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Diodes Incorporated MMBZ5228B-7
- Part No.:
- MMBZ5228B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5228B-7.pdf
- Description:
- DIODE ZENER 3.9V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
MMBZ5228B-7 from Diodes Incorporated is a 3.9 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 23 Ω dynamic impedance at 1 kHz and 10 µA reverse leakage at 1.0 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits on FR-4 PCBs.
For engineers reviewing the MMBZ5228B-7 datasheet, MMBZ5228B-7 pinout, MMBZ5228B-7 application, or MMBZ5228B-7 equivalent, this page delivers verified electrical parameters, terminal mapping, thermal derating behavior, automotive-grade qualification path, and direct alternatives for voltage reference design and ESD-coupled clamping use cases.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled nominal voltage (3.9 V ±5%), low dynamic impedance (23 Ω at IZT = 20 mA), and minimal temperature coefficient. Its planar die construction ensures stable long-term voltage regulation under pulsed and DC bias conditions.
Designed for automated SMT assembly, it meets JEDEC reliability standards and supports operation across –65°C to +150°C ambient range. The device exhibits 10 µA reverse leakage at VR = 1.0 V and maintains <1.9 kΩ knee impedance at IZK = 0.25 mA, enabling reliable low-current reference generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.71–4.10 V range at IZT = 20 mA - defines stable regulation point for low-voltage references |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 23 Ω at f = 1 kHz, IZT = 20 mA - determines output voltage stability under load variation |
| Reverse Leakage (IR) | 10 µA at VR = 1.0 V - confirms low standby current in clamping or biasing applications |
| Thermal Resistance (RθJA) | 357 °C/W - enables junction temperature estimation for reliability margining |
| Operating Temperature | –65°C to +150°C - supports industrial and under-hood automotive environments |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode (Pin 2) | Zener breakdown terminal / voltage regulation output | Provides regulated 3.9 V when reverse-biased; connects to supply rail or protected node |
| No-Connect (Pin 3) | Internal die attach pad / mechanical support | Not electrically connected; serves thermal and mechanical anchoring function only |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable Zener characteristics across production lots |
| 350 mW dissipation on FR-4 | Supports self-contained regulation in space-constrained PCB layouts without external heatsinks |
| Lead-free & RoHS 3 compliant | Fulfills global environmental compliance requirements for consumer, industrial, and automotive end equipment |
| JEDEC-qualified high reliability | Validated for extended life in mission-critical applications per AEC-Q stress test protocols |
Applications
| Low-Voltage Reference Source | Overvoltage Clamp for GPIO Protection |
|---|---|
Use Scenario: Providing stable 3.9 V bias for op-amp input stages or ADC reference dividers in battery-powered sensors. IC Role / Device Role / Timing Role: Precision voltage reference element establishing fixed DC potential independent of supply variation. Use Value: Maintains <±2% output accuracy over –40°C to +85°C due to low tempco and 23 Ω ZZT, reducing calibration drift. |
Use Scenario: Clamping 5 V logic lines to prevent damage from ESD transients or supply overshoot in microcontroller peripherals. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting surge current above 3.9 V threshold before IC input structures fail. Use Value: Limits transient voltage to ≤4.1 V (max VZ) within nanoseconds, compatible with 5 V tolerant I/O specifications. |
| Power Supply Feedback Divider | Automotive Body Control Module Bias |
Use Scenario: Setting feedback voltage for adjustable buck converter ICs requiring accurate 3.9 V reference in point-of-load regulators. IC Role / Device Role / Timing Role: Stable voltage node defining output setpoint in closed-loop switching regulator control loop. Use Value: Enables ±1% output regulation accuracy with minimal load regulation error due to low ZZT and 20 mA IZT. |
Use Scenario: Generating local 3.9 V bias for LIN transceiver monitoring circuits or LED driver comparators in vehicle door modules. IC Role / Device Role / Timing Role: Robust voltage reference operating across –40°C to +125°C ambient with AEC-Q qualified variants available. Use Value: Supports IATF 16949-compliant manufacturing and PPAP documentation when ordered as MMBZ5228BQ-7-F variant. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V9 | Same 3.9 V nominal, but 300 mW PD, 60 Ω ZZT, higher 50 µA IR at 1.0 V | Lower power and higher impedance limit use in precision references or fast-clamp scenarios | Select when cost sensitivity outweighs regulation accuracy and thermal margin requirements |
| MM3Z3V9 | Same 3.9 V, 300 mW, but SOD-323 package (smaller footprint), 40 Ω ZZT, 20 µA IR | Reduced board area but higher thermal resistance limits sustained power handling | Prefer for ultra-compact designs where 350 mW derating and 23 Ω ZZT are not critical |
Compared with BZX84-C3V9 and MM3Z3V9, MMBZ5228B-7 offers superior regulation stability (23 Ω vs. ≥40 Ω ZZT) and higher power headroom (350 mW vs. 300 mW), making it optimal for industrial-grade references and robust clamping where thermal margin and voltage accuracy are prioritized.
Availability
MMBZ5228B-7 is available at Aetrix Electronics and suitable for low-voltage reference design, GPIO overvoltage protection, and automotive body electronics requiring stable component supply with full traceability and lifecycle management.
Supply support for MMBZ5228B-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 integrated circuits, specializing in high-reliability components for industrial, automotive, and computing markets.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes designed specifically for precision voltage regulation and transient suppression in space-constrained, high-volume SMT applications.
FAQ
What is the maximum reverse voltage (VR) at which leakage remains ≤10 µA?
The datasheet specifies 10 µA reverse leakage at VR = 1.0 V. At voltages below the Zener knee (≈3.0 V), leakage remains well under 10 µA; above 1.0 V and up to 3.7 V, leakage increases gradually but stays below 50 µA per typical curves. Operation above 3.7 V enters breakdown region.
Can MMBZ5228B-7 be used in place of a 3.3 V Zener like MMBZ5226B?
No - MMBZ5228B-7 has a nominal Zener voltage of 3.9 V (3.71–4.10 V range), while MMBZ5226B is 3.3 V (3.14–3.47 V). Substituting them would shift regulation or clamp thresholds by ~0.6 V, potentially violating circuit voltage tolerances or damaging downstream components.
Is the SOT23 pinout standardized across Diodes' Zener families?
Yes - all MMBZ52xxB devices use identical SOT23 pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC (mechanical tie-bar). This matches JEDEC TO-236AB standard and is confirmed in DS18011 Rev. 26 Figure "Top View Device Schematic".
Does MMBZ5228B-7 meet AEC-Q200 for passive components?
The base part does not carry AEC-Q200 certification; however, the automotive-grade variant MMBZ5228BQ-7-F is qualified to AEC-Q200, manufactured in IATF 16949 facilities, and supports PPAP documentation - required for automotive body electronics and infotainment systems.
MMBZ5228B-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:
- -
MMBZ5228B-7 FAQ
1.How can I place an order for MMBZ5228B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5228B-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 MMBZ5228B-7 reliable?
The price and inventory of MMBZ5228B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5228B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5228B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5228B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5228B-7?
MMBZ5228B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5228B-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 MMBZ5228B-7?
For technical support, including MMBZ5228B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5228B-7 requirements.
6.How does Aetrix verify that MMBZ5228B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5228B-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 MMBZ5228B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5228B-7?
All MMBZ5228B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5228B-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 MMBZ5228B-7 part is unused and in its original packaging.
Return procedure for MMBZ5228B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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