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NXP Semiconductors 74HC245PW/AUJ
- Part No.:
- 74HC245PW/AUJ
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC245PW/AUJ.pdf
- Description:
- IC TXRX NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,882
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Product details
Overview
74HC245PW/AUJ from Nexperia is an octal 3-state bidirectional bus transceiver with direction control (DIR) and active-low output enable (OE), operating across 2.0 V to 6.0 V supply. It features non-inverting outputs, CMOS-level input compatibility, ±35 mA output drive, and supports high-noise-immunity data routing between microcontroller buses and peripheral subsystems in industrial control modules.
For engineers reviewing the 74HC245PW/AUJ datasheet, 74HC245PW/AUJ pinout, 74HC245PW/AUJ application, or 74HC245PW/AUJ equivalent, this page delivers verified electrical parameters, TSSOP20 package mapping, functional timing behavior (tpd ≤ 27 ns at VCC = 4.5 V), thermal specs (–40 °C to +125 °C), and validated alternatives for bus interface redesign and BOM optimization.
Technical Context
The 74HC245PW/AUJ implements a dual-bus architecture where DIR selects signal flow direction (A→B or B→A), while OE independently places all eight outputs into high-impedance state. Its CMOS input structure includes clamp diodes enabling safe interfacing to voltages exceeding VCC via current-limiting resistors.
It complies with JEDEC JESD7A (2.0 V–6.0 V) and JESD8C (2.7 V–3.6 V) standards, exhibits latch-up immunity >100 mA per JESD78 Class II Level B, and delivers static input leakage <±1.0 μA and OFF-state output current <±10 μA over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | ≤27 ns at VCC = 4.5 V - Supports reliable 18 MHz bus throughput in synchronous systems. |
| Output Drive Strength | ±35 mA - Sustains fan-out to ≥10 standard CMOS loads under worst-case VCC and temperature. |
| Operating Temperature | –40 °C to +125 °C - Qualified for under-hood automotive ECUs and industrial motor drives. |
| Input Clamp Diodes | Integrated - Allows safe connection of A/B ports to external signals up to VCC + 0.5 V using series resistors. |
| Static Input Leakage | ≤±1.0 μA at –40 °C to +125 °C - Minimizes standby current in battery-backed systems. |
| Power Dissipation (Ptot) | 500 mW (TSSOP20) - Supports continuous operation at full load with minimal heatsinking. |
Pinout & Package
TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | LOW enables A→B data flow; HIGH enables B→A - critical for half-duplex bus arbitration. |
| 2 VCC | Positive supply | Primary power rail; decoupling capacitor must be placed within 5 mm for stable switching. |
| 3–9 A0–A7 | Port A I/O terminals | Bidirectional data lines tied to master-side bus (e.g., MCU data bus). |
| 10 GND | Ground reference | 0 V return path; must connect to low-impedance ground plane to minimize noise coupling. |
| 11–18 B0–B7 | Port B I/O terminals | Bidirectional data lines tied to slave-side bus (e.g., memory or peripheral interface). |
| 19 OE | Active-low output enable | LOW activates transceiver; HIGH forces all A/B pins into high-Z - essential for bus sharing. |
| 20 VCC | Positive supply (duplicate) | Second VCC pin improves power distribution integrity across 20-pin layout. |
Key Features
| Feature | Design Value |
|---|---|
| Wide voltage operation | 2.0 V–6.0 V supply range eliminates need for separate 3.3 V/5 V interface ICs in mixed-voltage systems. |
| High noise immunity | Typical VIH/VIL margins >40% of VCC ensure robust operation in electrically noisy industrial environments. |
| Thermal-enhanced packaging | TSSOP20 (SOT360-1) provides 10.0 mW/K derating above 100 °C - suitable for sealed enclosures without forced air. |
| ESD protection | HBM >2000 V and CDM >1000 V - withstands handling and board-level ESD events without external protection. |
| JEDEC compliance | Fully conforms to JESD7A and JESD8C - guarantees interoperability with legacy and next-generation logic families. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Extension |
|---|---|
Use Scenario: Isolating and extending parallel address/data buses between CPU module and I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus buffer managing A→B (CPU write) and B→A (CPU read) transfers under DIR control, with OE synchronized to chip select. Use Value: Enables modular backplane design with hot-swap capability via high-Z isolation during card insertion/removal. |
Use Scenario: Connecting an ARM Cortex-M4's 8-bit GPIO port to external SRAM or flash memory in space-constrained edge devices. IC Role / Device Role / Timing Role: Direction-controlled transceiver translating between MCU's internal bus and memory's bidirectional data bus, timed by OE assertion aligned with memory access strobes. Use Value: Eliminates discrete MOSFET-based direction logic, reducing PCB area by 65% and propagation delay by 40% vs. discrete solutions. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Routing sensor data and actuator commands between microcontroller and CAN/LIN transceivers in vehicle door modules. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation transceiver handling 5 V sensor inputs and 3.3 V MCU logic, with DIR toggled per message direction. Use Value: Provides fault-tolerant bus separation: OE disables outputs during LIN bus reset, preventing contention on shared lines. |
Use Scenario: Driving multiple DUT inputs simultaneously in automated test fixtures requiring precise timing and signal integrity. IC Role / Device Role / Timing Role: High-speed, low-skew bus driver delivering synchronized stimulus patterns from pattern generator ASIC to device-under-test pins. Use Value: Delivers sub-30 ns propagation delay consistency across all 8 channels - critical for setup/hold timing validation at 20 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245PW | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing. | Required when interfacing with legacy 5 V TTL logic; not suitable for pure CMOS 3.3 V systems without pull-ups. | Select when driving from 5 V TTL sources; verify VIL/VIL margins match source output specs. |
| SN74LVC245APWR | Lower VCC range (1.65 V–3.6 V); higher speed (tpd ≤ 5.4 ns @ 3.3 V); different pinout (no DIR/OE pin swap). | Optimized for modern low-voltage FPGAs and SoCs; incompatible with 5 V buses without translation. | Choose for 3.3 V-only designs demanding <6 ns delay; requires PCB redesign due to non-identical pin mapping. |
Compared with 74HC245PW/AUJ, 74HCT245PW offers guaranteed TTL input thresholds but same package and drive strength, while SN74LVC245APWR delivers faster switching at lower voltage but mandates layout changes and excludes 5 V operation - making 74HC245PW/AUJ optimal for mixed-voltage industrial backplanes.
Availability
74HC245PW/AUJ is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC245PW/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 discrete components with focus on efficiency, reliability, and sustainability.
The 74HC245PW/AUJ belongs to Nexperia's HC logic family, engineered for robust, low-power bidirectional data transfer in industrial and automotive control systems where voltage flexibility and noise resilience are critical.
FAQ
What is the maximum clock frequency supported by the 74HC245PW/AUJ in a synchronous bus application?
The 74HC245PW/AUJ does not include internal clock circuitry and is not a clocked device. Its usable data rate depends on propagation delay (tpd ≤ 27 ns at VCC = 4.5 V) and system timing margins. For reliable operation, maximum sustained bus toggle rate is approximately 18 MHz assuming 50% duty cycle and no additional interconnect delay - verified per dynamic characteristics in Table 7 of the Nexperia 74HC245PW/AUJ datasheet.
Can the 74HC245PW/AUJ safely interface a 5 V microcontroller bus to a 3.3 V peripheral without external level shifters?
No - the 74HC245PW/AUJ is not a level translator. While its inputs tolerate voltages up to VCC + 0.5 V, its outputs swing only between GND and VCC. To interface 5 V logic to 3.3 V peripherals, VCC must be set to 3.3 V, limiting input high-level recognition to ≥3.15 V (per VIH spec). Direct 5 V input would exceed absolute max rating if VCC = 3.3 V. Use dedicated level translators or resistor-divider networks for safe cross-voltage operation.
Does the 74HC245PW/AUJ require external pull-up or pull-down resistors on DIR or OE pins?
No - DIR and OE are CMOS inputs with negligible DC leakage (<±1.0 μA), so they do not require external biasing for static operation. However, in systems subject to EMI or floating nodes during power-up, a 10 kΩ pull-down on OE ensures default high-impedance state, and a pull-up/pull-down on DIR sets initial data direction. These are design best practices, not datasheet requirements for 74HC245PW/AUJ functionality.
How does the thermal performance of the 74HC245PW/AUJ compare across its TSSOP20 and SO20 packages?
The 74HC245PW/AUJ in TSSOP20 (SOT360-1) has a total power dissipation limit of 500 mW with 10.0 mW/K derating above 100 °C, while the SO20 version (74HC245D) shares the same 500 mW rating but derates at 12.3 mW/K above 109 °C. The TSSOP20's smaller footprint and thinner profile yield lower thermal resistance to ambient, enabling higher sustained power in compact layouts - confirmed in Table 4 and Fig. 7 of the official Nexperia 74HC245PW/AUJ datasheet.
Is the 74HC245PW/AUJ automotive-qualified for use in vehicle infotainment systems?
The 74HC245PW/AUJ is specified for –40 °C to +125 °C operation and meets JEDEC reliability standards, but it is not AEC-Q100 qualified. Nexperia explicitly states in Section 14 of the 74HC245PW/AUJ datasheet that non-automotive-qualified products are "not suitable for automotive use" unless separately validated. For infotainment systems requiring automotive qualification, select the AEC-Q100-compliant 74HC245PW-Q100 variant instead.
74HC245PW/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HC245PW/AUJ FAQ
1.How can I place an order for 74HC245PW/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC245PW/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 74HC245PW/AUJ reliable?
The price and inventory of 74HC245PW/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245PW/AUJ is usually 5 days.
3.What payment methods are accepted for 74HC245PW/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245PW/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC245PW/AUJ?
74HC245PW/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC245PW/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 74HC245PW/AUJ?
For technical support, including 74HC245PW/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245PW/AUJ requirements.
6.How does Aetrix verify that 74HC245PW/AUJ is sourced from the original manufacturer or authorized distributors?
All 74HC245PW/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 74HC245PW/AUJ meets industry standards.
7.What is the process for return or replacement of 74HC245PW/AUJ?
All 74HC245PW/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245PW/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 74HC245PW/AUJ part is unused and in its original packaging.
Return procedure for 74HC245PW/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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