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Texas Instruments SN74CB3Q3305PWR
- Part No.:
- SN74CB3Q3305PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q3305PWR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,561
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Product details
Overview
SN74CB3Q3305PWR from Texas Instruments is a dual 1-bit FET bus switch optimized for high-bandwidth, level-translating signal routing in 2.5-V/3.3-V systems. It delivers 3 Ω typical ON-state resistance, 500 MHz bandwidth support, 5-V tolerant I/Os with VCC as low as 2.3 V, and bidirectional near-zero-delay switching-enabling robust interface isolation in optical networking and USB differential signal paths.
For engineers reviewing the SN74CB3Q3305PWR datasheet, SN74CB3Q3305PWR pinout, SN74CB3Q3305PWR application, or SN74CB3Q3305PWR equivalent, key selection criteria include its Ioff-enabled partial-power-down capability, flat ron over voltage/temperature, 3.5 pF OFF-state I/O capacitance, and TSSOP-8 package compatibility with high-density PCB layouts.
Technical Context
The SN74CB3Q3305PWR integrates two independent charge-pump-assisted FET switches, each controlled by dedicated OE inputs (1OE, 2OE), enabling per-channel enable/disable without affecting the other path. Its architecture supports bidirectional signal flow with no direction pin, zero DC bias requirement, and rail-to-rail input voltage tolerance up to 5.5 V regardless of VCC state.
Each switch exhibits flat ON-resistance (3–8 Ω) across 2.3–3.6 V VCC and –40°C to 85°C, achieved via internal gate-boosting that maintains strong channel conduction even at low supply voltages. The device enters high-impedance isolation during power-down via Ioff circuitry, preventing backdrive current when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables operation in both 2.5-V and 3.3-V logic domains without level shifters |
| ron (Typical) | 3 Ω at VCC = 2.5 V - ensures minimal voltage drop and signal attenuation for 30 mA channel currents |
| Cio(OFF) | 3.5 pF typical - reduces capacitive loading on high-speed buses, preserving signal integrity up to 500 MHz |
| fOE Max | 20 MHz - supports fast enable/disable toggling for dynamic bus arbitration in real-time systems |
| tpd | 0.15 ns at VCC = 3.3 V - delivers near-zero propagation delay critical for timing-critical interconnects |
| Ioff Leakage | 1 µA at VCC = 0 V - guarantees safe isolation and prevents back-current damage during hot-swap or partial power-down |
| VI/O Tolerance | 0 V to 5.5 V - allows seamless interfacing between 1.8-V, 2.5-V, 3.3-V, and 5-V subsystems |
Pinout & Package
TSSOP-8 (PW) package: 3.00 mm × 6.10 mm body, 0.65 mm pitch, surface-mount, RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Input | Active-high enable for Channel 1 (1A ↔ 1B); drives switch ON when high, high-Z when low |
| 1A / 1B | I/O | Bidirectional data ports for Channel 1; no polarity or direction constraint; 5-V tolerant |
| GND | Power | Reference ground for all internal circuitry and I/O clamp diodes |
| VCC | Power | Supply for charge pump and control logic; powers internal gate-boost circuitry |
| 2OE | Input | Active-high enable for Channel 2 (2A ↔ 2B); independent of 1OE for flexible channel control |
| 2A / 2B | I/O | Bidirectional data ports for Channel 2; electrically identical to 1A/1B with same voltage tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Charge-pump gate boost | Maintains sub-4 Ω ron down to 2.3 V VCC, eliminating need for external gate drive or higher supply rails |
| 5-V tolerant I/O with VCC = 0 V | Enables true hot-swap capability and safe I/O floating during system power sequencing |
| Independent dual-channel control | Allows asymmetric bus management-e.g., isolate one peripheral while keeping another active |
| Low OFF-state capacitance | 3.5 pF minimizes crosstalk and reflection on adjacent traces in dense high-speed layouts |
| Undershoot clamp diodes | Protects inputs from negative transients below GND, supporting robust operation in noisy industrial environments |
Applications
| Optical Networking Backplane | USB 2.0 Differential Signal Isolation |
|---|---|
Use Scenario: Routing high-speed serial data between SFP+ modules and host FPGA in EPON line cards where multiple voltage domains coexist. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating 3.3-V FPGA I/O from 5-V optical transceiver lanes while maintaining <0.2 ns skew. Use Value: Eliminates need for discrete level translators and reduces BOM count by enabling direct 5-V signal pass-through at 3.3-V VCC. | Use Scenario: Isolating USB D+/D− lines between host controller and peripheral during suspend/resume to prevent leakage current and ensure USB compliance. IC Role / Device Role / Timing Role: Dual-channel switch providing independent enable control per differential pair, with Ioff blocking reverse current during VBUS removal. Use Value: Meets USB 2.0 suspend current limits (<500 µA) via sub-1 µA Ioff, avoiding external power-gating MOSFETs. |
| WiMAX Baseband Interface | IP Phone Audio Data Bus |
Use Scenario: Interfacing 1.8-V baseband processor with 3.3-V RF transceiver in outdoor WiMAX CPE units operating across –40°C to 85°C. IC Role / Device Role / Timing Role: Level-translating bus switch handling bidirectional I²S/PCM audio and control signals with flat ron across full temperature range. Use Value: Maintains consistent 3.5 Ω ron from –40°C to 85°C, preventing gain drift or jitter accumulation in time-sensitive audio paths. | Use Scenario: Multiplexing analog audio codec outputs to multiple handset/headset jacks in VoIP desk phones with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Dual 1-bit switch enabling dynamic jack selection without signal degradation or cross-talk between channels. Use Value: 3.5 pF Cio(OFF) ensures <0.5% signal loss at 20 kHz audio band, preserving voice fidelity during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3305CPWRE4 | No charge pump; ron = 5 Ω typical at 3.3 V; no 5-V tolerance with VCC = 0 V | Limited to powered-only operation; unsuitable for hot-swap or partial-power-down systems | Choose only if cost sensitivity outweighs Ioff and wide-VI/O requirements |
| TS3USB30EIRGER | Single-channel, USB-optimized; integrated ESD protection (±8 kV HBM); ron = 6 Ω typical | Designed specifically for USB 2.0; lacks dual independent OE and 5-V tolerance beyond USB voltage range | Select when USB compliance and integrated ESD are mandatory, and dual-channel independence is not required |
Compared with SN74CB3Q3305PWR, SN74CBT3305CPWRE4 offers lower cost but sacrifices Ioff safety and VI/O margin, while TS3USB30EIRGER adds USB-specific hardening at the expense of general-purpose dual-channel flexibility and wider voltage interoperability.
Availability
SN74CB3Q3305PWR is available at Aetrix Electronics and suitable for optical networking backplanes, USB 2.0 isolation circuits, and WiMAX baseband interfaces requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CB3Q3305PWR 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 for industrial, automotive, and communications markets.
The SN74CB3Q3305PWR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered for low-latency, level-translating signal routing in broadband infrastructure and data-intensive computing systems.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q3305PWR?
The SN74CB3Q3305PWR supports signal bandwidth up to 500 MHz, verified under load conditions with typical ron and Cio(OFF) values. This performance is enabled by its charge-pump architecture and low 3.5 pF OFF-state capacitance, making SN74CB3Q3305PWR suitable for high-speed serial links including USB 2.0 and optical module interfaces.
Does the SN74CB3Q3305PWR support level translation between 1.8-V and 5-V domains?
Yes, the SN74CB3Q3305PWR supports bidirectional level translation: with VCC = 2.5 V, it passes 0–3.3 V signals; with VCC = 3.3 V, it handles 0–5 V signals. Its 5-V tolerant I/Os operate safely even when VCC = 0 V, enabling robust interfacing across 1.8-V, 2.5-V, 3.3-V, and 5-V subsystems without external translators.
How does the Ioff feature protect the SN74CB3Q3305PWR during partial power-down?
The Ioff circuitry in SN74CB3Q3305PWR disables current paths when VCC = 0 V, limiting I/O leakage to just 1 µA. This prevents damaging back-current flow from live 5-V buses into unpowered sections of the system-critical for hot-swap compliance and reliable operation in modular telecom equipment where SN74CB3Q3305PWR is commonly deployed.
Can the SN74CB3Q3305PWR be used with TTL-level control inputs?
Yes, SN74CB3Q3305PWR control inputs (1OE, 2OE) accept TTL-compatible thresholds: VIH = 2.0 V min at VCC ≥ 2.7 V, and VIL = 0.8 V max. This allows direct driving from legacy 5-V TTL logic or 3.3-V CMOS outputs without interface buffers-simplifying design in mixed-logic systems where SN74CB3Q3305PWR serves as a flexible interconnect element.
What is the recommended bypass capacitor for the SN74CB3Q3305PWR VCC pin?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin is recommended for SN74CB3Q3305PWR. This value suppresses high-frequency noise generated by fast switching transitions and ensures stable charge-pump operation. For optimal performance in high-density layouts, TI also recommends pairing it with a 1 µF bulk capacitor nearby to handle lower-frequency supply variations affecting SN74CB3Q3305PWR reliability.
SN74CB3Q3305PWR 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
SN74CB3Q3305PWR FAQ
1.How can I place an order for SN74CB3Q3305PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3305PWR 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 SN74CB3Q3305PWR reliable?
The price and inventory of SN74CB3Q3305PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3305PWR is usually 5 days.
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4.How is shipping managed for SN74CB3Q3305PWR?
SN74CB3Q3305PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q3305PWR 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 SN74CB3Q3305PWR?
For technical support, including SN74CB3Q3305PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3305PWR requirements.
6.How does Aetrix verify that SN74CB3Q3305PWR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3305PWR 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 SN74CB3Q3305PWR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3305PWR?
All SN74CB3Q3305PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3305PWR, 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 SN74CB3Q3305PWR part is unused and in its original packaging.
Return procedure for SN74CB3Q3305PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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