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onsemi 74VHC125N
- Part No.:
- 74VHC125N
- Manufacturer:
- onsemi
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
74VHC125N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
74VHC125N 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.
For engineers reviewing the 74VHC125N datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPHZ ≤ 10.0ns), low ICC (4 µA max), high noise immunity (28% VCC), and SOIC-14 package compatibility with legacy 74HC125 designs.
Technical Context
The 74VHC125N implements four independent CMOS buffer channels, each with separate enable control (Bn inputs) and high-impedance output capability. Its silicon-gate VHC process enables TTL-compatible speed while maintaining CMOS power efficiency and input overvoltage protection (–0.5V to +7.0V).
All inputs include diode-clamped protection and power-down safety; unused inputs must be tied HIGH or LOW per spec. The device supports dual-supply system interfacing - e.g., 5V logic driving 3V buses - without external level shifters due to its rail-tolerant input structure and 0V–VCC output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0V–5.5V - supports single-supply operation across 3.3V and 5V logic domains |
| Propagation Delay | 3.8ns (typ.) at VCC = 5V, CL = 15pF - enables high-speed bus buffering in synchronous systems |
| Output Drive | ±8mA at VCC = 4.5V - sufficient to drive standard TTL loads or multiple CMOS inputs |
| Quiescent Current | 4 µA (max) at TA = 25°C - ensures ultra-low static power in battery-backed or standby circuits |
| Noise Immunity | 28% VCC (min) - provides robust operation in electrically noisy industrial environments |
| Input Voltage Range | –0.5V to +7.0V - allows safe interfacing between mismatched supply rails without damage |
| 3-STATE Disable Time | 6.1ns (typ.) at VCC = 5V - critical for glitch-free bus arbitration and hot-swap readiness |
Pinout & Package
74VHC125N is supplied in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body. Dimensions: 8.75mm × 3.90mm × 1.75mm (L×W×H), pitch 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Inputs (A1–A4) | Active-HIGH data inputs; tolerate up to 7V regardless of VCC |
| 2, 5, 11, 14 | Enable Inputs (B1–B4) | Active-HIGH 3-STATE controls; each independently gates one buffer output |
| 3, 6, 12, 9 | Outputs (O1–O4) | Non-inverting buffered outputs; enter high-impedance state when Bi = LOW |
| 7 | GND | Ground reference for all I/O and internal circuitry |
| 14 | VCC | Positive supply rail; powers internal logic and defines output voltage swing |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | 3.8ns tPD at 5V - matches bipolar TTL performance without sacrificing power efficiency |
| Rail-tolerant input protection | –0.5V to +7.0V input range - eliminates need for external clamping diodes in mixed-rail systems |
| Low dynamic noise | VOLP ≤ 0.8V at CL = 50pF - reduces switching-induced crosstalk in dense PCB layouts |
| Pin- and function-compatible with 74HC125 | Drop-in replacement for existing HC designs - no layout or firmware changes required |
| JEDEC-compliant SOIC packaging | MS-012 footprint - ensures compatibility with standard reflow profiles and automated assembly |
Applications
| Industrial Bus Interface | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating and driving address/data lines between a 5V microcontroller and 3.3V peripheral ICs on a shared bus. IC Role / Device Role / Timing Role: Quad non-inverting buffer with independent 3-STATE control per channel - enables time-multiplexed bus sharing without contention. Use Value: Eliminates level-shifter ICs by tolerating 5V inputs while operating from 3.3V supply, reducing BOM count and board area. |
Use Scenario: Expanding GPIO count on an MCU by connecting parallel peripherals (e.g., ADCs, DACs, sensors) via a shared data bus. IC Role / Device Role / Timing Role: Output-enable-controlled buffer - allows MCU to selectively activate one peripheral at a time while tri-stating others. Use Value: Enables deterministic bus arbitration with <10ns disable timing, preventing read/write collisions during rapid peripheral switching. |
| Battery-Backed System Interface | Legacy TTL-to-CMOS Translation |
Use Scenario: Interfacing main system logic (5V) with a backup real-time clock or SRAM powered by a 3V coin cell. IC Role / Device Role / Timing Role: Voltage-agnostic buffer - maintains signal integrity during brown-out or supply switchover events. Use Value: Input protection prevents latch-up or damage when main supply drops while backup remains active, ensuring fail-safe operation. |
Use Scenario: Replacing obsolete 74LS125 in aging equipment requiring lower power and higher noise margin. IC Role / Device Role / Timing Role: Direct-pin-compatible TTL-equivalent buffer - preserves original PCB layout while upgrading reliability and thermal performance. Use Value: Reduces quiescent current from ~15mA (LS) to 4µA (VHC), cutting standby power by >99% without redesign. |
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 |
|---|---|---|---|
| 74HC125N | Higher ICC (up to 80µA), slower tPD (8ns typ. at 5V), same pinout and logic function | Less suitable for ultra-low-power or high-speed timing-critical paths | Prefer 74VHC125N where sub-5ns delay or <5µA standby current is required |
| SN74LVC125N | 3.3V-only supply (1.65–3.6V), lower VOL (0.55V @ 24mA), smaller TSSOP option available | Not compatible with 5V systems; requires level shifting for mixed-voltage use | Choose SN74LVC125N only in pure 3.3V designs needing higher drive strength and lower voltage operation |
Compared with 74HC125N and SN74LVC125N, the 74VHC125N uniquely balances 5V operation, 3.8ns speed, and 4µA quiescent current - making it optimal for mixed-supply industrial controllers where both voltage flexibility and low power are mandatory.
Availability
74VHC125N is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller peripheral expansion, and battery-backed system interface requiring stable component supply, long-term lifecycle support, and JEDEC-standard SOIC packaging.
Supply support for 74VHC125N 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 leading analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy VHC logic family remains widely supported and qualified for industrial use.
The 74VHC125N belongs to Fairchild's Very High-Speed CMOS (VHC) logic series, engineered for applications demanding TTL-speed performance with CMOS power efficiency - especially in mixed-voltage, noise-sensitive, and space-constrained embedded systems.
FAQ
What is the maximum supply voltage rating for the 74VHC125N?
The 74VHC125N supports an absolute maximum supply voltage (VCC) of +7.0V, though recommended operation is limited to 2.0V–5.5V. This extended rating enables robustness against transient overvoltage conditions and simplifies design margining in unregulated power environments.
Does the 74VHC125N support true 5V-to-3V level translation?
Yes - the 74VHC125N accepts input voltages up to +7.0V independent of VCC, allowing direct connection of 5V signals into a 3.3V-powered device. Its output swing remains 0V to VCC, so it outputs clean 3.3V logic levels when VCC = 3.3V.
Is the 74VHC125N pin-compatible with the 74HC125N?
Yes, the 74VHC125N is fully pin- and function-compatible with the 74HC125N. Both share identical SOIC-14 pinouts, truth tables, and logic behavior - enabling drop-in replacement to improve speed (3.8ns vs. 8ns) and reduce quiescent current (4µA vs. 80µA).
What is the purpose of the Bn inputs on the 74VHC125N?
The Bn inputs (pins 2, 5, 11, 14) serve as individual 3-STATE enable controls for each of the four buffers. When Bi = HIGH, the corresponding output On follows the An input; when Bi = LOW, On enters high-impedance state - essential for bus contention avoidance and multi-driver systems.
Can unused inputs on the 74VHC125N be left floating?
No - per the datasheet, all unused inputs on the 74VHC125N must be tied HIGH or LOW. Floating inputs can cause excessive ICC, unpredictable output states, or increased susceptibility to noise due to CMOS input stage metastability.
74VHC125N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-MDIP
74VHC125N FAQ
1.How can I place an order for 74VHC125N through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC125N 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 74VHC125N reliable?
The price and inventory of 74VHC125N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC125N is usually 5 days.
3.What payment methods are accepted for 74VHC125N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC125N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC125N?
74VHC125N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC125N 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 74VHC125N?
For technical support, including 74VHC125N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC125N requirements.
6.How does Aetrix verify that 74VHC125N is sourced from the original manufacturer or authorized distributors?
All 74VHC125N 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 74VHC125N meets industry standards.
7.What is the process for return or replacement of 74VHC125N?
All 74VHC125N units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC125N, 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 74VHC125N part is unused and in its original packaging.
Return procedure for 74VHC125N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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