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Texas Instruments SN74CBT3861DBQRG4
- Part No.:
- SN74CBT3861DBQRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3861DBQRG4.pdf
- Description:
- IC BUS SW 10 X 1:1 24SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,680
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Product details
Overview
SN74CBT3861DBQRG4 from Texas Instruments is a 10-bit FET bus switch IC with 5 Ω typical on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation across –40°C to 85°C. It enables bidirectional signal routing between two logic ports (A1–A10 ↔ B1–B10) under single OE control, used in high-speed data path isolation for industrial backplanes and memory expansion interfaces.
For engineers reviewing the SN74CBT3861DBQRG4 datasheet, SN74CBT3861DBQRG4 pinout, SN74CBT3861DBQRG4 application, or SN74CBT3861DBQRG4 equivalent, key selection criteria include guaranteed 5 Ω ron at 30 mA, sub-1 ns propagation delay (tpd = 0.25 ns @ VCC = 5 V), 5 pF off-state capacitance (Cio(OFF)), and SSOP-24 package compatibility with space-constrained PCB layouts.
Technical Context
This device implements a single-pole, 10-throw analog switch architecture using NMOS pass transistors with integrated level-shifting circuitry to ensure TTL-compatible input thresholds. Its OE-controlled switching operates without internal latching or direction logic - state is purely combinatorial: OE = L connects A↔B; OE = H isolates both ports into high-Z.
Designed for hot-swap and live-insertion applications, it features latch-up immunity exceeding 250 mA per JESD 17, absolute maximum VI/VO range of –0.5 V to 7 V, and low ICC (3 µA max) enabling use in low-power system management buses. No internal ESD protection diodes are present beyond standard process-level structures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, II = 30 mA - ensures minimal voltage drop (<150 mV) and signal integrity for 3.3 V/5 V logic levels |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V - supports >1 GHz data rates in point-to-point digital interconnects |
| Off-state capacitance (Cio(OFF)) | 5 pF max at VO = 3 V - limits crosstalk and loading on adjacent high-speed traces |
| Supply voltage (VCC) | 4 V to 5.5 V - compatible with standard 5 V TTL and mixed-voltage 3.3 V/5 V system domains |
| Control input thresholds | VIH = 2 V min, VIL = 0.8 V max - directly interfaces unbuffered TTL outputs without level shifters |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| ESD rating | HBM ±2 kV - meets basic handling robustness requirements for automated assembly lines |
Pinout & Package
SN74CBT3861DBQRG4 is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.9 mm × 4.5 mm body size, and 1.2 mm max height. The package is RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow), and features exposed metal-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | NC | No internal connection - must remain unconnected; no pull-up/down or routing required |
| 2–11 | A1–A10 | Input/output port A - bidirectional signal terminals connected through low-rON FETs to corresponding B pins |
| 12 | GND | Ground reference - primary return path for switch current and control logic; requires low-inductance local decoupling |
| 13 | VCC | Power supply - supplies bias for internal level shifters and pass transistors; bypass with 0.1 µF ceramic near pin |
| 14 | OE | Output-enable control - active-low logic input; drives internal gate bias to turn all 10 switches ON (OE = L) or OFF (OE = H) |
| 15–23 | B1–B10 | Input/output port B - mirror counterparts to A1–A10; electrically identical and interchangeable in layout |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bidirectional bus switch | Single OE controls all ten channels simultaneously - eliminates timing skew between lanes in parallel data paths |
| 5 Ω typical on-resistance | Enables <100 mV voltage drop at 20 mA per channel - preserves logic high/low margins in 5 V systems |
| TTL-compatible control interface | Accepts standard 5 V TTL output levels directly - removes need for external level translators or resistive biasing |
| Sub-1 ns propagation delay | Supports clean edge transmission up to 1 GHz - suitable for high-speed address/data multiplexing in microcontroller peripherals |
| Latch-up immunity >250 mA | Withstands transient overcurrent events during hot-plug insertion - critical for modular backplane and docking station designs |
Applications
| Memory Expansion Interface | Industrial Backplane Isolation |
|---|---|
Use Scenario: Adding external SRAM or Flash memory to a microcontroller with limited address/data bus pins. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed sharing of address/data lines between internal and external memory banks. Use Value: Eliminates need for discrete logic gates or complex CPLD-based bus arbiters while maintaining full 5 V logic compatibility and sub-nanosecond timing alignment. |
Use Scenario: Isolating legacy ISA or PCI-like parallel control buses between hot-swappable module slots and main controller. IC Role / Device Role / Timing Role: Signal path gate controlled by FPGA-managed OE to prevent bus contention during module insertion/removal. Use Value: Prevents signal corruption and power rail disturbance during live insertion; 5 Ω ron ensures minimal skew across all 10 control lines. |
| Microcontroller Peripheral Multiplexing | Test Access Port (TAP) Signal Routing |
Use Scenario: Sharing UART, SPI, or GPIO pins between multiple peripherals (e.g., display driver and sensor interface) on resource-constrained MCUs. IC Role / Device Role / Timing Role: Low-latency analog switch enabling software-selectable peripheral connectivity without clock domain crossing. Use Value: Reduces PCB layer count vs. mux-based solutions; 0.25 ns tpd avoids setup/hold violations in 50 MHz SPI clock domains. |
Use Scenario: Dynamically routing JTAG TCK/TMS/TDI/TDO signals between multiple ASICs or FPGAs on a shared test bus. IC Role / Device Role / Timing Role: OE-gated signal bridge allowing one TAP controller to access individual devices without physical rework. Use Value: Enables production test automation with zero hardware change; 5 pF Cio(OFF) prevents capacitive loading that would degrade TCK rise/fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DBQR | 10-bit, dual-supply (VCCA = 1.65–3.6 V, VCCB = 2.3–5.5 V), 6 Ω ron, 3-state outputs | Supports level translation between 3.3 V and 5 V domains; not TTL-input compatible | Select when interfacing mixed-voltage logic families; avoid if only 5 V TTL control is available |
| 74LVC1G3157DCUR | Single-channel SPDT analog switch, 10 Ω ron, 1.65–5.5 V supply, smaller SOT-23-6 package | Requires 10 discrete units for full 10-bit function; higher board area and routing complexity | Choose only for ultra-low-volume prototyping where density is secondary to part commonality |
Compared with SN74CBT3861DBQRG4, SN74CBTD3384DBQR adds voltage translation but increases design complexity with dual supplies, while 74LVC1G3157DCUR sacrifices integration and timing performance for footprint reduction - neither offers pin-compatible replacement.
Availability
SN74CBT3861DBQRG4 is available at Aetrix Electronics and suitable for industrial backplane isolation, microcontroller peripheral multiplexing, and memory expansion interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CBT3861DBQRG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and silicon innovation for industrial, automotive, and communications markets.
The SN74CBT family delivers high-speed, low-rON bus switches optimized for signal integrity in 5 V logic systems - designed specifically for applications demanding nanosecond timing, TTL compatibility, and robust hot-swap operation.
FAQ
What is the maximum continuous current per channel for SN74CBT3861DBQRG4?
The SN74CBT3861DBQRG4 supports a continuous channel current of 128 mA per switch, verified under recommended operating conditions (VCC = 4–5.5 V, TA = –40°C to 85°C). This rating applies to steady-state DC conduction; pulsed operation may allow brief excursions beyond this limit, but thermal derating must be applied based on θJA = 61°C/W for the DBQ package.
Does SN74CBT3861DBQRG4 support level shifting between different logic voltages?
No, SN74CBT3861DBQRG4 does not perform level shifting. It operates from a single VCC supply (4–5.5 V) and passes signals bidirectionally between A and B ports with minimal attenuation. Input thresholds are fixed for TTL compatibility (VIH ≥ 2 V, VIL ≤ 0.8 V), so it cannot translate 3.3 V logic to 5 V domains or vice versa without external biasing.
Can SN74CBT3861DBQRG4 be used in hot-swap applications?
Yes, SN74CBT3861DBQRG4 is explicitly qualified for hot-swap use: its latch-up performance exceeds 250 mA per JESD 17, and it features robust absolute maximum ratings (VI/VO = –0.5 V to 7 V). When combined with series current-limiting resistors and proper OE sequencing, it safely isolates live backplane segments during module insertion.
What is the off-state capacitance of SN74CBT3861DBQRG4 and why does it matter?
The off-state capacitance (Cio(OFF)) of SN74CBT3861DBQRG4 is 5 pF maximum at VO = 3 V or 0 V. This low value minimizes capacitive loading on adjacent high-speed traces, reducing crosstalk and preserving signal edge rates - critical when routing multiple parallel data lines on dense PCBs or in RF-adjacent environments.
Is SN74CBT3861DBQRG4 pin-compatible with other packages in the same family?
No, SN74CBT3861DBQRG4 (SSOP-24) is not pin-compatible with SN74CBT3861DW (SOIC-24) or SN74CBT3861PWR (TSSOP-24), despite identical pin functions. Pin 1 location, pad pitch (0.65 mm vs. 1.27 mm), and body dimensions differ significantly - PCB layout and stencil design must be package-specific. Always verify land pattern against TI's PW0024A or DBQ0024A outlines.
SN74CBT3861DBQRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
SN74CBT3861DBQRG4 FAQ
1.How can I place an order for SN74CBT3861DBQRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3861DBQRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74CBT3861DBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3861DBQRG4 is usually 5 days.
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5.How can I obtain technical support or documentation for SN74CBT3861DBQRG4?
For technical support, including SN74CBT3861DBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3861DBQRG4 requirements.
6.How does Aetrix verify that SN74CBT3861DBQRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3861DBQRG4 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 SN74CBT3861DBQRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3861DBQRG4?
All SN74CBT3861DBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3861DBQRG4, 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 SN74CBT3861DBQRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3861DBQRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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