 MHz.

Use Scenario: Adding memory-mapped peripherals to aging 80286/80386-based embedded systems with limited board space.

IC Role / Device Role / Timing Role: Noninverting transceiver enabling clean A/B bus separation during DMA cycles and interrupt servicing.

Use Value: Independent 10-bit OE controls allow concurrent access to two peripheral banks without full bus arbitration overhead.

Test Equipment Data Path

Automated Test Fixture Interface

Use Scenario: Routing parallel digital stimulus/response signals between FPGA pattern generator and DUT in ATE platforms.

IC Role / Device Role / Timing Role: High-speed 20-bit buffer with sub-12 ns t_PHL/t_PLH supporting deterministic timing margins at 25 MHz test clock rates.

Use Value: Distributed V_CC/GND minimizes ground bounce during simultaneous 20-bit transitions, preserving measurement accuracy.

Use Scenario: Isolating fixture control logic from device-under-test I/O during functional testing of ASICs or microcontrollers.

IC Role / Device Role / Timing Role: 3-state transceiver acting as programmable bus gate, enabling safe hot-plug of test adapters without bus contention.

Use Value: ≤ ±5 µA off-state leakage prevents false triggering of DUT inputs during setup/teardown phases.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT16245DLR	16-bit (not 20-bit); identical DL package, same V_CC/I/O specs, but lacks dual-section OE control.	Suitable only where 16-bit width suffices and unified OE suffices; cannot replicate independent 10-bit gating of 74ACT16861DLR.	Select when pin count and bus width match, but avoid if split-section isolation is required.
74ACT16835DLR	Inverting transceiver; otherwise matches 74ACT16861DLR in pinout, timing, and drive strength.	Requires logic inversion in upstream/downstream design; unsuitable where signal polarity must be preserved end-to-end.	Choose only if system-level inversion is acceptable or already compensated elsewhere in the data path.

Compared with SN74ACT16245DLR and 74ACT16835DLR, the 74ACT16861DLR uniquely provides 20-bit width with per-10-bit output-enable control-enabling granular bus segmentation unattainable with 16-bit or inverting alternatives.

Availability

74ACT16861DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, automated test fixture interfaces, and high-reliability data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for 74ACT16861DLR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The 74ACT16861DLR belongs to TI's Widebus™ family of high-speed CMOS bus interface ICs, engineered specifically for robust, low-noise bidirectional data transfer in space-constrained industrial and instrumentation systems.

FAQ

What is the operating temperature range for the 74ACT16861DLR?

The 74ACT16861DLR is characterized for operation from –40°C to +85°C, making it suitable for industrial environments where ambient temperatures exceed commercial-grade limits. This range is validated per TI's SCAS197B datasheet and confirmed in the packaging addendum. The 74ACT16861DLR does not support the extended –55°C to +125°C military range-that applies only to the 54ACT16861 variant.

Does the 74ACT16861DLR support true bidirectional data flow without external direction control logic?

Yes-the 74ACT16861DLR enables bidirectional operation using only its four output-enable inputs (1OEAB, 2OEAB, 1OEBA, 2OEBA). When 1OEAB is low and 1OEBA is high, data flows from Port A to Port B; reversing those states enables B-to-A transfer. No external direction line or control state machine is needed. This behavior is defined in the FUNCTION TABLE on page 2 of the 74ACT16861DLR datasheet.

What package type and pin count does the 74ACT16861DLR use?

The 74ACT16861DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL), with 300-mil body width and 25-mil center-to-center pin pitch. This is explicitly stated in the "Package Options" section of the datasheet and confirmed in TI's Packaging Information addendum. The "DL" in the part number directly references this TI-specific SSOP variant.

Can the 74ACT16861DLR be used as two independent 10-bit transceivers?

Yes-the 74ACT16861DLR is internally partitioned into two functionally identical 10-bit sections (1A/1B and 2A/2B), each with dedicated OEAB and OEBA inputs. This allows simultaneous but independent control: for example, enabling 1A↔1B while holding 2A/2B in high-impedance. The datasheet confirms this capability in the first paragraph of the Description section and illustrates it in the logic diagram.

What is the maximum capacitive load the 74ACT16861DLR can drive while maintaining specified timing?

The 74ACT16861DLR is characterized for 50 pF load capacitance, as specified in the "Operating Characteristics" table (page 4) and used in all switching parameter measurements (t_PLH, t_PHL, etc.). Driving loads beyond 50 pF will increase propagation delay and may violate setup/hold timing in high-speed systems. The 74ACT16861DLR's C_io = 17 pF (per port) further indicates its optimized drive strength for typical PCB trace + connector + receiver loading.

74ACT16861DLR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 56-BSSOP (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 10

Input Type:: -

Output Type:: 3-State

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

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 56-SSOP

74ACT16861DLR FAQ

1.How can I place an order for 74ACT16861DLR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACT16861DLR 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 74ACT16861DLR reliable?

The price and inventory of 74ACT16861DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16861DLR is usually 5 days.

3.What payment methods are accepted for 74ACT16861DLR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16861DLR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ACT16861DLR?

74ACT16861DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACT16861DLR 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 74ACT16861DLR?

For technical support, including 74ACT16861DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16861DLR requirements.

6.How does Aetrix verify that 74ACT16861DLR is sourced from the original manufacturer or authorized distributors?

All 74ACT16861DLR 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 74ACT16861DLR meets industry standards.

7.What is the process for return or replacement of 74ACT16861DLR?

All 74ACT16861DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16861DLR, 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 74ACT16861DLR part is unused and in its original packaging.

Return procedure for 74ACT16861DLR:

1.Submit a request within 90 days.

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

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