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Diodes Incorporated MMBZ5229B-7
- Part No.:
- MMBZ5229B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5229B-7.pdf
- Description:
- DIODE ZENER 4.3V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
MMBZ5229B-7 from Diodes Incorporated is a 4.3V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and transient overvoltage clamping in low-power analog and digital circuits. It delivers ±5% nominal Zener voltage tolerance (4.09–4.52V), 22Ω dynamic impedance at 20mA test current, and 5.0µA reverse leakage at 1.0V, supporting stable reference generation in power management and signal conditioning applications.
For engineers reviewing the MMBZ5229B-7 datasheet, MMBZ5229B-7 pinout, MMBZ5229B-7 application, or MMBZ5229B-7 equivalent, this part is selected for compact, high-reliability voltage reference and ESD protection roles where tight VZ tolerance, low ZZT, and JEDEC-qualified robustness on FR-4 PCBs are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 4.3V regulation point, specified at IZT = 20mA and characterized up to 150°C junction temperature. Its planar die construction ensures stable Zener characteristics across thermal cycles and automated reflow profiles.
The device exhibits 2,000Ω maximum Zener impedance at IZK = 0.25mA and maintains ≤5.0µA reverse leakage at VR = 1.0V - critical for low-current biasing and standby-mode voltage sensing in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3V nominal, 4.09–4.52V range at IZT = 20mA - enables precise 4.3V rail stabilization with ±5% tolerance. |
| Power Dissipation (PD) | 350mW on FR-4 PCB - supports continuous operation in space-constrained consumer and industrial PCBs without forced cooling. |
| Zener Impedance (ZZT) | 22Ω max at IZT = 20mA - ensures minimal output voltage variation under load transients in reference circuits. |
| Reverse Leakage (IR) | 5.0µA max at VR = 1.0V - guarantees negligible quiescent current draw in always-on monitoring nodes. |
| Thermal Resistance (RθJA) | 357°C/W - defines junction-to-ambient rise per watt; requires thermal pad layout per Diodes' SOT23 outline for rated dissipation. |
| Operating Temperature | −65°C to +150°C - qualified for extended-range industrial and automotive-adjacent environments without derating below −40°C. |
Pinout & Package
Package: SOT23 - 3-terminal plastic surface-mount package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground or lower-potential node when used as shunt regulator; defines polarity for reverse-bias operation. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input supply or signal line requiring clamping; provides stable 4.3V reference relative to anode. |
| No-Connect (Pin 3) | Non-functional mechanical support terminal | Internally unconnected; serves only as mechanical anchor and thermal path - must not be electrically tied to any net. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling and humidity exposure. |
| 350mW dissipation on FR-4 | Validated performance without thermal vias or copper pours - simplifies layout for cost-sensitive consumer PCBs. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br, <900ppm Cl, <1000ppm Sb - suitable for global commercial and industrial shipments. |
| JEDEC High Reliability qualification | Complies with AEC-Q stress test standards - supports use in non-automotive high-integrity systems requiring proven field reliability. |
Applications
| USB Port ESD Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamping transient voltages on USB D+/D− lines during hot-plug or ESD events. IC Role / Device Role: Shunt clamp diode placed between data line and ground, conducting above 4.3V to divert surge current. Use Value: Limits line voltage to safe levels (<5V) while maintaining signal integrity due to low ZZT and fast response of planar Zener structure. |
Use Scenario: Generating a stable reset threshold for 3.3V microcontrollers with internal brown-out detection. IC Role / Device Role: Precision voltage reference feeding comparator input to trigger reset when VCC drops below 4.3V × R-divider ratio. Use Value: Enables accurate 2.8–3.0V reset point with ±1.5% total error budget, leveraging tight VZ tolerance and low temperature coefficient. |
| Low-Power Sensor Biasing | Industrial Analog Input Protection |
|
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) or bridge sensors in battery-operated IoT nodes. IC Role / Device Role: Low-quiescent-current Zener reference supplying constant 4.3V bias to sensor elements. Use Value: Delivers stable excitation with <5µA leakage, minimizing battery drain while maintaining <0.1% measurement accuracy over −40°C to +85°C. |
Use Scenario: Protecting 4–20mA transmitter analog inputs against accidental 24V supply miswiring or lightning-induced surges. IC Role / Device Role: Primary shunt clamp limiting input voltage to 4.3V before downstream op-amp or ADC front-end. Use Value: Absorbs up to 350mW surge energy without degradation, verified per JEDEC high-reliability stress testing for industrial longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3V nominal, but 300mW rating and 40Ω ZZT - higher impedance and lower power margin. | Less suitable for high-accuracy references or sustained 20mA loads; acceptable for basic clamping. | Select when cost is prioritized over regulation precision and thermal headroom is constrained. |
| MMBZ5229BS-7-F | Same electrical specs, but SOD-323 package - 40% smaller footprint and 0.003g weight vs. SOT23's 0.008g. | Preferred for ultra-dense layouts; requires tighter placement tolerances and different reflow profile validation. | Select when board area is critical and assembly process supports fine-pitch SOD-323 handling. |
Compared with BZX84-C4V3 and MMBZ5229BS-7-F, the MMBZ5229B-7 offers superior thermal margin (350mW vs. 300mW), lower dynamic impedance (22Ω vs. 40Ω), and broader industrial temperature support - making it optimal for designs demanding stable regulation under variable load and ambient conditions.
Availability
MMBZ5229B-7 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, low-power sensor biasing, and industrial analog input protection requiring stable component supply and JEDEC-qualified reliability.
Supply support for MMBZ5229B-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, specializing in high-reliability, industry-qualified components for power management, signal integrity, and protection applications.
The MMBZ52xxB series belongs to Diodes' standard Zener diode product line, engineered for precision voltage reference and overvoltage clamping in cost-sensitive, high-volume consumer and industrial electronics.
FAQ
What is the maximum continuous Zener current for MMBZ5229B-7 at 25°C?
The device supports up to 81mA continuous Zener current at 25°C ambient, calculated from PD = 350mW and VZ = 4.3V (IZMAX = PD/VZ). Derating begins above 25°C per Fig. 1, reaching zero dissipation at 150°C.
Does MMBZ5229B-7 meet automotive qualification requirements?
No - MMBZ5229B-7 is not AEC-Q200 qualified. For automotive applications, Diodes offers the Q-suffix variant MMBZ5229BQ-7-F, which undergoes PPAP-capable manufacturing in IATF 16949-certified facilities and meets AEC-Q200 stress testing.
Can MMBZ5229B-7 be used in place of a 3.3V Zener diode?
No - its nominal Zener voltage is 4.3V with a 4.09–4.52V range; substituting it for a 3.3V device would result in incorrect regulation or clamping thresholds. Use MMBZ5226B-7 (3.3V) instead for that voltage point.
What is the recommended pad layout for SOT23 mounting of MMBZ5229B-7?
Diodes specifies a 2.0mm × 0.9mm pad center-to-center spacing with 0.8mm pad width (X), 1.35mm pad length (X1), and 2.9mm overall length (Y1). Full dimensions and copper pour guidelines are published in Diodes' SOT23 package outline document at diodes.com/package-outlines.html.
MMBZ5229B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 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:
- SOT-23-3
MMBZ5229B-7 FAQ
1.How can I place an order for MMBZ5229B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229B-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 MMBZ5229B-7 reliable?
The price and inventory of MMBZ5229B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5229B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5229B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5229B-7?
MMBZ5229B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229B-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 MMBZ5229B-7?
For technical support, including MMBZ5229B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229B-7 requirements.
6.How does Aetrix verify that MMBZ5229B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5229B-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 MMBZ5229B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5229B-7?
All MMBZ5229B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229B-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 MMBZ5229B-7 part is unused and in its original packaging.
Return procedure for MMBZ5229B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5229B-7 Tags
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