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Texas Instruments SN74CB3T3245DWRG4
- Part No.:
- SN74CB3T3245DWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CB3T3245DWRG4.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,890
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Product details
Overview
SN74CB3T3245DWRG4 from Texas Instruments is an 8-bit FET bus switch with bidirectional data flow, 5V-tolerant I/Os, and VCC-tracked level shifting (2.5V/3.3V operation). It delivers near-zero propagation delay (0.25 ns at 3.3V), 5Ω typical ON-state resistance, and 5pF OFF-state I/O capacitance for high-speed mixed-mode signal routing in voltage-translating interfaces.
For engineers reviewing the SN74CB3T3245DWRG4 datasheet, SN74CB3T3245DWRG4 pinout, SN74CB3T3245DWRG4 application, or SN74CB3T3245DWRG4 equivalent, this device serves as a low-power, TTL-compatible bus isolator supporting 0–5V signaling across 2.3–3.6V VCC, with Ioff-enabled partial-power-down capability and robust ESD protection (2000V HBM).
Technical Context
The SN74CB3T3245DWRG4 implements eight independent FET-based analog switches controlled by a single active-low OE input, enabling or disabling bidirectional A↔B port connectivity. Its output voltage translation directly tracks VCC, allowing down-shifting from 5V/3.3V inputs to 3.3V/2.5V outputs without external components.
Each switch features undershoot clamp diodes on data and control inputs, supports mixed-mode operation across 0.8V–5V logic families, and maintains 5V tolerance regardless of power state-enabling hot-insertion and safe I/O isolation during system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables operation in both 2.5V and 3.3V systems with margin for supply variation. |
| ron (Typical) | 5Ω - Minimizes voltage drop and signal distortion under 32mA load, critical for integrity in high-speed buses. |
| Cio(OFF) | 5pF - Reduces capacitive loading on upstream drivers and prevents signal degradation in fan-out scenarios. |
| Propagation Delay | 0.25ns at 3.3V - Enables sub-nanosecond timing budgets for PCIe, USB, and memory interleave applications. |
| Ioff Current | 10µA - Blocks backflow current during partial power-down, protecting unpowered subsystems from damage. |
| ESD Rating | ±2000V HBM - Meets Class II human-body model requirements for reliable handling in manufacturing and field service. |
| Signal Range | 0V to 5.5V - Supports interoperability across 0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V logic families without level-shifter ICs. |
Pinout & Package
SN74CB3T3245DWRG4 uses a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm, with standard '245-type pinout and no internal connection on Pin 1 (NC). The package supports surface-mount reflow per Level-1 MSL rating and features NIPDAU lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No internal connection | Unused pad; must be left floating or tied to GND/VCC per layout best practice-no electrical function. |
| 2–9 A1–A8 | Switch input terminals (Port A) | Bidirectional data inputs/outputs connected to one side of the FET switch array; 5V-tolerant. |
| 10 GND | Ground reference | Primary return path for VCC and all I/O signals; requires low-inductance PCB connection. |
| 11–18 B1–B8 | Switch output terminals (Port B) | Bidirectional data inputs/outputs connected to opposite side of FET array; voltage level tracks VCC. |
| 19 OE | Active-low output enable | Controls global switch state: low = A↔B conductive; high = high-impedance isolation between ports. |
| 20 VCC | Power supply | Supplies gate drive and bias for all eight FETs; requires local 0.1µF bypass capacitor per TI recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Output voltage translation | Tracks VCC precisely-enables deterministic 5V→3.3V or 5V/3.3V→2.5V down-shifting without external resistors or regulators. |
| Mixed-mode signal support | Simultaneous 0.8V–5V signaling on all I/Os-eliminates need for discrete level translators in heterogeneous logic systems. |
| 5V-tolerant I/Os | Operational with VI/O up to 7V regardless of VCC state-supports hot-plug, legacy 5V peripheral interfacing, and safe power sequencing. |
| Ioff partial-power-down | Blocks >99% of backflow current when VCC = 0V-prevents damage to powered-down sections in multi-rail embedded systems. |
| Low ON-state resistance | 5Ω typical at 2.5V VCC-preserves signal edge rate and reduces insertion loss in high-frequency data paths (e.g., USB 2.0, PCI). |
Applications
| PCI Interface | USB 2.0 Data Isolation |
|---|---|
Use Scenario: Isolating 3.3V PCI slot from 5V legacy controller while maintaining signal integrity across 33MHz bus. IC Role / Device Role / Timing Role: Bidirectional bus switch providing VCC-tracked level translation and sub-ns propagation delay for synchronous data transfer. Use Value: Eliminates external pull-up networks and discrete translators; enables direct interface without timing budget penalty or signal reflection. | Use Scenario: Separating USB 2.0 D+/D− lines between 3.3V host controller and 5V peripheral during suspend/resume cycles. IC Role / Device Role / Timing Role: Hot-swap-capable isolator with Ioff and 5V-tolerant I/Os ensuring safe voltage domain bridging during power transitions. Use Value: Prevents backfeed into unpowered USB PHY; maintains <5pF loading to preserve 480Mbps eye diagram compliance. |
| Memory Interleaving | Low-Power Portable Bus Control |
Use Scenario: Routing address/data between 2.5V DDR2 memory controller and 3.3V I/O expander in battery-powered industrial handheld. IC Role / Device Role / Timing Role: Low-ron, low-capacitance switch enabling glitch-free address latching and data forwarding across voltage domains. Use Value: Reduces dynamic power by 30% vs. traditional buffer-based solutions; supports 2.3V minimum VCC for extended battery life. | Use Scenario: Enabling/disabling sensor bus segments in wearable health monitor to minimize standby current. IC Role / Device Role / Timing Role: Power-gated bus isolator with 40µA max ICC and Ioff-cuts leakage to µA-level when sensors are inactive. Use Value: Extends battery runtime by eliminating static current paths; allows firmware-controlled segment activation without hardware redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245CPWRE4 | Higher ron (7Ω typ), 3.3V-only VCC range (3.0–3.6V), no 2.5V support | Limited to 3.3V systems; lacks 2.5V down-shift capability and wider VCC margin | Select when only 3.3V operation is required and cost sensitivity outweighs 2.5V flexibility. |
| SN74LVC245APWRE4 | Direction-controlled (non-bidirectional), higher propagation delay (3.5ns), no VCC-tracking translation | Requires external level shifters for mixed-voltage use; unsuitable for true bidirectional bus isolation | Choose only for unidirectional 3.3V↔3.3V buffering where translation is handled elsewhere. |
Compared with SN74CB3T3245DWRG4, SN74CBT3245CPWRE4 sacrifices 2.5V compatibility and adds 40% ron penalty, while SN74LVC245APWRE4 abandons bidirectionality and voltage tracking-making SN74CB3T3245DWRG4 uniquely suited for compact, low-latency, mixed-voltage bus switching.
Availability
SN74CB3T3245DWRG4 is available at Aetrix Electronics and suitable for PCI interface design, USB 2.0 isolation, and memory interleaving applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SN74CB3T3245DWRG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
SN74CB3T3245DWRG4 belongs to TI's CB3T bus switch family, engineered for low-power, high-speed voltage translation and bidirectional isolation in portable and mixed-voltage digital systems.
FAQ
What is the maximum allowable input voltage on the I/O pins of SN74CB3T3245DWRG4?
The SN74CB3T3245DWRG4 supports VI/O up to 7V regardless of VCC state-verified per Absolute Maximum Ratings. This 5V-tolerant behavior enables safe interfacing with legacy 5V peripherals and hot-plug operation even when the device is unpowered, with clamp diodes limiting overshoot/undershoot.
Does SN74CB3T3245DWRG4 support true bidirectional data flow without direction control pins?
Yes, SN74CB3T3245DWRG4 provides fully bidirectional A↔B signal routing through a single OE pin-no DIR pin required. When OE is low, all eight channels conduct equally in either direction with matched 5Ω ron, enabling seamless data exchange in protocols like I²C, SMBus, and shared-memory buses.
How does the VCC-tracking level shifting work in SN74CB3T3245DWRG4?
In SN74CB3T3245DWRG4, output voltage levels track VCC directly: with 2.5V VCC, 5V inputs translate to ~2.5V outputs; with 3.3V VCC, same inputs yield ~3.3V outputs. This is achieved via FET gate biasing that ties VO to VCC-not a regulated LDO-ensuring deterministic, low-latency translation without external components.
What is the thermal performance of SN74CB3T3245DWRG4 in its SOIC (DW) package?
SN74CB3T3245DWRG4 in the DW package has a junction-to-ambient thermal resistance (RθJA) of 58°C/W. At 40µA ICC and 3.3V VCC, self-heating is negligible (<0.1°C rise), making it suitable for thermally constrained PCB layouts without heatsinking-even in stacked or enclosed industrial enclosures.
Can SN74CB3T3245DWRG4 be used in partial-power-down systems?
Yes, SN74CB3T3245DWRG4 incorporates Ioff circuitry that limits current to 10µA when VCC = 0V, preventing damaging backflow from live I/Os into unpowered sections. This meets JESD78 latch-up immunity and enables safe use in multi-rail systems undergoing staggered power sequencing.
SN74CB3T3245DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74CB3T3245DWRG4 FAQ
1.How can I place an order for SN74CB3T3245DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3245DWRG4 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 SN74CB3T3245DWRG4 reliable?
The price and inventory of SN74CB3T3245DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3245DWRG4 is usually 5 days.
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Once your SN74CB3T3245DWRG4 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 SN74CB3T3245DWRG4?
For technical support, including SN74CB3T3245DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3245DWRG4 requirements.
6.How does Aetrix verify that SN74CB3T3245DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3245DWRG4 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 SN74CB3T3245DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CB3T3245DWRG4?
All SN74CB3T3245DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3245DWRG4, 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 SN74CB3T3245DWRG4 part is unused and in its original packaging.
Return procedure for SN74CB3T3245DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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