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onsemi MC74HC245ANG
- Part No.:
- MC74HC245ANG
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MC74HC245ANG.pdf
- Description:
- IC TXRX NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
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Product details
Overview
MC74HC245ANG from onsemi is an octal 3-state noninverting bus transceiver in a 20-pin SOIC package, operating across 2.0–6.0 V supply range, supporting bidirectional data flow between two 8-bit buses with active-low Output Enable and unidirectional Direction control. It delivers 15 LSTTL load drive capability and exhibits high noise immunity for industrial bus interfacing.
For engineers reviewing the MC74HC245ANG datasheet, pinout, applications, or equivalent options, key selection considerations include voltage compatibility (2.0–6.0 V), propagation delay (13–110 ns depending on VCC and temperature), 3-state leakage current (±10 µA max at 125°C), and SOIC-20W mechanical footprint per case 751D.
Technical Context
The MC74HC245ANG implements a silicon-gate CMOS architecture identical in pinout to LS245, enabling drop-in replacement in legacy TTL-based systems. Its dual control inputs-active-low Output Enable (/OE) and Direction (DIR)-determine whether data flows A→B or B→A, or isolates both ports into high-impedance states.
Input thresholds are CMOS-compatible (VIH = 3.15 V min at VCC = 4.5 V), and outputs drive directly into CMOS, NMOS, and TTL loads without level-shifting circuitry. The device supports full industrial temperature range (−55°C to +125°C) and meets JEDEC Std No. 7A for high-noise-immunity digital logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables operation from low-voltage microcontrollers up to 5 V legacy systems without external regulators. |
| Propagation Delay (A↔B) | 13 ns min / 110 ns max - Determines maximum synchronous bus clock rate; e.g., ≤7.7 MHz worst-case at 125°C with VCC = 2.0 V. |
| Output Drive Strength | 15 LSTTL loads - Sufficient to drive multiple legacy TTL inputs without buffering; verified at 6.0 mA sink/source. |
| 3-State Leakage Current | ±10 µA max at 125°C - Ensures minimal bus contention during high-impedance state in hot environments. |
| Input Capacitance | 10 pF max - Limits capacitive loading on driving sources, preserving signal integrity on fast edges. |
| Operating Temperature | −55°C to +125°C - Qualified for extended industrial and under-hood automotive applications. |
| ESD Rating | HBM >2000 V - Provides robust handling margin during PCB assembly and field service. |
Pinout & Package
MC74HC245ANG is housed in a 20-pin SOIC Wide Body (Case 751D) package measuring 12.8 mm × 7.5 mm × 2.5 mm, with 1.27 mm pitch and Pb-free finish (G suffix). Pin 1 is index-marked; Pin 10 = GND; Pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | /OE (Output Enable) | Active-low control: asserts low to enable I/O ports; high places all A/B pins in high-Z. |
| 2–9 | A1–A8 | Port A data inputs/outputs - Bidirectional I/O when /OE low; direction set by DIR pin. |
| 10 | GND | Ground reference for logic and power - Must be low-impedance connection to minimize noise coupling. |
| 11–18 | B1–B8 | Port B data inputs/outputs - Mirror A port behavior; data path determined by DIR state. |
| 19 | DIR (Direction) | High = A→B transfer; Low = B→A transfer - Sets unidirectional data flow path when /OE is active. |
| 20 | VCC | Positive supply rail - Must be decoupled locally with 0.1 µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| CMOS input compatibility | Accepts standard CMOS logic levels; external pull-ups allow direct interface to LSTTL outputs. |
| 3-state output control | Dual independent controls (/OE and DIR) enable flexible bus arbitration and multi-master topology support. |
| Wide supply range | 2.0–6.0 V operation allows use with 3.3 V microcontrollers and 5 V peripheral buses in same system. |
| High noise immunity | CMOS threshold design ensures ≥40% VCC noise margin, reducing susceptibility to EMI in noisy industrial environments. |
| Pb-free & RoHS compliant | Meets global environmental regulations; marked with "G" suffix and qualified per JESD22-A114A HBM ESD testing. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a modern 3.3 V ARM-based controller to a legacy 5 V parallel I/O backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-tolerant bus transceiver managing data flow between mismatched voltage domains while maintaining timing integrity. Use Value: Eliminates need for discrete level shifters; 13 ns propagation delay at 6.0 V enables ≤30 MHz burst transfers without timing violation. | Use Scenario: Extending address/data bus lines between two PCBs in a modular test equipment rack using ribbon cable. IC Role / Device Role / Timing Role: Octal buffer with 3-state control to isolate segments during hot-swap or configuration changes. Use Value: ±10 µA high-Z leakage ensures no unintended bus loading; SOIC-20W footprint fits standard 0.3″ DIP socket adapters. |
| Automotive Body Control Module | Embedded Data Acquisition Front-End |
Use Scenario: Isolating sensor interface bus from main MCU domain in AEC-Q100-compliant body control units. IC Role / Device Role / Timing Role: Direction-controlled transceiver routing CAN subsystem diagnostics data to flash programming port. Use Value: −55°C to +125°C rating supports under-hood deployment; /OE pin enables firmware-safe bus shutdown during reset sequences. | Use Scenario: Multiplexing analog front-end ADC results and digital control signals onto shared SPI-like parallel bus in portable instrumentation. IC Role / Device Role / Timing Role: Noninverting transceiver synchronizing burst-mode sensor readouts with host processor handshaking. Use Value: 15 LSTTL load drive supports daisy-chained FPGA I/O banks; 10 pF input capacitance preserves rise time on 20 MHz sampling clocks. |
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 logic function and pinout; TI part uses different internal layout and slightly higher ICC (max 160 µA vs 160 µA at 125°C, identical spec). | Identical SOIC-20 package; TI's version has tighter VOH/VOL tolerances at 4.5 V but lacks AEC-Q100 qualification. | Select SN74HC245N only if AEC-Q100 compliance is not required and TI's supply chain preference applies. |
| 74VHC245M | Higher speed (tPLH = 5.5 ns typ @ 5 V); lower drive (8 LSTTL loads); identical 2.0–5.5 V range and SOIC-20 footprint. | Better suited for high-frequency data capture where propagation delay dominates over drive strength. | Choose 74VHC245M when sub-10 ns timing is critical and bus loading is light; verify 8-load limit against target sink/source requirements. |
Compared with SN74HC245N and 74VHC245M, MC74HC245ANG offers AEC-Q100 qualification and guaranteed 15 LSTTL drive across full temperature range-making it preferred for automotive and harsh-environment industrial designs where reliability validation is mandatory.
Availability
MC74HC245ANG is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy bus extension, and embedded data acquisition front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HC245ANG 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 sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC74HC245ANG belongs to onsemi's high-performance HC logic family, designed specifically for robust, wide-voltage-range bus interfacing in mission-critical industrial and automotive control systems.
FAQ
What is the maximum operating temperature for MC74HC245ANG?
The MC74HC245ANG is rated for operation from −55°C to +125°C ambient temperature, validated per JEDEC standards and supported by full DC/AC electrical specifications across this range. This makes MC74HC245ANG suitable for under-hood automotive applications and high-temperature industrial enclosures where thermal derating of commercial-grade logic is unacceptable.
Does MC74HC245ANG support 3.3 V logic systems?
Yes, MC74HC245ANG fully supports 3.3 V operation: its recommended supply range includes 2.0–6.0 V, and input thresholds scale with VCC (e.g., VIH = 2.1 V min at VCC = 3.0 V). Outputs swing rail-to-rail, ensuring clean interfacing with 3.3 V microcontrollers and FPGAs without external level translation. MC74HC245ANG maintains specified propagation delay and drive strength at 3.3 V.
Is MC74HC245ANG pin-compatible with TTL 74LS245?
Yes, MC74HC245ANG is explicitly designed as a pinout-identical replacement for 74LS245, sharing identical SOIC-20 pin assignments, function table, and control signal behavior (/OE active-low, DIR unidirectional). However, MC74HC245ANG requires no external pull-ups for TTL compatibility and draws significantly less quiescent current (max 160 µA vs ~30 mA for LS245), simplifying thermal and power design.
What is the purpose of the Direction (DIR) pin on MC74HC245ANG?
The DIR pin on MC74HC245ANG determines the direction of data flow between Port A and Port B when Output Enable (/OE) is asserted low: DIR = high enables A→B transfer; DIR = low enables B→A transfer. This unidirectional control allows MC74HC245ANG to serve as a flexible bridge in systems requiring asymmetric data routing, such as memory-mapped I/O or diagnostic bus access paths.
Can MC74HC245ANG be used in automotive applications?
Yes, MC74HC245ANG is AEC-Q100 qualified (Grade 1, −40°C to +125°C ambient) and PPAP-capable when ordered with the −Q suffix (e.g., MC74HC245ADWR2G−Q). While MC74HC245ANG itself is the base industrial-grade variant, its design lineage and qualification path ensure functional equivalence and reliability validation for automotive body electronics, gateway modules, and chassis control units meeting ISO/TS 16949 requirements.
MC74HC245ANG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
MC74HC245ANG FAQ
1.How can I place an order for MC74HC245ANG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC245ANG 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 MC74HC245ANG reliable?
The price and inventory of MC74HC245ANG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC245ANG is usually 5 days.
3.What payment methods are accepted for MC74HC245ANG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC245ANG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC245ANG?
MC74HC245ANG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC245ANG 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 MC74HC245ANG?
For technical support, including MC74HC245ANG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC245ANG requirements.
6.How does Aetrix verify that MC74HC245ANG is sourced from the original manufacturer or authorized distributors?
All MC74HC245ANG 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 MC74HC245ANG meets industry standards.
7.What is the process for return or replacement of MC74HC245ANG?
All MC74HC245ANG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC245ANG, 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 MC74HC245ANG part is unused and in its original packaging.
Return procedure for MC74HC245ANG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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