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Texas Instruments SN74CBTD3305CPWRE4
- Part No.:
- SN74CBTD3305CPWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTD3305CPWRE4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,383
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Product details
Overview
SN74CBTD3305CPWRE4 from Texas Instruments is a dual 1-bit FET bus switch with integrated level shifting and −2-V undershoot protection, operating from 4.5 V to 5.5 V VCC. It enables bidirectional 5-V-to-3.3-V signal translation, features 3 Ω typical ON-state resistance, <0.15 ns propagation delay, and 5 pF OFF-state I/O capacitance-used in USB interface isolation and memory interleaving.
For engineers reviewing the SN74CBTD3305CPWRE4 datasheet, SN74CBTD3305CPWRE4 pinout, SN74CBTD3305CPWRE4 application, or SN74CBTD3305CPWRE4 equivalent, key selection criteria include undershoot tolerance on A/B ports, Ioff partial-power-down support, TTL/CMOS-compatible control inputs, and TSSOP-8 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBTD3305CPWRE4 implements two independent FET-based transmission gates, each controlled by dedicated OE inputs (1OE, 2OE), enabling per-channel enable/disable. Its internal diode-VCC structure provides passive 5-V-to-3.3-V level shifting without external components.
Active undershoot-protection circuitry monitors A and B port voltages; when undershoot ≤ −2 V is detected, the switch forces OFF-state isolation. The device supports 0–5-V signaling across data I/Os-including 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V logic families-while maintaining Ioff compliance for partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V supply tolerances. |
| ron (Typical) | 3 Ω - Minimizes voltage drop and power loss during signal pass-through at ±128 mA max current. |
| tpd (Max) | 0.15 ns - Enables high-speed digital gating in sub-nanosecond timing-critical paths. |
| Cio(OFF) | 5 pF typical - Reduces capacitive loading and signal distortion on isolated buses. |
| Undershoot Protection | −2 V on A/B ports - Prevents latch-up or damage during transient negative excursions in hot-swap or cable-disconnect scenarios. |
| Ioff | 10 μA at VCC = 0 V - Blocks backflow current during partial power-down, protecting powered subsystems. |
| VI/O Range | 0 V to 5.5 V - Supports mixed-voltage domain interfacing without level-shifter ICs or resistive dividers. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU/SN finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 Output Enable | Active-high control: drives 1A↔1B path ON when high; high-impedance isolation when low. |
| 1A | Channel 1 Data Port A | Bidirectional I/O terminal; accepts 0–5-V signals and interfaces with 3.3-V or lower logic via internal level shift. |
| 1B | Channel 1 Data Port B | Bidirectional I/O terminal; mirrors 1A behavior with identical voltage and undershoot specs. |
| GND | Ground Reference | Common return path for VCC, control, and I/O circuits; required for undershoot clamp diode reference. |
| VCC | Positive Supply | 5-V supply input powering internal FETs, clamp diodes, and undershoot detection circuitry. |
| 2OE | Channel 2 Output Enable | Independent active-high control for second switch channel; enables concurrent or staggered gating. |
| 2B | Channel 2 Data Port B | Second bidirectional I/O; electrically identical to 1B with same Cio(OFF), ron, and VI/O range. |
| 2A | Channel 2 Data Port A | Second bidirectional I/O; supports separate voltage domain bridging from 1A/1B. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1-bit switches | Enables flexible routing: two isolated channels or one coordinated 2-bit path with separate OE control. |
| Integrated 5-V-to-3.3-V level shifting | Eliminates external resistor networks or dedicated translators-reduces BOM count and layout area. |
| −2-V undershoot protection on all I/O ports | Prevents false triggering or silicon damage during hot-plug events in USB or backplane applications. |
| Ioff partial-power-down support | Guarantees isolation between powered and unpowered system domains, meeting JEDEC JESD78 Class II latch-up immunity. |
| Low 5 pF OFF-state I/O capacitance | Maintains signal integrity in high-frequency bus isolation (e.g., DDR address/control lines) with minimal rise-time degradation. |
Applications
| USB Interface Isolation | Memory Interleaving |
|---|---|
|
Use Scenario: Isolating USB 2.0 D+ and D− lines between host controller and peripheral during suspend/resume cycles. IC Role / Device Role / Timing Role: Bidirectional analog switch providing glitch-free signal pass-through with sub-ns timing and −2-V transient tolerance. Use Value: Prevents ground-loop noise coupling and ensures robust hot-plug compliance without added ESD or clamping components. |
Use Scenario: Dynamically routing address/data lines between two DDR SDRAM banks sharing a common controller. IC Role / Device Role / Timing Role: Low-capacitance, low-rON bus gate enabling fast bank switching with no propagation delay penalty. Use Value: Maintains tight setup/hold timing margins while reducing inter-bank crosstalk and signal reflection. |
| Bus Isolation in Mixed-Voltage Systems | Low-Distortion Signal Gating |
|
Use Scenario: Separating 5-V microcontroller GPIOs from 3.3-V sensor interface circuitry in industrial PLC modules. IC Role / Device Role / Timing Role: Level-translating bus switch supporting 0.8–5-V logic families with Ioff-enabled safe power sequencing. Use Value: Eliminates level-shifter ICs and pull-up resistors, simplifying design and improving reliability under brown-out conditions. |
Use Scenario: Enabling/disabling analog audio or clock signals in portable media devices with dynamic power management. IC Role / Device Role / Timing Role: Near-zero-distortion analog switch leveraging FET architecture and 5 pF OFF-state capacitance. Use Value: Preserves signal fidelity in AC-coupled paths with no DC offset or harmonic generation during gating transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244PWR | Octal non-inverting bus switch; no integrated level shifting; 6 Ω ron (typ); 8 pF Cio(OFF). | Lacks −2-V undershoot protection and VCC-diode level shifting; requires external 3.3-V biasing for translation. | Choose when higher channel count is needed and level shifting is handled externally. |
| SN74LVC1G3157DCKR | Single SPDT analog switch; 3.3-V only VCC; 10 Ω ron (typ); 35 pF Cio(OFF); no undershoot protection. | Not rated for 5-V I/O; lacks Ioff and undershoot tolerance; unsuitable for mixed-voltage hot-swap use cases. | Use only in 3.3-V-only signal gating where size and cost outweigh performance requirements. |
Compared with SN74CBTD3305CPWRE4, SN74CBT3244PWR offers more channels but requires external level-shifting infrastructure, while SN74LVC1G3157DCKR sacrifices undershoot resilience, Ioff, and voltage flexibility-making SN74CBTD3305CPWRE4 uniquely suited for robust 5-V/3.3-V boundary management.
Availability
SN74CBTD3305CPWRE4 is available at Aetrix Electronics and suitable for USB interface isolation, memory interleaving, and mixed-voltage bus isolation requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBTD3305CPWRE4 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 IC design and manufacturing.
The SN74CBTD3305CPWRE4 belongs to TI's 74CBT advanced bus switch family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital systems-particularly targeting USB, memory, and industrial interface applications.
FAQ
What is the maximum undershoot voltage the SN74CBTD3305CPWRE4 can withstand on its A and B ports?
The SN74CBTD3305CPWRE4 provides active undershoot protection up to −2 V on both A and B ports, verified per manufacturer test conditions with VCC = 5.5 V and the switch in OFF state. This capability prevents latch-up and ensures reliable operation during hot-plug events or signal transients in USB and backplane applications. The protection is implemented via internal sensing circuitry that forces the switch into high-impedance mode during undershoot events.
Does the SN74CBTD3305CPWRE4 support level shifting from 5 V to 3.3 V without external components?
Yes, the SN74CBTD3305CPWRE4 integrates a diode in series with VCC to enable passive 5-V-to-3.3-V level shifting on data I/Os. When a 5-V signal is applied to the A port, the internal diode drops ~1.7 V, delivering ~3.3 V to the B port-no external resistors, translators, or power supplies are required. This feature is confirmed in the functional description and electrical characteristics section of the official datasheet.
What is the ON-state resistance (ron) specification for the SN74CBTD3305CPWRE4, and how does it affect signal integrity?
The SN74CBTD3305CPWRE4 has a typical ON-state resistance of 3 Ω at VCC = 4.5 V, with a maximum of 6 Ω. This low ron minimizes voltage drop and power dissipation during signal conduction-critical for maintaining logic thresholds and reducing jitter in high-speed digital paths. At ±128 mA max current, the worst-case drop remains under 768 mV, preserving margin for TTL and CMOS-compatible signaling.
Can the SN74CBTD3305CPWRE4 be used in partial-power-down systems?
Yes, the SN74CBTD3305CPWRE4 supports partial-power-down operation via its Ioff feature, which limits leakage to 10 μA when VCC = 0 V. This ensures no damaging back-current flows between powered and unpowered sections of a system-meeting JEDEC JESD78 Class II latch-up immunity requirements. The device maintains high-impedance isolation between A and B ports during power-off states.
What package type and footprint does the SN74CBTD3305CPWRE4 use, and is it compatible with standard PCB assembly processes?
The SN74CBTD3305CPWRE4 uses the TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, with NIPDAU/SN lead finish and MSL Level-1 rating. It is fully compatible with standard reflow soldering (peak 260°C), stencil printing, and automated optical inspection. Board layout guidelines-including land pattern, solder mask, and stencil design-are published by Texas Instruments for reliable manufacturability.
SN74CBTD3305CPWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- 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
SN74CBTD3305CPWRE4 FAQ
1.How can I place an order for SN74CBTD3305CPWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD3305CPWRE4 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 SN74CBTD3305CPWRE4 reliable?
The price and inventory of SN74CBTD3305CPWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3305CPWRE4 is usually 5 days.
3.What payment methods are accepted for SN74CBTD3305CPWRE4?
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4.How is shipping managed for SN74CBTD3305CPWRE4?
SN74CBTD3305CPWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTD3305CPWRE4 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 SN74CBTD3305CPWRE4?
For technical support, including SN74CBTD3305CPWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3305CPWRE4 requirements.
6.How does Aetrix verify that SN74CBTD3305CPWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBTD3305CPWRE4 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 SN74CBTD3305CPWRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBTD3305CPWRE4?
All SN74CBTD3305CPWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3305CPWRE4, 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 SN74CBTD3305CPWRE4 part is unused and in its original packaging.
Return procedure for SN74CBTD3305CPWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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