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onsemi MMQA33VT1G
- Part No.:
- MMQA33VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA33VT1G.pdf
- Description:
- TVS DIODE 25VWM 48.6VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:73,499
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Product details
Overview
MMQA33VT1G from onsemi is a quad monolithic common-anode ESD protection diode designed for transient overvoltage suppression on four independent signal lines in space-constrained PCBs. It features a nominal Zener voltage of 33 V, maximum clamping voltage of 48.6 V at 200 A surge current, and ESD rating exceeding 16 kV per Human Body Model (HBM Class 3B). It is used in computer interfaces, microprocessor I/O protection, and communication port surge defense.
For engineers reviewing the MMQA33VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, SC-74 package footprint efficiency, thermal derating on FR-5 board, and compatibility with 3.3 V–5 V logic-level signal lines requiring robust ESD immunity.
Technical Context
This device implements a quad-junction common-anode configuration in a single SC-74 package, enabling simultaneous protection of four separate unidirectional signal paths referenced to a shared anode node (pins 2 and 5). Each cathode-anode pair operates as an independent Zener clamp with identical electrical characteristics across all four channels.
It delivers 24 W peak power dissipation (1.0 ms waveform) and 150 W peak power (8 × 20 µs waveform), with junction-to-ambient thermal resistance of 556 °C/W on FR-5 board. The device is rated for operation from −55 °C to +150 °C and is Pb-free, RoHS-compliant, and qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal (31.4–34.7 V range); defines precise clamping threshold for overvoltage events on protected lines. |
| Maximum Clamping Voltage (VRSM) | 48.6 V at 200 A peak surge current; ensures downstream ICs remain below absolute maximum ratings during transients. |
| Peak Pulse Power (1.0 ms) | 24 W per channel; supports robust protection against IEC 61000-4-5 Level 3 surges without thermal runaway. |
| Peak Pulse Power (8 × 20 µs) | 150 W per channel; handles fast-rising ESD and lightning-induced transients typical in USB, RS-232, and keypad interfaces. |
| Reverse Leakage Current | < 75 nA @ 25 °C; minimizes standby power loss and avoids signal integrity degradation on high-impedance nodes. |
| ESD Rating (HBM) | Class 3B (> 16 kV); exceeds IEC 61000-4-2 Level 4 requirements for user-accessible ports. |
| Junction Temperature Range | −55 °C to +150 °C; enables deployment in industrial control, automotive under-hood, and medical equipment environments. |
Pinout & Package
MMQA33VT1G is housed in an SC-74 (Case 318F) surface-mount package - a compact 6-pin leaded plastic package measuring 2.2 mm × 2.2 mm × 1.0 mm, optimized for automated assembly and high-density routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected signal line input for first unidirectional clamp path; connects to I/O trace before connector or interface IC. |
| Pin 2 | Anode (Common) | Shared anode node for all four channels; must be connected to system ground or local reference plane with low-inductance path. |
| Pin 3 | Cathode (Channel B) | Protected signal line input for second clamp path; electrically isolated from Pin 1 but shares same VZ and clamping behavior. |
| Pin 4 | Cathode (Channel C) | Protected signal line input for third clamp path; enables three-line protection in parallel with minimal layout overhead. |
| Pin 5 | Anode (Common) | Redundant anode connection for improved current sharing and lower parasitic inductance; tied internally to Pin 2. |
| Pin 6 | Cathode (Channel D) | Protected signal line input for fourth clamp path; completes full quad-line coverage in one footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent unidirectional clamps share two anode pins (2 & 5), reducing PCB real estate by ~75% vs. discrete diodes. |
| Low Capacitance (37 pF) | Minimizes signal distortion and timing skew on high-speed lines such as USB 2.0, HDMI DDC, or SPI clock/data pairs. |
| High Surge Current Handling (200 A) | Withstands repetitive ESD strikes and short-duration surges without parameter shift or catastrophic failure. |
| Pb-Free & RoHS-Compliant Construction | Meets global environmental compliance mandates and supports lead-free reflow profiles up to 260 °C peak solder temperature. |
| AEC-Q101 Qualified | Validated for automotive applications including infotainment I/O, body control module interfaces, and sensor signal conditioning. |
Applications
| USB 2.0 Port Protection | Industrial Keypad Interface |
|---|---|
Use Scenario: Protecting D+ and D− data lines, VBUS, and ID pins of embedded USB host/device connectors against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed directly at connector entry point, clamping transients before they reach USB transceiver or controller. Use Value: Maintains signal integrity with only 37 pF capacitance while delivering 48.6 V clamping at 200 A-ensuring USB eye diagram compliance and pass/fail repeatability in IEC 61000-4-2 testing. |
Use Scenario: Shielding matrix-scanned keypad rows/columns in factory HMIs, medical panels, or building automation terminals from operator ESD. IC Role / Device Role / Timing Role: Four-channel clamp isolating each key scan line from shared ground return, preventing false keypresses or microcontroller reset during discharge. Use Value: Eliminates need for four discrete SOD-323 diodes; reduces BOM count, placement cost, and routing congestion while maintaining sub-75 nA leakage for accurate analog scanning. |
| Microprocessor I/O Bus Protection | RS-232/RS-485 Transceiver Interface |
Use Scenario: Safeguarding address/data/control bus lines (e.g., GPIO, UART, SPI) of ARM Cortex-M or RISC-V SoCs in edge computing modules. IC Role / Device Role / Timing Role: Localized clamping element placed adjacent to processor pins, limiting voltage excursion during hot-plug or EMI coupling events. Use Value: 33 V Zener voltage aligns with 3.3 V/5 V I/O rail margins; 24 W 1-ms pulse rating prevents latch-up in CMOS inputs during sustained transients. |
Use Scenario: Protecting differential driver/receiver pins of RS-232 line drivers (e.g., MAX3232) or RS-485 transceivers (e.g., SN65HVD72) in industrial PLC backplanes. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional clamp (anode grounded) applied to TX/RX lines and enable pins to absorb ±15 kV HBM discharges. Use Value: 150 W 8×20 µs rating handles fast-rising transients from long cable runs; common-anode topology simplifies grounding to transceiver GND plane. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA33VT1G | Identical electrical specs and pinout; includes AEC-Q101 qualification documentation and PPAP support for automotive programs. | Required for Tier-1 automotive designs where process traceability and change control are mandated. | Select SZMMQA33VT1G when automotive PPAP submission, site-specific manufacturing controls, or enhanced lot traceability are required. |
| MMQA33WT1G | Same SC-74 package and quad common-anode structure, but rated for 36 V nominal Zener voltage (34.2–37.8 V range) and higher 53.5 V clamping at 200 A. | Better suited for 5 V systems with wider supply tolerance or where margin above 33 V rail is needed for long-term aging. | Choose MMQA33WT1G if system VCC exceeds 3.6 V or if design requires >3 V headroom above nominal rail during worst-case surge. |
Compared with MMQA33VT1G, SZMMQA33VT1G adds automotive-grade documentation rigor without altering electrical behavior, while MMQA33WT1G provides higher clamping margin at the cost of reduced precision near 33 V threshold-making MMQA33VT1G optimal for tightly regulated 3.3 V I/O protection with minimal overshoot risk.
Availability
MMQA33VT1G is available at Aetrix Electronics and suitable for industrial HMI interfaces, embedded USB peripheral protection, and microprocessor I/O bus safeguarding requiring stable component supply and long-term lifecycle assurance.
Supply support for MMQA33VT1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMQA series belongs to onsemi's ESD and transient voltage suppression product line, engineered specifically for high-density, multi-line signal protection in portable and space-constrained electronics.
FAQ
What is the exact Zener voltage tolerance of MMQA33VT1G?
The MMQA33VT1G has a guaranteed breakdown voltage range of 31.4 V (minimum) to 34.7 V (maximum) at test current IZT = 1.0 mA, with 33 V as the nominal value. This ±5% tolerance ensures predictable clamping onset across temperature and production lots, critical for protecting 3.3 V logic rails without premature conduction.
Can MMQA33VT1G be used for bidirectional signal lines like USB D+/D−?
MMQA33VT1G is configured as a unidirectional clamp with common anode; it protects signals referenced to ground but does not inherently support true bidirectional clamping. For USB D+/D−, it must be used in conjunction with a second device or complementary TVS array-MMQA33VT1G alone clamps only positive transients toward ground.
What is the thermal resistance of MMQA33VT1G on standard FR-5 PCB?
MMQA33VT1G exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on a standard FR-5 board (1.0 × 0.75 × 0.62 in.), with total power dissipation derated linearly above 25 °C at 1.8 mW/°C. This value informs safe operating area calculations during repetitive surge events.
Does MMQA33VT1G meet automotive qualification standards?
MMQA33VT1G itself is not AEC-Q101 qualified; however, its automotive-grade variant SZMMQA33VT1G carries full AEC-Q101 qualification and PPAP capability. MMQA33VT1G is suitable for industrial and commercial applications, while SZMMQA33VT1G is required for automotive ECUs and infotainment systems.
How does the SC-74 package of MMQA33VT1G compare to SOT-23 or SOIC in layout density?
The SC-74 package measures just 2.2 mm × 2.2 mm, offering ~40% smaller footprint than standard SOT-23 and ~85% less area than SOIC-8. Its 6-pin leaded configuration allows direct replacement of four discrete SOD-323 diodes-reducing pad count, stencil complexity, and routing congestion in high-pin-count microcontroller interfaces.
MMQA33VT1G 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):
- 25V (Max)
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 48.6V
- Current - Peak Pulse (10/1000µs):
- 504mA (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
MMQA33VT1G FAQ
1.How can I place an order for MMQA33VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA33VT1G 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 MMQA33VT1G reliable?
The price and inventory of MMQA33VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA33VT1G is usually 5 days.
3.What payment methods are accepted for MMQA33VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA33VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA33VT1G?
MMQA33VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA33VT1G 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 MMQA33VT1G?
For technical support, including MMQA33VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA33VT1G requirements.
6.How does Aetrix verify that MMQA33VT1G is sourced from the original manufacturer or authorized distributors?
All MMQA33VT1G 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 MMQA33VT1G meets industry standards.
7.What is the process for return or replacement of MMQA33VT1G?
All MMQA33VT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMQA33VT1G, 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 MMQA33VT1G part is unused and in its original packaging.
Return procedure for MMQA33VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA33VT1G Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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ESD5Z3.3T1G
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D5V0H1B2LP-7B
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DESD5V0U1BA-7
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ESD5Z5.0T1G
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DESD5V0U1BB-7
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
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