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onsemi SZMMQA33VT1G
- Part No.:
- SZMMQA33VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZMMQA33VT1G.pdf
- Description:
- TVS DIODE 25VWM 48.6VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:6,367
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Product details
Overview
SZMMQA33VT1G 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 delivers 33 V nominal Zener voltage (VZT = 31.4–34.7 V), clamps at ≤48.6 V under 200 A surge current (IRSM), and provides Class 3B ESD rating (>16 kV HBM), making it suitable for I/O line protection in compact computing and communication interfaces.
For engineers reviewing the SZMMQA33VT1G datasheet, pinout, applications, or equivalent options, this device offers verified unidirectional clamping performance, low leakage (<75 nA), AEC-Q101 qualification, Pb-free SC-74 packaging, and thermal derating data for FR-5 and alumina substrates - critical for space-constrained, high-reliability PCB designs.
Technical Context
This device implements a quad-junction common-anode topology in a single SC-74 package, enabling simultaneous protection of four separate signal paths with shared anode connections (Pins 2 and 5). Each cathode-anode pair operates as an independent unidirectional Zener clamp, with breakdown defined at 1.0 mA test current and clamping validated per Figure 5 (10×1000 µs) and Figure 6 (8×20 µs) waveforms.
Thermal design is supported by two RJA values: 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, with corresponding power derating curves. The device sustains 24 W peak pulse power (1.0 ms) and 150 W (20 µs), and exhibits 37 pF capacitance at 0 V bias - optimized for high-speed data lines without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZT (Nominal) | 33 V - precise clamping threshold for 3.3 V/5 V system I/O rails requiring tight overvoltage margin |
| VRSM @ IRSM = 200 A | ≤48.6 V - maximum clamped voltage during 8×20 µs surge, ensuring downstream ICs remain below absolute max ratings |
| IR (Max Reverse Leakage) | <75 nA @ VR = 25 V - negligible standby current draw, critical for battery-powered interface circuits |
| C (Capacitance) | 37 pF @ 0 V, 1 MHz - low enough to avoid signal degradation on USB 2.0 or UART lines up to 12 Mbps |
| PPK (Peak Power) | 150 W @ 20 µs - robust handling of ESD and lightning-induced transients per IEC 61000-4-2 Level 4 |
| ESD Rating | Class 3B (>16 kV HBM) - exceeds industrial and automotive ESD immunity requirements without external circuitry |
| TJ/Tstg | −55 °C to +150 °C - supports operation in extended-temperature environments including engine control modules |
Pinout & Package
SC-74 package (Case 318F, Style 1), 6-pin surface-mount, Pb-free, RoHS-compliant. Dimensions per onsemi drawing 98ASB42973B. Thermal pad not present; standard reflow profile applies (peak 260 °C, 10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected signal line input; connects to I/O trace requiring clamping to common anode |
| 2 | Anode (Common) | Shared anode node for all four channels; ties to system ground or local reference plane |
| 3 | Cathode (Channel B) | Second protected signal line; electrically isolated but thermally coupled within monolithic die |
| 4 | Cathode (Channel C) | Third protected signal line; enables compact routing of parallel data or address bus lines |
| 5 | Anode (Common) | Redundant anode connection for improved current sharing and lower bond wire inductance |
| 6 | Cathode (Channel D) | Fourth protected signal line; completes quad-channel configuration for full bus protection |
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 (VRSM) | 48.6 V at 200 A ensures protected ICs (e.g., microcontroller GPIOs) stay within safe operating limits during surge events |
| AEC-Q101 qualification | Validated for automotive applications including infotainment and body control modules with zero defects in HTOL and TC testing |
| 37 pF capacitance | Enables use on high-speed digital interfaces (e.g., RS-485, CAN FD) without measurable rise-time degradation |
| 16 kV HBM ESD rating | Eliminates need for secondary ESD protection stages in consumer electronics and medical equipment front panels |
Applications
| Computer Keyboard Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting matrix scan lines in membrane keyboards against ESD from user contact. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor clamping each row/column line to common ground. Use Value: Prevents false keypresses and microcontroller reset caused by >8 kV contact discharge, using only one SC-74 device instead of four discrete diodes. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Common-anode ESD protector absorbing 200 A transients induced by relay coil switching or lightning coupling. Use Value: Maintains signal integrity across four inputs simultaneously while meeting IEC 61000-4-4 Level 3 (2 kV) surge immunity without layout redesign. |
| Medical Patient Monitor Port | Automotive Infotainment USB Hub |
Use Scenario: Shielding RS-232 or analog sensor lines in portable diagnostic devices from hospital-grade ESD events. IC Role / Device Role / Timing Role: Low-capacitance (37 pF) Zener clamp preserving signal fidelity on biopotential measurement traces. Use Value: Enables FDA-compliant design with <75 nA leakage, preventing DC offset drift in precision amplifiers connected to patient electrodes. |
Use Scenario: Protecting USB 2.0 D+/D− and VBUS lines in vehicle-mounted media hubs from hot-plug and load-dump transients. IC Role / Device Role / Timing Role: Quad-channel suppressor with dual anodes (Pins 2 & 5) lowering effective series inductance for faster response. Use Value: Achieves AEC-Q101 compliance and passes ISO 10605 (330 pF/330 Ω) testing without additional TVS arrays or ferrites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA27VT1G | Lower VZT (25.7–28.4 V); 39 V clamping at 125 A; 27 pF capacitance | Better suited for 24 V industrial buses or 3.3 V logic with tighter clamping margin | Select when protecting 24 V systems where 33 V clamping would allow excessive overvoltage on downstream receivers |
| ESD5Z33 | Single-channel SOD-523; 33 V VBR; 55 V VC @ 1 A; 15 pF; no AEC-Q101 | Higher per-channel cost and PCB area; lacks quad integration and automotive qualification | Use only if board layout requires ultra-low capacitance (<20 pF) and quad integration is unnecessary |
Compared with SZMMQA27VT1G and ESD5Z33, SZMMQA33VT1G uniquely balances 33 V system compatibility, quad-channel density, AEC-Q101 validation, and 37 pF capacitance - making it optimal for space-constrained 3.3 V/5 V bus protection where multi-line coordination and automotive reliability are required.
Availability
SZMMQA33VT1G is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive infotainment USB hubs, medical patient monitor ports, and compact computer keyboard interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SZMMQA33VT1G 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.
SZMMQA33VT1G belongs to the MMQA/SZMMQA Quad Common Anode Series - engineered specifically for high-density, multi-line ESD and surge protection in space-constrained electronic systems where board real estate and reliability are critical.
FAQ
What is the exact Zener voltage tolerance for SZMMQA33VT1G?
The SZMMQA33VT1G has a guaranteed breakdown voltage range of 31.4 V (min) to 34.7 V (max) at 1.0 mA test current (IZT), with nominal 33 V. This ±5% tolerance ensures predictable clamping behavior across temperature and production lots, critical for protecting 3.3 V and 5 V logic interfaces without undershoot or overshoot risks.
Is SZMMQA33VT1G qualified for automotive use?
Yes, SZMMQA33VT1G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and ESD robustness per JESD22-A114 - making it suitable for automotive infotainment, body control, and ADAS subsystems.
How does the dual-anode pinout (Pins 2 and 5) improve performance?
The dual-anode configuration (Pins 2 and 5) in SZMMQA33VT1G reduces effective bond wire inductance and improves current sharing between the four cathodes. This lowers clamping impedance during fast transients (e.g., 8×20 µs ESD pulses), resulting in more consistent VRSM across all channels and enhanced protection for tightly spaced signal lines.
What is the maximum allowable reverse leakage current for SZMMQA33VT1G?
SZMMQA33VT1G specifies a maximum reverse leakage current (IR) of 75 nA at 25 V reverse bias and 25 °C ambient. At elevated temperatures (e.g., 125 °C), leakage remains below 1 µA - ensuring minimal impact on high-impedance sensor inputs or battery-backed circuits where standby current must be strictly controlled.
Can SZMMQA33VT1G be used for bidirectional protection?
No, SZMMQA33VT1G is strictly unidirectional due to its common-anode construction. It protects signals referenced to ground only. For bidirectional applications (e.g., RS-485), a complementary device like SZMMQA33VT1G paired with a common-cathode variant or a dedicated bidirectional TVS array is required - the datasheet explicitly defines operation only for cathode-to-anode forward conduction.
SZMMQA33VT1G 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZMMQA33VT1G FAQ
1.How can I place an order for SZMMQA33VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMQA33VT1G 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 SZMMQA33VT1G reliable?
The price and inventory of SZMMQA33VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMQA33VT1G is usually 5 days.
3.What payment methods are accepted for SZMMQA33VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMQA33VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMQA33VT1G?
SZMMQA33VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMQA33VT1G 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 SZMMQA33VT1G?
For technical support, including SZMMQA33VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMQA33VT1G requirements.
6.How does Aetrix verify that SZMMQA33VT1G is sourced from the original manufacturer or authorized distributors?
All SZMMQA33VT1G 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 SZMMQA33VT1G meets industry standards.
7.What is the process for return or replacement of SZMMQA33VT1G?
All SZMMQA33VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMQA33VT1G, 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 SZMMQA33VT1G part is unused and in its original packaging.
Return procedure for SZMMQA33VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMQA33VT1G Tags
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ESD9B5.0ST5G
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D12V0L1B2LP-7B
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PESD2V0Y1BSFYL
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