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Texas Instruments SN74CBT3305CPWR
- Part No.:
- SN74CBT3305CPWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3305CPWR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,044
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Product details
Overview
SN74CBT3305CPWR from Texas Instruments is a dual 1-bit FET bus switch IC designed for high-speed, bidirectional signal gating in 5-V systems. It features 3 Ω typical ON-state resistance (ron), <0.24 ns propagation delay at 5 V, and –2-V undershoot protection on both A and B ports. Used in USB interface isolation and low-distortion analog/digital signal routing where rail-to-rail 0–5-V signaling and partial-power-down capability are required.
For engineers reviewing the SN74CBT3305CPWR datasheet, SN74CBT3305CPWR pinout, SN74CBT3305CPWR application, or SN74CBT3305CPWR equivalent, key selection criteria include its Ioff-supported partial-power-down operation, 5-pF OFF-state I/O capacitance for minimal loading, dual independent OE control, TSSOP-8 package compatibility with high-density layouts, and validated –2-V undershoot tolerance during hot-swap or transient events.
Technical Context
The SN74CBT3305CPWR implements two independent single-pole single-throw (SPST) FET switches, each controlled by dedicated OE inputs (1OE, 2OE). Its internal architecture uses NMOS pass transistors with integrated undershoot-protection circuitry that actively clamps A/B port voltages down to –2 V while maintaining OFF-state isolation.
It supports mixed-voltage signaling (0.8 V to 5 V) across data I/Os, operates from 4 V to 5.5 V VCC, and delivers 3 µA max ICC in both ON and OFF states. The Ioff feature ensures no backflow current when VCC = 0 V, enabling safe use in partial-power-down systems without external isolation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables robust operation across industrial 5-V rails and tolerates supply droop without functional loss. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and power loss during signal transmission; critical for low-noise analog gating and high-fidelity digital switching. |
| tpd (Max) | 0.24 ns at VCC = 5 V - Supports >1 GHz signal bandwidth with negligible timing skew in high-speed bus applications. |
| Cio(OFF) | 5 pF typical - Reduces capacitive loading on source and destination nodes, preserving signal integrity and rise/fall times. |
| Undershoot Protection | –2 V on A/B ports - Prevents false turn-on and latch-up during negative transients, essential for hot-plug USB and legacy bus interfaces. |
| Ioff | 10 µA max at VCC = 0 V - Blocks damaging back-current flow during system power sequencing, eliminating need for external blocking diodes. |
| VI/O Range | 0 V to 5.5 V - Allows interoperability with 0.8-V, 1.2-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without level shifters. |
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 input 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-V signaling and –2-V undershoot. |
| 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 internal bias networks and enables Ioff functionality during power-down. |
| 6 | 2OE | Active-high enable input for second 1-bit switch; independent control allows asymmetric bus gating. |
| 7 | 2B | Input/output terminal of second switch; fully isolated from 1A/1B when 2OE = L. |
| 8 | 2A | Input/output terminal of second switch; matches 2B electrical characteristics and undershoot tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional low-ron switching | 3 Ω typical ON-resistance enables near-transparent signal coupling for both analog and digital waveforms without polarity constraints. |
| –2-V undershoot protection | Dedicated sensing circuitry on A/B ports maintains OFF-state isolation even during sub-ground transients, preventing data corruption in hot-swap environments. |
| Ioff partial-power-down support | 10 µA max leakage at VCC = 0 V eliminates back-current paths, allowing safe integration into multi-rail systems with staggered power sequencing. |
| Low I/O capacitance | 5 pF OFF-state capacitance minimizes loading on driving sources and preserves edge rates in high-speed parallel buses and USB signal lines. |
| Mixed-voltage I/O compatibility | 0–5.5 V data I/O range supports direct interfacing with 0.8-V to 5-V logic families, reducing BOM count and PCB area versus discrete level-shifting solutions. |
Applications
| USB 2.0 Data Line Isolation | Legacy Parallel Bus Gating |
|---|---|
|
Use Scenario: Isolating D+ and D– lines between host controller and peripheral during hot-plug detection or power fault recovery. IC Role / Device Role / Timing Role: Dual independent 1-bit switch providing bidirectional, low-distortion signal path with sub-ns propagation delay and –2-V transient immunity. Use Value: Prevents bus lockup during cable insertion/removal by blocking undershoot-induced false logic transitions while maintaining full-speed USB timing compliance. |
Use Scenario: Enabling/disabling address or data lines in microcontroller-based industrial I/O modules with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Two-channel voltage-agnostic bus switch supporting 0.8–5 V signaling levels and independent OE control per channel. Use Value: Eliminates need for separate level translators and reduces layout complexity in modular PLC backplane designs with heterogeneous voltage domains. |
| Analog Sensor Signal Multiplexing | Low-Distortion Audio Switching |
|
Use Scenario: Routing outputs from multiple precision temperature or pressure sensors to a shared ADC input in medical instrumentation. IC Role / Device Role / Timing Role: Low-capacitance, low-ron analog switch with 5 pF Cio(OFF) and 3 Ω ron ensuring minimal gain error and THD degradation. Use Value: Maintains DC accuracy and AC fidelity across sensor channels without requiring calibration compensation for switch-induced offset or bandwidth roll-off. |
Use Scenario: Selecting between line-level audio sources in consumer AV receivers with zero-crossing mute control. IC Role / Device Role / Timing Role: Bidirectional analog gate with rail-to-rail 0–5 V handling, near-zero propagation delay, and low charge injection (<1 pC). Use Value: Enables click/pop-free source switching by synchronizing OE transitions with audio zero crossings, leveraging fast turn-on/turn-off times. |
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 min), higher ron (5 Ω typ), same TSSOP-8 package. | Better suited for mixed 3.3-V/5-V control domains; less optimal for ultra-low-distortion analog paths due to higher ron. | Select SN74CBTD3305PW when OE signals originate from 3.3-V logic and absolute minimum ron is not required. |
| 74LVC1G3157GW | Single SPDT switch, 5-V tolerant I/O, 6 Ω ron, SC-70-6 package, no undershoot protection. | Limited to one channel; lacks –2-V undershoot clamping and Ioff; requires two units for dual-channel function. | Choose 74LVC1G3157GW only for space-constrained single-channel applications where undershoot immunity is not needed. |
Compared with SN74CBT3305CPWR, SN74CBTD3305PW trades marginally higher ON-resistance for broader control-voltage compatibility, while 74LVC1G3157GW sacrifices dual-channel integration, undershoot protection, and Ioff to achieve smaller footprint-making SN74CBT3305CPWR the optimal choice for compact, robust, dual-channel 5-V bus isolation.
Availability
SN74CBT3305CPWR is available at Aetrix Electronics and suitable for USB interface isolation, industrial bus gating, and low-distortion analog multiplexing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74CBT3305CPWR 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 silicon design and manufacturing.
The SN74CBT3305CPWR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital and analog systems where timing integrity and transient resilience are critical.
FAQ
What is the maximum undershoot voltage the SN74CBT3305CPWR can withstand on its A and B ports?
The SN74CBT3305CPWR provides active undershoot protection up to –2 V on both A and B ports, verified per test conditions in the official datasheet (SCDS125B). This protection remains effective regardless of OE state and prevents unintended conduction during negative transients, making SN74CBT3305CPWR suitable for hot-plug interfaces like USB 2.0 where cable-induced undershoot is common.
Does the SN74CBT3305CPWR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3305CPWR supports partial-power-down via its Ioff feature: when VCC = 0 V, leakage current is limited to 10 µA max, preventing back-current flow through the switch. This behavior is intrinsic to the device's FET structure and does not require external circuitry. For reliable high-impedance during power-up/down, tie OE pins to GND via a pulldown resistor-SN74CBT3305CPWR's datasheet specifies minimum resistance based on driver strength.
Can the SN74CBT3305CPWR be used to switch analog signals, and what are its limitations?
Yes, the SN74CBT3305CPWR is widely used for analog signal routing due to its bidirectional operation, 3 Ω typical ron, 5 pF OFF-state capacitance, and rail-to-rail 0–5.5 V I/O range. Limitations include no guaranteed THD or SNR specs, and charge injection (~0.5 pC) may affect high-precision DC-coupled applications. For AC-coupled audio or sensor multiplexing below 10 MHz, SN74CBT3305CPWR delivers excellent linearity and bandwidth without external buffering.
What is the recommended PCB layout practice for minimizing noise coupling on the SN74CBT3305CPWR's VCC and GND pins?
TI recommends placing a 0.1-µF ceramic decoupling capacitor as close as possible between VCC and GND pins of the SN74CBT3305CPWR, using short, wide traces. Avoid routing high-speed signals under or adjacent to the device body. The TSSOP-8 footprint (PW) has exposed thermal pad-TI advises connecting it to a solid GND plane via multiple vias to reduce thermal resistance and improve EMI performance. These practices are detailed in TI's PW0008A package drawing and board layout guidelines.
Is the SN74CBT3305CPWR pin-compatible with other members of the SN74CBT3305x family, such as the SOIC-packaged SN74CBT3305CDR?
Yes, the SN74CBT3305CPWR (TSSOP-8) shares identical pinout and electrical functionality with SN74CBT3305CDR (SOIC-8) and SN74CBT3305CD (SOIC-8 tube). All variants use the same 1OE/1A/1B/GND/VCC/2OE/2B/2A ordering, enabling direct PCB footprint substitution where package height and thermal requirements allow. However, thermal impedance differs (PW: 149°C/W vs D: 97°C/W), so power dissipation must be re-evaluated in high-current applications.
SN74CBT3305CPWR 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:
- Active
- 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
SN74CBT3305CPWR FAQ
1.How can I place an order for SN74CBT3305CPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3305CPWR 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 SN74CBT3305CPWR reliable?
The price and inventory of SN74CBT3305CPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3305CPWR is usually 5 days.
3.What payment methods are accepted for SN74CBT3305CPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3305CPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3305CPWR?
SN74CBT3305CPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3305CPWR 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 SN74CBT3305CPWR?
For technical support, including SN74CBT3305CPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3305CPWR requirements.
6.How does Aetrix verify that SN74CBT3305CPWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3305CPWR 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 SN74CBT3305CPWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3305CPWR?
All SN74CBT3305CPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3305CPWR, 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 SN74CBT3305CPWR part is unused and in its original packaging.
Return procedure for SN74CBT3305CPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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