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Texas Instruments SN74CBTLV3245ADW
- Part No.:
- SN74CBTLV3245ADW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTLV3245ADW.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:557
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Product details
Overview
SN74CBTLV3245ADW from Texas Instruments is a low-voltage octal FET bus switch in SOIC-20 package, providing 8-bit bidirectional signal routing with 5 Ω typical on-state resistance, rail-to-rail switching, and Ioff partial-power-down support. It operates from 2.3 V to 3.6 V and is used for high-speed data path isolation in enterprise computing backplanes and wired networking interfaces.
For engineers reviewing the SN74CBTLV3245ADW datasheet, SN74CBTLV3245ADW pinout, SN74CBTLV3245ADW application, or SN74CBTLV3245ADW equivalent, this page delivers verified technical context, SOIC-20 package mapping, real-world use cases, and validated alternative options for bus switching design validation and BOM optimization.
Technical Context
The SN74CBTLV3245ADW implements an 8-bit single-pole single-throw (SPST) FET switch array with positive-logic active-low output enable (OE). Each A–B channel conducts bidirectionally when OE is low, delivering sub-nanosecond propagation delay (0.15–0.25 ns at VCC = 2.5 V/3.3 V) and <10 Ω maximum on-resistance across its full operating temperature range (–40 °C to +85 °C).
Its Ioff protection limits leakage to ≤40 µA when VCC = 0 V and any I/O is biased 0–3.6 V, enabling safe hot-insertion and partial power-down operation. The device features ESD robustness exceeding ±2000 V HBM and latch-up immunity >250 mA per JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 3.6 V - Enables direct interface with 2.5 V and 3.3 V logic systems without level translation. |
| On-State Resistance (ron) | 5 Ω typical at VCC = 2.5 V, IO = 64 mA - Minimizes voltage drop and signal distortion in high-speed data paths. |
| Propagation Delay (tpd) | 0.15–0.25 ns - Supports >1 GHz signal switching with negligible timing impact in parallel bus architectures. |
| Ioff Leakage | ≤40 µA at VCC = 0 V - Prevents backflow current during system power sequencing or hot-swap events. |
| ESD Rating (HBM) | ±2000 V - Meets industrial-grade electrostatic discharge immunity requirements without external protection. |
| Operating Temperature | –40 °C to +85 °C - Qualified for enterprise server, networking, and industrial control environments. |
| Input Capacitance (Ci) | 4 pF - Reduces capacitive loading on driving sources, preserving signal integrity in dense PCB layouts. |
Pinout & Package
SN74CBTLV3245ADW uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with gull-wing leads and standard 1.27 mm pitch. Thermal performance is characterized by RθJA = 58 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, NC | No-connect | Internally unconnected; may be tied to GND or left floating without functional impact. |
| 2–9, A1–A8 | Data I/O port A | Bidirectional signal terminals; electrically identical to B-side pins and fully interchangeable in routing. |
| 10, GND | Ground reference | Primary return path for switch conduction and supply current; must be low-impedance for noise control. |
| 11–18, B1–B8 | Data I/O port B | Complementary bidirectional port; connects to A-side when OE is asserted low. |
| 19, OE | Output Enable (active low) | Controls all 8 switches simultaneously; requires pull-up to VCC during power-up to ensure high-Z default state. |
| 20, VCC | Power supply | Single 2.3–3.6 V supply powering internal FET gates and logic; bypass capacitor (0.1 µF) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports full 0 V to VCC signal swing on both A and B ports - preserves logic high/low margins across voltage domains. |
| Standard '245-type pinout | Pin-compatible with legacy 74-series octal bus transceivers - enables drop-in replacement in existing SOIC-20 footprints. |
| Ioff partial-power-down | Blocks current flow between powered and unpowered subsystems - eliminates risk of backfeeding during staged power cycling. |
| Low on-state resistance | 5 Ω typical ensures <50 mV voltage drop at 10 mA - maintains signal fidelity in high-speed DDR, PCIe, and parallel bus applications. |
| High-speed propagation | 0.15 ns minimum tpd enables sub-GHz edge rates - critical for maintaining setup/hold timing in synchronous data transfers. |
Applications
| Datacenter Backplane Switching | Industrial Ethernet PHY Isolation |
|---|---|
|
Use Scenario: Isolating redundant CPU-to-I/O hub links in dual-socket server motherboards during failover or firmware update. IC Role / Device Role / Timing Role: Bidirectional 8-bit bus switch enabling hot-swappable link reconfiguration without interrupting adjacent lanes. Use Value: 5 Ω ron and 0.25 ns max tpd preserve signal integrity across 10 GbE backplane traces while supporting seamless handover. |
Use Scenario: Separating PHY-level MDI signals from MAC-side SerDes in modular PLC gateways with field-replaceable modules. IC Role / Device Role / Timing Role: Signal path gate controlled by FPGA GPIO to enable/disable physical layer connectivity on demand. Use Value: Ioff leakage ≤40 µA prevents cross-talk and power leakage between unpowered and active PHY sections. |
| Building Automation Controller Bus Expansion | Motor Drive Digital I/O Multiplexing |
|
Use Scenario: Sharing a single RS-485 transceiver among multiple HVAC controller nodes via time-division multiplexing. IC Role / Device Role / Timing Role: Octal analog switch routing differential pairs and control lines between master MCU and slave peripherals. Use Value: Rail-to-rail operation supports full –7 V to +12 V RS-485 common-mode range when interfaced through level-shifting buffers. |
Use Scenario: Dynamically assigning GPIO pins between encoder feedback capture and PWM output generation in compact servo drives. IC Role / Device Role / Timing Role: Reconfigurable I/O matrix allowing same MCU pins to serve dual functions based on operational mode. Use Value: 2.3 V min VCC compatibility enables direct use with 2.5 V motor control ICs, eliminating auxiliary regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245APW | TSSOP-20 package (6.50 mm × 4.40 mm); RθJA = 105.9 °C/W; identical electrical specs. | Better suited for space-constrained PCBs where SOIC footprint is prohibitive; thermal derating required above 100 mA total load. | Select SN74CBTLV3245APW when board area is limited and thermal management allows higher junction rise. |
| SN74CBTLV3245ARGYR | VQFN-20 package (4.50 mm × 3.50 mm) with exposed thermal pad; RθJA = 80.8 °C/W; rated to +125 °C ambient. | Enables operation in high-temperature motor drive enclosures; requires PCB thermal pad and vias for optimal cooling. | Choose SN74CBTLV3245ARGYR for extended temperature applications where SOIC thermal limits are exceeded. |
Compared with SN74CBTLV3245ADW, the PW variant reduces board area by 60% but increases thermal resistance by 82%, while the RGYR variant adds high-temp capability and superior thermal dissipation at the cost of requiring specialized PCB layout for the thermal pad.
Availability
SN74CBTLV3245ADW is available at Aetrix Electronics and suitable for datacenter backplane switching, industrial Ethernet PHY isolation, and building automation controller bus expansion requiring stable component supply and long-term production continuity.
Supply support for SN74CBTLV3245ADW 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 50 years of innovation in high-reliability interface and signal-path components.
The SN74CBTLV3245ADW belongs to TI's CBTLV low-voltage logic family, engineered for high-speed, low-distortion bus switching in enterprise infrastructure and industrial communications systems.
FAQ
What is the maximum operating temperature for SN74CBTLV3245ADW?
The SN74CBTLV3245ADW is specified for operation from –40 °C to +85 °C ambient temperature. This rating applies specifically to the DW (SOIC-20) package variant and is validated per JEDEC JESD22-A108. Operation beyond +85 °C requires thermal derating analysis using its RθJA = 58 °C/W value and actual board-level dissipation.
Does SN74CBTLV3245ADW support bidirectional signal flow?
Yes, SN74CBTLV3245ADW supports fully bidirectional signal flow between ports A and B. When OE is low, each An–Bn pair forms a low-resistance conductive path with no inherent directionality - signals propagate equally well from A to B or B to A, making it ideal for shared-bus and multiplexer applications.
How should the OE pin be handled during power-up?
The OE pin of SN74CBTLV3245ADW must be held high (via pull-up resistor to VCC) during power-up to ensure the switch remains in high-impedance state until system initialization completes. TI specifies a minimum pull-up resistor value determined by the driver's current-sinking capability; 10 kΩ is commonly used with standard CMOS drivers.
What is the typical on-state resistance of SN74CBTLV3245ADW at 3.3 V supply?
At VCC = 3.3 V, SN74CBTLV3245ADW exhibits a typical on-state resistance (ron) of 5 Ω when IO = 64 mA and VI = 0 V, with a maximum of 7 Ω under those conditions. This value is measured across the A–B channel and directly impacts voltage drop and signal attenuation in high-current data paths.
Can SN74CBTLV3245ADW be used in partial-power-down systems?
Yes, SN74CBTLV3245ADW includes Ioff circuitry that limits leakage current to ≤40 µA when VCC = 0 V and any I/O is biased between 0 V and 3.6 V. This feature enables safe integration into systems with independently powered domains, such as hot-pluggable modules or multi-rail power architectures.
SN74CBTLV3245ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74CBTLV3245ADW FAQ
1.How can I place an order for SN74CBTLV3245ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245ADW 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 SN74CBTLV3245ADW reliable?
The price and inventory of SN74CBTLV3245ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245ADW is usually 5 days.
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SN74CBTLV3245ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3245ADW 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 SN74CBTLV3245ADW?
For technical support, including SN74CBTLV3245ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245ADW requirements.
6.How does Aetrix verify that SN74CBTLV3245ADW is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245ADW 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 SN74CBTLV3245ADW meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245ADW?
All SN74CBTLV3245ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245ADW, 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 SN74CBTLV3245ADW part is unused and in its original packaging.
Return procedure for SN74CBTLV3245ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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