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Texas Instruments SN74CBTLV3245ADWR
- Part No.:
- SN74CBTLV3245ADWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTLV3245ADWR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,770
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Product details
Overview
SN74CBTLV3245ADWR from Texas Instruments is a low-voltage octal FET bus switch in 20-pin TSSOP (PW) package, providing bidirectional 8-bit 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 in enterprise computing backplanes and wired networking data paths where low propagation delay (<0.25 ns) and high isolation are required.
For engineers reviewing the SN74CBTLV3245ADWR datasheet, SN74CBTLV3245ADWR pinout, SN74CBTLV3245ADWR application, or SN74CBTLV3245ADWR equivalent, key selection criteria include guaranteed 5 Ω ron at 2.5 V/3.3 V, −40°C to 85°C operating range for DBQ/DGV/DW/PW/RGY packages, OE-active-low control logic, and compatibility with standard '245-type PCB footprints.
Technical Context
The SN74CBTLV3245ADWR implements eight independent FET-based analog switches in a single-pole double-throw (SPDT) configuration per bit, controlled by a shared active-low output enable (OE) signal. Each switch exhibits rail-to-rail conduction and supports bidirectional signal flow between A and B ports without level translation.
Its Ioff feature ensures sub-40 µA leakage when VCC = 0 V and any I/O is biased between 0–3.6 V, enabling safe partial-power-down operation in mixed-supply systems. The device maintains high-impedance isolation during power-up/down when OE is pulled up to VCC via an external resistor.
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 domains without level shifters. |
| On-State Resistance (ron) | 5 Ω typical at VCC = 2.5 V, IO = 64 mA - Ensures minimal voltage drop and signal attenuation 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 Current | 40 µA max at VCC = 0 V - Prevents backflow current and protects powered-down sections in hot-swap or power-gated systems. |
| ESD Rating (HBM) | ±2000 V - Meets industrial-grade ESD robustness requirements for board-level handling and field operation. |
| Operating Temperature | −40°C to +85°C - Qualified for enterprise computing, networking, and industrial automation environments. |
| Input Capacitance (Ci) | 4 pF - Minimizes capacitive loading on driving sources, preserving signal integrity in high-frequency buses. |
Pinout & Package
SN74CBTLV3245ADWR uses the PW (TSSOP-20) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, 1.2 mm max height, with gull-wing leads and no exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, NC | No-connect | Internally unconnected; may be shorted to GND or left floating without affecting function. |
| 2–9, A1–A8 | Data I/O Port A | Bidirectional signal terminals connected to one side of the 8-bit switch array. |
| 10, GND | Ground | Primary reference for all internal circuitry and I/O voltage levels. |
| 11–18, B1–B8 | Data I/O Port B | Bidirectional signal terminals connected to the opposite side of the 8-bit switch array. |
| 19, OE | Output Enable (active low) | Controls switch state: low = A↔B path enabled; high = high-impedance isolation. |
| 20, VCC | Power Supply | Single supply input for logic and switch operation; must be decoupled with 0.1 µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports full-swing analog/digital signals from GND to VCC without clipping or distortion. |
| Ioff partial-power-down | Enables system-level power gating while maintaining I/O isolation and preventing backfeed currents. |
| Standard '245-type pinout | Direct PCB footprint compatibility with legacy 74-series bus transceivers, simplifying layout reuse. |
| 5 Ω low on-resistance | Minimizes insertion loss and timing skew across all 8 channels in high-speed parallel interfaces. |
| High-impedance OE control | OE must be pulled up to VCC during power transitions to guarantee defined switch state at startup/shutdown. |
Applications
| Datacenter Backplane Switching | Industrial Ethernet PHY Interface |
|---|---|
Use Scenario: Isolating redundant control lines between dual-redundant server management controllers in blade chassis. IC Role / Device Role / Timing Role: Bidirectional signal gate enabling failover path selection without interrupting active traffic. Use Value: 5 Ω ron and <0.25 ns tpd preserve signal integrity across 100 MHz control buses while supporting hot-swap reconfiguration. |
Use Scenario: Multiplexing MDIO/MDC management signals between multiple Ethernet PHYs and a single MAC controller. IC Role / Device Role / Timing Role: Low-latency, direction-agnostic bus switch enabling dynamic PHY selection in multi-port switches. Use Value: Rail-to-rail operation handles 3.3 V MDIO signaling; Ioff prevents cross-talk during PHY power cycling. |
| Building Automation Controller I/O Expansion | Motor Drive Digital Feedback Routing |
Use Scenario: Sharing diagnostic UART and SPI lines among multiple HVAC zone controllers via a central gateway MCU. IC Role / Device Role / Timing Role: Signal path selector allowing time-division multiplexing of serial interfaces without protocol conversion. Use Value: 4 pF Ci minimizes baud-rate degradation; OE-controlled isolation prevents bus contention during firmware updates. |
Use Scenario: Routing encoder quadrature A/B and index signals from multiple servo motors to a shared motion controller ADC input. IC Role / Device Role / Timing Role: Analog-capable digital switch preserving edge timing critical for position feedback accuracy. Use Value: Sub-0.25 ns tpd avoids phase error accumulation; 5 Ω ron prevents duty-cycle distortion in 100 kHz encoder streams. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245APW | Same die, identical electrical specs, identical PW package - only marking difference (no 'D' suffix). | No functional difference; both qualified for −40°C to 85°C operation with same ron/tpd/Ioff. | Select SN74CBTLV3245ADWR when traceability to TI's production lot documentation is required; otherwise interchangeable. |
| SN74CBTLV3245ARGYR | VQFN-20 (RGY) package, 4.5 mm × 3.5 mm, exposed thermal pad, rated for −40°C to 85°C (same as DWR). | Smaller footprint and better thermal performance, but requires PCB redesign for thermal pad soldering and stencil optimization. | Choose SN74CBTLV3245ARGYR for space-constrained designs needing improved power dissipation; avoid if TSSOP footprint reuse is mandatory. |
Compared with SN74CBTLV3245APW and SN74CBTLV3245ARGYR, the SN74CBTLV3245ADWR offers identical switching performance in a mature, widely supported TSSOP package ideal for prototyping and legacy-compatible production, while avoiding the thermal pad assembly complexity of VQFN or marking ambiguity of non-'D' variants.
Availability
SN74CBTLV3245ADWR is available at Aetrix Electronics and suitable for datacenter backplane switching, industrial Ethernet PHY interfacing, and building automation controller I/O expansion requiring stable component supply across multi-year production cycles.
Supply support for SN74CBTLV3245ADWR 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 50 years of innovation in high-reliability industrial and enterprise components.
The SN74CBTLV3245ADWR belongs to TI's CBTLV low-voltage bus switch family, designed specifically for high-speed, low-distortion signal routing in enterprise computing, wired networking, and industrial control infrastructure.
FAQ
What is the maximum operating temperature for SN74CBTLV3245ADWR?
The SN74CBTLV3245ADWR is specified for operation from −40°C to +85°C ambient temperature when packaged in the PW (TSSOP-20) variant. This rating applies to all electrical and switching characteristics in the datasheet's DBQ/DGV/DW/PW/RGY package group, and thermal derating is not required within this range.
Does SN74CBTLV3245ADWR support bidirectional signal flow?
Yes, the SN74CBTLV3245ADWR supports fully bidirectional signal routing between its A and B ports. Each of the eight FET switches conducts equally in either direction when enabled, with no inherent polarity - making it suitable for UART, SPI, and other bidirectional protocols without additional logic.
What is the recommended pull-up resistor value for OE on SN74CBTLV3245ADWR?
Texas Instruments specifies that OE must be tied to VCC through a pullup resistor to maintain high-impedance state during power-up/down. The minimum resistor value depends on the driver's current-sinking capability; for standard CMOS drivers, 4.7 kΩ to 10 kΩ is typical, ensuring OE remains reliably high when inactive while limiting standby current.
Can SN74CBTLV3245ADWR operate at 2.5 V supply?
Yes, the SN74CBTLV3245ADWR is fully specified for 2.5 V operation. Its recommended supply range is 2.3 V to 3.6 V, and key parameters including 5 Ω typical on-resistance and 0.15–0.25 ns propagation delay are explicitly characterized at VCC = 2.5 V ± 0.2 V in the datasheet.
Is SN74CBTLV3245ADWR pin-compatible with older 74-series '245 devices?
The SN74CBTLV3245ADWR uses the standard '245-type pinout, matching pin-for-pin with legacy 74ACT245 and 74LVC245 in the same 20-pin package. However, it is not functionally compatible as a drop-in replacement due to its active-low OE and lack of 3-state output drivers - it is a switch, not a transceiver.
SN74CBTLV3245ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74CBTLV3245ADWR FAQ
1.How can I place an order for SN74CBTLV3245ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245ADWR 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 SN74CBTLV3245ADWR reliable?
The price and inventory of SN74CBTLV3245ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245ADWR is usually 5 days.
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SN74CBTLV3245ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3245ADWR 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 SN74CBTLV3245ADWR?
For technical support, including SN74CBTLV3245ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245ADWR requirements.
6.How does Aetrix verify that SN74CBTLV3245ADWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245ADWR 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 SN74CBTLV3245ADWR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245ADWR?
All SN74CBTLV3245ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245ADWR, 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 SN74CBTLV3245ADWR part is unused and in its original packaging.
Return procedure for SN74CBTLV3245ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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