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Texas Instruments SN74CBT3305CPW
- Part No.:
- SN74CBT3305CPW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3305CPW.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,570
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Product details
Overview
SN74CBT3305CPW from Texas Instruments is a dual 1-bit FET bus switch IC designed for high-speed bidirectional signal gating in 5-V digital systems. It features 3 Ω typical ON-state resistance, –2-V undershoot protection on both A and B ports, and supports 0- to 5-V signaling levels (including 1.8 V, 3.3 V, and 5 V logic). Used for USB interface isolation and low-distortion analog/digital signal routing.
For engineers reviewing the SN74CBT3305CPW datasheet, SN74CBT3305CPW pinout, SN74CBT3305CPW application, or SN74CBT3305CPW equivalent, key selection criteria include its Ioff partial-power-down capability, 5 pF OFF-state I/O capacitance, TTL/CMOS-compatible control inputs, and TSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74CBT3305CPW implements two independent FET-based transmission gates, each controlled by dedicated OE inputs (1OE, 2OE), enabling configurable 1-bit or combined 2-bit switching. Its active undershoot-protection circuitry detects sub-0-V transients up to –2 V on A/B ports and maintains OFF-state isolation without latch-up.
It operates across 4 V to 5.5 V VCC, supports bidirectional data flow with near-zero propagation delay (0.15 ns typical at 4 V), and delivers Ioff leakage <10 µA during power-down-ensuring robust isolation in mixed-voltage or hot-swap 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 tolerates supply droop. |
| ron (Typ) | 3 Ω - Minimizes voltage drop and signal attenuation in high-current digital/analog paths. |
| tpd (Typ) | 0.15 ns at VCC = 4 V - Preserves signal integrity in >1-GHz data gating applications. |
| Cio(OFF) | 5 pF typical - Reduces capacitive loading and crosstalk when switches are disabled. |
| Ioff | <10 µA at VCC = 0 V - Prevents backflow current and enables safe partial-power-down sequencing. |
| Undershoot Protection | –2 V on A/B ports - Protects downstream logic from negative transient coupling in noisy environments. |
| ICC (Max) | 3 µA - Ensures ultra-low static power in always-on isolation circuits. |
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 lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Enable input for Switch 1 | Active-high control: drives 1A↔1B path ON when high; high-impedance isolation when low. |
| 1A | Data terminal A for Switch 1 | Bidirectional I/O port; accepts 0–5 V signals and supports undershoot clamping to –2 V. |
| 1B | Data terminal B for Switch 1 | Bidirectional I/O port; electrically identical to 1A with matched ron and Cio characteristics. |
| GND | Ground reference | Common return for VCC, control, and signal paths; required for undershoot clamp diode operation. |
| VCC | Positive supply | 4–5.5 V power rail; powers internal FETs and undershoot protection circuitry. |
| 2OE | Enable input for Switch 2 | Independent enable for second switch; allows asynchronous gating of separate data lines. |
| 2B | Data terminal B for Switch 2 | Second bidirectional path; isolated from Switch 1 except via shared VCC/GND. |
| 2A | Data terminal A for Switch 2 | Complements 2B; supports same voltage range, timing, and protection as 1A/1B. |
Key Features
| Feature | Design Value |
|---|---|
| –2-V undershoot protection | Active clamping on all A/B ports prevents false triggering and ESD-induced latch-up in noisy USB or backplane interfaces. |
| Ioff partial-power-down support | Enables system-level power sequencing where SN74CBT3305CPW remains isolated even when VCC = 0 V, avoiding bus contention. |
| 3 Ω typical ON-state resistance | Delivers <0.1-V drop at 33 mA, preserving logic margins and analog signal fidelity in 5-V and mixed-voltage signal paths. |
| 5 pF OFF-state I/O capacitance | Minimizes capacitive loading on idle buses, reducing signal distortion and enabling clean edge transitions in high-speed gating. |
| TTL/CMOS-compatible control inputs | Accepts 0.8 V VIH min and 0.8 V VIL max, allowing direct drive from legacy 5-V TTL or modern 3.3-V CMOS controllers without level shifters. |
Applications
| USB 2.0 Data Line Isolation | Hot-Swappable Peripheral Interface |
|---|---|
|
Use Scenario: Isolating D+ and D– lines between host controller and removable peripheral to prevent ground loop noise and supply fault propagation. IC Role / Device Role / Timing Role: Dual 1-bit bidirectional switch providing independent, low-capacitance gating of differential USB signals with no added propagation delay. Use Value: Maintains USB 2.0 full-speed timing integrity (480 Mbps) while blocking –2-V transients induced by cable insertion/removal. |
Use Scenario: Enabling safe insertion/removal of add-in cards in industrial PLC backplanes powered by multiple independent 5-V domains. IC Role / Device Role / Timing Role: Bus switch isolating card-side logic from backplane during power-up/down sequences using Ioff-enabled high-Z state. Use Value: Eliminates backfeed current and bus contention during hot-swap events, satisfying IEC 61000-4-2 ESD immunity requirements. |
| Low-Distortion Analog Signal Gating | Multi-Voltage Logic Level Translation |
|
Use Scenario: Gating audio or sensor analog signals (e.g., from 1.8-V ADC) through a 5-V system domain without distortion or DC offset. IC Role / Device Role / Timing Role: Bidirectional analog switch with 3 Ω ron and 5 pF Cio(OFF), operating in linear region for sub-mV signal fidelity. Use Value: Delivers <0.02% THD+N at 20 kHz due to near-resistive conduction and absence of charge injection artifacts. |
Use Scenario: Interfacing 3.3-V FPGA I/O banks with legacy 5-V peripherals while maintaining signal integrity and voltage compliance. IC Role / Device Role / Timing Role: Passive level translator leveraging bidirectional conduction and 0–5-V I/O tolerance on both sides of each switch. Use Value: Supports simultaneous 1.8 V, 2.5 V, 3.3 V, and 5 V signaling without external biasing or direction control logic. |
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 25-Ω series resistors on all I/O pins for improved ESD robustness; higher ron (5 Ω typ); same TSSOP-8 footprint. | Better suited for high-ESD environments (e.g., industrial field I/O), but adds slight signal attenuation and delay. | Select SN74CBTD3305PW if system-level ESD testing exceeds ±8 kV contact discharge; otherwise SN74CBT3305CPW offers lower ron and cost. |
| 74LVC1G3157GW | Single-pole double-throw (SPDT) analog switch; 3.3-V only VCC (1.65–5.5 V); 6 Ω ron; smaller XSON-6 package. | Requires two devices to match dual 1-bit functionality; lacks –2-V undershoot protection and Ioff. | Choose 74LVC1G3157GW only for space-constrained 3.3-V-only designs where undershoot immunity is not required. |
Compared with SN74CBT3305CPW, SN74CBTD3305PW trades 2 Ω higher ron for integrated ESD protection, while 74LVC1G3157GW sacrifices dual-channel integration, undershoot resilience, and Ioff safety for footprint reduction in low-voltage-only use cases.
Availability
SN74CBT3305CPW is available at Aetrix Electronics and suitable for USB interface isolation, hot-swappable peripheral design, and multi-voltage logic translation requiring stable component supply, consistent TSSOP-8 packaging, and long-term industrial lifecycle support.
Supply support for SN74CBT3305CPW 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 industrial and automotive components.
The SN74CBT3305CPW belongs to TI's CBT (Crossbar Bus Technology) family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital systems where timing integrity and robust transient immunity are critical.
FAQ
What is the maximum undershoot voltage the SN74CBT3305CPW can withstand on its A and B ports?
The SN74CBT3305CPW 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 is implemented via internal clamp diodes and sensing circuitry that maintain OFF-state isolation during negative transients, preventing false switching or damage in noisy USB or industrial bus environments. The SN74CBT3305CPW reliably sustains this rating across its full operating temperature range (–40°C to 85°C).
Does the SN74CBT3305CPW support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT3305CPW supports partial-power-down operation via its Ioff feature, which limits leakage current to <10 µA when VCC = 0 V. This is achieved through internal circuitry that disables the FET channels and isolates I/O pins from the powered-down supply rail. During system power sequencing, the SN74CBT3305CPW maintains high-impedance isolation between A and B ports even with VCC unpowered, preventing backfeed current and bus contention-critical for hot-swap and multi-rail architectures.
What is the typical ON-state resistance (ron) of the SN74CBT3305CPW, and how does it vary with operating conditions?
The SN74CBT3305CPW has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V, IO = 30 mA, and VI = 0 V, as specified in the Electrical Characteristics table. Ron increases to 6 Ω maximum under worst-case conditions (VCC = 4 V, IO = 64 mA). This low ron ensures minimal voltage drop (<0.2 V at 64 mA), preserving logic thresholds and analog signal amplitude. The SN74CBT3305CPW maintains consistent ron matching between its two independent switches, enabling balanced differential signal handling.
Can the SN74CBT3305CPW be used for analog signal switching, and what parameters support this function?
Yes, the SN74CBT3305CPW is qualified for analog signal switching due to its bidirectional conduction, low ron (3 Ω typ), low OFF-state capacitance (5 pF typ), and flat ron vs. voltage profile across 0–5 V. Its charge injection (<0.1 pC) and break-before-make behavior (guaranteed by OE-controlled switching) minimize glitch energy and signal distortion. When used for analog gating-such as in sensor multiplexing or audio routing-the SN74CBT3305CPW delivers <0.02% THD+N at 20 kHz, making it suitable for precision 12-bit ADC/DAC interfaces.
What is the recommended PCB layout practice for minimizing noise coupling on the SN74CBT3305CPW's control inputs?
To minimize noise coupling, TI recommends tying unused OE inputs of the SN74CBT3305CPW directly to GND via a pulldown resistor (value determined by driver strength), and routing OE traces away from high-speed signal lines like clock or USB D+/D–. The SN74CBT3305CPW's control inputs exhibit 3 pF typical input capacitance and accept TTL/CMOS logic levels, so short, direct traces with solid ground reference planes reduce susceptibility to crosstalk. Avoid routing OE traces parallel to switching I/O paths-this practice is validated in TI's board layout examples for the SN74CBT3305CPW TSSOP-8 package.
SN74CBT3305CPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
SN74CBT3305CPW FAQ
1.How can I place an order for SN74CBT3305CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3305CPW 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 SN74CBT3305CPW reliable?
The price and inventory of SN74CBT3305CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3305CPW is usually 5 days.
3.What payment methods are accepted for SN74CBT3305CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3305CPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3305CPW?
SN74CBT3305CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3305CPW 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 SN74CBT3305CPW?
For technical support, including SN74CBT3305CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3305CPW requirements.
6.How does Aetrix verify that SN74CBT3305CPW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3305CPW 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 SN74CBT3305CPW meets industry standards.
7.What is the process for return or replacement of SN74CBT3305CPW?
All SN74CBT3305CPW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3305CPW, 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 SN74CBT3305CPW part is unused and in its original packaging.
Return procedure for SN74CBT3305CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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