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onsemi MC74HC245AFG
- Part No.:
- MC74HC245AFG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74HC245AFG.pdf
- Description:
- IC TXRX NON-INVERT 6V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
MC74HC245AFG from onsemi is an octal 3-state noninverting bus transceiver in a TSSOP-20 package, operating from 2.0 V to 6.0 V, with propagation delay ≤110 ns at 2.0 V and ±10 µA max input leakage current. It enables bidirectional data flow between two 8-bit buses using active-low Output Enable and Direction control pins, commonly used in microcontroller peripheral expansion and legacy bus interfacing.
For engineers reviewing the MC74HC245AFG datasheet, pinout, applications, or equivalent options, key selection considerations include voltage compatibility (2.0–6.0 V), 3-state output isolation timing (tPLZ/tPHZ ≤165 ns @125°C), direction-controlled bidirectional operation, and TSSOP-20 thermal performance (θJA = 150 °C/W).
Technical Context
The MC74HC245AFG implements a silicon-gate CMOS architecture with 308 FETs (77 equivalent gates), supporting asynchronous 2-way communication between data buses. Its logic diagram shows eight independent A↔B bidirectional channels, each controlled by shared Direction and Output Enable signals.
It features LSTTL-load drive capability (15 loads), high noise immunity, and JEDEC Std. No. 7A compliance. The device places all I/O ports into high-impedance state when Output Enable is high, and routes data either A→B (Direction = high) or B→A (Direction = low) when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Propagation Delay (A↔B) | ≤110 ns @2.0 V, –55°C to 25°C - ensures timing predictability in low-voltage embedded control paths. |
| Output Drive Strength | 15 LSTTL loads - directly drives legacy TTL peripherals without external buffers. |
| Input Leakage Current | ±1.0 µA max @125°C - minimizes standby current in thermally stressed industrial environments. |
| 3-State Leakage Current | ±10 µA max @125°C - maintains bus integrity during high-impedance isolation in multi-master systems. |
| Operating Temperature | –55°C to +125°C - qualified for automotive under-hood and industrial motor-control applications. |
| Package Thermal Resistance | θJA = 150 °C/W (TSSOP-20) - defines maximum power dissipation limit (833 mW) in still air at 25°C. |
Pinout & Package
TSSOP-20 (Case 948E), 0.65 mm pitch, 6.5 mm × 4.4 mm body, Pb-free, RoHS compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output Enable (active-low) | Assert low to enable transceiver; high forces all A/B I/Os into high-impedance state. |
| 2–9 | A1–A8 inputs/outputs | Port A data lines; direction determined by Pin 19; 3-state when OE high. |
| 10 | GND | Ground reference for all internal circuitry and I/O thresholds. |
| 11–18 | B1–B8 inputs/outputs | Port B data lines; complementary to A port; same 3-state behavior. |
| 19 | Direction control | High = A→B data flow; low = B→A data flow; no effect when OE high. |
| 20 | VCC | Positive supply rail (2.0–6.0 V); powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| CMOS input compatibility | Accepts standard CMOS outputs directly; external pull-ups enable LSTTL input compatibility. |
| Level translation support | Operates across 2.0–6.0 V, enabling voltage-domain bridging (e.g., 3.3 V MCU ↔ 5 V peripheral). |
| High noise immunity | CMOS threshold ratios (VIH ≥70% VCC, VIL ≤30% VCC) reject transient coupling in noisy industrial PCBs. |
| JEDEC Std. No. 7A compliance | Meets industry-standard timing, voltage, and interface requirements for interoperability with LS-family logic. |
| Pb-free & RoHS | Halogen-free construction and lead-free terminations meet global environmental compliance mandates. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Isolating and routing sensor data between multiple CAN microcontrollers and shared analog-to-digital converter resources on a modular I/O carrier board. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing time-critical 8-bit parallel data transfers between isolated subsystems under Direction and OE control. Use Value: Enables deterministic, low-latency (<110 ns @2.0 V) data handoff without bus contention, leveraging 3-state isolation during arbitration windows. |
Use Scenario: Interfacing a 3.3 V ARM-based main controller with legacy 5 V dashboard display drivers and EEPROMs in a centralized body control unit. IC Role / Device Role / Timing Role: Voltage-level translating transceiver providing bidirectional 8-bit data path between mismatched supply domains. Use Value: Eliminates need for discrete level-shifters while maintaining full 125°C operational margin and AEC-Q100-compliant reliability. |
| Embedded Test Equipment Data Capture | Legacy PC/104 Bus Expansion |
|
Use Scenario: Capturing parallel status signals from DUTs (device under test) running at varying supply voltages into a fixed 3.3 V FPGA acquisition engine. IC Role / Device Role / Timing Role: Configurable-direction transceiver synchronizing asynchronous DUT outputs to FPGA clock domain via controlled enable timing. Use Value: Provides precise tPLZ/tPHZ timing (≤165 ns @125°C) for setup/hold margining in high-speed digital test fixtures. |
Use Scenario: Extending ISA-compatible 8-bit data bus between stacked PC/104 modules where space-constrained layouts require TSSOP packaging. IC Role / Device Role / Timing Role: Pin-compatible replacement for 74LS245 in space-limited embedded computing stacks requiring low-power CMOS operation. Use Value: Delivers identical SOIC-20 pinout functionality in 40% smaller TSSOP-20 footprint (6.5 × 4.4 mm) without sacrificing drive strength or timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245PWR | Same HC logic family, 2.0–6.0 V, but TSSOP-20 package has θJA = 149 °C/W vs. MC74HC245AFG's 150 °C/W; identical AC/DC specs. | Designed for TI ecosystem designs; lacks AEC-Q100 qualification and automotive traceability markings. | Select when sourcing from TI-authorized channels and automotive qualification is not required. |
| 74LVC245APW,118 | Lower VCC range (1.65–3.6 V); 3.3 V optimized; tPLH ≤6.5 ns @3.3 V, but not rated beyond 125°C. | Targeted at modern low-voltage portable electronics; unsuitable for industrial temperature or mixed-voltage bus bridging. | Select only for 3.3 V-only systems requiring sub-7 ns propagation; avoid for >125°C or 5 V interface use. |
Compared with SN74HC245PWR and 74LVC245APW,118, the MC74HC245AFG uniquely combines extended temperature operation (–55°C to +125°C), AEC-Q100 qualification, and full 2.0–6.0 V flexibility-making it the sole choice for automotive and wide-temperature industrial bus isolation where reliability and voltage adaptability are mandatory.
Availability
MC74HC245AFG is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, and embedded test equipment requiring stable component supply across extended temperature ranges and mixed-voltage domains.
Supply support for MC74HC245AFG 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, sensors, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The MC74HC245AFG belongs to onsemi's high-performance HC logic family, designed specifically for robust, low-power bidirectional bus interfacing in harsh-environment applications demanding wide voltage range and extended temperature operation.
FAQ
What is the maximum operating temperature for the MC74HC245AFG?
The MC74HC245AFG is rated for continuous operation from –55°C to +125°C ambient temperature. This specification is validated per JEDEC standards and confirmed in the onsemi datasheet's Recommended Operating Conditions table. The MC74HC245AFG maintains full DC and AC performance across this full range, including leakage current and propagation delay limits, making it suitable for under-hood automotive and industrial motor-control environments.
Does the MC74HC245AFG support 3.3 V logic levels?
Yes, the MC74HC245AFG fully supports 3.3 V operation: its recommended VCC range includes 3.3 V (2.0–6.0 V), VIH is guaranteed ≥2.31 V at VCC = 3.3 V, and VOL remains ≤0.26 V at 2.4 mA sink current. The MC74HC245AFG is widely deployed in 3.3 V systems such as FPGA I/O expansion and ARM-based controllers interfacing with 5 V peripherals.
Is the MC74HC245AFG pin-compatible with the 74LS245?
Yes, the MC74HC245AFG is explicitly designed to be pinout-identical to the 74LS245, as stated in the onsemi datasheet: "MC74HC245A/MC74HCT245A is identical in pinout to the LS245." This applies to all 20 pins-including A/B port mapping, Direction, Output Enable, VCC, and GND-enabling direct drop-in replacement in legacy LS-based designs without PCB modification.
What is the meaning of the "FG" suffix in MC74HC245AFG?
The "FG" suffix in MC74HC245AFG indicates a TSSOP-20 package (Case 948E) with Pb-free (RoHS-compliant) finish and moisture sensitivity level 1. Per onsemi's ordering information table, "FG" corresponds to the MC74HC245ADTG variant, confirming the device is supplied in tape-and-reel format (2500 units) with standard marking "HC 245A" and halogen-free construction.
Can the MC74HC245AFG be used for level translation between 5 V and 3.3 V buses?
Yes, the MC74HC245AFG supports bidirectional level translation between 5 V and 3.3 V domains. When powered at 5 V, it accepts 3.3 V logic-high inputs (VIH min = 3.15 V at VCC = 5 V), and when powered at 3.3 V, its VOH exceeds 3.1 V at 2.4 mA load-ensuring reliable interfacing. The MC74HC245AFG achieves this without external components, leveraging its wide VCC range and CMOS input structure.
MC74HC245AFG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74HC245AFG FAQ
1.How can I place an order for MC74HC245AFG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC245AFG 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 MC74HC245AFG reliable?
The price and inventory of MC74HC245AFG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC245AFG is usually 5 days.
3.What payment methods are accepted for MC74HC245AFG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC245AFG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC245AFG?
MC74HC245AFG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC245AFG 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 MC74HC245AFG?
For technical support, including MC74HC245AFG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC245AFG requirements.
6.How does Aetrix verify that MC74HC245AFG is sourced from the original manufacturer or authorized distributors?
All MC74HC245AFG 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 MC74HC245AFG meets industry standards.
7.What is the process for return or replacement of MC74HC245AFG?
All MC74HC245AFG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC245AFG, 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 MC74HC245AFG part is unused and in its original packaging.
Return procedure for MC74HC245AFG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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