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onsemi MC74VHCT126AMG
- Part No.:
- MC74VHCT126AMG
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74VHCT126AMG.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-14
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
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Product details
Overview
MC74VHCT126AMG from onsemi is a high-speed CMOS quad noninverting bus buffer with 3-state control inputs, designed for level translation between 3.3 V and 5.0 V systems. It features TTL-compatible inputs (VIL = 0.8 V, VIH = 2.0 V), 3.8 ns typical propagation delay at VCC = 5.0 V, ±25 mA output drive, and operates across 4.5–5.5 V supply range. It serves as an interface buffer in mixed-voltage digital buses.
For engineers reviewing the MC74VHCT126AMG datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state timing (tPZL/tPHZ ≤ 7.5 ns), input overvoltage tolerance up to 7.0 V, 5.0 V CMOS output swing, and SOIC-14 package compatibility with legacy logic families.
Technical Context
The MC74VHCT126AMG implements four independent noninverting buffers, each with active-high 3-state enable (OE). Its silicon gate CMOS process delivers TTL-speed performance while maintaining low static power (ICC ≤ 4.0 µA at TA = 25°C). Input structures tolerate 0–7.0 V regardless of VCC, enabling safe interfacing of 5.0 V outputs to 3.0 V inputs.
Each buffer stage includes internal noise immunity enhancement via balanced propagation paths and a dedicated output buffer stage. The device supports hot insertion and battery-backup scenarios due to VCC = 0 V tolerant outputs and input protection against supply–input voltage mismatch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 3.8 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables ≥100 MHz bus operation with tight timing margins |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures robust operation under industrial rail tolerances |
| Output Drive | ±8.0 mA at VOL ≤ 0.52 V / VOH ≥ 3.66 V - sufficient for driving 50 pF loads and multiple TTL inputs |
| Input Voltage Tolerance | 0 V to 7.0 V - allows direct connection to 5 V systems without external clamping when VCC = 3.3 V |
| 3-State Leakage | ±2.5 µA max at TA ≤ 85°C - minimizes bus contention current during high-impedance state |
| ESD Rating | HBM > 2000 V - meets IEC 61000-4-2 Level 2 for board-level ESD robustness |
| Quiescent ICC | 4.0 µA max at TA = 25°C - supports ultra-low-power standby in always-on subsystems |
Pinout & Package
MC74VHCT126AMG is housed in a Pb-free SOIC-14 (Case 751A) package with standard 1.27 mm pitch, 8.65 mm × 3.91 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) | Active-high data inputs; accept TTL- or CMOS-level signals; tolerate up to 7.0 V |
| 2, 5, 11, 14 | 3-State Enable (OE1–OE4) | Active-high enables; OE = HIGH asserts output; OE = LOW forces high-impedance state |
| 3, 6, 8, 12 | Buffer Output (Y1–Y4) | Noninverting buffered outputs; full 5.0 V swing; VCC = 0 V tolerant |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry |
| 14 | VCC | Positive supply terminal; must be decoupled locally with 0.1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIL = 0.8 V / VIH = 2.0 V thresholds allow direct connection to legacy 5 V TTL logic without level shifters |
| Wide Input Voltage Tolerance | Inputs withstand 0–7.0 V independent of VCC - enables safe 5 V-to-3.3 V level translation even during power sequencing |
| Hot-Insertion Robustness | VCC = 0 V tolerant outputs prevent backfeeding and latch-up during live board insertion into powered backplanes |
| Low Dynamic Noise | VOLP ≤ 0.8 V ensures <100 mV ground bounce on shared PCB traces under fast switching |
| Pb-Free & RoHS Compliance | Meets J-STD-609 Category 1 moisture sensitivity and EU RoHS Directive 2011/65/EU requirements |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Interfacing 3.3 V microcontroller GPIOs to 5 V sensor bus lines in programmable logic controllers. IC Role / Device Role / Timing Role: Quad noninverting buffer providing direction-controlled signal isolation and voltage translation with 3-state capability for bus arbitration. Use Value: Eliminates need for discrete level-shifting components; 3.8 ns tPD ensures deterministic timing in cyclic scan-based I/O updates. | Use Scenario: Driving multiple 5 V LIN transceiver enable lines from a 3.3 V automotive MCU in body electronics modules. IC Role / Device Role / Timing Role: Level-translating buffer with independent per-channel 3-state control for selective activation of LIN subnetworks. Use Value: Input overvoltage tolerance prevents damage during load-dump transients; AEC-Q100 qualified variants available for functional safety compliance. |
| Test Equipment Digital I/O Card | Medical Diagnostic Data Acquisition System |
Use Scenario: Isolating FPGA I/O banks from external DUT test fixtures operating at 5 V logic levels. IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling FPGA-controlled tri-state management of shared test signal lines. Use Value: Low 3-state disable time (tPHZ ≤ 7.5 ns) guarantees clean bus release before next test vector application. | Use Scenario: Buffering ADC serial interface signals (SCLK, SDATA) between a low-power 3.3 V medical SoC and 5 V analog front-end ICs. IC Role / Device Role / Timing Role: Noninverting signal repeater with noise-suppressed outputs ensuring reliable SPI communication in EMI-sensitive environments. Use Value: VOLP ≤ 0.8 V and balanced propagation delays minimize bit errors in high-resolution (16+ bit) data streams. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bus buffer 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 tolerant inputs | Not suitable for 5 V system interfacing; requires external level shifters for mixed-voltage use | Select when operating exclusively in 3.3 V domains with strict low-voltage compliance needs |
| 74ACT126SCX | Higher ICC (max 8 mA); faster tPD (2.5 ns typ); 5 V only supply; no 7 V input tolerance | Lacks overvoltage-safe operation during power sequencing; unsuitable for hot-swap or battery-backed systems | Choose for maximum speed in fixed 5 V systems where robustness to supply mismatch is not required |
Compared with SN74LVC126APWR and 74ACT126SCX, the MC74VHCT126AMG uniquely combines 5 V system compatibility, 7 V input tolerance, and 3.8 ns speed-making it the only option that safely bridges 3.3 V logic to legacy 5 V infrastructure without additional components.
Availability
MC74VHCT126AMG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, test equipment, and medical data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for MC74VHCT126AMG 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 sensing solutions for automotive, industrial, and cloud infrastructure markets.
The VHCT logic family-including MC74VHCT126AMG-is engineered for mixed-voltage system interoperability, emphasizing robust level translation, hot-plug resilience, and compatibility with legacy TTL infrastructure in cost-sensitive industrial designs.
FAQ
What is the maximum input voltage rating for MC74VHCT126AMG?
The MC74VHCT126AMG supports DC input voltages from –0.5 V to +7.0 V, independent of VCC. This allows safe interfacing with 5.0 V signals even when powered from 3.3 V, eliminating external clamping diodes in many mixed-voltage designs. The specification is validated per Absolute Maximum Ratings table in the official onsemi datasheet (Rev. 11, October 2016).
Does MC74VHCT126AMG support hot insertion?
Yes, MC74VHCT126AMG supports hot insertion due to its VCC = 0 V tolerant outputs and input protection structures. When VCC is unpowered, outputs remain high-impedance and cannot backfeed the supply rail, preventing damage during live board insertion into powered backplanes. This behavior is confirmed in the "Power Down Protection" feature description and Maximum Ratings section.
What is the recommended decoupling for MC74VHCT126AMG?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC (pin 14) and GND (pin 7) terminals is recommended for MC74VHCT126AMG. This minimizes high-frequency supply noise and ensures stable operation during fast 3-state transitions. The requirement stems from the device's 3.8 ns propagation delay and 8 mA output drive capability, which demand low-inductance local energy storage.
Is MC74VHCT126AMG pin-compatible with standard 74-series logic devices?
Yes, MC74VHCT126AMG is pin- and function-compatible with industry-standard 74HCT126 and 74LS126 devices in SOIC-14 packages. Pin assignments for A1–A4, OE1–OE4, Y1–Y4, VCC, and GND match JEDEC MS-012, enabling drop-in replacement in existing designs without PCB modification.
What is the 3-state disable time (tPHZ) for MC74VHCT126AMG at 5.0 V?
The maximum 3-state disable time (tPHZ) for MC74VHCT126AMG is 7.5 ns at VCC = 5.0 V ±0.5 V, CL = 50 pF, and RL = 1.0 kΩ, as specified in the AC Electrical Characteristics table. This value ensures rapid bus release for time-critical multiplexed data paths in high-speed digital systems.
MC74VHCT126AMG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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
MC74VHCT126AMG FAQ
1.How can I place an order for MC74VHCT126AMG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT126AMG 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 MC74VHCT126AMG reliable?
The price and inventory of MC74VHCT126AMG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT126AMG is usually 5 days.
3.What payment methods are accepted for MC74VHCT126AMG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT126AMG transactions.
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4.How is shipping managed for MC74VHCT126AMG?
MC74VHCT126AMG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT126AMG 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 MC74VHCT126AMG?
For technical support, including MC74VHCT126AMG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT126AMG requirements.
6.How does Aetrix verify that MC74VHCT126AMG is sourced from the original manufacturer or authorized distributors?
All MC74VHCT126AMG 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 MC74VHCT126AMG meets industry standards.
7.What is the process for return or replacement of MC74VHCT126AMG?
All MC74VHCT126AMG units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT126AMG, 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 MC74VHCT126AMG part is unused and in its original packaging.
Return procedure for MC74VHCT126AMG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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