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Texas Instruments SN74LVTZ245DW
- Part No.:
- SN74LVTZ245DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVTZ245DW.pdf
- Description:
- BUS TRANSCEIVER
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Inventory:9,265
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Product details
Overview
SN74LVTZ245DW from Texas Instruments is an octal bus transceiver IC designed for 3.3-V VCC operation with mixed-mode 5-V input/output tolerance, 8-bit bidirectional data flow controlled by DIR and OE pins, and bus-hold circuitry eliminating external pull resistors - used in voltage-level translation between 3.3-V logic buses and legacy 5-V systems.
For engineers reviewing the SN74LVTZ245DW datasheet, SN74LVTZ245DW pinout, SN74LVTZ245DW application, or SN74LVTZ245DW equivalent, key selection criteria include its 2.7–3.6-V supply range, ±64-mA output drive, 4.1–5.7-ns propagation delay at 3.3 V, high-impedance state during power sequencing, and SOIC-20 (DW) package compatibility with industrial temperature range (−40°C to 85°C).
Technical Context
This device implements asynchronous bidirectional data transfer between two 8-bit buses using a single direction-control (DIR) signal and output-enable (OE) control. Its ABT BiCMOS process enables TTL-compatible 5-V signaling while operating from a 3.3-V supply, with bus-hold inputs maintaining valid logic states on floating A/B port lines without external components.
It features active high-impedance isolation during power-up/down, supports unregulated battery operation down to 2.7 V, and meets JEDEC JESD-17 latch-up immunity (>500 mA). Output ground bounce (VOLP) is specified <0.8 V at VCC = 3.3 V, TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide-input unregulated battery rails and stable 3.3-V system operation |
| IOL / IOH | 64 mA / −32 mA - drives standard TTL loads directly without buffer stages |
| tPLH / tPHL | 2.5 ns to 5.7 ns - ensures sub-6-ns timing margins for high-speed 3.3-V bus interfacing |
| VIH / VIL | 2.0 V / 0.8 V - compatible with both 3.3-V CMOS and 5-V TTL input thresholds |
| Bus-Hold Current | ±75 µA - actively holds unused A/B port inputs at valid logic levels, removing need for external resistors |
| ICC (Active) | 8.8 mA max at VCC = 3.6 V - low static power dissipation critical for portable and thermally constrained designs |
| IOFF | ±100 µA at VCC = 0 - prevents backfeeding and leakage when powered down |
Pinout & Package
SN74LVTZ245DW is housed in a 20-pin SOIC (DW) package per JEDEC MS-013, 7.6 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, with gull-wing leads and standard surface-mount land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: LOW enables B→A data flow; HIGH enables A→B data flow |
| 2–9 | A1–A8 | Port A data I/O terminals - connect to source bus (e.g., microcontroller side) |
| 10 | GND | Ground reference for all internal circuitry and I/O |
| 11 | VCC | 3.3-V supply input - powers internal BiCMOS core and level-shifting circuitry |
| 12–19 | B1–B8 | Port B data I/O terminals - connect to destination bus (e.g., 5-V peripheral side) |
| 20 | OE | Output enable: LOW activates transceiver; HIGH places both ports in high-impedance isolation |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V tolerant I/O | Accepts and drives 5-V signals while powered from 3.3-V rail - eliminates external level shifters in mixed-voltage systems |
| Integrated bus-hold circuitry | Actively maintains logic state on floating A/B inputs - removes need for 10-kΩ pullup/pulldown resistors and saves PCB space |
| Power-up/power-down high-Z | Outputs remain in high-impedance state during supply ramping - prevents bus contention and system glitches during power sequencing |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - reduces noise coupling into shared ground planes in dense digital layouts |
| Latch-up immunity | >500 mA per JEDEC JESD-17 - ensures robustness against transient overcurrent events in industrial environments |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Extension |
|---|---|
Use Scenario: Interfacing a 3.3-V ARM-based controller to legacy 5-V I/O modules across a DIN-rail-mounted backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver enabling synchronous data exchange between mismatched logic families. Use Value: Eliminates discrete level-shifter arrays and reduces BOM count while maintaining <6-ns propagation delay for deterministic I/O response. | Use Scenario: Extending GPIO and address/data bus lines from a compact SoM to external peripherals (ADCs, displays, EEPROMs) operating at 5-V. IC Role / Device Role / Timing Role: Octal bidirectional buffer with direction control, providing isolated, slew-rate-controlled signal routing. Use Value: Bus-hold inputs prevent floating states during hot-plug events or peripheral reset, improving system reliability without added passives. |
| Test Equipment Signal Conditioning | Automated Test Fixture Data Mux |
Use Scenario: Level-shifting and isolating DUT interface signals in benchtop ATE where 3.3-V FPGA controllers drive 5-V instrumentation buses. IC Role / Device Role / Timing Role: Controlled-direction transceiver supporting both read and write cycles under FPGA logic control. Use Value: 2.7–3.6-V operation accommodates brown-out conditions; high-impedance isolation prevents backdrive during test mode transitions. | Use Scenario: Multiplexing multiple 5-V sensor outputs onto a shared 3.3-V data acquisition channel in production test fixtures. IC Role / Device Role / Timing Role: Direction-configurable bus switch enabling time-division multiplexing of bidirectional sensor interfaces. Use Value: OE-controlled isolation allows dynamic reconfiguration of signal paths without hardware changes or layout modifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH245A | Lower drive strength (±24 mA), no bus-hold, 2.7–3.6-V only, same SOIC-20 footprint | Requires external pull resistors; unsuitable where floating inputs must be avoided | Select when cost sensitivity outweighs bus-hold requirement and load current ≤24 mA |
| 74ALVC16245 | 16-bit, dual-supply (1.65–3.6-V), no 5-V tolerance, higher pin count (48-pin TSSOP) | Not pin-compatible; requires PCB redesign; lacks mixed-voltage capability | Choose only for new 3.3-V-only systems needing wider bus width and lower power |
Compared with SN74LVTH245A and 74ALVC16245, the SN74LVTZ245DW uniquely combines 5-V I/O tolerance, integrated bus-hold, and 64-mA drive in a standard SOIC-20 package - making it irreplaceable in legacy interface upgrades requiring zero-layout-change integration.
Availability
SN74LVTZ245DW is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus extensions, test equipment signal conditioning, and automated test fixture data mux applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74LVTZ245DW 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 specializing in analog, embedded processing, and logic solutions, with leadership in industrial, automotive, and communications markets.
The SN74LVTZ245DW belongs to TI's ABT Advanced BiCMOS logic family, engineered for robust 3.3-V system interfacing with legacy 5-V infrastructure - targeting voltage translation in industrial control, test instrumentation, and embedded computing.
FAQ
What is the operating temperature range for SN74LVTZ245DW?
The SN74LVTZ245DW is characterized for operation from −40°C to +85°C, meeting industrial-grade thermal requirements. This range is explicitly defined in the recommended operating conditions table of the SCBS303C datasheet and applies specifically to the DW-package variant. It does not support extended military-range operation like the SN54LVTZ245 (−55°C to 125°C), and thermal derating is required above 85°C ambient.
Does SN74LVTZ245DW support true 5-V input and output operation?
Yes, SN74LVTZ245DW supports 5-V input and output voltages while powered from a 3.3-V VCC supply. The absolute maximum input voltage is rated to 7 V, and functional operation up to 5.5 V is confirmed in the recommended operating conditions. Outputs drive 5-V TTL loads with VOH ≥2.0 V and VOL ≤0.55 V at IOL = 64 mA, enabling direct interfacing with legacy 5-V logic without external level shifters.
How does the bus-hold feature work on SN74LVTZ245DW?
The SN74LVTZ245DW integrates active bus-hold circuitry on all A and B port inputs, providing ±75 µA holding current to maintain the last-valid logic state when inputs float. This eliminates the need for external 10-kΩ pullup or pulldown resistors. Bus-hold is always enabled and requires no configuration - it operates independently of DIR or OE states and remains functional even during power-up sequences.
Can SN74LVTZ245DW be used in hot-swap applications?
SN74LVTZ245DW supports hot-swap use cases due to its power-up/power-down high-impedance behavior and ±100 µA off-state leakage (IOFF) at VCC = 0. When VCC is absent or ramping, outputs remain in high-Z, preventing backdrive into live buses. However, it lacks dedicated hot-swap protection (e.g., slew-rate limiting or fault reporting), so external current limiting or sequencing remains advisable in high-reliability systems.
Is SN74LVTZ245DW pin-compatible with other 74-series transceivers?
SN74LVTZ245DW shares the same 20-pin SOIC (DW) pinout and function mapping as SN74LVC245A and SN74LVTH245A, including identical DIR, OE, A1–A8, B1–B8, VCC, and GND locations. However, electrical differences - such as 5-V tolerance, bus-hold presence, and drive strength - mean functional substitution requires validation. It is not pin-compatible with 24-pin or 48-pin variants like 74ALVC16245.
SN74LVTZ245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVTZ245DW FAQ
1.How can I place an order for SN74LVTZ245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTZ245DW 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 SN74LVTZ245DW reliable?
The price and inventory of SN74LVTZ245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTZ245DW is usually 5 days.
3.What payment methods are accepted for SN74LVTZ245DW?
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4.How is shipping managed for SN74LVTZ245DW?
SN74LVTZ245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTZ245DW 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 SN74LVTZ245DW?
For technical support, including SN74LVTZ245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTZ245DW requirements.
6.How does Aetrix verify that SN74LVTZ245DW is sourced from the original manufacturer or authorized distributors?
All SN74LVTZ245DW 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 SN74LVTZ245DW meets industry standards.
7.What is the process for return or replacement of SN74LVTZ245DW?
All SN74LVTZ245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTZ245DW, 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 SN74LVTZ245DW part is unused and in its original packaging.
Return procedure for SN74LVTZ245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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