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Texas Instruments SN74CBTLV3245APWR
- Part No.:
- SN74CBTLV3245APWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTLV3245APWR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:22,524
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Product details
Overview
SN74CBTLV3245APWR from Texas Instruments is a low-voltage octal FET bus switch in TSSOP-20 package, providing bidirectional 8-bit signal routing with 5 Ω typical 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 SN74CBTLV3245APWR datasheet, SN74CBTLV3245APWR pinout, SN74CBTLV3245APWR application, or SN74CBTLV3245APWR equivalent, key selection criteria include guaranteed 5 Ω ron at 2.3–3.6 V supply, <0.25 ns propagation delay, Ioff leakage ≤40 µA during power-off, and compatibility with standard '245-type PCB layouts.
Technical Context
The SN74CBTLV3245APWR implements eight independent NMOS pass-gate switches controlled by a single active-low OE input. Each switch exhibits rail-to-rail conduction with no level-shifting, enabling seamless interface between mixed-voltage domains (e.g., 2.5 V and 3.3 V logic).
Its Ioff feature actively blocks current backflow when VCC = 0 V and any I/O is biased 0–3.6 V, ensuring system-level isolation during hot-swap or partial power-down sequences. The device operates across –40°C to +85°C for DBQ/DGV/DW/PW/RGY packages, with thermal resistance RθJA = 105.9°C/W in PW (TSSOP-20) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 2.3 V, 64 mA - ensures minimal voltage drop and signal distortion in high-speed data paths |
| Propagation delay (tpd) | 0.15–0.25 ns at VCC = 2.5 V or 3.3 V - supports >1 GHz signal switching without timing degradation |
| Supply voltage range | 2.3 V to 3.6 V - compatible with modern low-voltage I/O standards including LVTTL and LVCMOS |
| Ioff leakage current | ≤40 µA at VCC = 0 V - prevents damaging back-current during partial power-down or hot-insertion |
| ESD rating (HBM) | ±2000 V - meets JEDEC JESD22-A114 requirement for robust handling in automated assembly |
| Operating temperature | –40°C to +85°C - qualified for industrial and enterprise-grade environmental conditions |
| Input capacitance (Ci) | 4 pF - minimizes loading on driving circuits and preserves signal edge integrity |
Pinout & Package
PW package: 20-pin Thin Shrink Small Outline Package (TSSOP), 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, 1.2 mm max height, 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-side pins with no directionality constraint |
| 10, GND | Ground reference | Primary return path for all internal circuitry and switch current; must be low-impedance |
| 11–18, B1–B8 | Data I/O port B | Complementary bidirectional port; connected to A-port when OE is low |
| 19, OE | Output Enable (active low) | Controls switch state: low = A↔B connected; high = high-impedance isolation between ports |
| 20, VCC | Power supply | Single 2.3–3.6 V supply for logic control and switch bias; requires local 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports full-swing signals from GND to VCC without clipping or threshold loss |
| Standard '245-type pinout | Enables drop-in replacement of legacy 74-series bus switches without PCB redesign |
| Ioff partial-power-down protection | Prevents reverse current flow when VCC = 0 V and I/O pins are externally biased |
| Low on-state resistance | 5 Ω typical ensures <50 mV voltage drop at 10 mA, preserving signal integrity in impedance-sensitive paths |
| Latch-up immunity | Exceeds 250 mA per JESD17 - eliminates risk of destructive latch-up under transient overvoltage |
Applications
| Datacenter Interconnect | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Isolating PCIe or DDR memory address/data buses during firmware updates or hot-swap events. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling dynamic reconfiguration of shared memory channels without signal contention. Use Value: Eliminates need for external series resistors or complex arbitration logic while maintaining sub-nanosecond timing margins. |
Use Scenario: Routing encoder feedback signals between multiple motor controllers and a central motion processor. IC Role / Device Role / Timing Role: Low-latency signal path selector that preserves quadrature phase relationship and edge fidelity. Use Value: 0.25 ns max tpd prevents phase skew accumulation across multi-axis synchronized drives. |
| Building Automation Network Hub | Wired Networking PHY Interface |
|
Use Scenario: Multiplexing RS-485 transceiver lines across multiple HVAC controller nodes sharing a common backbone. IC Role / Device Role / Timing Role: Signal path isolator preventing ground loop currents and bus contention during node initialization. Use Value: Ioff ≤40 µA guarantees zero leakage-induced false triggering when transceivers power up asynchronously. |
Use Scenario: Switching MDI/MDI-X configuration on Ethernet PHYs to auto-negotiate crossover vs. straight-through cable connections. IC Role / Device Role / Timing Role: High-speed differential pair selector operating within IEEE 802.3 timing budgets. Use Value: 5 Ω ron introduces <0.1 dB insertion loss at 100 MHz, meeting Ethernet channel compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245PWR | Higher ron (12 Ω typical), no Ioff, rated only to 70°C ambient | Not suitable for partial-power-down or extended temperature environments | Select SN74CBTLV3245APWR where hot-swap capability or industrial temperature range is required |
| 74LVC245APW | Octal buffer with 3-state outputs, not a true analog switch; higher propagation delay (>3 ns) | Cannot provide rail-to-rail analog switching or bidirectional signal routing | Choose SN74CBTLV3245APWR when signal path isolation, low latency, or voltage-domain bridging is needed |
Compared with SN74CBT3245PWR and 74LVC245APW, the SN74CBTLV3245APWR uniquely delivers sub-nanosecond switching, Ioff-enabled power sequencing, and true bidirectional analog conduction-making it the only option for high-fidelity, low-latency bus isolation in modern low-voltage systems.
Availability
SN74CBTLV3245APWR is available at Aetrix Electronics and suitable for datacenter interconnect, industrial motor drive control, and building automation systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74CBTLV3245APWR 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 IC design.
The SN74CBTLV3245APWR belongs to TI's CBTLV family of low-voltage FET bus switches, engineered specifically for high-speed, low-distortion signal routing in enterprise infrastructure and industrial control applications.
FAQ
What is the maximum operating frequency supported by the SN74CBTLV3245APWR?
The SN74CBTLV3245APWR does not specify a maximum clock frequency but supports signal switching with <0.25 ns propagation delay and <9 pF off-state capacitance, enabling reliable operation beyond 1 GHz in well-terminated transmission lines. Its performance is governed by board layout, load capacitance, and drive strength-not an internal clock.
Does the SN74CBTLV3245APWR require external pull-up resistors on the OE pin?
Yes - to ensure a defined high-impedance state during power-up or power-down, OE must be pulled up to VCC via an external resistor. TI recommends a value determined by the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ for robust noise immunity and fast disable timing.
Can the SN74CBTLV3245APWR interface between 2.5 V and 3.3 V logic domains?
Yes - the SN74CBTLV3245APWR supports rail-to-rail switching and operates across 2.3 V to 3.6 V, allowing direct connection between 2.5 V and 3.3 V I/Os without level shifters. Both A and B ports tolerate voltages from GND to VCC, preserving signal swing and timing integrity across mixed-voltage systems.
Is the SN74CBTLV3245APWR pin-compatible with older 74-series bus switches?
Yes - the SN74CBTLV3245APWR uses the standard '245-type pinout (A1–A8, OE, B1–B8, GND, VCC), enabling mechanical and layout compatibility with legacy 74ACT245, 74LVC245, and similar devices in TSSOP-20 footprint, though electrical behavior differs due to FET-switch architecture.
What thermal considerations apply to the SN74CBTLV3245APWR in continuous operation?
The SN74CBTLV3245APWR in PW (TSSOP-20) package has RθJA = 105.9°C/W. At 3.6 V and full 8-bit conduction with 64 mA per channel, total power dissipation remains below 20 mW, resulting in negligible junction temperature rise (<2°C above ambient) with standard PCB copper pour - no heatsink required.
SN74CBTLV3245APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74CBTLV3245APWR FAQ
1.How can I place an order for SN74CBTLV3245APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245APWR 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 SN74CBTLV3245APWR reliable?
The price and inventory of SN74CBTLV3245APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245APWR is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3245APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3245APWR transactions.
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4.How is shipping managed for SN74CBTLV3245APWR?
SN74CBTLV3245APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3245APWR 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 SN74CBTLV3245APWR?
For technical support, including SN74CBTLV3245APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245APWR requirements.
6.How does Aetrix verify that SN74CBTLV3245APWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245APWR 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 SN74CBTLV3245APWR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245APWR?
All SN74CBTLV3245APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245APWR, 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 SN74CBTLV3245APWR part is unused and in its original packaging.
Return procedure for SN74CBTLV3245APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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