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Texas Instruments SN74LVTH2245DWE4
- Part No.:
- SN74LVTH2245DWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH2245DWE4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
SN74LVTH2245DWE4 from Texas Instruments is an octal bus transceiver IC designed for 3.3-V VCC operation with mixed-mode 5-V input/output tolerance, enabling TTL-level interfacing between 3.3-V and 5-V data buses. It features direction control (DIR), output enable (OE), bus-hold on all data inputs, and 22-Ω series resistors on B-port outputs - eliminating external termination. Used in industrial backplane interfaces and legacy system upgrades requiring voltage-level translation and hot-insertion support.
For engineers reviewing the SN74LVTH2245DWE4 datasheet, SN74LVTH2245DWE4 pinout, SN74LVTH2245DWE4 application, or SN74LVTH2245DWE4 equivalent, key selection criteria include its 2.7–3.6-V supply range, Ioff/power-up 3-state for hot-swap compliance, ±100 µA Ioff at VCC = 0 V, and guaranteed 12 mA B-port drive capability with integrated series resistance.
Technical Context
This device implements asynchronous bidirectional data flow between two 8-bit buses using a single DIR signal to select A→B or B→A transmission, while OE independently places both ports into high-impedance isolation. The A-port supports ±64 mA drive strength; the B-port delivers ±12 mA with built-in 22-Ω series termination to suppress overshoot/undershoot.
Bus-hold circuitry actively maintains unused inputs at valid logic levels without external pull resistors, and Ioff protection prevents current backflow during power-down. Power-up 3-state ensures outputs remain high-Z until VCC exceeds 1.5 V, supporting robust hot-insertion in modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - enables stable operation from unregulated batteries or noisy 3.3-V rails. |
| IOL (A port) | 64 mA max - supports driving heavy capacitive loads or multiple TTL inputs directly. |
| IOL (B port) | 12 mA max with 22-Ω series resistance - reduces EMI and eliminates need for external series resistors. |
| tPLH/tPHL | ≤ 5.3 ns at VCC = 3.3 V - ensures sub-6 ns propagation delay for high-speed bus arbitration. |
| Ioff | ±100 µA at VCC = 0 V - blocks damaging back-current during live insertion or partial power-down. |
| Bus-Hold Current | ±750 µA max at VCC = 3.6 V - reliably holds floating inputs without external biasing components. |
| VIH/VIL | 2.0 V / 0.8 V - compatible with standard TTL logic thresholds for seamless 5-V interface integration. |
Pinout & Package
SN74LVTH2245DWE4 is packaged in a 20-pin SOIC (DW) body measuring 12.8 mm × 7.5 mm × 2.65 mm (max height), JEDEC MS-013 compliant, with 1.27-mm lead pitch and NIPDAU lead finish. RoHS-compliant, MSL Level-1, rated for −40°C to +85°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A-port data inputs/outputs | Bidirectional A-side bus interface; driven by DIR/OE state; support ±64 mA drive. |
| 9 | GND | Ground reference for all internal circuitry and I/O structures. |
| 10, 11, 12, 13, 14, 15, 16, 17 | B-port data inputs/outputs | Bidirectional B-side bus interface; include 22-Ω series resistance; rated ±12 mA. |
| 18 | VCC | Primary 2.7–3.6-V supply; powers internal logic and I/O buffers. |
| 19 | DIR | Direction control input: LOW = B→A, HIGH = A→B; TTL-compatible threshold. |
| 20 | OE | Output enable: LOW = active transceiver, HIGH = both ports high-Z; supports hot-swap sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5-V tolerant inputs/outputs on 3.3-V VCC - enables direct connection to legacy 5-V peripherals without level shifters. |
| Integrated B-port series termination | 22-Ω on-chip resistors - eliminate external components, reduce PCB area, and suppress signal reflections. |
| Bus-hold circuitry | Active hold on all A/B data pins - prevents floating-input metastability and removes need for pullup/pulldown resistors. |
| Hot-insertion support | Ioff and power-up 3-state - ensures safe insertion into powered-backplane systems without bus contention or latch-up. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes during switching. |
Applications
| Industrial Backplane Interface | Legacy System Voltage Translation |
|---|---|
|
Use Scenario: Interfacing a modern 3.3-V FPGA-based controller to legacy 5-V ISA or VMEbus peripherals in factory automation equipment. IC Role / Device Role / Timing Role: Bidirectional bus transceiver translating data and control signals between mismatched voltage domains while maintaining timing integrity. Use Value: Eliminates discrete level-shifter arrays and reduces BOM count by integrating bus-hold, termination, and hot-swap protection in one 20-pin SOIC. |
Use Scenario: Upgrading aging test instrumentation with 3.3-V microcontrollers while retaining existing 5-V sensor signal chains and display drivers. IC Role / Device Role / Timing Role: Asynchronous data bridge enabling real-time sensor readout and command forwarding across voltage boundaries. Use Value: Guarantees sub-6 ns propagation delay and 5-V-tolerant I/O, preserving system timing margins without redesigning signal routing. |
| Modular Hot-Swap Subsystem | Embedded Control Bus Isolation |
|
Use Scenario: Slot-based telecom line card where modules must be inserted/removed without powering down the main backplane. IC Role / Device Role / Timing Role: Isolating local control bus from shared backplane during insertion via Ioff and power-up 3-state behavior. Use Value: Prevents current backflow and bus contention during live insertion, meeting GR-63-CORE reliability requirements. |
Use Scenario: Segregating noisy motor-driver control lines from sensitive analog acquisition circuits on a single PCB. IC Role / Device Role / Timing Role: Direction-controlled buffer isolating digital control signals while blocking noise coupling through shared VCC/GND paths. Use Value: Reduces crosstalk-induced ADC errors by >12 dB via controlled impedance and low ground bounce (<0.8 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245APW | No bus-hold; lower drive (24 mA A-port); no 5-V tolerance on inputs - requires external level shifting for 5-V interfaces. | Suitable only for pure 3.3-V-to-3.3-V isolation; not viable for mixed-voltage systems. | Select when cost is critical and all connected devices operate at 3.3 V; avoid if interfacing 5-V logic. |
| SN74ALVC162245DGGR | 16-bit version in 48-pin TSSOP; higher speed (tPD ≤ 3.3 ns); same 5-V tolerant I/O but no integrated B-port series resistors. | Used in wider data buses (e.g., memory expansion); requires external 22-Ω resistors for B-port signal integrity. | Choose for 16-bit parallel paths where board space permits larger package and external termination is acceptable. |
Compared with SN74LVC2245APW and SN74ALVC162245DGGR, SN74LVTH2245DWE4 uniquely combines 5-V I/O tolerance, integrated B-port termination, and bus-hold in an 8-bit SOIC - making it the only drop-in solution for retrofitting legacy 5-V subsystems without layout changes or added passives.
Availability
SN74LVTH2245DWE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system voltage translation, modular hot-swap subsystems, and embedded control bus isolation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH2245DWE4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH2245DWE4 belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interoperability and hot-plug reliability in mission-critical industrial and telecom infrastructure.
FAQ
What is the maximum operating temperature range for SN74LVTH2245DWE4?
The SN74LVTH2245DWE4 is specified for operation from −40°C to +85°C ambient temperature. This industrial-grade range is validated per the recommended operating conditions table in the official datasheet (SCBS707E), and applies to the SOIC (DW) package variant. Thermal derating is not required within this envelope when mounted per JEDEC MS-013 guidelines.
Does SN74LVTH2245DWE4 support true 5-V input tolerance on all pins?
Yes, SN74LVTH2245DWE4 supports 5-V tolerant inputs across all A- and B-port data pins, DIR, and OE - verified under VI ≤ 5.5 V per absolute maximum ratings. This allows direct connection to 5-V logic without external clamping or level-shifting, provided VCC remains within 2.7–3.6 V.
Can SN74LVTH2245DWE4 be used without external pull-up or pull-down resistors on data lines?
Yes. SN74LVTH2245DWE4 integrates active bus-hold circuitry on all A- and B-port inputs, eliminating the need for external pull resistors. The bus-hold current (±750 µA max at VCC = 3.6 V) maintains valid logic states on unused or floating inputs - confirmed in the electrical characteristics table of SCBS707E.
What is the purpose of the 22-Ω series resistance on the B-port outputs of SN74LVTH2245DWE4?
The 22-Ω on-die series resistance on each B-port output reduces signal overshoot and undershoot during fast edge transitions, improving signal integrity on unterminated or lightly loaded traces. This feature removes the need for discrete series resistors, saving PCB area and assembly cost - explicitly stated in the device description and functional overview of SCBS707E.
Is SN74LVTH2245DWE4 suitable for hot-insertion applications?
Yes. SN74LVTH2245DWE4 incorporates both Ioff circuitry (±100 µA max at VCC = 0 V) and power-up 3-state logic, ensuring outputs remain high-impedance during power ramp-up/down. These features are explicitly validated for hot-insertion use cases and meet JESD17 latch-up and JESD22 ESD standards - detailed in the "Features" and "Absolute Maximum Ratings" sections of SCBS707E.
SN74LVTH2245DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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; 12mA, 12mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVTH2245DWE4 FAQ
1.How can I place an order for SN74LVTH2245DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH2245DWE4 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 SN74LVTH2245DWE4 reliable?
The price and inventory of SN74LVTH2245DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH2245DWE4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH2245DWE4 transactions.
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SN74LVTH2245DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH2245DWE4 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 SN74LVTH2245DWE4?
For technical support, including SN74LVTH2245DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH2245DWE4 requirements.
6.How does Aetrix verify that SN74LVTH2245DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH2245DWE4 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 SN74LVTH2245DWE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH2245DWE4?
All SN74LVTH2245DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH2245DWE4, 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 SN74LVTH2245DWE4 part is unused and in its original packaging.
Return procedure for SN74LVTH2245DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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