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onsemi MC74VHCT126AMELG
- Part No.:
- MC74VHCT126AMELG
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74VHCT126AMELG.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-14
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
MC74VHCT126AMELG from onsemi is a high-speed CMOS quad noninverting bus buffer with 3-state control inputs, fabricated using silicon gate CMOS technology. It delivers TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), 5.0 V CMOS-level output swings, and operates across 4.5–5.5 V supply range. Its key role is level translation and bus isolation in mixed-voltage digital systems, such as interfacing 3.3 V logic to 5.0 V backplanes.
For engineers reviewing the MC74VHCT126AMELG datasheet, pinout, applications, or equivalent options, critical selection factors include guaranteed 3.8 ns propagation delay at 5.0 V, ±25 mA output drive capability, 7.0 V tolerant inputs, 3-state leakage < ±2.5 µA, and SOIC-14 package compatibility with industrial temperature range (−40°C to +85°C).
Technical Context
The MC74VHCT126AMELG implements four independent noninverting buffers, each with an active-high 3-state enable (OE) controlling output impedance. Its three-stage internal architecture includes input protection diodes rated for 0–7.0 V input voltage regardless of VCC, and outputs that remain protected even when VCC = 0 V-enabling hot-insertion and battery-backup resilience.
It supports bidirectional voltage translation: TTL-level inputs interface cleanly with 3.3 V systems, while full 5.0 V swing outputs drive legacy 5 V loads. Propagation delays are balanced (tPLH ≈ tPHL), and output-to-output skew is limited to 1.0 ns (typ) at 5.0 V/50 pF, ensuring deterministic timing in synchronous bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 3.8 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables ≤260 MHz bus operation with margin |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V rail with ±10% tolerance |
| Input Voltage Tolerance | 0 V to 7.0 V - allows safe interfacing between 3.3 V, 5.0 V, and overvoltage-tolerant systems |
| Output Drive | ±8.0 mA at VOL ≤ 0.52 V / VOH ≥ 3.66 V - sufficient to drive 50 pF loads with clean edges |
| 3-State Leakage | ±2.5 µA max at TA ≤ 85°C - ensures minimal bus contention during high-impedance state |
| Quiescent ICC | 4.0 µA max at TA = 25°C - ultra-low static power for always-on buffer applications |
| ESD Rating | HBM > 2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
MC74VHCT126AMELG is housed in a Pb-free SOIC-14 (Case 751A) package with 1.27 mm pitch, 8.65 mm × 3.90 mm body, and 1.75 mm height. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Input (A1–A4) | Noninverting data inputs; tolerate 0–7.0 V regardless of VCC |
| 2, 5, 11, 14 | 3-State Enable (OE1–OE4) | Active-high enables; must be HIGH to drive output; LOW forces high-Z |
| 3, 6, 12, 9 | Buffer Output (Y1–Y4) | CMOS-level outputs with ±25 mA drive; protected against VCC = 0 V conditions |
| 7 | GND | Ground reference for all logic and I/O; required for ESD protection path |
| 14 | VCC | Positive supply (4.5–5.5 V); powers internal logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIL = 0.8 V / VIH = 2.0 V thresholds ensure reliable recognition of legacy TTL signals at 5 V |
| Level Translation Capability | Accepts 3.3 V inputs while delivering full 5.0 V CMOS output swings - eliminates external level shifters |
| Hot-Insertion Robustness | Inputs and outputs remain protected when VCC = 0 V - prevents latch-up or damage during live board insertion |
| Low-Noise Output Design | VOLP ≤ 0.8 V (max) reduces ground bounce and crosstalk in dense PCB layouts |
| Pb-Free & RoHS Compliance | Meets EU RoHS Directive 2011/65/EU and JEDEC JS709C - suitable for green manufacturing |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 5 V CAN/LIN transceiver buses in programmable logic controllers. IC Role / Device Role / Timing Role: Quad buffer provides galvanically isolated signal routing with 3-state control for dynamic bus arbitration. Use Value: 3.8 ns propagation delay ensures sub-microsecond response to real-time I/O commands; ±25 mA drive sustains signal integrity over 15 cm traces. | Use Scenario: Translating 3.3 V MCU outputs to 5 V sensor excitation lines and actuator drivers in body electronics. IC Role / Device Role / Timing Role: Level-shifting buffer enabling interoperability between low-voltage domain controllers and legacy 5 V peripherals. Use Value: 7.0 V input tolerance prevents damage during load-dump transients; AEC-Q100 qualified variants available for automotive use. |
| Test Equipment Digital I/O Card | Medical Diagnostic Data Acquisition |
Use Scenario: Driving multiple 5 V TTL-compatible test fixtures from a single 3.3 V FPGA I/O bank in automated test systems. IC Role / Device Role / Timing Role: Bus driver with per-channel 3-state control allows dynamic reconfiguration of signal routing paths. Use Value: Balanced tPLH/tPHL delays (<0.5 ns skew) guarantee deterministic setup/hold timing across all four channels. | Use Scenario: Buffering ADC interface signals between low-power 3.3 V analog front-end and 5 V digital processing subsystems. IC Role / Device Role / Timing Role: Signal isolator preventing ground loop coupling and noise injection into sensitive analog sections. Use Value: 0.1 V max VOL at 4 mA ensures >1.0 V noise margin for 5 V logic; low ICC (4 µA) minimizes standby power in battery-operated devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad noninverting buffer with 3-state applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126APWR | Lower VCC range (1.65–3.6 V); 3.3 V only; no 5 V tolerance | Restricted to 3.3 V-only systems; cannot replace MC74VHCT126AMELG in 5 V bus environments | Select only when full 5 V operation and level translation are unnecessary |
| 74AHCT126PW,118 | Same 4.5–5.5 V range and pinout; slightly higher ICC (8 µA typ) and tPD (4.2 ns) | Direct functional substitute with identical SOIC-14 footprint and timing behavior | Preferred where NXP sourcing or AHCT family consistency is required |
Compared with SN74LVC126APWR and 74AHCT126PW,118, the MC74VHCT126AMELG uniquely combines 5 V operation, 7.0 V input tolerance, and <4 µA quiescent current - making it optimal for mixed-voltage industrial interfaces requiring robustness and low static power.
Availability
MC74VHCT126AMELG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, test equipment, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC74VHCT126AMELG 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 VHCT logic family-including MC74VHCT126AMELG-is engineered for high-speed, low-power 5 V digital interfacing with enhanced robustness, targeting applications where TTL compatibility, voltage translation, and system-level reliability are critical.
FAQ
What is the maximum input voltage rating for MC74VHCT126AMELG?
The MC74VHCT126AMELG supports DC input voltages from −0.5 V to +7.0 V, independent of VCC. This allows safe interfacing with 3.3 V, 5.0 V, and overvoltage-tolerant systems-even during hot insertion or supply sequencing mismatches. The specification is verified per the Absolute Maximum Ratings table in the official onsemi datasheet (Rev. 11, October 2016).
Does MC74VHCT126AMELG support 3.3 V logic inputs while driving 5 V loads?
Yes. MC74VHCT126AMELG accepts TTL-compatible inputs (VIH = 2.0 V min) and delivers full 5.0 V CMOS output swings, enabling direct 3.3 V-to-5.0 V level translation without external components. Its input structure tolerates up to 7.0 V, and output stages maintain VOH ≥ 3.66 V at 8 mA load under 5.0 V supply.
What is the recommended operating voltage range for MC74VHCT126AMELG?
The recommended operating VCC range for MC74VHCT126AMELG is 4.5 V to 5.5 V, as specified in the Recommended Operating Conditions table. Operation outside this range may compromise timing, noise immunity, or output drive strength. The device is not characterized for reliable operation below 4.5 V or above 5.5 V.
Is MC74VHCT126AMELG pin-compatible with standard 74-series logic buffers?
Yes. MC74VHCT126AMELG is pin- and function-compatible with industry-standard 74HCT126 and 74LS126 devices in SOIC-14 packages. Pin assignments match the standard 14-pin dual-in-line layout: inputs (A1–A4) on pins 1,4,10,13; enables (OE1–OE4) on pins 2,5,11,14; outputs (Y1–Y4) on pins 3,6,12,9; VCC on pin 14; GND on pin 7.
What thermal derating applies to MC74VHCT126AMELG in SOIC-14 package?
In SOIC-14 package, MC74VHCT126AMELG has a thermal derating factor of −7 mW/°C above 65°C ambient, as defined in the Maximum Ratings section. At 125°C, its maximum allowable power dissipation drops to 500 mW − (125 − 65) × 7 mW = 80 mW. This ensures safe operation under sustained industrial temperature conditions.
MC74VHCT126AMELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-14
MC74VHCT126AMELG FAQ
1.How can I place an order for MC74VHCT126AMELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT126AMELG 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 MC74VHCT126AMELG reliable?
The price and inventory of MC74VHCT126AMELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT126AMELG is usually 5 days.
3.What payment methods are accepted for MC74VHCT126AMELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT126AMELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHCT126AMELG?
MC74VHCT126AMELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT126AMELG 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 MC74VHCT126AMELG?
For technical support, including MC74VHCT126AMELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT126AMELG requirements.
6.How does Aetrix verify that MC74VHCT126AMELG is sourced from the original manufacturer or authorized distributors?
All MC74VHCT126AMELG 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 MC74VHCT126AMELG meets industry standards.
7.What is the process for return or replacement of MC74VHCT126AMELG?
All MC74VHCT126AMELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT126AMELG, 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 MC74VHCT126AMELG part is unused and in its original packaging.
Return procedure for MC74VHCT126AMELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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