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Texas Instruments 74CBTLV3245APWRG4
- Part No.:
- 74CBTLV3245APWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74CBTLV3245APWRG4.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
74CBTLV3245APWRG4 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 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 and wired networking systems.
For engineers reviewing the 74CBTLV3245APWRG4 datasheet, 74CBTLV3245APWRG4 pinout, 74CBTLV3245APWRG4 application, or 74CBTLV3245APWRG4 equivalent, this device delivers sub-nanosecond propagation delay (0.15–0.25 ns), ±2000-V HBM ESD protection, and guaranteed operation from –40°C to +85°C - critical for signal integrity in dense PCB layouts and hot-swap-capable backplanes.
Technical Context
The 74CBTLV3245APWRG4 implements eight independent NMOS pass-gate switches controlled by a single active-low Output Enable (OE) input. When OE is low, A1–A8 are electrically connected to B1–B8 with minimal voltage drop and near-zero propagation delay; 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 compatibility with mixed-voltage interfaces. The Ioff feature prevents backflow current during partial power-down, and the device meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 2.5 V, 64 mA - ensures minimal signal attenuation and voltage drop across switched paths |
| Propagation delay (tpd) | 0.15–0.25 ns - enables GHz-range signal routing without timing degradation |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic domains |
| Ioff leakage current | <40 µA at VCC = 0 V - guarantees isolation and prevents power rail contention during partial power-down |
| ESD rating (HBM) | ±2000 V - meets industrial-grade robustness requirements without external protection |
| Operating temperature | –40°C to +85°C - qualified for enterprise and industrial ambient conditions |
| Input capacitance (Ci) | 4 pF - minimizes loading on driving sources and preserves edge rate |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, exposed thermal pad optional, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, NC | No-connect | Internally unconnected; may be tied to GND or left floating per layout needs |
| 2–9, A1–A8 | Data I/O port A | Bidirectional signal terminals; function as inputs or outputs depending on OE state and system topology |
| 10, GND | Ground reference | Primary return path for switch current and logic control; must be low-impedance |
| 11–18, B1–B8 | Data I/O port B | Mirror of A-port; electrically identical and fully interchangeable in signal routing |
| 19, OE | Output Enable (active low) | Controls switch state: low = A↔B connected; high = high-impedance isolation; requires pullup to VCC during power sequencing |
| 20, VCC | Power supply | Single 2.3–3.6 V supply for logic and switch operation; decoupling capacitor required |
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 level-shifter requirements in mixed-voltage interconnects |
| Ioff partial-power-down | Prevents damaging back-current flow when VCC is off while A/B ports remain biased - essential for hot-swap and modular power architectures |
| 5 Ω low on-resistance | Reduces insertion loss and maintains signal integrity for high-speed digital buses up to 500 Mbps |
| Sub-1 ns enable/disable timing | ten ≤ 4.7 ns and tdis ≤ 6.4 ns at VCC = 3.3 V - enables precise, glitch-free bus arbitration and dynamic reconfiguration |
Applications
| Datacenter Backplane Switching | Industrial Ethernet PHY Interface |
|---|---|
|
Use Scenario: Isolating redundant CPU-to-switch fabric links during failover or firmware update. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling hot-swappable link reconfiguration without interrupting adjacent lanes. Use Value: 5 Ω ron and 0.25 ns tpd preserve signal eye diagram integrity across PCIe Gen2/Gen3 traces; Ioff prevents cross-rail current during partial power cycling. |
Use Scenario: Multiplexing between two Ethernet PHYs sharing a single MAC interface on an industrial controller. IC Role / Device Role / Timing Role: Signal-path selector controlled by FPGA GPIO to route 100BASE-TX differential pairs. Use Value: Rail-to-rail operation supports 2.5 V and 3.3 V PHY signaling; ±2000 V HBM withstands factory ESD events during board assembly. |
| Building Automation Controller Bus Expansion | Motor Drive Communication Isolation |
|
Use Scenario: Adding isolated RS-485 transceiver banks to a central HVAC controller via shared UART lines. IC Role / Device Role / Timing Role: Low-latency bus switch enabling time-multiplexed access to multiple transceivers from one UART TX/RX pair. Use Value: 4 pF input capacitance avoids baud-rate limiting on 115.2 kbps links; TSSOP-20 footprint fits space-constrained DIN-rail mount designs. |
Use Scenario: Isolating CAN FD or SPI debug interfaces from motor gate driver ICs during overcurrent fault recovery. IC Role / Device Role / Timing Role: Signal path gate that disconnects debug lines when gate drivers enter safe-state shutdown. Use Value: Sub-5 ns enable/disable timing synchronizes cleanly with PWM dead-time controllers; –40°C to +85°C rating matches drive-stage thermal envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245APW | Same die, identical electrical specs, but non-G4 suffix - lacks enhanced moisture sensitivity level (MSL) and tape-and-reel packaging per TI's G4 standard | Not qualified for high-humidity reflow environments requiring MSL1 handling; unsuitable for automated SMT lines with extended floor life requirements | Select 74CBTLV3245APWRG4 when MSL1 compliance, extended storage stability, or TI's enhanced quality screening are required. |
| 74LVC245APW | Higher ron (15–25 Ω), slower tpd (2.5–4.5 ns), no Ioff support, and lower ESD rating (±2000 V HBM but no JESD 17 latch-up spec) | Limited to low-speed, non-hot-swap applications; cannot replace 74CBTLV3245APWRG4 in partial-power-down or high-reliability contexts | Use only if cost sensitivity outweighs performance, reliability, and power-management requirements - not a functional substitute. |
Compared with SN74CBTLV3245APW and 74LVC245APW, the 74CBTLV3245APWRG4 uniquely combines ultra-low on-resistance, sub-nanosecond timing, Ioff-enabled power sequencing, and full industrial qualification - making it the sole choice for high-density, hot-swap-capable, and thermally demanding bus switching.
Availability
74CBTLV3245APWRG4 is available at Aetrix Electronics and suitable for datacenter backplane switching, industrial Ethernet PHY interfacing, and building automation controller bus expansion requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 74CBTLV3245APWRG4 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 logic and interface ICs.
The SN74CBTLV family was designed specifically for low-voltage, high-speed bus switching in enterprise infrastructure and industrial control systems where signal integrity, power sequencing, and robustness are critical.
FAQ
What is the maximum operating temperature for the 74CBTLV3245APWRG4?
The 74CBTLV3245APWRG4 is specified for operation from –40°C to +85°C ambient temperature when packaged in the TSSOP-20 (PW) variant. This range is validated per JEDEC JESD22-A104 and applies to all electrical and switching characteristics in the official datasheet. Operation beyond +85°C is not characterized and may result in parametric shift or reliability risk.
Does the 74CBTLV3245APWRG4 support bidirectional signal flow?
Yes, the 74CBTLV3245APWRG4 supports fully bidirectional signal routing between ports A and B. Each of the eight FET switches conducts equally in either direction when enabled, with identical on-resistance and timing characteristics regardless of signal direction - confirmed in the device's simplified schematic and functional truth table.
How should the OE pin be handled during power-up to ensure reliable operation of the 74CBTLV3245APWRG4?
The OE pin of the 74CBTLV3245APWRG4 must be held high (i.e., pulled to VCC) via a pullup resistor during power-up and power-down to maintain high-impedance isolation until system control logic asserts a valid low-level enable. TI specifies a minimum pullup resistor value based on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ.
Is the 74CBTLV3245APWRG4 pin-compatible with older 74-series bus switches?
Yes, the 74CBTLV3245APWRG4 uses the standard '245-type pinout defined in JEDEC MS-012, matching pin-for-pin with industry-standard octal bus transceivers like the 74LS245 and 74LVC245. This allows direct mechanical and layout compatibility in existing designs without PCB revision.
What is the purpose of the NC (no-connect) pin on the 74CBTLV3245APWRG4?
Pin 1 of the 74CBTLV3245APWRG4 is designated NC (no internal connection). It has no electrical function and may be left floating, tied to GND, or connected to a ground plane for mechanical stability - all options are acceptable per TI's datasheet guidance and do not affect device operation or reliability.
74CBTLV3245APWRG4 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:
- Discontinued at Digi-Key
- 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
74CBTLV3245APWRG4 FAQ
1.How can I place an order for 74CBTLV3245APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTLV3245APWRG4 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 74CBTLV3245APWRG4 reliable?
The price and inventory of 74CBTLV3245APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3245APWRG4 is usually 5 days.
3.What payment methods are accepted for 74CBTLV3245APWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3245APWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CBTLV3245APWRG4?
74CBTLV3245APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTLV3245APWRG4 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 74CBTLV3245APWRG4?
For technical support, including 74CBTLV3245APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3245APWRG4 requirements.
6.How does Aetrix verify that 74CBTLV3245APWRG4 is sourced from the original manufacturer or authorized distributors?
All 74CBTLV3245APWRG4 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 74CBTLV3245APWRG4 meets industry standards.
7.What is the process for return or replacement of 74CBTLV3245APWRG4?
All 74CBTLV3245APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3245APWRG4, 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 74CBTLV3245APWRG4 part is unused and in its original packaging.
Return procedure for 74CBTLV3245APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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