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NXP Semiconductors 74VHCT245PW/AUJ
- Part No.:
- 74VHCT245PW/AUJ
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT245PW/AUJ.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
74VHCT245PW/AUJ from Nexperia is an octal non-inverting 3-state bus transceiver with TTL-compatible inputs, designed for bidirectional data flow control between two 8-bit buses. It features separate direction (DIR) and active-low output enable (OE) controls, operates at 4.5 V to 5.5 V supply, supports -40 °C to +125 °C ambient range, and delivers propagation delay as low as 3.5 ns (VCC = 5 V, CL = 15 pF), enabling use in high-speed industrial microcontroller bus interfaces.
For engineers reviewing the 74VHCT245PW/AUJ datasheet, 74VHCT245PW/AUJ pinout, 74VHCT245PW/AUJ application, or 74VHCT245PW/AUJ equivalent, key selection criteria include its TTL-level input compatibility, 20-pin TSSOP package footprint, 8-bit bidirectional bus isolation capability, and guaranteed operation across extended temperature ranges without level-shifting circuitry.
Technical Context
The 74VHCT245PW/AUJ implements a CMOS-based octal transceiver architecture with independent DIR and OE logic control paths. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V TTL logic families without external biasing.
It provides true 3-state outputs on both A- and B-side ports, enabling bus contention avoidance during direction switching or system power-down. The device uses Schmitt-trigger action on all inputs to suppress noise-induced false transitions, and supports input voltages up to 7.0 V independent of VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic systems and stable operation under rail tolerance variations |
| Propagation delay | 3.5 ns (typ) at VCC = 5 V, CL = 15 pF - enables reliable timing in 100+ MHz bus clock domains |
| Input voltage thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees robust recognition of TTL logic levels without level shifters |
| Operating temperature | -40 °C to +125 °C - supports deployment in automotive engine control units and industrial motor drives |
| Output drive strength | ±8 mA at VCC = 4.5 V - sufficient to drive 50 pF loads across PCB traces while maintaining signal integrity |
| ESD protection | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 2 requirements for board-level handling robustness |
| Power dissipation capacitance | 15 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal design |
Pinout & Package
TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, exposed thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | LOW = A→B data flow; HIGH = B→A data flow; determines bus transfer direction synchronously with OE |
| 2 VCC | Positive supply | Primary 4.5–5.5 V power rail; decoupling capacitor must be placed within 5 mm for stable high-speed switching |
| 3–10 A0–A7 | A-side I/O port | Bidirectional data lines for first 8-bit bus; high-impedance when OE = HIGH or DIR conflict occurs |
| 11–18 B0–B7 | B-side I/O port | Bidirectional data lines for second 8-bit bus; isolated from A-side when OE = HIGH |
| 19 OE | Output enable (active LOW) | Drives all A/B outputs to high-impedance state when HIGH; enables bus arbitration and hot-swap isolation |
| 20 GND | Ground reference | 0 V return path for all internal logic and I/O; requires low-inductance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) without external pull-ups or level translators |
| Schmitt-trigger inputs | Provides hysteresis on all inputs to reject noise spikes up to 0.4 V, improving immunity in electrically noisy environments |
| Extended temperature range | Specified from -40 °C to +125 °C - qualified for under-hood automotive and industrial control applications |
| High-speed propagation | 3.5 ns typical tPD at 5 V/15 pF enables use in fast microcontroller peripheral buses and FPGA interconnects |
| Input overvoltage tolerance | Supports VI up to 7.0 V regardless of VCC - allows safe interfacing with mixed-voltage subsystems |
Applications
| Industrial PLC Backplane Interface | Microcontroller Expansion Bus Isolation |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: 8-bit bus transceiver managing address/data multiplexing and direction control between master and slave modules. Use Value: Enables hot-swappable I/O card insertion without bus contention, leveraging OE-driven high-Z state and DIR-controlled flow direction. |
Use Scenario: Interfacing an ARM Cortex-M4 microcontroller with external SRAM and peripheral ASICs sharing a common 8-bit data bus. IC Role / Device Role / Timing Role: Directional buffer isolating MCU data bus from external memory during read/write cycles. Use Value: Eliminates need for discrete MOSFET switches or complex glue logic by integrating OE/DIR control with sub-10 ns timing. |
| FPGA-to-ASIC Communication Link | Legacy System Bus Bridge |
Use Scenario: Data synchronization between Xilinx Artix-7 FPGA and custom ASIC implementing real-time sensor fusion algorithms. IC Role / Device Role / Timing Role: High-speed bidirectional bridge ensuring setup/hold compliance across asynchronous clock domains. Use Value: Provides deterministic 3.5 ns propagation delay and 6 ns enable/disable times for precise timing closure in FPGA pin planning. |
Use Scenario: Connecting modern 3.3 V microcontrollers to legacy 5 V parallel EEPROMs and LCD controllers in medical diagnostic equipment. IC Role / Device Role / Timing Role: Voltage-tolerant bus translator preserving TTL logic compatibility while supporting mixed-supply designs. Use Value: Removes level-shifter ICs and associated BOM cost by accepting 5 V inputs while operating from 5 V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245APW | CMOS input thresholds (VIH = 0.7×VCC), 1.65–5.5 V supply range, lower drive (±24 mA), 3.3 V optimized | Better suited for mixed-voltage 3.3 V/5 V systems but lacks native TTL input compatibility | Select when interfacing with modern low-voltage logic; avoid if legacy TTL signals are present |
| SN74LVC245ADW | Same LVC family specs as 74LVC245APW but in SOIC-20 (SOT163-1); identical electrical behavior, larger footprint | Preferred where TSSOP reflow constraints or mechanical clearance prevent use of 4.4 mm wide packages | Choose for manual assembly, prototyping, or legacy board compatibility requiring SOIC-20 |
Compared with 74VHCT245PW/AUJ, the 74LVC245APW offers wider supply flexibility but requires external level translation for TTL inputs, while SN74LVC245ADW provides identical functionality in a larger SOIC package-making it suitable for repair or redesign scenarios where footprint change is impractical.
Availability
74VHCT245PW/AUJ is available at Aetrix Electronics and suitable for industrial automation, automotive ECU backplanes, and embedded microcontroller expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT245PW/AUJ 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
Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.
The 74VHCT245PW/AUJ belongs to Nexperia's VHCT logic family, engineered specifically to replace legacy 74LS devices in 5 V systems while delivering CMOS power efficiency and enhanced noise immunity.
FAQ
What is the maximum supply voltage rating for the 74VHCT245PW/AUJ?
The 74VHCT245PW/AUJ has an absolute maximum supply voltage (VCC) of +7.0 V per IEC 60134 limiting values. However, its recommended operating range is strictly 4.5 V to 5.5 V. Operation above 5.5 V voids guaranteed performance and may cause accelerated parametric drift or latent failure, even if initial functionality appears normal.
Does the 74VHCT245PW/AUJ support hot-swap operation on live buses?
Yes, the 74VHCT245PW/AUJ supports controlled hot-swap via its active-low OE pin: asserting OE = HIGH places all A- and B-side outputs in high-impedance state before physical insertion, preventing bus contention. Its input overvoltage tolerance (up to 7.0 V) and ESD robustness (HBM > 2000 V) further enhance system resilience during live-connect events.
How does the DIR pin interact with the OE pin in the 74VHCT245PW/AUJ?
In the 74VHCT245PW/AUJ, OE is prioritized over DIR: when OE = HIGH, all outputs enter high-impedance regardless of DIR state. When OE = LOW, DIR determines direction - DIR = LOW enables A→B transfer, DIR = HIGH enables B→A transfer. This hierarchy ensures bus isolation takes precedence over data flow direction.
Can the 74VHCT245PW/AUJ interface directly with 3.3 V microcontrollers?
No - the 74VHCT245PW/AUJ requires a 4.5–5.5 V supply and is not 3.3 V tolerant on VCC. While its inputs accept up to 7.0 V, driving it from a 3.3 V microcontroller's GPIO will violate VIH minimum (2.0 V) under worst-case VCC = 4.5 V conditions. A level-shifting buffer or 5 V supply rail is mandatory for reliable operation.
What is the thermal pad on the bottom of the 74VHCT245PW/AUJ TSSOP package used for?
The exposed thermal pad on the 74VHCT245PW/AUJ (SOT360-1) is not electrically connected and serves only for thermal conduction. Per Nexperia documentation, it may remain floating or be soldered to a PCB thermal plane - but if connected, it must tie to GND to avoid parasitic coupling. No electrical function is assigned to this pad.
74VHCT245PW/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74VHCT
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHCT245PW/AUJ FAQ
1.How can I place an order for 74VHCT245PW/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT245PW/AUJ 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 74VHCT245PW/AUJ reliable?
The price and inventory of 74VHCT245PW/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT245PW/AUJ is usually 5 days.
3.What payment methods are accepted for 74VHCT245PW/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT245PW/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT245PW/AUJ?
74VHCT245PW/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT245PW/AUJ 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 74VHCT245PW/AUJ?
For technical support, including 74VHCT245PW/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT245PW/AUJ requirements.
6.How does Aetrix verify that 74VHCT245PW/AUJ is sourced from the original manufacturer or authorized distributors?
All 74VHCT245PW/AUJ 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 74VHCT245PW/AUJ meets industry standards.
7.What is the process for return or replacement of 74VHCT245PW/AUJ?
All 74VHCT245PW/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT245PW/AUJ, 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 74VHCT245PW/AUJ part is unused and in its original packaging.
Return procedure for 74VHCT245PW/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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