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Texas Instruments SN74CBTLV3245APW
- Part No.:
- SN74CBTLV3245APW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTLV3245APW.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
SN74CBTLV3245APW from Texas Instruments is a low-voltage octal FET bus switch in TSSOP-20 package, providing bidirectional 8-bit signal routing with 5 Ω on-state resistance, rail-to-rail switching, and Ioff support for partial-power-down operation. It serves as a high-speed isolation switch in data path management for enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3245APW datasheet, SN74CBTLV3245APW pinout, SN74CBTLV3245APW application, or SN74CBTLV3245APW equivalent, key selection criteria include its 2.3–3.6 V supply range, sub-0.25 ns propagation delay, ±2000 V HBM ESD rating, and compatibility with standard '245-type PCB layouts requiring minimal layout changes.
Technical Context
The SN74CBTLV3245APW implements eight independent NMOS FET switches controlled by a single active-low OE input. When OE is low, A1–A8 are electrically connected to B1–B8 with near-zero voltage drop across the channel; when OE is high, both ports enter high-impedance state with <40 µA Ioff leakage at VCC = 0 V.
Its rail-to-rail switching supports logic levels from GND to VCC, enabling interoperability between mixed-voltage domains. The device's Ioff protection prevents backflow current during power sequencing, and its latch-up immunity exceeds 250 mA per JESD17, ensuring robustness in industrial and enterprise environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 2.5 V, 64 mA - enables low-loss signal transmission with <0.32 V drop under full load. |
| Propagation delay (tpd) | 0.15–0.25 ns at VCC = 2.5/3.3 V - supports >1 GHz data rates in high-speed interconnects. |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic families without level translation. |
| Ioff current | <40 µA at VCC = 0 V - ensures safe isolation during partial power-down and hot-swap scenarios. |
| ESD rating (HBM) | ±2000 V - meets JEDEC JS-001 for handling in automated assembly and field-replaceable modules. |
| Operating temperature | –40 °C to +85 °C - qualified for enterprise server, networking, and industrial control ambient conditions. |
| Input capacitance (Ci) | 4 pF - minimizes loading on driving sources and preserves signal integrity in dense PCB layouts. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, 1.2 mm max height, gull-wing leads, exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, NC | No-connect | Internally unconnected; may be tied to GND or left floating without affecting function. |
| 2–9, A1–A8 | Data I/O port A | Bidirectional signal terminals; electrically identical to B-port when switch is enabled. |
| 10, GND | Ground reference | Primary return path for all internal circuitry and switching currents. |
| 11–18, B1–B8 | Data I/O port B | Mirror of A-port; fully interchangeable in signal routing direction. |
| 19, OE | Output Enable (active low) | Controls switch state: low = A↔B connected; high = high-impedance isolation. |
| 20, VCC | Power supply | Single 2.3–3.6 V supply powering all FET channels and control logic. |
Key Features
| Feature | Design Value |
|---|---|
| Standard '245-type pinout | Enables drop-in replacement for legacy 74-series bus switches without PCB redesign. |
| Rail-to-rail switching | Supports full-swing signals from GND to VCC, eliminating need for external biasing in mixed-voltage interfaces. |
| Ioff partial-power-down protection | Prevents damaging back-current flow when VCC is off but A/B ports remain biased, critical for hot-plug systems. |
| Low on-state resistance | 5 Ω typical ensures minimal insertion loss and preserves edge rate in high-speed digital paths up to 1+ GHz. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - guarantees robust operation under transient overvoltage or ground bounce. |
Applications
| Datacenter Server Backplane | Industrial Ethernet Switch |
|---|---|
Use Scenario: Isolating CPU-to-ASIC communication lanes during firmware update or fault recovery. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling dynamic reconfiguration of high-speed parallel data paths. Use Value: Prevents signal contention and bus lockup while maintaining sub-nanosecond timing alignment across 8-bit lanes. |
Use Scenario: Selecting between redundant PHY interfaces in managed Gigabit Ethernet switches. IC Role / Device Role / Timing Role: Signal path selector managing failover between primary and backup MAC-to-PHY links. Use Value: Delivers <0.25 ns skew between lanes and withstands repeated hot-swap cycles without latch-up. |
| Building Automation Controller | Motor Drive I/O Expansion |
Use Scenario: Multiplexing sensor inputs (RS-485, CAN, analog) onto shared MCU ADC or UART pins. IC Role / Device Role / Timing Role: Low-leakage analog/digital multiplexer supporting mixed-signal signal routing. Use Value: 40 µA Ioff ensures sensor bias stability during inactive periods; rail-to-rail operation preserves full-scale accuracy. |
Use Scenario: Isolating encoder feedback lines from motor control logic during power sequencing. IC Role / Device Role / Timing Role: High-speed isolation gate protecting position feedback integrity during startup/shutdown. Use Value: 5 Ω ron minimizes phase error in quadrature encoder signals; ±2000 V HBM protects against drive-stage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245PW | Higher VCC range (4.5–5.5 V), 7 Ω ron, no Ioff support - requires full-power operation. | Only suitable for 5 V legacy systems; cannot replace SN74CBTLV3245APW in 2.5/3.3 V or partial-power-down designs. | Select only if operating exclusively at 5 V and Ioff is unnecessary. |
| SN74LVC2G66DCKR | Single-channel, SC70-6 package, 5.5 Ω ron, same VCC range - lacks octal integration and '245 pinout. | Requires eight discrete devices and custom layout; unsuitable for space-constrained or pin-compatible upgrades. | Use only for low-channel-count prototyping where board area is not constrained. |
Compared with SN74CBT3245PW and SN74LVC2G66DCKR, the SN74CBTLV3245APW uniquely combines octal integration, 2.3–3.6 V operation, Ioff protection, and industry-standard '245 pinout - making it the sole option for compact, low-voltage, hot-swap-capable bus switching.
Availability
SN74CBTLV3245APW is available at Aetrix Electronics and suitable for datacenter server backplanes, industrial Ethernet switches, and building automation controllers requiring stable component supply across multi-year production cycles.
Supply support for SN74CBTLV3245APW 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 solutions, with decades of expertise in high-reliability interface ICs.
The SN74CBTLV3245APW belongs to TI's CBTLV low-voltage bus switch family, engineered for high-speed, low-power signal routing in enterprise infrastructure and industrial communications equipment.
FAQ
What is the maximum operating temperature for the SN74CBTLV3245APW?
The SN74CBTLV3245APW is rated for operation from –40 °C to +85 °C ambient temperature when packaged in the PW (TSSOP-20) variant. This specification is confirmed in Section 4.4 of the official datasheet and applies specifically to DBQ, DGV, DW, PW, and RGY packages. Operation beyond this range may compromise parametric performance and reliability.
Does the SN74CBTLV3245APW support bidirectional signal flow?
Yes, the SN74CBTLV3245APW supports fully bidirectional signal flow between ports A and B. Each of the eight FET switches operates symmetrically - data can pass from A1 to B1 or B1 to A1 with identical on-resistance and timing characteristics, as verified in the functional block diagram and switching characteristics tables of the datasheet.
How does the Ioff feature protect the SN74CBTLV3245APW during power-down?
The Ioff feature limits current to <40 µA when VCC = 0 V and any A or B pin is biased between 0–3.6 V, preventing destructive back-current flow through the FET channel. This behavior is explicitly characterized in Section 4.5 and enables safe partial-power-down operation in systems like hot-swappable line cards where SN74CBTLV3245APW remains powered off while adjacent circuitry stays active.
Is the SN74CBTLV3245APW pin-compatible with older 74-series bus switches?
Yes, the SN74CBTLV3245APW uses the standard '245-type pinout defined in Section 3 of the datasheet, matching pin-for-pin with legacy 74ACT245, 74LCX245, and 74ALVC245 in TSSOP-20 (PW) packaging. This allows direct PCB-level replacement without layout modification, provided supply voltage and timing margins align with the lower-voltage operation of the SN74CBTLV3245APW.
What is the typical on-state resistance of the SN74CBTLV3245APW at 3.3 V supply?
The typical on-state resistance (ron) of the SN74CBTLV3245APW is 5 Ω at VCC = 3.3 V, measured with 64 mA current and VI = 0 V, as specified in Table 4-5 of the datasheet. This value is confirmed across temperature (–40 °C to +85 °C) and ensures minimal voltage drop (<320 mV) and signal distortion in high-speed data paths.
SN74CBTLV3245APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-TSSOP
SN74CBTLV3245APW FAQ
1.How can I place an order for SN74CBTLV3245APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245APW 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 SN74CBTLV3245APW reliable?
The price and inventory of SN74CBTLV3245APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245APW is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3245APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3245APW transactions.
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4.How is shipping managed for SN74CBTLV3245APW?
SN74CBTLV3245APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3245APW 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 SN74CBTLV3245APW?
For technical support, including SN74CBTLV3245APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245APW requirements.
6.How does Aetrix verify that SN74CBTLV3245APW is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245APW 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 SN74CBTLV3245APW meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245APW?
All SN74CBTLV3245APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245APW, 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 SN74CBTLV3245APW part is unused and in its original packaging.
Return procedure for SN74CBTLV3245APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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