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Texas Instruments SN74LVC245APWT
- Part No.:
- SN74LVC245APWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC245APWT.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
SN74LVC245APWT from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It features direction control (DIR), output enable (OE), 5.5-V-tolerant inputs, 6.3 ns max propagation delay at 3.3 V, and Ioff support for live insertion in mixed-voltage systems - used in LED display drivers and telecom infrastructure backplanes.
For engineers reviewing the SN74LVC245APWT datasheet, SN74LVC245APWT pinout, SN74LVC245APWT application, or SN74LVC245APWT equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 20-pin TSSOP package footprint, 3-state bus isolation timing, and Ioff-enabled partial-power-down robustness in hot-swap environments.
Technical Context
The SN74LVC245APWT implements dual-bus bidirectional data flow controlled by a single DIR input: high enables A→B transmission, low enables B→A. Its OE input places all eight channels into high-impedance state, enabling bus isolation. The device uses advanced CMOS logic with balanced drive strength and overvoltage-tolerant inputs that accept up to 5.5 V regardless of VCC level (1.65–3.6 V).
It supports mixed-mode signal operation across voltage domains, allowing interoperability between 5-V legacy peripherals and 3.3-V or 1.8-V system logic. Ioff circuitry actively disables outputs during power-down, preventing back-drive current and latch-up - critical for systems requiring live insertion or partial power-down modes per JESD 78 Class II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into modern low-voltage digital systems without level-shifting circuitry |
| Input Voltage Tolerance | Up to 5.5 V - allows safe interfacing with 5-V TTL/CMOS sources while powered from 3.3 V or lower |
| Max Propagation Delay | 6.3 ns at 3.3 V - ensures sub-10 ns timing margin for high-speed parallel bus applications up to ~80 MHz |
| Ioff Current | < ±20 μA at VCC = 0 V - guarantees zero back-current during hot-plug events or partial power-down sequences |
| Output Drive Strength | ±24 mA at 3.0 V - sufficient to drive 50-pF loads over 10-cm PCB traces without external buffers |
| ESD Rating | 2000-V HBM / 1000-V CDM - meets industrial-grade ESD immunity requirements per JEDEC standards |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control cabinet deployments |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant NIPDAU lead finish, MSL Level-1 (260°C, unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A; determines real-time bus polarity without reset or configuration registers |
| 19 (OE) | Output Enable Input | Active-low; asserts high-impedance on all A/B I/Os when high - essential for bus arbitration and multi-master isolation |
| 2–9 (A1–A8) | Port A I/O Pins | Bidirectional data lines tied to one bus segment; tolerate 5.5 V inputs independent of VCC |
| 11–18 (B1–B8) | Port B I/O Pins | Bidirectional data lines tied to second bus segment; electrically identical to A-side pins |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; must be low-inductance connection to minimize ground bounce |
| 20 (VCC) | Power Supply | Single supply for core logic and I/O; requires local 0.1-μF ceramic bypass capacitor placed within 3 mm |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage translation | Enables seamless 5-V ↔ 3.3-V ↔ 1.8-V bus bridging without external level shifters or voltage regulators |
| Ioff partial-power-down | Prevents damaging back-current when VCC = 0 V, supporting hot-swap capability in modular backplane systems |
| Low ground bounce (VOLP < 0.8 V) | Reduces switching noise coupling into analog sections or adjacent high-speed signals on shared PCB layers |
| High noise immunity (VOHV > 2 V) | Minimizes false triggering from transient coupling on output lines during fast edge transitions |
| Latch-up immunity > 250 mA | Ensures robust operation under ESD or short-circuit fault conditions per JESD17 Class II compliance |
Applications
| LED Display Driver Interface | Telecom Backplane Isolation |
|---|---|
Use Scenario: Driving 8-bit column data from a 3.3-V FPGA to a 5-V LED matrix with common-anode architecture. IC Role / Device Role / Timing Role: Bidirectional bus transceiver translating logic levels and isolating FPGA I/O from higher-voltage display sink drivers. Use Value: Eliminates discrete level-shifters; 24-mA drive supports direct LED segment sinking; Ioff prevents FPGA damage during display module hot-swap. | Use Scenario: Isolating control bus between line-card MCU (3.3 V) and shelf-management ASIC (5 V) in carrier-grade routers. IC Role / Device Role / Timing Role: Asynchronous bidirectional data bridge with configurable direction and cycle-accurate bus enable/disable. Use Value: 6.3 ns tpd ensures deterministic timing across 20-cm backplane traces; 5.5-V input tolerance avoids signal degradation from crosstalk-induced overshoot. |
| Industrial I/O Expander | Motor Control Logic Interface |
Use Scenario: Extending GPIO count of a 1.8-V microcontroller to interface with 3.3-V sensors and actuators via parallel bus. IC Role / Device Role / Timing Role: Voltage-translating octal buffer enabling mixed-supply peripheral connectivity without dedicated level translators. Use Value: Supports 1.65–3.6-V VCC range - operates directly from 1.8-V LDO; Ioff protects MCU during sensor hot-plug maintenance cycles. | Use Scenario: Interfacing a 3.3-V motor driver IC's status register (open-drain) to a 5-V PLC controller's input bus. IC Role / Device Role / Timing Role: Unidirectional level translator (B→A mode) with 5.5-V-tolerant inputs and 3.3-V-compatible outputs. Use Value: Replaces dual discrete MOSFET translators; 24-mA sink capability drives PLC input hysteresis thresholds reliably; VOLP < 0.8 V prevents false fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH245A | Higher drive (±32 mA), enhanced ESD (4-kV HBM), same pinout and VCC range | Better suited for longer trace lengths or heavier capacitive loads (>75 pF) | Select when higher output current or improved robustness is required without layout change |
| 74LVC245ADW | SOIC-20 package (12.8 mm × 7.5 mm), identical electrical specs, tube packaging | Preferred for through-hole prototyping or legacy board upgrades where TSSOP footprint is incompatible | Select for manual assembly, breadboarding, or compatibility with existing SOIC-based designs |
Compared with SN74LVCH245A, the SN74LVC245APWT offers lower cost and adequate drive for standard PCB interconnects; compared with 74LVC245ADW, it provides 40% smaller footprint and better thermal performance in space-constrained embedded modules.
Availability
SN74LVC245APWT is available at Aetrix Electronics and suitable for LED display interfaces, telecom backplane isolation, and industrial I/O expansion requiring stable component supply across automotive, industrial, and networking end markets.
Supply support for SN74LVC245APWT 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 consumer applications.
The SN74LVC245A product line delivers robust, low-voltage CMOS bus transceivers optimized for voltage translation, hot-swap reliability, and mixed-signal system interoperability in space- and power-constrained designs.
FAQ
What is the maximum operating voltage on the inputs of the SN74LVC245APWT?
The SN74LVC245APWT inputs tolerate up to 5.5 V regardless of VCC level - verified across the full 1.65–3.6-V supply range. This allows safe interfacing with 5-V logic families while the device operates at 3.3 V or lower, eliminating need for external clamping diodes or level shifters in mixed-voltage systems. The specification is guaranteed per TI's SCAS218X datasheet Section 7.3.
Does the SN74LVC245APWT support hot-swap or live-insertion applications?
Yes, the SN74LVC245APWT supports live insertion via its Ioff feature: when VCC = 0 V, all I/Os enter high-impedance state with leakage limited to ±20 μA, preventing back-current flow from powered buses into unpowered devices. This behavior is characterized per JESD78 Class II and enables safe hot-plug operation in modular backplanes and field-replaceable units without auxiliary power sequencing circuitry.
What is the propagation delay of the SN74LVC245APWT at 3.3 V?
The SN74LVC245APWT has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V ± 0.3 V, TA = 25°C, with 50-pF load - measured from DIR or OE transition to valid output transition. Typical tpd is 3.8 ns under same conditions. This value is specified in Table 7.6 of the official datasheet and applies to both A→B and B→A directions.
Can the SN74LVC245APWT be used for unidirectional level translation?
Yes, the SN74LVC245APWT can operate unidirectionally by holding DIR fixed (high for A→B, low for B→A) and using OE to gate data flow. Its 5.5-V-tolerant inputs and 1.65–3.6-V VCC range make it suitable for down-translation (e.g., 5-V → 3.3-V) or up-translation (e.g., 1.8-V → 3.3-V) depending on supply and signal source. No additional components are needed beyond proper bypassing and pull-up/down resistors.
What package type and dimensions does the SN74LVC245APWT use?
The SN74LVC245APWT uses a TSSOP-20 (PW) package measuring 6.50 mm × 4.40 mm with 0.65 mm lead pitch. It is RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating (260°C, unlimited reflow). The part marking "LC245A" appears on the top surface, and it ships in small tape-and-reel format (250 units per reel) - confirmed in TI's Package Option Addendum dated 10-Nov-2025.
SN74LVC245APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC245APWT FAQ
1.How can I place an order for SN74LVC245APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245APWT 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 SN74LVC245APWT reliable?
The price and inventory of SN74LVC245APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245APWT is usually 5 days.
3.What payment methods are accepted for SN74LVC245APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245APWT?
SN74LVC245APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245APWT 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 SN74LVC245APWT?
For technical support, including SN74LVC245APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245APWT requirements.
6.How does Aetrix verify that SN74LVC245APWT is sourced from the original manufacturer or authorized distributors?
All SN74LVC245APWT 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 SN74LVC245APWT meets industry standards.
7.What is the process for return or replacement of SN74LVC245APWT?
All SN74LVC245APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245APWT, 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 SN74LVC245APWT part is unused and in its original packaging.
Return procedure for SN74LVC245APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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