Texas Instruments 74ACT16861DL

Overview

74ACT16861DL 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 and embedded systems. It operates over –40°C to 85°C, supports 5-V supply (4.5–5.5 V), delivers ±24 mA output drive, and features flow-through pinout for optimized PCB layout.

For engineers reviewing the 74ACT16861DL datasheet, 74ACT16861DL pinout, 74ACT16861DL application, or 74ACT16861DL equivalent, key selection criteria include its dual 10-bit or single 20-bit configuration, TTL-compatible inputs, distributed V_CC/GND for noise reduction, and SSOP-56 package compatibility with high-density board designs.

Technical Context

The 74ACT16861DL implements two independent 10-bit transceiver sections, each controlled by separate OEAB/OEBA inputs to enable A→B, B→A, isolation, or latched operation. Its EPIC™ 1-µm CMOS process ensures latch-up immunity of 500 mA at 125°C and supports fast switching with t_PLH/t_PHL ≤ 10.4 ns at V_CC = 5 V.

Input logic thresholds are TTL-compatible (V_IL ≤ 0.8 V, V_IH ≥ 2 V), and outputs drive bus lines directly with 3-state capability. The distributed power/ground pin architecture minimizes simultaneous switching noise, while the shrink SSOP (DL) package enables twice the I/O density of standard SOIC in the same PCB area.

Key Specifications

Pinout & Package

74ACT16861DL is housed in a 56-pin Shrink Plastic Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil pin pitch, with exposed thermal pad not present. Pin 1 orientation follows Q1 quadrant per tape-and-reel specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT16245DLR and 74ACT16835DLR, the 74ACT16861DL uniquely delivers noninverting 20-bit functionality in a single SSOP-56 package-enabling full-width bus bridging without bit-width compromise or polarity correction overhead.

Availability

74ACT16861DL is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus extension, automated test equipment fixture interface, and programmable logic controller I/O module applications requiring stable component supply and long-term obsolescence management.

Supply support for 74ACT16861DL 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 specializing in analog, embedded processing, and logic solutions, with decades of leadership in industrial-grade interface ICs.

The 74ACT16861DL belongs to TI's Widebus™ family of high-speed CMOS transceivers, engineered specifically for noise-resilient, high-density parallel bus interfacing in industrial control and instrumentation systems.

FAQ

What is the operating temperature range for the 74ACT16861DL?

The 74ACT16861DL is characterized for operation from –40°C to +85°C, making it suitable for commercial and industrial environments where ambient temperatures exceed consumer-grade limits. This range is explicitly defined in the recommended operating conditions table of the SCAS197B datasheet and verified across production lots. The 74ACT16861DL maintains full 3-state functionality and timing compliance across this entire span without derating.

Does the 74ACT16861DL support true bidirectional data flow on the same pins?

Yes-the 74ACT16861DL supports true bidirectional operation: each A-side pin (e.g., 1A1–1A10) and corresponding B-side pin (e.g., 1B1–1B10) functions as either input or output depending on the logic state of OEAB and OEBA. When OEAB is low and OEBA is high, data flows A→B; reversing those enables B→A. The 74ACT16861DL does not require external direction-control logic or separate transmit/receive lines.

What package type and pin count does the 74ACT16861DL use?

The 74ACT16861DL uses a 56-pin Shrink Plastic Small-Outline Package (SSOP-DL), with 300-mil body width and 25-mil center-to-center pin spacing. This is confirmed in the "PACKAGE OPTION ADDENDUM" and "FUNCTION TABLE" sections of the official Texas Instruments datasheet SCAS197B. The DL package provides double the I/O density of standard SOIC while maintaining compatibility with automated SMT assembly.

Can the 74ACT16861DL be used as two independent 10-bit transceivers?

Yes-the 74ACT16861DL is internally partitioned into two fully independent 10-bit transceiver sections (1A/1B and 2A/2B), each with dedicated OEAB and OEBA inputs. This allows concurrent A↔B communication on both halves-for example, transferring status data on one 10-bit channel while streaming sensor data on the other-without timing interaction or shared control constraints. The 74ACT16861DL's functional partitioning is explicitly documented in the logic diagram and function table.

What is the maximum output current rating for the 74ACT16861DL?

The 74ACT16861DL guarantees ±24 mA DC output current per I/O pin under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = –40°C to +85°C), as specified in the "recommended operating conditions" table. This rating ensures reliable driving of multiple TTL loads or terminated transmission lines. Absolute maximum ratings permit brief ±50 mA pulses, but sustained operation must remain within the ±24 mA limit to maintain VOH/VOL specifications and avoid thermal overload of the 74ACT16861DL.