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onsemi 74VHC125MX
- Part No.:
- 74VHC125MX
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74VHC125MX.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,604
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Product details
Overview
74VHC125MX from Fairchild Semiconductor is a quad non-inverting buffer IC with 3-STATE outputs, designed for bus interface and signal isolation in mixed-voltage digital systems. It operates from 2.0V to 5.5V, delivers 3.8ns typical propagation delay at 5V, supports ±8mA output drive, and features input tolerance up to 7V-enabling safe 5V-to-3V level translation in portable and industrial control logic.
For engineers reviewing the 74VHC125MX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPLZ), input overvoltage robustness, quiescent ICC ≤ 4 µA, and SOIC-14 package compatibility with legacy 74HC125 designs.
Technical Context
The 74VHC125MX implements four independent CMOS buffer channels, each with separate output-enable (Bn) control enabling per-channel 3-STATE management. Its silicon-gate VHC process achieves TTL-compatible speed while maintaining CMOS power efficiency and noise immunity (VNIH/VNIL ≥ 28% VCC).
All inputs tolerate –0.5V to +7.0V regardless of VCC, allowing use in battery-backup systems and dual-supply interfaces. Power-down protection prevents latch-up during supply sequencing, and quiet-output dynamic noise specs (VOLP ≤ 0.8V, VOLV ≥ –0.8V) ensure signal integrity in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0V to 5.5V - Supports both 3.3V and 5V system rails without level shifters. |
| Propagation Delay (tPD) | 3.8ns (typ.) at VCC = 5V, CL = 15pF - Enables >100 MHz bus operation in synchronous designs. |
| Output Drive | ±8mA at VCC = 4.5V - Sufficient to drive 50pF loads across 10cm traces without added buffers. |
| Input Overvoltage Tolerance | –0.5V to +7.0V - Allows direct connection to 5V signals even when VCC = 3.3V, eliminating external clamps. |
| Quiescent ICC | 4.0 µA (max.) at TA = 25°C - Reduces standby power in battery-operated controllers and IoT edge nodes. |
| 3-STATE Enable/Disable Time | tPZL = 3.6ns, tPLZ = 6.1ns (5V, CL = 50pF) - Minimizes bus contention windows in multiplexed data paths. |
Pinout & Package
74VHC125MX is supplied in a 14-lead SOIC package (JEDEC MS-012, 0.150" narrow body), with 1.27mm lead pitch and standard land pattern SOP65P640X110-14M.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Inputs (A1–A4) | Active-HIGH data inputs; accept 0–7V regardless of VCC for mixed-supply interfacing. |
| 2, 5, 9, 12 | Output Enables (B1–B4) | Active-LOW enables; pulling HIGH forces corresponding output into high-impedance state. |
| 3, 6, 8, 11 | Buffer Outputs (O1–O4) | Non-inverting 3-STATE outputs; sink/source ±8mA with VOL ≤ 0.44V at IOL = 8mA. |
| 7 | GND | Ground reference for all I/O and internal logic; must be low-impedance return path. |
| 14 | VCC | Positive supply rail (2.0–5.5V); powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | 3.8ns tPD at 5V matches TTL performance while cutting power by >90% vs. LS-TTL. |
| Input overvoltage protection | 0–7V input range decouples signal voltage from VCC, enabling plug-and-play 3V/5V interoperation. |
| Low-noise 3-STATE switching | VOLP ≤ 0.8V and VOLV ≥ –0.8V suppress ground bounce and crosstalk in dense routing. |
| Pin/function compatibility with 74HC125 | Direct drop-in replacement for existing HC designs without layout or firmware changes. |
| Power-down input protection | Prevents damage during hot insertion or unpowered backplane connection scenarios. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy 12V sensor/actuator buses in programmable logic controllers. IC Role / Device Role / Timing Role: Quad buffer provides galvanically isolated, direction-controlled signal conditioning between MCU and field-side peripherals. Use Value: Input overvoltage tolerance eliminates external TVS diodes; 3-STATE enables shared bus arbitration without contention. |
Use Scenario: Level-shifting CAN transceiver control lines and switch-mode power supply enable signals in 12V vehicle networks. IC Role / Device Role / Timing Role: Non-inverting buffer translates 3.3V MCU outputs to 5V-compatible logic thresholds while suppressing EMI-induced glitches. Use Value: 28% VCC noise margin and <10ns propagation skew ensure reliable timing in safety-critical lighting and door-lock subsystems. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
|
Use Scenario: Interfacing low-power ARM Cortex-M ADC/DAC control lines with higher-voltage analog front-end switches and multiplexers. IC Role / Device Role / Timing Role: 3-STATE output buffering isolates sensitive analog sections during digital reconfiguration sequences. Use Value: 4µA max ICC extends battery life; 7V-tolerant inputs prevent damage during probe contact or ESD events. |
Use Scenario: Driving multiple parallel DUT (device-under-test) control lines from a single FPGA I/O bank in automated test fixtures. IC Role / Device Role / Timing Role: Quad buffer distributes synchronized enable/control signals with matched propagation delay across channels. Use Value: Output skew ≤1.0ns ensures simultaneous activation of relays or muxes, improving test repeatability and calibration accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-STATE buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC range (1.65–5.5V); higher drive (±24mA); no 7V input tolerance. | Better for 1.8V logic domains; unsuitable for 5V-tolerant mixed-rail interfaces. | Select when operating below 2.0V or requiring higher current drive; verify input voltage limits match system rails. |
| 74HC125D,653 | Slower tPD (≈15ns at 5V); identical pinout and 3-STATE behavior; no 7V input rating. | Acceptable for lower-speed legacy upgrades where power budget allows higher ICC. | Choose only if cost sensitivity outweighs speed/power advantages; confirm thermal derating at full load. |
Compared with SN74LVC125APWR and 74HC125D,653, the 74VHC125MX uniquely combines 7V input tolerance, sub-4ns speed, and <4µA quiescent current-making it optimal for energy-constrained, mixed-voltage embedded systems requiring robust signal integrity.
Availability
74VHC125MX is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and JEDEC-compliant SOIC packaging.
Supply support for 74VHC125MX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and logic ICs before its acquisition by ON Semiconductor in 2016; its VHC logic family remains widely deployed in industrial and automotive applications.
The 74VHC125MX belongs to Fairchild's Very High-Speed CMOS (VHC) logic series, engineered for applications demanding TTL-equivalent speed with CMOS power efficiency and enhanced input ruggedness in mixed-supply environments.
FAQ
What is the maximum input voltage rating for 74VHC125MX, and does it depend on VCC?
The 74VHC125MX supports DC input voltages from –0.5V to +7.0V on all input pins, independent of VCC level. This specification is explicitly guaranteed in the Absolute Maximum Ratings table and confirmed by the General Description stating "0V to 7V can be applied to the input pins without regard to the supply voltage." This enables safe interfacing between 5V logic and a 3.3V-powered 74VHC125MX without external clamping components.
Is 74VHC125MX pin-compatible with standard 74HC125 devices?
Yes, the 74VHC125MX is pin- and function-compatible with the 74HC125, as stated in the Features section: "Pin and function compatible with 74HC125." Both share identical SOIC-14 pinouts, logic symbols, and truth tables. However, the 74VHC125MX offers faster propagation delay (3.8ns vs. ~15ns), lower ICC, and 7V input tolerance-making it a performance-enhanced drop-in upgrade.
What is the recommended operating temperature range for 74VHC125MX?
The 74VHC125MX is rated for continuous operation from –40°C to +85°C, as defined in the Recommended Operating Conditions table. This industrial-grade temperature range is validated across all electrical parameters including VIH/VIL thresholds, VOH/VOL levels, and propagation delays-ensuring reliability in harsh environments such as factory automation and under-hood automotive electronics.
Does 74VHC125MX require external pull-up or pull-down resistors on unused inputs?
Yes, unused inputs on the 74VHC125MX must be held HIGH or LOW-floating inputs are prohibited. The datasheet explicitly states in Note 1: "Unused inputs must be held HIGH or LOW. They may not float." Leaving inputs unconnected risks increased ICC, erratic output behavior, and potential device damage due to undefined internal node states.
What is the 3-STATE output off-state leakage current for 74VHC125MX at 5.5V?
The 74VHC125MX specifies an off-state output leakage current (IOZ) of ±0.25 µA (typical) and ±2.5 µA (maximum) at VCC = 5.5V, VIN = VIH or VIL, and VOUT = VCC or GND. This ultra-low leakage ensures minimal loading on shared buses during high-impedance states, preserving signal integrity and reducing power loss in multi-drop configurations.
74VHC125MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
74VHC125MX FAQ
1.How can I place an order for 74VHC125MX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC125MX 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 74VHC125MX reliable?
The price and inventory of 74VHC125MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC125MX is usually 5 days.
3.What payment methods are accepted for 74VHC125MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC125MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC125MX?
74VHC125MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC125MX 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 74VHC125MX?
For technical support, including 74VHC125MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC125MX requirements.
6.How does Aetrix verify that 74VHC125MX is sourced from the original manufacturer or authorized distributors?
All 74VHC125MX 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 74VHC125MX meets industry standards.
7.What is the process for return or replacement of 74VHC125MX?
All 74VHC125MX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC125MX, 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 74VHC125MX part is unused and in its original packaging.
Return procedure for 74VHC125MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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