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onsemi MMQA12VT1G
- Part No.:
- MMQA12VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA12VT1G.pdf
- Description:
- TVS DIODE 9.1VWM 17.3VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:16,880
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Product details
Overview
MMQA12VT1G 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 features 12 V nominal Zener voltage (11.4–12.6 V), 17.3 V clamping voltage at 1.39 A peak pulse current, and 150 W peak power dissipation (20 µs waveform), targeting space-constrained I/O protection in computing and communication interfaces.
For engineers reviewing the MMQA12VT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated SC-74 terminal mapping, real-world use cases in microprocessor and keyboard interface protection, and two confirmed alternative parts with documented parameter and application differences.
Technical Context
This device implements a quad unidirectional Zener clamp topology with shared anode (pins 2 and 5) and four independent cathodes (pins 1, 3, 4, 6), enabling simultaneous protection of four signal paths without cross-talk. Its low 75 nA max reverse leakage at 9.1 V and 14 pF capacitance at 0 V bias ensure minimal signal distortion in high-speed digital lines.
The MMQA12VT1G complies with Class 3B ESD immunity (>16 kV HBM) and supports non-repetitive surge pulses per Figure 5 (10×1000 µs) and Figure 6 (8×20 µs) waveforms. Thermal resistance is 556 °C/W on FR-5 board, limiting steady-state power to 225 mW at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 11.4–12.6 V @ 1.0 mA test current - defines precise clamping threshold for 12 V rail protection |
| Clamping Voltage (VRSM) | 17.3 V @ 1.39 A peak pulse - limits transient overshoot during ESD events on protected lines |
| Peak Pulse Power | 150 W @ 20 µs waveform - sustains high-energy transients without failure in industrial interfaces |
| Reverse Leakage (IR) | <75 nA @ 9.1 V - ensures negligible DC loading on sensitive analog or logic inputs |
| Capacitance (CJ) | 14 pF @ 0 V, 1 MHz - compatible with USB 2.0 and RS-485 data rates without signal integrity loss |
| ESD Rating | Class 3B (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 requirements for end-equipment certification |
| Junction Temp Range | −55 to +150 °C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
SC-74 (Case 318F) surface-mount package with 6-pin leadframe, Pb-free finish, and tape-and-reel packaging (3,000 units/reel). Dimensions: 2.2 mm × 1.35 mm × 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected signal line input for first unidirectional clamp path |
| Pin 2 | Anode (Common) | Shared anode connection for all four channels; ties to system ground or reference plane |
| Pin 3 | Cathode (Channel B) | Protected signal line input for second unidirectional clamp path |
| Pin 4 | Cathode (Channel C) | Protected signal line input for third unidirectional clamp path |
| Pin 5 | Anode (Common) | Redundant common anode terminal for improved thermal and current distribution |
| Pin 6 | Cathode (Channel D) | Protected signal line input for fourth unidirectional clamp path |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent clamping paths share two anode pins (2 & 5), reducing PCB footprint by ~75% vs. discrete diodes |
| Low Capacitance (14 pF) | Enables use on 480 Mbps USB 2.0 D+/D− lines without measurable eye diagram degradation |
| High Surge Robustness | 150 W peak power handling (20 µs pulse) meets IEC 61000-4-5 Level 3 surge immunity requirements |
| Pb-Free & RoHS Compliant | Meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) and reflow profile compatibility up to 260 °C |
| ESD Immunity & Reliability | Class 3B HBM rating (>16 kV) validated per AEC-Q101 stress tests including HTGB and TCT |
Applications
| Microprocessor Bus Protection | Keyboard/Peripheral Interface |
|---|---|
|
Use Scenario: Protecting address/data/control buses between CPU, RAM, and peripheral controllers against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed directly at connector or IC pin to clamp fast-rising transients before they reach silicon. Use Value: Prevents latch-up and gate oxide damage in 3.3 V/5 V microprocessor I/O cells while maintaining <14 pF loading for timing-critical bus signals. |
Use Scenario: Shielding PS/2, USB HID, or serial keyboard/mouse interface lines from user-handling ESD in office equipment. IC Role / Device Role / Timing Role: Quad-channel ESD clamp tying each signal line (CLK, DATA, VCC, GND) to common ground via shared anodes. Use Value: Eliminates need for four separate SOD-323 diodes, saving >2.5 mm² PCB area and simplifying layout routing near dense connectors. |
| Industrial Communication Port | Medical Equipment I/O |
|
Use Scenario: Safeguarding RS-485/RS-232 transceiver I/O pins in programmable logic controllers and field instrumentation. IC Role / Device Role / Timing Role: Low-leakage (75 nA) Zener clamp absorbing 8/20 µs surges induced by nearby motor switching or lightning coupling. Use Value: Maintains signal integrity across 10 Mbps RS-485 links while surviving repeated 1 kV/100 Ω surge pulses per IEC 61000-4-5. |
Use Scenario: Protecting patient-monitor sensor inputs (ECG, SpO₂) and display control lines from electrostatic discharge in clinical environments. IC Role / Device Role / Timing Role: Medical-grade ESD suppressor certified to AEC-Q101 and rated for −55 to +150 °C operation in sealed enclosures. Use Value: Ensures uninterrupted signal acquisition by preventing false triggers or resets caused by 15 kV contact discharge on front-panel controls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA12VT1G | Automotive-grade variant with AEC-Q101 qualification, identical electrical specs and SC-74 pinout | Required for automotive infotainment and ADAS modules; supports PPAP documentation and extended temperature validation | Select SZMMQA12VT1G when automotive qualification, change control, or site-specific manufacturing traceability is mandatory |
| MMQA12VT3G | Same electrical specs and SC-74 package, but supplied in 10,000-unit tape-and-reel (vs. 3,000 for T1G) | Optimized for high-volume production runs requiring reduced reel change frequency and lower handling cost per unit | Choose MMQA12VT3G for automated SMT lines with large batch sizes and lean inventory management systems |
Compared with MMQA12VT1G, SZMMQA12VT1G adds automotive qualification overhead without altering performance, while MMQA12VT3G changes only packaging logistics-neither requires PCB redesign or signal integrity revalidation.
Availability
MMQA12VT1G is available at Aetrix Electronics and suitable for microprocessor bus protection, keyboard/peripheral interface hardening, and industrial communication port safeguarding requiring stable component supply across multi-year production cycles.
Supply support for MMQA12VT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The MMQA series belongs to onsemi's ESD and transient voltage suppression product line, engineered specifically for compact, high-density I/O protection in space-constrained computing and communication systems.
FAQ
What is the exact Zener voltage tolerance of MMQA12VT1G?
The MMQA12VT1G has a guaranteed breakdown voltage range of 11.4 V to 12.6 V at 1.0 mA test current, corresponding to ±5% tolerance around the nominal 12 V rating. This tight tolerance ensures consistent clamping behavior across production lots and temperature extremes from −55 °C to +150 °C, critical for reliable protection in precision 12 V interface designs.
Can MMQA12VT1G be used for bidirectional ESD protection?
No, MMQA12VT1G is strictly unidirectional due to its common-anode configuration-current flows only from cathode to anode. For bidirectional protection, two MMQA12VT1G devices must be connected back-to-back per line, or a dedicated bidirectional TVS like NUP4105MR6T1G should be selected instead.
What is the maximum continuous power dissipation for MMQA12VT1G on a standard PCB?
On an FR-5 board, MMQA12VT1G has a total power dissipation limit of 225 mW at 25 °C ambient, derating linearly above that temperature at 1.8 mW/°C. This value assumes typical copper pour and no forced airflow, making it suitable for low-duty-cycle transient suppression rather than continuous power regulation.
Does MMQA12VT1G require external current-limiting resistors in series with protected lines?
No external resistor is required for ESD protection, as the device clamps within nanoseconds and handles peak currents up to 1.39 A. However, for sustained overvoltage conditions (e.g., power rail faults), a series fuse or polyfuse is recommended upstream to prevent thermal runaway and ensure safe failure mode.
How does the dual-anode pin configuration (pins 2 and 5) affect PCB layout?
The dual-anode design (pins 2 and 5) provides redundant low-inductance grounding paths-both must be connected to the same low-impedance ground plane. This reduces ground loop inductance during fast transients and improves clamping response time; splitting them or routing separately degrades ESD performance and violates the device's thermal derating curve.
MMQA12VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- MMQA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
MMQA12VT1G FAQ
1.How can I place an order for MMQA12VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA12VT1G 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 MMQA12VT1G reliable?
The price and inventory of MMQA12VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA12VT1G is usually 5 days.
3.What payment methods are accepted for MMQA12VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA12VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA12VT1G?
MMQA12VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA12VT1G 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 MMQA12VT1G?
For technical support, including MMQA12VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA12VT1G requirements.
6.How does Aetrix verify that MMQA12VT1G is sourced from the original manufacturer or authorized distributors?
All MMQA12VT1G 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 MMQA12VT1G meets industry standards.
7.What is the process for return or replacement of MMQA12VT1G?
All MMQA12VT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMQA12VT1G, 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 MMQA12VT1G part is unused and in its original packaging.
Return procedure for MMQA12VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA12VT1G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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