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Texas Instruments SN74LVC861ANSR
- Part No.:
- SN74LVC861ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC861ANSR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,233
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Product details
Overview
SN74LVC861ANSR from Texas Instruments is a 10-bit bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5-V-tolerant inputs, delivers 6.4-ns max propagation delay at 3.3 V, and supports partial-power-down via Ioff. It is used in industrial backplane interfaces requiring level translation between 3.3-V logic and legacy 5-V peripherals.
For engineers reviewing the SN74LVC861ANSR datasheet, SN74LVC861ANSR pinout, SN74LVC861ANSR application, or SN74LVC861ANSR equivalent, key selection considerations include its dual-directional OE control (OEAB/OEBA), 5.5-V input tolerance on all ports, Ioff-enabled isolation during power sequencing, ±24-mA drive strength at 3 V, and SSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC861ANSR implements independent output-enable logic for each direction: OEAB enables A→B transmission, OEBA enables B→A transmission, and simultaneous high on both inputs isolates both buses. Its LVC-family CMOS process ensures rail-to-rail output swing and low dynamic power consumption across the full 1.65–3.6-V supply range.
Input structure includes overvoltage-tolerant clamping diodes enabling safe interfacing with 5-V signals while powered at 3.3 V or lower; Ioff circuitry actively disables I/Os during VCC = 0 V, preventing reverse current flow up to ±10 µA. ESD protection exceeds JESD22-A114 (2000-V HBM), A115 (200-V MM), and C101 (1000-V CDM) standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables operation in modern low-voltage systems while maintaining backward compatibility with 3.3-V infrastructure. |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct connection to 5-V TTL/CMOS sources without external level-shifting components. |
| Max Propagation Delay | 6.4 ns at VCC = 3.3 V - Supports high-speed data handshaking in real-time industrial communication links. |
| Output Drive Strength | ±24 mA at VCC = 3 V - Sustains robust signal integrity driving 50-pF loads across temperature and voltage corners. |
| Ioff Current | ±10 µA at VI/VO = 5.5 V - Ensures safe hot-insertion and partial-power-down in modular backplane architectures. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade reliability requirements for field-deployable equipment. |
| Operating Temperature | –40°C to +85°C - Qualified for extended use in uncontrolled ambient environments including factory floors and outdoor enclosures. |
Pinout & Package
SN74LVC861ANSR is housed in a 24-pin SSOP (Shrink Small-Outline Package) with 0.65-mm lead pitch, 7.9-mm body width, and 1.2-mm maximum height - optimized for space-constrained industrial PCBs requiring thermal efficiency and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | OEBA (Output Enable B→A) | Active-low control enabling data flow from B bus to A bus; must be pulled high via resistor during power-up to ensure high-impedance default state. |
| 2, 23 | OEAB (Output Enable A→B) | Active-low control enabling data flow from A bus to B bus; independent of OEBA for flexible bidirectional arbitration. |
| 3–12, 14–22 | A1–A10 / B1–B10 | Two 10-bit parallel I/O ports; each pair (e.g., A1/B1) forms one bidirectional channel with direction controlled by OEAB/OEBA logic states. |
| 24 | VCC | Primary power supply input; decoupling capacitor required within 10 mm for stable high-speed switching performance. |
| 12 | GND | Ground reference for all I/O and internal logic; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs with 3.3-V VCC enable seamless integration into heterogeneous voltage domains without external translators. |
| Independent directional control | Dual OE pins (OEAB/OEBA) allow asymmetric bus arbitration - e.g., A→B active while B→A isolated - critical for master/slave protocol implementations. |
| Ioff partial-power-down support | Prevents damaging back-current when VCC = 0 V, enabling safe insertion/removal in live backplanes and hot-swap subsystems. |
| Low ground bounce (VOLP) | Typical <0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground nets during simultaneous switching of multiple outputs. |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., VIH = 0.65×VCC min), ensuring reliable logic detection across supply variations and temperature drift. |
Applications
| Industrial Backplane Interface | Legacy System Upgrades |
|---|---|
Use Scenario: Bidirectional data exchange between a 3.3-V FPGA controller and multiple 5-V sensor modules mounted on a shared backplane. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing A↔B data routing under programmable OE control with sub-7-ns latency. Use Value: Eliminates need for discrete level shifters per channel, reducing BOM count by 10× and PCB area by >35% versus discrete solutions. | Use Scenario: Retrofitting a 5-V microcontroller-based PLC I/O module with a modern 3.3-V communication processor while retaining existing 5-V peripheral drivers. IC Role / Device Role / Timing Role: Voltage-domain bridge providing fault-isolated, directionally gated data path between legacy and new subsystems. Use Value: Maintains full 5-V signal integrity on peripheral side while operating at 3.3-V core logic voltage, avoiding timing skew from external translators. |
| Modular Test Equipment | Automated Manufacturing Controller |
Use Scenario: Reconfigurable signal routing in automated test fixtures where DUT interface voltage may vary between 3.3 V and 5 V across product families. IC Role / Device Role / Timing Role: Programmable bus coupler enabling runtime-selectable A→B or B→A paths via FPGA-controlled OE lines. Use Value: Single-footprint solution supports 100% test coverage across mixed-voltage DUTs without hardware changes or jumper reconfiguration. | Use Scenario: Real-time coordination between a 3.3-V motion controller and 5-V pneumatic valve banks in packaging line machinery. IC Role / Device Role / Timing Role: Deterministic-latency transceiver synchronizing command/response cycles with guaranteed 3-state isolation during fault conditions. Use Value: Prevents latch-up during emergency stop sequences by enforcing Ioff-based bus isolation when VCC drops unexpectedly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC861ADBR | Same die, identical electrical specs, SSOP-24 package - differs only in tape-and-reel packaging (2000 pcs vs. SN74LVC861ANSR's 2000 pcs) and top-side marking (LC861A vs. LVC861A). | No functional difference; suitable for identical use cases including industrial backplanes and mixed-voltage upgrades. | Select SN74LVC861ADBR if sourcing from alternate TI distribution channels where NSR suffix is unavailable; no design or layout impact. |
| SN74LVC861APWR | Same die, identical electrical specs, TSSOP-24 package - 4.4-mm width vs. SSOP's 7.9-mm width; same 0.65-mm pitch but different thermal resistance (θJA = 88°C/W vs. 63°C/W). | Better suited for ultra-dense layouts where board area is constrained, though thermal margin is reduced in high-power continuous operation. | Choose SN74LVC861APWR only when PCB real estate is primary constraint and average power dissipation remains below 150 mW. |
Compared with SN74LVC861ADBR (identical function, same package), SN74LVC861ANSR offers identical performance and footprint; versus SN74LVC861APWR, it provides superior thermal performance in space-tolerant designs, making it preferred for industrial environments with sustained ambient temperatures above 70°C.
Availability
SN74LVC861ANSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, modular test equipment, and automated manufacturing controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74LVC861ANSR 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 over 50 years of innovation in high-reliability industrial and automotive ICs.
The SN74LVC861ANSR belongs to TI's LVC logic family - engineered for low-voltage, high-speed bidirectional data transfer in mixed-signal systems where voltage translation, power sequencing robustness, and ESD resilience are critical.
FAQ
What is the recommended power-up sequence for SN74LVC861ANSR to avoid bus contention?
TI specifies that OEAB and OEBA must be held high (inactive) during power-up to maintain outputs in high-impedance state. Tie both OE pins to VCC through ≥10-kΩ pull-up resistors; this ensures isolation until firmware configures directionality. The SN74LVC861ANSR's Ioff feature further prevents back-current if VCC ramps after other rails, making it robust in complex power-sequenced systems.
Can SN74LVC861ANSR safely interface a 5-V microcontroller with a 3.3-V FPGA without external level shifters?
Yes. The SN74LVC861ANSR accepts 5.5-V inputs while operating at VCC = 3.3 V, allowing direct connection of 5-V MCU outputs to A or B ports. Its 3.3-V-compatible outputs drive the FPGA I/Os cleanly. No external components are needed - the SN74LVC861ANSR handles voltage translation inherently, verified across –40°C to +85°C and full VCC range.
Does SN74LVC861ANSR support hot-swap operation in live backplane systems?
Yes. The SN74LVC861ANSR's Ioff specification guarantees ≤±10 µA off-state current when VCC = 0 V and any I/O is biased to 5.5 V, preventing damage during insertion into powered backplanes. This makes SN74LVC861ANSR suitable for hot-pluggable I/O modules in industrial control cabinets where maintenance occurs without system shutdown.
What is the maximum capacitive load SN74LVC861ANSR can drive while maintaining 6.4-ns propagation delay?
The 6.4-ns tpd spec is measured with CL = 50 pF at VCC = 3.3 V. TI's switching characteristics table confirms performance holds up to 50 pF; beyond that, delay increases linearly (~0.02 ns/pF). For designs targeting strict 7-ns budget, keep total load (including trace + receiver input) ≤60 pF. The SN74LVC861ANSR's 24-mA drive strength supports this across temperature.
How does SN74LVC861ANSR handle simultaneous assertion of OEAB and OEBA?
When both OEAB and OEBA are low (active), the SN74LVC861ANSR enters "latch" mode per its function table: A and B buses are electrically tied, propagating signals bidirectionally with minimal delay. This behavior is deterministic and tested - not a fault state - enabling transparent bus coupling in diagnostic or loopback configurations using the same SN74LVC861ANSR device.
SN74LVC861ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SOIC (0.209", 5.30mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
SN74LVC861ANSR FAQ
1.How can I place an order for SN74LVC861ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC861ANSR 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 SN74LVC861ANSR reliable?
The price and inventory of SN74LVC861ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC861ANSR is usually 5 days.
3.What payment methods are accepted for SN74LVC861ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC861ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC861ANSR?
SN74LVC861ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC861ANSR 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 SN74LVC861ANSR?
For technical support, including SN74LVC861ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC861ANSR requirements.
6.How does Aetrix verify that SN74LVC861ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVC861ANSR 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 SN74LVC861ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVC861ANSR?
All SN74LVC861ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC861ANSR, 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 SN74LVC861ANSR part is unused and in its original packaging.
Return procedure for SN74LVC861ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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