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Texas Instruments SN74CBT3306CD
- Part No.:
- SN74CBT3306CD
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3306CD.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
SN74CBT3306CD from Texas Instruments is a dual 1-bit high-speed FET bus switch IC with bidirectional signal flow, 3 Ω typical ON-state resistance (ron), near-zero propagation delay (0.15 ns at VCC = 5 V), and undershoot protection up to −2 V on both A and B ports - used for USB interface isolation and low-distortion signal gating in mixed-voltage systems.
For engineers reviewing the SN74CBT3306CD datasheet, SN74CBT3306CD pinout, SN74CBT3306CD application, or SN74CBT3306CD equivalent, key selection criteria include its 4–5.5 V VCC operation, Ioff partial-power-down support, 0–5 V data I/O voltage tolerance, and SOIC-8 package compatibility with legacy 5-V/3.3-V TTL/CMOS control interfaces.
Technical Context
The SN74CBT3306CD implements two independent FET-based analog/digital switches, each controlled by dedicated OE inputs (1OE, 2OE), enabling per-channel enable/disable with no propagation delay penalty. Its internal undershoot-protection circuitry actively clamps A/B port voltages down to −2 V while maintaining OFF-state isolation.
It features Ioff functionality that blocks current backflow during partial power-down, supports 0–5 V signaling across all I/Os regardless of VCC level, and maintains high-impedance isolation when OE is high - critical for hot-swap and bus arbitration applications requiring clean signal gating without loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - enables direct integration into 5-V and 5-V-tolerant 3.3-V systems without level shifters. |
| ron (Typical) | 3 Ω - minimizes voltage drop and signal attenuation in high-speed digital or analog signal paths. |
| tpd (Max) | 0.24 ns at VCC = 4 V - ensures near-transparent signal transmission for >1 GHz edge rates. |
| Cio(OFF) (Typical) | 5 pF - reduces capacitive loading on driven buses, preserving signal integrity and timing margins. |
| Undershoot Protection | −2 V on A/B ports - prevents false triggering or latch-up during transient negative excursions in noisy environments. |
| Ioff Leakage | 10 µA at VCC = 0 V - guarantees robust isolation and zero backfeed current during system power sequencing. |
| VI/O Range | 0 V to 5.5 V - supports interoperability across 0.8-V to 5-V logic families without external biasing. |
Pinout & Package
SN74CBT3306CD is housed in an 8-pin SOIC (D) package, 3.91 mm wide, 4.9 mm long, 1.75 mm max height, with standard 1.27 mm pitch and RoHS-compliant NiPdAu lead finish (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 output-enable input | Active-low control: drives 1A↔1B path ON when low; high-impedance isolation when high. |
| 1A / 1B | Channel 1 bidirectional data terminals | Fully symmetric I/O ports - no directionality; signal flows A→B or B→A with identical ron and Cio. |
| GND | Ground reference | Common return for VCC, control, and I/O signals; required for undershoot clamp diode operation. |
| VCC | Positive supply | Power rail defining logic thresholds and switch conduction; also supplies internal clamp circuitry. |
| 2OE | Channel 2 output-enable input | Independent active-low enable for second 1-bit switch; allows asynchronous channel control. |
| 2B / 2A | Channel 2 bidirectional data terminals | Electrically identical to 1A/1B; supports dual independent gating or combined 2-bit bus switching. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal pass-through for clock, data, or analog waveforms without added latency or direction control logic. |
| Undershoot protection (−2 V) | Prevents erroneous turn-on or damage during ESD transients or ground bounce, eliminating need for external clamping diodes. |
| Ioff partial-power-down support | Blocks reverse current flow when VCC = 0 V, allowing safe insertion/removal in live backplanes or multi-rail systems. |
| 7-voltage-level I/O compatibility | Interoperates natively with 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families - no external level translators required. |
| Low 5-pF OFF-state capacitance | Minimizes crosstalk and timing skew on shared buses, especially critical in high-density PCB layouts with tight trace spacing. |
Applications
| USB 2.0 Data Line Isolation | Legacy Bus Signal Gating |
|---|---|
|
Use Scenario: Isolating D+ and D− lines between host controller and peripheral during enumeration or fault conditions. IC Role / Device Role / Timing Role: Dual-channel bidirectional switch providing independent enable control for each differential pair with sub-ns delay. Use Value: Maintains USB 2.0 signal integrity (480 Mbps) while enabling hot-plug detection and overvoltage fault containment via undershoot clamping. |
Use Scenario: Enabling/disabling legacy parallel or serial bus segments (e.g., ISA, LPC, or SMBus) in embedded industrial controllers. IC Role / Device Role / Timing Role: Low-latency, voltage-agnostic bus switch supporting mixed-voltage subsystems without timing penalties. Use Value: Eliminates bus contention during firmware updates or module replacement by inserting high-impedance breaks with <5 pF loading. |
| Hot-Swappable Module Interface | Mixed-Voltage Logic Translation |
|
Use Scenario: Interfacing field-replaceable modules (e.g., sensor cards or comms daughterboards) to a powered-backplane motherboard. IC Role / Device Role / Timing Role: Ioff-enabled isolation switch ensuring no backfeed current during module insertion/removal under power. Use Value: Prevents system reset or corruption during live module swaps by blocking VCC-to-VCC leakage paths and enforcing clean power sequencing. |
Use Scenario: Connecting 1.8-V FPGA I/O banks to 3.3-V or 5-V peripherals (e.g., EEPROM, ADC, or display drivers) without level-shifter ICs. IC Role / Device Role / Timing Role: Passive voltage-tolerant switch leveraging ron and VI/O range to pass signals across voltage domains. Use Value: Reduces BOM count and layout area versus discrete MOSFET or dedicated translator solutions while preserving 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 |
|---|---|---|---|
| SN74CBTD3306CD | Includes 25-Ω series termination resistors on all I/Os; higher ron (12 Ω typical); same SOIC-8 footprint. | Better suited for high-speed point-to-point links requiring impedance matching; less ideal for low-loss analog or wide-voltage-range use. | Select when board layout lacks external termination and signal integrity demands controlled impedance over minimal loss. |
| SN74LVC1G3157DCKR | Single-channel SPDT switch; 3.3-V only VCC (1.65–5.5 V); lower ron (0.5 Ω typical); SC70-6 package. | Not pin-compatible; requires redesign for dual-channel operation; optimized for space-constrained 3.3-V systems. | Choose for compact single-line switching where size outweighs dual-channel requirement and 5-V tolerance is unnecessary. |
Compared with SN74CBT3306CD, SN74CBTD3306CD trades lower signal distortion for higher conduction loss and fixed termination, while SN74LVC1G3157DCKR offers superior ron and density but sacrifices dual-channel integration and full 5-V I/O compatibility.
Availability
SN74CBT3306CD is available at Aetrix Electronics and suitable for USB interface isolation, legacy bus gating, and hot-swappable module interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74CBT3306CD 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 decades of expertise in high-speed logic and interface solutions.
The SN74CBT3306CD belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for ultra-low-latency, voltage-flexible signal routing in mixed-signal and computing infrastructure applications.
FAQ
What is the maximum undershoot voltage the SN74CBT3306CD can tolerate on its A and B ports?
The SN74CBT3306CD provides active undershoot protection up to −2 V on both A and B ports, verified per test conditions in the SCDS127A datasheet. This protection remains effective across the full operating temperature range (−40°C to 85°C) and does not require external components. The SN74CBT3306CD achieves this using integrated clamp circuitry that senses negative excursions and forces the switch into a safe OFF state.
Can the SN74CBT3306CD operate with a 3.3-V supply voltage?
No - the SN74CBT3306CD has a minimum VCC specification of 4 V per the recommended operating conditions table. It is not rated for reliable operation below 4 V, and attempting to power it at 3.3 V may result in undefined logic behavior, increased ron, or failure to maintain undershoot protection. For 3.3-V systems, consider the SN74LVC1G3157DCKR or SN74CB3Q3257PWR as alternatives.
Does the SN74CBT3306CD support hot-swap applications?
Yes - the SN74CBT3306CD supports hot-swap via its Ioff feature, which limits current backflow to 10 µA when VCC = 0 V. This enables safe insertion and removal in live systems, provided OE pins are pulled to VCC (or GND) through appropriate resistors to ensure defined states during power transitions. The SN74CBT3306CD's −2 V undershoot tolerance further enhances robustness during plug-in events.
What is the typical ON-state resistance (ron) of the SN74CBT3306CD and how does it vary with voltage?
The SN74CBT3306CD has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA, and 3 Ω at VCC = 4 V with IO = −15 mA. Ron remains stable across its 4–5.5 V VCC range and shows minimal dependence on signal voltage due to its FET architecture. This low, consistent ron ensures predictable voltage drop and minimal power dissipation in both digital and analog signal paths.
Is the SN74CBT3306CD pin-compatible with other members of the SN74CBT3306x family?
Yes - the SN74CBT3306CD shares identical pinout and function with all variants in the SN74CBT3306x family (e.g., SN74CBT3306CDR, SN74CBT3306CPW), differing only in packaging (SOIC vs TSSOP) and reel/tube configuration. All variants use the same CU306C top-side marking and support identical electrical specifications, enabling drop-in substitution within the same package type.
SN74CBT3306CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 2
- 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:
- 8-SOIC
SN74CBT3306CD FAQ
1.How can I place an order for SN74CBT3306CD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306CD 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 SN74CBT3306CD reliable?
The price and inventory of SN74CBT3306CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306CD is usually 5 days.
3.What payment methods are accepted for SN74CBT3306CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3306CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3306CD?
SN74CBT3306CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3306CD 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 SN74CBT3306CD?
For technical support, including SN74CBT3306CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306CD requirements.
6.How does Aetrix verify that SN74CBT3306CD is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306CD 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 SN74CBT3306CD meets industry standards.
7.What is the process for return or replacement of SN74CBT3306CD?
All SN74CBT3306CD units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306CD, 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 SN74CBT3306CD part is unused and in its original packaging.
Return procedure for SN74CBT3306CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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