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onsemi MMQA20VT1
- Part No.:
- MMQA20VT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA20VT1.pdf
- Description:
- TVS DIODE 15VWM 28.6VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:8,169
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Product details
Overview
MMQA20VT1 from ON Semiconductor is a quad monolithic common-anode ESD protection diode in SC−74 package, rated for 20 V nominal Zener voltage (19–21 V range), 28.6 V clamping voltage at 20 A peak surge current, and 150 W peak power dissipation at 20 µs pulse. It protects four independent signal lines in space-constrained interfaces such as USB, keyboard, or microprocessor I/O buses.
For engineers reviewing the MMQA20VT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SC−74 terminal mapping, real-world clamping behavior under IEC 61000-4-2 stress, and direct alternatives with documented voltage and surge rating differences.
Technical Context
This device implements four unidirectional Zener clamping junctions sharing a common anode (Pin 2 and Pin 5), enabling simultaneous protection of four signal lines referenced to a shared ground or supply rail. Its design targets transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT), with guaranteed clamping below 28.6 V at 20 A and leakage <75 nA at 15 V reverse bias.
Thermal performance is defined for FR-5 board (RJA = 556 °C/W) and alumina substrate (RJA = 417 °C/W), supporting sustained operation from −55 °C to +150 °C. The SC−74 package supports automated placement and reflow soldering per JEDEC J-STD-020, with Pb-free compliance and 260 °C peak solder temperature rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 20 V (19–21 V range); sets primary clamping threshold for protected lines |
| Clamping Voltage @ 20 A | 28.6 V max; ensures downstream ICs see ≤28.6 V during 8/20 µs surge events |
| Peak Pulse Power | 150 W @ 20 µs (Figure 6 waveform); sustains high-energy transients without failure |
| Reverse Leakage Current | <75 nA @ 15 V; minimizes standby power loss and signal distortion in high-impedance nodes |
| ESD Rating (HBM) | Class 3B (>16 kV); exceeds IEC 61000-4-2 Level 4 (8 kV contact / 15 kV air) requirements |
| Junction Temperature Range | −55 °C to +150 °C; enables use in automotive under-hood and industrial control environments |
| Capacitance @ 0 V | 20.1 pF; low enough to avoid signal integrity degradation on USB 2.0 or UART lines |
Pinout & Package
SC−74 package (Case 318F, Style 1), 6-pin surface-mount, void-free thermosetting plastic body with corrosion-resistant 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 Zener clamp; connects to I/O trace |
| 2 | Common Anode (A1) | Shared anode node for Channels A, B, C, D; ties to GND or VCC |
| 3 | Cathode (Channel B) | Protected signal line input for second Zener clamp; independent from Pin 1 |
| 4 | Cathode (Channel C) | Protected signal line input for third Zener clamp; electrically isolated path |
| 5 | Common Anode (A2) | Second shared anode node; allows dual-rail configuration (e.g., GND + VCC) |
| 6 | Cathode (Channel D) | Protected signal line input for fourth Zener clamp; completes quad protection set |
Key Features
| Feature | Design Value |
|---|---|
| Quad common-anode architecture | Four independent unidirectional clamps in one SC−74 footprint-reduces PCB area by ~75% vs. discrete diodes |
| Low clamping voltage (28.6 V @ 20 A) | Protects 3.3 V/5 V logic rails without overvoltage damage during 8/20 µs surges |
| 16 kV+ HBM ESD rating | Eliminates need for external ESD test fixtures in production line handling of sensitive peripherals |
| 20.1 pF capacitance | Preserves signal rise/fall times on 480 Mbps USB 2.0 differential pairs without measurable jitter |
| Pb-free & RoHS-compliant | Meets EU Directive 2011/65/EU and J-STD-020 reflow profile for lead-free assembly |
Applications
| USB 2.0 Interface Protection | Industrial Keypad ESD Shielding |
|---|---|
Use Scenario: Protecting D+ and D− data lines, VBUS, and ID pins on embedded USB host ports against contact ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and PHY IC, with common anodes tied to system GND. Use Value: Clamps transients to ≤28.6 V within nanoseconds, preventing latch-up or gate oxide rupture in USB transceivers while adding only 20.1 pF loading per line. |
Use Scenario: Safeguarding matrix-scanned keypad rows/columns in factory HMIs exposed to operator finger discharge in dry environments. IC Role / Device Role / Timing Role: Quad-line ESD clamp mounted at connector entry point, with Pins 2 and 5 grounded to chassis GND. Use Value: Delivers Class 3B (≥16 kV) protection across all four scanned lines using single-component footprint-reducing BOM count and layout complexity. |
| Microprocessor I/O Bus Guarding | Printer Parallel Port Surge Suppression |
Use Scenario: Shielding address/data/control bus lines (e.g., GPIO, SPI, I²C) on ARM Cortex-M based controllers in medical devices. IC Role / Device Role / Timing Role: Common-anode TVS array connecting each I/O pin to local GND, leveraging low leakage (<75 nA) to avoid signal corruption. Use Value: Maintains bus signal integrity with sub-100 nA leakage at 15 V bias while surviving repeated 8 kV contact ESD strikes per IEC 61000-4-2. |
Use Scenario: Hardening Centronics-style parallel port pins (STROBE, ACK, BUSY, SELECT) against induced surges from nearby motor drives in office printers. IC Role / Device Role / Timing Role: Four-channel unidirectional suppressor with Pins 2 and 5 connected to printer GND plane, clamping each signal to ≤28.6 V. Use Value: Withstands 150 W peak pulse energy (20 µs), preventing false triggers or firmware lockups caused by 4 kV EFT bursts on legacy parallel interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA20VT1G | Automotive-grade variant (AEC-Q101 qualified); identical electrical specs but tighter process controls and PPAP documentation support | Required for automotive infotainment or ADAS sensor interfaces where qualification evidence is mandatory | Select SZMMQA20VT1G when automotive qualification or extended temperature validation is contractually required |
| MMQA22VT1G | 22 V nominal Zener (20.9–23.1 V range); 31.7 V clamping at 20 A; 10% higher standoff voltage | Better suited for 5 V systems with higher noise margins or 12 V auxiliary rails needing elevated clamping thresholds | Choose MMQA22VT1G if protected circuit operates above 20 V or requires higher VRWM to avoid leakage-induced power loss |
Compared with SZMMQA20VT1G, MMQA20VT1 offers identical clamping and leakage but lacks AEC-Q101 certification; versus MMQA22VT1G, it provides lower clamping (28.6 V vs. 31.7 V) for tighter protection of 3.3 V logic, at the cost of reduced maximum working voltage margin.
Availability
MMQA20VT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial keypad shielding, microprocessor I/O guarding, and printer parallel port surge suppression requiring stable component supply and consistent SC−74 packaging.
Supply support for MMQA20VT1 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MMQA/SZMMQA series is designed specifically for compact, multi-line ESD and surge protection in space-constrained consumer, computing, and industrial electronics-emphasizing low capacitance, precise clamping, and quad integration.
FAQ
What is the exact Zener voltage tolerance for MMQA20VT1?
The MMQA20VT1 has a specified breakdown voltage range of 19 V (minimum) to 21 V (maximum) at test current IZT = 1.0 mA, with nominal value 20 V. This ±5% tolerance ensures predictable clamping onset across production lots and temperature extremes from −55 °C to +150 °C, as confirmed in the Electrical Characteristics table on page 2 of the official datasheet.
Does MMQA20VT1 support bidirectional transient suppression?
No, MMQA20VT1 is strictly unidirectional. Its internal structure consists of four anode-connected Zener diodes, requiring the common anodes (Pins 2 and 5) to be tied to GND (for positive transients) or VCC (for negative transients). Bidirectional protection would require pairing with another device or selecting a dedicated bidirectional array like the NUP4201MR6T1G.
What is the maximum surge current MMQA20VT1 can handle without degradation?
MMQA20VT1 is rated for 20 A peak pulse current (IRSM) under the 8 × 20 µs waveform (Figure 6), corresponding to 150 W peak power. This rating is non-repetitive and assumes derating above 25 °C ambient per Figure 4. Sustained repetition requires thermal analysis using RJA = 556 °C/W (FR-5 board) to avoid junction overheating.
How does the dual common-anode configuration (Pins 2 and 5) function in MMQA20VT1?
Pins 2 and 5 are separate common anodes enabling flexible grounding schemes: Pin 2 serves Channels A (Pin 1) and B (Pin 3), while Pin 5 serves Channels C (Pin 4) and D (Pin 6). This allows independent routing-for example, tying Pin 2 to GND and Pin 5 to VCC to protect both positive and negative transients on mixed-signal lines without external components.
Is MMQA20VT1 compatible with lead-free reflow processes?
Yes, MMQA20VT1 is Pb-free and RoHS-compliant, qualified for standard lead-free reflow profiles with peak temperature up to 260 °C (10-second duration). Its SC−74 package meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1, eliminating bake requirements prior to assembly.
MMQA20VT1 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
MMQA20VT1 FAQ
1.How can I place an order for MMQA20VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA20VT1 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 MMQA20VT1 reliable?
The price and inventory of MMQA20VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA20VT1 is usually 5 days.
3.What payment methods are accepted for MMQA20VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA20VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA20VT1?
MMQA20VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA20VT1 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 MMQA20VT1?
For technical support, including MMQA20VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA20VT1 requirements.
6.How does Aetrix verify that MMQA20VT1 is sourced from the original manufacturer or authorized distributors?
All MMQA20VT1 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 MMQA20VT1 meets industry standards.
7.What is the process for return or replacement of MMQA20VT1?
All MMQA20VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMQA20VT1, 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 MMQA20VT1 part is unused and in its original packaging.
Return procedure for MMQA20VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA20VT1 Tags
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