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Texas Instruments SN74CBTD3861PWE4
- Part No.:
- SN74CBTD3861PWE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTD3861PWE4.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,668
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Product details
Overview
SN74CBTD3861PWE4 from Texas Instruments is a 10-bit FET bus switch with integrated level-shifting capability, designed for bidirectional signal routing between 5-V and 3.3-V logic domains. It features 5-Ω on-state resistance, TTL-compatible inputs, and single OE control enabling high-speed switching (0.35 ns propagation delay) in memory and data-path applications.
For engineers reviewing the SN74CBTD3861PWE4 datasheet, SN74CBTD3861PWE4 pinout, SN74CBTD3861PWE4 application, or SN74CBTD3861PWE4 equivalent, key selection criteria include verified 5-Ω Ron, guaranteed level-shifting from 5-V inputs to 3.3-V outputs, OE-controlled high-impedance isolation, and TSSOP-24 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
This device implements a single 10-bit bidirectional analog switch using NMOS FETs with integrated VCC-clamp diodes to enable level translation. Its architecture supports simultaneous switching of all ten channels under one active-low OE signal, with no internal latching or direction control logic.
The switch operates within 4.5 V to 5.5 V supply range and maintains low capacitance (4 pF off-state, 2.5 pF control input), minimizing signal integrity degradation in high-frequency data buses. Propagation delay is dominated by RC time constant of Ron and load capacitance, not gate propagation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (Ron) | 5 Ω typical - enables minimal voltage drop and signal distortion across A/B ports at ≤128 mA channel current. |
| Propagation delay (tpd) | 0.35 ns - supports high-speed data transfer without timing bottlenecks in wide-bus systems. |
| Supply voltage (VCC) | 4.5 V to 5.5 V - compatible with standard 5-V logic rails while enabling safe 3.3-V output level shifting. |
| Input voltage range (VI) | –0.5 V to 7 V - accommodates overvoltage transients and mixed-voltage interface conditions. |
| Off-state capacitance (Cio) | 4 pF - reduces crosstalk and loading on adjacent signal lines during isolation mode. |
| Operating temperature | –40°C to 85°C - qualified for industrial-grade embedded and computing applications. |
| Control input thresholds | VIL = 0.8 V, VIH = 2 V - ensures reliable TTL-level compatibility with legacy 5-V controllers. |
Pinout & Package
TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm body height, lead pitch 0.65 mm, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | No-connect (NC) | Internally unconnected - must be left floating or tied to GND per layout best practice; no electrical function. |
| 2–11 | A1–A10 | Input/output port A - bidirectional signal path connected to B-port when OE is low; accepts 5-V logic inputs. |
| 12 | GND | Ground reference - return path for all internal circuitry and substrate bias; requires low-impedance PCB connection. |
| 13 | VCC | Positive supply - powers internal clamp diodes and switch FETs; must be decoupled near pin with 0.1 µF ceramic capacitor. |
| 14 | OE | Active-low output enable - controls all ten switches simultaneously; low = A↔B connected, high = high-Z isolation. |
| 15–23 | B1–B10 | Input/output port B - bidirectional signal path; outputs 3.3-V logic levels when driven from 5-V A-side via integrated diode clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level-shifting diode | Enables direct 5-V-to-3.3-V signal translation without external components, reducing BOM count and board space. |
| Low on-state resistance | 5 Ω typical Ron minimizes insertion loss and preserves signal edge rates in high-speed parallel buses. |
| TTL-compatible control inputs | VIH = 2 V / VIL = 0.8 V allows direct interfacing with legacy 5-V microcontrollers and FPGAs without level translators. |
| High off-isolation | 4 pF Cio(OFF) limits capacitive coupling between ports during disable, critical for noise-sensitive mixed-signal systems. |
| Single OE architecture | One-pin global enable simplifies timing control and reduces FPGA I/O usage compared to per-channel enable schemes. |
Applications
| Memory Subsystem Interfacing | Processor Bus Expansion |
|---|---|
Use Scenario: Connecting a 5-V SRAM or Flash memory to a 3.3-V microcontroller data bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch isolating memory address/data lines during idle cycles and translating logic levels during read/write. Use Value: Eliminates need for discrete level translators and pull-up resistors, reducing component count and ensuring sub-nanosecond timing alignment across all 10 data bits. | Use Scenario: Extending a 32-bit processor local bus to peripheral ASICs operating at different voltage domains. IC Role / Device Role / Timing Role: High-speed, low-latency signal bridge enabling synchronous data exchange between 5-V and 3.3-V subsystems. Use Value: Maintains signal integrity with 0.35 ns tpd and 5 Ω Ron, avoiding timing skew that would otherwise require complex PCB length matching. |
| Legacy Peripheral Integration | Industrial Control Backplane |
Use Scenario: Integrating older 5-V UART, SPI, or parallel I/O peripherals into modern 3.3-V PLC controller designs. IC Role / Device Role / Timing Role: Voltage-domain translator and bus isolator activated only during active communication bursts. Use Value: Provides robust 5-V transient tolerance (–0.5 V to 7 V input range) and eliminates ground-loop noise coupling via high-Z isolation when disabled. | Use Scenario: Signal routing between modular I/O cards in an industrial backplane supporting mixed 3.3-V/5-V modules. IC Role / Device Role / Timing Role: Reconfigurable bus segment switch enabling hot-swap isolation and domain partitioning. Use Value: Delivers –40°C to 85°C operation and MSL-1 reflow compatibility, meeting IPC-A-610 Class 3 requirements for long-life embedded systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3861PWR | Same die, tape-and-reel packaging (2000 pcs), identical electrical specs and pinout. | No functional difference; differs only in packaging format and reel quantity. | Select SN74CBTD3861PWR for automated SMT production requiring large-volume reels. |
| SN74LVC1G3157DCKR | Single-channel SPDT analog switch, 5-V tolerant inputs, 6 Ω Ron, no integrated level-shifting diode. | Limited to 1-bit routing; requires external level-shifting circuitry for 5-V-to-3.3-V translation. | Choose only for low-pin-count designs where per-channel control and smaller footprint outweigh 10-bit integration benefits. |
Compared with SN74CBTD3861PWE4, SN74CBTD3861PWR offers identical performance in tape-and-reel form for volume manufacturing, while SN74LVC1G3157DCKR provides flexibility for single-line routing but lacks native level shifting and scalability to 10-bit buses.
Availability
SN74CBTD3861PWE4 is available at Aetrix Electronics and suitable for memory subsystem interfacing, processor bus expansion, and industrial control backplane applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74CBTD3861PWE4 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBTD3861PWE4 belongs to TI's 74CBT family of high-speed CMOS bus switches, engineered specifically for low-latency, level-shifting interconnect in mixed-voltage digital systems.
FAQ
What is the maximum continuous current rating per channel for the SN74CBTD3861PWE4?
The SN74CBTD3861PWE4 supports a continuous channel current of 128 mA per A/B path. This rating is validated under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to 85°C) and ensures thermal stability without derating in typical PCB layouts with moderate copper area. Exceeding this value risks exceeding junction temperature limits.
Does the SN74CBTD3861PWE4 require external pull-up or pull-down resistors on its A or B ports?
No, the SN74CBTD3861PWE4 does not require external pull-up or pull-down resistors on A or B ports for normal operation. Its CMOS-based FET switch presents high-impedance off-state and rail-to-rail conduction when enabled. However, unused control inputs (e.g., OE) must be tied to VCC or GND per TI application note SCBA004 to prevent floating-node instability.
Can the SN74CBTD3861PWE4 translate signals from 3.3-V to 5-V logic levels?
No, the SN74CBTD3861PWE4 is unidirectionally optimized for 5-V-to-3.3-V level shifting via its integrated VCC-clamp diode. When driven from the B side (3.3-V), the A side reflects the same voltage level without boosting. For bidirectional or 3.3-V-to-5-V translation, a dedicated level translator such as TXB0108 is required.
What is the thermal resistance (θJA) of the SN74CBTD3861PWE4 in its TSSOP-24 package?
The SN74CBTD3861PWE4 in the PW (TSSOP-24) package has a specified junction-to-ambient thermal resistance (θJA) of 88°C/W under JEDEC JESD51-7 standard test conditions. This value assumes a two-layer PCB with 1-in² copper pour per side; actual thermal performance improves with enhanced heatsinking or multilayer board design.
Is the SN74CBTD3861PWE4 pin-compatible with other packages in the same family, such as SN74CBTD3861DBR?
Yes, the SN74CBTD3861PWE4 shares identical pinout and functionality with SN74CBTD3861DBR (SSOP-24), SN74CBTD3861DW (SOIC-24), and SN74CBTD3861DGVR (TVSOP-24). All variants use the same DB/DGV/DW/PW top-view pin assignment: NC, A1–A10, GND, VCC, OE, B1–B10. Mechanical dimensions differ, but PCB layout can be reused with footprint adaptation.
SN74CBTD3861PWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-TSSOP
SN74CBTD3861PWE4 FAQ
1.How can I place an order for SN74CBTD3861PWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD3861PWE4 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 SN74CBTD3861PWE4 reliable?
The price and inventory of SN74CBTD3861PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3861PWE4 is usually 5 days.
3.What payment methods are accepted for SN74CBTD3861PWE4?
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SN74CBTD3861PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTD3861PWE4 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 SN74CBTD3861PWE4?
For technical support, including SN74CBTD3861PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3861PWE4 requirements.
6.How does Aetrix verify that SN74CBTD3861PWE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBTD3861PWE4 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 SN74CBTD3861PWE4 meets industry standards.
7.What is the process for return or replacement of SN74CBTD3861PWE4?
All SN74CBTD3861PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3861PWE4, 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 SN74CBTD3861PWE4 part is unused and in its original packaging.
Return procedure for SN74CBTD3861PWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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