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Texas Instruments SN74CBT3306CPWRG4
- Part No.:
- SN74CBT3306CPWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3306CPWRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
SN74CBT3306CPWRG4 from Texas Instruments is a dual 1-bit high-speed FET bus switch IC with bidirectional signal routing, 3 Ω typical ON-state resistance (ron), −2 V undershoot protection on A/B ports, and 5 pF typical OFF-state I/O capacitance. It operates from 4 V to 5.5 V and supports 0–5 V signaling levels across USB interface and bus isolation applications.
For engineers reviewing the SN74CBT3306CPWRG4 datasheet, SN74CBT3306CPWRG4 pinout, SN74CBT3306CPWRG4 application, or SN74CBT3306CPWRG4 equivalent, key selection criteria include undershoot tolerance, propagation delay (<0.24 ns at 4 V), partial-power-down (Ioff) capability, and TSSOP-8 package compatibility with 0.65 mm pitch PCB layouts.
Technical Context
The SN74CBT3306CPWRG4 implements two independent TTL-compatible FET switches, each controlled by dedicated OE inputs (1OE, 2OE). Its active undershoot-protection circuitry monitors A/B port voltages and forces OFF-state isolation when undershoot exceeds −2 V, preventing false turn-on during signal transients.
Each switch provides near-zero propagation delay via low-impedance FET conduction (ron = 3 Ω typ), minimal loading (Cio(OFF) = 5 pF), and rail-to-rail 0–5 V data I/O support. Ioff functionality ensures backflow current blocking during partial power-down, enabling safe hot-insertion in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables stable operation across industrial 5 V rails and margin-tolerant designs. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and signal distortion for ≤128 mA bidirectional current flow. |
| tpd (Max) | 0.24 ns at VCC = 4 V - Supports high-speed digital gating without timing skew in USB 1.1/2.0 paths. |
| Cio(OFF) | 5 pF typical - Reduces capacitive loading on source and destination buses, preserving signal integrity. |
| Undershoot Protection | −2 V on A/B ports - Prevents unintended conduction during negative transients in noisy environments. |
| Ioff | 10 µA at VCC = 0 V - Blocks damaging back-current during system power sequencing or partial shutdown. |
| VI/O Range | 0 V to 5.5 V - Allows interoperability with 0.8 V–5 V logic families without level-shifting circuitry. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU/SN lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output-enable control for Switch 1 | Active-low: drives 1A↔1B path ON when low; high-impedance isolation when high. |
| 1A | Data input/output terminal A of Switch 1 | Bidirectional node-connects to upstream bus or controller; supports 0–5 V signaling. |
| 1B | Data input/output terminal B of Switch 1 | Bidirectional node-connects to downstream peripheral or isolated segment. |
| GND | Ground reference | Common return for VCC, control, and I/O paths; must be low-impedance for noise immunity. |
| VCC | Positive supply | 4–5.5 V power rail; powers internal clamp diodes and switch FETs; decoupling required. |
| 2OE | Output-enable control for Switch 2 | Independent active-low enable for second 1-bit channel; allows asymmetric gating control. |
| 2B | Data input/output terminal B of Switch 2 | Bidirectional node-used for parallel 2-bit bus isolation or independent signal routing. |
| 2A | Data input/output terminal A of Switch 2 | Bidirectional node-mirrors 1A function; enables dual-channel or single 2-bit configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Undershoot protection | −2 V clamping on A/B ports ensures reliable OFF-state isolation during negative transients in USB or hot-swap interfaces. |
| Bidirectional zero-delay switching | 3 Ω ron and 0.24 ns tpd enable transparent, direction-agnostic signal pass-through without added latency. |
| Multi-voltage I/O compatibility | 0–5 V data I/O range eliminates external level shifters when interfacing 1.8 V, 2.5 V, 3.3 V, and 5 V subsystems. |
| Ioff partial-power-down | 10 µA Ioff blocks reverse current flow when VCC = 0 V, supporting safe power sequencing in modular systems. |
| Low OFF-state capacitance | 5 pF Cio(OFF) minimizes capacitive loading on idle buses, reducing crosstalk and preserving rise/fall times. |
Applications
| USB 1.1 Signal Isolation | Hot-Swappable Peripheral Bus |
|---|---|
|
Use Scenario: Isolating USB D+ and D− lines between host controller and removable peripheral to prevent ground loop noise and ESD coupling. IC Role / Device Role / Timing Role: Dual 1-bit bidirectional switch providing galvanic separation while maintaining full-speed USB timing integrity. Use Value: 0.24 ns propagation delay and 5 pF OFF-capacitance preserve USB 1.1 eye diagram margins; −2 V undershoot protection suppresses transient-induced glitches. |
Use Scenario: Enabling safe insertion/removal of add-in cards in industrial PC backplanes where main power remains active but card rails are unpowered. IC Role / Device Role / Timing Role: Bidirectional bus gate enforcing high-impedance isolation until card power stabilizes and OE is asserted. Use Value: Ioff limits backfeed current to <10 µA during partial power-down, preventing damage to powered-backplane logic. |
| Multi-Voltage Logic Interface | Low-Distortion Analog Signal Gating |
|
Use Scenario: Interfacing a 1.8 V FPGA I/O bank to a 3.3 V sensor interface without level translators or voltage dividers. IC Role / Device Role / Timing Role: Voltage-agnostic bidirectional switch passing signals across voltage domains with no DC bias dependency. Use Value: 0–5 V VI/O range and 3 Ω ron ensure minimal signal attenuation and flat frequency response up to 100 MHz. |
Use Scenario: Gating audio or sensor analog signals in test equipment where signal fidelity and low THD are critical. IC Role / Device Role / Timing Role: Low-distortion analog switch with near-linear RON and symmetric I/O structure for AC-coupled paths. Use Value: 5 pF Cio(OFF) and 3 Ω ron minimize harmonic generation and insertion loss; undershoot protection prevents clipping artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3306PWR | Includes 3.3 V tolerant control inputs (VIH = 2 V min), higher ICC (10 µA max), same ron/Cio. | Preferred for mixed 3.3 V/5 V control logic; not needed if OE drivers are 5 V CMOS/TTL. | Select when OE signals originate from 3.3 V microcontrollers without level shifting. |
| NC7SZ384P6X | Single 1-bit switch, SC70-6 package, 5 Ω ron, 3.5 pF Cio(OFF), no undershoot protection. | Limited to space-constrained single-line gating; lacks −2 V protection and Ioff. | Choose only for ultra-small footprint requirements where undershoot risk is absent and power sequencing is controlled. |
Compared with SN74CBT3306CPWRG4, SN74CBTD3306PWR adds 3.3 V control compatibility at higher quiescent current, while NC7SZ384P6X trades robustness and dual-channel integration for size reduction-neither offers identical undershoot protection or Ioff behavior.
Availability
SN74CBT3306CPWRG4 is available at Aetrix Electronics and suitable for USB interface design, industrial bus isolation, and multi-voltage logic bridging requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT3306CPWRG4 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 logic solutions, with over 90 years of innovation in high-reliability electronic components.
The SN74CBT3306CPWRG4 belongs to TI's CBT (Crossbar Bus Transceiver) logic family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital systems and interface isolation applications.
FAQ
What is the maximum undershoot voltage the SN74CBT3306CPWRG4 can tolerate on its A/B ports?
The SN74CBT3306CPWRG4 tolerates up to −2 V undershoot on both A and B ports due to integrated active undershoot-protection circuitry. This feature senses negative transients and forces the switch into a guaranteed OFF state, preventing unintended conduction. The specification is verified per test conditions in the SCDS127A datasheet with VCC = 5.5 V and switch OFF.
Does the SN74CBT3306CPWRG4 support partial-power-down operation, and how does it behave when VCC = 0 V?
Yes, the SN74CBT3306CPWRG4 supports partial-power-down via its Ioff feature. When VCC = 0 V, Ioff limits reverse current through the switch to ≤10 µA, preventing damaging backflow from live I/O lines into the unpowered device. This behavior is specified under recommended operating conditions and validated per JESD 78 Class II latch-up testing.
What is the typical ON-state resistance (ron) of the SN74CBT3306CPWRG4, and how does it affect signal integrity?
The SN74CBT3306CPWRG4 has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and edge rates for bidirectional data up to ±128 mA. Measured per datasheet Figure 4, it directly contributes to sub-nanosecond propagation delay and low THD in analog gating.
Can the SN74CBT3306CPWRG4 interface 1.8 V logic with 5 V logic without external level shifters?
Yes, the SN74CBT3306CPWRG4 supports 0–5 V signaling on its A/B data I/O ports regardless of VCC (4–5.5 V), enabling direct connection between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains. Control inputs (1OE/2OE) accept TTL or 5 V/3.3 V CMOS levels, eliminating need for discrete level translators in mixed-voltage bus architectures.
What package type and thermal characteristics apply to the SN74CBT3306CPWRG4?
The SN74CBT3306CPWRG4 uses the TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, with θJA = 149°C/W. It features NIPDAU/SN lead finish, RoHS compliance, and MSL Level-1 rating. Thermal performance is validated per JEDEC JESD51-7, and PCB layout guidelines are published in TI's PW0008A package drawing.
SN74CBT3306CPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
SN74CBT3306CPWRG4 FAQ
1.How can I place an order for SN74CBT3306CPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306CPWRG4 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 SN74CBT3306CPWRG4 reliable?
The price and inventory of SN74CBT3306CPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306CPWRG4 is usually 5 days.
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SN74CBT3306CPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3306CPWRG4 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 SN74CBT3306CPWRG4?
For technical support, including SN74CBT3306CPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306CPWRG4 requirements.
6.How does Aetrix verify that SN74CBT3306CPWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306CPWRG4 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 SN74CBT3306CPWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3306CPWRG4?
All SN74CBT3306CPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306CPWRG4, 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 SN74CBT3306CPWRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3306CPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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