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onsemi 74LVQ125SJ
- Part No.:
- 74LVQ125SJ
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVQ125SJ.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,710
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Product details
Overview
74LVQ125SJ from Fairchild Semiconductor is a low-voltage quad non-inverting buffer with 3-STATE outputs, designed for 3.3V logic interface and bus-driving applications. It operates from 2.0V to 3.6V, delivers ±12mA output drive, supports −40°C to +85°C industrial temperature range, and features guaranteed 1.5ns max output-to-output skew at 3.3V.
For engineers reviewing the 74LVQ125SJ datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZH ≤ 11.0ns), simultaneous switching noise immunity, incident-wave switching into 75Ω transmission lines, and EIAJ TYPE II SOP-14 package compatibility.
Technical Context
The 74LVQ125SJ implements four independent CMOS buffer channels, each with separate 3-STATE enable control per output (active-low OE per channel). Its architecture ensures deterministic propagation delay matching across outputs-critical for parallel bus integrity in high-speed digital systems.
It meets stringent dynamic threshold and simultaneous switching noise specifications under load, with guaranteed incident-wave switching performance into 75Ω lines and defined VIHD/VILD dynamic input thresholds (1.7V/1.5V at VCC = 3.3V) for reliable signal sampling in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 3.6V - Enables direct interfacing with 3.3V LVTTL and LVCMOS systems without level translation. |
| Output Drive | ±12mA - Sufficient to drive standard 50pF loads with <10ns propagation delay (tPLH/tPHL ≤ 10.0ns @ 3.3V). |
| 3-STATE Enable Time | tPZH ≤ 11.0ns - Ensures fast bus release for time-critical multiplexed data paths. |
| Output Skew | tOSLH/tOSHL ≤ 1.5ns - Guarantees synchronized edge alignment across all four outputs for parallel bus timing. |
| Dynamic Input Thresholds | VIHD = 1.7V, VILD = 1.5V @ VCC = 3.3V - Provides noise margin against ground bounce and crosstalk in dense PCB layouts. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
| Input Capacitance | CIN = 4.5pF - Minimizes loading on upstream drivers and preserves signal rise/fall times. |
Pinout & Package
74LVQ125SJ is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Number M14D), with gull-wing leads and standard 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Inputs (A1–A4) | Independent data inputs for each of the four buffer channels. |
| 2, 5, 11, 14 | Outputs (Y1–Y4) | Non-inverting buffered outputs, each individually 3-STATE controllable via corresponding OE. |
| 3, 6, 12, 9 | Output Enables (OE1–OE4) | Active-low enables; pulling low activates output, pulling high places output in high-impedance state. |
| 7 | GND | Ground reference for all logic and power domains. |
| 14 | VCC | Positive supply rail (2.0V–3.6V); decoupling required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Voltage Operation | 2.0V–3.6V supply range enables native integration into 3.3V systems without voltage translation circuitry. |
| Guaranteed Simultaneous Switching Noise Immunity | Validated under worst-case package conditions to prevent false triggering during multi-output transitions. |
| Incident-Wave Switching into 75Ω | Ensures clean signal launch onto controlled-impedance traces without reflection-induced glitches. |
| Precision Output Timing Matching | ≤1.5ns max output-to-output skew guarantees deterministic timing for parallel data buses and address latching. |
| High-Impedance Isolation | IOZ ≤ ±2.5µA at 3.6V ensures minimal leakage when outputs are disabled-critical for shared-bus contention avoidance. |
Applications
| Industrial PLC I/O Expansion | 3.3V Bus Interface Isolation |
|---|---|
Use Scenario: Expanding digital I/O capacity in programmable logic controllers using multiplexed backplane buses. IC Role / Device Role / Timing Role: Quad buffer isolates microcontroller GPIO from noisy field-side signals while enabling bidirectional bus control via 3-STATE outputs. Use Value: Guaranteed 1.5ns skew and −40°C to +85°C operation ensure deterministic timing and reliability in factory-floor environments. | Use Scenario: Interfacing mixed-voltage subsystems (e.g., 3.3V FPGA to legacy 5V peripherals) using level-shifting buffers. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE outputs acts as direction-controlled bus driver between voltage domains. Use Value: ±12mA drive strength and incident-wave switching into 75Ω support clean signal integrity on long PCB traces without external termination. |
| Test Equipment Signal Routing | Embedded Controller Address Latching |
Use Scenario: Dynamic reconfiguration of signal paths in automated test equipment (ATE) using FPGA-controlled bus switches. IC Role / Device Role / Timing Role: Four independent 3-STATE buffers serve as digitally controlled analog/digital signal gates. Use Value: tPZH ≤ 11.0ns and tPHZ ≤ 10.5ns enable sub-12ns bus arbitration cycles for high-throughput pattern generation. | Use Scenario: Latching address/data lines in microcontroller-based instrumentation with external memory or peripherals. IC Role / Device Role / Timing Role: Buffer isolates MCU pins from capacitive loading of external devices and enables time-multiplexed bus sharing. Use Value: Low input capacitance (4.5pF) and 2.0V–3.6V operation reduce MCU I/O loading and simplify power domain design. |
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 |
|---|---|---|---|
| SN74LVC125APW | Same 14-pin TSSOP package; slightly higher VOH (2.95V min @ 3.3V) but no guaranteed incident-wave switching spec. | Preferred where tighter VOH margin is needed; not recommended for 75Ω transmission line driving without external tuning. | Select SN74LVC125APW only if board layout allows added series termination or if incident-wave compliance is not required. |
| 74ALVC125MTCX | Higher speed (tPLH ≤ 3.3ns), but narrower VCC range (2.3V–3.6V); lacks guaranteed simultaneous switching noise specs. | Better for ultra-fast timing-critical paths; unsuitable for noisy industrial environments requiring noise immunity validation. | Choose 74ALVC125MTCX only when propagation delay dominates over noise robustness and thermal range requirements. |
Compared with SN74LVC125APW and 74ALVC125MTCX, the 74LVQ125SJ uniquely combines guaranteed 75Ω incident-wave switching, −40°C to +85°C qualification, and validated simultaneous switching noise immunity-making it optimal for industrial bus interfaces where signal integrity and environmental resilience are co-prioritized.
Availability
74LVQ125SJ is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, 3.3V bus interface isolation, and embedded controller address latching requiring stable component supply and long-term lifecycle assurance.
Supply support for 74LVQ125SJ 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.
The 74LVQ125SJ belongs to Fairchild's LVQ low-voltage logic family, engineered specifically for noise-immune, high-speed 3.3V system interfacing with guaranteed AC timing and dynamic threshold behavior.
FAQ
What is the maximum operating supply voltage for the 74LVQ125SJ?
The 74LVQ125SJ has an absolute maximum supply voltage rating of +7.0V, but its recommended operating range is strictly 2.0V to 3.6V. Operating outside this range may cause undefined logic behavior or accelerated device degradation. The 74LVQ125SJ is characterized and guaranteed only within the 2.0V–3.6V window for all DC and AC parameters including VIH, VOL, and propagation delay.
Does the 74LVQ125SJ support true bidirectional data flow?
No, the 74LVQ125SJ is a unidirectional non-inverting buffer with independent 3-STATE control per output. It does not contain internal direction control or bus transceiver logic. Each channel accepts one input (An) and drives one output (On); bidirectional operation requires external control of OE signals and complementary circuitry. The 74LVQ125SJ functions exclusively as a one-way signal conditioner and bus driver.
What is the significance of "guaranteed incident wave switching into 75Ω" for the 74LVQ125SJ?
This specification confirms that the 74LVQ125SJ can cleanly launch signals onto 75Ω transmission lines-common in video, RF, and high-speed test equipment-without requiring external series termination resistors. It ensures the output driver's edge rate and impedance profile match 75Ω lines to minimize reflections. The 74LVQ125SJ achieves this across its full operating temperature and voltage range, unlike generic buffers that only meet this under nominal conditions.
Can unused inputs on the 74LVQ125SJ be left floating?
No, unused inputs on the 74LVQ125SJ must be tied HIGH or LOW-floating inputs are prohibited. The datasheet explicitly states in Note 2: "Unused inputs must be held HIGH or LOW. They may not float." Floating inputs risk increased ICC, erratic output behavior due to noise coupling, and potential latch-up in worst-case conditions. This requirement applies to all four A-inputs and all four OE inputs on the 74LVQ125SJ.
Is the 74LVQ125SJ pin-compatible with the standard 74LS125 or 74HC125?
No, the 74LVQ125SJ is not pin-compatible with 74LS125 or 74HC125. While all three share the same 14-pin SOP/SOIC footprint and basic function (quad 3-STATE buffer), the 74LVQ125SJ uses active-low OE per channel (pins 3,6,12,9), whereas 74LS125 and 74HC125 use dual-channel OE controls (e.g., OE1 on pin 1, OE2 on pin 15 in DIP variants). The 74LVQ125SJ's OE assignment and logic polarity differ fundamentally-requiring PCB layout revision for substitution.
74LVQ125SJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVQ
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- 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:
- 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
74LVQ125SJ FAQ
1.How can I place an order for 74LVQ125SJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVQ125SJ 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 74LVQ125SJ reliable?
The price and inventory of 74LVQ125SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVQ125SJ is usually 5 days.
3.What payment methods are accepted for 74LVQ125SJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVQ125SJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVQ125SJ?
74LVQ125SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVQ125SJ 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 74LVQ125SJ?
For technical support, including 74LVQ125SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVQ125SJ requirements.
6.How does Aetrix verify that 74LVQ125SJ is sourced from the original manufacturer or authorized distributors?
All 74LVQ125SJ 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 74LVQ125SJ meets industry standards.
7.What is the process for return or replacement of 74LVQ125SJ?
All 74LVQ125SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LVQ125SJ, 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 74LVQ125SJ part is unused and in its original packaging.
Return procedure for 74LVQ125SJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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