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Texas Instruments SN74CBT3305CPWRG4
- Part No.:
- SN74CBT3305CPWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3305CPWRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,511
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Product details
Overview
SN74CBT3305CPWRG4 from Texas Instruments is a dual 1-bit FET bus switch IC designed for high-speed, bidirectional signal routing in 4 V–5.5 V systems. It features 3 Ω typical ON-state resistance, –2 V undershoot protection on both A and B ports, and supports 0–5 V signaling across logic families (TTL, 1.8 V, 2.5 V, 3.3 V, 5 V). Used in USB interface isolation and low-distortion analog/digital gating.
For engineers reviewing the SN74CBT3305CPWRG4 datasheet, SN74CBT3305CPWRG4 pinout, SN74CBT3305CPWRG4 application, or SN74CBT3305CPWRG4 equivalent, key selection criteria include Ioff partial-power-down support, 5 pF OFF-state I/O capacitance, ±128 mA continuous switch current, and TSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74CBT3305CPWRG4 implements two independent FET-based transmission gates controlled by separate OE inputs (1OE, 2OE), enabling configurable 1-bit or 2-bit bus switching. Its active undershoot-protection circuitry monitors A/B port voltages and forces OFF-state isolation when signals dip to –2 V - critical for hot-plug and mixed-voltage system robustness.
Each switch operates with near-zero propagation delay (0.15 ns typical at VCC = 4 V), low input/output capacitance (Cio(OFF) = 5 pF), and rail-to-rail voltage handling (VI/O = 0–5.5 V). The device supports partial-power-down via Ioff (10 µA max at VCC = 0), preventing backflow current during system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - compatible with 5-V logic rails and tolerant of supply droop during transient load conditions. |
| ron (Typ) | 3 Ω - enables minimal voltage drop (<150 mV at 50 mA) and preserves signal integrity in high-speed digital/analog paths. |
| Cio(OFF) | 5 pF typical - reduces capacitive loading and crosstalk when switches are disabled, improving signal fidelity in dense routing. |
| tpd (Max) | 0.24 ns at VCC = 5 V - ensures sub-nanosecond timing alignment for DDR, USB, and other high-bandwidth interfaces. |
| Undershoot Protection | –2 V on A/B ports - prevents false turn-on and latch-up during negative transients common in hot-swap and cable-connect scenarios. |
| Ioff (Max) | 10 µA at VCC = 0 - guarantees safe isolation during partial power-down, eliminating backfeed risk in multi-rail embedded systems. |
| VI/O Range | 0 V to 5.5 V - supports level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V domains without external biasing. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm footprint, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-high enable for first 1-bit switch; drives internal gate to connect 1A ↔ 1B when high. |
| 2 | 1A | Input/output terminal of first switch; bidirectional, supports 0–5.5 V signaling. |
| 3 | 1B | Input/output terminal of first switch; electrically identical to 1A, forms low-impedance path when 1OE = H. |
| 4 | GND | Power ground reference for all internal circuitry and undershoot clamp diodes. |
| 5 | VCC | Positive supply (4–5.5 V); powers switch FETs and undershoot protection logic. |
| 6 | 2OE | Active-high enable for second 1-bit switch; independent control allows asymmetric bus gating. |
| 7 | 2B | Input/output terminal of second switch; isolated from 1A/1B when 2OE = L. |
| 8 | 2A | Input/output terminal of second switch; matches 2B in voltage range and drive capability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal pass-through in either direction without direction control pins or latency penalties. |
| –2 V undershoot protection | Hardware-enforced OFF-state retention during negative transients, eliminating need for external clamping diodes. |
| Ioff partial-power-down support | Prevents damaging current flow between powered and unpowered system domains during sleep or reset sequences. |
| 5 pF OFF-state I/O capacitance | Minimizes loading on adjacent traces and preserves rise/fall times in high-frequency data buses (e.g., USB 2.0). |
| 3 Ω typical ON-resistance | Reduces insertion loss and maintains signal amplitude integrity for analog and digital signals up to 100 MHz. |
Applications
| USB 2.0 Interface Isolation | Multi-Voltage Logic Translation |
|---|---|
|
Use Scenario: Isolating USB D+ and D− lines between host controller (3.3 V) and peripheral (5 V) during hot-plug events. IC Role / Device Role / Timing Role: Dual 1-bit bidirectional switch providing galvanic separation while preserving signal edge rates and eye diagram integrity. Use Value: Prevents –2 V undershoot-induced false triggering during cable insertion and eliminates need for discrete TVS/clamp networks. |
Use Scenario: Interfacing a 1.8 V FPGA I/O bank with a 3.3 V sensor interface without level-shifter ICs or resistive dividers. IC Role / Device Role / Timing Role: Voltage-agnostic bidirectional pass gate enabling seamless signal transfer across logic thresholds. Use Value: Maintains <0.24 ns propagation delay and 5 pF OFF-capacitance to avoid timing skew or bandwidth degradation in high-speed sensor links. |
| PCI Express Lane Gating | Analog Signal Multiplexing |
|
Use Scenario: Dynamically enabling/disabling PCIe Gen1 lanes during link training or power state transitions (L0s/L1). IC Role / Device Role / Timing Role: Low-ron, low-Cio switch acting as a hardware-controlled signal gate in the AC-coupled differential path. Use Value: Delivers 3 Ω ON-resistance and 12.5 pF ON-capacitance to minimize insertion loss and maintain impedance continuity in 100 Ω differential pairs. |
Use Scenario: Routing audio or sensor analog signals (e.g., microphone, thermistor) through shared ADC inputs in portable devices. IC Role / Device Role / Timing Role: Bidirectional analog switch supporting rail-to-rail 0–5 V operation with negligible THD and channel-to-channel crosstalk. Use Value: Achieves <–70 dB crosstalk (via 5 pF Cio(OFF)) and <0.01% gain error (via 3 Ω ron matching), preserving signal fidelity in precision measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3305PW | Includes 3.3-V tolerant control inputs (VIH = 2 V max), higher ICC (10 µA), same ron/Cio specs. | Better suited for mixed 3.3 V/5 V control planes; not required when OE is driven by 5-V TTL/CMOS. | Choose if OE signals originate from 3.3 V logic; otherwise SN74CBT3305CPWRG4 offers lower ICC and simpler biasing. |
| 74LVC1G3157GW | Single SPDT switch, smaller SC-70-6 package, 5 V tolerant I/O but no undershoot protection, ron = 5 Ω. | Limited to single-channel use; lacks –2 V undershoot hardening and dual independent OE control. | Select only for space-constrained single-line gating where undershoot immunity is non-critical and dual-switch coordination is unnecessary. |
Compared with SN74CBT3305CPWRG4, SN74CBTD3305PW adds 3.3-V-compatible OE inputs at the cost of higher quiescent current, while 74LVC1G3157GW trades dual-channel flexibility and undershoot protection for ultra-small footprint and single-pole routing.
Availability
SN74CBT3305CPWRG4 is available at Aetrix Electronics and suitable for USB interface isolation, multi-voltage logic translation, and analog signal multiplexing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBT3305CPWRG4 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 solutions, with over 90 years of innovation in high-reliability IC design and manufacturing.
The SN74CBT3305CPWRG4 belongs to TI's CBT (Crossbar Bus Technology) 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 SN74CBT3305CPWRG4 can withstand on its A and B ports?
The SN74CBT3305CPWRG4 provides active undershoot protection down to –2 V on both A and B ports. This is verified per test condition VI/O = –2 V with switch OFF and VCC = 5.5 V, ensuring reliable OFF-state isolation even during hot-plug transients or ESD events. The protection circuit senses the negative excursion and holds the FET gate in cutoff, preventing unintended conduction.
Does the SN74CBT3305CPWRG4 support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3305CPWRG4 supports partial-power-down via its Ioff feature. When VCC = 0 V, leakage current into any I/O or control pin is limited to 10 µA maximum, preventing backflow current that could disrupt other powered domains. This behavior is guaranteed across –40°C to 85°C and eliminates the need for external isolation components during system sleep modes.
What is the typical ON-state resistance of the SN74CBT3305CPWRG4, and how does it vary with operating conditions?
The SN74CBT3305CPWRG4 has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V, IO = 30 mA, and VI = 2.4 V. At VCC = 4 V and IO = 64 mA, ron remains ≤6 Ω. This low, stable resistance ensures minimal voltage drop (<192 mV at 64 mA), preserving signal swing and reducing power dissipation in high-current data paths.
Can the SN74CBT3305CPWRG4 be used for analog signal switching, and what parameters support this use case?
Yes, the SN74CBT3305CPWRG4 is qualified for analog signal switching due to its rail-to-rail I/O voltage range (0–5.5 V), low 5 pF OFF-state capacitance, 12.5 pF ON-state capacitance, and matched 3 Ω ron. These specs enable low distortion, minimal crosstalk (<–70 dB), and flat frequency response up to 100 MHz - making it suitable for audio routing, sensor multiplexing, and precision ADC front-ends.
What package type and footprint does the SN74CBT3305CPWRG4 use, and are PCB layout guidelines available?
The SN74CBT3305CPWRG4 uses the TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height. TI provides official board layout, stencil design, and land pattern recommendations (document ID PW0008A), including solder mask defined pads, 0.125 mm stencil thickness guidance, and IPC-7351-compliant pad dimensions for reliable reflow yield.
SN74CBT3305CPWRG4 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:
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
SN74CBT3305CPWRG4 FAQ
1.How can I place an order for SN74CBT3305CPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3305CPWRG4 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 SN74CBT3305CPWRG4 reliable?
The price and inventory of SN74CBT3305CPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3305CPWRG4 is usually 5 days.
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SN74CBT3305CPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3305CPWRG4 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 SN74CBT3305CPWRG4?
For technical support, including SN74CBT3305CPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3305CPWRG4 requirements.
6.How does Aetrix verify that SN74CBT3305CPWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3305CPWRG4 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 SN74CBT3305CPWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3305CPWRG4?
All SN74CBT3305CPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3305CPWRG4, 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 SN74CBT3305CPWRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3305CPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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