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Diodes Incorporated MMSZ5229BQ-7-F
- Part No.:
- MMSZ5229BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5229BQ-7-F.pdf
- Description:
- DIODE ZENER 4.3V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMSZ5229BQ-7-F from Diodes Incorporated is an AEC-Q101-qualified 4.3V Zener diode in SOD123 package, rated for 500mW power dissipation at TL=+75°C and 370mW at TA=+25°C, with 22Ω zener impedance at 20mA test current and 5.0μA reverse leakage at 1.0V, used for voltage regulation and reference in automotive power supply rails.
For engineers reviewing the MMSZ5229BQ-7-F datasheet, MMSZ5229BQ-7-F pinout, MMSZ5229BQ-7-F application, or MMSZ5229BQ-7-F equivalent, key selection criteria include its automotive qualification, tight 4.09–4.52V zener voltage tolerance, low 22Ω dynamic impedance, SOD123 thermal performance (RθJA = 338°C/W), and compatibility with automated surface-mount assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations, with nominal VZ = 4.3V at IZT = 20mA and a temperature coefficient near zero for this voltage range. Its 22Ω zener impedance ensures minimal output voltage deviation under changing current conditions.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and features a matte tin–plated alloy 42 leadframe, halogen/antimony-free green molding compound, and moisture sensitivity level 1 - enabling robust operation from –65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3V nominal, 4.09–4.52V min/max at 20mA - defines precision voltage clamp point |
| Power Dissipation | 370mW at TA=+25°C - sets maximum continuous DC power on standard FR-4 PCB |
| Zener Impedance (ZZT) | 22Ω at 20mA - determines AC regulation stability under dynamic load |
| Reverse Leakage (IR) | 5.0μA at VR = 1.0V - confirms low standby current in bias networks |
| Thermal Resistance (RθJA) | 338°C/W - quantifies junction-to-ambient heating under typical layout |
| Operating Temperature | –65°C to +150°C - supports under-hood and engine-control module environments |
Pinout & Package
Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: 1.55mm D × 2.65mm E × 3.65mm He; weight ≈ 0.01g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Reverse-bias breakdown terminal / Zener voltage output node | Connected to higher-potential rail; delivers stable 4.3V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per high-reliability stress testing (HTOL, TC, HAST, etc.) |
| SOD123 package | Enables high-density placement and reflow compatibility with standard SMT processes |
| Green molding compound | UL 94V-0 flammability rating and <900ppm Br/Cl content for environmental compliance |
| Matte tin lead finish | Solderable per MIL-STD-202 Method 208; compatible with Pb-free and SnPb reflow profiles |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5V microcontroller supply rail in BCM subassembly exposed to load dump transients. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp protecting downstream LDOs and MCU I/O. Use Value: Tight 4.09–4.52V tolerance and 22Ω impedance ensure stable reference despite battery voltage fluctuations. | Use Scenario: Providing precise bias voltage for analog front-end amplifiers in 4–20mA loop-powered sensors. IC Role / Device Role / Timing Role: Low-drift Zener reference source for ADC input scaling and DAC feedback. Use Value: 5.0μA leakage at 1.0V minimizes error contribution in high-impedance bias networks. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Reference |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for USB-C PD adapters. IC Role / Device Role / Timing Role: Zener shunt element in optocoupler feedback loop to regulate output voltage. Use Value: 370mW power rating supports sustained operation during transient overload conditions. | Use Scenario: Stable reference for precision analog signal chain in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-noise voltage reference for PGA gain-setting and ADC reference divider. Use Value: –65°C to +150°C operating range ensures reliability across clinical storage and operational environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C4V3 | Same 4.3V nominal, but SOT-23 package; 300mW rating; 40Ω impedance at 5mA | Higher thermal resistance limits power handling in compact layouts | Select when board space is constrained and lower power dissipation suffices |
| 1N4730A | 4.7V nominal; DO-35 through-hole; 1W rating; 9Ω impedance at 20mA | Not automotive-qualified; incompatible with SMT-only production | Select only for non-automotive prototyping where higher power and lower impedance are critical |
Compared with BZX584C4V3 and 1N4730A, MMSZ5229BQ-7-F uniquely combines AEC-Q101 qualification, SOD123 manufacturability, and optimized 4.3V/22Ω performance for automotive and industrial SMT designs requiring long-term reliability and thermal stability.
Availability
MMSZ5229BQ-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and consumer power adapter feedback requiring stable component supply and AEC-Q101 compliance.
Supply support for MMSZ5229BQ-7-F 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.
This device belongs to the MMSZ52xxB automotive Zener series, engineered specifically for voltage regulation and reference in harsh-environment automotive electronics where reliability, thermal stability, and process compatibility are critical.
FAQ
What is the maximum reverse voltage (VR) that MMSZ5229BQ-7-F can withstand before breakdown?
The device exhibits specified reverse leakage of 5.0μA at VR = 1.0V, but its nominal Zener breakdown occurs at 4.3V. The absolute maximum reverse voltage is not defined separately - operation above 4.52V (VZ max) risks exceeding power limits and thermal runaway unless current is strictly limited by external series resistance.
Is MMSZ5229BQ-7-F compatible with lead-free reflow soldering profiles?
Yes - it features matte tin–plated alloy 42 leads, qualified per MIL-STD-202 Method 208, and supports peak reflow temperatures up to 260°C for 10 seconds. Its SOD123 package and green molding compound are fully compatible with JEDEC J-STD-020 Class 1 (MSL Level 1) reflow processes.
How does the temperature coefficient affect regulation accuracy over automotive temperature ranges?
Per Figure 6 in DS18010, MMSZ5229B (4.3V type) has a temperature coefficient near 0%/°C - meaning its Zener voltage remains stable across –40°C to +125°C. This enables ±1% regulation accuracy without external compensation in engine bay and cabin applications.
Can MMSZ5229BQ-7-F replace MMSZ5230B (4.7V) in an existing design?
No - the 4.3V vs. 4.7V nominal Zener voltage creates a 0.4V offset that alters reference points, feedback ratios, and protection thresholds. Substitution requires recalculating series resistors, verifying power dissipation margins, and validating system-level regulation accuracy under all operating conditions.
MMSZ5229BQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 370 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5229BQ-7-F FAQ
1.How can I place an order for MMSZ5229BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5229BQ-7-F 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 MMSZ5229BQ-7-F reliable?
The price and inventory of MMSZ5229BQ-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5229BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5229BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5229BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5229BQ-7-F?
MMSZ5229BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5229BQ-7-F 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 MMSZ5229BQ-7-F?
For technical support, including MMSZ5229BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5229BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5229BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5229BQ-7-F 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 MMSZ5229BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5229BQ-7-F?
All MMSZ5229BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5229BQ-7-F, 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 MMSZ5229BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5229BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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