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onsemi MC74HCT244ADWR2
- Part No.:
- MC74HCT244ADWR2
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74HCT244ADWR2.pdf
- Description:
- IC BUF/DVR/RCR TRI-ST OCT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,661
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Product details
Overview
MC74HCT244ADWR2 from onsemi is an octal 3-state noninverting buffer/line driver with LSTTL-compatible inputs, designed for bus-oriented systems including memory address and clock distribution. It operates from 4.5 V to 5.5 V, delivers ±6 mA output drive per channel, supports –55°C to +125°C operation, and features dual active-low output enables (OE_A, OE_B) for independent group control.
For engineers reviewing the MC74HCT244ADWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state output timing (tPLZ = 26 ns max), LSTTL input compatibility (VIH = 2.0 V min), SOIC-20W package footprint, and automotive-grade availability via NLV variants.
Technical Context
The MC74HCT244ADWR2 implements eight noninverting buffer channels split into two groups of four (A1–A4 → YA1–YA4; B1–B4 → YB1–YB4), each controlled by a dedicated active-low enable (OE_A, OE_B). Its high-speed silicon-gate CMOS process ensures TTL/NMOS input compatibility while driving CMOS, NMOS, and TTL loads directly.
It meets JEDEC Standard No. 7A for HCT logic, supports 15 LSTTL load drive capability per output, and includes protection circuitry against static discharge. Input leakage is ≤±1.0 µA at 5.5 V, and three-state output leakage is ≤±10 µA over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across industrial and automotive 5 V rails |
| Propagation Delay (A→YA) | 30 ns max at 125°C - defines worst-case timing margin for high-speed bus buffering |
| Output Drive | ±6 mA at VOL ≤ 0.4 V - sufficient to drive 15 LSTTL loads without level-shifting circuitry |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable recognition of TTL/NMOS logic levels |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and under-hood automotive environments |
| 3-State Enable Delay | tPLZ = 39 ns max at 125°C - determines minimum time between enable assertion and valid output |
| Quiescent Current | ICC = 160 µA max at 125°C - enables low-static-power system-level power budgeting |
Pinout & Package
MC74HCT244ADWR2 is supplied in a 20-pin SOIC-20W (DW suffix, Case 751D) package with standard 0.3-inch body width and gull-wing leads. Pin pitch is 1.27 mm; package dimensions are 12.80 mm × 7.50 mm × 2.65 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE_A, OE_B | Active-low output enables for Group A (pins 2–5, 18–15) and Group B (pins 14–17, 9–6) |
| 2–5, 18–15 | A1–A4, YA1–YA4 | Noninverting input/output pair for first quad buffer group |
| 14–17, 9–6 | B1–B4, YB1–YB4 | Noninverting input/output pair for second quad buffer group |
| 10 | GND | Ground reference for all I/O and supply pins |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL-Compatible Inputs | Accepts standard TTL voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) without external level shifters |
| Dual Independent 3-State Enables | OE_A and OE_B allow selective disabling of two separate 4-bit data paths on shared buses |
| High-Drive Output Capability | Delivers ±6 mA per output - drives 15 LSTTL loads directly, reducing need for additional buffers |
| Wide Temperature Range | Specified from –55°C to +125°C - supports deployment in harsh industrial and automotive ECUs |
| Pb-Free & RoHS Compliant | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Driving multiplexed address lines from a microcontroller to multiple SRAM or Flash devices sharing a common data/address bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating and strengthening address signals; OE_A/OE_B synchronized with chip select decoding. Use Value: Prevents bus contention during memory access arbitration; 30 ns propagation delay ensures setup/hold timing compliance at 20 MHz bus clocks. | Use Scenario: Expanding GPIO count of an MCU by interfacing parallel peripherals (e.g., LCD controllers, ADCs, DACs) via shared 8-bit data bus. IC Role / Device Role / Timing Role: Bidirectional-capable line driver enabling read/write direction control through OE_A/OE_B timing relative to RD/WR strobes. Use Value: Eliminates need for discrete transceivers; ±6 mA drive sustains signal integrity across 10 cm PCB traces loaded with 3–5 peripheral inputs. |
| Industrial PLC Backplane Interface | Automotive Powertrain Sensor Hub |
Use Scenario: Level-translating and buffering digital I/O signals between legacy TTL-based I/O modules and modern CMOS-based controller cards in modular PLC racks. IC Role / Device Role / Timing Role: Voltage-level translator and noise-immune bus repeater; dual enables support hot-swap isolation of module groups. Use Value: Tolerates –55°C to +125°C ambient; 2.0 V VIH threshold reliably captures degraded TTL outputs from aging field modules. | Use Scenario: Aggregating and conditioning digital sensor outputs (e.g., crankshaft position, camshaft sync, knock detection) before routing to engine control unit (ECU) inputs. IC Role / Device Role / Timing Role: Robust input buffer with ESD-protected LSTTL inputs; OE_B used to gate sensor data during diagnostic self-test sequences. Use Value: AEC-Q100 qualified NLV variants available; 0.8 V VIL threshold rejects EMI-induced glitches below logic low threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244N | Dual 4-bit enables; identical AC/DC specs; PDIP-20 package only | No surface-mount option; higher thermal resistance limits high-density board use | Select when through-hole prototyping or legacy DIP socket compatibility is required |
| 74HCT244PW | Same logic function; TSSOP-20 package; slightly higher tPLH (33 ns max at 125°C) | Smaller footprint (6.5 × 4.4 mm) but lower thermal mass; not qualified for automotive temp range | Select for space-constrained consumer designs where AEC-Q100 qualification is unnecessary |
Compared with SN74HCT244N and 74HCT244PW, the MC74HCT244ADWR2 offers SOIC-20W packaging optimized for automated assembly, full –55°C to +125°C operation, and direct drop-in replacement for LS244 in legacy upgrades - making it preferred for industrial control and automotive subsystems requiring long-term reliability and thermal robustness.
Availability
MC74HCT244ADWR2 is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, and industrial PLC backplane interface requiring stable component supply, long-lifecycle support, and automotive-grade temperature resilience.
Supply support for MC74HCT244ADWR2 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HCT244ADWR2 belongs to onsemi's HCT logic family - engineered for seamless TTL-to-CMOS interfacing in high-reliability systems where LSTTL compatibility, wide temperature operation, and 3-state bus control are essential.
FAQ
What is the maximum operating temperature for MC74HCT244ADWR2?
The MC74HCT244ADWR2 is fully specified from –55°C to +125°C across all electrical parameters, including propagation delay, output drive, and leakage current. This rating applies to the SOIC-20W package under recommended operating conditions and makes the device suitable for under-hood automotive and industrial control applications where ambient temperatures exceed 100°C.
Does MC74HCT244ADWR2 support true bidirectional data flow?
No, the MC74HCT244ADWR2 is a unidirectional noninverting buffer with fixed input (A1–A4, B1–B4) and output (YA1–YA4, YB1–YB4) pin assignments. While its 3-state outputs allow bus sharing, it lacks internal direction control or data path reversal logic. For bidirectional operation, a dedicated transceiver such as the MC74HCT245A must be used instead of MC74HCT244ADWR2.
What is the purpose of the two separate output enables (OE_A and OE_B) on MC74HCT244ADWR2?
The MC74HCT244ADWR2 uses OE_A to control the YA1–YA4 outputs and OE_B to control the YB1–YB4 outputs, enabling independent gating of two 4-bit data groups. This allows partial bus isolation - for example, holding one memory bank's address lines active while tri-stating another - without requiring additional logic or external demultiplexing circuitry around the MC74HCT244ADWR2.
Can MC74HCT244ADWR2 be used as a level shifter between 3.3 V and 5 V systems?
No, the MC74HCT244ADWR2 requires a 4.5–5.5 V VCC supply and is not rated for 3.3 V operation. Its LSTTL-compatible inputs accept 2.0 V as VIH minimum, but the outputs swing rail-to-rail (0 V to VCC), so driving a 3.3 V system directly risks overvoltage damage. For 3.3 V ↔ 5 V translation, a dedicated level shifter like the TXB0108 or MC74VHC245 should be used instead of MC74HCT244ADWR2.
Is MC74HCT244ADWR2 pin-compatible with the original 74LS244?
Yes, the MC74HCT244ADWR2 is explicitly designed as a pinout-identical replacement for the 74LS244, with matching pin assignments for inputs, outputs, enables, VCC, and GND. This allows direct drop-in substitution in existing LS244-based designs, providing improved noise immunity, lower power consumption, and wider temperature range without PCB layout changes - a key advantage of the MC74HCT244ADWR2 in legacy system upgrades.
MC74HCT244ADWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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-SOIC
MC74HCT244ADWR2 FAQ
1.How can I place an order for MC74HCT244ADWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT244ADWR2 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 MC74HCT244ADWR2 reliable?
The price and inventory of MC74HCT244ADWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT244ADWR2 is usually 5 days.
3.What payment methods are accepted for MC74HCT244ADWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT244ADWR2 transactions.
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4.How is shipping managed for MC74HCT244ADWR2?
MC74HCT244ADWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT244ADWR2 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 MC74HCT244ADWR2?
For technical support, including MC74HCT244ADWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT244ADWR2 requirements.
6.How does Aetrix verify that MC74HCT244ADWR2 is sourced from the original manufacturer or authorized distributors?
All MC74HCT244ADWR2 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 MC74HCT244ADWR2 meets industry standards.
7.What is the process for return or replacement of MC74HCT244ADWR2?
All MC74HCT244ADWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT244ADWR2, 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 MC74HCT244ADWR2 part is unused and in its original packaging.
Return procedure for MC74HCT244ADWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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