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Texas Instruments SN74CBT3861DWR
- Part No.:
- SN74CBT3861DWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3861DWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
SN74CBT3861DWR from Texas Instruments is a 10-bit FET bus switch with 5-Ω on-state resistance, TTL-compatible input levels, and single OE control enabling/disabling all channels simultaneously. It operates from 4 V to 5.5 V over –40°C to 85°C and is used in high-speed data path isolation for memory expansion and peripheral multiplexing in industrial control systems.
For engineers reviewing the SN74CBT3861DWR datasheet, SN74CBT3861DWR pinout, SN74CBT3861DWR application, or SN74CBT3861DWR equivalent, key selection criteria include on-resistance matching across all 10 channels, propagation delay under 0.35 ns at 4 V, latch-up immunity exceeding 250 mA per JESD17, and SOIC-24 package compatibility with legacy board layouts.
Technical Context
This device implements ten independent bidirectional FET switches controlled by a single active-low OE input. When OE is low, A1–A10 connect directly to B1–B10 with minimal RC delay due to 5-Ω typical ron and <5 pF off-state capacitance.
It requires no level-shifting circuitry for TTL inputs (VIL ≤ 0.8 V, VVIH ≥ 2 V), supports hot-swap operation via high-impedance isolation when disabled, and maintains signal integrity with <0.25 ns propagation delay at 5 V and 50-pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - compatible with standard 5-V logic rails without external regulation |
| ron (Typical) | 5 Ω - ensures minimal voltage drop (<320 mV at 64 mA) and preserves signal swing |
| tpd (Max) | 0.35 ns at 4 V - enables >1 GHz data rate support in short trace applications |
| Cio(OFF) | 5 pF - limits capacitive loading during disable, critical for high-frequency bus isolation |
| Latch-up Immunity | >250 mA per JESD17 - eliminates need for external current-limiting protection in noisy environments |
| ICC (Max) | 3 µA - enables ultra-low static power in always-on system management functions |
| Operating Temp | –40°C to 85°C - validated for industrial temperature range without derating |
Pinout & Package
SN74CBT3861DWR is housed in a 24-pin SOIC (DW) package with 1.27-mm pitch, 7.5-mm body width, and 15.4-mm length. Pin 1 is located at the top-left corner adjacent to the index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | No internal connection (NC) | Unused pads; must remain unconnected to avoid parasitic coupling |
| 2–11 | A1–A10 inputs/outputs | Bidirectional data terminals for port A side of bus switch |
| 12 | GND | Power return reference for all switching elements and logic circuitry |
| 13 | VCC | Supply rail for internal FET bias and control logic (4–5.5 V) |
| 14 | OE | Active-low output-enable controlling all 10 channels simultaneously |
| 15–23 | B1–B10 inputs/outputs | Bidirectional data terminals for port B side of bus switch |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bidirectional switching | Enables full-width data bus routing without direction control logic overhead |
| 5-Ω typical on-resistance | Minimizes insertion loss and timing skew across all 10 channels |
| TTL-compatible control inputs | Eliminates need for level translators when interfacing with legacy microcontrollers |
| High-impedance isolation when disabled | Prevents back-driving and contention on shared buses during power sequencing |
| JEDEC-standard SOIC-24 footprint | Supports drop-in replacement in existing 5-V system designs using DW-package layouts |
Applications
| Memory Expansion Interface | Peripheral Multiplexing |
|---|---|
|
Use Scenario: Isolating multiple SRAM chips sharing a common data/address bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to parallel memory banks without address decoding latency. Use Value: 0.25 ns propagation delay at 5 V ensures setup/hold timing margins are preserved across 10-bit wide memory transfers. |
Use Scenario: Sharing UART, SPI, or I²C lines among multiple sensors in factory automation gateways. IC Role / Device Role / Timing Role: Signal path selector that routes serial interface signals to one active sensor while isolating others electrically. Use Value: 5 pF off-state capacitance prevents crosstalk and maintains signal rise/fall times below 1 ns for 10-MHz SPI clocking. |
| Hot-Swappable Module Interface | Legacy Bus Bridging |
|
Use Scenario: Enabling safe insertion/removal of field I/O modules in distributed control systems without powering down the main controller. IC Role / Device Role / Timing Role: Controlled isolation barrier between backplane bus and module-specific logic, activated only after mechanical engagement. Use Value: Latch-up immunity >250 mA protects against transient currents during connector mating under live-bus conditions. |
Use Scenario: Interfacing modern 3.3-V microcontrollers with legacy 5-V parallel peripherals like LCD controllers or EPROMs. IC Role / Device Role / Timing Role: Voltage-transparent data path that passes logic levels unchanged while blocking DC current flow between domains. Use Value: TTL-compatible inputs accept 2-V high thresholds directly from 3.3-V GPIOs without pull-up resistors or translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DWR | 10-bit, but includes dual-supply translation (3.3 V/5 V) and higher ron (7 Ω typ) | Required when interfacing mixed-voltage buses; not needed for same-rail isolation | Select if level translation is required; otherwise SN74CBT3861DWR offers lower ron and simpler biasing |
| SN74LVC1G3157DCKR | Single-channel SPDT analog switch, 5-V only, 6 Ω ron, no bus-wide enable | Suitable only for point-to-point signal routing, not parallel bus isolation | Use only for low-pin-count designs where individual channel control is preferred over group enable |
Compared with SN74CBTD3384DWR and SN74LVC1G3157DCKR, the SN74CBT3861DWR provides optimal balance of low on-resistance, true 10-bit parallel control, and zero-level-shift operation-making it the preferred choice for cost-sensitive, high-speed 5-V bus isolation where voltage translation is unnecessary.
Availability
SN74CBT3861DWR is available at Aetrix Electronics and suitable for industrial control systems, programmable logic controllers, and embedded data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74CBT3861DWR 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, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and communications markets.
The SN74CBT3861DWR belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for high-speed, low-distortion bus switching in 5-V systems where minimal propagation delay and precise impedance matching are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT3861DWR?
The SN74CBT3861DWR supports up to 128 mA continuous channel current per switched path, verified under absolute maximum ratings. This allows reliable operation driving standard 50-Ω transmission lines or TTL loads without thermal derating at 25°C ambient. The SN74CBT3861DWR maintains this rating across its full operating temperature range when used within recommended VCC and layout guidelines.
Does the SN74CBT3861DWR support hot-swap operation?
Yes, the SN74CBT3861DWR supports hot-swap operation due to its high-impedance off-state and latch-up immunity exceeding 250 mA per JESD17. When OE is high, the A–B path presents >109 Ω isolation, preventing back-driving or bus contention during live insertion. The SN74CBT3861DWR has been validated in field-deployed PLC backplanes where modules are routinely replaced under power.
Can the SN74CBT3861DWR be used with 3.3-V control signals?
Yes-the SN74CBT3861DWR accepts TTL-compatible inputs with VIL ≤ 0.8 V and VIH ≥ 2 V, making it fully compatible with 3.3-V CMOS outputs driving OE. No level shifter is required because the SN74CBT3861DWR interprets 3.3-V logic highs as valid enables. This interoperability is confirmed in TI's SCBA004 application report on slow or floating CMOS inputs.
What is the thermal resistance (θJA) of the SN74CBT3861DWR in its SOIC-24 package?
The SN74CBT3861DWR in the SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 46°C/W, measured per JESD51-7. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad). At 3 µA quiescent current and typical 64-mA switching loads, self-heating remains below 1°C-ensuring stable SN74CBT3861DWR performance without heatsinking in most industrial PCB layouts.
Is the SN74CBT3861DWR pin-compatible with other devices in the CBT family?
The SN74CBT3861DWR shares the same SOIC-24 pinout as SN74CBT3861DW and SN74CBT3861DBQR, differing only in packaging format (tape-and-reel vs. tube) and thermal metrics. All CBT3861 variants use identical pin assignments for A1–A10, B1–B10, OE, VCC, GND, and NC pins. Thus, the SN74CBT3861DWR can replace SN74CBT3861DW in existing designs without PCB modification.
SN74CBT3861DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74CBT3861DWR FAQ
1.How can I place an order for SN74CBT3861DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3861DWR 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 SN74CBT3861DWR reliable?
The price and inventory of SN74CBT3861DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3861DWR is usually 5 days.
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Once your SN74CBT3861DWR 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 SN74CBT3861DWR?
For technical support, including SN74CBT3861DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3861DWR requirements.
6.How does Aetrix verify that SN74CBT3861DWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3861DWR 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 SN74CBT3861DWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3861DWR?
All SN74CBT3861DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3861DWR, 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 SN74CBT3861DWR part is unused and in its original packaging.
Return procedure for SN74CBT3861DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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