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onsemi SZNCP3712ASNT1G
- Part No.:
- SZNCP3712ASNT1G
- Manufacturer:
- onsemi
- Category:
- Mixed Technology
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZNCP3712ASNT1G.pdf
- Description:
- TVS DEVICE MIXED SC-74
- Quantity:
- Payment:
- Shipping:
Inventory:7,286
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Product details
Overview
SZNCP3712ASNT1G from onsemi is an automotive-grade over-voltage protected high-side switch designed to isolate sensitive loads from transient energy rather than absorb it. It supports continuous load current up to 300 mA, withstands input transients up to 105 V peak, features active turn-off for fast transient response, and guarantees off-state control via the ENBL (inverted enable) input. It is used in DC power distribution for line-operated equipment with poorly regulated supplies.
For engineers reviewing the SZNCP3712ASNT1G datasheet, pinout, applications, or equivalent options, key selection criteria include over-voltage threshold flexibility via external Zener, guaranteed off-state behavior under high-Venbl, low saturation voltage (0.2 V typ), and AEC-Q101 qualification for automotive environments.
Technical Context
The SZNCP3712ASNT1G integrates internal resistive divider networks (R1–R4) and dual NPN transistor control (Q1/Q2) to monitor Vin relative to a user-defined Zener reference at Pin 4. When input voltage exceeds the Zener-set threshold, Q2 base drive is cut, forcing rapid shutdown of the main pass transistor Q1.
It operates as a true high-side switch with no ground-referenced load path, uses inverted logic on ENBL (active-low), and includes internal ESD protection (2000 V HBM). The device remains latched off during over-voltage events and automatically recovers once Vin decays below the threshold - no external reset required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input-Output Voltage | 105 V - Withstands load-dump transients without clamping or failure |
| Continuous Load Current | −300 mA - Supports moderate-power modules without external boost |
| VIO(ON) (100 mA) | 0.2 V (typ) - Minimizes conduction loss and self-heating in power path |
| ENBL Logic | Inverted (active-low) - Enables direct interface with microcontroller GPIO without level-shifting |
| Over-Voltage Threshold | User-set via external Zener - Allows precise trip point tuning for system-specific rail margins |
| Junction Temp Range | −40°C to +125°C - Validated for under-hood automotive operation |
| AEC-Q101 Qualified | Yes - Meets stress-test requirements for automotive electronics reliability |
Pinout & Package
Package: SC-74 (Case 318F), 6-pin surface-mount package with Pb-free finish and AEC-Q101 qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ENBL) | Inverted enable input | Active-low control: device conducts only when ENBL ≤ 13 V; >13 V forces guaranteed off-state |
| 2 (VIN) | High-side input supply | Connects to battery or unregulated rail; handles up to 105 V transient peaks |
| 3 (VOUT) | Switched output | Drives load directly; reverse breakdown rated −0.7 V to protect against back-EMF |
| 4 (VZ) | Zener reference input | Accepts external Zener cathode; sets over-voltage trip threshold via resistor divider |
| 5 (N.C.) | No connection | Internally unconnected; must be left floating or tied to GND per layout guidelines |
| 6 (RBOOST) | Boost current input | Optional connection to increase drive strength for >200 mA loads; not required for ≤200 mA |
Key Features
| Feature | Design Value |
|---|---|
| Active turn-off circuitry | Enables sub-2 µs shutdown response to fast-rising transients (e.g., ISO 7637-2 Pulse 5a) |
| Automatic recovery | Self-resets after transient decay - no manual reset or external timer needed |
| Flexible OVP threshold | Set externally via Zener diode and resistor network - supports 12 V, 24 V, and 48 V systems |
| Guaranteed off-state | ENBL >13 V forces hard cutoff regardless of Vin or load condition - critical for fail-safe isolation |
| Low RDS(on) equivalent | VIO(ON) = 0.2 V @ 100 mA - reduces power loss and thermal stress in compact layouts |
Applications
| Automotive Load-Dump Protection | Industrial Power Distribution |
|---|---|
Use Scenario: Protecting infotainment ECUs from 12 V battery line load-dump transients (ISO 7637-2 Pulse 5). IC Role / Device Role / Timing Role: High-side transient isolator that disconnects load within 1.5 µs of over-voltage detection. Use Value: Prevents latch-up or damage in downstream LDOs and microcontrollers without adding TVS clamping losses. | Use Scenario: Switching 24 V DC power to PLC I/O modules fed from unregulated industrial SMPS. IC Role / Device Role / Timing Role: Regulated-on/off power gate with built-in over-voltage fault response. Use Value: Eliminates need for discrete MOSFET + comparator + driver design; reduces BOM count by ≥4 components. |
| Pre-conditioning for Voltage Regulators | Buffering Sensitive Analog Circuits |
Use Scenario: Stabilizing input to a 3.3 V LDO supplying MCU core logic in automotive body-control modules. IC Role / Device Role / Timing Role: Front-end transient filter and enable-controlled power sequencer. Use Value: Ensures clean startup and prevents brown-out resets caused by upstream rail sag or surge. | Use Scenario: Isolating precision ADC reference buffers from noisy 5 V analog supply rails. IC Role / Device Role / Timing Role: Low-leakage (≤100 nA), low-noise power switch with fast transient rejection. Use Value: Maintains <1 LSB error in 16-bit measurements by blocking supply-induced noise coupling. |
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 |
|---|---|---|---|
| NCP3712ASNT1G | Same die, non-automotive grade; lacks AEC-Q101 qualification and SZ prefix traceability | Approved for commercial/industrial use only; not suitable for automotive production | Select when cost sensitivity outweighs automotive compliance requirements |
| TPS4H160-Q1 | Higher current rating (1.6 A), integrated diagnostics (current sense, fault flag), but requires external FET for >100 V handling | Used in junction-box power distribution with diagnostic feedback; needs external TVS for 105 V transient | Choose when system-level diagnostics and higher current are required, and board space allows added components |
Compared with NCP3712ASNT1G and TPS4H160-Q1, the SZNCP3712ASNT1G delivers optimal balance of transient robustness (105 V), automotive qualification, and minimal external component count - ideal for cost- and space-constrained modules where diagnostics are secondary to fail-safe isolation.
Availability
SZNCP3712ASNT1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial power distribution, and DC-DC pre-conditioning applications requiring stable component supply and long-term lifecycle support.
Supply support for SZNCP3712ASNT1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP37xx family is designed specifically for high-reliability over-voltage protection in automotive and industrial power-switching systems - emphasizing transient immunity, guaranteed off-state safety, and simplified system-level protection architecture.
FAQ
What is the maximum transient voltage the SZNCP3712ASNT1G can withstand?
The SZNCP3712ASNT1G is rated for 105 V peak input-to-output voltage, verified per maximum ratings table. This enables reliable operation during automotive load-dump events (e.g., ISO 7637-2 Pulse 5a) without failure or latch-up. The device achieves this through internal breakdown design and active turn-off - not clamping - making it suitable for systems where energy absorption would cause thermal stress.
Does the SZNCP3712ASNT1G require an external boost resistor for 200 mA loads?
No, the SZNCP3712ASNT1G is capable of switching loads up to 200 mA without an external RBOOST connection, as stated in its features list. RBOOST (Pin 6) is optional and only needed when driving >200 mA loads to ensure sufficient gate drive for the internal pass transistor. For 200 mA and below, the internal drive circuitry provides adequate performance.
How does the SZNCP3712ASNT1G achieve automatic recovery after over-voltage events?
The SZNCP3712ASNT1G monitors Vin continuously against the external Zener-set threshold. When Vin drops below the threshold, internal biasing restores base drive to Q2, re-enabling the pass transistor Q1. No external reset signal or power cycle is required - recovery occurs autonomously once the transient decays, ensuring uninterrupted operation after transient clearance.
Is the SZNCP3712ASNT1G pin-compatible with the NCP3712ASNT1G?
Yes, the SZNCP3712ASNT1G shares identical pinout, electrical specifications, and SC-74 package dimensions with the NCP3712ASNT1G. The "SZ" prefix denotes automotive qualification (AEC-Q101), enhanced traceability, and PPAP capability - all implemented without altering pin function or mechanical footprint.
What is the guaranteed off-state voltage threshold on the ENBL pin for the SZNCP3712ASNT1G?
The SZNCP3712ASNT1G guarantees off-state operation when ENBL voltage exceeds 13 V, as specified in the "Guaranteed 'Off' State 'ENBL NOT' Voltage" parameter. This ensures fail-safe isolation even if the microcontroller output rises due to fault conditions - a critical feature for automotive safety-critical power gating.
SZNCP3712ASNT1G 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
SZNCP3712ASNT1G FAQ
1.How can I place an order for SZNCP3712ASNT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNCP3712ASNT1G 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 SZNCP3712ASNT1G reliable?
The price and inventory of SZNCP3712ASNT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNCP3712ASNT1G is usually 5 days.
3.What payment methods are accepted for SZNCP3712ASNT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNCP3712ASNT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNCP3712ASNT1G?
SZNCP3712ASNT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNCP3712ASNT1G 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 SZNCP3712ASNT1G?
For technical support, including SZNCP3712ASNT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNCP3712ASNT1G requirements.
6.How does Aetrix verify that SZNCP3712ASNT1G is sourced from the original manufacturer or authorized distributors?
All SZNCP3712ASNT1G 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 SZNCP3712ASNT1G meets industry standards.
7.What is the process for return or replacement of SZNCP3712ASNT1G?
All SZNCP3712ASNT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZNCP3712ASNT1G, 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 SZNCP3712ASNT1G part is unused and in its original packaging.
Return procedure for SZNCP3712ASNT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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