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Texas Instruments 74CB3Q3306ADCURE4
- Part No.:
- 74CB3Q3306ADCURE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-VFSOP (0.091", 2.30mm Width)
- Datasheet:
-
74CB3Q3306ADCURE4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
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Product details
Overview
74CB3Q3306ADCURE4 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 with 2.5 V/3.3 V supply operation, 4 Ω typical ON-state resistance (ron), <0.2 ns propagation delay, and 5-V-tolerant I/Os - enabling use in USB interface, bus isolation, and differential signal gating applications.
For engineers reviewing the 74CB3Q3306ADCURE4 datasheet, 74CB3Q3306ADCURE4 pinout, 74CB3Q3306ADCURE4 application, or 74CB3Q3306ADCURE4 equivalent, key selection criteria include its VSSOP-8 (DCU) package, partial-power-down Ioff support, 20 MHz max OE switching frequency, and bidirectional low-distortion signal path with 3.5 pF OFF-state I/O capacitance.
Technical Context
The 74CB3Q3306ADCURE4 implements two independent 1-bit analog/digital bus switches using charge-pump-enhanced NMOS pass transistors to achieve flat, low ron across input voltage range. Each switch is controlled by dedicated OE inputs (1OE, 2OE) supporting TTL- or CMOS-level logic drive.
It operates from 2.3 V to 3.6 V VCC, supports 0–5 V signaling on A/B ports regardless of VCC (2.5 V or 3.3 V), and includes undershoot clamp diodes, Ioff protection for partial-power-down mode, and JESD22-tested ESD robustness (2000-V HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables interoperability with 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 data paths |
| tpd (Max) | 0.2 ns - delivers near-zero propagation delay for timing-critical interconnects |
| Cio(OFF) (Typ) | 3.5 pF - reduces capacitive loading and preserves signal edge rate in high-frequency buses |
| fOE (Max) | 20 MHz - supports fast enable/disable control for dynamic bus partitioning |
| Ioff | 1 mA max at VCC = 0 V - prevents backflow current during system power sequencing |
| VI/O Range | 0 V to 5.5 V - allows mixed-voltage domain interfacing (e.g., 3.3 V controller to 5 V peripheral) |
Pinout & Package
VSSOP-8 (DCU) package: 2.3 mm × 2.0 mm body, 0.5 mm pitch, 0.9 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 first 1-bit switch - drives internal EN signal to connect 1A ↔ 1B when low |
| 2 | 1A | Data port A of first switch - bidirectional I/O with 5-V tolerance and 3.5 pF OFF capacitance |
| 3 | 1B | Data port B of first switch - electrically identical to 1A; forms low-ron path with 1A when 1OE = L |
| 4 | GND | Ground reference for VCC and all I/Os - must be low-impedance for stable ron and ESD performance |
| 5 | VCC | Positive supply (2.3–3.6 V) - powers charge pump and logic; supplies Ioff protection circuitry |
| 6 | 2OE | Active-low enable for second 1-bit switch - independent control enables asymmetric bus gating |
| 7 | 2A | Data port A of second switch - isolated from 1A/1B; supports concurrent or staggered switching |
| 8 | 2B | Data port B of second switch - completes second independent 1-bit path; shares same VCC/GND |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0–5 V switching | Enables direct interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V logic without external level translators |
| Charge-pump gate drive | Maintains flat ron ≤ 8 Ω across full VI/O range (0–5 V) at VCC = 2.5 V or 3.3 V |
| Ioff partial-power-down | Blocks current flow between A/B ports when VCC = 0 V - critical for hot-swap and multi-rail sequencing |
| Undershoot clamp diodes | Protects inputs against negative transients down to –1.8 V - improves system-level ESD immunity |
| Bidirectional zero-delay path | No direction pin required; signal flows equally well from A→B or B→A with identical timing and impedance |
Applications
| USB Interface | Differential Signal Gating |
|---|---|
Use Scenario: Isolating USB 2.0 D+/D− lines during host enumeration or port sharing. IC Role / Device Role / Timing Role: Dual 1-bit bidirectional switch controlling D+ and D− paths independently via 1OE/2OE. Use Value: 4 Ω ron and 3.5 pF Cio(OFF) preserve signal integrity up to 480 Mbps while enabling clean hot-plug detection. | Use Scenario: Enabling/disabling LVDS or RSDS differential pairs in programmable I/O banks. IC Role / Device Role / Timing Role: Low-capacitance, matched-path switch providing symmetrical ON-resistance for both legs of differential pair. Use Value: <0.2 ns tpd and <0.5 Ω ron mismatch ensure skew <10 ps - maintaining common-mode rejection and jitter margin. |
| Bus Isolation | Low-Distortion Signal Routing |
Use Scenario: Segregating legacy parallel buses (e.g., GPIO expansion, memory-mapped peripherals) during firmware updates. IC Role / Device Role / Timing Role: Two independent 1-bit switches isolating address/data/control lines between subsystems. Use Value: Ioff protection prevents backfeeding into powered-down sections; 5-V-tolerant I/Os accommodate mixed-voltage peripherals. | Use Scenario: Routing analog sensor outputs (e.g., audio line-in, ADC reference) through configurable signal paths. IC Role / Device Role / Timing Role: Analog-capable FET switch with flat ron and no DC bias requirement - preserves signal DC accuracy and THD. Use Value: 3.5 pF Cio(OFF) minimizes crosstalk; rail-to-rail 0–5 V range supports ±2.5 V single-ended or 0–3.3 V sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CB3Q3306APWR | TSSOP-8 (PW) package; 4.3 mm × 3.1 mm body; 0.65 mm pitch; higher thermal resistance (88°C/W) | Same electrical specs but larger footprint and lower board density - suited for prototyping or legacy layouts | Select when TSSOP-8 is already standardized in design or reflow profile favors PW package |
| 74LVC1G3157DP | Single 1-bit SPDT switch; 5 V tolerant; ron = 6 Ω typ; Cio(OFF) = 5.5 pF; no charge pump - ron varies with VI/O | Lacks dual independent control and flat ron; unsuitable for simultaneous dual-line gating or precision analog routing | Choose only for space-constrained single-line applications where 20% higher ron and 50% higher OFF capacitance are acceptable |
Compared with SN74CB3Q3306APWR, the 74CB3Q3306ADCURE4 offers 40% smaller PCB area and better thermal performance; compared with 74LVC1G3157DP, it provides true dual-channel independence, flatter ron, and lower OFF capacitance - making it superior for high-fidelity digital or analog signal routing.
Availability
74CB3Q3306ADCURE4 is available at Aetrix Electronics and suitable for USB interface design, differential signal gating, and bus isolation applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 74CB3Q3306ADCURE4 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, scalability, and system-level integration.
The CB3Q family - including the 74CB3Q3306ADCURE4 - was engineered for high-bandwidth, low-distortion signal routing in broadband communications, networking infrastructure, and data-intensive computing systems.
FAQ
What is the maximum operating temperature range for the 74CB3Q3306ADCURE4?
The 74CB3Q3306ADCURE4 is rated for operation from –40°C to +85°C ambient temperature. This range is validated per JEDEC JESD22-A104 and confirmed in TI's recommended operating conditions table. All electrical parameters - including ron, tpd, and Ioff - are guaranteed across this full industrial temperature range when VCC is maintained between 2.3 V and 3.6 V.
Does the 74CB3Q3306ADCURE4 support hot-swap or partial-power-down operation?
Yes, the 74CB3Q3306ADCURE4 supports partial-power-down via its Ioff feature. When VCC = 0 V, the device blocks current flow between A and B ports (Ioff ≤ 1 mA), preventing backdrive into powered-down circuitry. This capability is explicitly tested per JESD78 Class II latch-up and is integral to safe hot-swap implementation in modular systems.
Can the 74CB3Q3306ADCURE4 be used with 1.8 V logic levels?
Yes, the 74CB3Q3306ADCURE4 supports 1.8 V signaling on its data I/Os (1A/1B/2A/2B) when VCC = 2.5 V or 3.3 V. Its 0–5 V rail-to-rail switching architecture and undershoot clamp diodes allow reliable operation with 1.8 V CMOS outputs driving the ports, as confirmed in TI's "Characteristics Over Operating Range" section and SCDA008 application report.
What is the function of the charge pump in the 74CB3Q3306ADCURE4?
The integrated charge pump in the 74CB3Q3306ADCURE4 elevates the gate voltage of the internal NMOS pass transistors to ensure strong enhancement-mode conduction. This achieves low and flat ON-state resistance (ron ≈ 4 Ω) across the full 0–5 V input voltage range - unlike standard transmission gates that exhibit rising ron at low VI/O - directly enabling high-fidelity signal routing without distortion.
Is the 74CB3Q3306ADCURE4 pin-compatible with other members of the CB3Q family?
Yes, the 74CB3Q3306ADCURE4 shares identical pinout and functionality with all SN74CB3Q3306x variants (e.g., SN74CB3Q3306APWR, SN74CB3Q3306ADCUR). The DCU and PW packages have different footprints but identical pin numbering and signal mapping - allowing drop-in substitution where package constraints permit, provided thermal and layout requirements are verified.
74CB3Q3306ADCURE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 8-VFSOP (0.091", 2.30mm 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-VSSOP
74CB3Q3306ADCURE4 FAQ
1.How can I place an order for 74CB3Q3306ADCURE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CB3Q3306ADCURE4 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 74CB3Q3306ADCURE4 reliable?
The price and inventory of 74CB3Q3306ADCURE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q3306ADCURE4 is usually 5 days.
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74CB3Q3306ADCURE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CB3Q3306ADCURE4 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 74CB3Q3306ADCURE4?
For technical support, including 74CB3Q3306ADCURE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q3306ADCURE4 requirements.
6.How does Aetrix verify that 74CB3Q3306ADCURE4 is sourced from the original manufacturer or authorized distributors?
All 74CB3Q3306ADCURE4 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 74CB3Q3306ADCURE4 meets industry standards.
7.What is the process for return or replacement of 74CB3Q3306ADCURE4?
All 74CB3Q3306ADCURE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q3306ADCURE4, 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 74CB3Q3306ADCURE4 part is unused and in its original packaging.
Return procedure for 74CB3Q3306ADCURE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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