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onsemi MC74HC245ADW
- Part No.:
- MC74HC245ADW
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74HC245ADW.pdf
- Description:
- IC BUS/TXRX NONINV OCT 20-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,305
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Product details
Overview
MC74HC245ADW from onsemi is an octal 3-state noninverting bus transceiver in SOIC-20 wide-body package, operating from 2.0 V to 6.0 V supply, with 15 LSTTL load drive capability, propagation delay as low as 13 ns at 6.0 V, and AEC-Q100 qualified −Q variant support for automotive data bus isolation and bidirectional level translation.
For engineers reviewing the MC74HC245ADW datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-direction control via DIR pin, active-low Output Enable (OE), CMOS/TTL interoperability, high-noise-immunity operation across −55°C to +125°C, and SOIC-20 pin compatibility with LS245.
Technical Context
The MC74HC245ADW implements a silicon-gate CMOS octal transceiver with independent direction (DIR) and output enable (OE) controls, enabling asynchronous 2-way communication between two 8-bit data buses. Its inputs are compatible with standard CMOS outputs and-when pulled up-interoperate with LSTTL logic levels.
It features true 3-state outputs with leakage current ≤±10 µA at 125°C, input capacitance ≤10 pF, and output transition time ≤15 ns at 6.0 V. The device supports hot-swap capable high-impedance isolation when OE is high, and meets JEDEC Std. No. 7A for CMOS interface compliance.
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 systems without level shifters |
| Propagation Delay (A↔B) | 13 ns max at VCC = 6.0 V - supports >30 MHz bus toggle rates in high-speed digital backplanes |
| Output Drive Strength | 15 LSTTL loads - sufficient to drive multiple legacy TTL inputs without buffering |
| Operating Temperature | −55°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Input Leakage Current | ±1.0 µA max at 125°C - ensures stable logic thresholds in low-power standby modes |
| 3-State Leakage Current | ±10 µA max at 125°C - prevents unintended bus contention during high-impedance isolation |
| ESD Withstand Voltage | Human Body Model >2000 V - provides robust handling margin in manual assembly and field service |
Pinout & Package
MC74HC245ADW is housed in a SOIC-20 wide-body (Case 751D) package with 1.27 mm pitch, 12.8 mm × 7.5 mm body size, and Pb-free, RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: drives all A/B I/Os into high-impedance state when high |
| 2–9 | A1–A8 | Port A data inputs/outputs - bidirectionally connected to first 8-bit bus |
| 10 | GND | Ground reference for logic and power domains |
| 11–18 | B1–B8 | Port B data inputs/outputs - bidirectionally connected to second 8-bit bus |
| 19 | DIR (Direction Control) | High = A→B data flow; Low = B→A data flow - determines transceiver directionality |
| 20 | VCC | Positive supply rail - powers internal CMOS logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Octal bidirectional data path | Enables full 8-bit parallel bus bridging between isolated subsystems without external routing logic |
| CMOS/TTL interoperability | Accepts LSTTL inputs via external pull-ups and directly interfaces CMOS/NMOS outputs - eliminates discrete level-shifting components |
| JEDEC Std. No. 7A compliance | Guarantees interoperability with industry-standard CMOS timing and voltage thresholds |
| AEC-Q100 qualification (−Q variant) | Validated for automotive applications including engine control modules and body electronics requiring PPAP documentation |
| Low dynamic power consumption | CPD = 40 pF per channel - reduces switching noise and thermal load in dense PCB layouts |
Applications
| Industrial PLC Backplane Interface | Automotive CAN Gateway Data Buffering |
|---|---|
|
Use Scenario: Isolating CPU and I/O module address/data buses in modular programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing 8-bit parallel data exchange between master controller and distributed I/O cards. Use Value: Enables hot-swappable I/O modules by placing ports in high-impedance state during insertion/removal, preventing bus contention. |
Use Scenario: Buffering diagnostic data between 5 V microcontroller and 3.3 V CAN transceiver in vehicle gateway ECUs. IC Role / Device Role / Timing Role: Level-translating and direction-controlled data bridge between MCU GPIO port and CAN controller interface. Use Value: Eliminates need for discrete MOSFET translators while supporting simultaneous read/write operations across voltage domains. |
| Legacy Instrumentation Bus Extender | Embedded Test Equipment Signal Routing |
|
Use Scenario: Extending TTL-compatible 8-bit data paths across long PCB traces in benchtop test instruments. IC Role / Device Role / Timing Role: Active repeater and fan-out driver for maintaining signal integrity on extended parallel buses. Use Value: Provides 15 LSTTL load drive and <15 ns transition time to restore edge fidelity degraded by trace capacitance. |
Use Scenario: Dynamically reconfiguring signal paths between DUT interface connectors and FPGA-based measurement logic. IC Role / Device Role / Timing Role: Programmable bidirectional switch matrix element controlled via FPGA GPIO pins. Use Value: DIR and OE pins allow FPGA to arbitrate data flow direction and isolate unused paths - reducing crosstalk and power leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245N | Same HC logic family, identical pinout, but PDIP-20 package and non-automotive qualification | Lacks AEC-Q100 qualification and SOIC-20 thermal performance; not rated for −55°C operation | Select when cost-sensitive prototyping or through-hole assembly is required and automotive temperature range is unnecessary |
| MC74HC245ADTG | TSSOP-20 package (7.0 mm × 4.4 mm), same electrical specs, identical −Q automotive option available | Smaller footprint and lower profile - suited for space-constrained PCBs but requires finer-pitch reflow process | Select for compact consumer or portable electronics where board area is constrained and SOIC-20 is too large |
Compared with SN74HC245N and MC74HC245ADTG, the MC74HC245ADW offers optimal thermal dissipation (96°C/W θJA) and mechanical robustness in SOIC-20 wide-body format, making it preferred for industrial control and automotive under-hood deployments where reliability under thermal stress is critical.
Availability
MC74HC245ADW is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive gateway modules, and embedded instrumentation requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MC74HC245ADW 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HC245ADW belongs to onsemi's high-performance HC logic family, designed specifically for robust, low-power bidirectional bus interfacing in harsh-environment systems requiring extended temperature operation and automotive qualification.
FAQ
What is the maximum operating frequency supported by the MC74HC245ADW?
The MC74HC245ADW does not specify a clock frequency but supports data transfer rates determined by its propagation delay and transition time. With tPLH/tPHL ≤13 ns at 6.0 V and tTLH/tTHL ≤15 ns, the MC74HC245ADW reliably handles bus toggle frequencies exceeding 30 MHz in point-to-point configurations, assuming proper termination and layout.
Does the MC74HC245ADW support mixed-voltage operation between Port A and Port B?
No - the MC74HC245ADW has a single VCC pin (Pin 20) powering both ports. It does not support independent voltage domains on A and B sides. However, its wide 2.0–6.0 V supply range allows interoperability with 3.3 V and 5 V systems when both ports share the same VCC rail.
Is the MC74HC245ADW pin-compatible with the 74LS245?
Yes - the MC74HC245ADW is explicitly designed as a drop-in replacement for the 74LS245, sharing identical pinout, function table, and logic behavior. Its CMOS construction delivers lower power, higher noise immunity, and wider supply voltage range while maintaining LS245-level drive strength (15 LSTTL loads).
What is the purpose of the −Q suffix in MC74HC245ADWR2G−Q*?
The −Q suffix denotes AEC-Q100 qualification and PPAP capability for automotive applications. The MC74HC245ADWR2G−Q* variant undergoes additional stress testing, lot traceability, and change control per automotive quality standards - distinct from the standard MC74HC245ADWR2G.
Can the MC74HC245ADW be used without external pull-up resistors on TTL inputs?
Yes - the MC74HC245ADW inputs are compatible with standard CMOS outputs without pull-ups. For direct connection to LSTTL outputs, external pull-up resistors are required to ensure VIH ≥1.5 V at VCC = 2.0 V, as specified in the DC Electrical Characteristics table.
MC74HC245ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74HC245ADW FAQ
1.How can I place an order for MC74HC245ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC245ADW 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 MC74HC245ADW reliable?
The price and inventory of MC74HC245ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC245ADW is usually 5 days.
3.What payment methods are accepted for MC74HC245ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC245ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC245ADW?
MC74HC245ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC245ADW 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 MC74HC245ADW?
For technical support, including MC74HC245ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC245ADW requirements.
6.How does Aetrix verify that MC74HC245ADW is sourced from the original manufacturer or authorized distributors?
All MC74HC245ADW 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 MC74HC245ADW meets industry standards.
7.What is the process for return or replacement of MC74HC245ADW?
All MC74HC245ADW units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC245ADW, 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 MC74HC245ADW part is unused and in its original packaging.
Return procedure for MC74HC245ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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