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onsemi SZMMQA20VT1G
- Part No.:
- SZMMQA20VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZMMQA20VT1G.pdf
- Description:
- SURGE PROTECTOR, COMMON ANODE, S
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
SZMMQA20VT1G 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 delivers 20 V nominal Zener voltage (VZT = 19–21 V), clamps at ≤28.6 V under 1.0 A peak pulse current, and supports 150 W peak power at 20 µs per IEC 61000-4-5 waveform - ideal for protecting USB, HDMI, and GPIO interfaces in space-constrained industrial controllers.
For engineers reviewing the SZMMQA20VT1G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, validated SC-74 terminal mapping, real-world interface protection use cases, and two AEC-Q101-qualified alternatives with documented clamping and leakage differences.
Technical Context
This device implements four unidirectional Zener junctions sharing a common anode (pins 2 and 5), enabling simultaneous protection of four signal paths without cross-talk. Its low 0.84 mV/°C temperature coefficient ensures stable clamping across −55 °C to +150 °C operating range.
It meets Class 3B ESD immunity (>16 kV HBM) and sustains 150 W non-repetitive surge power at 20 µs pulse width while maintaining <75 nA reverse leakage at rated voltage - critical for low-power sensor interfaces and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 19–21 V at 1.0 mA test current - defines precise clamping threshold for 20 V rail protection |
| Max Clamping Voltage (VRSM) | 28.6 V at 1.0 A peak pulse - limits transient energy delivered to downstream ICs |
| Peak Pulse Power (20 µs) | 150 W - handles IEC 61000-4-5 Level 3 surges without degradation |
| Reverse Leakage Current | <75 nA at 15 V - preserves signal integrity in high-impedance analog/sensor inputs |
| ESD Rating (HBM) | >16 kV Class 3B - exceeds JEDEC JS-001 requirements for end-equipment robustness |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in automotive under-hood and industrial motor drive environments |
| Capacitance @ 0 V | 20.1 pF - enables use on high-speed data lines up to ~500 Mbps without signal distortion |
Pinout & Package
SC-74 (Case 318F) surface-mount package: 6-pin, 2.2 mm × 2.2 mm × 1.0 mm body, Pb-free, RoHS-compliant, optimized for automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected signal line 1 input; connects to I/O trace before ESD event |
| 2 | Anode (Common) | Shared anode node tied to system ground or local reference plane |
| 3 | Cathode (Channel B) | Protected signal line 2 input; electrically isolated from Channel A |
| 4 | Cathode (Channel C) | Protected signal line 3 input; independent junction with same VZ spec |
| 5 | Anode (Common) | Redundant common anode connection for improved thermal distribution and layout flexibility |
| 6 | Cathode (Channel D) | Protected signal line 4 input; completes quad-channel protection in single footprint |
Key Features
| Feature | Design Value |
|---|---|
| Quad common-anode architecture | Four independent unidirectional ESD paths share one ground return - reduces PCB area by 75% vs. discrete diodes |
| 150 W peak surge capability (20 µs) | Withstands repeated IEC 61000-4-5 surges without parameter shift - extends field life in industrial gateways |
| 20.1 pF capacitance @ 0 V | Minimizes insertion loss on 3.3 V UART, SPI, and I²C buses - avoids timing skew or false triggering |
| AEC-Q101 qualification | Validated for automotive infotainment and ADAS sensor interfaces requiring zero latent failure in vibration/thermal cycling |
| Low 0.84 mV/°C tempco | Clamping voltage drift <±0.4 V over full −55 °C to +150 °C range - ensures consistent protection in engine control units |
Applications
| USB 2.0 Interface Protection | HDMI DDC Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines in portable medical monitors against ESD events during cable hot-plug. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and USB transceiver IC. Use Value: 20.1 pF capacitance prevents signal rise-time degradation; 28.6 V clamping prevents transceiver latch-up during ±15 kV contact discharge. |
Use Scenario: Safeguarding HDMI DDC clock/data lines in digital signage controllers exposed to handling ESD in retail environments. IC Role / Device Role / Timing Role: Quad-channel ESD clamp on SDA/SCL/CEC/HEAC lines, sharing common ground return. Use Value: Single SC-74 package replaces four discrete diodes - saves 3.2 mm² board area while maintaining <1 ns response time. |
| Industrial PLC I/O Protection | Automotive Body Control Module |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Common-anode TVS array connected between each input line and chassis ground. Use Value: 150 W 20 µs surge rating absorbs energy from inductive load switching transients without degradation over 10⁵ cycles. |
Use Scenario: Protecting LIN bus and sensor inputs in body control modules subjected to ISO 10605 ESD pulses during vehicle assembly. IC Role / Device Role / Timing Role: AEC-Q101-qualified ESD suppressor on door module switch inputs and ambient light sensor lines. Use Value: −55 °C to +150 °C operation ensures reliability under hood; 75 nA leakage prevents battery drain in always-on circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5V3U2U-2/TR | Lower 5.3 V VZ, 12 pF capacitance, 30 W peak power (1 ms) | Better suited for 3.3 V logic rails; insufficient for 20 V analog sensor protection | Select when protecting low-voltage digital I/O only - not a drop-in replacement for SZMMQA20VT1G's 20 V clamping requirement |
| SZMMQA18VT1G | 18 V nominal VZ (17.1–18.9 V), identical SC-74 pinout and thermal specs | Used where lower clamping threshold is required for 18 V supply domains | Direct pin-compatible alternative if system design allows 18 V instead of 20 V clamping - same layout, no requalification needed |
Compared with ESD5V3U2U-2/TR and SZMMQA18VT1G, SZMMQA20VT1G uniquely balances 20 V clamping precision, 150 W surge capacity, and quad-channel integration - making it optimal for mixed-signal industrial interfaces where both voltage headroom and space constraints are critical.
Availability
SZMMQA20VT1G is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, USB 2.0 interface hardening, and HDMI DDC line safeguarding requiring stable component supply across extended product lifecycles.
Supply support for SZMMQA20VT1G 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.
SZMMQA20VT1G belongs to the MMQA/SZMMQA Quad Common Anode Series - engineered specifically for compact, multi-line ESD protection in high-density PCBs where minimizing footprint and maximizing surge resilience are primary design goals.
FAQ
What is the exact Zener voltage tolerance for SZMMQA20VT1G?
The SZMMQA20VT1G has a guaranteed breakdown voltage range of 19.0 V to 21.0 V at 1.0 mA test current (VZT), per the onsemi datasheet Rev. 13. This ±5% tolerance ensures predictable clamping behavior across manufacturing lots and temperature extremes, critical for compliance with IEC 61000-4-5 surge immunity testing when used in 20 V system protection.
Does SZMMQA20VT1G support bidirectional ESD protection?
No - SZMMQA20VT1G is strictly unidirectional due to its common-anode configuration. It protects signals referenced to ground only. For bidirectional protection (e.g., AC-coupled lines), a dual-rail solution using two SZMMQA20VT1G devices or a dedicated bidirectional array like NUP4105MR6T1G would be required.
What is the maximum allowable PCB trace length between SZMMQA20VT1G and protected I/O pins?
To maintain effective ESD suppression, PCB trace inductance must be minimized: keep traces from SZMMQA20VT1G cathodes to protected lines under 5 mm, and route the common anode (pins 2 and 5) directly to a low-inductance ground plane. Longer traces increase clamping voltage overshoot during 1 ns ESD transients, potentially exceeding downstream IC absolute maximum ratings.
Is SZMMQA20VT1G qualified for automotive applications?
Yes - SZMMQA20VT1G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It is approved for use in automotive body electronics, infotainment, and sensor interfaces where operation from −40 °C to +125 °C ambient and resistance to mechanical shock/vibration are mandatory.
How does the dual-anode pin configuration (pins 2 and 5) improve thermal performance?
The dual-anode layout in SZMMQA20VT1G provides parallel current paths to ground, reducing total thermal resistance by ~12% compared to single-anode equivalents. This allows sustained 150 W surge dissipation without exceeding the 150 °C junction limit, especially beneficial in thermally constrained layouts like multilayer automotive PCBs with limited copper pour area.
SZMMQA20VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- SZMMQA
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V (Max)
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- 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
SZMMQA20VT1G FAQ
1.How can I place an order for SZMMQA20VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMQA20VT1G 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 SZMMQA20VT1G reliable?
The price and inventory of SZMMQA20VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMQA20VT1G is usually 5 days.
3.What payment methods are accepted for SZMMQA20VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMQA20VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMQA20VT1G?
SZMMQA20VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMQA20VT1G 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 SZMMQA20VT1G?
For technical support, including SZMMQA20VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMQA20VT1G requirements.
6.How does Aetrix verify that SZMMQA20VT1G is sourced from the original manufacturer or authorized distributors?
All SZMMQA20VT1G 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 SZMMQA20VT1G meets industry standards.
7.What is the process for return or replacement of SZMMQA20VT1G?
All SZMMQA20VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMQA20VT1G, 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 SZMMQA20VT1G part is unused and in its original packaging.
Return procedure for SZMMQA20VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMQA20VT1G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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ESD5Z3.3T1G
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D5V0H1B2LP-7B
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D5V0P1B2LP-7B
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DESD5V0U1BA-7
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ESD5Z5.0T1G
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
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D5V0L1B2WS-7
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