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Texas Instruments SN74LVTH245APWR
- Part No.:
- SN74LVTH245APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH245APWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
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Product details
Overview
SN74LVTH245APWR from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V systems. It supports mixed-mode signal operation, provides bus-hold on all data inputs, and features Ioff and power-up 3-state for hot insertion in industrial backplanes and embedded controllers.
For engineers reviewing the SN74LVTH245APWR datasheet, SN74LVTH245APWR pinout, SN74LVTH245APWR application, or SN74LVTH245APWR equivalent, key selection criteria include its 20-pin TSSOP package, 3.3-V VCC operation with 5-V tolerant inputs/outputs, ±100 µA Ioff, 32 mA IOL at 3 V, and tPLH/tPHL ≤ 3.5 ns (VCC = 3.3 V).
Technical Context
This device implements an ABT (Advanced BiCMOS Technology) architecture optimized for low-voltage, high-speed bus interfacing. Its DIR input controls data direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state - critical for bus arbitration in multi-master systems.
The integrated bus-hold circuitry actively maintains valid logic levels on floating A/B port inputs without external resistors, and the Ioff specification ensures no current backflow during power-down, satisfying hot-swap requirements in modular computing and telecom line cards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V in portable instrumentation. |
| IOL / IOH | 64 mA / −32 mA at VCC = 3 V - drives standard TTL loads directly without level-shifting buffers. |
| tPLH / tPHL | ≤ 3.5 ns at VCC = 3.3 V, CL = 50 pF - enables reliable 100+ MHz bus clocking in FPGA-to-ASIC interconnects. |
| VIH / VIL | 2.0 V / 0.8 V - compatible with both 3.3-V LVTTL and 5-V TTL logic thresholds. |
| Ioff | ±100 µA at VCC = 0 - prevents damaging back-current during live insertion of daughterboards. |
| Bus-Hold Current | ±750 µA (dynamic hold) - eliminates need for 10-kΩ pullup/pulldown resistors on unused data lines. |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-grade robustness per JESD22-A114/A115. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, exposed thermal pad optional for enhanced thermal dissipation (θJA = 83°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Port A bidirectional data terminals; internally bus-held when floating. |
| 9 | DIR | Direction control: LOW = B→A, HIGH = A→B; must be driven to VCC or GND. |
| 10 | GND | Ground reference for all logic and output stages. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Inputs/Outputs | Port B bidirectional data terminals; bus-held like A-port. |
| 19 | OE | Output enable: LOW = active drive, HIGH = 3-state isolation; tied to VCC via pullup for power-up safety. |
| 20 | VCC | 3.3-V supply input; decoupling capacitor required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode interface | 5-V tolerant inputs/outputs with 3.3-V VCC - eliminates external level shifters in legacy system upgrades. |
| Hot-insertion support | Ioff + power-up 3-state - enables safe field replacement of modules without powering down the entire chassis. |
| Integrated bus-hold | Active clamping on all 16 data pins - removes 16 external resistors, saving PCB area and BOM cost. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - reduces noise coupling into adjacent analog or RF sections. |
| Latch-up immunity | Exceeds 500 mA per JESD17 - ensures reliability in high-noise industrial motor-control environments. |
Applications
| Industrial Backplane Interface | FPGA-to-Microcontroller Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a 5-V microcontroller-based control module in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver enabling synchronous data exchange across voltage domains. Use Value: Eliminates discrete level-shifters and pull-up networks, reducing component count by ≥5 parts per interface channel. | Use Scenario: Connecting an ARM Cortex-M4 MCU's GPIO port to an FPGA configuration memory bus during boot-time initialization. IC Role / Device Role / Timing Role: Controlled-direction data conduit with OE-gated isolation during reset sequencing. Use Value: Prevents bus contention during power-up; tPLZ/tPZL ≤ 7.1 ns ensures deterministic timing alignment with 50-MHz configuration clocks. |
| Modular Telecom Line Card | Automated Test Equipment (ATE) |
Use Scenario: Hot-swappable line card in a carrier-grade switch, where data buses must remain isolated during insertion/removal. IC Role / Device Role / Timing Role: Isolation gate with Ioff-enabled power-down protection and bus-hold retention of last valid state. Use Value: Enables zero-downtime maintenance; ±100 µA Ioff prevents backfeed into powered-backplane rails. | Use Scenario: Signal routing between 3.3-V digital pattern generator and 5-V DUT (device under test) in boundary-scan test fixtures. IC Role / Device Role / Timing Role: Programmable-direction bus buffer synchronized to test clock edges. Use Value: 3.5 ns propagation delay supports >100 MHz test vector rates; 20-pin TSSOP fits high-density probe card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive strength (24 mA IOL), no bus-hold, 1.65–3.6 V VCC range. | Suitable only for pure 3.3-V systems; lacks 5-V tolerance and hot-swap capability. | Select when cost sensitivity outweighs mixed-voltage and hot-insertion requirements. |
| SN74AVC245RHLR | 1.2–3.6 V VCC, 12-bit variant, no bus-hold, higher speed (tPD ≤ 2.2 ns), QFN-24. | Designed for ultra-low-voltage mobile SoC interfaces; incompatible pinout and thermal profile. | Choose for sub-1.8-V designs or when footprint allows QFN-24 and higher bandwidth is mandatory. |
Compared with SN74LVC245APWR and SN74AVC245RHLR, the SN74LVTH245APWR uniquely combines 5-V input tolerance, integrated bus-hold, and Ioff-enabled hot insertion - making it the only option among the three qualified for legacy 5-V system integration and field-serviceable hardware.
Availability
SN74LVTH245APWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-MCU bridges, and modular telecom line cards requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH245APWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74LVTH245A product line delivers ABT-based octal transceivers engineered for mixed-voltage system interoperability, hot-swap reliability, and reduced board-level component count in mission-critical infrastructure equipment.
FAQ
What is the maximum operating voltage for SN74LVTH245APWR?
The absolute maximum supply voltage (VCC) for SN74LVTH245APWR is 4.6 V, but the recommended operating range is 2.7 V to 3.6 V. Input voltages up to 7 V are permitted - enabling direct connection to 5-V logic without external clamping diodes. This rating is confirmed in the Absolute Maximum Ratings table of the SCBS130T datasheet.
Does SN74LVTH245APWR require external pull-up resistors on its data inputs?
No, SN74LVTH245APWR does not require external pull-up or pull-down resistors on A or B port inputs because it integrates active bus-hold circuitry. This feature maintains valid logic states on floating inputs, eliminating resistor networks and reducing PCB area. The bus-hold current is specified as ±750 µA at VCC = 3.6 V.
Can SN74LVTH245APWR be used in hot-swap applications?
Yes, SN74LVTH245APWR is explicitly designed for hot-insertion applications using Ioff and power-up 3-state functionality. When VCC = 0, Ioff limits current to ±100 µA, preventing backflow into powered systems. During power-up/power-down, outputs remain in high-impedance state, avoiding bus conflicts - verified in TI's application notes on hot-swap compliance.
What is the thermal resistance (θJA) of SN74LVTH245APWR in its TSSOP package?
The junction-to-ambient thermal resistance (θJA) for SN74LVTH245APWR in the TSSOP-20 (PW) package is 83°C/W, as specified in the Absolute Maximum Ratings section of the SCBS130T datasheet. This value assumes standard JEDEC High-K test board conditions and guides heatsink or copper pour design for continuous 64-mA output loading.
How does the DIR pin control data flow direction in SN74LVTH245APWR?
In SN74LVTH245APWR, the DIR pin determines bidirectional data path: when DIR = LOW, data flows from Port B to Port A; when DIR = HIGH, data flows from Port A to Port B. This logic-level control is independent of OE status - direction remains defined even when outputs are disabled, ensuring predictable behavior during system initialization sequences.
SN74LVTH245APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVTH245APWR FAQ
1.How can I place an order for SN74LVTH245APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245APWR 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 SN74LVTH245APWR reliable?
The price and inventory of SN74LVTH245APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245APWR is usually 5 days.
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SN74LVTH245APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH245APWR 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 SN74LVTH245APWR?
For technical support, including SN74LVTH245APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245APWR requirements.
6.How does Aetrix verify that SN74LVTH245APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245APWR 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 SN74LVTH245APWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH245APWR?
All SN74LVTH245APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245APWR, 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 SN74LVTH245APWR part is unused and in its original packaging.
Return procedure for SN74LVTH245APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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