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Texas Instruments SN74LVTH245ADB
- Part No.:
- SN74LVTH245ADB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH245ADB.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,750
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Product details
Overview
SN74LVTH245ADB from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 3.3-V and 5-V systems. It features bus-hold circuitry on all data inputs, Ioff support for hot insertion, and operates across –40°C to 85°C with VCC down to 2.7 V. Used in mixed-voltage backplane interfaces and legacy bus bridging.
For engineers reviewing the SN74LVTH245ADB datasheet, SN74LVTH245ADB pinout, SN74LVTH245ADB application, or SN74LVTH245ADB equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V tolerant I/O, ±64 mA output drive at 3 V, 3.5 ns typical propagation delay, and DB (SSOP-20) package footprint for space-constrained board designs.
Technical Context
This device implements an advanced BiCMOS (ABT) architecture enabling low static power dissipation while maintaining TTL-compatible voltage thresholds and robust noise immunity. Its dual-rail I/O tolerance allows direct connection to 5-V buses without level shifters, and the integrated bus-hold circuit eliminates external pullup/pulldown resistors on A/B data lines.
The SN74LVTH245ADB uses active direction control (DIR) and output-enable (OE) logic to manage data flow: DIR selects A→B or B→A transmission, while OE places outputs in high-impedance state. Power-up 3-state and Ioff protection ensure safe hot-insertion by disabling outputs during VCC ramp-up or shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and ensures stable function across industrial supply variance. |
| IOL / IOH | 64 mA / –32 mA at VCC = 3 V - drives standard TTL loads directly without buffer amplification. |
| tPLH / tPHL | 2.3 ns / 2.1 ns typical at VCC = 3.3 V - enables high-speed bus arbitration in real-time control systems. |
| VIH / VIL | 2.0 V / 0.8 V - compatible with 5-V CMOS/TTL input thresholds while powered from 3.3 V. |
| Bus-Hold Current | ±75 µA at VCC = 3 V - maintains valid logic levels on floating data lines without external components. |
| IOFF | ±100 µA at VCC = 0 - prevents damaging backflow current during hot-swap events. |
| θJA (DB) | 115°C/W - defines thermal derating limits for continuous 64-mA output operation in ambient up to 70°C. |
Pinout & Package
SN74LVTH245ADB is housed in a 20-pin Shrink Small-Outline Package (SSOP-20, DB), 7.2 mm × 5.3 mm body, 0.65 mm lead pitch, with gull-wing leads and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data inputs/outputs (A-side bus) | Bidirectional I/O pins connected to local 3.3-V subsystem; internally bus-held when floating. |
| B1–B8 | Data inputs/outputs (B-side bus) | Bidirectional I/O pins interfacing to 5-V legacy bus; tolerate VI up to 7 V. |
| DIR | Direction control input | High = A→B data flow; Low = B→A; referenced to VCC, TTL-compatible threshold. |
| OE | Output enable input | Active-Low: drives all A/B outputs into high-Z when asserted; supports isolation during bus arbitration. |
| VCC | Power supply | 3.3-V nominal supply; functional down to 2.7 V; must be decoupled locally per ABT design guidelines. |
| GND | Ground reference | Common return for all I/O and supply currents; requires low-inductance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O tolerance | 5-V input/output voltage capability with 3.3-V VCC - eliminates external level translators in 3.3/5-V bridge applications. |
| Integrated bus-hold | Active on all A/B data pins - removes need for 10-kΩ external pullups, reducing BOM count and layout area. |
| Hot-insertion support | Ioff and power-up 3-state circuitry - prevents backdrive damage and bus contention during live card replacement. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - minimizes switching noise coupling into analog sections or adjacent digital signals. |
| Latch-up immunity | Exceeds 500 mA per JESD17 - ensures robustness in noisy industrial environments with transient ESD or load dump events. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridge |
|---|---|
Use Scenario: Interfacing a modern 3.3-V FPGA-based controller to an older 5-V ISA or VME bus in factory automation equipment. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction via DIR and isolating buses via OE during configuration cycles. Use Value: Enables drop-in integration without redesigning power or signal conditioning; bus-hold prevents glitches during bus arbitration timeouts. |
Use Scenario: Upgrading a 5-V microcontroller subsystem with a 3.3-V SoC while retaining existing peripheral modules and address/data bus wiring. IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver providing synchronous read/write handshaking between mismatched voltage domains. Use Value: Eliminates discrete resistor networks and level-shifter ICs, reducing layer count and improving signal integrity at 20-MHz bus rates. |
| Hot-Swappable Module Interface | Embedded Test Equipment Data Link |
Use Scenario: Carrier board supporting field-replaceable I/O modules where modules may be inserted or removed while system remains powered. IC Role / Device Role / Timing Role: Isolation gate with Ioff and power-up 3-state ensuring no current backflow or bus conflict during insertion/removal sequences. Use Value: Meets MIL-STD-883 ESD requirements (2000 V HBM) and enables zero-downtime maintenance in telecom and medical rack systems. |
Use Scenario: High-reliability boundary-scan test adapter connecting a 3.3-V JTAG controller to 5-V DUTs in automated test fixtures. IC Role / Device Role / Timing Role: Controlled-direction transceiver synchronizing TDI/TDO/TMS signals across voltage domains with sub-4-ns skew. Use Value: Maintains IEEE 1149.1 timing margins under worst-case process/voltage/temperature corners due to guaranteed tPLH/tPHL specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower drive strength (24 mA IOL), no bus-hold, no Ioff, rated only to 3.6 V VCC max. | Suitable for clean 3.3-V-only systems without hot-swap or floating-bus requirements. | Select when cost sensitivity outweighs mixed-voltage robustness and bus-hold convenience. |
| SN74ALVCH16245 | 16-bit, dual-supply (VCCA/VCCB), higher speed (1.9 ns tPD), but larger TSSOP-48 package and no bus-hold. | Targets high-density memory or processor interconnects requiring wider data paths and tighter timing. | Choose for 16-bit parallel interfaces where pin count and board area allow larger footprint and dual-rail flexibility. |
Compared with SN74LVC245A and SN74ALVCH16245, the SN74LVTH245ADB uniquely combines 5-V I/O tolerance, integrated bus-hold, and Ioff-enabled hot insertion in a compact 20-pin SSOP-making it optimal for retrofitting legacy 5-V infrastructure with modern 3.3-V controllers without layout or firmware changes.
Availability
SN74LVTH245ADB is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus bridges, hot-swappable module interfaces, and embedded test equipment data links requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH245ADB 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 logic solutions, with decades of experience in high-reliability interface ICs for industrial and automotive markets.
The SN74LVTH245ADB belongs to TI's ABT logic family, engineered specifically for mixed-voltage system interoperability-enabling seamless communication between emerging low-voltage logic and established 5-V infrastructure in industrial control and communications equipment.
FAQ
What is the maximum operating temperature range for the SN74LVTH245ADB?
The SN74LVTH245ADB is characterized for operation from –40°C to +85°C, meeting industrial-grade thermal requirements. This range is explicitly defined in the datasheet's recommended operating conditions table and applies to all electrical specifications including propagation delay, drive strength, and bus-hold functionality. The SN74LVTH245ADB does not support the extended –55°C to +125°C range specified for the military-grade SN54LVTH245A variant.
Does the SN74LVTH245ADB require external pullup resistors on its data lines?
No, the SN74LVTH245ADB includes active bus-hold circuitry on all A1–A8 and B1–B8 data inputs, eliminating the need for external pullup or pulldown resistors. This feature maintains valid logic states on unused or floating inputs with ±75 µA hold current at VCC = 3 V, reducing BOM cost and PCB routing complexity. External resistors are only required for OE if pulled up to VCC for default disable behavior.
Can the SN74LVTH245ADB safely interface a 3.3-V microcontroller with a 5-V sensor bus?
Yes, the SN74LVTH245ADB supports mixed-mode signal operation: its inputs tolerate up to 7 V, and outputs drive 5-V TTL loads with VOH ≥ 2.4 V at IOL = 24 mA. When configured with DIR set appropriately and OE enabled, the SN74LVTH245ADB provides bidirectional level translation without external components, making it ideal for connecting 3.3-V MCUs to legacy 5-V sensor or actuator buses.
What package type does the SN74LVTH245ADB use, and is it RoHS compliant?
The SN74LVTH245ADB uses a 20-pin Shrink Small-Outline Package (DB), measuring 7.2 mm × 5.3 mm with 0.65 mm lead pitch. While the original 1999 datasheet predates RoHS, Texas Instruments confirms DB-package variants of this device family meet RoHS Directive 2011/65/EU and are lead-free, halogen-free, and compliant with JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) when shipped in dry-pack packaging.
How does the SN74LVTH245ADB handle power-up sequencing in systems with multiple voltage rails?
The SN74LVTH245ADB incorporates power-up 3-state circuitry that forces all outputs into high-impedance during VCC ramp-up or ramp-down, preventing bus contention. When VCC is below 1.5 V, the device is inherently in high-Z; above 1.5 V, OE must be actively controlled (e.g., pulled to VCC) to guarantee isolation. This behavior is documented in the functional description and ensures safe power sequencing in multi-rail embedded systems using the SN74LVTH245ADB.
SN74LVTH245ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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-SSOP
SN74LVTH245ADB FAQ
1.How can I place an order for SN74LVTH245ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH245ADB 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 SN74LVTH245ADB reliable?
The price and inventory of SN74LVTH245ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH245ADB is usually 5 days.
3.What payment methods are accepted for SN74LVTH245ADB?
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SN74LVTH245ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH245ADB 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 SN74LVTH245ADB?
For technical support, including SN74LVTH245ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH245ADB requirements.
6.How does Aetrix verify that SN74LVTH245ADB is sourced from the original manufacturer or authorized distributors?
All SN74LVTH245ADB 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 SN74LVTH245ADB meets industry standards.
7.What is the process for return or replacement of SN74LVTH245ADB?
All SN74LVTH245ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH245ADB, 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 SN74LVTH245ADB part is unused and in its original packaging.
Return procedure for SN74LVTH245ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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