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Diodes Incorporated MMSZ5226B-7
- Part No.:
- MMSZ5226B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5226B-7.pdf
- Description:
- DIODE ZENER 3.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,529
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Product details
Overview
MMSZ5226B-7 from Diodes Incorporated is a 3.3 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current with 28 Ω dynamic impedance at 1 kHz and 25 µA reverse leakage at 1.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail regulation circuits.
For engineers reviewing the MMSZ5226B-7 datasheet, MMSZ5226B-7 pinout, MMSZ5226B-7 application, or MMSZ5226B-7 equivalent, key selection criteria include zener voltage tolerance (±3.6%), thermal resistance (338 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and SOD123 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 3.3 V nominal zener voltage is specified at 20 mA test current, with ±3.6% tolerance (3.14–3.47 V) and a temperature coefficient of approximately −0.04 %/°C.
The device exhibits 28 Ω zener impedance at 20 mA and 1 kHz, enabling effective regulation in low-current feedback paths. With 25 µA maximum reverse leakage at VR = 1.0 V and 370 mW power dissipation at TA = +25°C, it supports compact, thermally constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, 3.14–3.47 V range at IZT = 20 mA - defines stable regulation point for 3.3 V rail referencing |
| Power Dissipation (PD) | 370 mW at TA = +25°C - sets max continuous power in standard PCB layout without heatsinking |
| Zener Impedance (ZZT) | 28 Ω at IZT = 20 mA, f = 1 kHz - determines output voltage variation under load transients |
| Reverse Leakage (IR) | 25 µA max at VR = 1.0 V - ensures minimal quiescent current in standby or sensing circuits |
| Thermal Resistance (RθJA) | 338 °C/W - indicates junction-to-ambient rise per watt; requires thermal pad design for >100 mW operation |
| Operating Temperature | −65 to +150 °C - supports industrial and automotive ambient environments without derating |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking, 0.01 g weight, UL 94V-0 flammability rating, and matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in regulation circuit; forms reference ground for shunt configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; reverse-biased to maintain 3.3 V across load or feedback path |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables higher transient power handling on thermally anchored pads vs. 370 mW at ambient |
| AEC-Q101 qualified | Validated for automotive electronics use including engine control and body modules |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance: <900 ppm Br, <900 ppm Cl, <1000 ppm Sb |
| SOD123 package with J-STD-020 Level 1 moisture sensitivity | Allows standard reflow without baking; compatible with high-speed pick-and-place assembly |
Applications
| 3.3 V Microcontroller Power Rail Clamp | Low-Power Sensor Reference Divider |
|---|---|
Use Scenario: Clamping voltage spikes on 3.3 V supply lines feeding ARM Cortex-M0+ MCUs in industrial PLCs. IC Role / Device Role / Timing Role: Shunt regulator protecting MCU VDD pin from ESD-induced overvoltage during hot-swap events. Use Value: 3.3 V zener threshold aligns precisely with MCU absolute maximum rating; 25 µA leakage avoids loading LDO output. |
Use Scenario: Providing stable 3.3 V reference for resistive bridge sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Passive voltage reference in ratiometric measurement circuits where excitation voltage must track supply. Use Value: ±3.6% tolerance and −0.04 %/°C TC ensure <0.5% total error over −40 to +85 °C operating range. |
| USB-C Port Overvoltage Protection | Automotive LIN Bus Voltage Supervisor |
Use Scenario: Secondary overvoltage protection stage after TVS diode in USB-C PD sink applications. IC Role / Device Role / Timing Role: Precision clamping element limiting bus voltage to 3.3 V during fault conditions. Use Value: 28 Ω zener impedance ensures fast response to 100 ns transients while avoiding latch-up in downstream regulators. |
Use Scenario: Monitoring 12 V vehicle battery via resistive divider in LIN transceiver power management. IC Role / Device Role / Timing Role: Reference node in undervoltage detection circuit triggering safe shutdown below 9 V. Use Value: AEC-Q101 qualification and −65 to +150 °C rating guarantee reliability in under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C3V3 | 3.3 V, 300 mW, SOD-523 package, 90 Ω ZZT, 10 µA IR at 1 V | Lower power rating and higher impedance limit use to sub-5 mA loads | Select when board space is critical and thermal budget allows reduced power handling |
| MM3Z3V3T1G | 3.3 V, 200 mW, SOD-323 package, 90 Ω ZZT, 5 µA IR at 1 V | Smaller footprint but lower power and higher impedance reduce regulation stability | Prefer for ultra-compact consumer wearables where 370 mW dissipation is unnecessary |
Compared with BZX584C3V3 and MM3Z3V3T1G, MMSZ5226B-7 delivers superior thermal performance (338 °C/W vs. >500 °C/W), tighter voltage tolerance (±3.6% vs. ±5%), and higher power capability-making it optimal for industrial and automotive applications requiring robust voltage clamping under variable thermal conditions.
Availability
MMSZ5226B-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and USB-C power delivery protection circuits requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5226B-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and reference in commercial and automotive applications.
FAQ
What is the maximum continuous reverse current for MMSZ5226B-7 at 3.3 V regulation?
The device is rated for 20 mA test current (IZT) and supports up to 100 mA peak pulse current per Figure 2. Continuous operation above 20 mA requires thermal derating per the power derating curve in Figure 1, with full 370 mW dissipation only permissible at TA ≤ +25°C on FR-4 with 1-inch copper pad.
Is MMSZ5226B-7 suitable for use in automotive infotainment systems?
Yes-MMSZ5226B-7 is AEC-Q101 qualified and rated for −65 to +150 °C operation. Its SOD123 package, halogen-free construction, and stable 3.3 V reference make it appropriate for voltage supervision and ESD clamping in head unit power domains and display interface circuits.
How does the zener impedance affect regulation accuracy in feedback loops?
With 28 Ω zener impedance at 20 mA, MMSZ5226B-7 introduces ≤28 mV output deviation per 1 mA load change. This enables stable biasing in op-amp reference inputs and ADC voltage dividers where <0.1% regulation error is required under dynamic load conditions.
Can MMSZ5226B-7 replace MMSZ5226B without changes to PCB layout?
Yes-the "-7" suffix denotes 3,000-piece tape-and-reel packaging in SOD123; the electrical and mechanical specifications-including pinout, dimensions, and thermal characteristics-are identical to the base MMSZ5226B part. No layout or schematic modification is needed.
MMSZ5226B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5226B-7 FAQ
1.How can I place an order for MMSZ5226B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5226B-7 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 MMSZ5226B-7 reliable?
The price and inventory of MMSZ5226B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5226B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5226B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5226B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5226B-7?
MMSZ5226B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5226B-7 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 MMSZ5226B-7?
For technical support, including MMSZ5226B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5226B-7 requirements.
6.How does Aetrix verify that MMSZ5226B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5226B-7 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 MMSZ5226B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5226B-7?
All MMSZ5226B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5226B-7, 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 MMSZ5226B-7 part is unused and in its original packaging.
Return procedure for MMSZ5226B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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