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onsemi MMQA12VT1
- Part No.:
- MMQA12VT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA12VT1.pdf
- Description:
- TVS DIODE 9.1VWM 17.3VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
MMQA12VT1 from ON Semiconductor is a quad monolithic common-anode ESD protection diode designed for transient overvoltage suppression on four independent signal lines. It features a nominal Zener voltage of 12 V, maximum clamping voltage of 17.3 V at 1.39 A surge current, and ESD rating >16 kV per Human Body Model. It is used in compact I/O interfaces of printers, keyboards, and microprocessor buses where board space is constrained.
For engineers reviewing the MMQA12VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, SC−74 package footprint efficiency, low leakage (<75 nA), and compatibility with FR-5 PCB thermal constraints in high-density industrial and computing systems.
Technical Context
The MMQA12VT1 implements four independent unidirectional Zener clamp structures sharing a common anode (pins 2 and 5), enabling simultaneous protection of four signal lines with single-package integration. Its junction design supports peak pulse power dissipation of 24 W (1.0 ms) and 150 W (20 µs), with clamping validated per Figure 5 and Figure 6 waveforms.
Thermal performance is defined for two mounting conditions: 556 °C/W RJA on FR-5 board and 417 °C/W on alumina substrate. The device operates across −55 °C to +150 °C junction temperature range and is Pb-free, RoHS compliant, and AEC−Q101 qualified when ordered as SZMMQA variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 11.4–12.6 V @ 1.0 mA - defines precise clamping threshold for 12 V rail protection |
| Maximum Clamping Voltage (VRSM) | 17.3 V @ 1.39 A - ensures downstream ICs see no more than 17.3 V during 20 µs surge |
| Peak Pulse Power (1.0 ms) | 24 W - sustains short transients without failure on standard FR-5 PCB |
| Peak Pulse Power (20 µs) | 150 W - handles fast ESD events per IEC 61000-4-2 waveform |
| Reverse Leakage Current | <75 nA @ 9.1 V - minimizes standby power loss in battery-backed interfaces |
| ESD Rating (HBM) | >16 kV Class 3B - exceeds IEC 61000-4-2 Level 4 immunity requirements |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in extended-temperature industrial environments |
Pinout & Package
MMQA12VT1 uses the SC−74 (Case 318F) surface-mount package: 3.0 mm × 1.5 mm × 1.1 mm body, 6-pin leaded configuration, void-free thermosetting plastic case optimized for automated assembly and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Signal line input for first protected path; connects to I/O trace before clamp node |
| 2 | Common Anode | Shared return path for all four channels; must connect to system ground or reference rail |
| 3 | Cathode (Channel B) | Signal line input for second protected path; electrically isolated from Pin 1 |
| 4 | Cathode (Channel C) | Signal line input for third protected path; independent Zener junction |
| 5 | Common Anode | Redundant anode terminal for improved current sharing and thermal distribution |
| 6 | Cathode (Channel D) | Signal line input for fourth protected path; completes quad-channel layout |
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 tolerance | VRSM = 17.3 V max at 1.39 A - limits stress on 3.3 V/5 V logic inputs during ESD |
| High surge robustness | 150 W peak power @ 20 µs - withstands multiple IEC 61000-4-2 contact discharges |
| Ultra-low leakage | <75 nA @ 9.1 V - preserves signal integrity and battery life in always-on sensor interfaces |
| AEC−Q101 qualification readiness | SZMMQA variant available - meets automotive-grade reliability and PPAP requirements |
Applications
| Keyboard Interface Protection | Microprocessor Bus Protection |
|---|---|
Use Scenario: ESD-prone mechanical keyboard matrix with row/column scanning lines exposed to user contact. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between each key switch trace and MCU GPIO. Use Value: Prevents latch-up or gate oxide damage in MCU I/O pins during human-body discharges up to ±16 kV while occupying minimal board area. | Use Scenario: Address/data/control bus lines in embedded microprocessor systems interfacing with external peripherals. IC Role / Device Role / Timing Role: Line-level ESD clamp on parallel bus signals (e.g., AD0–AD7, ALE, RD#, WR#) referenced to common ground. Use Value: Maintains signal rise/fall times (capacitance <250 pF @ 0 V) while clamping surges to ≤17.3 V, ensuring reliable bus arbitration and data integrity. |
| Printer I/O Port Protection | Industrial Control Terminal Interface |
Use Scenario: RS-232/USB host-side I/O ports on multifunction printers subject to cable-induced transients and handling ESD. IC Role / Device Role / Timing Role: Per-line protection on TX, RX, DTR, RTS, and GND-referenced control signals. Use Value: Enables use of single MMQA12VT1 instead of four discrete TVS diodes - simplifies layout and reduces BOM count without sacrificing protection level. | Use Scenario: Front-panel pushbutton, LED, and serial debug interface on programmable logic controllers (PLCs) deployed in factory-floor environments. IC Role / Device Role / Timing Role: Input protection for 24 V DC-rated digital inputs and 3.3 V logic-level debug UART lines. Use Value: Supports dual-voltage domain protection (via appropriate channel pairing) while meeting IEC 61000-4-5 surge immunity requirements up to 1 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA12VT1G | AEC−Q101 qualified, PPAP-capable, identical electrical specs and SC−74 package | Required for automotive infotainment I/O protection; same pinout and layout | Select when automotive qualification, change control, or site-specific manufacturing traceability is mandated |
| TPD4E001DPYR | Quad unidirectional ESD array, 12 V VBR, 15 kV HBM, 3.5 pF per channel, SOT-23-6 package | Lower capacitance ideal for high-speed USB 2.0; not rated for 150 W 20 µs surges | Prefer for data-rate-sensitive interfaces; avoid where IEC 61000-4-2 Level 4 or high-energy surge immunity is required |
Compared with SZMMQA12VT1G, the MMQA12VT1 lacks automotive qualification but offers identical protection performance and footprint for industrial/commercial use; compared with TPD4E001DPYR, it delivers higher surge robustness at the cost of higher capacitance, making it better suited for robustness-critical rather than speed-critical lines.
Availability
MMQA12VT1 is available at Aetrix Electronics and suitable for industrial control terminals, printer I/O ports, keyboard interfaces, and microprocessor bus protection requiring stable component supply and long-term manufacturability.
Supply support for MMQA12VT1 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMQA series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for high-density, multi-line ESD protection in space-constrained computing and peripheral interfaces.
FAQ
What is the exact Zener voltage tolerance for MMQA12VT1?
The MMQA12VT1 has a guaranteed Zener voltage range of 11.4 V to 12.6 V at test current IZT = 1.0 mA, with nominal value 12 V. This 10% tolerance ensures predictable clamping onset across process and temperature variations, critical for protecting 12 V logic rails or bias networks without premature conduction.
Does MMQA12VT1 support bidirectional ESD protection?
No, MMQA12VT1 is strictly unidirectional. Its internal structure consists of four anode-connected Zener diodes, each conducting only when cathode voltage exceeds anode voltage by ≥11.4 V. For bidirectional protection, separate back-to-back configurations or dedicated bidirectional arrays like SMBJ12A would be required.
What is the thermal resistance of MMQA12VT1 on standard FR-5 PCB?
When mounted on a standard FR-5 board (1.0 × 0.75 × 0.62 in.), MMQA12VT1 exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W. This value governs steady-state power derating - for example, total power dissipation must be reduced to 1.8 mW/°C above 25 °C ambient to stay within safe operating limits.
Can MMQA12VT1 replace discrete 12 V Zener diodes in existing designs?
Yes, MMQA12VT1 can directly replace four discrete 12 V Zener diodes in common-anode configuration, provided the PCB layout accommodates its SC−74 6-pin footprint and the shared anode connections match the original grounding scheme. No circuit redesign is needed beyond footprint adaptation and verification of clamping voltage margin.
Is MMQA12VT1 compatible with lead-free reflow soldering processes?
Yes, MMQA12VT1 is Pb-free and RoHS compliant, rated for lead-free reflow with peak solder temperature up to 260 °C for 10 seconds. Its thermosetting plastic package and corrosion-resistant finish ensure reliability under J-STD-020-compliant profiles, including ramp rates and time-above-liquidus specifications.
MMQA12VT1 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):
- 9.1V (Max)
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 17.3V
- Current - Peak Pulse (10/1000µs):
- 1.39A (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
MMQA12VT1 FAQ
1.How can I place an order for MMQA12VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA12VT1 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 MMQA12VT1 reliable?
The price and inventory of MMQA12VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA12VT1 is usually 5 days.
3.What payment methods are accepted for MMQA12VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA12VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA12VT1?
MMQA12VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA12VT1 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 MMQA12VT1?
For technical support, including MMQA12VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA12VT1 requirements.
6.How does Aetrix verify that MMQA12VT1 is sourced from the original manufacturer or authorized distributors?
All MMQA12VT1 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 MMQA12VT1 meets industry standards.
7.What is the process for return or replacement of MMQA12VT1?
All MMQA12VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMQA12VT1, 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 MMQA12VT1 part is unused and in its original packaging.
Return procedure for MMQA12VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA12VT1 Tags
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