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onsemi MC74VHCT125AM
- Part No.:
- MC74VHCT125AM
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74VHCT125AM.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-14
- Quantity:
- Payment:
- Shipping:
Inventory:1,533
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Product details
Overview
MC74VHCT125AM from onsemi is a high-speed CMOS quad 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 2.0–5.5 V supply range - enabling reliable 3.3 V to 5.0 V level translation in industrial bus interfaces.
For engineers reviewing the MC74VHCT125AM datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.8 ns typical propagation delay at 5.0 V, ±8 mA output drive capability, 3-state enable polarity (active-low OE), input tolerance up to 7.0 V, and robust ESD protection (>2000 V HBM).
Technical Context
The MC74VHCT125AM implements four independent non-inverting buffers, each with an active-low 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 - supporting hot-insertion and battery-backup scenarios.
All four channels share identical DC/AC specifications: TTL-compatible inputs, full 5.0 V rail-to-rail output swing, balanced tPLH/tPHL propagation delays (≤5.3 ns typ at 5.0 V/15 pF), and matched enable/disable timing (tPZL/tPLZ ≤ 5.1 ns / 6.1 ns typ at 5.0 V). Input capacitance is limited to 4 pF max, minimizing loading on upstream drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.0 V to 5.5 V - supports mixed-voltage system interfacing without external level shifters |
| Propagation Delay | 3.8 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables >100 MHz bus operation with tight timing margins |
| Output Drive | ±8.0 mA at VCC = 4.5 V - sufficient to drive 50 pF loads with <10 ns edge rates in standard PCB traces |
| Input Voltage Tolerance | 0 V to 7.0 V - allows safe connection to 5 V systems while powered from 3.3 V rails |
| 3-State Leakage | 0.25 µA max at VCC = 5.5 V - ensures minimal current draw and signal integrity during high-impedance mode |
| ESD Rating | Human Body Model > 2000 V - reduces risk of field failure during handling and assembly |
| Operating Temp | −55 °C to +125 °C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
MC74VHCT125AM is available in SOIC-14 (case 751A) and TSSOP-14 (case 948G) packages. Both are surface-mount, Pb-free, RoHS-compliant, and thermally rated for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 (Active-Low) | Independent 3-state enable inputs - pull high to disable output (Z); low to enable (A→Y) |
| 2, 5, 11, 14 | A1–A4 | Buffer input terminals - accept TTL- or CMOS-level signals across full 0–7.0 V range |
| 3, 6, 8, 12 | Y1–Y4 | Non-inverting buffered outputs - deliver full-rail CMOS swing (0 V to VCC) with ±8 mA drive |
| 7 | GND | Ground reference for all logic and power domains - must be low-inductance connection |
| 14 | VCC | Positive supply rail - decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIL = 0.8 V / VIH = 2.0 V at VCC = 5.0 V - eliminates need for external input conditioning when interfacing legacy 5 V logic |
| Wide Supply Range | 2.0–5.5 V operation - enables single part number deployment across 3.3 V and 5.0 V subsystems |
| Input Overvoltage Protection | Inputs tolerate 0–7.0 V regardless of VCC - prevents latch-up or damage during power sequencing mismatches |
| Zero-VCC Output Protection | Outputs remain protected when VCC = 0 V - supports hot-plug and backup-battery configurations |
| Low Dynamic Noise | VOLP ≤ 0.8 V (max) - limits ground bounce and crosstalk in dense multi-buffer layouts |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Isolation |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Quad non-inverting buffer with independent 3-state enables - provides direction-controlled data path isolation between MCU and peripheral slots. Use Value: 7.0 V input tolerance prevents damage during transient coupling; 3.8 ns propagation delay preserves timing margins in 20 MHz backplane clock domains. | Use Scenario: Level-shifting sensor data lines from 3.3 V MCU to 5.0 V CAN transceiver and LIN physical layer ICs. IC Role / Device Role / Timing Role: Voltage translator and bus driver - converts logic levels while driving capacitive loads up to 50 pF per channel. Use Value: Full 5.0 V output swing ensures noise margin compliance with ISO 11898-2; −55 °C to +125 °C rating meets AEC-Q100 Grade 1 requirements. |
| Medical Diagnostic Equipment Data Acquisition | Test & Measurement Instrumentation Signal Routing |
Use Scenario: Buffering analog-to-digital converter (ADC) parallel output buses to FPGA capture interfaces in portable ultrasound systems. IC Role / Device Role / Timing Role: High-speed bus buffer with low skew - synchronizes 8-bit or 16-bit parallel data paths across multiple ADC channels. Use Value: Balanced tPLH/tPHL and 1.0 ns max output-to-output skew (at 5.0 V) maintain setup/hold timing across multi-channel sampling windows. | Use Scenario: Enabling/disabling signal paths between DUT interface connectors and internal measurement ASICs in automated test equipment. IC Role / Device Role / Timing Role: Programmable 3-state switch matrix - selectively connects test resources to device pins without signal contention. Use Value: Independent OE pins allow dynamic reconfiguration of routing topology; 0.25 µA max 3-state leakage prevents DC offset accumulation in precision analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC range (1.65–3.6 V), 3.3 V only; 3.5 ns typ tPD at 3.3 V; no 7.0 V input tolerance | Restricted to 3.3 V-only systems; unsuitable for 5 V interfacing or mixed-voltage hot-swap | Select when operating exclusively at 3.3 V and lowest possible propagation delay is critical |
| 74HC125N,652 | Wider VCC range (2.0–6.0 V); higher ICC (80 µA max); no guaranteed 5 V TTL compatibility; 15 ns typ tPD at 4.5 V | Higher power, slower speed, and less robust input protection - not recommended for noise-sensitive or high-reliability designs | Select only for cost-sensitive, non-critical consumer applications where speed and ESD immunity are secondary |
Compared with SN74LVC125APWR and 74HC125N,652, the MC74VHCT125AM uniquely combines 5 V TTL compatibility, 7.0 V input tolerance, sub-4 ns speed at 5 V, and AEC-Q100 qualification - making it the preferred choice for industrial and automotive bus isolation where voltage interoperability and reliability are mandatory.
Availability
MC74VHCT125AM is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical diagnostic data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74VHCT125AM 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 VHCT logic family - including MC74VHCT125AM - was designed specifically for mixed-voltage system interfacing, combining TTL input compatibility, wide supply range, and robust overvoltage protection to simplify design in harsh, multi-rail environments.
FAQ
What is the maximum input voltage the MC74VHCT125AM can tolerate?
The MC74VHCT125AM inputs tolerate voltages from −0.5 V to +7.0 V regardless of the VCC supply voltage. This overvoltage capability protects against transient coupling, power sequencing mismatches, and hot-insertion events - a key differentiator versus standard HC or LVC buffers. The specification is verified per the Absolute Maximum Ratings table in the official onsemi datasheet (Rev. 11, page 3).
Does the MC74VHCT125AM support 3.3 V to 5.0 V level translation?
Yes, the MC74VHCT125AM supports bidirectional level translation between 3.3 V and 5.0 V domains. Its TTL-compatible inputs (VIH = 2.0 V min) reliably recognize 3.3 V logic highs, while its CMOS outputs swing rail-to-rail (0 V to VCC), delivering full 5.0 V logic levels when VCC = 5.0 V. This functionality is explicitly confirmed in the device description and DC characteristics tables of the onsemi MC74VHCT125A datasheet.
What is the 3-state enable polarity for the MC74VHCT125AM?
The MC74VHCT125AM uses active-low 3-state enable inputs (OE1–OE4). When OE is logic high, the corresponding Y output enters high-impedance (Z) state; when OE is logic low, the buffer is enabled and Y follows A. This behavior is defined in the Function Table (page 2) and Logic Diagram (page 2) of the official onsemi datasheet.
Is the MC74VHCT125AM qualified for automotive applications?
The base MC74VHCT125AM is not AEC-Q100 qualified; however, the NLVVHCT125ADTRG variant - which shares identical electrical and thermal specifications - is AEC-Q100 Grade 1 qualified and PPAP capable. The "NLV" prefix denotes automotive-grade manufacturing controls and traceability. Designers requiring automotive qualification should specify the NLV variant, not the standard MC74VHCT125AM.
What package options are available for the MC74VHCT125AM?
The MC74VHCT125AM is offered in two RoHS-compliant, Pb-free packages: SOIC-14 (suffix D, case 751A) and TSSOP-14 (suffix DT, case 948G). Both packages support surface-mount assembly, operate from −55 °C to +125 °C, and are listed in the Ordering Information table on page 2 of the onsemi datasheet. Tape-and-reel packaging is standard for both variants.
MC74VHCT125AM 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:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-14
MC74VHCT125AM FAQ
1.How can I place an order for MC74VHCT125AM through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT125AM 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 MC74VHCT125AM reliable?
The price and inventory of MC74VHCT125AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT125AM is usually 5 days.
3.What payment methods are accepted for MC74VHCT125AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT125AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHCT125AM?
MC74VHCT125AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT125AM 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 MC74VHCT125AM?
For technical support, including MC74VHCT125AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT125AM requirements.
6.How does Aetrix verify that MC74VHCT125AM is sourced from the original manufacturer or authorized distributors?
All MC74VHCT125AM 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 MC74VHCT125AM meets industry standards.
7.What is the process for return or replacement of MC74VHCT125AM?
All MC74VHCT125AM units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT125AM, 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 MC74VHCT125AM part is unused and in its original packaging.
Return procedure for MC74VHCT125AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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