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Texas Instruments SN74CBT3861PWR
- Part No.:
- SN74CBT3861PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3861PWR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,164
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Product details
Overview
SN74CBT3861PWR 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 bidirectional A↔B port connection. 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, peripheral multiplexing, and hot-swap I/O buffering.
For engineers reviewing the SN74CBT3861PWR datasheet, SN74CBT3861PWR pinout, SN74CBT3861PWR application, or SN74CBT3861PWR equivalent, key selection criteria include on-resistance matching (5–7 Ω), propagation delay under 0.35 ns at 4 V, OE-controlled high-impedance isolation, and TSSOP-24 thermal performance (θJA = 88°C/W).
Technical Context
This device implements ten independent NMOS transmission-gate switches in a single monolithic IC, each with symmetrical A/B terminals and no internal directionality. The OE input controls all ten channels simultaneously using active-low logic, with latch-up immunity exceeding 250 mA per JESD 17.
It requires no external biasing or level-shifting circuitry due to TTL-compatible VIH/VIL thresholds (2 V/0.8 V) and supports rail-to-rail signal pass-through up to VCC = 5.5 V. Input and output capacitance are tightly controlled (Ci = 3 pF, Cio(OFF) = 5 pF) to minimize loading on high-frequency buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω typical at VCC = 4.5 V; ensures minimal voltage drop and signal distortion in 3.3 V/5 V digital bus paths. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V; enables sub-nanosecond timing integrity for high-speed parallel interfaces. |
| Supply voltage range | 4 V to 5.5 V; compatible with standard 5 V TTL and mixed-voltage systems without level translators. |
| Input voltage thresholds | VIH = 2 V min, VIL = 0.8 V max; guarantees robust noise margin and direct interfacing with legacy TTL outputs. |
| Off-state capacitance | Cio(OFF) = 5 pF max; limits crosstalk and capacitive loading when ports are isolated. |
| Operating temperature | –40°C to +85°C; qualified for industrial-grade embedded control and communications equipment. |
| Package thermal resistance | θJA = 88°C/W (TSSOP-PW); defines maximum power dissipation limit under natural convection PCB layout. |
Pinout & Package
TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm height, lead-free NIPDAU finish, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | No-connect (NC) | Internally unconnected; must remain floating or grounded per PCB layout guidelines - no electrical function. |
| 2–11 | A1–A10 | Input/output port A side; bidirectional signal terminals connected through low-ron FETs to corresponding B pins when OE is low. |
| 12 | GND | Power ground reference for all internal circuitry and signal return path. |
| 13 | VCC | Positive supply rail (4–5.5 V); powers internal switch control logic and FET gate drive. |
| 14 | OE | Active-low output-enable; drives all ten switches ON (A↔B connected) when low, OFF (high-Z isolation) when high. |
| 15–23 | B1–B10 | Input/output port B side; electrically identical and interchangeable with A pins in bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low on-resistance | 5–7 Ω ensures <10 mV drop at 64 mA channel current - critical for maintaining logic-level margins in dense bus architectures. |
| Sub-nanosecond propagation delay | 0.25 ns max at 5 V enables use in >1 GHz clock-domain crossing and high-frequency address/data multiplexing. |
| TTL-compatible control interface | OE accepts standard 5 V TTL logic levels without pull-ups or level shifters - simplifies integration with legacy microcontrollers. |
| High-impedance isolation state | OFF-state leakage <±1 µA and Cio(OFF) = 5 pF prevent signal coupling between inactive bus segments during dynamic reconfiguration. |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - eliminates risk of destructive latch-up during hot-insertion or ESD transients in live backplanes. |
Applications
| Memory Expansion Interface | Peripheral Multiplexer |
|---|---|
|
Use Scenario: Isolating multiple SRAM or Flash devices sharing a common data/address bus on an MCU-based controller board. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to discrete memory banks while maintaining signal integrity. Use Value: 5 Ω ron and 0.25 ns tpd preserve setup/hold timing margins across 10-bit parallel paths at up to 100 MHz bus rates. |
Use Scenario: Sharing a single UART or SPI interface among multiple sensors or actuators via software-controlled routing. IC Role / Device Role / Timing Role: OE-gated signal path selector allowing dynamic reconfiguration of I/O resources without hardware changes. Use Value: TTL-compatible OE input and <1 µA off-state leakage ensure clean signal isolation and zero static power draw in disabled states. |
| Hot-Swap I/O Buffer | Logic-Level Translation Bridge |
|
Use Scenario: Protecting host system logic from transient currents during insertion/removal of daughter cards in modular industrial controllers. IC Role / Device Role / Timing Role: High-impedance barrier activated only during safe operational windows, blocking fault propagation. Use Value: JESD 17 latch-up rating >250 mA prevents catastrophic failure during live-connect events in ruggedized field equipment. |
Use Scenario: Interfacing 3.3 V FPGA I/O banks with 5 V legacy peripherals where voltage translation must preserve edge rate and skew. IC Role / Device Role / Timing Role: Passive analog switch providing level-agnostic signal pass-through without introducing propagation skew. Use Value: Symmetrical A/B structure and matched ron (<±0.5 Ω variation) maintain <5 ps inter-bit skew across all 10 channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3861PWR | Includes bus-hold circuitry on all A/B pins; higher ICC (10 µA typical) and slightly higher ron (6–8 Ω). | Eliminates need for external pull-up/down resistors on floating bus lines; suited for systems with intermittent signal activity. | Select when bus stability during idle periods is required; avoid if ultra-low static power or minimal ron is critical. |
| SN74LVC1G3157DCKR | Single-pole double-throw (SPDT) 2-channel switch; lower ron (5 Ω), but only 2 channels and no 10-bit grouping. | Used for signal routing rather than parallel bus isolation; lacks synchronized multi-bit enable control. | Choose for compact point-to-point switching; not suitable for simultaneous 10-bit path control or shared OE architecture. |
Compared with SN74CBT3861PWR, SN74CBTD3861PWR adds bus-hold functionality at the cost of higher quiescent current and marginally increased resistance, while SN74LVC1G3157DCKR offers finer-grained routing flexibility but cannot replace 10-bit coordinated switching in memory or peripheral bus designs.
Availability
SN74CBT3861PWR is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral multiplexing, hot-swap I/O buffering, and logic-level translation bridges requiring stable component supply and industrial temperature support.
Supply support for SN74CBT3861PWR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBT series delivers high-speed, low-distortion bus switching for digital system interconnects - designed specifically for minimizing propagation delay and maintaining signal fidelity in dense, multi-drop parallel architectures.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT3861PWR?
The SN74CBT3861PWR supports a continuous channel current of 128 mA per switch path, verified under recommended operating conditions (VCC = 4–5.5 V, TA = –40°C to 85°C). This rating ensures reliable operation in high-drive digital bus applications without thermal derating at full industrial temperature range. Exceeding this current may trigger thermal shutdown or degrade long-term reliability.
Does the SN74CBT3861PWR require external pull-up or pull-down resistors on its A/B ports?
No, the SN74CBT3861PWR does not integrate bus-hold circuitry, so external pull-up or pull-down resistors are required only if signal lines must be held to a defined logic state during OE-high (high-impedance) periods. The device itself presents near-infinite impedance when disabled, making external biasing optional and design-dependent - unlike the SN74CBTD3861PWR variant which includes built-in bus-hold.
Can the SN74CBT3861PWR operate with a 3.3 V supply voltage?
No, the SN74CBT3861PWR has a minimum recommended supply voltage of 4 V per its datasheet's "recommended operating conditions." Operation below 4 V risks undefined switching behavior, increased ron, and failure to meet VIH/VIL thresholds. For 3.3 V systems, consider TI's SN74LVC series or level-shifting solutions instead of direct substitution of SN74CBT3861PWR.
What is the meaning of the "CU861" top-side marking on the SN74CBT3861PWR package?
The "CU861" marking on the SN74CBT3861PWR indicates the device-specific die revision and assembly lot code assigned by Texas Instruments for traceability. It distinguishes this TSSOP-24 variant from other SN74CBT3861 package types (e.g., "CBT3861" on SOIC and SSOP versions) and confirms authenticity and manufacturing compliance per TI's packaging standards.
How does the SN74CBT3861PWR handle input signals exceeding VCC?
The SN74CBT3861PWR allows input voltages up to 7 V (absolute maximum rating), independent of VCC, provided clamp current remains within –50 mA. This tolerance supports mixed-voltage interfacing - for example, connecting a 5 V signal source to a 4.5 V powered SN74CBT3861PWR - as long as external current limiting is applied to prevent exceeding IIK limits during overvoltage events.
SN74CBT3861PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
SN74CBT3861PWR FAQ
1.How can I place an order for SN74CBT3861PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3861PWR 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 SN74CBT3861PWR reliable?
The price and inventory of SN74CBT3861PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3861PWR is usually 5 days.
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SN74CBT3861PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3861PWR 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 SN74CBT3861PWR?
For technical support, including SN74CBT3861PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3861PWR requirements.
6.How does Aetrix verify that SN74CBT3861PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3861PWR 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 SN74CBT3861PWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3861PWR?
All SN74CBT3861PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3861PWR, 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 SN74CBT3861PWR part is unused and in its original packaging.
Return procedure for SN74CBT3861PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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