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Diodes Incorporated MMSZ5229BS-7
- Part No.:
- MMSZ5229BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5229BS-7.pdf
- Description:
- DIODE ZENER 4.3V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,144
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Product details
Overview
MMSZ5229BS-7 from Diodes Incorporated is a surface-mount 4.3 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, 22 Ω zener impedance at 20 mA test current, and 5.0 µA reverse leakage at 1.0 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the MMSZ5229BS-7 datasheet, MMSZ5229BS-7 pinout, MMSZ5229BS-7 application, or MMSZ5229BS-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (625 °C/W), cathode-band polarity marking, and compatibility with automated SMT assembly on FR-4 PCBs using J-STD-020D Level 1 moisture handling.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under controlled current conditions. Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance (22 Ω at IZT = 20 mA) for reliable regulation in low-current (<20 mA) applications.
The device exhibits 5.0 µA maximum reverse leakage at VR = 1.0 V and a forward voltage of 0.9 V at IF = 10 mA. Its SOD-323 package supports high-density layouts and complies with RoHS, halogen-free, and antimony-free "Green" requirements per Diodes Incorporated specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 4.3 V - Stable regulation point at 20 mA test current, ±5% tolerance (4.09–4.52 V) |
| Power Dissipation | 200 mW - Maximum continuous DC power at 25°C ambient; derates linearly above 25°C per Fig. 1 |
| Zener Impedance | 22 Ω @ IZT = 20 mA - Low dynamic resistance enables tight voltage regulation under load variation |
| Reverse Leakage Current | 5.0 µA @ VR = 1.0 V - Minimal off-state current ensures low quiescent power in standby circuits |
| Forward Voltage | 0.9 V @ IF = 10 mA - Predictable conduction threshold for polarity-sensitive protection schemes |
| Thermal Resistance | 625 °C/W - Junction-to-ambient value assumes standard FR-4 pad layout per AP02001 |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.30–2.70 mm length, 1.20–1.40 mm width, 0.25–0.35 mm thickness), cathode indicated by band marking, lead-free matte tin plating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in reverse-bias regulation; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; connected to regulated rail; defines clamping voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| SOD-323 package footprint | Enables high-density PCB layouts and compatibility with standard 0805-class pick-and-place equipment |
| Lead-free & RoHS compliant | Fully compliant with EU Directive 2011/65/EU; no purposely added lead or hazardous substances |
| Halogen- and antimony-free | Meets "Green" definition: <900 ppm Br, <900 ppm Cl, <1000 ppm Sb compounds |
Applications
| Power Supply Rail Clamp | Low-Power Reference Generator |
|---|---|
Use Scenario: Clamping 3.3 V logic supply against transient overvoltage during hot-swap or ESD events. IC Role / Device Role / Timing Role: Shunt regulator providing fast-response voltage limiting at system input stage. Use Value: 4.3 V breakdown prevents downstream IC damage while drawing only 5 µA leakage at 1 V reverse bias. |
Use Scenario: Generating stable 4.3 V reference for ADC biasing in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Passive voltage reference source with minimal quiescent current draw. Use Value: 22 Ω zener impedance ensures <±10 mV shift under 1 mA load variation, supporting 12-bit accuracy. |
| Signal-Level Voltage Limiter | Microcontroller Reset Circuit |
Use Scenario: Limiting analog sensor output swing to protect MCU input pins from overvoltage. IC Role / Device Role / Timing Role: Bidirectional clamp (forward + reverse) defining safe signal envelope. Use Value: 0.9 V forward drop and 4.3 V reverse breakdown define symmetric ±4.3 V clipping window. |
Use Scenario: Providing brown-out detection threshold for PIC or ARM Cortex-M reset logic. IC Role / Device Role / Timing Role: Voltage-sensing element triggering external reset IC or internal BOD comparator. Use Value: Tight 4.09–4.52 V tolerance enables precise reset activation at 4.3 V ±5%, avoiding false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C4V3 | 4.3 V nominal, 300 mW rating, SOD-323, higher power but larger zener impedance (40 Ω) | Preferred where higher surge energy absorption is required; less suitable for low-current precision references | Select when >200 mW dissipation margin is needed; verify thermal layout for 300 mW derating |
| MMBZ5229BS | Same electrical specs and SOD-323 package, but in SOT-23 (larger footprint, higher RθJA = 350 °C/W) | Better thermal performance in high-ambient environments; incompatible with ultra-dense SOD-323 layouts | Choose if board space allows SOT-23 and junction temperature must stay below 125°C at 150 mW |
Compared with BZX584-C4V3 and MMBZ5229BS, MMSZ5229BS-7 offers optimal balance of size, low leakage (5 µA), and tight regulation (22 Ω) for space-constrained, low-power analog designs-whereas alternatives trade either footprint, impedance, or thermal capability.
Availability
MMSZ5229BS-7 is available at Aetrix Electronics and suitable for power supply rail clamp, low-power reference generator, signal-level voltage limiter, and microcontroller reset circuit applications requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5229BS-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-standard components for consumer, industrial, and automotive markets.
MMSZ5229BS-7 belongs to the MMSZ52xxBS series of general-purpose Zener diodes designed for cost-effective, automated SMT voltage regulation and protection in space-constrained, low-power electronic systems.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5229BS-7?
The nominal Zener voltage is 4.3 V with a guaranteed range of 4.09 V to 4.52 V at 20 mA test current. Breakdown occurs within this range under specified test conditions; operation below 1.0 V reverse bias yields ≤5.0 µA leakage, per datasheet Table on page 2.
Can MMSZ5229BS-7 be used in place of a 3.3 V Zener diode?
No - MMSZ5229BS-7 is specifically rated for 4.3 V nominal Zener voltage. For 3.3 V regulation, MMSZ5226BS (3.3 V, ±5%) is the correct variant in the same series and package, with matching 200 mW rating and SOD-323 footprint.
Is the SOD-323 package compatible with reflow soldering per J-STD-020?
Yes - the device is rated for moisture sensitivity level 1 per J-STD-020D and supports standard Pb-free reflow profiles. Diodes Incorporated recommends using the pad layout in application note AP02001 for optimal thermal and mechanical reliability.
Does MMSZ5229BS-7 have a specified capacitance value?
No specific capacitance is listed in the DS31038 datasheet. Figure 4 shows typical total capacitance vs. nominal Zener voltage, estimating ~30–35 pF for 4.3 V devices at 0 V bias and 1 MHz - but this is not a guaranteed parameter and should be verified experimentally in high-frequency applications.
MMSZ5229BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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:
- SOD-323
MMSZ5229BS-7 FAQ
1.How can I place an order for MMSZ5229BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5229BS-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 MMSZ5229BS-7 reliable?
The price and inventory of MMSZ5229BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5229BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5229BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5229BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5229BS-7?
MMSZ5229BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5229BS-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 MMSZ5229BS-7?
For technical support, including MMSZ5229BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5229BS-7 requirements.
6.How does Aetrix verify that MMSZ5229BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5229BS-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 MMSZ5229BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5229BS-7?
All MMSZ5229BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5229BS-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 MMSZ5229BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5229BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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