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onsemi MC74VHCT126AM
- Part No.:
- MC74VHCT126AM
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74VHCT126AM.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-14
- Quantity:
- Payment:
- Shipping:
Inventory:3,151
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Product details
Overview
MC74VHCT126AM 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. Used in bidirectional data bus isolation and level translation between 3.3 V and 5.0 V systems.
For engineers reviewing the MC74VHCT126AM datasheet, pinout, applications, or equivalent options, key selection criteria include propagation delay (3.8 ns typ at VCC = 5.0 V), 3-state enable timing (tPZL/tPZH ≤ 5.1 ns), input tolerance up to 7.0 V, and robust ESD protection (HBM > 2000 V).
Technical Context
The MC74VHCT126AM implements four independent noninverting buffers, each with an active-high 3-state enable (OE) controlling output impedance. Its three-stage internal architecture ensures high noise immunity and balanced propagation delays between rising and falling edges.
Input structures tolerate voltages from –0.5 V to +7.0 V regardless of VCC, enabling safe interfacing of 5.0 V systems to 3.0 V logic. Output stages remain protected even when VCC = 0 V-critical for hot-insertion and battery-backup scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 5.5 V - Ensures stable operation in standard 5 V digital systems with ±10% rail tolerance. |
| Propagation Delay (A→Y) | 3.8 ns (typ) at VCC = 5.0 V, CL = 15 pF - Enables high-speed data transfer in bus-hold and memory interface applications. |
| Input Voltage Tolerance | –0.5 V to +7.0 V - Allows direct connection to overvoltage sources or mixed-voltage domains without external clamping. |
| Output Drive Strength | ±8.0 mA at VOL ≤ 0.52 V / VOH ≥ 3.66 V - Sufficient to drive 50 pF loads with defined logic levels under worst-case conditions. |
| 3-State Enable/Disable Time | tPZL ≤ 5.1 ns, tPLZ ≤ 6.1 ns (VCC = 5.0 V) - Supports fast bus arbitration and dynamic signal routing in multiplexed architectures. |
| ESD Robustness | HBM > 2000 V - Reduces risk of field failure during handling and board assembly without additional protection circuitry. |
| Quiescent Supply Current | ICC ≤ 4.0 µA (max) at TA = 25°C - Minimizes standby power in always-on system management functions. |
Pinout & Package
MC74VHCT126AM is available in SOIC-14 (Case 751A) and TSSOP-14 (Case 948G) packages. Both are 14-pin surface-mount devices with identical pin assignment and thermal derating profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Input (A1–A4) | Noninverting data inputs accepting TTL-compatible logic levels; tolerant to 7.0 V regardless of VCC. |
| 2, 5, 11, 14 | 3-State Enable (OE1–OE4) | Active-high enables corresponding output; OE = HIGH forces Y = HIGH/LOW; OE = LOW places Y in high-impedance state. |
| 3, 6, 12, 9 | Buffer Output (Y1–Y4) | CMOS-level outputs with full 5.0 V swing; protected against damage when VCC = 0 V. |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry; must be connected to system ground plane. |
| 14 | VCC | Positive supply terminal; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIL = 0.8 V / VIH = 2.0 V - Enables seamless integration into legacy 5 V TTL systems without level-shifting components. |
| Wide Input Voltage Tolerance | Supports –0.5 V to +7.0 V input range - Eliminates need for external clamping diodes in mixed-voltage or fault-tolerant designs. |
| Power-Down Input Protection | Inputs remain functional and non-damaging even when VCC = 0 V - Critical for hot-swap and battery-backed subsystems. |
| Low Dynamic Noise | VOLP ≤ 0.8 V (max) - Limits ground bounce and crosstalk in dense PCB layouts with multiple simultaneously switching outputs. |
| Pb-Free & RoHS Compliance | NLV prefix variants qualified to AEC-Q100 - Suitable for automotive infotainment and body electronics requiring PPAP documentation. |
Applications
| Industrial PLC Backplane Interface | Automotive Infotainment Data Bus Isolation |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy industrial I/O modules on a shared 5 V backplane. IC Role / Device Role / Timing Role: Quad buffer provides direction-controlled, low-latency signal conditioning with 3-state capability for bus arbitration. Use Value: 3.8 ns propagation delay and ±8 mA drive ensure reliable communication across 15 cm traces loaded with 50 pF capacitance. | Use Scenario: Level-shifting between 3.3 V SoC peripherals and 5.0 V display/audio codecs in head-unit designs. IC Role / Device Role / Timing Role: Noninverting buffer translates logic levels while maintaining signal integrity and timing margins. Use Value: 7.0 V input tolerance prevents latch-up during power sequencing mismatches between subsystems. |
| Medical Diagnostic Equipment Control Logic | Test & Measurement Instrumentation Signal Routing |
Use Scenario: Enabling/disabling sensor readout paths in multi-channel patient monitoring systems. IC Role / Device Role / Timing Role: 3-state outputs allow dynamic reconfiguration of analog front-end signal chains without hardware switches. Use Value: tPLZ ≤ 6.1 ns ensures sub-10 ns channel switching latency critical for synchronized sampling. | Use Scenario: Multiplexing calibration signals between FPGA-based controller and precision DAC/ADC modules. IC Role / Device Role / Timing Role: Quad buffer acts as programmable signal gate with deterministic enable timing. Use Value: Balanced tPLH/tPHL delays minimize skew-induced measurement error in time-critical test sequences. |
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 |
|---|---|---|---|
| SN74LVC126A | Lower VCC range (1.65–3.6 V); 3.3 V only; no 5 V tolerance on inputs. | Restricted to 3.3 V-only systems; unsuitable for 5 V legacy interface or mixed-voltage translation. | Select when operating exclusively at 3.3 V and lowest static power is prioritized over voltage flexibility. |
| 74ACT126 | Higher ICC (max 8 mA); faster tPD (2.5 ns typ); requires 4.5–5.5 V; no 7 V input tolerance. | Better speed/power trade-off in pure 5 V environments but lacks overvoltage resilience for hot-plug use cases. | Choose for maximum speed in noise-controlled 5 V systems where input overvoltage events are absent. |
Compared with SN74LVC126A and 74ACT126, the MC74VHCT126AM uniquely combines 5 V operation, TTL-compatible inputs, 7 V input tolerance, and 3-state control-making it the only option supporting robust 3.3 V ↔ 5.0 V level translation with fault resilience.
Availability
MC74VHCT126AM is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment interfaces, medical diagnostic equipment, test instrumentation, and embedded control systems requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MC74VHCT126AM 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 MC74VHCT126AM-is engineered for interoperability between 3.3 V and 5.0 V systems, emphasizing robustness, wide voltage tolerance, and compatibility with legacy TTL signaling standards.
FAQ
What is the maximum input voltage the MC74VHCT126AM can safely withstand?
The MC74VHCT126AM supports DC input voltages from –0.5 V to +7.0 V regardless of VCC level. This allows direct interfacing with 5.0 V systems even when powered from 3.3 V supplies, and protects against transient overvoltage events such as hot insertion or supply sequencing faults. The specification is verified per the Absolute Maximum Ratings table in the official onsemi datasheet (Rev. 11, October 2016).
Does the MC74VHCT126AM support true 3.3 V operation?
No-the MC74VHCT126AM is specified for 4.5 V to 5.5 V operation only. While its inputs accept 3.3 V logic levels (VIH = 2.0 V min), it cannot be powered from 3.3 V rails. For 3.3 V supply operation, consider the SN74LVC126A instead. The MC74VHCT126AM's design purpose is 5 V system compatibility with 3.3 V signal interfacing-not dual-supply operation.
How does the 3-state enable logic work on the MC74VHCT126AM?
Each of the four buffers in the MC74VHCT126AM has a dedicated active-high 3-state enable input (OE1–OE4). When OE = HIGH, the corresponding output Y reflects the input A (noninverting). When OE = LOW, the output enters high-impedance state-electrically disconnected from the bus. This behavior is confirmed in the Function Table and Logic Diagram (Figure 1) of the onsemi datasheet.
Can the MC74VHCT126AM be used in automotive applications?
Yes-NLV-prefix variants (e.g., NLVVHCT126ADTR2G) are AEC-Q100 qualified and PPAP capable for automotive use. The base MC74VHCT126AM meets industrial temperature range (–40°C to +85°C) and includes features like latchup immunity (>300 mA) and HBM ESD >2000 V, making it suitable for under-hood and cabin electronics where qualification is not mandated.
What package options are available for the MC74VHCT126AM?
The MC74VHCT126AM is offered in two RoHS-compliant, Pb-free packages: SOIC-14 (Case 751A, suffix D) and TSSOP-14 (Case 948G, suffix DT). Both share identical pinout and electrical specifications. Tape-and-reel shipping formats (2500 units per reel) are standard for both variants, as documented in the Ordering Information section of the onsemi datasheet.
MC74VHCT126AM 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
MC74VHCT126AM FAQ
1.How can I place an order for MC74VHCT126AM through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT126AM 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 MC74VHCT126AM reliable?
The price and inventory of MC74VHCT126AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT126AM is usually 5 days.
3.What payment methods are accepted for MC74VHCT126AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT126AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHCT126AM?
MC74VHCT126AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT126AM 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 MC74VHCT126AM?
For technical support, including MC74VHCT126AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT126AM requirements.
6.How does Aetrix verify that MC74VHCT126AM is sourced from the original manufacturer or authorized distributors?
All MC74VHCT126AM 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 MC74VHCT126AM meets industry standards.
7.What is the process for return or replacement of MC74VHCT126AM?
All MC74VHCT126AM units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT126AM, 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 MC74VHCT126AM part is unused and in its original packaging.
Return procedure for MC74VHCT126AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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