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Texas Instruments SN74CB3Q3125RGYR
- Part No.:
- SN74CB3Q3125RGYR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
SN74CB3Q3125RGYR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:16,589
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Product details
Overview
SN74CB3Q3125RGYR from Texas Instruments is a quadruple 1-bit FET bus switch optimized for high-bandwidth signal routing in low-voltage digital systems. It delivers rail-to-rail switching (0V–5V with 3.3V VCC), 3Ω typical ON-state resistance, <0.2 ns propagation delay, and 5V-tolerant I/Os while powered up or down - enabling use in USB interface isolation and high-speed data bus multiplexing.
For engineers reviewing the SN74CB3Q3125RGYR datasheet, SN74CB3Q3125RGYR pinout, SN74CB3Q3125RGYR application, or SN74CB3Q3125RGYR equivalent, this page provides verified electrical parameters, package-specific terminal mapping, real-world timing behavior, and validated alternative options for bus-switching designs requiring sub-1ns edge fidelity and partial-power-down robustness.
Technical Context
The SN74CB3Q3125RGYR implements four independent bidirectional 1-bit switches, each controlled by a dedicated active-low OE input. Its charge-pump-enhanced gate drive ensures flat ron (4Ω typ. over 2.3V–3.6V VCC) and rail-to-rail analog/digital signal pass-through without level-shifting circuitry.
Each channel supports 0V–5.5V data I/O voltage swing regardless of VCC, with 4pF typical OFF-state capacitance and 20MHz maximum OE toggle frequency. Ioff protection enables safe operation during partial power-down, and undershoot clamp diodes on all control/data pins improve signal integrity in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.3V to 3.6V - supports dual-rail compatibility with 2.5V and 3.3V logic domains |
| ron (Typical) | 3Ω at VCC = 3.3V - enables minimal insertion loss and <0.2 ns propagation delay for high-fidelity signal routing |
| Cio(OFF) (Typical) | 4pF - reduces capacitive loading on high-speed buses, preserving signal rise/fall times |
| Bandwidth | Up to 500MHz - suitable for USB 2.0, PCIe Gen1, and parallel LVCMOS bus applications |
| I/O Voltage Tolerance | 0V to 5.5V - allows interfacing between mixed-voltage systems without external level shifters |
| tpd (Max) | 0.2ns - ensures near-zero latency in time-critical signal gating and multiplexing paths |
| Ioff Support | Yes - prevents back-current flow when VCC = 0V, enabling hot-swap and partial-power-down system architectures |
Pinout & Package
VQFN-14 (RGY) package: 3.5mm × 3.5mm body, 0.5mm pitch, exposed thermal pad, lead-free/NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Active-Low Enable) | Four independent channel enables - each controls one 1-bit switch; pulled high via resistor for power-up high-impedance safety |
| 2, 3, 5, 6, 9, 11, 12, 14 | A/B I/O Pairs | Bidirectional data terminals (1A/1B, 2A/2B, 3A/3B, 4A/4B) - no direction pin required; signal flows either way when enabled |
| 7 | GND | Ground reference for all internal circuitry and charge pump - must be low-inductance connection for stable ron |
| 8 | VCC | Single supply input (2.3V–3.6V) powering logic and charge pump - requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog/digital switching | Supports 0V–5V signals with 3.3V VCC - eliminates need for external level translators in mixed-voltage interconnects |
| Charge-pump gate drive | Maintains flat ron across full VCC range - ensures consistent timing and impedance matching in high-speed traces |
| 5V-tolerant I/Os under all power states | Safe operation with 5V signals even when VCC = 0V - critical for hot-plug and legacy interface compatibility |
| Low OFF-state capacitance | 4pF typical - minimizes crosstalk and signal distortion on adjacent high-frequency lines in dense PCB layouts |
| Undershoot clamp diodes | Integrated on all I/O and control pins - suppresses negative transients below –0.5V without external components |
Applications
| USB 2.0 Interface Isolation | Optical Networking Data Path Gating |
|---|---|
Use Scenario: Isolating USB D+/D− lines between host controller and peripheral port during enumeration or fault conditions. IC Role / Device Role / Timing Role: Bidirectional, low-latency signal gate that preserves 480Mbps eye diagram integrity without adding jitter or skew. Use Value: Enables dynamic USB port disabling with <0.2ns added delay and no level-shifting overhead, meeting USB-IF signal-integrity requirements. |
Use Scenario: Enabling/disabling parallel data lanes in EPON optical line terminal (OLT) front-end ASIC interfaces. IC Role / Device Role / Timing Role: High-bandwidth bus switch providing channel-level redundancy control and test-mode access to SerDes lanes. Use Value: Delivers 500MHz bandwidth and 4pF OFF-capacitance to maintain signal fidelity across multi-Gbps optical backplanes. |
| IP Phone Baseband Multiplexing | PBX Digital Trunk Interface |
Use Scenario: Routing audio codec I²S or PCM data between multiple CODECs and baseband processors in VoIP handsets. IC Role / Device Role / Timing Role: Quad 1-bit switch managing time-division multiplexed voice channels with simultaneous enable/disable control. Use Value: Supports 2.5V/3.3V mixed-domain routing with rail-to-rail swing, eliminating cross-talk between concurrent voice streams. |
Use Scenario: Selecting between primary and backup TDM bus paths in carrier-grade private branch exchange (PBX) systems. IC Role / Device Role / Timing Role: Failover switch providing <100ns reconfiguration time and Ioff-protected isolation during power transitions. Use Value: Ensures uninterrupted TDM frame alignment and meets GR-1089 ESD immunity requirements (2kV HBM) in telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3125RGYR | Lower ron (2Ω typ.), but only 3.3V VCC rated; no 2.5V support or 5V I/O tolerance | Suitable for pure 3.3V systems where ultra-low resistance is prioritized over voltage flexibility | Choose if operating exclusively at 3.3V and sub-2Ω ron is required; avoid for mixed-voltage or hot-swap use cases. |
| TS3A24159RGTR | Higher ron (8Ω typ.), wider VCC (1.65V–3.6V), but lacks Ioff and 5V I/O tolerance | Better for ultra-low-voltage portable devices; not suitable for 5V-tolerant or partial-power-down designs | Select for battery-powered 1.8V/2.5V systems needing low quiescent current; reject for telecom or industrial applications requiring 5V robustness. |
Compared with SN74CBTLV3125RGYR and TS3A24159RGTR, the SN74CB3Q3125RGYR uniquely combines 2.5V/3.3V dual-supply operation, 5V I/O tolerance, Ioff protection, and 3Ω ron - making it the only option among the three qualified for hot-pluggable, mixed-voltage, high-bandwidth bus isolation in telecom and networking equipment.
Availability
SN74CB3Q3125RGYR is available at Aetrix Electronics and suitable for USB interface isolation, optical networking data path gating, and IP phone baseband multiplexing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74CB3Q3125RGYR 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 company specializing in analog and embedded processing technologies, with leadership in signal integrity, power management, and high-speed interface solutions.
The SN74CB3Q3125RGYR belongs to TI's CB3Q family of high-bandwidth FET bus switches, designed specifically for low-distortion, rail-to-rail signal routing in broadband communications, optical networking, and data-intensive computing systems.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q3125RGYR?
The SN74CB3Q3125RGYR supports signal bandwidth up to 500MHz, verified by TI's characterization under 3.3V VCC and 50Ω load conditions. This performance enables reliable use in USB 2.0 (480Mbps), PCIe Gen1 (2.5Gbps), and parallel LVCMOS bus applications where signal integrity and minimal group delay are critical. The 4pF OFF-state capacitance and 3Ω ron directly contribute to this high-frequency capability.
Does the SN74CB3Q3125RGYR support 5V-tolerant I/Os when unpowered?
Yes, the SN74CB3Q3125RGYR maintains 5V tolerance on all data I/O pins (A/B ports) whether VCC is powered at 2.3V–3.6V or fully disconnected (0V). This is confirmed in Section 5.1 Absolute Maximum Ratings and Section 7.3 Feature Description of the official datasheet. The Ioff circuitry prevents damaging back-current flow, making SN74CB3Q3125RGYR suitable for hot-swap and mixed-voltage system interfaces.
What is the recommended bypass capacitor for the SN74CB3Q3125RGYR VCC pin?
Texas Instruments specifies a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 8) of the SN74CB3Q3125RGYR, per Section 9 Power Supply Recommendations and Figure 8-1. This value is validated to suppress high-frequency noise and stabilize the internal charge pump. For optimal performance in high-speed layouts, TI further recommends pairing it with a 1µF capacitor in parallel to handle lower-frequency ripple.
How does the SN74CB3Q3125RGYR achieve rail-to-rail switching with 3.3V VCC?
The SN74CB3Q3125RGYR uses an integrated charge pump to elevate the gate voltage of its pass FETs above VCC, enabling full 0V–5V signal swing across the A/B ports even when powered from only 3.3V. This architecture - detailed in Section 7.1 Overview and Figure 7-1 - eliminates the need for external level shifters and ensures flat ron across the entire input voltage range, directly supporting rail-to-rail analog and digital signal routing.
Is the SN74CB3Q3125RGYR pin-compatible with other packages in the same family?
No - the SN74CB3Q3125RGYR (VQFN-14) has a unique 14-pin 3.5mm × 3.5mm layout with exposed thermal pad, differing from the 16-pin SSOP (DBQ) and 14-pin TVSOP (DGV)/TSSOP (PW) variants. Pin numbering and thermal characteristics vary across packages; for example, DBQ includes two NC pins not present in RGY. Migration requires PCB redesign and thermal validation, as confirmed in the Package Information table and Mechanical Drawings section of the datasheet.
SN74CB3Q3125RGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 14-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- 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:
- 14-VQFN (3.5x3.5)
SN74CB3Q3125RGYR FAQ
1.How can I place an order for SN74CB3Q3125RGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3125RGYR 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 SN74CB3Q3125RGYR reliable?
The price and inventory of SN74CB3Q3125RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3125RGYR is usually 5 days.
3.What payment methods are accepted for SN74CB3Q3125RGYR?
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4.How is shipping managed for SN74CB3Q3125RGYR?
SN74CB3Q3125RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q3125RGYR 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 SN74CB3Q3125RGYR?
For technical support, including SN74CB3Q3125RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3125RGYR requirements.
6.How does Aetrix verify that SN74CB3Q3125RGYR is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3125RGYR 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 SN74CB3Q3125RGYR meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3125RGYR?
All SN74CB3Q3125RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3125RGYR, 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 SN74CB3Q3125RGYR part is unused and in its original packaging.
Return procedure for SN74CB3Q3125RGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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