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onsemi MMSZ5226ET1
- Part No.:
- MMSZ5226ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5226ET1.pdf
- Description:
- DIODE ZENER 3.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,402
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Product details
Overview
MMSZ5226ET1 from onsemi is a 3.3 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 28 Ω dynamic impedance at 20 mA test current and 25 V reverse leakage voltage threshold. It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the MMSZ5226ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, ESD robustness (Class 3 HBM >16 kV), and SOD-123 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable voltage regulation under varying load and temperature conditions. Its 3.3 V nominal Zener voltage is specified at 20 mA test current (IZT) with ±5% tolerance, and it exhibits 28 Ω dynamic impedance (ZZT) at IZT and 1600 Ω impedance (ZZK) at 1 mA knee current (IZK).
Thermal performance is defined by 150 °C/W junction-to-lead resistance and 340 °C/W junction-to-ambient resistance, enabling predictable power derating above 75 °C. The SOD-123 package supports automated assembly and delivers 225 W nonrepetitive surge capability per 8 × 20 µs pulse waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.14–3.47 V @ 20 mA - defines regulated output range for reference or clamping circuits |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - sets maximum continuous DC power on FR-5 board |
| Zener Impedance (ZZT) | 28 Ω @ IZT = 20 mA - determines voltage deviation under load current changes |
| Reverse Leakage (IR) | 0.25 µA @ VR = 25 V - ensures minimal parasitic current in standby or high-impedance nodes |
| ESD Rating | Class 3 (>16 kV HBM) - provides robustness against handling and system-level electrostatic discharge |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm) - enables compact placement and reflow-compatible surface-mount assembly |
Pinout & Package
The MMSZ5226ET1 is housed in a 2-lead SOD-123 plastic surface-mount package with cathode indicated by a polarity band. Lead finish is corrosion-resistant and solderable, rated for 260 °C for 10 seconds during reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output or higher-potential node; reverse-bias terminal for Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes bias path for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating on FR-5 Board | Enables use in space-constrained, medium-current regulation without external heatsinking |
| ±5% Zener Voltage Tolerance | Supports cost-sensitive designs where tight voltage accuracy is not required |
| Class 3 ESD Robustness (>16 kV HBM) | Reduces need for external ESD protection in consumer and industrial interfaces |
| 225 W Nonrepetitive Surge Capability | Withstands transient overvoltage events such as EFT or lightning-induced surges |
| Pb-Free SOD-123 Package | Meets RoHS compliance requirements and supports lead-free reflow profiles |
Applications
| Low-Voltage Microcontroller Reference | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 3.3 V reference for ADCs or internal LDO feedback in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Precision voltage reference source maintaining regulation across temperature and supply variation. Use Value: Delivers <±5% voltage stability with 28 Ω dynamic impedance, minimizing ADC quantization error due to reference drift. | Use Scenario: Clamping USB D+ and D− lines to prevent damage from ESD or hot-plug transients. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor operating in reverse breakdown during overvoltage events. Use Value: Leverages Class 3 HBM rating and 225 W surge capability to absorb fast-rising ESD pulses without degradation. |
| Industrial Sensor Signal Conditioning | Legacy 3.3 V Logic Level Shifter |
Use Scenario: Biasing op-amp input stages or setting thresholds in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Stable DC bias generator compensating for temperature-induced offset in analog signal chains. Use Value: Maintains 3.3 V reference with <0.25 µA leakage at 25 V, preserving high-impedance sensor node integrity. | Use Scenario: Translating between 5 V microcontroller outputs and 3.3 V logic inputs in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Passive level-shifting element using forward conduction or Zener clamping depending on signal polarity. Use Value: Enables bidirectional translation with sub-1 V forward drop and precise 3.3 V clamping limit, reducing BOM count vs active translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V3 | 3.3 V ±5%, 300 mW rating, SOD-323 package (1.3 × 0.85 × 0.7 mm) | Lower power handling and smaller footprint; less thermal mass for rapid transient response | Select when board space is critical and peak power remains below 300 mW |
| MM3Z3V3T1G | 3.3 V ±5%, 200 mW rating, SOD-323 package, 30 Ω ZZT @ 5 mA | Lower test current and impedance measured at 5 mA; optimized for ultra-low-current biasing | Select for micropower applications where IZ < 10 mA and thermal margin is constrained |
Compared with MMSZ5226ET1, BZX584-C3V3 offers smaller size but reduced power capacity, while MM3Z3V3T1G trades power and impedance performance for minimal footprint and ultra-low bias current-making MMSZ5226ET1 optimal for general-purpose 500 mW regulation where thermal and surge robustness are prioritized.
Availability
MMSZ5226ET1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB interface protection, and low-voltage microcontroller reference applications requiring stable component supply across production lifecycles.
Supply support for MMSZ5226ET1 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 MMSZ52xxET1G series is designed for general-purpose, medium-current voltage regulation and clamping in surface-mount applications where reliability, small size, and high-volume manufacturability are essential.
FAQ
What is the nominal Zener voltage of the MMSZ5226ET1 and how is it tested?
The MMSZ5226ET1 has a nominal Zener voltage of 3.3 V, with a guaranteed range of 3.14 V to 3.47 V at 20 mA test current (IZT) and ambient temperature of 25 °C. This value is measured under thermal equilibrium conditions at lead temperature (TL) = 30 °C ±1 °C, per onsemi's standardized test methodology documented in the datasheet revision history.
Does the MMSZ5226ET1 meet automotive qualification standards?
The MMSZ5226ET1 is not AEC-Q101 qualified. However, its automotive-grade counterpart SZMMSZ5226ET1G carries the SZ prefix and is explicitly qualified to AEC-Q101 with PPAP capability. Engineers requiring automotive use must select the SZ-prefixed variant-not the MMSZ5226ET1-to ensure compliance with automotive reliability and change-control requirements.
What is the maximum reverse leakage current specification for the MMSZ5226ET1?
The MMSZ5226ET1 specifies a maximum reverse leakage current (IR) of 0.25 µA at a reverse voltage (VR) of 25 V and ambient temperature of 25 °C. This parameter is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 10, October 2025), and reflects the device's ability to minimize parasitic current in high-impedance bias networks.
Can the MMSZ5226ET1 be used in place of a 3.3 V voltage regulator IC?
No-the MMSZ5226ET1 is a two-terminal Zener diode, not a three-terminal voltage regulator IC. It requires an external current-limiting resistor and cannot supply regulated output current without significant voltage droop under load. It functions as a shunt regulator or reference element only, whereas regulator ICs provide active feedback, current limiting, and load regulation independent of input current.
What is the thermal resistance from junction to lead (RJL) for the MMSZ5226ET1?
The MMSZ5226ET1 has a junction-to-lead thermal resistance (RJL) of 150 °C/W, as specified in the Maximum Ratings table on page 1 of the onsemi datasheet. This value is measured via infrared scan method and enables accurate calculation of junction temperature rise above lead temperature under steady-state DC power dissipation.
MMSZ5226ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5226ET1 FAQ
1.How can I place an order for MMSZ5226ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5226ET1 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 MMSZ5226ET1 reliable?
The price and inventory of MMSZ5226ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5226ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ5226ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5226ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5226ET1?
MMSZ5226ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5226ET1 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 MMSZ5226ET1?
For technical support, including MMSZ5226ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5226ET1 requirements.
6.How does Aetrix verify that MMSZ5226ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5226ET1 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 MMSZ5226ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ5226ET1?
All MMSZ5226ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5226ET1, 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 MMSZ5226ET1 part is unused and in its original packaging.
Return procedure for MMSZ5226ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5226ET1 Tags
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