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onsemi MMSZ20ET1G
- Part No.:
- MMSZ20ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMSZ20ET1G.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:21,000
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Product details
Overview
MMSZ20ET1G from onsemi is a 20 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75 °C on FR−5 board, with 55 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 15.2 V, used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the MMSZ20ET1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, AEC−Q101 qualification status, and direct alternative part comparisons to support robust circuit design and BOM validation.
Technical Context
The MMSZ20ET1G operates as a two-terminal silicon Zener diode optimized for stable reverse-biased breakdown regulation. Its 20 V nominal Zener voltage exhibits a positive temperature coefficient (~4.5 mV/°C) per typical characterization curves, and it maintains regulation across −55 °C to +150 °C junction temperature range.
It supports transient suppression with 225 W nonrepetitive peak surge capability (8 × 20 µs pulse), complies with Class 3 ESD rating (>16 kV HBM), and features Pb−Free SOD−123 packaging validated for automated reflow assembly per JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, ±5% tolerance (19.0–21.0 V), measured at IZT = 5 mA, defining stable regulation point for feedback networks |
| Power Dissipation (PD) | 500 mW at TL = 75 °C on FR−5 board; derates linearly at 6.7 mW/°C above 75 °C - sets maximum continuous bias current limit |
| Zener Impedance (ZZT) | 55 Ω max at IZT = 5 mA and f = 1 kHz - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 0.05 µA max at VR = 15.2 V - ensures minimal quiescent current draw in high-impedance reference paths |
| Thermal Resistance (RJA) | 340 °C/W - defines junction-to-ambient temperature rise under steady-state power, critical for thermal margin analysis |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables handling without special ESD controls in standard assembly environments |
| AEC−Q101 Qualified | Validated for automotive applications including engine control modules and body electronics requiring reliability certification |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, Style 1), void-free thermosetting epoxy, cathode indicated by polarity band, UL 94 V−0 flammability rating, maximum soldering temperature 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node in shunt configuration; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or low-impedance return path; completes current loop during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in mid-power voltage references without heatsinking on standard FR−5 PCBs |
| ±5% Zener Voltage Tolerance | Supports cost-sensitive designs where tight regulation is balanced against component count and calibration overhead |
| AEC−Q101 Qualification | Meets automotive reliability requirements for under-hood and infotainment systems without additional qualification testing |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in board-level handling and system integration |
| Pb−Free SOD−123 Packaging | Complies with RoHS Directive 2011/65/EU and supports lead-free reflow profiles (J-STD-020) |
Applications
| Switching Power Supply Feedback | Automotive Sensor Reference |
|---|---|
Use Scenario: Provides stable 20 V reference for optocoupler-based feedback in isolated DC−DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference regulating error amplifier input in secondary-side feedback loop. Use Value: Maintains ±1% output regulation across line/load/temperature with 55 Ω dynamic impedance limiting AC error injection. |
Use Scenario: Supplies precise bias voltage to pressure or temperature sensor signal conditioning circuits in engine control units. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing higher-cost voltage references in analog front-end stages. Use Value: Delivers 0.05 µA leakage at 15.2 V to preserve microamp-level sensor bias accuracy over −40 °C to +125 °C. |
| Overvoltage Clamp Protection | Industrial PLC Input Conditioning |
Use Scenario: Clamps transient surges on 24 V industrial bus lines to protect downstream logic inputs. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated during >24 V excursions, absorbing up to 225 W peak surge energy. Use Value: Survives 8 × 20 µs pulses without degradation due to AEC−Q101-qualified construction and 340 °C/W thermal resistance. |
Use Scenario: Sets threshold voltage for digital input detection in programmable logic controller modules operating from 24 V rails. IC Role / Device Role / Timing Role: Precision voltage threshold element enabling reliable 20 V logic-high recognition with hysteresis design. Use Value: Enables consistent switching point across temperature with ±5% tolerance and known positive TC of ~4.5 mV/°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20 | Same 20 V ±5% Zener voltage, but SOT−23 package (higher RJA = 375 °C/W), 350 mW rating, no AEC−Q101 qualification | Preferred for space-constrained consumer PCBs where automotive qualification is unnecessary | Select when footprint compatibility with SOT−23 is required and thermal margin allows lower power rating |
| MMBZ5242B | 20 V ±5% Zener, SOT−23 package, 350 mW, 25 Ω ZZT @ 20 mA, but only Class 2 ESD (4 kV HBM), not AEC−Q101 qualified | Used in cost-optimized battery-powered devices where tighter impedance matters more than automotive compliance | Choose when lower dynamic impedance is prioritized and ESD/automotive requirements are relaxed |
Compared with MMSZ20ET1G, BZX84-C20 offers smaller footprint but reduced power and no automotive qualification, while MMBZ5242B provides lower impedance at higher test current but sacrifices ESD robustness and automotive reliability - MMSZ20ET1G uniquely balances 500 mW rating, AEC−Q101, and Class 3 ESD in SOD−123.
Availability
MMSZ20ET1G is available at Aetrix Electronics and suitable for switching power supplies, automotive sensor interfaces, overvoltage clamping circuits, and industrial PLC input conditioning requiring stable component supply and long-term lifecycle assurance.
Supply support for MMSZ20ET1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZxxxET1G series is designed for high-reliability voltage regulation in space-constrained, thermally demanding environments - targeting automotive ECUs, industrial power supplies, and ruggedized embedded systems.
FAQ
What is the Zener voltage tolerance of the MMSZ20ET1G?
The MMSZ20ET1G has a nominal Zener voltage of 20 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 19.0 V and 21.0 V when tested at IZT = 5 mA and TA = 25 °C. This tolerance is specified per the device's electrical characteristics table and applies across the full operating temperature range.
Is the MMSZ20ET1G suitable for automotive applications?
Yes, the MMSZ20ET1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control units, body electronics, and ADAS sensor interfaces. Its construction, thermal performance, and ESD robustness meet automotive reliability standards without requiring additional qualification.
What is the maximum peak surge power the MMSZ20ET1G can handle?
The MMSZ20ET1G supports a nonrepetitive peak surge power of 225 W for an 8 × 20 µs pulse waveform at TA = 25 °C. This capability enables transient overvoltage clamping in industrial and automotive power rails without device failure, as confirmed in Figure 4 of the official datasheet.
How does the MMSZ20ET1G perform thermally on a standard PCB?
The MMSZ20ET1G dissipates 500 mW at TL = 75 °C on FR−5 board, with linear derating of 6.7 mW/°C above that temperature. Its junction-to-ambient thermal resistance is 340 °C/W, so at 500 mW dissipation and 25 °C ambient, junction temperature rises to approximately 195 °C - underscoring the need for proper layout and thermal relief per the recommended footprint.
Does the MMSZ20ET1G have Pb−Free packaging?
Yes, the MMSZ20ET1G is supplied in a Pb−Free SOD−123 package compliant with RoHS Directive 2011/65/EU. The "G" suffix in the part number explicitly denotes Pb−Free construction, and the device supports standard lead-free reflow soldering profiles per JEDEC J-STD-020.
MMSZ20ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMSZ20ET1G FAQ
1.How can I place an order for MMSZ20ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ20ET1G 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 MMSZ20ET1G reliable?
The price and inventory of MMSZ20ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ20ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ20ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ20ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ20ET1G?
MMSZ20ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ20ET1G 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 MMSZ20ET1G?
For technical support, including MMSZ20ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ20ET1G requirements.
6.How does Aetrix verify that MMSZ20ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ20ET1G 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 MMSZ20ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ20ET1G?
All MMSZ20ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ20ET1G, 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 MMSZ20ET1G part is unused and in its original packaging.
Return procedure for MMSZ20ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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