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Diodes Incorporated MMSZ5245B-7
- Part No.:
- MMSZ5245B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5245B-7.pdf
- Description:
- DIODE ZENER 15V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,428
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Product details
Overview
MMSZ5245B-7 from Diodes Incorporated is a 15 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 8.5 mA test current, 16 Ω dynamic impedance at 1 kHz, and 0.1 µA reverse leakage at 11 V, widely used for voltage regulation and reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the MMSZ5245B-7 datasheet, MMSZ5245B-7 pinout, MMSZ5245B-7 application, or MMSZ5245B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), 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 to maintain stable voltage across its terminals under varying load or input conditions. Its 15 V nominal Zener voltage is specified at 8.5 mA test current, with temperature coefficient of +0.075 %/°C and maximum Zener impedance of 600 Ω at knee current (0.25 mA).
The device features a cathode band polarity marker, matte tin-plated alloy 42 leadframe, and UL 94V-0 molded plastic case. It is qualified to AEC-Q101 for automotive applications and exhibits 0.01 g mass and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 15 V - Stable regulation point at 8.5 mA, ±5% tolerance ensures predictable clamping in feedback networks. |
| Power Dissipation | 370 mW @ TA = +25°C - Maximum continuous power on FR-4 PCB with 1-inch copper pad; derates linearly above 25°C. |
| Zener Impedance | 16 Ω @ IZT = 8.5 mA, f = 1 kHz - Low dynamic resistance enables tight voltage regulation under dynamic load changes. |
| Reverse Leakage Current | 0.1 µA @ VR = 11 V - Minimal off-state current preserves efficiency in low-power bias/reference circuits. |
| Thermal Resistance | 338 °C/W (Junction-to-Ambient) - Determines temperature rise under load; requires thermal pad design for sustained 370 mW operation. |
| Package | SOD123 - Standard 2-pin surface-mount outline (2.65 mm × 1.55 mm × 1.05 mm) compatible with pick-and-place and reflow. |
Pinout & Package
Package: SOD123 - Molded plastic case with cathode band marking; terminals are anode and cathode; weight ≈ 0.01 g; UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in Zener regulator configuration | Connected to circuit common; reverse-biased operation requires cathode at higher potential. |
| Cathode | Input/output voltage reference node | Marked with band; supplies regulated voltage when reverse-biased; connects to feedback divider or clamp point. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
| Green compound & RoHS compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb); fully lead-free plating. |
| Automated assembly compatibility | SOD123 footprint optimized for high-speed placement and reflow soldering with standard stencil profiles. |
| Low leakage at low reverse voltage | 0.1 µA IR at 11 V enables use in precision bias networks where quiescent current must be minimized. |
Applications
| Switching Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 15 V threshold to TL431 or optocoupler LED drive circuit. Use Value: Tight ±5% VZ tolerance and low 16 Ω impedance ensure stable regulation across line/load transients. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 15 V. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage at sensitive input nodes during ESD or surge events. Use Value: Fast response in reverse breakdown and 0.1 µA leakage preserve signal integrity during normal operation. |
| Industrial Sensor Biasing | Automotive Body Control Module Reference |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric measurement circuits. Use Value: AEC-Q101 qualification and -65°C to +150°C operating range support harsh industrial environments. |
Use Scenario: Generating local 15 V reference for CAN transceiver biasing and MCU reset supervision in BCMs. IC Role / Device Role / Timing Role: Secondary voltage reference supplementing main LDO output for fault-tolerant monitoring. Use Value: SOD123 package enables compact layout; green/RoHS compliance meets automotive material requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C15 | 15 V, ±5%, 300 mW, SOD523 package, 20 Ω ZZT, 0.1 µA IR @ 11 V | Lower power rating and smaller footprint limit thermal margin in sustained 370 mW designs. | Select when board space is constrained and peak power remains below 300 mW. |
| MMBZ5245B | 15 V, ±5%, 350 mW, SOT-23 package, 16 Ω ZZT, 0.1 µA IR @ 11 V | Higher thermal resistance (400 °C/W) and lower power rating reduce reliability in high-ambient environments. | Prefer for legacy SOT-23 layouts where SOD123 rework is impractical. |
Compared with BZX584C15 and MMBZ5245B, MMSZ5245B-7 offers superior thermal performance (338 °C/W) and higher power handling (370 mW), making it optimal for automotive and industrial applications requiring long-term stability under elevated ambient temperatures.
Availability
MMSZ5245B-7 is available at Aetrix Electronics and suitable for switching power supply feedback, overvoltage clamp circuits, and industrial sensor biasing requiring stable component supply, AEC-Q101 qualification, and RoHS/Green compliance.
Supply support for MMSZ5245B-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 the Americas.
The MMSZ52xxB series targets cost-sensitive, high-volume applications requiring reliable voltage reference and protection, with emphasis on automotive, industrial, and consumer power management systems.
FAQ
What is the maximum continuous power dissipation for MMSZ5245B-7 at +75°C ambient?
At TL = +75°C, the maximum power dissipation is 500 mW per the datasheet's absolute maximum ratings table. This applies only when mounted on a thermally enhanced substrate (e.g., large copper plane), not standard FR-4. On FR-4 with 1-inch pad, derating begins at +25°C per Figure 1, yielding ~250 mW at +75°C.
Is MMSZ5245B-7 suitable for use in a precision 15 V reference circuit?
No - while its nominal Zener voltage is 15 V with ±5% tolerance, it lacks initial accuracy trimming or temperature-compensated design. For precision references, use bandgap-based ICs like REF5015 or LT1021. MMSZ5245B-7 serves best in non-critical regulation or clamping roles.
Does the SOD123 package support hand-soldering during prototyping?
Yes - the SOD123 package is compatible with manual soldering using fine-tip irons and flux. Recommended technique: preheat board to 100°C, apply localized heat to each terminal for ≤3 seconds, avoid mechanical stress on leads during cooling, and verify cathode band orientation before soldering.
How does the temperature coefficient affect regulation accuracy over -40°C to +125°C?
With a typical TC of +0.075 %/°C, the Zener voltage drifts approximately ±1.25% over a 165°C range. At +125°C, VZ rises to ~15.19 V; at -40°C, it drops to ~14.81 V. This 380 mV total span is acceptable for general-purpose regulation but insufficient for metrology-grade applications.
MMSZ5245B-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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 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
MMSZ5245B-7 FAQ
1.How can I place an order for MMSZ5245B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5245B-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 MMSZ5245B-7 reliable?
The price and inventory of MMSZ5245B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5245B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5245B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5245B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5245B-7?
MMSZ5245B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5245B-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 MMSZ5245B-7?
For technical support, including MMSZ5245B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5245B-7 requirements.
6.How does Aetrix verify that MMSZ5245B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5245B-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 MMSZ5245B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5245B-7?
All MMSZ5245B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5245B-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 MMSZ5245B-7 part is unused and in its original packaging.
Return procedure for MMSZ5245B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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