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onsemi MC74HC245AFELG
- Part No.:
- MC74HC245AFELG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74HC245AFELG.pdf
- Description:
- IC TXRX NON-INVERT 6V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
MC74HC245AFELG 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, with 15 LSTTL load drive capability, propagation delay as low as 13 ns at 6.0 V, and bidirectional data flow controlled by Direction and active-low Output Enable pins. It enables asynchronous 2-way communication between data buses in industrial control backplanes and legacy microprocessor system expansion interfaces.
For engineers reviewing the MC74HC245AFELG datasheet, pinout, applications, or equivalent options, key selection criteria include voltage compatibility (2.0–6.0 V), 3-state isolation timing (tPLZ/tPHZ ≤ 19 ns at 6.0 V), direction-controlled bidirectional I/O, and SOIC-20 WB mechanical fit for board-level space-constrained upgrades of LS245-based systems.
Technical Context
The MC74HC245AFELG implements a silicon-gate CMOS architecture with identical pinout to TTL 74LS245, enabling drop-in replacement in legacy designs. Its dual-control logic-Direction (pin 1) and active-low Output Enable (pin 19)-fully decouples bus arbitration from data path, supporting independent enable/disable and direction reversal without bus contention.
All eight A-side and B-side I/Os are fully symmetrical and 3-state capable, with input thresholds compatible with standard CMOS outputs and external pull-up resistors enabling interoperability with LSTTL. The device exhibits high noise immunity (>40% VCC noise margin at 6.0 V) and meets JEDEC Std. No. 7A for commercial and industrial temperature ranges (−55°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay (A↔B) | 13 ns max at VCC = 6.0 V - enables reliable operation in 30 MHz+ bus cycles with margin |
| Output Drive Strength | 15 LSTTL loads - sufficient to drive multiple legacy TTL inputs without buffering |
| 3-State Leakage Current | ±10 µA max at 125°C - ensures robust high-impedance isolation under worst-case thermal stress |
| Input Capacitance | 10 pF max per pin - minimizes signal loading and preserves edge integrity on high-speed buses |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and automotive under-hood applications |
| ESD Withstand | >2000 V HBM - provides robust handling protection during PCB assembly and field service |
Pinout & Package
MC74HC245AFELG is housed in a SOIC-20 Wide Body (Case 751D) package measuring 12.8 mm × 7.5 mm × 2.5 mm, with 1.27 mm pitch, gull-wing leads, and Pb-free (RoHS-compliant) finish. Pin 10 is GND; Pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Direction Control (DIR) | Active-high logic input determining data flow direction: DIR = H → A→B; DIR = L → B→A |
| 2–9 | A-Side Data I/O (A1–A8) | Bidirectional data port A; high-impedance when OE = H or device powered down |
| 11–18 | B-Side Data I/O (B1–B8) | Bidirectional data port B; electrically identical to A-side with matched timing and drive |
| 19 | Output Enable (OE̅) | Active-low control: OE̅ = L enables transceiver; OE̅ = H places both A and B ports in high-Z |
| 10 | GND | Ground reference for all internal circuitry and I/O signaling |
| 20 | VCC | Positive supply rail; must be decoupled locally with 0.1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Pinout Compatibility | Identical to 74LS245 - enables direct PCB replacement without layout changes in legacy systems |
| CMOS Input Compatibility | Accepts standard CMOS output levels (VIH ≥ 1.5 V @ 2.0 V VCC); no external biasing required |
| LSTTL Interoperability | Supports LSTTL outputs via external pull-up resistors on inputs - verified up to 15 LSTTL loads |
| High-Noise Immunity | CMOS threshold symmetry and >40% VCC noise margin ensure reliable operation in electrically noisy industrial environments |
| Automotive Qualification | AEC-Q100 qualified (−Q suffix variants); MC74HC245AFELG shares same die and process - suitable for automotive body electronics |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and extending parallel address/data buses between PLC CPU modules and I/O carrier boards operating at different supply voltages. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A→B or B→A data flow under real-time direction control, with 3-state isolation during bus arbitration. Use Value: Enables mixed-voltage (3.3 V/5 V) backplane interoperability while maintaining <19 ns enable/disable transition times for deterministic cycle timing. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU by connecting external parallel SRAM and peripheral ASICs via shared 8-bit data bus. IC Role / Device Role / Timing Role: Level-shifting, direction-controlled buffer that synchronizes data transfers between MCU and memory/peripheral without contention. Use Value: Provides 15 LSTTL load drive and 10 pF input capacitance to preserve signal integrity across 10 cm traces at 25 MHz bus clock rates. |
| Legacy System Upgrade | Test Equipment Signal Routing |
|
Use Scenario: Replacing obsolete 74LS245 transceivers in aging test fixtures and instrumentation controllers requiring extended temperature support. IC Role / Device Role / Timing Role: Drop-in CMOS upgrade delivering lower power, wider voltage range, and −55°C to +125°C operation while retaining identical pinout and logic behavior. Use Value: Eliminates need for redesign or requalification; achieves >80% reduction in quiescent current (ICC ≤ 160 µA vs. ~30 mA for LS245) at 5 V. |
Use Scenario: Configurable signal routing matrix in automated test equipment (ATE), where multiple DUT interfaces share common stimulus/response lines. IC Role / Device Role / Timing Role: Programmable bidirectional switch enabling dynamic reconfiguration of signal paths under FPGA control via DIR and OE̅. Use Value: Supports sub-20 ns enable/disable transitions and ±10 µA leakage at 125°C - critical for maintaining channel isolation during multi-DUT parallel testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245N | Same HC logic family, identical electrical specs, but in PDIP-20 package (longer lead form, higher parasitic inductance) | Preferred for through-hole prototyping or legacy socketed systems; unsuitable for surface-mount production due to footprint mismatch | Select SN74HC245N only when manual assembly or socket compatibility is required; not recommended for new SMT designs. |
| MC74HC245ADWG | Same die, same SOIC-20 WB package, identical marking "HC245A", but without "FELG" suffix - RoHS-compliant, non-automotive grade | Valid for industrial and commercial applications; lacks AEC-Q100 qualification documentation and PPAP support required for automotive Tier-1 sourcing | Choose MC74HC245ADWG for cost-sensitive non-automotive programs; MC74HC245AFELG adds traceability and qualification assurance for automotive use cases. |
Compared with SN74HC245N and MC74HC245ADWG, the MC74HC245AFELG delivers identical core transceiver functionality in a surface-mount SOIC-20 WB package with full AEC-Q100 qualification, making it the sole option among the three for production automotive applications requiring PPAP compliance and extended temperature validation.
Availability
MC74HC245AFELG is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, legacy system upgrades, and test equipment signal routing requiring stable component supply across extended temperature and automotive-qualified lifecycles.
Supply support for MC74HC245AFELG 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC74HC245AFELG belongs to onsemi's high-performance HC logic family, designed specifically to replace legacy TTL devices with improved speed, lower power, and broader voltage operation while maintaining pin-for-pin compatibility.
FAQ
What is the maximum operating frequency supported by the MC74HC245AFELG?
The MC74HC245AFELG does not specify a maximum clock frequency directly, but its propagation delay (tPLH/tPHL) is 13 ns maximum at VCC = 6.0 V. This supports reliable bidirectional data transfer in bus systems with cycle times ≥26 ns, corresponding to effective throughput up to approximately 38 MHz in synchronous applications with setup/hold margin. Real-world performance depends on trace length, loading, and driver strength.
Can the MC74HC245AFELG interface directly with 3.3 V microcontrollers and 5 V peripherals?
Yes, the MC74HC245AFELG operates over 2.0 V to 6.0 V and accepts input voltages from 0 V to VCC. When powered at 3.3 V, it correctly interprets 5 V-tolerant inputs (via internal clamping diodes rated for ±20 mA), and its outputs swing rail-to-rail - enabling safe bidirectional level translation between 3.3 V and 5 V domains without external components.
Is the MC74HC245AFELG pin-compatible with the 74LS245?
Yes, the MC74HC245AFELG has identical pinout and logic function to the 74LS245, including Direction (pin 1), Output Enable (pin 19), A-side I/O (pins 2–9), B-side I/O (pins 11–18), GND (pin 10), and VCC (pin 20). This allows direct replacement in existing PCB layouts, though design review should confirm decoupling, fanout, and timing margins meet HC-family characteristics.
Does the MC74HC245AFELG require external pull-up resistors on its inputs?
External pull-ups are optional and only needed when interfacing with open-collector or LSTTL outputs that cannot drive CMOS-compatible high levels. The MC74HC245AFELG inputs are fully compatible with standard CMOS outputs (VIH ≥ 1.5 V @ 2.0 V), so pull-ups are unnecessary in CMOS-to-CMOS or HC-to-HC connections. They become essential only for LS-TTL source compatibility.
What is the significance of the "FELG" suffix in MC74HC245AFELG?
The "FELG" suffix indicates a specific onsemi packaging and compliance configuration: F = tape-and-reel packaging, E = SOIC-20 Wide Body (Case 751D), L = lead-free (Pb-free), and G = RoHS-compliant. It confirms the part meets JEDEC Std. No. 7A, AEC-Q100 qualification, and environmental requirements for automotive and industrial deployment.
MC74HC245AFELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- SOEIAJ-20
MC74HC245AFELG FAQ
1.How can I place an order for MC74HC245AFELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC245AFELG 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 MC74HC245AFELG reliable?
The price and inventory of MC74HC245AFELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC245AFELG is usually 5 days.
3.What payment methods are accepted for MC74HC245AFELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC245AFELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC245AFELG?
MC74HC245AFELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC245AFELG 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 MC74HC245AFELG?
For technical support, including MC74HC245AFELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC245AFELG requirements.
6.How does Aetrix verify that MC74HC245AFELG is sourced from the original manufacturer or authorized distributors?
All MC74HC245AFELG 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 MC74HC245AFELG meets industry standards.
7.What is the process for return or replacement of MC74HC245AFELG?
All MC74HC245AFELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC245AFELG, 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 MC74HC245AFELG part is unused and in its original packaging.
Return procedure for MC74HC245AFELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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