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Texas Instruments SN74CBT3861DW
- Part No.:
- SN74CBT3861DW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT3861DW.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,218
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Product details
Overview
SN74CBT3861DW from Texas Instruments is a 10-bit FET bus switch IC with 5-Ω on-state resistance, TTL-compatible control inputs, and single OE-enabled bidirectional switching between A and B ports. It operates from 4 V to 5.5 V across –40°C to 85°C and delivers sub-nanosecond propagation delay (0.25 ns at 5 V) for high-speed data path isolation in digital systems.
For engineers reviewing the SN74CBT3861DW datasheet, SN74CBT3861DW pinout, SN74CBT3861DW application, or SN74CBT3861DW equivalent, key selection criteria include its low on-resistance, rail-to-rail signal handling, latch-up immunity (>250 mA), and SOIC-24 package compatibility with legacy board layouts requiring minimal layout change.
Technical Context
This device implements ten independent NMOS transmission gates controlled by a single active-low output-enable (OE) input. When OE is low, all ten A–B paths conduct with near-zero charge injection and minimal capacitive loading (Cio(OFF) = 5 pF). The architecture avoids internal latching or level-shifting-signals pass through unaltered in voltage range (–0.5 V to 7 V).
It uses standard CMOS process technology with ESD protection and meets JESD 17 latch-up specification. No internal pull-ups or pull-downs exist on A/B ports; all I/Os are fully floating when disabled, supporting hot-swap and bus-isolation use cases without signal contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V - enables low-loss signal routing with <10 mV drop at 20 mA per channel |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V - supports >1 GHz data rate in short trace applications |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage system backplanes |
| Input voltage range (VI) | –0.5 V to 7 V - allows safe interfacing with overvoltage-tolerant or undershoot-prone buses |
| Off-state capacitance (Cio) | 5 pF max - minimizes crosstalk and loading on adjacent high-speed traces |
| Latch-up immunity | >250 mA per JESD 17 - ensures robust operation in noisy industrial environments |
| Operating temperature | –40°C to +85°C - qualified for extended commercial and industrial ambient conditions |
Pinout & Package
SN74CBT3861DW is housed in a 24-pin SOIC (DW) package with 0.65 mm lead pitch, 7.5 mm body width, and 1.2 mm max height. Thermal resistance θJA is 46°C/W, enabling operation at full rating without forced airflow in standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | NC | No internal connection - must remain unconnected; no pull-up/down or bypass required |
| 2–11 | A1–A10 | Input/output port A - bidirectional signal terminals tied directly to switch FET sources |
| 12 | GND | Ground reference - primary return path for all switch current and control logic |
| 13 | VCC | Power supply - supplies both control logic and switch conduction path; decoupling required within 1 cm |
| 14 | OE | Active-low output enable - drives all ten switches simultaneously; TTL-compatible threshold (VIL ≤ 0.8 V) |
| 15–23 | B1–B10 | Input/output port B - bidirectional signal terminals tied directly to switch FET drains |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bidirectional bus switch | Single OE controls all ten channels - simplifies timing-critical enable sequencing in memory/data bus isolation |
| 5-Ω typical on-resistance | Enables <1% signal attenuation at 20 mA - preserves logic margins in 5-V TTL and LVTTL systems |
| TTL-compatible control inputs | Accepts standard 0.8 V/2.0 V thresholds - eliminates need for level translators when driven by legacy logic |
| High off-isolation (5 pF Cio) | Reduces capacitive coupling between enabled and disabled buses - critical for multi-drop or shared-bus architectures |
| Rail-to-rail signal swing support | Handles –0.5 V to 7 V signals - accommodates ground bounce, overshoot, and mixed-supply interfaces |
Applications
| PCI Bus Isolation | Memory Address Multiplexing |
|---|---|
Use Scenario: Isolating PCI add-in card signals from motherboard during hot-plug insertion to prevent bus contention. IC Role / Device Role / Timing Role: Bidirectional signal gate controlled by system-side OE to break continuity before card power-up. Use Value: Prevents data corruption and supply rail collapse using <0.25 ns delay and 5-Ω RON to maintain signal integrity during transition. |
Use Scenario: Sharing address lines between two memory banks with staggered access timing in embedded microcontrollers. IC Role / Device Role / Timing Role: Time-multiplexed address path selector enabling dual-bank addressing without additional decode logic. Use Value: Eliminates need for tristate buffers or CPLD-based routing; 5 pF off-capacitance prevents address skew between banks. |
| Test Equipment Signal Routing | Legacy System Bus Expansion |
Use Scenario: Reconfigurable signal path switching inside automated test equipment for DUT interface adaptation. IC Role / Device Role / Timing Role: Low-latency, low-distortion analog/digital signal path selector under microcontroller control. Use Value: Sub-ns tpd and rail-to-rail voltage support allow accurate timing alignment across multiple instrument channels. |
Use Scenario: Adding peripheral modules to aging industrial controllers using original 5-V bus architecture. IC Role / Device Role / Timing Role: Backward-compatible bus extender that matches legacy timing and drive strength requirements. Use Value: TTL-compatible VIH/VIL and 5-Ω RON ensure drop-in replacement without redesign of upstream drivers or receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DW | 10-bit switch with 3.3-V-only supply (3.0–3.6 V); higher RON (7 Ω typ); includes power-down mode | Requires 3.3-V rail and level translation for 5-V systems; better suited for low-power portable designs | Select only if migrating to 3.3-V infrastructure; not pin-compatible due to different VCC and OE voltage ranges |
| 74LVC1G3157DBVR | Single-pole double-throw analog switch; 5-V tolerant; 10 Ω RON; SC70-6 package | Provides 1-channel switching in ultra-small footprint; lacks multi-bit synchronization via shared OE | Use for point-to-point signal routing where density matters more than parallel bus control; requires 10x devices for full 10-bit function |
Compared with SN74CBT3861DW, SN74CBTD3384DW trades 5-V compatibility for lower power and added shutdown control, while 74LVC1G3157DBVR offers miniaturization at the cost of scalability and synchronized enable timing-neither is pin-compatible, and both require PCB redesign for direct substitution.
Availability
SN74CBT3861DW is available at Aetrix Electronics and suitable for PCI bus isolation, memory address multiplexing, test equipment signal routing, and legacy system bus expansion requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT3861DW 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, delivering analog, embedded processing, and connectivity solutions since 1930.
The SN74CBT3861DW belongs to TI's CBT (Crossbar Bus Technology) family, engineered specifically for high-speed, low-distortion digital bus switching in 5-V systems where minimal propagation delay and precise signal fidelity are critical.
FAQ
What is the maximum continuous current per channel for SN74CBT3861DW?
The SN74CBT3861DW supports up to 128 mA continuous channel current per A–B path, as specified in absolute maximum ratings. This rating applies under recommended operating conditions with proper PCB thermal design; derating is required above 70°C ambient. The device maintains 5 Ω on-resistance across this range, ensuring predictable voltage drop and thermal performance in SN74CBT3861DW implementations.
Does SN74CBT3861DW support hot-swap operation?
Yes, SN74CBT3861DW supports hot-swap operation due to its rail-to-rail input voltage tolerance (–0.5 V to 7 V), high off-isolation (5 pF), and absence of internal bias networks on A/B ports. When OE is high, ports float in true high-impedance state-no leakage path exists to VCC or GND. This behavior is confirmed in the functional table and absolute maximum ratings section of the SN74CBT3861DW datasheet.
Can SN74CBT3861DW be used with 3.3-V logic levels?
SN74CBT3861DW is designed for 5-V operation (4 V to 5.5 V supply) and features TTL-compatible control inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), making it compatible with 3.3-V CMOS outputs driving OE-provided those outputs meet the 2.0 V VIH minimum. However, A/B signal paths retain full 5-V swing capability; using 3.3-V signals does not damage the SN74CBT3861DW but may reduce noise margin.
What is the thermal resistance (θJA) of SN74CBT3861DW in its SOIC package?
The SN74CBT3861DW in the DW (SOIC-24) package has a junction-to-ambient thermal resistance (θJA) of 46°C/W, measured per JESD 51-7 on a standard 2S2P test board. This value assumes 1-inch² copper area on top and bottom layers with thermal vias; actual board layout will affect real-world thermal performance. The SN74CBT3861DW can sustain full 128 mA per channel at 25°C ambient with this thermal design.
Is there a pin-compatible 3.3-V replacement for SN74CBT3861DW?
No, there is no pin-compatible 3.3-V replacement for SN74CBT3861DW. The SN74CBTD3384DW shares the same pinout but requires 3.0–3.6 V supply and has different input voltage thresholds-making it incompatible with 5-V OE control. Other alternatives like 74LVC1G3157DBVR differ in channel count, package, and enable architecture. Any migration from SN74CBT3861DW to 3.3-V operation requires board-level redesign.
SN74CBT3861DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74CBT3861DW FAQ
1.How can I place an order for SN74CBT3861DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3861DW 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 SN74CBT3861DW reliable?
The price and inventory of SN74CBT3861DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3861DW is usually 5 days.
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SN74CBT3861DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3861DW 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 SN74CBT3861DW?
For technical support, including SN74CBT3861DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3861DW requirements.
6.How does Aetrix verify that SN74CBT3861DW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3861DW 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 SN74CBT3861DW meets industry standards.
7.What is the process for return or replacement of SN74CBT3861DW?
All SN74CBT3861DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3861DW, 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 SN74CBT3861DW part is unused and in its original packaging.
Return procedure for SN74CBT3861DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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