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Vishay General Semiconductor - Diodes Division MMSZ5255B-E3-08
- Part No.:
- MMSZ5255B-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5255B-E3-08.pdf
- Description:
- DIODE ZENER 28V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,151
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Product details
Overview
MMSZ5255B-E3-08 from Vishay Semiconductors is a silicon planar Zener diode rated for 28 V nominal Zener voltage at 4.5 mA test current, ±5 % tolerance, and 500 mW maximum power dissipation on leaded FR-4 board. It operates across -55 °C to +150 °C and delivers stable voltage reference in low-power analog circuits, power supply feedback paths, and overvoltage protection clamps.
For engineers reviewing the MMSZ5255B-E3-08 datasheet, MMSZ5255B-E3-08 pinout, MMSZ5255B-E3-08 application, or MMSZ5255B-E3-08 equivalent, this device is selected for precision voltage regulation where thermal stability (αVZ = +0.091 %/°C), low dynamic resistance (44 Ω at IZT), and AEC-Q101–qualified variants are critical design factors.
Technical Context
This Zener diode functions as a two-terminal voltage reference with single-junction silicon planar construction. Its operation relies on controlled reverse-biased avalanche breakdown at precisely defined VZ, stabilized by thermal equilibrium testing per JEDEC 51-3 conditions and validated under 4.5 mA IZT.
The device exhibits 44 Ω dynamic impedance at 4.5 mA and 21 Ω at 20 mA, with reverse leakage limited to 0.1 μA at VR = 21 V. Its positive temperature coefficient (+0.091 %/°C) ensures predictable drift behavior above 25 °C ambient, supporting stable biasing in temperature-varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28 V nominal at 4.5 mA; defines stable regulation point for reference or clamp circuits |
| Tolerance | ±5 %; enables cost-effective selection where tight voltage accuracy is not required |
| Power Dissipation | 500 mW max on leaded FR-4 board; sets thermal limit for continuous DC operation |
| Dynamic Resistance | 44 Ω at IZT = 4.5 mA; determines output impedance and load regulation sensitivity |
| Temperature Coefficient | +0.091 %/°C; quantifies VZ drift magnitude per degree rise above 25 °C |
| Reverse Leakage | ≤0.1 μA at VR = 21 V; ensures minimal quiescent current in high-impedance bias networks |
| Junction Temperature | 150 °C max; defines absolute thermal ceiling for reliable long-term operation |
Pinout & Package
SOD-123 surface-mount package with cathode bar marking; 2.7 mm × 3.7 mm footprint, 0.55 mm lead pitch, and 10.6 mg mass. Compliant with JEDEC MO-202, UL 94 V-0 molding compound, and MSL level 1 handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Reverse-bias input / regulated output node | Connected to input voltage source and load; maintains 28 V relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar Zener structure | Enables precise, repeatable breakdown voltage and low parameter variation across production lots |
| AEC-Q101 qualified variant available | Supports automotive-grade reliability requirements including ESD > 8 kV HBM without derating |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU for lead-free assembly and environmental compliance |
| Thermal resistance junction-to-ambient | 420 K/W on FR-4 board; allows direct thermal modeling for PCB layout and power derating |
| Low moisture sensitivity (MSL 1) | Permits indefinite dry storage and eliminates bake requirements before reflow soldering |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters using optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side feedback network. Use Value: Provides stable 28 V reference enabling ±5 % output regulation accuracy under line/load transients. |
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 28 V in industrial sensor interfaces. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground when input exceeds VZ. Use Value: Limits peak voltage to 28.5 V (max) with ≤0.1 μA leakage below clamp threshold, preserving signal integrity. |
| Reference Voltage Source | Current Source Bias |
Use Scenario: Generating fixed bias voltage for op-amp comparators or ADC reference buffers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision voltage node supplying stable 28 V to analog front-end circuitry. Use Value: Delivers <1 % total error over -40 °C to +85 °C due to predictable +0.091 %/°C TC and low ZZ. |
Use Scenario: Establishing constant current through LED strings or sensor excitation circuits using resistor-Zener combination. IC Role / Device Role / Timing Role: Voltage-setting element defining current via Ohm's law in series resistor network. Use Value: Enables 1.2 mA ±6 % current accuracy with 1 kΩ series resistor, leveraging ±5 % VZ tolerance and thermal stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C28 | 28 V ±2 % tolerance, SOD-523 package, 300 mW Ptot, higher ZZ (60 Ω) | Higher accuracy but lower power rating and smaller thermal mass | Select for space-constrained designs needing tighter tolerance; verify thermal margin at 4.5 mA |
| MM3Z28V | 28 V ±5 %, SOD-323 package, 300 mW Ptot, αVZ = +0.085 %/°C, 50 Ω ZZ | Smaller footprint and identical tolerance, but reduced power handling and slightly lower thermal stability | Choose when board area is critical and 300 mW suffices; confirm RthJA compatibility with layout |
Compared with MMSZ5255B-E3-08, BZX584-C28 offers tighter tolerance in a smaller package but sacrifices 40 % power capability and increases dynamic impedance, while MM3Z28V matches tolerance and voltage but reduces thermal robustness and power margin-making MMSZ5255B-E3-08 optimal for thermally demanding, medium-power regulation tasks.
Availability
MMSZ5255B-E3-08 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, reference voltage generation, and current source bias applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMSZ5255B-E3-08 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and performance.
The MMSZ52xx series targets general-purpose and automotive-grade voltage regulation, delivering precision Zener references in compact SOD-123 packages for cost-sensitive, thermally stable designs.
FAQ
What is the Zener voltage tolerance of MMSZ5255B-E3-08?
The MMSZ5255B-E3-08 has a nominal Zener voltage of 28 V with a tolerance of ±5 %, as indicated by the "B" suffix in its part number. This tolerance applies under standard test conditions at 4.5 mA and 25 °C ambient, and is verified per Vishay's production screening and thermal equilibrium testing protocol.
Can MMSZ5255B-E3-08 be used in automotive applications?
The base MMSZ5255B-E3-08 is commercial-grade and not AEC-Q101 qualified; however, the functionally identical MMSZ5255B-HE3_A-08 variant is AEC-Q101 qualified and supports automotive use. Engineers must select the HE3_A version for under-hood or safety-critical systems requiring automotive reliability validation.
What is the maximum reverse leakage current for MMSZ5255B-E3-08?
The MMSZ5255B-E3-08 specifies a maximum reverse leakage current of 0.1 μA at VR = 21 V, measured at 25 °C. This ultra-low leakage ensures minimal loading in high-impedance reference or bias networks, preserving accuracy in precision analog circuits.
How does the temperature coefficient affect MMSZ5255B-E3-08 performance?
The MMSZ5255B-E3-08 has a positive temperature coefficient of +0.091 %/°C, meaning its Zener voltage increases predictably with rising junction temperature. This behavior enables compensation in circuits where opposing TC elements are used, and supports stable operation up to +150 °C junction temperature.
What package type is used for MMSZ5255B-E3-08?
The MMSZ5255B-E3-08 uses the SOD-123 surface-mount package: 2.7 mm × 3.7 mm body size, cathode-bar marked, with 0.55 mm lead pitch and JEDEC MO-202 compliance. Its thermal resistance junction-to-ambient is 420 K/W on FR-4 board with recommended footprint.
MMSZ5255B-E3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5255B-E3-08 FAQ
1.How can I place an order for MMSZ5255B-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5255B-E3-08 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 MMSZ5255B-E3-08 reliable?
The price and inventory of MMSZ5255B-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5255B-E3-08 is usually 5 days.
3.What payment methods are accepted for MMSZ5255B-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5255B-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5255B-E3-08?
MMSZ5255B-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5255B-E3-08 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 MMSZ5255B-E3-08?
For technical support, including MMSZ5255B-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5255B-E3-08 requirements.
6.How does Aetrix verify that MMSZ5255B-E3-08 is sourced from the original manufacturer or authorized distributors?
All MMSZ5255B-E3-08 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 MMSZ5255B-E3-08 meets industry standards.
7.What is the process for return or replacement of MMSZ5255B-E3-08?
All MMSZ5255B-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5255B-E3-08, 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 MMSZ5255B-E3-08 part is unused and in its original packaging.
Return procedure for MMSZ5255B-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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