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Diodes Incorporated MMSZ5255B-7
- Part No.:
- MMSZ5255B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5255B-7.pdf
- Description:
- DIODE ZENER 28V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
MMSZ5255B-7 from Diodes Incorporated is a 28 V, 4.5 mA nominal Zener diode in SOD-123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 44 Ω dynamic impedance at test current and 0.1 µA reverse leakage at 21 V, widely used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5255B-7 datasheet, MMSZ5255B-7 pinout, MMSZ5255B-7 application, or MMSZ5255B-7 equivalent, key selection criteria include Zener voltage tolerance (±5% at 28 V), thermal resistance (338 °C/W), cathode-band polarity marking, RoHS-compliant green molding compound, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It exhibits a temperature coefficient of approximately +0.07 %/°C near 28 V, enabling predictable drift behavior in precision references.
The device uses alloy 42 leadframe with matte tin plating, supports automated SMT assembly, and is characterized with short-pulse testing to minimize self-heating effects during Zener voltage measurement at 4.5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28 V nominal, 26.6–29.4 V range at 4.5 mA - defines regulated output voltage tolerance |
| Power Dissipation (PD) | 370 mW at TA = +25°C - limits continuous DC power in PCB-mounted operation |
| Zener Impedance (ZZT) | 44 Ω at IZT = 4.5 mA - determines AC regulation stiffness and ripple rejection |
| Reverse Leakage (IR) | 0.1 µA at VR = 21 V - ensures minimal error current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W - governs junction temperature rise on standard FR-4 with 1-inch copper pad |
| Package | SOD-123 - surface-mount outline with 2.65 mm width, 1.55 mm length, 1.05 mm height |
| Qualification | AEC-Q101 qualified - validated for automotive electronics reliability requirements |
Pinout & Package
Two-terminal device in SOD-123 package; cathode identified by band marking. Terminals are unmarked anode and banded cathode; no internal circuitry or control logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to lower potential side in shunt regulator configuration |
| Cathode (banded) | Zener breakdown terminal / regulated output node | Provides stable 28 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables use in thermally constrained environments with localized heatsinking |
| AEC-Q101 qualification | Validates robustness for automotive infotainment, body control, and sensor interface modules |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance (Br+Cl < 1500 ppm, Sb < 1000 ppm) without compromising mold integrity |
| Moisture Sensitivity Level 1 | Eliminates bake requirement prior to reflow, supporting standard SMT line throughput |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
Use Scenario: Providing stable 28 V bias to pressure transducer bridge amplifiers in engine control units. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining excitation voltage despite battery fluctuations (9–16 V). Use Value: Enables <±0.5% full-scale accuracy over -40°C to +125°C due to tight VZ tolerance and known TC. | Use Scenario: Setting reference voltage for 12-bit ADC input scaling in programmable logic controller analog inputs. IC Role / Device Role / Timing Role: Precision DC reference source for ratiometric conversion in isolated signal chains. Use Value: Delivers sub-1 µA leakage and 44 Ω impedance to minimize gain error and noise coupling into high-Z input stages. |
| Consumer Power Supply Feedback | Medical Diagnostic Instrumentation |
Use Scenario: Secondary-side voltage sensing in flyback converters powering USB-C PD accessories. IC Role / Device Role / Timing Role: Zener-based feedback element in optocoupler-coupled regulation loop. Use Value: Maintains ±2% output regulation across line/load transients while fitting compact SOD-123 footprint. | Use Scenario: Calibration voltage source for portable ECG front-end gain stages. IC Role / Device Role / Timing Role: Low-drift DC reference for offset trimming and ADC reference buffering. Use Value: Supports AEC-Q101 reliability and green material compliance required for Class II medical device certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C27LT1G | 27 V nominal, ±5% tolerance, 300 mW PD, SOD-323 package | Lower power rating and smaller footprint; higher thermal resistance (450 °C/W) | Select when board space is critical and 27 V suffices with tighter layout thermal management |
| MMBZ5255BS | 28 V nominal, same Zener specs, but SOT-23 package with 3 pins (cathode/anode/NC) | Requires different land pattern; NC pin adds routing overhead but enables dual-diode variants | Choose for mixed-signal boards already using SOT-23 footprints and requiring pin-compatible family scalability |
Compared with BZX584C27LT1G and MMBZ5255BS, MMSZ5255B-7 offers superior power handling (370 mW vs. 300 mW) and lower thermal resistance (338 vs. 450 °C/W), making it preferable for sustained regulation in ambient temperatures up to +85°C without derating.
Availability
MMSZ5255B-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference design, and consumer power supply feedback requiring stable component supply with AEC-Q101 assurance and green material compliance.
Supply support for MMSZ5255B-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 in automotive, industrial, and consumer power management systems.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5255B-7?
The nominal Zener voltage is 28 V with a guaranteed range of 26.6 V to 29.4 V at 4.5 mA test current. Breakdown begins within this range; operation below 26.6 V ensures non-conductive reverse state with ≤0.1 µA leakage at 21 V, per datasheet specifications.
Can MMSZ5255B-7 be used in place of a 27 V Zener diode?
No - its 28 V nominal rating and ±5% tolerance (26.6–29.4 V) do not overlap the typical 27 V Zener range (25.65–28.35 V for MMSZ5254B). Substituting risks overvoltage in circuits relying on precise 27 V clamping or regulation.
Is the SOD-123 package compatible with standard reflow profiles?
Yes - MMSZ5255B-7 is rated Moisture Sensitivity Level 1 and qualified for lead-free reflow per J-STD-020. Its matte tin-plated alloy 42 leadframe ensures reliable solder wetting under standard IPC/JEDEC profiles without pre-bake.
Does MMSZ5255B-7 support bidirectional transient suppression?
No - it is a unidirectional Zener diode optimized for DC voltage regulation in reverse bias. For bidirectional ESD or surge protection, dedicated TVS diodes such as D24Z28M or SMAJ28A are required.
MMSZ5255B-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):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5255B-7 FAQ
1.How can I place an order for MMSZ5255B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5255B-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 MMSZ5255B-7 reliable?
The price and inventory of MMSZ5255B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5255B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5255B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5255B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5255B-7?
MMSZ5255B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5255B-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 MMSZ5255B-7?
For technical support, including MMSZ5255B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5255B-7 requirements.
6.How does Aetrix verify that MMSZ5255B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5255B-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 MMSZ5255B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5255B-7?
All MMSZ5255B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5255B-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 MMSZ5255B-7 part is unused and in its original packaging.
Return procedure for MMSZ5255B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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