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Diodes Incorporated MMSZ5250B-7
- Part No.:
- MMSZ5250B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMSZ5250B-7.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
MMSZ5250B-7 from Diodes Incorporated is a 20V, ±5% tolerance, 500mW surface-mount Zener diode in SOD-123 package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning. It delivers 6.2mA test current, 25Ω dynamic impedance at 1kHz, <0.1µA reverse leakage at 15V, and operates across –65°C to +150°C.
For engineers reviewing the MMSZ5250B-7 datasheet, MMSZ5250B-7 pinout, MMSZ5250B-7 application, or MMSZ5250B-7 equivalent, key selection criteria include Zener voltage accuracy, thermal stability (TC ≈ +0.08%/°C), low leakage at rated VR, SOD-123 board space efficiency, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 20V (19.0–21.0V) at IZT = 6.2mA. Its 25Ω Zener impedance (ZZT) ensures stable regulation under moderate load transients, while the 0.1µA reverse leakage at VR = 15V supports low-power biasing and reference integrity.
The device uses alloy-42 leadframe with matte tin plating, conforms to J-STD-020 Level 1 moisture sensitivity, and achieves 338°C/W junction-to-ambient thermal resistance on FR-4 PCB - enabling reliable operation up to +75°C ambient when derated per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal, 19.0–21.0V range at 6.2mA - enables precise 20V rail clamping or reference generation |
| Power Dissipation | 500mW @ TL = +75°C - supports continuous regulation in thermally constrained layouts |
| Zener Impedance | 25Ω @ 1kHz, 6.2mA - maintains voltage stability during small-signal load variations |
| Reverse Leakage | <0.1µA @ VR = 15V - preserves low quiescent current in battery-powered references |
| Operating Temp | –65°C to +150°C - qualified for under-hood automotive and industrial control environments |
| Package | SOD-123 - 2.65mm × 1.55mm footprint compatible with high-density automated assembly |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test requirements |
Pinout & Package
Two-terminal device in SOD-123 plastic package; cathode identified by band marking. Terminals are anode (unmarked end) and cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower-potential side in shunt regulator configuration |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to input rail or feedback point; defines regulated voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 500mW Power Rating | Enables robust voltage clamping in 3.3V–24V supply rails without external heat sinking |
| AEC-Q101 Qualification | Validated for automotive infotainment, body control, and ADAS subsystems requiring high-reliability discrete components |
| Lead-Free & Halogen-Free | Meets RoHS 2 (2011/65/EU) and JEDEC green standards - suitable for eco-compliant industrial and consumer designs |
| SOD-123 Footprint | Reduces PCB area by >40% vs. DO-35; supports 0.5mm pitch reflow and AOI inspection in high-volume SMT lines |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 20V reference for LIN bus transceiver bias and microcontroller ADC reference. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation for analog front-end circuitry. Use Value: Maintains ±0.5% reference accuracy over –40°C to +125°C ambient, ensuring sensor linearity and communication integrity. |
Use Scenario: Clamping 24V fieldbus input to protect downstream op-amps and µC GPIOs. IC Role / Device Role / Timing Role: Overvoltage protection element limiting transient spikes to safe levels. Use Value: Absorbs 500mW surge energy without degradation, meeting IEC 61000-4-5 Level 3 immunity requirements. |
| Medical Portable Diagnostic Device | Smart Energy Meter Power Supply |
Use Scenario: Generating precision 20V bias for photodiode transimpedance amplifier. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing gain-setting network. Use Value: Delivers <0.1µA leakage and 25Ω impedance, minimizing offset drift and shot noise in µV-level signal paths. |
Use Scenario: Providing regulated 20V auxiliary supply for metrology IC and RTC backup. IC Role / Device Role / Timing Role: Primary shunt regulator in unregulated AC/DC flyback secondary stage. Use Value: Operates continuously at 6.2mA with <1% VZ drift over 10-year lifetime, supporting Class 0.2 meter accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C20 | 20V, ±5%, 300mW, SOD-523 package - 30% smaller footprint but 40% lower power rating | Preferred for ultra-compact wearables where board space dominates thermal budget | Select when PCB area < 1.0mm² is critical and peak dissipation stays below 300mW |
| 1N4744A | 20V, ±5%, 1W, DO-41 through-hole - higher power but incompatible with SMT automation | Used in legacy industrial controls requiring manual repair or high-surge robustness | Choose only for through-hole prototyping or replacement of existing DO-41 designs |
Compared with BZX584C20 and 1N4744A, MMSZ5250B-7 uniquely balances SMT compatibility, AEC-Q101 qualification, and 500mW capability - making it optimal for new automotive and industrial designs needing verified reliability in compact surface-mount form.
Availability
MMSZ5250B-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and portable medical diagnostics requiring stable component supply and long-term lifecycle assurance.
Supply support for MMSZ5250B-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener portfolio, engineered specifically for cost-sensitive, high-volume applications demanding AEC-Q101 compliance, tight voltage tolerance, and green material compliance.
FAQ
What is the maximum reverse voltage (VR) this Zener can block before breakdown?
MMSZ5250B-7 exhibits <0.1µA leakage at VR = 15V, and its specified Zener voltage range (19.0–21.0V) begins at 6.2mA test current. It is not rated for blocking above 15V in non-breakdown mode - operation above 15V assumes intentional reverse conduction.
Does this part support reflow soldering per JEDEC J-STD-020?
Yes - MMSZ5250B-7 is rated Moisture Sensitivity Level 1 (MSL-1), meaning it may be stored indefinitely at ≤30°C/60% RH and withstand standard Pb-free reflow profiles (peak 260°C) without baking or special handling.
How does temperature affect its Zener voltage stability?
Per Figure 6, MMSZ5250B-7 has a positive temperature coefficient of approximately +0.08%/°C near 20V. This means VZ increases ~16mV per °C rise - a known, linear drift that must be compensated in high-precision references.
Can this Zener replace MMSZ5250B without changes to the bill of materials?
Yes - MMSZ5250B-7 is the tape-and-reel variant of MMSZ5250B (same electrical specs, SOD-123 package, and marking). The "-7" suffix denotes 3,000-piece reel packaging; no circuit or layout modifications are required for substitution.
MMSZ5250B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- 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:
- -
MMSZ5250B-7 FAQ
1.How can I place an order for MMSZ5250B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5250B-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 MMSZ5250B-7 reliable?
The price and inventory of MMSZ5250B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5250B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5250B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5250B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5250B-7?
MMSZ5250B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5250B-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 MMSZ5250B-7?
For technical support, including MMSZ5250B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5250B-7 requirements.
6.How does Aetrix verify that MMSZ5250B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5250B-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 MMSZ5250B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5250B-7?
All MMSZ5250B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5250B-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 MMSZ5250B-7 part is unused and in its original packaging.
Return procedure for MMSZ5250B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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