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onsemi MC74HCT245ADTR2G-Q
- Part No.:
- MC74HCT245ADTR2G-Q
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74HCT245ADTR2G-Q.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,602
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Product details
Overview
MC74HCT245ADTR2G-Q from onsemi is an octal 3-state noninverting bus transceiver designed for bidirectional asynchronous data bus communication in automotive-grade systems. It operates at 4.5–5.5 V, features active-low Output Enable and unidirectional Direction control, delivers ±6 mA output drive, and supports AEC-Q100 qualification for under-hood engine control modules.
For engineers reviewing the MC74HCT245ADTR2G-Q datasheet, pinout, applications, or equivalent options, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min), propagation delay ≤33 ns at 125°C, high-impedance leakage <±10 µA, and TSSOP-20 packaging for space-constrained PCB layouts.
Technical Context
The MC74HCT245ADTR2G-Q implements dual 8-bit bidirectional data paths controlled by separate Direction and Output Enable inputs. Its HCT logic family ensures TTL-level input compatibility while driving CMOS/NMOS/TTL loads-enabling level translation between legacy TTL peripherals and modern high-speed CMOS buses.
It uses silicon-gate CMOS technology with 308 FETs (77 equivalent gates), achieves 15 LSTTL load drive capability, and maintains stable operation across −55°C to +125°C ambient temperature per AEC-Q100 Grade 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures interoperability with standard 5 V TTL and microcontroller I/O rails without level-shifting circuitry. |
| Propagation Delay (A↔B) | ≤33 ns at 125°C - Guarantees timing margin for 20 MHz bus operation in high-temperature automotive environments. |
| Output Drive | ±6.0 mA at VCC = 4.5 V - Sufficient to directly drive 15 LSTTL loads or interface with standard CMOS/NMOS inputs. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Matches TTL logic levels, eliminating need for external pull-ups when interfacing with 74LS/ALS devices. |
| Three-State Leakage | ±10 µA max at 125°C - Prevents signal corruption during bus isolation in multi-master systems. |
| Operating Temperature | −55°C to +125°C - Validated for under-hood engine control units, transmission controllers, and ADAS sensor hubs. |
| ESD Rating | HBM >2000 V - Provides robustness against handling and assembly electrostatic discharge events. |
Pinout & Package
TSSOP-20 package (Case 948E), 6.5 mm × 4.4 mm footprint, 0.65 mm pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Direction Control (DIR) | Active-high signal selecting data flow direction: DIR = H → A→B; DIR = L → B→A. |
| 2–9 | Port A I/O (A1–A8) | Bidirectional data lines connected to local bus or microcontroller port; high-impedance when OE = H. |
| 10 | GND | Power ground reference for all internal logic and I/O stages. |
| 11–18 | Port B I/O (B1–B8) | Bidirectional data lines connected to remote bus or peripheral; isolated when OE = H. |
| 19 | Output Enable (OE̅) | Active-low control enabling/disabling both ports simultaneously into high-impedance state. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts standard 5 V TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), enabling direct connection to legacy LS/ALS logic without pull-up resistors. |
| High-Noise Immunity | CMOS architecture provides >40% noise margin at VCC = 5 V, ensuring reliable operation in electrically noisy automotive powertrain environments. |
| Low Quiescent Current | ICC ≤ 160 µA max at 125°C - minimizes standby power in always-on vehicle networks like CAN gateway modules. |
| AEC-Q100 Qualified | Qualified to Grade 1 (−40°C to +125°C ambient) with PPAP documentation support - meets OEM requirements for production automotive ECUs. |
| Small-Package Bus Interface | TSSOP-20 footprint saves >40% board area vs. SOIC-20, critical for compact ADAS camera modules and body control units. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Isolating diagnostic CAN controller from main ECU microcontroller during firmware updates. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between microcontroller GPIO port and CAN transceiver PHY layer. Use Value: Enables hot-swappable firmware loading without disrupting real-time engine timing signals via independent OE̅ and DIR control. | Use Scenario: Interfacing LIN master MCU with multiple slave sensors (door locks, window motors, lighting). IC Role / Device Role / Timing Role: Level-translating buffer between 3.3 V MCU I/O and 5 V LIN physical layer peripherals. Use Value: Eliminates discrete level-shifters using native TTL-compatible inputs and 5 V-tolerant outputs. |
| Advanced Driver Assistance Systems (ADAS) | Infotainment Head Unit |
Use Scenario: Sharing image data between radar processor and vision SoC over parallel LVCMOS bus. IC Role / Device Role / Timing Role: High-speed bidirectional data conduit synchronizing time-critical sensor fusion pipelines. Use Value: 33 ns max propagation delay at 125°C ensures sub-microsecond latency for real-time object detection processing. | Use Scenario: Expanding GPIO count of infotainment MCU to drive display backlight PWM and audio codec control lines. IC Role / Device Role / Timing Role: Octal I/O expander providing additional 8-bit parallel control path with 3-state isolation. Use Value: Reduces BOM cost versus dedicated I/O expanders by leveraging existing bus infrastructure and low-pin-count TSSOP package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245PWR | Same logic function, 4.5–5.5 V supply, but rated only to 85°C ambient; not AEC-Q100 qualified. | Suitable for industrial control panels or consumer electronics, not automotive under-hood use. | Select when cost sensitivity outweighs automotive qualification requirements and thermal environment remains <85°C. |
| 74LVC245AT20 | Lower voltage range (1.65–3.6 V), higher speed (tPD ≤ 5.5 ns), but lacks TTL input compatibility and AEC-Q100 certification. | Optimized for battery-powered portable devices and low-voltage FPGA interfaces, not 5 V legacy system integration. | Choose for ultra-low-power, high-speed 3.3 V systems where TTL interfacing is unnecessary. |
Compared with SN74HCT245PWR and 74LVC245AT20, the MC74HCT245ADTR2G-Q uniquely combines automotive-grade temperature range, AEC-Q100 qualification, and native TTL input compatibility in a space-saving TSSOP-20 package-making it the sole option for production automotive bus isolation where reliability and legacy interoperability are mandatory.
Availability
MC74HCT245ADTR2G-Q is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS sensor fusion systems requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for MC74HCT245ADTR2G-Q 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 manufacturer specializing in energy-efficient and intelligent power solutions for automotive, industrial, cloud, and IoT applications.
The MC74HCT245ADTR2G-Q belongs to onsemi's high-reliability logic portfolio, engineered specifically for automotive subsystems requiring AEC-Q100 compliance, robust noise immunity, and seamless TTL-to-CMOS interfacing in harsh operating environments.
FAQ
What is the maximum operating temperature for the MC74HCT245ADTR2G-Q?
The MC74HCT245ADTR2G-Q is rated for operation from −55°C to +125°C ambient temperature and is AEC-Q100 Grade 1 qualified. This specification ensures reliable functionality in under-hood automotive applications such as engine control units and transmission control modules where sustained high-temperature exposure occurs. The device's thermal resistance (θJA = 150°C/W in TSSOP-20) and guaranteed AC/DC parameters at 125°C confirm its suitability for these demanding conditions.
Does the MC74HCT245ADTR2G-Q require external pull-up resistors on its inputs?
No, the MC74HCT245ADTR2G-Q does not require external pull-up resistors on its inputs. Its HCT logic family features TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), allowing direct interfacing with standard 5 V TTL outputs like 74LS and 74ALS devices. This eliminates the need for pull-up components and simplifies schematic design in mixed-logic systems.
Can the MC74HCT245ADTR2G-Q be used as a level shifter between 3.3 V and 5 V domains?
The MC74HCT245ADTR2G-Q is not recommended as a bidirectional level shifter between 3.3 V and 5 V domains. Its inputs are TTL-compatible but not 3.3 V tolerant, and its outputs swing rail-to-rail within the 4.5–5.5 V supply range. For 3.3 V ↔ 5 V translation, dedicated level-shifting ICs such as the TXS0108E or discrete solutions with appropriate voltage clamping should be used instead of the MC74HCT245ADTR2G-Q.
What is the purpose of the Direction (DIR) and Output Enable (OE̅) pins on the MC74HCT245ADTR2G-Q?
The Direction (DIR) pin controls data flow direction: when DIR = HIGH, data passes from Port A to Port B; when DIR = LOW, data flows from Port B to Port A. The active-low Output Enable (OE̅) pin places both ports into high-impedance state when asserted (OE̅ = LOW disables outputs). These independent controls allow flexible bus arbitration and isolation in multi-master systems, and are essential for implementing protocols like JTAG boundary scan or shared memory access in the MC74HCT245ADTR2G-Q.
Is the MC74HCT245ADTR2G-Q pin-compatible with the standard 74LS245?
Yes, the MC74HCT245ADTR2G-Q is pin-compatible with the 74LS245, as explicitly stated in the datasheet: "MC74HC245A/MC74HCT245A is identical in pinout to the LS245." This includes matching pin assignments for A1–A8, B1–B8, DIR, OE̅, GND, and VCC across all packages-including the TSSOP-20 variant of the MC74HCT245ADTR2G-Q-enabling drop-in replacement in legacy designs upgrading from bipolar TTL to CMOS-based transceivers.
MC74HCT245ADTR2G-Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- HCT
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MC74HCT245ADTR2G-Q FAQ
1.How can I place an order for MC74HCT245ADTR2G-Q through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT245ADTR2G-Q 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 MC74HCT245ADTR2G-Q reliable?
The price and inventory of MC74HCT245ADTR2G-Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT245ADTR2G-Q is usually 5 days.
3.What payment methods are accepted for MC74HCT245ADTR2G-Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT245ADTR2G-Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT245ADTR2G-Q?
MC74HCT245ADTR2G-Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT245ADTR2G-Q 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 MC74HCT245ADTR2G-Q?
For technical support, including MC74HCT245ADTR2G-Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT245ADTR2G-Q requirements.
6.How does Aetrix verify that MC74HCT245ADTR2G-Q is sourced from the original manufacturer or authorized distributors?
All MC74HCT245ADTR2G-Q 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 MC74HCT245ADTR2G-Q meets industry standards.
7.What is the process for return or replacement of MC74HCT245ADTR2G-Q?
All MC74HCT245ADTR2G-Q units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT245ADTR2G-Q, 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 MC74HCT245ADTR2G-Q part is unused and in its original packaging.
Return procedure for MC74HCT245ADTR2G-Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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