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onsemi 74LCX125SJX
- Part No.:
- 74LCX125SJX
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LCX125SJX.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,982
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Product details
Overview
74LCX125SJX from ON Semiconductor is a low-voltage quad non-inverting buffer with 3-STATE outputs, designed for level-shifting between 5V and 3.3V/2.5V systems. It operates from 2.3V to 3.6V VCC, tolerates up to 7V on inputs/outputs, delivers ±24mA drive at VCC = 3.0V, features 6.0ns max propagation delay (VCC = 3.3V), and supports live insertion in mixed-voltage backplanes.
For engineers reviewing the 74LCX125SJX datasheet, pinout, applications, or equivalent options, this device is selected for voltage translation in FPGA I/O expansion, industrial controller bus interfacing, and low-power embedded system logic isolation where 5V-tolerant 3.3V CMOS compatibility is required.
Technical Context
The 74LCX125SJX implements four independent non-inverting buffers, each with an active-low 3-STATE output enable (OE) controlling bidirectional signal flow. Its input structure uses overvoltage-tolerant clamping diodes and scaled gate oxides to sustain 7V DC while operating from 2.3–3.6V supply, enabling safe interfacing between legacy 5V TTL and modern low-voltage logic without external resistors or translators.
Each buffer provides rail-to-rail output swing, high-impedance power-down behavior when OE is inactive, and robust ESD protection (>2000V HBM). Propagation delay skew between outputs is limited to 1.0ns, ensuring tight timing alignment across all four channels in synchronous data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - Enables operation in 2.5V and 3.3V systems while maintaining full 5V input/output tolerance |
| tPD Max | 6.0ns at VCC = 3.3V, CL = 50pF - Supports >100MHz data rates in point-to-point or lightly loaded bus applications |
| IOH/IOL | ±24mA at VCC = 3.0V - Drives multiple LVTTL or LCX loads without fanout limitation |
| VI Tolerance | –0.5V to +7.0V - Allows direct connection to 5V buses without level-shifter ICs or series resistors |
| ICC Max | 10µA - Ensures ultra-low static power in battery-backed or always-on control subsystems |
| tPZH/tPHZ | 1.5–7.0ns - Guarantees fast, predictable 3-STATE enable/disable for dynamic bus arbitration |
| CIN | 7.0pF - Minimizes capacitive loading on driving sources, preserving signal integrity in high-speed traces |
Pinout & Package
74LCX125SJX is housed in a 14-lead SOP (EIAJ TYPE II, 5.3mm wide), pin-compatible with industry-standard 14-pin logic packages. The package supports standard reflow profiles and is lead-free per JEDEC J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Buffer Inputs (A1–A4) | Accept 5V-tolerant logic signals; internally clamped to prevent latch-up during mixed-voltage transitions |
| 2, 5, 11, 14 | Buffer Outputs (Y1–Y4) | 3-STATE outputs with rail-to-rail swing; high-impedance when corresponding OE is HIGH |
| 3, 6, 12, 9 | Output Enable Inputs (OE1–OE4) | Active-low enables; must be pulled HIGH via resistor during power-up to ensure defined high-Z state |
| 7 | GND | Ground reference for all logic and I/O; decoupling capacitor placement critical for noise suppression |
| 14 | VCC | Primary supply (2.3–3.6V); separate VCC and GND pins minimize switching noise coupling into analog sections |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables direct interface between 5V microcontrollers and 3.3V FPGAs without external level shifters or voltage dividers |
| Live insertion support | Prevents bus contention and supply rail disturbance during hot-plug operations in modular industrial backplanes |
| Power-down high-impedance | Guarantees zero current draw and no signal leakage when OE is deasserted, critical for power-gated subsystems |
| ±24mA output drive | Drives 10+ LVTTL loads or long PCB traces without signal degradation or timing margin loss |
| Low ICC (10µA max) | Reduces total system quiescent current in always-on monitoring circuits, extending battery life in portable equipment |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion |
|---|---|
Use Scenario: Interfacing legacy 5V sensor modules to a 3.3V FPGA-based controller in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-translating buffer isolating 5V field-side signals from low-voltage FPGA I/O banks while preserving timing integrity. Use Value: Eliminates need for discrete resistor networks or dedicated level translators, reducing BOM count and layout area by 30%. | Use Scenario: Expanding FPGA GPIO count to drive multiple 5V peripherals (e.g., displays, encoders) from a 3.3V core. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer providing bidirectional, slew-rate-controlled signal routing with precise enable timing. Use Value: Enables simultaneous control of up to four 5V peripherals with sub-7ns propagation delay and <1ns inter-output skew. |
| Automotive Body Control Module | Medical Diagnostic Equipment Data Bus |
Use Scenario: Isolating 5V CAN transceiver logic levels from 2.5V microcontroller I/O in body control units. IC Role / Device Role / Timing Role: Level-shifting buffer with ESD-hardened inputs protecting MCU pins from automotive EMI and load-dump transients. Use Value: Survives >2000V HBM ESD events and maintains functionality across –40°C to +85°C ambient range without derating. | Use Scenario: Buffering high-reliability serial data lines (e.g., RS-485 PHY interface) between 5V diagnostic sensors and 3.3V ARM-based processing modules. IC Role / Device Role / Timing Role: Low-skew, low-capacitance repeater ensuring deterministic setup/hold margins in safety-critical communication paths. Use Value: Delivers 1.0ns max output-to-output skew and 7.0pF input capacitance to maintain signal fidelity at 25Mbps baud rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC min (1.65V), no 7V input tolerance; max tPD = 4.2ns at 3.3V | Better speed in pure 3.3V systems; unsuitable for 5V-tolerant interfaces | Select when only 3.3V operation is needed and tighter timing margins are required |
| 74ALVC125MTCX | Wider VCC range (1.65–3.6V), same 5V tolerance, but lower drive (±24mA at VCC ≥ 2.3V) | Compatible pinout and function; slightly higher ICC (20µA vs. 10µA) | Choose for drop-in replacement where existing board layout must be preserved and 5V tolerance remains essential |
Compared with SN74LVC125APWR and 74ALVC125MTCX, the 74LCX125SJX uniquely balances 7V input tolerance, ultra-low ICC, and live-insertion capability-making it optimal for mixed-voltage industrial backplanes where reliability under voltage mismatch is non-negotiable.
Availability
74LCX125SJX is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and consistent 5V-tolerant logic performance.
Supply support for 74LCX125SJX 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 management, analog, logic, and sensor solutions for automotive, industrial, cloud computing, and medical markets.
The 74LCX125SJX belongs to the LCX family of advanced CMOS logic devices engineered for high-speed, low-power voltage translation in mixed-supply systems-specifically targeting interoperability between legacy 5V infrastructure and next-generation low-voltage digital ICs.
FAQ
What is the maximum input voltage rating for 74LCX125SJX?
The 74LCX125SJX supports DC input voltages from –0.5V to +7.0V, enabling direct connection to 5V logic families without external protection circuitry. This 7V tolerance is maintained across the full operating temperature range (–40°C to +85°C) and is validated per JEDEC standards, making the 74LCX125SJX suitable for bridging 5V and 3.3V domains in industrial control systems where voltage mismatches are common.
Does 74LCX125SJX support live insertion in backplane applications?
Yes, the 74LCX125SJX supports live insertion and withdrawal due to its power-down high-impedance inputs and outputs, combined with controlled I/O clamping. When VCC is off or ramping, the 74LCX125SJX presents high-impedance to both sides of the interface, preventing bus contention or back-driving. This behavior is explicitly verified in the datasheet and makes the 74LCX125SJX appropriate for hot-swappable modules in telecom and industrial backplanes.
What is the recommended pull-up resistor value for OE pins on 74LCX125SJX?
The minimum pull-up resistor value for OE pins on the 74LCX125SJX is determined by the current-sourcing capability of the driver controlling OE. As specified in the datasheet, OE should be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up or power-down. Typical values range from 4.7kΩ to 10kΩ for 3.3V systems; exact selection depends on rise-time requirements and driver strength, but must guarantee VIH ≥ 2.0V at VCC = 3.3V.
Can 74LCX125SJX operate at 2.5V VCC while maintaining full 5V input tolerance?
Yes, the 74LCX125SJX fully supports 2.5V VCC operation with guaranteed 5V input tolerance (up to 7V). At VCC = 2.5V ± 0.2V, AC parameters including tPHL/tPLH (max 7.2ns) and output drive (±8mA) are specified, and DC input thresholds (VIH = 1.7V, VIL = 0.7V) ensure reliable logic recognition. This dual-voltage capability allows the 74LCX125SJX to serve as a universal translator across 2.5V, 3.3V, and 5V logic families.
Is 74LCX125SJX pin-compatible with other 14-lead logic buffers like 74HC125?
The 74LCX125SJX shares identical pinout and functional assignment with standard 14-lead quad buffer packages (e.g., 74HC125, 74LVC125), including pin 1 (A1), pin 2 (Y1), pin 3 (OE1), etc. However, it is not electrically interchangeable due to differences in supply voltage range, input tolerance, and output drive. While PCB layout can reuse the same footprint, system-level validation is required to confirm timing, noise immunity, and voltage translation behavior before substitution with the 74LCX125SJX.
74LCX125SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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-SOP
74LCX125SJX FAQ
1.How can I place an order for 74LCX125SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX125SJX 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 74LCX125SJX reliable?
The price and inventory of 74LCX125SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX125SJX is usually 5 days.
3.What payment methods are accepted for 74LCX125SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX125SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX125SJX?
74LCX125SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX125SJX 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 74LCX125SJX?
For technical support, including 74LCX125SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX125SJX requirements.
6.How does Aetrix verify that 74LCX125SJX is sourced from the original manufacturer or authorized distributors?
All 74LCX125SJX 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 74LCX125SJX meets industry standards.
7.What is the process for return or replacement of 74LCX125SJX?
All 74LCX125SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX125SJX, 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 74LCX125SJX part is unused and in its original packaging.
Return procedure for 74LCX125SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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