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Diodes Incorporated MMSZ5228B-7
- Part No.:
- MMSZ5228B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5228B-7.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,988
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Product details
Overview
MMSZ5228B-7 from Diodes Incorporated is a 3.9 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current, 23 Ω zener impedance at 20 mA, and 10 µA reverse leakage at 1.0 V, widely used for voltage regulation and reference in power supply feedback loops.
For engineers reviewing the MMSZ5228B-7 datasheet, MMSZ5228B-7 pinout, MMSZ5228B-7 application, or MMSZ5228B-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5.1%), thermal resistance (338 °C/W), AEC-Q101 qualification status, and SOD123 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 3.9 V nominal zener voltage exhibits a positive temperature coefficient of approximately +0.04 %/°C per Figure 6, and it delivers regulated output within ±5.1% tolerance over the 3.71–4.10 V range at 20 mA.
The device is optimized for medium-current, general-purpose regulation with low dynamic impedance (23 Ω @ 20 mA) and minimal capacitance (<10 pF typical). It is qualified to AEC-Q101 for automotive applications and features a cathode band polarity marker on the SOD123 molded plastic case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.71–4.10 V min/max at 20 mA - defines precise regulation point for feedback networks |
| Power Dissipation | 370 mW @ TA = +25°C - sets maximum continuous DC power handling on standard FR-4 PCB |
| Zener Impedance (ZZT) | 23 Ω @ IZT = 20 mA - ensures tight voltage regulation under dynamic load changes |
| Reverse Leakage (IR) | 10 µA @ VR = 1.0 V - confirms low standby current in undervoltage protection circuits |
| Thermal Resistance (RθJA) | 338 °C/W - determines junction temperature rise under given ambient and power conditions |
| Operating Temperature | −65 to +150 °C - supports extended-range industrial and automotive environments |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g; RoHS-compliant matte tin finish on Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node in shunt regulation; forms return path for zener current |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; maintains 3.9 V above anode when reverse-biased ≥1.0 V |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables higher transient power handling on thermally anchored pads without derating |
| AEC-Q101 qualified | Validated reliability for automotive under-hood and infotainment power rails |
| SOD123 package with J-STD-020 Level 1 moisture sensitivity | Supports standard reflow profiles without baking; compatible with high-speed pick-and-place |
| Halogen- and antimony-free "Green" compound | Meets stringent environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) for global markets |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulates output voltage in flyback or buck converter secondary-side feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener reference element providing stable 3.9 V threshold to bias optocoupler LED and set regulation setpoint. Use Value: Tight 3.71–4.10 V tolerance and low 23 Ω impedance ensure <±1% output voltage accuracy across line/load/temperature. |
Use Scenario: Clamps input rail during surge events in 5 V or 3.3 V system interfaces (e.g., USB, GPIO). IC Role / Device Role / Timing Role: Shunt clamping device that conducts excess current when voltage exceeds 3.9 V, diverting energy to ground. Use Value: 10 µA leakage at 1.0 V minimizes quiescent loss; 370 mW dissipation handles short-duration transients without thermal runaway. |
| Low-Power Sensor Reference | Microcontroller Reset Threshold |
Use Scenario: Supplies stable bias voltage to analog front-end of temperature/humidity sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Precision voltage reference source replacing higher-cost IC references where ±5% accuracy suffices. Use Value: Low 0.01 g mass and SOD123 footprint enable compact sensor module layouts; −65 to +150 °C range supports outdoor deployment. |
Use Scenario: Sets brown-out detection threshold for ARM Cortex-M microcontrollers requiring 3.6–4.0 V reset assertion. IC Role / Device Role / Timing Role: Zener-based reset supervisor component generating clean reset signal via RC delay network. Use Value: Matched 3.9 V nominal voltage aligns with common MCU reset windows; cathode-band polarity prevents misorientation in high-volume assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V9 | 3.9 V, 300 mW, SOD-323 package, 90 Ω ZZ @ 5 mA | Lower power rating and higher impedance limit use to low-current biasing only | Select when board space is constrained and regulation stability requirements are relaxed |
| MMBZ5228BS | 3.9 V, 300 mW, SOT-23 package, 23 Ω ZZ @ 20 mA, same electrical specs but different footprint | Requires PCB redesign due to 3-pin SOT-23 vs. 2-pin SOD123 layout | Choose when existing SOT-23 land pattern exists and thermal performance on small pad is acceptable |
Compared with BZX584-C3V9 and MMBZ5228BS, MMSZ5228B-7 offers superior power handling (370 mW vs. 300 mW) and identical low-impedance regulation while maintaining industry-standard SOD123 assembly compatibility - making it optimal for cost-sensitive, medium-power automotive and industrial feedback designs.
Availability
MMSZ5228B-7 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, low-power sensor references, and microcontroller reset thresholds requiring stable component supply and AEC-Q101 reliability assurance.
Supply support for MMSZ5228B-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.
MMSZ5221B–MMSZ5259B is part of Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-yield voltage regulation in commercial and automotive power management systems.
FAQ
What is the maximum steady-state power dissipation for MMSZ5228B-7 at room temperature?
The MMSZ5228B-7 is rated for 370 mW power dissipation at ambient temperature (TA) of +25°C when mounted on an FR-4 PCB with a 1-inch copper pad layout. This value drops linearly with rising ambient temperature per the derating curve in Figure 1, reaching 500 mW only at lead temperature (TL) = +75°C under controlled thermal conditions.
Is MMSZ5228B-7 suitable for automotive applications?
Yes - MMSZ5228B-7 is explicitly qualified to AEC-Q101 standards for high-reliability automotive use. The "Q" suffix in ordering codes (e.g., MMSZ5228BQ-7-F) denotes automotive-grade screening, including stress testing for temperature cycling, humidity, and mechanical shock per AEC specifications.
How does the cathode band polarity affect PCB layout?
The cathode band on the SOD123 package must align with the PCB silkscreen cathode indicator or schematic symbol orientation. Incorrect placement reverses biasing, preventing Zener operation and potentially causing open-circuit behavior in shunt regulation. The band corresponds to the cathode terminal, which connects to the higher-potential node in normal use.
What is the typical zener impedance at low current levels?
At IZK = 0.25 mA, the MMSZ5228B-7 exhibits a maximum zener impedance (ZZK) of 1900 Ω, as specified in the Electrical Characteristics table. This higher impedance at knee current reflects reduced regulation effectiveness below 5 mA, so designs requiring stable reference below 1 mA should consider alternative topology or part selection.
MMSZ5228B-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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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
MMSZ5228B-7 FAQ
1.How can I place an order for MMSZ5228B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5228B-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 MMSZ5228B-7 reliable?
The price and inventory of MMSZ5228B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5228B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5228B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5228B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5228B-7?
MMSZ5228B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5228B-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 MMSZ5228B-7?
For technical support, including MMSZ5228B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5228B-7 requirements.
6.How does Aetrix verify that MMSZ5228B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5228B-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 MMSZ5228B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5228B-7?
All MMSZ5228B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5228B-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 MMSZ5228B-7 part is unused and in its original packaging.
Return procedure for MMSZ5228B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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