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Nexperia USA Inc. 74HCT245PW,118
- Part No.:
- 74HCT245PW,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT245PW,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,995
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Product details
Overview
74HCT245PW,118 from Nexperia is an octal 3-state bidirectional bus transceiver with TTL-compatible inputs and non-inverting outputs, operating from 4.5 V to 5.5 V supply. It features direction control (DIR) and active-low output enable (OE), enabling high-impedance isolation of A- and B-side buses. Used in microcontroller peripheral interfacing, memory expansion, and level-shifting between 5 V logic domains.
For engineers reviewing the 74HCT245PW,118 datasheet, 74HCT245PW,118 pinout, 74HCT245PW,118 application, or 74HCT245PW,118 equivalent, this device supports precise bus arbitration in industrial control backplanes, legacy ISA-style expansion interfaces, and FPGA-to-microprocessor data path bridging where TTL-level compatibility and low propagation delay are required.
Technical Context
The 74HCT245PW,118 implements a dual-bus architecture with separate A- and B-side 8-bit I/O ports, controlled by DIR to determine data flow direction (A→B or B→A) and OE to place all outputs in high-impedance state. Its TTL-input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure reliable interfacing with standard 5 V TTL outputs without level translation.
Propagation delay is specified at 12 ns (typ) to 33 ns (max) across -40 °C to +125 °C for A↔B paths at VCC = 4.5 V, with enable/disable times ≤ 45 ns (max). Input clamping diodes allow safe interface to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in standard 5 V systems with ±5% tolerance. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees robust recognition of TTL logic levels without external biasing. |
| Propagation Delay | 12 ns (typ), 33 ns (max) at VCC = 4.5 V - Supports 20+ MHz bus clocking in synchronous data transfers. |
| Output Drive | ±6 mA at VCC = 4.5 V - Sufficient to drive 10 LSTTL loads or 15 pF capacitive loads directly. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive modules and industrial PLC I/O stages. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces risk of handling damage during PCB assembly and field service. |
| Power Dissipation | 250 mW max (TSSOP20 package) - Enables dense placement in space-constrained control boards without forced cooling. |
Pinout & Package
TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.
| 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. |
| 2–9 (A0–A7) | Port A bidirectional I/O | Connects to microcontroller or FPGA data bus; shares pins for input/output based on DIR state. |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers; must be low-impedance for noise immunity. |
| 11–18 (B0–B7) | Port B bidirectional I/O | Interfaces to peripheral devices (e.g., SRAM, EEPROM); electrically isolated from Port A when OE = HIGH. |
| 19 (OE) | Active-low output enable | Drives all A/B outputs to high-impedance when HIGH - essential for multi-master bus sharing. |
| 20 (VCC) | Positive supply | 5 V nominal power rail; decoupling capacitor (100 nF) required within 5 mm for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH/VIL thresholds match legacy 5 V TTL families - eliminates need for external level shifters in mixed-logic systems. |
| 3-state bus isolation | OE-controlled high-impedance outputs prevent bus contention during multi-device access - mandatory for shared data highways. |
| Wide temperature range | Specified from -40 °C to +125 °C - supports deployment in engine control units, motor drives, and outdoor telecom equipment. |
| Clamp diode protection | Integrated input diodes allow safe interface to signals up to VCC + 0.5 V using series resistors - simplifies overvoltage hardening. |
| Low dynamic power | CPD = 30 pF - limits switching current in high-frequency applications, reducing heat generation in TSSOP package. |
Applications
| Industrial PLC Backplane | Legacy PC Expansion Interface |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge between ARM Cortex-M7 host and isolated RS-485/relay driver modules. Use Value: DIR and OE enable deterministic bus ownership handoff with <33 ns latency, preventing race conditions during hot-swap events. |
Use Scenario: Interfacing modern FPGA-based ISA-compatible peripherals to vintage x86 embedded systems. IC Role / Device Role / Timing Role: Level-translating and direction-controlling data path between 5 V ISA bus and 3.3 V FPGA I/O banks. Use Value: TTL input thresholds ensure reliable sampling of ISA bus signals without external pull-ups; 3-state outputs prevent conflicts during DMA cycles. |
| FPGA-to-Microcontroller Bridge | Automotive Body Control Module |
Use Scenario: Connecting Xilinx Artix-7 FPGA configuration memory interface to external SPI flash and parallel EEPROM. IC Role / Device Role / Timing Role: Octal bus transceiver managing bidirectional data transfer between FPGA GPIO bank and memory device data lines. Use Value: 12 ns typical propagation delay allows tight timing closure for 25 MHz memory read/write operations. |
Use Scenario: Data routing between 5 V CAN transceiver and 3.3 V microcontroller in door module ECU. IC Role / Device Role / Timing Role: Isolating MCU data bus from CAN controller and LIN transceiver during sleep/wake transitions. Use Value: -40 °C to +125 °C rating ensures uninterrupted operation in cabin temperature extremes; OE pin enables low-power bus shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245PWR | TSSOP20 package, identical electrical specs, TI's version with different thermal derating (300 mW @ 100 °C). | Same functional behavior but requires validation of board-level thermal margin due to higher Ptot at elevated ambient. | Select if sourcing from TI-authorized channels; verify layout cooling matches Nexperia's 250 mW limit at 125 °C. |
| 74HCT245D,118 | SO20 package (SOT163-1), same logic and timing, but larger footprint (7.5 mm width) and lower thermal resistance (500 mW max). | Better suited for prototyping or low-volume industrial boards where manual soldering and thermal mass are advantageous. | Choose for through-hole-compatible reworkability or when board space permits wider SO package and higher power headroom. |
Compared with SN74HCT245PWR and 74HCT245D,118, the 74HCT245PW,118 offers optimal density for high-volume automotive and industrial PCBs, balancing thermal performance, footprint size, and proven reliability in 125 °C environments - making it preferred for space-constrained, thermally aggressive designs.
Availability
74HCT245PW,118 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body control modules, and FPGA peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT245PW,118 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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT245PW,118 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically for robust 5 V system interfacing with TTL compatibility, wide temperature operation, and enhanced ESD resilience.
FAQ
Can 74HCT245PW,118 operate at 3.3 V supply?
No. The 74HCT245PW,118 is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, VIH and VIL thresholds fall outside TTL compatibility, and output drive strength degrades significantly. Use 74LVC245 or 74ALVC245 for 3.3 V systems.
What is the maximum capacitive load the outputs can drive reliably?
The outputs are characterized up to 15 pF load capacitance with guaranteed timing (tpd ≤ 33 ns max at VCC = 4.5 V). Driving >15 pF increases propagation delay nonlinearly and may cause signal integrity issues; add series termination or buffer stages for heavier loads.
Is the GND pin (Pin 10) internally connected to the exposed thermal pad in TSSOP20?
No. The TSSOP20 package (SOT360-1) has no exposed thermal pad. Pin 10 is the sole GND connection. Unlike QFN variants, this package relies on lead-frame conduction; ensure solid copper pour under the entire footprint for thermal and EMI performance.
How does the DIR pin behave during power-up before VCC stabilizes?
DIR has no internal pull-up/down; its state is undefined until VCC reaches ~1.5 V. To prevent bus contention, tie DIR to a known state (e.g., via 10 kΩ resistor to GND or VCC) or synchronize it with reset assertion in the host system firmware.
74HCT245PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HCT245PW,118 FAQ
1.How can I place an order for 74HCT245PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245PW,118 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 74HCT245PW,118 reliable?
The price and inventory of 74HCT245PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245PW,118 is usually 5 days.
3.What payment methods are accepted for 74HCT245PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245PW,118?
74HCT245PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245PW,118 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 74HCT245PW,118?
For technical support, including 74HCT245PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245PW,118 requirements.
6.How does Aetrix verify that 74HCT245PW,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT245PW,118 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 74HCT245PW,118 meets industry standards.
7.What is the process for return or replacement of 74HCT245PW,118?
All 74HCT245PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245PW,118, 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 74HCT245PW,118 part is unused and in its original packaging.
Return procedure for 74HCT245PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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