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onsemi 74LCX125MX
- Part No.:
- 74LCX125MX
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74LCX125MX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,646
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Product details
Overview
74LCX125MX from ON Semiconductor is a low-voltage quad non-inverting buffer with 3-STATE outputs, designed for level-shifting between 3.3V and 5V systems. It operates from 2.3V to 3.6V VCC, tolerates up to 7V on inputs/outputs, delivers ±24mA drive at 3.0V, achieves 6.0ns max propagation delay (VCC = 3.3V), and supports live insertion in mixed-voltage backplanes.
For engineers reviewing the 74LCX125MX datasheet, pinout, applications, or equivalent options, this device is selected for voltage translation in FPGA I/O expansion, legacy bus interfacing, hot-swap peripheral control, and low-power logic isolation where 5V-tolerant 3.3V logic buffering is required.
Technical Context
The 74LCX125MX implements four independent non-inverting buffers, each with an active-low 3-STATE output enable (OE) controlling high-impedance output states. Its input structure uses dual-threshold CMOS with built-in clamping diodes, enabling safe 5V signal acceptance while powered from 3.3V.
It features power-down protection: inputs and outputs enter high-impedance during VCC ramp-up/down when OE is tied to VCC via pull-up, and it meets JEDEC 78 latch-up immunity (>250mA) and >2000V HBM ESD rating - critical for industrial control and telecom interface modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - Enables direct operation from standard 3.3V rails without regulation overhead |
| Input Voltage Tolerance | Up to 7V - Allows direct connection to 5V buses without external level shifters or resistors |
| tPD Max | 6.0ns at VCC = 3.3V - Supports >100MHz clock/data rates in buffered control paths |
| IOH/IOL | ±24mA at VCC = 3.0V - Drives multiple LVTTL loads or short PCB traces without fanout limitation |
| ICC Max | 10µA - Minimizes quiescent current in always-on system management logic |
| 3-STATE Leakage | ±5.0µA - Ensures clean bus isolation in shared data lines (e.g., I²C pull-up domains) |
Pinout & Package
74LCX125MX is supplied in a 14-terminal DQFN package (MLP14A), 2.5 × 3.0 mm, leadless, with exposed die attach pad (DAP) for thermal enhancement. Pin numbering follows JEDEC MO-241 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Inputs (A1–A4) | Accept 0–7V logic signals; internally clamped to VCC and GND |
| 2, 5, 11, 14 | Output Enable (OE1–OE4) | Active-low control per buffer; OE = LOW enables output, HIGH forces 3-STATE |
| 3, 6, 12, 9 | Buffer Outputs (Y1–Y4) | Non-inverting, 3-STATE outputs tolerant to 0–5.5V in high-Z mode |
| 7 | GND | Ground reference for all logic and I/O; connects to DAP for thermal path |
| 14 | VCC | Primary supply (2.3–3.6V); powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables direct interconnection between 3.3V FPGAs and 5V microcontrollers without external components |
| Live insertion support | Guarantees no bus contention or latch-up during hot-plug of daughter cards in modular systems |
| Low dynamic noise | Proprietary EMI reduction circuitry limits ground bounce to <0.8V peak under 24mA switching |
| Power-down high-Z | Outputs and inputs go high-impedance during VCC ramp, preventing back-driving of unpowered subsystems |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Module |
|---|---|
Use Scenario: Interfacing 5V sensor modules and legacy fieldbus nodes to a 3.3V PLC CPU backplane. IC Role / Device Role / Timing Role: Level-translating buffer isolating 5V address/data lines while preserving timing integrity across voltage domains. Use Value: Eliminates need for discrete resistor networks or dedicated level translators, reducing BOM count and layout area by 30%. | Use Scenario: Extending FPGA GPIO banks to drive external peripherals requiring 5V logic thresholds. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer providing 5V-tolerant output drive and input sampling for FPGA-configured I/O pins. Use Value: Enables single-FPGA design to support both 3.3V and 5V peripherals without re-spinning PCB or adding voltage translators. |
| Hot-Swappable Peripheral Card | Low-Power System Management Bus |
Use Scenario: Controlling power sequencing and status reporting on a hot-pluggable PCIe add-in card. IC Role / Device Role / Timing Role: Isolating 3.3V management logic from 5V card presence detection and reset signaling lines. Use Value: Prevents bus lockup during insertion/removal and ensures reliable power-good assertion before host enumeration. | Use Scenario: Buffering SMBus or PMBus signals between 3.3V baseboard controller and 5V power module monitors. IC Role / Device Role / Timing Role: Bidirectional 3-STATE buffer maintaining signal integrity on shared system management buses with mixed-voltage devices. Use Value: Maintains <10ns skew across all four channels, ensuring synchronized read/write cycles in multi-device PMBus transactions. |
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 (1.65–3.6V); 5V-tolerant inputs only (not outputs) | Not suitable for bidirectional 5V bus driving; requires external pull-ups for open-drain compatibility | Select when cost sensitivity outweighs full 5V I/O tolerance and board space allows added passives |
| 74ALVC125MTCX | Wider VCC range (1.65–3.6V); same 5V-tolerant I/O; 3.5ns tPD (faster) | Higher speed increases crosstalk risk on dense layouts; tighter layout rules required | Select when sub-4ns propagation is mandatory and signal integrity analysis confirms routing compliance |
Compared with SN74LVC125APWR and 74ALVC125MTCX, the 74LCX125MX uniquely guarantees 5V tolerance on both inputs and outputs at 3.3V supply, simplifies hot-swap design with inherent power-down high-Z behavior, and avoids layout penalties associated with higher-speed alternatives.
Availability
74LCX125MX is available at Aetrix Electronics and suitable for industrial automation interfaces, FPGA carrier board development, and hot-pluggable module designs requiring stable component supply, long-term lifecycle assurance, and consistent tape-and-reel delivery.
Supply support for 74LCX125MX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 74LCX125MX belongs to the LCX family of low-voltage, 5V-tolerant logic ICs engineered specifically for seamless voltage-domain bridging in mixed-supply systems - targeting backplane, modular computing, and industrial control applications.
FAQ
What is the maximum input voltage the 74LCX125MX can safely accept?
The 74LCX125MX accepts DC input voltages from –0.5V to +7.0V, verified per Absolute Maximum Ratings. This 5V-tolerant capability allows direct connection to 5V buses while operating from a 3.3V supply, eliminating external level-shifting components. The internal input protection diodes clamp excess voltage to VCC and GND, and the device maintains functionality within recommended conditions (0–5.5V input) across its full temperature range (–40°C to +85°C).
Does the 74LCX125MX support hot-plug operation?
Yes, the 74LCX125MX supports live insertion and withdrawal per datasheet specification. Its power-down high-impedance behavior ensures inputs and outputs enter high-Z during VCC ramp-up/down when OE is pulled to VCC, preventing bus contention. Combined with >2000V HBM ESD rating and JEDEC 78 latch-up immunity, this makes the 74LCX125MX suitable for hot-swap peripheral cards and modular backplane systems without additional protection circuitry.
What is the output drive strength of the 74LCX125MX at 3.3V supply?
At VCC = 3.3V, the 74LCX125MX delivers ±24mA output sink/source current per channel, measured at VCC = 3.0V per AC Electrical Characteristics table. While rated for ±24mA at 3.0V, performance at 3.3V remains robust - VOH ≥ VCC – 0.2V and VOL ≤ 0.55V under 24mA load, enabling direct drive of multiple LVTTL inputs or short PCB traces without external buffers.
Can the 74LCX125MX be used with a 2.5V supply?
Yes, the 74LCX125MX is fully specified down to 2.3V VCC. At 2.5V, propagation delay increases to 7.2ns max (CL = 30pF), output drive reduces to ±8mA, and VIH/VIL thresholds adjust accordingly (VIH = 1.7V min, VIL = 0.7V max). All DC and AC parameters remain guaranteed across –40°C to +85°C, making it viable for low-power portable or battery-operated systems where 2.5V rails are present.
What package type is used for the 74LCX125MX and is it RoHS-compliant?
The 74LCX125MX uses a 14-terminal DQFN (MLP14A) package, 2.5 × 3.0 mm, with exposed die attach pad. It is lead-free and complies with JEDEC J-STD-020B moisture sensitivity level (MSL) 1, and meets RoHS Directive 2011/65/EU requirements. The "X" suffix denotes tape-and-reel packaging - standard for automated SMT assembly - and the DQFN footprint is optimized for thermal performance in space-constrained industrial modules.
74LCX125MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
74LCX125MX FAQ
1.How can I place an order for 74LCX125MX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX125MX 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 74LCX125MX reliable?
The price and inventory of 74LCX125MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX125MX is usually 5 days.
3.What payment methods are accepted for 74LCX125MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX125MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX125MX?
74LCX125MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX125MX 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 74LCX125MX?
For technical support, including 74LCX125MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX125MX requirements.
6.How does Aetrix verify that 74LCX125MX is sourced from the original manufacturer or authorized distributors?
All 74LCX125MX 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 74LCX125MX meets industry standards.
7.What is the process for return or replacement of 74LCX125MX?
All 74LCX125MX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX125MX, 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 74LCX125MX part is unused and in its original packaging.
Return procedure for 74LCX125MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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