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onsemi MC74VHC244MELG
- Part No.:
- MC74VHC244MELG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74VHC244MELG.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:2,574
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Product details
Overview
MC74VHC244MELG from onsemi is an advanced high-speed CMOS octal noninverting 3-state bus buffer with dual active-low output enables (OEA, OEB), designed for memory address/data bus driving in 2.0–5.5 V systems. It features 3.8 ns typical propagation delay at 5.0 V, ±25 mA output drive per pin, 4 pF max input capacitance, and 5.5 V tolerant inputs enabling 3 V/5 V level translation.
For engineers reviewing the MC74VHC244MELG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-20 package mapping, functional role in bidirectional bus isolation, and validated alternatives for industrial control, embedded interface, and legacy system upgrades.
Technical Context
The MC74VHC244MELG implements a three-stage silicon-gate CMOS architecture with buffered outputs to ensure high noise immunity (VNIH/VNIL = 28%) and stable switching. Its dual independent enable logic allows selective activation of two 4-bit groups (A→YA and B→YB), supporting partial bus gating without full channel disable.
Input structures tolerate up to 5.5 V regardless of VCC, enabling safe interfacing between 3.3 V controllers and 5 V peripherals. Output stages provide power-down protection (functional when VCC = 0 V) and meet AEC-Q100 requirements for automotive-qualified variants - though MC74VHC244MELG itself is industrial-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 5.5 V - supports mixed-voltage system integration and brown-out resilience down to 2.0 V. |
| tPD (Typ) | 3.8 ns at VCC = 5.0 V, CL = 15 pF - enables high-throughput data transfer in fast parallel buses. |
| IOL/IOH | ±25 mA per output - drives standard TTL loads and multiple CMOS inputs without external buffers. |
| VIH/VIL | 1.5 V / 0.5 V min/max at VCC = 2.0 V - ensures reliable logic recognition across full supply range. |
| Cin (Max) | 4 pF - minimizes capacitive loading on upstream drivers, preserving signal edge integrity. |
| ICC (Max) | 4.0 µA at TA = 25°C - ultra-low static power ideal for battery-backed or energy-sensitive applications. |
| VOLP (Max) | 0.9 V - low dynamic ground bounce supports noise-critical timing paths in dense PCB layouts. |
Pinout & Package
MC74VHC244MELG is housed in a 20-pin SOIC-20 wide-body package (Case 751D), measuring 12.8 mm × 7.5 mm × 2.35 mm, with 1.27 mm pitch and Pb-free (RoHS-compliant) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low output enables - independently gate YA (pins 18,16,14,12) and YB (pins 17,15,13,11) groups. |
| 2–5, 11–14 | A1–A4, B1–B4 | Buffer inputs - accept 5.5 V-tolerant logic signals; no level-shifting required for 3.3 V/5 V mixing. |
| 12–18 | YA1–YA4, YB1–YB4 | Noninverting 3-state outputs - high-impedance state activated when respective OE is high. |
| 10, 20 | GND, VCC | Power terminals - decoupling capacitor placement near pin 20 (VCC) and pin 10 (GND) is critical for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5 V input tolerance | Enables direct connection to 5 V buses while operating from 3.3 V supply - eliminates external level shifters. |
| Power-down protection | Outputs remain high-impedance and non-destructive when VCC = 0 V - prevents back-driving during hot-swap or battery backup. |
| High noise immunity | 28% noise margin (VNIH/VNIL) ensures robust operation in electrically noisy industrial environments. |
| Pb-free & RoHS compliant | Meets global environmental regulations; compatible with lead-free reflow profiles (260 °C peak). |
| Latchup immunity | Exceeds 100 mA per JEDEC JESD78 Class II - protects against destructive latchup in transient overvoltage events. |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Address Bus Driver |
|---|---|
Use Scenario: Isolating and buffering 16-bit address lines between a modern 3.3 V FPGA and legacy 5 V peripheral ASIC on a programmable logic controller backplane. IC Role / Device Role / Timing Role: Noninverting 3-state buffer with dual enables - selectively gates address segments during DMA cycles while maintaining bus contention-free operation. Use Value: 5.5 V-tolerant inputs eliminate level-shifter ICs; 3.8 ns tPD ensures setup/hold timing compliance at 25 MHz bus clock. |
Use Scenario: Driving 8-bit I/O port expansion on an 8051-based embedded controller where bus loading exceeds microcontroller drive capability. IC Role / Device Role / Timing Role: Octal buffer with independent group enables - isolates peripheral I/O from main data bus during interrupt service routines. Use Value: ±25 mA per output sustains TTL-compatible fanout; low ICC (4 µA) preserves system standby current budget. |
| Automotive Body Control Module (BCM) Subsystem | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing a 3.3 V CAN controller MCU to 5 V discrete driver ICs in a vehicle body control module. IC Role / Device Role / Timing Role: Voltage-level translator and bus isolator - translates logic levels while preventing ground-loop currents via 3-state control. Use Value: Input tolerance and power-down protection prevent damage during battery disconnect/reconnect sequences. |
Use Scenario: Generating synchronized 8-bit stimulus patterns for DUT testing in automated test equipment with strict timing jitter limits. IC Role / Device Role / Timing Role: Low-skew buffer stage - reduces inter-channel skew (tOSLH ≤ 1.5 ns) between parallel digital outputs. Use Value: Balanced propagation delays and 0.9 V VOLP minimize pattern-dependent timing uncertainty in high-speed test vectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V); 3.3 V only; 3.5 ns tPD; 24 mA drive; 5 V-tolerant inputs. | Optimized for pure 3.3 V systems; not suitable for 5 V bus interfacing without external clamping. | Select when operating exclusively at 3.3 V and requiring lower static power (1 µA ICC) and smaller TSSOP-20 footprint. |
| 74VHC244SJX | Same VCC range (2–5.5 V); identical pinout; 4.0 ns tPD; same 5.5 V input tolerance; SOIC-20 package. | Drop-in replacement with minor propagation delay variance; identical thermal and ESD performance. | Choose for second-source assurance with identical functional behavior and layout compatibility. |
Compared with SN74LVC244APWR and 74VHC244SJX, the MC74VHC244MELG uniquely supports full 2.0–5.5 V operation with guaranteed 5.5 V input tolerance - making it the only option among the three for mixed-voltage designs requiring 2 V minimum supply headroom and 5 V bus compatibility.
Availability
MC74VHC244MELG is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74VHC244MELG 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 manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC74VHC244MELG belongs to the VHC (Very High Speed CMOS) logic family, engineered for high-speed, low-power, and voltage-flexible digital interfacing in mixed-signal and legacy-system upgrade applications.
FAQ
What is the maximum operating temperature range for the MC74VHC244MELG?
The MC74VHC244MELG is rated for operation from −55 °C to +125 °C, meeting industrial and extended-temperature requirements. This range is confirmed in the Recommended Operating Conditions table (page 4 of the datasheet) and validated across all electrical parameters including propagation delay, output drive, and leakage current.
Does the MC74VHC244MELG support 3.3 V to 5 V level translation?
Yes, the MC74VHC244MELG supports bidirectional level translation: its inputs tolerate up to 5.5 V regardless of VCC, allowing a 3.3 V-powered MC74VHC244MELG to safely accept 5 V logic inputs, while its CMOS outputs swing rail-to-rail (0 V to VCC), delivering full 5 V logic highs when VCC = 5 V.
What package type is used for the MC74VHC244MELG?
The MC74VHC244MELG uses a 20-pin SOIC-20 wide-body package (Case 751D), with dimensions 12.8 mm × 7.5 mm × 2.35 mm, 1.27 mm pitch, and Pb-free/RoHS-compliant finish - as specified in the Ordering Information and Mechanical Case Outline sections (pages 10–11).
Can the MC74VHC244MELG be used with VCC = 2.0 V?
Yes, the MC74VHC244MELG is fully specified down to VCC = 2.0 V per the Recommended Operating Conditions (page 4). At 2.0 V, VIH is guaranteed ≥1.5 V and VIL ≤0.5 V, ensuring reliable logic threshold margins, though propagation delay increases to 11.0 ns (max) at CL = 50 pF.
Is the MC74VHC244MELG pin-compatible with the MC74VHCT244A series?
No - while both share identical pinout and function, the MC74VHC244MELG has CMOS-compatible inputs (VIH = 70% VCC), whereas the MC74VHCT244A has TTL-compatible inputs (VIH = 2.0 V fixed). They are functionally interchangeable only if input logic thresholds match the driving source; otherwise, level compatibility must be verified per application.
MC74VHC244MELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74VHC244MELG FAQ
1.How can I place an order for MC74VHC244MELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHC244MELG 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 MC74VHC244MELG reliable?
The price and inventory of MC74VHC244MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHC244MELG is usually 5 days.
3.What payment methods are accepted for MC74VHC244MELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHC244MELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHC244MELG?
MC74VHC244MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHC244MELG 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 MC74VHC244MELG?
For technical support, including MC74VHC244MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHC244MELG requirements.
6.How does Aetrix verify that MC74VHC244MELG is sourced from the original manufacturer or authorized distributors?
All MC74VHC244MELG 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 MC74VHC244MELG meets industry standards.
7.What is the process for return or replacement of MC74VHC244MELG?
All MC74VHC244MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHC244MELG, 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 MC74VHC244MELG part is unused and in its original packaging.
Return procedure for MC74VHC244MELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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