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Texas Instruments SN74CB3Q3306APWR
- Part No.:
- SN74CB3Q3306APWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q3306APWR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,707
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Product details
Overview
SN74CB3Q3306APWR from Texas Instruments is a dual 1-bit FET bus switch IC designed for high-bandwidth signal routing in low-voltage digital systems. It features rail-to-rail 0–5 V switching capability with 2.3–3.6 V VCC operation, 4 Ω typical ON-state resistance, <0.2 ns propagation delay, and bidirectional data flow-enabling USB interface isolation and differential signal gating in compact TSSOP-8 layouts.
For engineers reviewing the SN74CB3Q3306APWR datasheet, SN74CB3Q3306APWR pinout, SN74CB3Q3306APWR application, or SN74CB3Q3306APWR equivalent, key selection criteria include its 5-V-tolerant I/Os under powered-down conditions, Ioff partial-power-down support, 3.5 pF OFF-state I/O capacitance, and 20 MHz maximum OE switching frequency for high-speed bus control.
Technical Context
The SN74CB3Q3306APWR implements two independent 1-bit FET switches with separate output-enable (1OE, 2OE) inputs and charge-pump gate drive to maintain flat, low ron across 0–5 V signal swings. Each switch supports bidirectional conduction with near-zero propagation delay and rail-to-rail voltage translation between A and B ports.
Its Ioff circuitry actively blocks current backflow when VCC = 0 V, enabling safe hot-insertion and partial-power-down operation. The device operates with TTL- or CMOS-compatible control inputs and maintains 5-V tolerance on all I/O pins regardless of VCC state-critical for mixed-voltage system interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables interoperability with both 2.5 V and 3.3 V logic domains without level shifters |
| ron (Typ) | 4 Ω at VCC = 3.3 V - ensures minimal signal attenuation and distortion for high-frequency data paths |
| Propagation Delay | <0.2 ns - supports >500 MHz bandwidth applications with negligible timing skew |
| I/O Capacitance (OFF) | 3.5 pF typ - reduces capacitive loading on buses, preserving signal integrity in dense PCB layouts |
| OE Switching Frequency | 20 MHz max - allows rapid dynamic bus enable/disable control in real-time signal routing |
| Ioff Support | Yes - prevents damaging back-current during power sequencing or partial shutdown |
| ESD Rating | 2000-V HBM, 1000-V CDM - meets industrial-grade robustness requirements without external protection |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for first 1-bit switch - drives internal EN signal to connect 1A ↔ 1B when low |
| 2 | 1A | Data input/output port A for first switch - bidirectional, 5-V tolerant, low-capacitance node |
| 3 | 1B | Data input/output port B for first switch - electrically identical to 1A, forms low-ron path when enabled |
| 4 | GND | Power ground reference - must be low-impedance connection to minimize noise coupling into switch paths |
| 5 | VCC | Supply voltage input - powers charge pump and logic; range 2.3–3.6 V defines operating voltage domain |
| 6 | 2OE | Active-low enable for second 1-bit switch - independent control enables asymmetric bus gating |
| 7 | 2A | Data input/output port A for second switch - isolated from 1A/1B; supports concurrent dual-channel routing |
| 8 | 2B | Data input/output port B for second switch - completes second independent 1-bit path with matched ron and timing |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0–5 V switching | Supports mixed-signal interfaces (e.g., 3.3 V MCU controlling 5 V peripheral) without external level translators |
| 5-V-tolerant I/Os (VCC up/down) | Enables safe interconnection between powered and unpowered subsystems - critical for hot-plug USB or PCIe add-in cards |
| Low 3.5 pF OFF-state capacitance | Minimizes crosstalk and reflection in high-speed parallel buses like memory address/data lines or display pixel clocks |
| Charge-pump gate drive | Maintains consistent 4 Ω ron across full 0–5 V signal swing - eliminates voltage-dependent insertion loss in analog/digital signals |
| Partial-power-down (Ioff) | Prevents back-current flow when VCC = 0 V - satisfies JEDEC JESD78 Class II latch-up immunity (>100 mA) |
Applications
| USB Interface Isolation | Differential Signal Gating |
|---|---|
Use Scenario: Isolating USB 2.0 D+/D− lines between host controller and removable peripheral during enumeration or fault events. IC Role / Device Role / Timing Role: Dual 1-bit switch providing independent, low-distortion path control for each differential pair with sub-ns timing alignment. Use Value: Eliminates need for discrete MOSFETs or analog switches while maintaining 480 Mbps signal fidelity via 4 Ω ron and 3.5 pF Cio(OFF). | Use Scenario: Enabling/disabling LVDS or RSDS video clock/data lanes in portable displays based on panel power state. IC Role / Device Role / Timing Role: Bidirectional bus switch routing differential pairs with matched propagation delay (<0.2 ns) to prevent skew-induced jitter. Use Value: Preserves signal integrity across 0–3.3 V and 0–5 V signaling levels without DC bias or termination changes. |
| Bus Isolation in Mixed-Voltage Systems | Low-Distortion Signal Gating |
Use Scenario: Separating 2.5 V FPGA I/O banks from 3.3 V sensor interface or legacy peripheral bus during configuration or sleep mode. IC Role / Device Role / Timing Role: Voltage-agnostic switch enabling seamless interoperation between non-matching logic families using single VCC supply. Use Value: Achieves 5-V I/O tolerance with 2.3–3.6 V VCC - avoids level-shifter complexity and board space overhead. | Use Scenario: Gating audio DAC output or RF front-end control signals in battery-powered IoT nodes to reduce standby leakage. IC Role / Device Role / Timing Role: Low-leakage (1 μA Ioff), low-capacitance switch enabling precise analog/digital signal blanking without distortion. Use Value: Delivers 3.5 pF OFF-state capacitance and 0.25 mA ICC - minimizes quiescent power and signal perturbation during gated intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3306CPW | No charge pump; ron = 6 Ω typ at 3.3 V; no 5-V tolerance when powered down | Limited to always-powered systems; unsuitable for hot-swap or partial-power-down use cases | Select when cost sensitivity outweighs Ioff and 5-V-tolerance requirements |
| TS3USB30EVM | Single-channel USB 2.0 switch; integrated ESD protection; 5.5 Ω ron; requires 3.3 V only | Optimized specifically for USB D+/D−; lacks dual independent control and general-purpose 0–5 V support | Choose for dedicated USB port switching where footprint and USB compliance are primary constraints |
Compared with SN74CB3Q3306APWR, SN74CBT3306CPW offers lower cost but sacrifices Ioff safety and powered-down 5-V tolerance, while TS3USB30EVM delivers USB-optimized integration at the expense of dual-switch flexibility and wide-voltage-range operation.
Availability
SN74CB3Q3306APWR is available at Aetrix Electronics and suitable for USB interface isolation, differential signal gating, and bus isolation requiring stable component supply across industrial temperature ranges (–40°C to +85°C) and long-lifecycle production programs.
Supply support for SN74CB3Q3306APWR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The SN74CB3Q3306APWR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered for broadband communications, networking, and data-intensive computing systems requiring low-distortion, rail-to-rail signal routing.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q3306APWR?
The SN74CB3Q3306APWR supports up to 500 MHz bandwidth due to its low 4 Ω typical ON-state resistance and 3.5 pF OFF-state I/O capacitance. This performance is validated under recommended operating conditions with 3.3 V VCC and accounts for RC-limited propagation delay (tpd < 0.2 ns). Signal integrity remains intact for USB 2.0 (480 Mbps), DDR clock distribution, and LVDS video links.
Does the SN74CB3Q3306APWR support hot-plug operation when VCC is unpowered?
Yes, the SN74CB3Q3306APWR supports hot-plug operation with VCC = 0 V thanks to its Ioff circuitry and 5-V-tolerant I/Os. When unpowered, it blocks back-current flow up to ±64 mA per switch and maintains high-impedance isolation between A and B ports. This behavior is specified in the absolute maximum ratings and confirmed in the functional description of partial-power-down operation.
Can the SN74CB3Q3306APWR be used for analog signal switching?
Yes, the SN74CB3Q3306APWR is suitable for low-distortion analog signal gating due to its rail-to-rail 0–5 V switching capability, flat 4 Ω ron across input voltage, and low 3.5 pF OFF-state capacitance. It has been applied in audio DAC output blanking and RF control line routing where minimal THD and crosstalk are required. However, it is not characterized for THD or SNR metrics - design validation is recommended for precision analog paths.
What is the recommended pull-up resistor value for OE pins on the SN74CB3Q3306APWR?
The datasheet recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up or power-down. The minimum resistor value depends on the driver's current-sinking capability; for standard CMOS drivers, 10 kΩ is commonly used. TI's application note SCBA004 specifies that unused control inputs must be held at VCC or GND - the SN74CB3Q3306APWR's OE inputs meet this requirement with appropriate external biasing.
How does the charge pump in the SN74CB3Q3306APWR improve performance compared to standard FET switches?
The integrated charge pump in the SN74CB3Q3306APWR elevates the gate voltage of the pass transistor above VCC, ensuring strong enhancement-mode conduction across the full 0–5 V input range. This results in flat 4 Ω ron versus voltage (unlike non-pumped switches whose ron rises sharply near VCC/2), enabling consistent low-loss signal transmission and rail-to-rail switching without dead zones - a key differentiator over alternatives like SN74CBT3306CPW.
SN74CB3Q3306APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
SN74CB3Q3306APWR FAQ
1.How can I place an order for SN74CB3Q3306APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3306APWR 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 SN74CB3Q3306APWR reliable?
The price and inventory of SN74CB3Q3306APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3306APWR is usually 5 days.
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Once your SN74CB3Q3306APWR 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 SN74CB3Q3306APWR?
For technical support, including SN74CB3Q3306APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3306APWR requirements.
6.How does Aetrix verify that SN74CB3Q3306APWR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3306APWR 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 SN74CB3Q3306APWR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3306APWR?
All SN74CB3Q3306APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3306APWR, 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 SN74CB3Q3306APWR part is unused and in its original packaging.
Return procedure for SN74CB3Q3306APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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