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onsemi SZMMQA15VT1G
- Part No.:
- SZMMQA15VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZMMQA15VT1G.pdf
- Description:
- TVS DIODE 11VWM 21.7VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:9,258
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Product details
Overview
SZMMQA15VT1G from onsemi is a quad monolithic common-anode ESD protection diode in SC-74 package, designed for transient overvoltage suppression on four independent signal lines. It features 15 V nominal Zener voltage (14.3–15.8 V), 21.7 V maximum clamping voltage at 1.1 A peak pulse current, and 150 W peak power dissipation (20 µs waveform), targeting USB, keyboard, and microprocessor I/O line protection in space-constrained consumer and industrial electronics.
For engineers reviewing the SZMMQA15VT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SC-74 terminal mapping, real-world use cases in interface protection, and validated alternative parts with documented parameter differences.
Technical Context
This device implements a quad unidirectional common-anode configuration: pins 2 and 5 serve as shared anodes, while pins 1, 3, 4, and 6 are individual cathodes-enabling four independent ESD paths to ground without external components. Its silicon junction design meets AEC-Q101 for automotive-grade reliability and supports Class 3B HBM ESD rating (>16 kV).
Thermal performance is defined for FR-5 board (RJA = 556 °C/W) and alumina substrate (RJA = 417 °C/W), with junction temperature range −55 °C to +150 °C. Clamping behavior is specified per Figure 5 (10×1000 µs) and Figure 6 (8×20 µs) waveforms, ensuring predictable surge response in fast-transient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 14.3–15.8 V @ 1.0 mA test current - defines precise breakdown threshold for overvoltage triggering |
| Clamping Voltage (VRSM) | 21.7 V @ 1.1 A peak pulse - limits line voltage during ESD event to protect downstream ICs |
| Peak Pulse Power | 150 W @ 20 µs waveform - sustains high-energy transients without failure |
| Reverse Leakage (IR) | <75 nA @ 11 V - ensures minimal signal distortion and power loss in standby |
| ESD Rating (HBM) | >16 kV Class 3B - exceeds IEC 61000-4-2 Level 4 for robust system-level ESD immunity |
| Junction Temp Range | −55 °C to +150 °C - supports operation in automotive under-hood and industrial control environments |
| Package | SC-74 (Case 318F) - 6-pin surface-mount footprint occupying only 2.9 mm × 1.6 mm PCB area |
Pinout & Package
SC-74 package (Case 318F, Style 1) is a 6-pin, lead-free, void-free thermosetting plastic housing optimized for automated assembly and high-density layouts. Pin 1 and Pin 3–6 are cathodes; Pins 2 and 5 are common anodes - enabling four independent unidirectional ESD paths sharing two anode connections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | ESD current path for first protected line; connects to I/O trace, then to ground via PCB layout |
| 2 | Anode (Common) | Shared anode node for Channels A, B, C, D - tied to local ground plane or low-impedance return |
| 3 | Cathode (Channel B) | Second independent ESD path; electrically isolated from other cathodes except through common anode |
| 4 | Cathode (Channel C) | Third protected line; allows simultaneous protection of multiple data or control signals in one footprint |
| 5 | Anode (Common) | Redundant anode connection enhancing current-handling capability and thermal distribution |
| 6 | Cathode (Channel D) | Fourth ESD path; completes quad-channel protection without additional discrete devices or routing complexity |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Topology | Four independent unidirectional ESD paths in single SC-74 package - reduces component count and PCB area by 75% vs. discrete diodes |
| 150 W Peak Pulse Power (20 µs) | Withstands high-energy surges per IEC 61000-4-5 Ring Wave without degradation - critical for industrial port protection |
| AEC-Q101 Qualified | Validated for automotive applications including infotainment and body control modules - includes PPAP documentation support |
| Low Capacitance (16 pF) | Minimizes signal integrity impact on high-speed lines such as USB 2.0 or UART up to 12 Mbps |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and reflow soldering profiles up to 260 °C peak temperature |
Applications
| USB Interface Protection | Keyboard/Keypad ESD Guard |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports against contact discharge and cable-induced transients. IC Role / Device Role / Timing Role: Unidirectional clamping diode array providing low-capacitance, fast-response overvoltage suppression before the USB transceiver. Use Value: Prevents latch-up and permanent damage to USB PHY ICs while maintaining signal rise/fall times under 1 ns due to 16 pF capacitance. |
Use Scenario: Shielding matrix-scanned keyboard rows/columns from ESD events during user interaction in office peripherals. IC Role / Device Role / Timing Role: Quad-channel common-anode ESD suppressor placed at connector entry point for each key line. Use Value: Eliminates need for four separate SOD-323 diodes, saving >2.5 mm² PCB area and reducing BOM count by 75%. |
| Microprocessor I/O Bus Protection | Industrial Sensor Interface Guard |
|
Use Scenario: Safeguarding address/data/control bus lines (e.g., GPIO, SPI, I²C) of embedded microcontrollers in medical and test equipment. IC Role / Device Role / Timing Role: Low-leakage (<75 nA) clamping device placed directly at MCU pin to limit voltage excursions during handling or field surges. Use Value: Ensures reliable reset and communication integrity by clamping transients to ≤21.7 V before internal protection diodes activate. |
Use Scenario: Protecting analog and digital sensor inputs (e.g., temperature, pressure, proximity) in factory automation systems exposed to relay switching noise. IC Role / Device Role / Timing Role: Transient voltage suppressor on sensor signal lines connected to ADC inputs or microcontroller GPIOs. Use Value: Maintains measurement accuracy by limiting input overvoltage to 21.7 V while contributing only 16 pF loading to <100 kHz sensor bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA12VT1G | 12 V nominal Zener voltage (11.4–12.6 V); 17.3 V clamping at 1.39 A - lower trigger and clamp thresholds | Better suited for 3.3 V logic rails where tighter voltage margin is required; higher leakage (75 nA same) | Select when protecting 3.3 V interfaces needing earlier clamping; verify system tolerance to 17.3 V max clamp |
| SZMMQA18VT1G | 18 V nominal Zener voltage (17.1–18.9 V); 26 V clamping at 0.923 A - higher voltage headroom | Ideal for 5 V or 12 V supply domains with larger transient margins; slightly lower peak pulse current rating | Choose for 5 V microcontroller I/O or industrial 12 V sensor lines where 26 V clamp is acceptable |
Compared with SZMMQA15VT1G, SZMMQA12VT1G offers earlier activation for low-voltage rails but less margin above 3.3 V supply, while SZMMQA18VT1G provides greater headroom for 5 V systems at the cost of higher clamping voltage - selection depends on target rail voltage and allowable transient ceiling.
Availability
SZMMQA15VT1G is available at Aetrix Electronics and suitable for USB interface protection, keyboard ESD guard, and microprocessor I/O bus protection requiring stable component supply across automotive, industrial, and consumer production programs.
Supply support for SZMMQA15VT1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMQA15VT1G belongs to the MMQA/SZMMQA Quad Common Anode Series - engineered specifically for compact, multi-line ESD protection in space-constrained PCBs used in computing, communications, and automotive electronics.
FAQ
What is the exact Zener voltage range for SZMMQA15VT1G?
The SZMMQA15VT1G has a guaranteed Zener voltage range of 14.3 V to 15.8 V at 1.0 mA test current (VZT), measured per JEDEC JESD201 standards. This tight tolerance ensures consistent overvoltage triggering across production lots and operating temperatures from −55 °C to +150 °C.
Does SZMMQA15VT1G support bidirectional ESD protection?
No, SZMMQA15VT1G is strictly unidirectional - configured as a common-anode quad diode array. It protects against positive transients on cathode lines referenced to the shared anode (ground). For bidirectional protection, a dual-diode array like NUP4105MR6T1G would be required.
What is the maximum clamping voltage of SZMMQA15VT1G under ESD stress?
The maximum clamping voltage of SZMMQA15VT1G is 21.7 V at 1.1 A peak pulse current (IRSM), per the 8×20 µs waveform defined in Figure 6 of the datasheet. This value is guaranteed across temperature and represents the upper limit seen by protected circuitry during worst-case ESD events.
Is SZMMQA15VT1G qualified for automotive applications?
Yes, SZMMQA15VT1G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and ESD robustness required for automotive infotainment, body control, and ADAS subsystems.
How does the SC-74 package of SZMMQA15VT1G reduce PCB area versus discrete diodes?
The SC-74 package of SZMMQA15VT1G measures 2.9 mm × 1.6 mm and integrates four ESD channels in one footprint - replacing four discrete SOD-323 diodes (each ~3.0 mm × 1.7 mm) and saving over 12 mm² total board area while eliminating four solder joints and routing stubs.
SZMMQA15VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- MMQA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V (Max)
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.7V
- Current - Peak Pulse (10/1000µs):
- 1.1A (8/20µs)
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZMMQA15VT1G FAQ
1.How can I place an order for SZMMQA15VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMQA15VT1G 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 SZMMQA15VT1G reliable?
The price and inventory of SZMMQA15VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMQA15VT1G is usually 5 days.
3.What payment methods are accepted for SZMMQA15VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMQA15VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMQA15VT1G?
SZMMQA15VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMQA15VT1G 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 SZMMQA15VT1G?
For technical support, including SZMMQA15VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMQA15VT1G requirements.
6.How does Aetrix verify that SZMMQA15VT1G is sourced from the original manufacturer or authorized distributors?
All SZMMQA15VT1G 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 SZMMQA15VT1G meets industry standards.
7.What is the process for return or replacement of SZMMQA15VT1G?
All SZMMQA15VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMQA15VT1G, 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 SZMMQA15VT1G part is unused and in its original packaging.
Return procedure for SZMMQA15VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMQA15VT1G Tags
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D12V0L1B2LP-7B
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