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Texas Instruments 74ACT16861DLRG4
- Part No.:
- 74ACT16861DLRG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16861DLRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
74ACT16861DLRG4 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 telecom backplane systems. It operates at 4.5–5.5 V, supports ±24 mA output drive, delivers tPLH/tPHL ≤ 10.4 ns at 5 V, and features flow-through pinout for optimized PCB layout.
For engineers reviewing the 74ACT16861DLRG4 datasheet, 74ACT16861DLRG4 pinout, 74ACT16861DLRG4 application, or 74ACT16861DLRG4 equivalent, this device is selected for high-speed TTL-compatible bus isolation, dual 10-bit or unified 20-bit mode operation, and noise-minimized distributed VCC/GND pin architecture in space-constrained SSOP-56 layouts.
Technical Context
The 74ACT16861DLRG4 implements two independent 10-bit transceiver sections, each controlled by dedicated OEAB (A→B enable) and OEBA (B→A enable) inputs. Its logic allows latch-through (OEAB=OEBA=L), unidirectional A→B (OEAB=L, OEBA=H), B→A (OEAB=H, OEBA=L), or full bus isolation (OEAB=OEBA=H).
Based on TI's EPIC™ 1-µm CMOS process, it achieves 500-mA latch-up immunity at 125°C and uses distributed power/ground pins across the 56-pin DL package to suppress high-speed switching noise-critical for stable operation in multi-drop bus environments with fast edge rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS logic rails without level-shifting. |
| Output Drive | ±24 mA - sufficient to directly drive terminated 50-Ω transmission lines or multiple TTL loads on shared buses. |
| Propagation Delay | tPLH/tPHL ≤ 10.4 ns @ 5 V - enables reliable 50+ MHz bus clocking in synchronous backplane designs. |
| 3-State Enable Time | tPZH/tPZL ≤ 10 ns - minimizes bus contention window during direction switching in dynamic bus arbitration. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interfaces directly with legacy 74LS/74F logic without pull-ups or translators. |
| Power Dissipation | 1.4 W max @ TA = 55°C - defines thermal derating limits for dense board placement in enclosed enclosures. |
| Operating Temperature | –40°C to +85°C - qualified for commercial/industrial ambient conditions in base stations and control modules. |
Pinout & Package
74ACT16861DLRG4 is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil pin pitch, with gull-wing leads and pin 1 quadrant Q1 orientation per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB | A→B Output Enable (active-low) | Controls 10-bit A-bus-to-B-bus data flow; low enables drivers, high places B outputs in high-impedance state. |
| 1OEBA, 2OEBA | B→A Output Enable (active-low) | Controls 10-bit B-bus-to-A-bus data flow; low enables drivers, high isolates A bus from B bus. |
| 1A1–1A10, 2A1–2A10 | A-side Data Inputs/Outputs | Bidirectional I/O ports for first and second 10-bit A bus segments; internally connected to transceiver core. |
| 1B1–1B10, 2B1–2B10 | B-side Data Inputs/Outputs | Bidirectional I/O ports for first and second 10-bit B bus segments; electrically isolated when OE is high. |
| VCC (pins 7, 22, 36, 46) | Power Supply | Distributed VCC pins reduce simultaneous switching noise and improve PDN impedance across high-frequency operation. |
| GND (pins 4, 11, 18, 25, 33, 40, 47, 54) | Ground Reference | Eight GND pins interspersed with VCC and I/O provide low-inductance return paths and minimize ground bounce. |
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 / single 20-bit configuration | Flexible bus segmentation: use as two independent transceivers (e.g., separate address/data paths) or one wide interface. |
| EPIC™ 1-µm CMOS process | Enables high speed with low static current (ICC ≤ 80 µA) and robust latch-up immunity (500 mA @ 125°C). |
| TTL-compatible inputs | Accepts standard TTL logic thresholds without external biasing-reduces BOM count and simplifies interface design. |
| 3-state output control per section | Independent OEAB/OEBA pins allow fine-grained bus arbitration and prevent contention during hot-swap or partial system reset. |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Bidirectional data routing between CPU module and peripheral carrier boards in modular telecom chassis. IC Role / Device Role / Timing Role: 20-bit bus transceiver enabling A↔B communication with direction control via FPGA-configured OE signals. Use Value: Flow-through pinout reduces trace length mismatch; ±24 mA drive sustains signal integrity over 15-cm backplane stubs at 40 MHz. |
Use Scenario: Isolating field I/O bus from controller bus during firmware update or fault recovery in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-section transceiver used as two independent 10-bit isolators, each controlled by watchdog-timed OE signals. Use Value: Independent OEAB/OEBA pins allow staggered enable/disable sequencing to prevent bus glitches during reconfiguration. |
| Test Equipment Bus Arbitration | Legacy System Interfacing |
|
Use Scenario: Sharing a common GPIB or VXI data bus among multiple instrument modules with dynamic master/slave assignment. IC Role / Device Role / Timing Role: 20-bit transceiver operating in B→A or A→B mode under microcontroller command to route test vectors or results. Use Value: tPZH/tPZL ≤ 10 ns ensures sub-100 ns bus turnaround-critical for high-throughput automated test sequences. |
Use Scenario: Bridging 5-V TTL-based legacy control logic (e.g., 74LS series) to modern 5-V CMOS processor buses. IC Role / Device Role / Timing Role: Level-translation-capable transceiver providing bidirectional voltage-compatible interconnect without discrete resistors. Use Value: TTL-input thresholds (VIH = 2 V, VIL = 0.8 V) guarantee reliable recognition of LS-family outputs at full speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT16861DLR | Same die, identical pinout and specs; R suffix denotes tape-and-reel packaging (vs. G4's green/RoHS-compliant finish). | No functional difference; selected when standard RoHS-compliant reel packaging is preferred over G4's specific finish. | Drop-in replacement if packaging format aligns with assembly line requirements. |
| 74ACT16245DLR | 16-bit (not 20-bit), different pinout (56-pin but incompatible terminal mapping), same VCC/speed range and OE architecture. | Suitable only where 16-bit width suffices; requires PCB redesign due to non-overlapping A/B port assignments. | Consider when bus width reduction is acceptable and layout revision is feasible. |
Compared with SN74ACT16861DLR, the 74ACT16861DLRG4 offers identical electrical behavior with verified RoHS-compliant NIPDAU finish; versus 74ACT16245DLR, it provides 4 additional data bits and native 20-bit flow-through routing-eliminating glue logic in wide-data-path systems.
Availability
74ACT16861DLRG4 is available at Aetrix Electronics and suitable for telecom backplane interfaces, industrial PLC I/O expansion, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for 74ACT16861DLRG4 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 high-reliability interface ICs.
The 74ACT16861DLRG4 belongs to TI's Widebus™ family of high-speed bus transceivers, engineered for noise-resilient, high-density backplane and board-level data routing in industrial and communications infrastructure.
FAQ
What is the operating temperature range for the 74ACT16861DLRG4?
The 74ACT16861DLRG4 is characterized for operation from –40°C to +85°C, making it suitable for commercial and industrial environments including base station cabinets and factory automation controllers. This range is validated per TI's recommended operating conditions and confirmed in the SCAS197B datasheet revision November 1996.
Does the 74ACT16861DLRG4 support independent 10-bit operation?
Yes, the 74ACT16861DLRG4 contains two functionally independent 10-bit transceiver sections-labeled "1" and "2"-each with dedicated OEAB and OEBA inputs. This allows concurrent A↔B data flow on separate 10-bit segments, such as address and data buses, without internal crosstalk or timing coupling.
What package type is used for the 74ACT16861DLRG4?
The 74ACT16861DLRG4 uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 25-mil pin pitch and 300-mil body width. Its pin 1 orientation follows quadrant Q1 per TI's tape-and-reel specification, and it features eight GND and four VCC pins for low-noise power distribution.
How does the 74ACT16861DLRG4 handle bus isolation?
The 74ACT16861DLRG4 achieves full bus isolation when both OEAB and OEBA inputs are held high, placing all A- and B-side outputs in high-impedance state. This electrically disconnects the A and B buses, preventing leakage, contention, or signal corruption during standby or fault conditions-verified in the device's FUNCTION TABLE.
Is the 74ACT16861DLRG4 RoHS compliant?
Yes, the 74ACT16861DLRG4 is RoHS compliant, with lead finish specified as NIPDAU (Nickel/Palladium/Gold) and MSL rating Level-1-260°C-UNLIM. This compliance is documented in TI's official Packaging Information addendum dated June 2026, confirming suitability for modern environmentally regulated manufacturing.
74ACT16861DLRG4 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:
- Discontinued at Digi-Key
- 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
74ACT16861DLRG4 FAQ
1.How can I place an order for 74ACT16861DLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16861DLRG4 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 74ACT16861DLRG4 reliable?
The price and inventory of 74ACT16861DLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16861DLRG4 is usually 5 days.
3.What payment methods are accepted for 74ACT16861DLRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16861DLRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16861DLRG4?
74ACT16861DLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16861DLRG4 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 74ACT16861DLRG4?
For technical support, including 74ACT16861DLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16861DLRG4 requirements.
6.How does Aetrix verify that 74ACT16861DLRG4 is sourced from the original manufacturer or authorized distributors?
All 74ACT16861DLRG4 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 74ACT16861DLRG4 meets industry standards.
7.What is the process for return or replacement of 74ACT16861DLRG4?
All 74ACT16861DLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16861DLRG4, 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 74ACT16861DLRG4 part is unused and in its original packaging.
Return procedure for 74ACT16861DLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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