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Texas Instruments SN74ABT861NT
- Part No.:
- SN74ABT861NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT861NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,982
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Product details
Overview
SN74ABT861NT 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 and embedded systems. It supports ±32-mA high-drive outputs, operates from 4.5 V to 5.5 V, features high-impedance state during power-up/down (VCC ≤ 2.1 V), and is rated for –40°C to 85°C operation.
For engineers reviewing the SN74ABT861NT datasheet, SN74ABT861NT pinout, SN74ABT861NT application, or SN74ABT861NT equivalent, key selection factors include its dual-output-enable control (OEAB/OEBA), latch capability (L/L mode), isolation behavior (H/H mode), and NT-package thermal performance (θJA = 67°C/W).
Technical Context
The SN74ABT861NT implements independent directional control via OEAB (A→B enable) and OEBA (B→A enable), supporting four functional modes: A-to-B transmission, B-to-A transmission, bus isolation, and latched bidirectional coupling (A = B). Its EPIC-IIB BiCMOS process enables low-power operation while delivering high-current drive capability.
It guarantees high-impedance output states during power sequencing (VCC < 2.1 V), and requires external pull-up on OE inputs above 2.1 V to ensure reliable 3-state behavior. Unused pins must be held static (high or low) per JEDEC guidelines to prevent floating-node instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and ensures stable operation across industrial voltage tolerances. |
| Output Drive | –32 mA IOH, +64 mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Propagation Delay | 1 ns (min) to 5.3 ns (max) - supports high-speed bus handshaking in real-time control and data acquisition systems. |
| Input Clamp Current | –18 mA - protects against negative transient voltages at control inputs, enhancing robustness in noisy environments. |
| Thermal Resistance | θJA = 67°C/W (NT package) - defines maximum junction temperature rise under continuous load, critical for thermal margin analysis. |
| ESD Rating | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 requirements, reducing need for external ESD protection in board-level design. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and extended-temperature industrial applications including motor control and instrumentation. |
Pinout & Package
SN74ABT861NT uses a 24-pin plastic DIP (NT) package with through-hole mounting and 0.6-inch body width. Pin spacing follows standard 0.1-inch grid; leads are tin-lead (NIPDAU finish per TI documentation) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 23 | OEBA | Active-low enable for B-to-A data flow; when low, B-bus data appears on A-bus outputs. |
| 10, 13 | OEAB | Active-low enable for A-to-B data flow; when low, A-bus data appears on B-bus outputs. |
| 2–11 | A1–A10 | Input/output port for A-side bus; bidirectional with direction controlled by OEAB/OEBA logic. |
| 14–22, 24 | B1–B10 | Input/output port for B-side bus; mirrors A-port functionality with independent enable control. |
| 12 | GND | Power ground reference for all internal circuitry and I/O structures. |
| 24 | VCC | Positive supply input (4.5–5.5 V); powers BiCMOS core and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Independent Dual Enable Control | Separate OEAB and OEBA inputs allow asymmetric bus arbitration-e.g., A→B active while B→A disabled-enabling flexible memory-mapped I/O or DMA channel isolation. |
| Power-Up/Down High-Z Guarantee | Outputs enter high-impedance state automatically when VCC is below 2.1 V, preventing bus contention during system reset or hot-swap events. |
| High-Drive Outputs | –32 mA / +64 mA drive strength supports direct interfacing with legacy TTL loads and reduces fanout limitations in backplane designs. |
| Latch Mode (OEAB = OEBA = L) | Simultaneously latches A and B bus values, enabling transparent bidirectional data capture without external registers-useful in test-mode diagnostics and boundary-scan emulation. |
| EPIC-IIB BiCMOS Process | Combines bipolar speed and CMOS low static power, achieving sub-5 ns propagation delay with ICC < 38 mA at full load-ideal for power-sensitive industrial controllers. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing a modern microcontroller unit (MCU) to an older 10-bit parallel bus in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus buffering transceiver managing timing-critical read/write cycles between mismatched clock domains. Use Value: Eliminates need for discrete logic or FPGA glue logic by providing deterministic 3-state control and latch mode for synchronized data capture. |
Use Scenario: Extending a CPU local bus to add peripheral modules (e.g., ADCs, DACs, GPIO expanders) in test equipment chassis. IC Role / Device Role / Timing Role: Asynchronous bus repeater with configurable directionality and isolation, supporting hot-plug-safe module insertion. Use Value: Prevents bus contention during module insertion/removal via guaranteed high-Z state at power-up and independent OE control per bus segment. |
| Real-Time Data Acquisition Hub | Embedded Diagnostic Subsystem |
|
Use Scenario: Aggregating sensor data from multiple 10-bit parallel ADCs into a central DSP or FPGA processing node. IC Role / Device Role / Timing Role: Time-multiplexed data concentrator using OEAB/OEBA toggling to sequentially sample each ADC channel onto shared data lines. Use Value: Enables single-chip multiplexing without external address decoders or timing sequencers-reducing PCB area and component count. |
Use Scenario: Implementing in-system diagnostic monitoring of internal bus signals during firmware update or factory calibration sequences. IC Role / Device Role / Timing Role: Transparent bus snooper that latches live A/B bus values (via L/L mode) for offline analysis without disrupting main system operation. Use Value: Provides hardware-level visibility into bus transactions without requiring JTAG or debug probe infrastructure-critical for safety-certified systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT821N | 8-bit configuration, identical EPIC-IIB process, same NT package and pinout compatibility for reduced-width buses. | Limited to 8-bit data paths; unsuitable where full 10-bit width is required for legacy interface compliance. | Select when bus width is constrained to 8 bits and footprint reuse is prioritized over channel count. |
| SN74LVC861PWR | 3.3-V only operation (1.65–3.6 V), lower drive (–24/+24 mA), LVCMOS-compatible I/O, TSSOP-24 package. | Not interoperable with 5-V systems; requires level translation if interfacing with SN74ABT861NT-based buses. | Choose for new low-voltage designs where power efficiency and smaller footprint outweigh 5-V compatibility needs. |
Compared with SN74ABT861NT, SN74ABT821N offers pin-compatible downsizing for 8-bit use cases but sacrifices two data lanes, while SN74LVC861PWR enables modern low-voltage integration at the cost of voltage domain isolation and reduced drive strength-making SN74ABT861NT the sole option for robust 5-V, 10-bit, high-drive industrial bus bridging.
Availability
SN74ABT861NT is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term obsolescence management, and through-hole manufacturing compatibility.
Supply support for SN74ABT861NT 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 connectivity technologies, with decades of heritage in logic and interface IC development.
The ABT logic family-including SN74ABT861NT-is engineered for high-speed, high-drive 5-V bus interfacing in industrial, military, and telecom infrastructure where reliability, noise immunity, and timing predictability are critical.
FAQ
What is the recommended pull-up resistor value for OEAB and OEBA on SN74ABT861NT?
The minimum pull-up resistor value for OEAB and OEBA on SN74ABT861NT is determined by the current-sinking capability of the driving source. TI specifies that OE should be tied to VCC through a pullup resistor when VCC > 2.1 V to guarantee high-impedance output behavior. For standard 5-V operation with typical driver sink current ≤ 100 µA, a 10-kΩ resistor is commonly used. Always verify against actual driver specs in your system, as SN74ABT861NT itself does not define a fixed resistor value.
Does SN74ABT861NT support hot-swap operation?
Yes, SN74ABT861NT supports controlled hot-swap operation due to its guaranteed high-impedance state when VCC is between 0 V and 2.1 V. This prevents bus contention during power ramp-up or partial insertion. However, full hot-swap robustness also depends on system-level design-including current-limiting on VCC, slew-rate control on control signals, and proper sequencing of OEAB/OEBA. The SN74ABT861NT datasheet confirms this behavior but does not guarantee fault tolerance beyond the specified absolute maximum ratings.
Can SN74ABT861NT operate with mixed-voltage interfaces (e.g., 5-V A bus and 3.3-V B bus)?
No, SN74ABT861NT is a single-supply 5-V device (VCC = 4.5–5.5 V) and does not support mixed-voltage I/O. Its A and B ports share the same VCC rail and have TTL-compatible thresholds (VIL = 0.8 V, VIH = 2.0 V), making it incompatible with 3.3-V logic levels without external level-shifting circuitry. Using SN74ABT861NT directly between 5-V and 3.3-V buses risks violating input voltage limits and may damage connected devices.
What is the maximum capacitive load SN74ABT861NT can drive reliably?
SN74ABT861NT is characterized for CL = 50 pF in switching specifications, with propagation delays measured under that condition. While its ±64-mA output drive suggests capability beyond 50 pF, signal integrity degrades with increasing load due to RC time constants. For reliable operation at full speed (≤5.3 ns tPHL), keep total trace + load capacitance ≤ 50 pF. At higher loads, timing margins shrink and overshoot/ringing increase-requiring careful layout or series termination. The SN74ABT861NT datasheet does not specify a hard maximum CL limit beyond this test condition.
Is SN74ABT861NT pin-compatible with SN74ABT861DW?
Yes, SN74ABT861NT and SN74ABT861DW share identical pin functions and numbering for all 24 terminals, including OEAB, OEBA, A1–A10, B1–B10, VCC, and GND. Both follow the same top-view pinout diagram shown in the SCBS199C datasheet. However, their packages differ-NT is plastic DIP, DW is SOIC-and thermal, mechanical, and soldering requirements are not interchangeable. Electrical behavior is identical, but PCB layout and assembly processes must match the selected package.
SN74ABT861NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABT861NT FAQ
1.How can I place an order for SN74ABT861NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT861NT 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 SN74ABT861NT reliable?
The price and inventory of SN74ABT861NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT861NT is usually 5 days.
3.What payment methods are accepted for SN74ABT861NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT861NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT861NT?
SN74ABT861NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT861NT 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 SN74ABT861NT?
For technical support, including SN74ABT861NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT861NT requirements.
6.How does Aetrix verify that SN74ABT861NT is sourced from the original manufacturer or authorized distributors?
All SN74ABT861NT 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 SN74ABT861NT meets industry standards.
7.What is the process for return or replacement of SN74ABT861NT?
All SN74ABT861NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT861NT, 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 SN74ABT861NT part is unused and in its original packaging.
Return procedure for SN74ABT861NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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