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onsemi SZMMQA12VT1G
- Part No.:
- SZMMQA12VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZMMQA12VT1G.pdf
- Description:
- ESD PROTECTOR, COMMON ANODE, SC-
- Quantity:
- Payment:
- Shipping:
Inventory:8,498
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Product details
Overview
SZMMQA12VT1G 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 breakdown voltage (11.4–12.6 V), ≤75 nA reverse leakage at 9.1 V, 17.3 V clamping voltage at 1.39 A surge current, and 24 W peak power rating (1.0 ms waveform). It is widely used in I/O line protection for microprocessor-based systems where board space is constrained.
For engineers reviewing the SZMMQA12VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, low capacitance (not specified for this variant but ≤250 pF in family), AEC-Q101 qualification, SC-74 footprint compatibility, and multi-line common-anode topology for compact PCB layout.
Technical Context
This device implements four independent unidirectional Zener-type ESD clamps sharing a common anode connection across pins 2 and 5. Each cathode-anode path operates as a standalone transient voltage suppressor with defined breakdown and clamping characteristics under standardized 10/1000 µs and 8/20 µs surge waveforms.
Thermal design relies on FR-5 board derating (225 mW at 25°C, 556 °C/W RJA) or alumina substrate (300 mW, 417 °C/W), supporting operation from −55°C to +150°C. The SC-74 package enables high-density placement while maintaining isolation between protected lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZT) | 11.4–12.6 V at 1.0 mA test current - defines minimum trigger threshold for transient clamping |
| Clamping Voltage (VRSM) | 17.3 V at 1.39 A peak pulse - maximum voltage seen by protected circuit during 8/20 µs surge |
| Peak Pulse Power | 24 W @ 1.0 ms (Figure 5); 150 W @ 20 µs (Figure 6) - determines survivability against short-duration transients |
| Reverse Leakage Current | ≤75 nA @ 9.1 V - ensures minimal signal loading and power loss in standby state |
| ESD Rating | Class 3B (>16 kV HBM) - meets IEC 61000-4-2 Level 4 immunity requirements for system-level ESD protection |
| Junction Temperature Range | −55°C to +150°C - supports automotive under-hood and industrial ambient environments |
| AEC-Q101 Qualified | Yes - validated for automotive electronics applications requiring reliability under temperature cycling, humidity, and mechanical stress |
Pinout & Package
SC-74 package (Case 318F, Style 1), surface-mount, Pb-free, 6-pin small-outline transistor outline with 0.95 mm pitch. Dimensions per onsemi document 98ASB42973B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected line input for first unidirectional clamp path |
| 2 | Anode (Common) | Shared anode node for all four channels; connects to ground or reference rail |
| 3 | Cathode (Channel B) | Protected line input for second unidirectional clamp path |
| 4 | Cathode (Channel C) | Protected line input for third unidirectional clamp path |
| 5 | Anode (Common) | Redundant common anode terminal; improves thermal and current-handling capability |
| 6 | Cathode (Channel D) | Protected line input for fourth unidirectional clamp path |
Key Features
| Feature | Design Value |
|---|---|
| Quad common-anode architecture | Enables four independent signal-line protections in one SC-74 footprint, reducing PCB area by ~75% vs. discrete diodes |
| Low clamping voltage (17.3 V) | Ensures downstream ICs rated for 18–24 V logic rails remain within safe operating limits during ESD events |
| AEC-Q101 qualification | Validates robustness for automotive infotainment, body control, and ADAS interface protection without additional qualification effort |
| 16 kV+ HBM ESD rating | Exceeds IEC 61000-4-2 Level 4 requirement, eliminating need for secondary ESD staging in many consumer and industrial designs |
| Pb-free and RoHS-compliant | Meets global environmental compliance mandates and supports lead-free reflow soldering profiles up to 260°C |
Applications
| Microprocessor I/O Protection | Keyboard/Peripheral Interface |
|---|---|
Use Scenario: Protecting address/data/control bus lines of embedded microcontrollers against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between each I/O pin and ground, leveraging common-anode topology to minimize component count. Use Value: Prevents latch-up or permanent damage to MCU GPIOs during handling or system integration, enabling reliable field deployment without redesign. |
Use Scenario: Safeguarding USB, PS/2, or serial interface lines in keyboards, mice, and point-of-sale terminals. IC Role / Device Role / Timing Role: ESD clamp on each signal line (D+, D−, VBUS, ID) with shared ground return via dual anode pins. Use Value: Maintains signal integrity below 100 pF typical capacitance (family data), avoiding timing skew or USB 2.0 high-speed compliance issues. |
| Printer Communication Port | Medical Equipment Data Link |
Use Scenario: Shielding parallel or RS-232/RS-485 ports in office printers and multifunction devices from electrostatic discharge during paper jams or user interaction. IC Role / Device Role / Timing Role: Four-channel line protector covering STROBE, ACK, BUSY, and ERROR signals in parallel interfaces or TX/RX/RTS/CTS in serial links. Use Value: Eliminates intermittent communication failures caused by ESD-induced bit errors, improving mean time between service calls. |
Use Scenario: Securing patient-monitoring data buses (e.g., SPI, I²C) connecting sensors to central units in diagnostic equipment. IC Role / Device Role / Timing Role: Low-leakage (≤75 nA) clamping diode ensuring no DC loading on sensitive analog sensor outputs or digital control lines. Use Value: Preserves measurement accuracy and avoids false alarms triggered by transient-induced logic glitches in life-critical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA12VT3G | Same electrical specs and SC-74 package; supplied in 10,000-unit tape-and-reel vs. 3,000-unit for SZMMQA12VT1G | No functional difference; optimized for high-volume automated assembly | Select SZMMQA12VT3G when production volume exceeds 50k units/year and reel changeover efficiency is critical |
| ESD5V3U2MUTAG | Single-channel, SOT-23 package; 5.3 V working voltage; lower clamping (12.5 V @ 1 A); higher capacitance (120 pF typical) | Requires four separate placements; less board-area efficient but offers tighter voltage tolerance for 5 V logic rails | Choose ESD5V3U2MUTAG only when protecting 3.3–5 V interfaces where 12 V clamping would exceed safe margin |
Compared with SZMMQA12VT1G, SZMMQA12VT3G offers identical protection performance with larger reel packaging for manufacturing scale, while ESD5V3U2MUTAG trades integration density for lower clamping voltage and higher capacitance-making it suitable only for lower-voltage, single-line applications where board space is not constrained.
Availability
SZMMQA12VT1G is available at Aetrix Electronics and suitable for microprocessor I/O protection, peripheral interface hardening, printer port shielding, and medical data-link safeguarding requiring stable component supply across extended product lifecycles.
Supply support for SZMMQA12VT1G 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.
SZMMQA12VT1G belongs to the MMQA/SZMMQA Quad Common Anode Series, engineered specifically for compact, multi-line ESD and transient voltage protection in space-constrained electronic systems.
FAQ
What is the primary function of the SZMMQA12VT1G?
The SZMMQA12VT1G is a quad unidirectional ESD protection diode with common-anode configuration, designed to clamp transient overvoltages on four independent signal lines. Its core function is to shunt ESD and surge currents to ground before they damage sensitive downstream ICs. Each channel has a 12 V nominal breakdown voltage and clamps to 17.3 V at 1.39 A, making SZMMQA12VT1G ideal for protecting microcontroller I/O, USB, and serial interfaces in compact layouts.
Is the SZMMQA12VT1G suitable for automotive applications?
Yes, the SZMMQA12VT1G is AEC-Q101 qualified and carries the "SZ" prefix indicating automotive-grade screening and PPAP capability. It operates reliably from −55°C to +150°C and withstands mechanical and thermal stresses required for under-dash, infotainment, and body-control module applications. Engineers specifying SZMMQA12VT1G for automotive designs benefit from pre-validated reliability without additional qualification testing.
How does the common-anode configuration of the SZMMQA12VT1G affect PCB layout?
The common-anode configuration of the SZMMQA12VT1G-where pins 2 and 5 connect to the same internal anode node-allows all four cathodes (pins 1, 3, 4, 6) to be routed to separate signal lines while tying just two pins to ground or reference. This reduces net count, simplifies routing, and minimizes loop area compared to four discrete diodes. Layout best practice is to place a low-inductance ground plane directly beneath pins 2 and 5 to ensure effective surge current dissipation in SZMMQA12VT1G.
What is the maximum clamping voltage of the SZMMQA12VT1G under standard surge conditions?
The maximum clamping voltage of the SZMMQA12VT1G is 17.3 V, measured at a peak pulse current of 1.39 A using the 8/20 µs waveform (per Figure 6). This value represents the upper limit of voltage imposed on protected lines during worst-case ESD or lightning-induced surges. Designers use this spec to verify that connected ICs-such as 18 V-tolerant microcontrollers or 24 V industrial logic-remain within absolute maximum ratings when SZMMQA12VT1G activates.
Does the SZMMQA12VT1G require external biasing or control circuitry?
No, the SZMMQA12VT1G is a passive, two-terminal per channel device requiring no external bias, control signals, or power supply. Each cathode-anode path functions autonomously: it presents high impedance below 11.4 V and rapidly transitions to low-impedance conduction above breakdown. This self-triggering behavior makes SZMMQA12VT1G plug-and-play for ESD protection-engineers simply connect cathodes to signal lines and anodes to ground, with no firmware or support components needed.
SZMMQA12VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- SZMMQA
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 9.1V (Max)
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZMMQA12VT1G FAQ
1.How can I place an order for SZMMQA12VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMQA12VT1G 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 SZMMQA12VT1G reliable?
The price and inventory of SZMMQA12VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMQA12VT1G is usually 5 days.
3.What payment methods are accepted for SZMMQA12VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMQA12VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMQA12VT1G?
SZMMQA12VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMQA12VT1G 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 SZMMQA12VT1G?
For technical support, including SZMMQA12VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMQA12VT1G requirements.
6.How does Aetrix verify that SZMMQA12VT1G is sourced from the original manufacturer or authorized distributors?
All SZMMQA12VT1G 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 SZMMQA12VT1G meets industry standards.
7.What is the process for return or replacement of SZMMQA12VT1G?
All SZMMQA12VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMQA12VT1G, 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 SZMMQA12VT1G part is unused and in its original packaging.
Return procedure for SZMMQA12VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMQA12VT1G Tags
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