My Inquiry
My Account
Texas Instruments SN74CB3Q3306APWRG4
- Part No.:
- SN74CB3Q3306APWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q3306APWRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,276
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CB3Q3306APWRG4 from Texas Instruments is a dual 1-bit FET bus switch optimized for high-bandwidth signal routing in 2.5-V/3.3-V systems. It features rail-to-rail 0–5-V switching capability, 4 Ω typical ON-state resistance (ron), <0.2 ns propagation delay, and 5-V-tolerant I/Os with partial-power-down support via Ioff. It serves as a low-distortion bidirectional interface in USB and differential signaling paths.
For engineers reviewing the SN74CB3Q3306APWRG4 datasheet, SN74CB3Q3306APWRG4 pinout, SN74CB3Q3306APWRG4 application, or SN74CB3Q3306APWRG4 equivalent, key selection criteria include VCC operating range (2.3–3.6 V), 500 MHz bandwidth capability, TSSOP-8 package compatibility, and 3.5 pF typical OFF-state I/O capacitance for minimal signal loading.
Technical Context
The SN74CB3Q3306APWRG4 implements two independent 1-bit FET switches with charge-pump-enhanced gate drive to maintain flat, low ron across input voltage (0–5 V) and supply (2.5 V/3.3 V). Each switch supports bidirectional data flow and exhibits near-zero propagation delay due to its RC-limited tpd (<0.2 ns).
Its control architecture uses active-low OE inputs (1OE, 2OE) to enable/disable each channel independently, while Ioff circuitry ensures isolation and prevents backflow during partial power-down. The device operates with TTL- or CMOS-compatible control inputs and supports 20 MHz maximum OE switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables interoperability across 2.5-V and 3.3-V logic domains without level shifters. |
| ron (Typ) | 4 Ω at VCC = 3.3 V - Ensures minimal insertion loss and signal integrity for high-speed digital/analog signals. |
| Cio(OFF) | 3.5 pF typ - Reduces capacitive loading on buses, preserving edge rates up to 500 MHz. |
| tpd | <0.2 ns - Delivers near-instantaneous signal pass-through with negligible timing skew between channels. |
| Ioff Support | Yes - Blocks current backflow when powered down, enabling safe hot-insertion and mixed-voltage system partitioning. |
| VI/O Range | 0 V to 5.5 V - Allows seamless interfacing with legacy 5-V peripherals while powered from 3.3-V rails. |
| fOE Max | 20 MHz - Supports fast enable/disable cycling for dynamic bus gating in burst-mode protocols. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for Channel 1 - Driven low to connect 1A ↔ 1B; high-Z when high. |
| 2 | 1A | Data terminal A of Channel 1 - Bidirectional I/O port with 5-V tolerance and 3.5 pF OFF capacitance. |
| 3 | 1B | Data terminal B of Channel 1 - Mirror of 1A; forms low-ron (4 Ω) path when 1OE = L. |
| 4 | GND | Ground reference - Required for Ioff functionality and ESD clamp return path. |
| 5 | VCC | Supply rail - Powers internal charge pump and defines logic thresholds; range 2.3–3.6 V. |
| 6 | 2OE | Active-low enable for Channel 2 - Independent control enables asymmetric bus gating. |
| 7 | 2B | Data terminal B of Channel 2 - Electrically identical to 1B; supports concurrent or staggered switching. |
| 8 | 2A | Data terminal A of Channel 2 - Completes second 1-bit switch; shares same ron and Cio specs as Channel 1. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0–5-V switching | Operates with 3.3-V VCC while passing full 0–5-V signals - eliminates external level translators in mixed-voltage USB or PCIe auxiliary paths. |
| Charge-pump gate drive | Elevates FET gate voltage above VCC - maintains flat 4 Ω ron across entire VI/O range (0–5 V), critical for amplitude-consistent analog switching. |
| 5-V-tolerant I/Os (powered up/down) | Withstands 5-V signals regardless of VCC state - enables safe connection to 5-V buses even during power sequencing or brownout. |
| Low OFF-state capacitance | 3.5 pF typical Cio(OFF) - minimizes crosstalk and signal distortion in high-density routing, especially for differential pairs like USB D+/D−. |
| Partial-power-down Ioff | Blocks >99% of back-current when VCC = 0 V - protects upstream drivers and enables modular power management in multi-rail embedded systems. |
Applications
| USB Interface | Differential Signal Interface |
|---|---|
Use Scenario: Isolating USB 2.0 D+ and D− lines between host controller and peripheral port during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional 1-bit bus switch per line - provides 5-V-tolerant, low-capacitance signal path with sub-0.2 ns delay to preserve eye diagram integrity. Use Value: Prevents signal reflection and ground bounce during plug/unplug by decoupling sections while maintaining DC continuity for pull-up detection. | Use Scenario: Gating LVDS or RGMII differential pairs in FPGA-to-ASIC interconnects where dynamic bandwidth allocation is required. IC Role / Device Role / Timing Role: Dual-channel analog/digital switch - leverages flat ron and matched trace routing to minimize skew between complementary signals. Use Value: Enables real-time reconfiguration of high-speed links without introducing jitter or amplitude imbalance across differential legs. |
| Bus Isolation | Low-Distortion Signal Gating |
Use Scenario: Segmenting I²C or SPI buses between isolated power domains (e.g., MCU core vs. sensor subsystem) to prevent latch-up during fault conditions. IC Role / Device Role / Timing Role: Logic-level transparent switch - uses Ioff to enforce high-Z isolation when either domain powers down, blocking fault propagation. Use Value: Eliminates need for optocouplers or discrete MOSFETs while retaining full-speed communication (up to 1 MHz for I²C) during normal operation. | Use Scenario: Routing audio clock or video pixel clock signals through a multiplexer in broadcast equipment where phase noise and jitter must be minimized. IC Role / Device Role / Timing Role: Low-ron, low-Cio analog switch - preserves rise/fall times and reduces harmonic distortion in periodic waveforms up to 500 MHz. Use Value: Maintains sub-picosecond jitter budget in timing-critical applications by avoiding resistive attenuation or capacitive droop in the signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3306CPWRE4 | Higher ron (7 Ω typ), no charge pump, 3.3-V only VCC range (4.5–5.5 V not supported) | Lacks 5-V-tolerant I/Os and rail-to-rail operation - unsuitable for mixed-voltage USB or legacy peripheral interfacing | Select when cost sensitivity outweighs performance; avoid if 0–5-V signal swing or partial-power-down is required. |
| SN74LVC1G3157DCKR | Single-channel, lower bandwidth (200 MHz), higher Cio(OFF) (6.5 pF), no Ioff | Cannot replace dual-channel function without board redesign; lacks isolation during power-off | Only viable for space-constrained single-line gating where full SN74CB3Q3306APWRG4 functionality is not needed. |
Compared with SN74CB3Q3306APWRG4, SN74CBT3306CPWRE4 trades bandwidth and voltage flexibility for lower cost, while SN74LVC1G3157DCKR sacrifices channel count and power-down safety for footprint reduction - neither matches the combination of dual-channel, 5-V-tolerance, Ioff, and 500 MHz capability in the SN74CB3Q3306APWRG4.
Availability
SN74CB3Q3306APWRG4 is available at Aetrix Electronics and suitable for USB interface design, differential signal routing, and bus isolation applications requiring stable component supply and long-term industrial availability.
Supply support for SN74CB3Q3306APWRG4 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 high-reliability components.
The SN74CB3Q3306APWRG4 belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for broadband communications, networking infrastructure, and data-intensive computing systems demanding minimal signal degradation.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q3306APWRG4?
The SN74CB3Q3306APWRG4 supports up to 500 MHz bandwidth, verified by its low 3.5 pF OFF-state I/O capacitance and 4 Ω typical ON-state resistance. This enables clean transmission of high-speed digital signals such as USB 2.0 data streams and RGMII clock/data pairs without significant attenuation or edge rounding. Performance remains consistent across 0–5-V signal swings when powered from 2.5-V or 3.3-V supplies.
Does the SN74CB3Q3306APWRG4 support partial power-down operation?
Yes, the SN74CB3Q3306APWRG4 includes Ioff circuitry that actively blocks current backflow when VCC = 0 V, ensuring safe isolation between powered and unpowered system domains. This feature is critical in applications like hot-swap modules or multi-rail embedded systems where one section may power down while others remain active. The SN74CB3Q3306APWRG4 maintains high-impedance I/O states under these conditions without external biasing.
Can the SN74CB3Q3306APWRG4 interface 5-V signals while operating from a 3.3-V supply?
Yes, the SN74CB3Q3306APWRG4 supports 0–5.5 V signaling on all data I/O pins (1A, 1B, 2A, 2B) regardless of VCC state (2.3–3.6 V), making it ideal for bridging legacy 5-V peripherals to modern 3.3-V controllers. Its 5-V-tolerant I/Os eliminate the need for external level translators in USB, PCI Express auxiliary, or industrial I/O designs - a capability confirmed in the absolute maximum ratings and recommended operating conditions tables of the official datasheet.
What is the pin configuration and package type of the SN74CB3Q3306APWRG4?
The SN74CB3Q3306APWRG4 uses an 8-pin TSSOP package (PW), with pin 1 marked by a corner chamfer. Pinout is: 1=1OE, 2=1A, 3=1B, 4=GND, 5=VCC, 6=2OE, 7=2B, 8=2A. This layout supports compact PCB placement and matches JEDEC MO-153 standard dimensions (3.0 × 4.4 mm body, 0.65 mm pitch). The SN74CB3Q3306APWRG4 does not include an exposed thermal pad.
How does the charge-pump circuit in the SN74CB3Q3306APWRG4 improve performance?
The integrated charge pump in the SN74CB3Q3306APWRG4 elevates the gate voltage of the internal FETs above VCC, ensuring strong turn-on across the full 0–5-V input range. This delivers flat 4 Ω typical ON-state resistance (ron) - unlike non-pumped switches whose ron rises sharply near rail extremes. As a result, the SN74CB3Q3306APWRG4 maintains consistent signal amplitude, minimal propagation delay (<0.2 ns), and low THD in both digital and analog switching roles.
SN74CB3Q3306APWRG4 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:
- Discontinued at Digi-Key
- 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
SN74CB3Q3306APWRG4 FAQ
1.How can I place an order for SN74CB3Q3306APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3306APWRG4 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 SN74CB3Q3306APWRG4 reliable?
The price and inventory of SN74CB3Q3306APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3306APWRG4 is usually 5 days.
3.What payment methods are accepted for SN74CB3Q3306APWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3Q3306APWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CB3Q3306APWRG4?
SN74CB3Q3306APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q3306APWRG4 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 SN74CB3Q3306APWRG4?
For technical support, including SN74CB3Q3306APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3306APWRG4 requirements.
6.How does Aetrix verify that SN74CB3Q3306APWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3306APWRG4 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 SN74CB3Q3306APWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3306APWRG4?
All SN74CB3Q3306APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3306APWRG4, 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 SN74CB3Q3306APWRG4 part is unused and in its original packaging.
Return procedure for SN74CB3Q3306APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CB3Q3306APWRG4 Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
