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onsemi MMQA20VT3G
- Part No.:
- MMQA20VT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA20VT3G.pdf
- Description:
- TVS DIODE 15VWM 28.6VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:8,360
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Product details
Overview
MMQA20VT3G 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 I/O lines simultaneously in space-constrained interfaces such as USB, keyboard, or microprocessor data buses.
For engineers reviewing the MMQA20VT3G datasheet, pinout, applications, or equivalent options, key selection considerations include unidirectional clamping performance, Class 3B ESD rating (>16 kV HBM), low leakage (<75 nA), and SC−74 footprint compatibility with high-density PCB layouts.
Technical Context
The MMQA20VT3G implements a quad-junction common-anode silicon structure enabling independent transient suppression on four signal lines using shared anode connections (Pins 2 and 5). Each cathode–anode path operates as a unidirectional Zener clamp with specified breakdown at 19–21 V and dynamic impedance ≤80 Ω.
It is characterized per JEDEC standards for non-repetitive surge waveforms: 10/1000 µs (24 W) and 8/20 µs (150 W), with thermal resistance of 556 °C/W on FR-5 board. The device meets AEC−Q101 requirements and is Pb-free/RoHS compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 20 V - defines primary clamping threshold for overvoltage protection on each protected line |
| Clamping Voltage @ 1.0 A | 28.6 V - maximum voltage seen by protected circuit during 8/20 µs surge event |
| Peak Pulse Power (8/20 µs) | 150 W - determines survivability against fast, high-energy transients like EFT or lightning-induced surges |
| Reverse Leakage Current | <75 nA @ 15 V - ensures minimal signal loading and power loss in standby or low-power modes |
| ESD Rating (HBM) | Class 3B (>16 kV) - qualifies for direct interface protection in user-accessible ports without external shielding |
| Thermal Resistance RJA | 556 °C/W - sets derating limit to 225 mW continuous power on standard FR-5 PCB |
| Capacitance @ 0 V, 1 MHz | 20.1 pF - maintains signal integrity for data rates up to ~300 Mbps in USB 2.0 or UART applications |
Pinout & Package
SC−74 package (Case 318F−05), surface-mount, 6-pin, void-free thermosetting plastic body with corrosion-resistant solderable finish. Dimensions: 3.0 × 1.5 × 1.0 mm (L × W × H), 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected signal line input for first unidirectional clamp path (anode shared at Pin 2) |
| 2 | Common Anode (A/B/C/D) | Shared anode connection for all four channels; ties to system ground or reference rail |
| 3 | Cathode (Channel B) | Protected signal line input for second clamp path (anode shared at Pin 2) |
| 4 | Cathode (Channel C) | Protected signal line input for third clamp path (anode shared at Pin 5) |
| 5 | Common Anode (A/B/C/D) | Second shared anode node-enables dual-anode layout flexibility and current splitting |
| 6 | Cathode (Channel D) | Protected signal line input for fourth clamp path (anode shared at Pin 5) |
Key Features
| Feature | Design Value |
|---|---|
| Quad common-anode architecture | Enables four-line protection in single 3.0 × 1.5 mm footprint-reduces board area vs. discrete diodes by >70% |
| 150 W peak pulse rating (8/20 µs) | Supports IEC 61000-4-5 Level 3 surge immunity (1 kV line-to-ground) without external series impedance |
| 20.1 pF capacitance @ 0 V | Preserves rise time <1 ns for signals up to 350 Mbps; suitable for USB 2.0, SPI, and parallel bus interfaces |
| Class 3B ESD rating (>16 kV HBM) | Eliminates need for secondary ESD staging in consumer-grade peripheral ports and human-interface circuits |
| AEC−Q101 qualified | Validated for automotive infotainment and body electronics where temperature cycling and vibration reliability are required |
Applications
| USB 2.0 Port Protection | Keyboard/Mouse Interface |
|---|---|
|
Use Scenario: Protecting D+ and D− data lines, VBUS, and ID pins of upstream/downstream USB connectors against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed directly at connector entry point, with common anodes tied to chassis or digital ground. Use Value: Prevents latch-up or damage to USB transceivers while maintaining <1 ns signal delay and <20 pF loading-critical for full-speed 480 Mbps compliance. |
Use Scenario: Safeguarding matrix scan lines and interrupt inputs of PC keyboard/mouse controllers exposed to user handling and static discharge. IC Role / Device Role / Timing Role: Quad-channel ESD clamp isolating row/column I/O lines from MCU GPIOs, with shared anodes routed to clean ground plane. Use Value: Achieves >16 kV HBM protection across all four lines using one component-reducing BOM count and eliminating routing congestion in compact HID PCBs. |
| Microprocessor Data Bus | Industrial Serial Interface |
|
Use Scenario: Shielding address/data/control bus lines (e.g., AD0–AD7, RD#, WR#) of 8-bit microcontrollers in medical or test equipment. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp placed adjacent to MCU pins to shunt transients before propagation into core logic. Use Value: Limits clamping voltage to 28.6 V under 1 A surge-keeping bus voltages within safe margin below 30 V absolute maximum ratings. |
Use Scenario: Hardening RS-485 or CAN physical layer lines (A/B) and associated control signals (DE, RE) in factory automation nodes. IC Role / Device Role / Timing Role: Dual-anode configuration allows separate grounding of data pair and control lines while sharing suppression elements. Use Value: Delivers 150 W surge handling per line without derating-meeting IEC 61000-4-4 EFT immunity requirements for industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA20VT3G | Automotive-grade variant with PPAP documentation, identical electrical specs and SC−74 package | Required for AEC−Q101-compliant automotive modules; same pinout and layout | Select SZMMQA20VT3G when automotive qualification, change control, or site-specific traceability is mandated |
| MMQA20VT1G | Identical electrical and mechanical specs; differs only in tape-and-reel packaging (3,000 vs. 10,000 units/reel) | No functional difference-used interchangeably where volume procurement or reel size drives logistics | Choose MMQA20VT1G for prototyping, low-volume builds, or when smaller reels align with SMT line setup cycles |
Compared with SZMMQA20VT3G and MMQA20VT1G, the MMQA20VT3G offers identical protection performance and SC−74 footprint but targets high-volume industrial production with 10,000-unit tape-and-reel delivery-optimizing pick-and-place efficiency and reducing line changeovers.
Availability
MMQA20VT3G is available at Aetrix Electronics and suitable for USB interface protection, keyboard/mouse I/O hardening, and microprocessor bus safeguarding requiring stable component supply and long-term manufacturability.
Supply support for MMQA20VT3G 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, sensor, and ESD protection solutions for automotive, industrial, and computing markets.
The MMQA20VT3G belongs to the MMQA/SZMMQA Quad Common Anode Series-designed specifically to deliver multi-line transient suppression in ultra-compact SC−74 packages for space-constrained digital interfaces.
FAQ
What is the clamping voltage of MMQA20VT3G at 1.0 A peak pulse current?
The MMQA20VT3G has a maximum clamping voltage of 28.6 V at 1.0 A peak pulse current under the 8/20 µs waveform condition. This value is measured per Figure 6 in the datasheet and represents the upper voltage limit imposed on protected lines during surge events, ensuring downstream ICs remain within safe operating margins.
How many independent protection channels does MMQA20VT3G provide?
The MMQA20VT3G provides four independent unidirectional protection channels in a single SC−74 package. Pins 1, 3, 4, and 6 serve as individual cathodes, while Pins 2 and 5 function as dual common anodes-allowing flexible routing of up to four signal lines to shared ground references.
Is MMQA20VT3G suitable for automotive applications?
The MMQA20VT3G itself is not AEC−Q101 qualified; however, its automotive-grade counterpart SZMMQA20VT3G shares identical electrical and mechanical specifications and is fully qualified. For automotive use, designers must specify SZMMQA20VT3G to meet PPAP and change-control requirements.
What is the maximum continuous power dissipation of MMQA20VT3G on FR-5 board?
The MMQA20VT3G has a total power dissipation rating of 225 mW on FR-5 board at TA = 25°C, with thermal resistance RJA = 556 °C/W. Derating begins above 25°C at 1.8 mW/°C, limiting usable continuous power to ~135 mW at 85°C ambient.
Does MMQA20VT3G support bidirectional transient suppression?
No, MMQA20VT3G is strictly unidirectional. Its internal structure consists of four Zener diodes oriented cathode-to-anode, enabling clamping only when cathode voltage exceeds anode voltage. For bidirectional protection, separate devices such as PTVSxP1UP series or dual-diode configurations are required.
MMQA20VT3G 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
MMQA20VT3G FAQ
1.How can I place an order for MMQA20VT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA20VT3G 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 MMQA20VT3G reliable?
The price and inventory of MMQA20VT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA20VT3G is usually 5 days.
3.What payment methods are accepted for MMQA20VT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA20VT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA20VT3G?
MMQA20VT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA20VT3G 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 MMQA20VT3G?
For technical support, including MMQA20VT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA20VT3G requirements.
6.How does Aetrix verify that MMQA20VT3G is sourced from the original manufacturer or authorized distributors?
All MMQA20VT3G 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 MMQA20VT3G meets industry standards.
7.What is the process for return or replacement of MMQA20VT3G?
All MMQA20VT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMQA20VT3G, 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 MMQA20VT3G part is unused and in its original packaging.
Return procedure for MMQA20VT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA20VT3G Tags
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ESD9B5.0ST5G
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