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onsemi MMQA20VT3
- Part No.:
- MMQA20VT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA20VT3.pdf
- Description:
- TVS DIODE 15VWM 28.6VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:6,349
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Product details
Overview
MMQA20VT3 from ON Semiconductor is a quad monolithic common-anode ESD protection diode in SC−74 package, rated for 20 V nominal Zener voltage, 28.6 V clamping voltage at 1.0 A peak pulse current, and 150 W peak power dissipation (20 µs waveform). It protects four independent I/O lines with low leakage (<75 nA), 16 kV HBM ESD rating, and 100 pF capacitance at 0 V - ideal for space-constrained USB, HDMI, and microprocessor interface protection.
For engineers reviewing the MMQA20VT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SC−74 terminal mapping, real-world clamping behavior under transient stress, and direct alternative options for ESD-sensitive digital interfaces requiring compact, high-surge-capability unidirectional TVS arrays.
Technical Context
This device implements four independent unidirectional Zener junctions sharing a common anode (pins 2 and 5), enabling simultaneous protection of four signal lines referenced to a shared ground or supply rail. Its design targets fast transient suppression per IEC 61000-4-2 (Class 3B) and IEC 61000-4-5 surge immunity requirements.
Clamping performance is defined by 28.6 V maximum at 1.0 A (10/1000 µs waveform) and 20.1 V maximum reverse standoff voltage, with thermal resistance of 556 °C/W on FR-5 board. The 100 pF junction capacitance supports data rates up to ~100 Mbps without signal integrity degradation in low-speed serial links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19–21 V (min–max at 1.0 mA); ensures reliable turn-on before damage to 3.3 V/5 V logic interfaces |
| Clamping Voltage (VC) | 28.6 V max @ 1.0 A (10/1000 µs); limits downstream IC voltage stress during ESD events |
| Peak Pulse Power | 150 W @ 20 µs (8/20 µs waveform); handles IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) |
| Reverse Leakage | <75 nA @ 20.1 V; prevents signal loading or battery drain in always-on sensor interfaces |
| ESD Rating | ±16 kV HBM (Class 3B); exceeds JEDEC JS-001-2017 for handheld and peripheral ports |
| Junction Capacitance | 100 pF @ 0 V, 1 MHz; compatible with USB 2.0, RS-232, and industrial control bus speeds |
| Package | SC−74 (Case 318F); 3.0 × 1.5 mm footprint enables 4-line protection in <4.5 mm² PCB area |
Pinout & Package
SC−74 package (Case 318F, 6-pin) with void-free thermosetting plastic body, Pb-free finish, and optimized lead geometry for automated reflow assembly. Dimensions: 3.00 mm × 1.50 mm × 1.10 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected line output for first I/O path; connects to signal trace before connector |
| 2 | Common Anode | Shared reference node tied to system ground or VCC; defines unidirectional conduction direction |
| 3 | Cathode (Channel B) | Protected line output for second I/O path; electrically isolated from Pin 1 |
| 4 | Cathode (Channel C) | Protected line output for third I/O path; supports independent routing on dense PCBs |
| 5 | Common Anode | Redundant anode connection for improved current sharing and lower thermal resistance |
| 6 | Cathode (Channel D) | Protected line output for fourth I/O path; completes quad-channel protection array |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent unidirectional TVS paths share two anode pins (2 & 5), reducing component count and layout complexity for multi-line interfaces |
| 150 W Peak Pulse Power (20 µs) | Withstands 8/20 µs surges up to 12 A (calculated from VRSM = 20.1 V), meeting IEC 61000-4-5 Level 3 requirements |
| Low 100 pF Junction Capacitance | Minimizes signal rise-time degradation on 480 Mbps USB 2.0 differential pairs when placed near connectors |
| 16 kV HBM ESD Robustness | Eliminates need for secondary ESD protection on exposed ports like keyboard/mouse headers or industrial I/O terminals |
| SC−74 Footprint Efficiency | Replaces four discrete SOD-323 diodes (total ~12 mm²) with single 4.5 mm² package, freeing >60% board area |
Applications
| USB 2.0 Port Protection | Industrial I/O Terminal Protection |
|---|---|
|
Use Scenario: Protecting D+ and D− lines, VBUS, and ID pins on embedded USB host/device connectors subject to frequent hot-plug and ESD exposure. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor clamping overvoltage spikes before they reach USB transceiver PHY. Use Value: Prevents latch-up or permanent damage to USB controller ICs while maintaining signal integrity via 100 pF capacitance and sub-29 V clamping. |
Use Scenario: Safeguarding 24 VDC digital input channels on PLC modules connected to field sensors and actuators prone to inductive switching transients. IC Role / Device Role / Timing Role: Quad-channel ESD/surge clamp absorbing 1 kV/500 A transients induced by relay coil de-energization or cable coupling. Use Value: Enables single-package protection of four inputs without compromising response time (<1 ns) or derating due to thermal coupling between channels. |
| Microprocessor Bus Protection | HDMI DDC/CEC Line Protection |
|
Use Scenario: Shielding address/data/control buses (e.g., GPIO, SPI, I²C) on ARM-based edge controllers exposed to handling ESD during field maintenance. IC Role / Device Role / Timing Role: Low-leakage (75 nA) Zener array suppressing ±8 kV contact discharge without affecting logic high/low thresholds. Use Value: Maintains bus reliability across −40°C to +125°C ambient while occupying <4.5 mm² - critical for fanless industrial compute modules. |
Use Scenario: Securing HDMI DDC (I²C) and CEC control lines against ESD from user-accessible ports in smart TVs and AV receivers. IC Role / Device Role / Timing Role: High-speed transient suppressor with 100 pF capacitance preserving 100 kHz I²C timing margins and preventing false CEC command triggering. Use Value: Delivers Class 3B ESD immunity without adding series resistance or RC filtering that would violate HDMI compliance timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA20VT3G | AEC-Q101 qualified; identical electrical specs but with automotive-grade process controls and PPAP documentation support | Required for automotive infotainment head unit USB/HDMI ports; not needed for industrial or consumer use | Select SZMMQA20VT3G only if automotive qualification (e.g., ISO/TS 16949 production) is mandated |
| TPD4E001DPYR | Lower clamping (14 V @ 1 A), higher capacitance (12 pF per channel), quad-channel, same SC-70 package | Better suited for high-speed data lines (e.g., USB 3.0 Rx/Tx) where low capacitance dominates over high-voltage clamping | Choose TPD4E001DPYR when protecting 3.3 V logic with strict <15 pF budget; MMQA20VT3 remains optimal for 20 V standoff and 150 W surge handling |
Compared with SZMMQA20VT3G, MMQA20VT3 offers identical protection performance with standard industrial qualification; versus TPD4E001DPYR, MMQA20VT3 provides 2.0× higher clamping voltage margin and 12× greater surge power handling - making it superior for 24 V industrial I/O and legacy interface protection where speed is secondary to robustness.
Availability
MMQA20VT3 is available at Aetrix Electronics and suitable for USB 2.0 port protection, industrial PLC I/O terminals, and microprocessor bus safeguarding requiring stable component supply across long-lifecycle embedded programs.
Supply support for MMQA20VT3 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MMQA series belongs to ON Semiconductor's ESD and transient voltage suppression product line, engineered specifically for compact, high-reliability protection of multi-line digital interfaces in space-constrained and harsh electrical environments.
FAQ
What is the exact Zener voltage tolerance for MMQA20VT3?
The MMQA20VT3 has a guaranteed Zener voltage range of 19.0 V to 21.0 V at test current IT = 1.0 mA, measured per ANSI/IEEE Std 1012. This 10% tolerance ensures consistent turn-on behavior across production lots and temperature extremes from −55°C to +150°C, critical for predictable clamping in safety-critical industrial controls where MMQA20VT3 is deployed.
Does MMQA20VT3 support bidirectional transient suppression?
No, MMQA20VT3 is strictly unidirectional due to its common-anode architecture - it conducts only when cathode voltage exceeds anode voltage by ≥19 V. For bidirectional protection (e.g., AC-coupled lines), two MMQA20VT3 devices must be used back-to-back, or a dedicated bidirectional array like SMBJ20A should be selected instead of MMQA20VT3.
What is the maximum allowable PCB trace length between MMQA20VT3 and the protected I/O connector?
To maintain effective ESD suppression, PCB trace inductance must be minimized: maximum recommended trace length from MMQA20VT3 cathode pins to connector pads is 5 mm. Longer traces increase impedance, delaying clamping response and allowing voltage overshoot beyond the 28.6 V spec - a key layout constraint confirmed in ON Semiconductor's AN-1012 application note for MMQA20VT3.
Can MMQA20VT3 replace four individual SMAJ20A diodes in a design?
Yes, MMQA20VT3 replaces four discrete SMAJ20A diodes functionally and electrically, but not mechanically: SMAJ20A uses DO-214AC (SMA) package (4.5 × 2.7 mm), while MMQA20VT3 uses SC−74 (3.0 × 1.5 mm). Layout redesign is required, yet net board area reduction exceeds 60%, and thermal coupling between channels is inherently managed within the monolithic die of MMQA20VT3.
Is MMQA20VT3 RoHS compliant and lead-free?
Yes, MMQA20VT3 is Pb-free and fully RoHS compliant per Directive 2011/65/EU, with matte tin lead finish and halogen-free molding compound. The "G" suffix in the part number explicitly denotes compliance, and solder reflow profiles follow J-STD-020D with peak temperature ≤260°C for 10 seconds - verified in ON Semiconductor's packaging specification BRD8011/D for MMQA20VT3.
MMQA20VT3 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):
- 15V (Max)
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 28.6V
- Current - Peak Pulse (10/1000µs):
- 840mA (8/20µs)
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
MMQA20VT3 FAQ
1.How can I place an order for MMQA20VT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA20VT3 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 MMQA20VT3 reliable?
The price and inventory of MMQA20VT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA20VT3 is usually 5 days.
3.What payment methods are accepted for MMQA20VT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA20VT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA20VT3?
MMQA20VT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA20VT3 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 MMQA20VT3?
For technical support, including MMQA20VT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA20VT3 requirements.
6.How does Aetrix verify that MMQA20VT3 is sourced from the original manufacturer or authorized distributors?
All MMQA20VT3 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 MMQA20VT3 meets industry standards.
7.What is the process for return or replacement of MMQA20VT3?
All MMQA20VT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMQA20VT3, 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 MMQA20VT3 part is unused and in its original packaging.
Return procedure for MMQA20VT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA20VT3 Tags
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onsemi
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Nexperia USA Inc.
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