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onsemi 74LVQ125SJX
- Part No.:
- 74LVQ125SJX
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVQ125SJX.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,214
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Product details
Overview
74LVQ125SJX from Fairchild Semiconductor is a low-voltage quad non-inverting buffer IC with 3-STATE outputs, designed for 3.3V logic interfacing in space-constrained digital systems. It operates from 2.0V to 3.6V, delivers ±12mA drive strength, guarantees ≤10.0ns propagation delay (VCC = 3.3V), and supports simultaneous switching into 75Ω transmission lines - used in bus buffering and level translation between ASICs and FPGAs.
For engineers reviewing the 74LVQ125SJX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed output skew (≤1.5ns), dynamic input voltage thresholds (VIHD = 2.0V, VILD = 0.8V at 3.3V), 3-STATE leakage <±2.5µA, and SOIC-14 (M14D) package compatibility with EIAJ TYPE II footprint.
Technical Context
This device implements four independent CMOS buffer channels, each with separate 3-STATE enable control via dedicated input pins (A1–A4). All outputs are actively driven HIGH/LOW or placed in high-impedance state - no internal pull-ups/downs. Input thresholds are dynamically specified to ensure robust noise immunity during fast edge transitions.
AC performance is characterized under controlled load (CL = 50pF) and transmission-line conditions (75Ω incident-wave switching). Propagation delays (tPLH/tPHL), enable/disable times (tPZH/tPLZ), and output-to-output skew are guaranteed across −40°C to +85°C and 2.0V–3.6V supply range - critical for synchronous bus timing integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 3.6V - compatible with 3.3V LVTTL and mixed-voltage I/O domains |
| IO Drive | ±12mA - sufficient to drive 50pF loads or terminate 75Ω transmission lines |
| tPLH / tPHL | ≤10.0ns @ VCC = 3.3V - ensures sub-100MHz bus timing margin |
| tOSHL / tOSLH | ≤1.5ns - enables synchronized multi-channel output switching without skew-induced glitches |
| VIH / VIL | 2.0V / 0.8V @ VCC = 3.3V - meets LVTTL input compatibility requirements |
| IOZ Leakage | ±2.5µA max - minimizes standby current in high-impedance bus-hold configurations |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
74LVQ125SJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Number M14D), with standard SOIC pin spacing (1.27mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | A1–A4 Inputs | Buffer enable inputs - HIGH enables corresponding output; LOW disables (3-STATE) |
| 2, 5, 11, 14 | B1–B4 Inputs | Data inputs - non-inverting path to respective outputs |
| 3, 6, 12, 9 | O1–O4 Outputs | 3-STATE buffered outputs - driven HIGH/LOW when A_n = HIGH; high-Z when A_n = LOW |
| 7 | GND | Ground reference for all logic and I/O circuits |
| 14 | VCC | Positive supply rail - must be decoupled locally per JEDEC guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed pin-to-pin skew | ≤1.5ns - eliminates timing misalignment across four buffered outputs in parallel bus applications |
| Incident-wave switching into 75Ω | Specified for commercial temp range - enables direct connection to video or RF interconnects without external termination |
| Simultaneous switching noise control | Characterized and bounded - reduces crosstalk in dense PCB layouts with multiple buffers switching concurrently |
| Dynamic VIHD/VILD thresholds | 2.0V/0.8V @ 3.3V - improves noise margin against ground bounce and supply droop during fast transitions |
Applications
| PCI Bus Buffering | FPGA I/O Expansion |
|---|---|
Use Scenario: Isolating and driving PCI Local Bus signals between legacy peripherals and host bridge logic. IC Role / Device Role / Timing Role: Quad buffer provides direction-controlled signal isolation with 3-STATE capability for shared bus arbitration. Use Value: Guaranteed ≤10ns propagation delay and ≤1.5ns skew maintain PCI timing budgets while supporting hot-plug-compatible tri-state control. | Use Scenario: Extending FPGA GPIO count by buffering I/O lines to external memory or sensor interfaces. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer for 3.3V FPGA banks interfacing with 3.3V peripheral logic. Use Value: ±12mA drive strength and 2.0V/0.8V input thresholds ensure reliable LVTTL compatibility and noise-immune operation. |
| Industrial Control Backplane | Digital Video Signal Routing |
Use Scenario: Driving parallel control signals across long backplane traces in PLC or motion controller racks. IC Role / Device Role / Timing Role: Low-noise buffer with controlled edge rates prevents reflections on unterminated 75Ω traces. Use Value: Incident-wave switching guarantee into 75Ω allows direct routing without external termination resistors - reducing BOM count and layout area. | Use Scenario: Routing parallel digital video data (e.g., BT.656) between encoder and display interface ICs. IC Role / Device Role / Timing Role: Synchronized quad buffer maintains pixel clock alignment across data lanes. Use Value: Output-to-output skew ≤1.5ns prevents data eye closure in multi-bit parallel video paths operating up to 27MHz. |
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 |
|---|---|---|---|
| 74LVC125AD,118 (Nexperia) | Lower ICC (max 10µA), same VCC range (1.65–3.6V), slightly faster tPD (7.5ns typ), different pinout (A/B swapped) | Preferred for ultra-low-quiescent designs; requires PCB layout revision due to pin reordering | Select when minimizing standby power is critical and board redesign is acceptable |
| SN74LV125ADR (Texas Instruments) | Identical pinout and AC specs; wider VCC range (2.0–5.5V); higher VOL (0.55V max @ 16mA) | Supports mixed 3.3V/5V system interfaces; less suitable for strict 75Ω transmission line driving | Choose for backward compatibility with 5V-tolerant systems where 75Ω incident-wave switching is not required |
Compared with 74LVQ125SJX, the Nexperia part offers lower static power but demands layout changes, while the TI part adds 5V tolerance at the cost of reduced transmission-line drive fidelity - making 74LVQ125SJX optimal for deterministic 75Ω signaling in pure 3.3V industrial backplanes.
Availability
74LVQ125SJX is available at Aetrix Electronics and suitable for PCI bus buffering, FPGA I/O expansion, and industrial control backplane applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 74LVQ125SJX 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 analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.
The 74LVQ125SJX belongs to Fairchild's LVQ low-voltage logic family, engineered specifically for noise-sensitive 3.3V digital systems requiring precise timing, controlled edge rates, and guaranteed transmission-line interface performance.
FAQ
What is the maximum recommended supply voltage for the 74LVQ125SJX?
The absolute maximum supply voltage for the 74LVQ125SJX is +7.0V, but the recommended operating range is strictly 2.0V to 3.6V. Operation above 3.6V risks violating DC electrical specifications, including VIH/VIL thresholds and output drive capability. The 74LVQ125SJX is not 5V-tolerant, and sustained VCC > 3.6V may accelerate parametric drift or cause premature failure. Always use local decoupling and verify rail stability under load.
Does the 74LVQ125SJX support hot-swap or live-insertion applications?
The 74LVQ125SJX supports hot-swap operation only when used with proper power sequencing and bus-hold or series termination. Its 3-STATE outputs and low IOZ leakage (±2.5µA) minimize disturbance during insertion, but the device lacks built-in hot-swap protection circuitry. For reliable live-insertion, external current-limiting resistors and controlled ramp-up of VCC are required. The 74LVQ125SJX itself does not include undervoltage lockout or slew-rate control for hot-swap compliance.
What is the meaning of "incident wave switching into 75Ω" for the 74LVQ125SJX?
"Incident wave switching into 75Ω" means the 74LVQ125SJX is characterized to cleanly launch logic transitions onto unterminated 75Ω transmission lines without overshoot or ringing - verified down to 75Ω impedance and across −40°C to +85°C. This capability allows direct connection to video or RF interconnects without external termination resistors. The 74LVQ125SJX achieves this via controlled output edge rates and dynamic drive strength matching.
Can unused inputs on the 74LVQ125SJX be left floating?
No, unused inputs on the 74LVQ125SJX must never be left floating. Per Fairchild's Recommended Operating Conditions (Note 2), all unused inputs must be tied HIGH or LOW - typically via pull-up or pull-down resistors - to prevent metastability, excessive ICC, or unintended output switching. Floating inputs can cause oscillation, increased power consumption, and electromagnetic interference. This requirement applies to both A_n (enable) and B_n (data) inputs on the 74LVQ125SJX.
Is the 74LVQ125SJX pin-compatible with the standard 74LS125?
No, the 74LVQ125SJX is not pin-compatible with the 74LS125. Although both are quad 3-STATE buffers, the 74LVQ125SJX uses a different pin assignment: enables (A1–A4) are on pins 1,4,10,13, while data inputs (B1–B4) occupy pins 2,5,11,14 - whereas the 74LS125 places enables adjacent to their respective outputs. Additionally, the 74LVQ125SJX operates at 3.3V only and lacks TTL input thresholds. Direct replacement would require PCB redesign and logic-level adaptation.
74LVQ125SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVQ
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOP
74LVQ125SJX FAQ
1.How can I place an order for 74LVQ125SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVQ125SJX 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 74LVQ125SJX reliable?
The price and inventory of 74LVQ125SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVQ125SJX is usually 5 days.
3.What payment methods are accepted for 74LVQ125SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVQ125SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVQ125SJX?
74LVQ125SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVQ125SJX 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 74LVQ125SJX?
For technical support, including 74LVQ125SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVQ125SJX requirements.
6.How does Aetrix verify that 74LVQ125SJX is sourced from the original manufacturer or authorized distributors?
All 74LVQ125SJX 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 74LVQ125SJX meets industry standards.
7.What is the process for return or replacement of 74LVQ125SJX?
All 74LVQ125SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVQ125SJX, 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 74LVQ125SJX part is unused and in its original packaging.
Return procedure for 74LVQ125SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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