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onsemi SZNCP3712ASNT3G
- Part No.:
- SZNCP3712ASNT3G
- Manufacturer:
- onsemi
- Category:
- Mixed Technology
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZNCP3712ASNT3G.pdf
- Description:
- TVS DEVICE MIXED SC-74
- Quantity:
- Payment:
- Shipping:
Inventory:3,719
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Product details
Overview
SZNCP3712ASNT3G from onsemi is an automotive-grade, AEC−Q101-qualified high-side load switch with over-voltage protection, designed to isolate sensitive downstream circuits from input transients up to 105 V peak. It features active turn-off response, flexible external Zener-set OV threshold, automatic recovery, and guaranteed off-state control via Enbl (active-low) input. Used in DC power distribution for line-operated equipment and pre-conditioning regulator inputs.
For engineers reviewing the SZNCP3712ASNT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its 105 V transient withstand rating, 0.2 V typical on-state voltage at 100 mA, SC−74 package compatibility, and Enbl-controlled fast shutdown timing (tPHL ≤ 1.5 µs).
Technical Context
The SZNCP3712ASNT3G integrates a high-side MOSFET switch with internal current-sensing and comparator-based over-voltage detection. Its Enbl (pin 1) is active-low and guarantees off-state isolation even under fault conditions, while Vz (pin 4) accepts an external Zener diode to set the precise over-voltage trip point.
It employs internal resistor dividers (R1 = 3.3–6.1 kΩ, R2 = 7.0–13 kΩ) to bias the protection circuitry and delivers fast transient response via active turn-off-shutting down within 1.5 µs when Vin exceeds the Zener-defined threshold. The device operates across −40°C to +85°C ambient and sustains 300 mW dissipation at 25°C with 2.4 mW/°C derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input−Output Voltage | 105 V - Withstands automotive load-dump transients without clamping or failure |
| On-State Voltage (100 mA) | 0.2 V (typ), 0.5 V (max) - Minimizes conduction loss and self-heating in low-voltage systems |
| Enable Input Logic | Active-low (Enbl) - Guarantees fail-safe off-state when control signal is deasserted or lost |
| Propagation Delay (Hi→Lo) | ≤1.5 µs - Enables rapid isolation of downstream loads during fast-rising transients |
| Operating Ambient Range | −40°C to +85°C - Validated for under-hood and industrial power rail applications |
| Package | SC−74 (Case 318F), 6-pin - Surface-mount footprint compatible with automated assembly and thermal relief pads |
| AEC−Q101 Qualified | Yes - Certified for automotive electronics per stress-test requirements including HTOL, TC, and ESD (2000 V HBM) |
Pinout & Package
SC−74 package (Case 318F), 6-pin surface-mount, Pb-free, with exposed thermal pad (not electrically connected). Pin 1 = Enbl (active-low enable), Pin 4 = Vz (Zener reference input), Pin 2 = Vin (input), Pin 5 = Vout (output), Pin 3 and Pin 6 = N.C. (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Enbl) | Active-low enable input | Drives internal gate driver; logic-low forces guaranteed off-state regardless of Vin or Vz condition |
| Pin 2 (Vin) | Main input supply terminal | Accepts up to 105 V transient input; connects to upstream power source or battery rail |
| Pin 3 (N.C.) | No internal connection | Not bonded; must remain unconnected on PCB to avoid parasitic coupling or ESD path issues |
| Pin 4 (Vz) | Zener reference input | Connects to cathode of external Zener diode; sets over-voltage trip threshold (e.g., 16 V Zener → ~15.5–18.7 V trip range) |
| Pin 5 (Vout) | Switched output terminal | Delivers protected power to load; exhibits <100 µA leakage in off-state at 30 V |
| Pin 6 (N.C.) | No internal connection | Not bonded; floating; no routing or copper fill required beneath this pad |
Key Features
| Feature | Design Value |
|---|---|
| Active turn-off transient response | Shuts off within 1.5 µs (tPHL) upon over-voltage detection - prevents energy transfer to load during fast transients |
| Flexible over-voltage threshold | Set externally via Zener diode on Pin 4 - enables precise trip-point tuning (e.g., 13.5 V, 16 V, 24 V) without redesign |
| Guaranteed off-state control | Enbl pin forces hard cutoff even if Vin exceeds 105 V or Zener fails open - eliminates latch-up risk |
| Automated recovery | Resumes normal operation automatically once Vin decays below threshold - no reset or power cycle required |
| Low saturation voltage | 0.2 V typical at 100 mA - reduces I²R losses and thermal rise in compact 300 mW-rated SC−74 package |
Applications
| Automotive Load-Dump Protection | Industrial DC Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs from ISO 7637-2 Pulse 5a/b load-dump transients on 12 V battery rails. IC Role / Device Role / Timing Role: High-side transient isolator that actively disconnects load within 1.5 µs of over-voltage detection. Use Value: Prevents damage to downstream LDOs and microcontrollers by diverting transient energy upstream instead of absorbing it. |
Use Scenario: Distributing regulated 24 V DC to multiple modules in factory automation controllers with shared power bus. IC Role / Device Role / Timing Role: Programmable over-voltage guard for individual branch outputs, configurable via Zener selection. Use Value: Enables selective shutdown of faulty branches without interrupting other subsystems - improves system-level fault containment. |
| Voltage Regulator Input Pre-Conditioning | Sensitive Circuit Buffering |
|
Use Scenario: Stabilizing unregulated 15–28 V input to a 5 V buck converter feeding FPGA I/O banks. IC Role / Device Role / Timing Role: Front-end over-voltage clamp and enable-gated switch preceding the regulator stage. Use Value: Eliminates need for large TVS diodes or series resistors - preserves efficiency and reduces BOM count. |
Use Scenario: Isolating precision analog sensor front-ends (e.g., RTD bridges) from noisy 12 V supply rails in test equipment. IC Role / Device Role / Timing Role: Low-leakage (<100 µA), low-VON high-side switch enabling clean power sequencing. Use Value: Maintains sub-mV baseline stability by blocking ripple and transient coupling during power-up/down transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side over-voltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP3712ASNT3G | Non-automotive grade; same electrical specs but lacks AEC−Q101 qualification and SZ prefix traceability | Approved for commercial/industrial use only; not suitable for automotive production | Select when AEC−Q101 compliance is not required and cost sensitivity is higher |
| TPS25940ARVCR | Integrated 2.7–18 V operating range, programmable OV threshold (0.5–6 V), no external Zener needed; higher quiescent current (120 µA vs. <10 µA) | Designed for USB PD and portable systems; lacks 105 V transient rating and automotive qualification | Prefer for low-voltage, digitally configurable designs where wide input range and small solution size outweigh transient robustness |
Compared with NCP3712ASNT3G and TPS25940ARVCR, the SZNCP3712ASNT3G uniquely combines AEC−Q101 qualification, 105 V transient tolerance, and external Zener flexibility - making it the only option qualified for automotive load-dump protection where field reliability and regulatory traceability are mandatory.
Availability
SZNCP3712ASNT3G is available at Aetrix Electronics and suitable for automotive electronic control units, industrial DC power distribution systems, and voltage regulator input pre-conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SZNCP3712ASNT3G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP3712/SZNCP3712 family was engineered specifically for high-reliability over-voltage transient isolation in harsh environments - targeting automotive and industrial power rail protection where passive clamping is insufficient.
FAQ
What is the maximum transient voltage the SZNCP3712ASNT3G can withstand?
The SZNCP3712ASNT3G is rated for 105 V peak input-to-output voltage per its Absolute Maximum Ratings table. This specification reflects its ability to survive automotive load-dump transients defined in ISO 7637-2 without breakdown or latch-up, provided the device remains within its thermal limits and Enbl is properly controlled. The SZNCP3712ASNT3G achieves this via internal avalanche-rated structure and active turn-off architecture - not passive clamping.
Does the SZNCP3712ASNT3G require an external boost resistor (Rboost) to drive 200 mA loads?
No, the SZNCP3712ASNT3G is capable of switching loads up to 200 mA without an external Rboost resistor, as confirmed in its official features list and Electrical Characteristics table. Internal gate drive circuitry provides sufficient current to maintain low VON under this load. Rboost is optional and only recommended for higher-current applications beyond 200 mA or where faster switching is required.
How is the over-voltage trip threshold set on the SZNCP3712ASNT3G?
The over-voltage trip threshold is set externally using a Zener diode connected between Pin 4 (Vz) and ground. The Zener's breakdown voltage directly determines the trip point - for example, a 16 V Zener yields a nominal trip range of 15.5 V to 18.7 V depending on temperature and load. This method allows precise, application-specific threshold tuning without modifying the SZNCP3712ASNT3G itself.
Is the SZNCP3712ASNT3G pin-compatible with the NCP3712ASNT3G?
Yes, the SZNCP3712ASNT3G and NCP3712ASNT3G share identical SC−74 package dimensions, pinout, and electrical functionality. The "SZ" prefix denotes automotive qualification (AEC−Q101), enhanced process controls, and PPAP-capable manufacturing - but does not alter pin assignment, internal circuitry, or interface behavior. Both devices use Pin 1 for Enbl, Pin 2 for Vin, Pin 4 for Vz, and Pin 5 for Vout.
What is the guaranteed off-state leakage current of the SZNCP3712ASNT3G at 30 V input?
Per the Electrical Characteristics table, the SZNCP3712ASNT3G exhibits ≤100 µA output leakage current (Iload(off)) when Vin = Venbl = 30 V and TA = 25°C. This ultra-low off-state current ensures minimal standby power loss and prevents unintended loading of upstream supplies - critical for always-on automotive modules and battery-backed industrial sensors.
SZNCP3712ASNT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Clamping:
- -
- Technology:
- Mixed Technology
- Number of Circuits:
- 1
- Applications:
- General Purpose
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZNCP3712ASNT3G FAQ
1.How can I place an order for SZNCP3712ASNT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNCP3712ASNT3G 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 SZNCP3712ASNT3G reliable?
The price and inventory of SZNCP3712ASNT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNCP3712ASNT3G is usually 5 days.
3.What payment methods are accepted for SZNCP3712ASNT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNCP3712ASNT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNCP3712ASNT3G?
SZNCP3712ASNT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNCP3712ASNT3G 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 SZNCP3712ASNT3G?
For technical support, including SZNCP3712ASNT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNCP3712ASNT3G requirements.
6.How does Aetrix verify that SZNCP3712ASNT3G is sourced from the original manufacturer or authorized distributors?
All SZNCP3712ASNT3G 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 SZNCP3712ASNT3G meets industry standards.
7.What is the process for return or replacement of SZNCP3712ASNT3G?
All SZNCP3712ASNT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZNCP3712ASNT3G, 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 SZNCP3712ASNT3G part is unused and in its original packaging.
Return procedure for SZNCP3712ASNT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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