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Texas Instruments SN74CBTLV3245DW
- Part No.:
- SN74CBTLV3245DW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTLV3245DW.pdf
- Description:
- IC OCT BUS FET BUS SWITCH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
SN74CBTLV3245 from Texas Instruments is a low-voltage octal FET bus switch in DW package, providing 8-bit bidirectional switching with 5-Ω on-state resistance, <0.25 ns propagation delay at 3.3 V, and isolation under power-off conditions. It operates from 2.3 V to 3.6 V across –40°C to 85°C and is used in high-speed data path isolation for memory expansion and processor interconnects.
For engineers reviewing the SN74CBTLV3245 datasheet, SN74CBTLV3245 pinout, SN74CBTLV3245 application, or SN74CBTLV3245 equivalent, key selection criteria include low on-resistance, rail-to-rail signal pass-through, OE-controlled high-impedance state, and compatibility with standard '245-type PCB layouts.
Technical Context
The SN74CBTLV3245 implements eight independent FET-based transmission gates controlled by a single active-low output enable (OE) input. Its architecture provides true bidirectional signal flow with no internal logic inversion or level translation - signals pass through with minimal distortion and no added latency beyond RC delay.
It features power-off isolation: when VCC = 0 V, leakage current between A and B ports remains ≤30 µA, and all I/O pins tolerate –0.5 V to 4.6 V regardless of supply state. ESD protection exceeds 2000 V (MIL-STD-883) and 200 V (machine model), supporting robust board-level handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 3 V, enabling <10 mV drop at 24 mA - preserves signal integrity in 3.3-V LVTTL/LVCMOS buses |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 3.3 V - supports >1 GHz data rates without timing budget penalty |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5-V and 3.3-V system rails, not 5-V tolerant |
| I/O off-state leakage (Ioff) | 30 µA max at VCC = 0 V - ensures signal isolation during hot-swap or partial power-down |
| Input capacitance (Ci) | 3.5 pF - minimizes capacitive loading on driving sources, critical for fanout-limited buses |
| ESD rating | 2000 V HBM, 200 V machine model - meets industrial handling requirements without external protection |
| Operating temperature | –40°C to +85°C - qualified for commercial and extended industrial ambient environments |
Pinout & Package
SN74CBTLV3245 is supplied in a 20-pin SOIC (DW) package with standard '245-type pinout and one no-connect (NC) pin. The package has 0.65 mm lead pitch, 7.5 mm × 12.8 mm body size, and JEDEC MS-013AC compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 inputs/outputs | Bidirectional port A side - connects directly to source device (e.g., CPU address/data bus) |
| 9 | GND | Power ground reference for switch core and control logic |
| 10, 11, 13, 14, 15, 16, 17, 18 | B1–B8 inputs/outputs | Bidirectional port B side - routes to destination (e.g., peripheral or memory interface) |
| 12 | OE | Active-low output enable - must be pulled up to VCC via external resistor for power-up safety |
| 19 | VCC | Positive supply (2.3–3.6 V) - powers FET channel and OE logic; no internal regulation |
| 20 | NC | No internal connection - left unconnected per TI datasheet; not usable as spare pin |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Enables sub-10-mV voltage drop at 24 mA, preserving noise margins in 3.3-V LVTTL systems |
| Power-off isolation | Maintains ≤30 µA leakage between A/B ports at VCC = 0 V - prevents back-driving during partial power-down |
| Standard '245 pinout | Direct drop-in replacement for legacy 74-series bus switches without PCB redesign |
| 2000-V HBM ESD protection | Eliminates need for external TVS diodes in assembly-line and field-replaceable modules |
| 0.25-ns propagation delay | Supports >1-GHz edge rates in high-speed interconnects without skew-induced setup/hold violations |
Applications
| Memory Expansion Interface | Processor-to-Peripheral Bus Isolation |
|---|---|
|
Use Scenario: Isolating DRAM address/data lines during boot sequence to prevent contention between CPU and memory controller. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling signal paths under OE control with zero propagation delay impact. Use Value: Prevents bus conflicts during reset while maintaining full 3.3-V signal fidelity and <5-Ω path resistance. |
Use Scenario: Separating FPGA configuration bus from active I²C/SPI peripherals during reconfiguration. IC Role / Device Role / Timing Role: OE-gated signal gate that blocks cross-talk and leakage when FPGA is in programming mode. Use Value: Eliminates need for tri-state buffers or complex enable sequencing; achieves <30 µA off-state isolation at 0 V VCC. |
| Hot-Swappable Module Interconnect | Low-Voltage Test Access Port (TAP) Multiplexing |
|
Use Scenario: Enabling safe insertion/removal of daughter cards in 3.3-V backplane systems without powering down main controller. IC Role / Device Role / Timing Role: Signal path isolator that maintains high-impedance state during card insertion until VCC stabilizes. Use Value: Prevents bus contention and latch-up during hot-swap events using inherent power-off isolation behavior. |
Use Scenario: Sharing JTAG TCK/TMS/TDI/TDO lines among multiple ASICs on a test board with shared boundary-scan chain. IC Role / Device Role / Timing Role: Low-capacitance (3.5 pF) bidirectional switch routing TAP signals to selected DUT without signal degradation. Use Value: Maintains IEEE 1149.1 timing compliance with <0.25 ns added delay and no level-shifting artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245DBR | Same function but in SSOP (DB) package; θJA = 115°C/W vs. DW's 97°C/W; identical electrical specs. | Preferred for space-constrained boards where SSOP footprint is acceptable; thermal performance slightly lower. | Select when board layout uses SSOP land pattern or requires tighter pitch than SOIC. |
| SN74LVC245A | Octal transceiver with direction control (DIR) and 3-state outputs - not a passive switch; higher ron (~15 Ω), slower tpd (~5 ns). | Suitable for directional data flow (e.g., UART TX/RX separation); unsuitable for transparent bidirectional paths. | Choose only if direction control is required and low on-resistance or nanosecond delay is not critical. |
Compared with SN74CBT3245DBR and SN74LVC245A, the SN74CBTLV3245 delivers superior signal transparency (5 Ω, 0.25 ns), true bidirectionality without DIR pin, and guaranteed power-off isolation - making it optimal for high-fidelity, low-latency bus gating where timing and leakage matter.
Availability
SN74CBTLV3245 is available at Aetrix Electronics and suitable for memory expansion interfaces, processor-peripheral isolation, hot-swappable module interconnects, and JTAG TAP multiplexing requiring stable component supply and long-term industrial availability.
Supply support for SN74CBTLV3245 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with global manufacturing and quality certification.
The SN74CBTLV3245 belongs to TI's low-voltage CMOS bus switch family, designed specifically for high-speed, low-distortion signal routing in 2.5-V/3.3-V digital systems where passive switching and power-off safety are mandatory.
FAQ
What is the maximum recommended supply voltage for SN74CBTLV3245?
The absolute maximum supply voltage (VCC) for SN74CBTLV3245 is 4.6 V, but the recommended operating range is 2.3 V to 3.6 V. Operating above 3.6 V risks exceeding electrical specifications and may degrade reliability. TI specifies all timing and resistance parameters within the 2.3–3.6 V window, and the SN74CBTLV3245 is not rated for 5-V operation.
Does SN74CBTLV3245 support bidirectional signal flow without direction control?
Yes, SN74CBTLV3245 provides true bidirectional signal pass-through - A1–A8 and B1–B8 are interchangeable ports with no internal direction logic. Unlike transceivers such as SN74LVC245A, the SN74CBTLV3245 requires only OE control and functions identically regardless of signal origin, making it ideal for bus-sharing and hot-swap isolation.
How should the OE pin of SN74CBTLV3245 be handled during power-up?
The OE pin of SN74CBTLV3245 must be tied to VCC through a pullup resistor to ensure high-impedance state at power-on. TI recommends calculating minimum resistance based on driver sink capability; typical values range from 4.7 kΩ to 10 kΩ. Leaving OE floating risks undefined switch state and potential bus contention during startup.
Can SN74CBTLV3245 be used in systems with mixed 2.5-V and 3.3-V logic?
Yes, SN74CBTLV3245 operates across 2.3 V to 3.6 V and tolerates input voltages from –0.5 V to 4.6 V independent of VCC. This allows safe interfacing between 2.5-V and 3.3-V domains without level shifters, provided both sides share common ground and VCC is set to the higher rail (e.g., 3.3 V) to guarantee full drive strength and timing.
Is there a no-connect (NC) pin on SN74CBTLV3245, and how should it be treated?
Yes, Pin 20 is designated NC (no internal connection) in the DW package. It must remain unconnected - neither grounded nor tied to VCC. TI explicitly states this pin has no internal bond wire or circuitry, and connecting it may cause mechanical stress or unintended coupling. The SN74CBTLV3245 datasheet confirms NC functionality applies only to Pin 20 in all supported packages including DW.
SN74CBTLV3245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- FET 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
SN74CBTLV3245DW FAQ
1.How can I place an order for SN74CBTLV3245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3245DW 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 SN74CBTLV3245DW reliable?
The price and inventory of SN74CBTLV3245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3245DW is usually 5 days.
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SN74CBTLV3245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3245DW 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 SN74CBTLV3245DW?
For technical support, including SN74CBTLV3245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3245DW requirements.
6.How does Aetrix verify that SN74CBTLV3245DW is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3245DW 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 SN74CBTLV3245DW meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3245DW?
All SN74CBTLV3245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3245DW, 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 SN74CBTLV3245DW part is unused and in its original packaging.
Return procedure for SN74CBTLV3245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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