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onsemi SZMMBZH12VAWT1G
- Part No.:
- SZMMBZH12VAWT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
SZMMBZH12VAWT1G.pdf
- Description:
- TVS DIODE 8.5VWM 17VC SC70
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SZMMBZH12VAWT1G from onsemi is a dual common-anode Zener diode array in SC-70 package, rated for 40 W peak pulse power at 1.0 ms, 12 V nominal Zener breakdown (11.4–12.6 V), and 175 °C maximum junction temperature. It provides bidirectional or unidirectional ESD/transient protection for two signal lines in space-constrained high-reliability systems such as industrial communication interfaces and medical sensor front-ends.
For engineers reviewing the SZMMBZH12VAWT1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (17 V @ 2.35 A), working reverse voltage (8.5 V), leakage (<200 nA @ 8.5 V), ESD rating (Class 3B >16 kV HBM), and dual-line protection capability in a single SC-70 footprint.
Technical Context
This device integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling either independent unidirectional protection of two lines (Pins 1–3 and 2–3) or combined bidirectional protection across Pins 1–2. Its thermal design supports continuous operation up to 175 °C TJ, with 605 °C/W junction-to-ambient resistance on FR-5 board.
Clamping behavior follows IEC 61000-4-2 surge waveform compliance, delivering 17 V VC at 2.35 A IPP under 1.0 ms pulse. The −55 °C to +175 °C operating range and UL 94 V-0 flammability rating confirm suitability for automotive-grade and mission-critical embedded environments where board area and thermal margin are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 11.4–12.6 V @ 1.0 mA - defines precise overvoltage threshold for line protection |
| Clamping Voltage (VC) | 17 V @ 2.35 A IPP - limits transient voltage seen by downstream ICs during ESD events |
| Working Reverse Voltage (VRWM) | 8.5 V - maximum continuous DC voltage before significant leakage or conduction begins |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - sustains high-energy transients without failure per Figure 5 waveform |
| ESD Rating (HBM) | Class 3B (>16 kV) - meets IEC 61000-4-2 Level 4 for robust system-level ESD immunity |
| Junction Temp Max (TJ) | 175 °C - enables deployment in under-hood automotive or high-ambient industrial enclosures |
| Leakage Current (IR) | <200 nA @ 8.5 V - ensures minimal standby power loss and signal integrity in low-current analog paths |
Pinout & Package
SC-70 (SOT-323) package, 3-pin, void-free thermosetting plastic case with corrosion-resistant finish; optimized for automated placement and reflow soldering at 260 °C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First protected line cathode connection; used with Pin 3 (anode) for unidirectional clamp |
| Pin 2 | Cathode 2 | Second protected line cathode connection; shares Pin 3 anode for dual-line protection |
| Pin 3 | Common Anode | Shared anode node enabling compact dual-channel layout; required for both unidirectional configurations |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Reduces PCB real estate by 50% vs. discrete dual-Zener solutions while maintaining independent line control |
| 40 W peak pulse rating | Withstands IEC 61000-4-5 surges up to 2.35 A without degradation in FR-5 board layout |
| 175 °C TJ(max) rating | Supports uninterrupted operation in engine control units, motor drives, and sealed industrial sensors |
| UL 94 V-0 flammability | Meets safety standards for enclosed medical and industrial equipment requiring non-propagating flame resistance |
| Pb-free SC-70 package | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Industrial Sensor Interface | Automotive CAN Transceiver Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor placed directly at connector entry point before ADC input stage. Use Value: Clamps fast ESD spikes to ≤17 V, preserving 12-bit measurement accuracy and preventing latch-up in downstream op-amps. |
Use Scenario: Safeguarding CAN_H and CAN_L pins of ISO 11898-2 compliant transceivers in body control modules. IC Role / Device Role / Timing Role: Common-anode dual Zener providing symmetrical bidirectional clamping between differential bus lines. Use Value: Maintains <10 ns response time and <0.5 pF inter-line capacitance to avoid CAN bit timing distortion at 500 kbps. |
| Medical Patient Monitor ECG Inputs | POS Terminal Keypad Interface |
Use Scenario: Shielding low-noise instrumentation amplifiers in Class II medical ECG front-ends from electrostatic discharge. IC Role / Device Role / Timing Role: Unidirectional Zener pair (Pin 1–3 and Pin 2–3) guarding isolated analog inputs against HBM events. Use Value: Delivers <200 nA leakage at 8.5 V to prevent DC offset drift and preserves sub-μV signal integrity. |
Use Scenario: Protecting membrane keypad scan lines in retail point-of-sale terminals exposed to frequent operator contact. IC Role / Device Role / Timing Role: Dual Zener array suppressing contact-induced transients on row/column matrix lines before microcontroller GPIOs. Use Value: Enables >1 million keystroke reliability with no firmware reset events due to ESD-induced MCU resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZH12VAWT1G | No automotive qualification; lacks SZ prefix; not AEC-Q200 stress-tested | Approved for commercial/industrial use only; excluded from automotive production BOMs | Select when cost sensitivity outweighs automotive qualification requirements and ambient temperature stays ≤125 °C |
| SZMMBZH15VAWT1G | Higher 15 V nominal Zener voltage (14.25–15.75 V); lower clamping voltage (21 V @ 1.9 A) | Better suited for 12 V rail protection where higher VRWM prevents false triggering on ripple | Choose when protecting 12 V logic buses with tighter noise margins and need ≥12 V working voltage headroom |
Compared with MMBZH12VAWT1G and SZMMBZH15VAWT1G, the SZMMBZH12VAWT1G uniquely combines automotive qualification (SZ prefix), 12 V precision clamping, and 175 °C operation-making it the only option for high-temp automotive sensor nodes requiring exact 12 V threshold alignment.
Availability
SZMMBZH12VAWT1G is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN transceiver protection, and medical ECG input stages requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned sourcing.
Supply support for SZMMBZH12VAWT1G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SZMMBZHxxVAWT1G series belongs to onsemi's high-temperature transient voltage suppression portfolio, engineered specifically for dual-line ESD protection in space-constrained, high-reliability applications demanding AEC-Q200 compliance and extended thermal operation.
FAQ
What is the maximum clamping voltage of SZMMBZH12VAWT1G under standard IEC 61000-4-2 ESD conditions?
The SZMMBZH12VAWT1G exhibits a maximum clamping voltage (VC) of 17 V at 2.35 A peak pulse current (IPP), measured using the 1.0 ms rectangular waveform defined in Figure 5 of its datasheet. This value ensures downstream circuitry remains within safe voltage limits during Class 3B (>16 kV) human-body-model ESD events. The SZMMBZH12VAWT1G maintains this performance across its full operating temperature range up to 175 °C.
Does SZMMBZH12VAWT1G support bidirectional transient protection, and how is it configured?
Yes, the SZMMBZH12VAWT1G supports bidirectional protection by connecting external circuitry between Pin 1 (Cathode 1) and Pin 2 (Cathode 2), with Pin 3 (Common Anode) grounded or referenced to system ground. This configuration leverages both Zener junctions symmetrically to clamp positive and negative transients across the protected differential pair. The SZMMBZH12VAWT1G achieves this without additional components, reducing bill-of-materials count in CAN or RS-485 interface designs.
What is the working peak reverse voltage (VRWM) specification for SZMMBZH12VAWT1G, and why does it differ from the nominal Zener voltage?
The SZMMBZH12VAWT1G has a VRWM of 8.5 V, which is intentionally set below its nominal Zener breakdown voltage (12 V) to ensure reliable blocking of normal operating voltages while allowing controlled conduction only during overvoltage events. This 3.5 V margin prevents false triggering from power supply ripple or noise. The SZMMBZH12VAWT1G's VRWM is verified at 25 °C with <200 nA leakage, confirming stable DC blocking behavior in analog sensor signal paths.
Is SZMMBZH12VAWT1G qualified for automotive applications, and what evidence supports this claim?
Yes, the SZMMBZH12VAWT1G carries the "SZ" prefix per onsemi's ordering nomenclature, indicating compliance with automotive-specific site controls, change management, and AEC-Q200 stress testing requirements. Its 175 °C maximum junction temperature rating, Pb-free SC-70 packaging, and inclusion in onsemi's automotive-grade Zener portfolio confirm eligibility for under-hood and chassis-mounted ECUs. The SZMMBZH12VAWT1G datasheet explicitly references AEC-Q release availability for related variants.
How does the thermal resistance (RJA) of SZMMBZH12VAWT1G impact its power derating in real-world PCB layouts?
The SZMMBZH12VAWT1G has a specified RJA of 605 °C/W on FR-5 board, meaning each watt of dissipated power raises junction temperature by 605 °C above ambient. At 25 °C ambient, its 225 mW steady-state power limit drops linearly by 1.5 mW/°C above that point-reaching zero derated power at ~175 °C. This requires careful copper pour design around Pins 1–3 in high-density layouts. The SZMMBZH12VAWT1G's thermal profile is validated per Figure 4, ensuring predictable lifetime in thermally constrained enclosures.
SZMMBZH12VAWT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 2.35A
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
SZMMBZH12VAWT1G FAQ
1.How can I place an order for SZMMBZH12VAWT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZH12VAWT1G 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 SZMMBZH12VAWT1G reliable?
The price and inventory of SZMMBZH12VAWT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZH12VAWT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZH12VAWT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZH12VAWT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZH12VAWT1G?
SZMMBZH12VAWT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZH12VAWT1G 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 SZMMBZH12VAWT1G?
For technical support, including SZMMBZH12VAWT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZH12VAWT1G requirements.
6.How does Aetrix verify that SZMMBZH12VAWT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZH12VAWT1G 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 SZMMBZH12VAWT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZH12VAWT1G?
All SZMMBZH12VAWT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZH12VAWT1G, 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 SZMMBZH12VAWT1G part is unused and in its original packaging.
Return procedure for SZMMBZH12VAWT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZH12VAWT1G Tags
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