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Diodes Incorporated MMSZ5229B-7-F
- Part No.:
- MMSZ5229B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5229B-7-F.pdf
- Description:
- DIODE ZENER 4.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:21,233
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Product details
Overview
MMSZ5229B-7-F from Diodes Incorporated is a 4.3 V, 500 mW surface-mount Zener diode in SOD-123 package, rated for 20 mA test current with 22 Ω zener impedance at 1 kHz and 5.0 µA reverse leakage at 1.0 V reverse voltage. 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 MMSZ5229B-7-F datasheet, MMSZ5229B-7-F pinout, MMSZ5229B-7-F application, or MMSZ5229B-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (338 °C/W), AEC-Q101 qualification status, and SOD-123 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 4.3 V nominal zener voltage exhibits a positive temperature coefficient typical of mid-voltage Zeners, and it is characterized at 20 mA test current with 22 Ω dynamic impedance at 1 kHz.
The device is rated for 370 mW power dissipation at 25°C ambient and derates linearly to 500 mW at 75°C lead temperature. It uses a matte tin–plated Alloy 42 leadframe, conforms to J-STD-020 Level 1 moisture sensitivity, and features cathode band polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.09–4.52 V range at 20 mA - defines clamping/reference level accuracy |
| Power Dissipation (PD) | 370 mW @ TA = 25°C - sets max continuous DC power in standard PCB layout |
| Zener Impedance (ZZT) | 22 Ω @ 1 kHz, 20 mA - determines AC regulation stability under small-signal ripple |
| Reverse Leakage (IR) | 5.0 µA @ VR = 1.0 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W - indicates junction-to-ambient heat transfer efficiency on FR-4 board |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g; RoHS-compliant, halogen-free molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in clamping configuration; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage regulation node | Connected to regulated rail; reverse-biased to maintain 4.3 V drop across load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = 75°C | Enables higher transient power handling than standard 370 mW rating at ambient, supporting surge-tolerant designs |
| AEC-Q101 qualified | Validated for automotive electronics use including infotainment power supplies and sensor interface protection |
| SOD-123 package with J-STD-020 Level 1 MSL | Eliminates pre-bake requirement for reflow assembly, reducing manufacturing cost and cycle time |
| Lead-free, halogen- and antimony-free "Green" construction | Meets global environmental compliance mandates without compromising thermal or electrical performance |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Power Monitoring |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs measuring thermistor or RTD outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode provides low-drift, low-noise 4.3 V reference for analog front-end biasing. Use Value: Tight 4.09–4.52 V tolerance and 22 Ω impedance minimize ADC quantization error under varying supply loads. |
Use Scenario: Clamping 5 V microcontroller supply rail against load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Shunt regulator absorbs excess energy during ISO 7637-2 pulse 5a events. Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability in under-dash environments. |
| USB-C Power Delivery Feedback Network | Medical Wearable Battery Voltage Monitor |
Use Scenario: Setting precise 4.3 V threshold in CC logic circuitry for USB PD sink detection. IC Role / Device Role / Timing Role: Zener establishes stable trip point for comparator-based VBUS presence sensing. Use Value: Low 5.0 µA leakage at 1.0 V ensures minimal quiescent current in always-on PD controller circuits. |
Use Scenario: Monitoring Li-ion cell voltage in compact ECG patch devices using discrete voltage divider + comparator. IC Role / Device Role / Timing Role: Provides accurate 4.3 V reference for low-battery warning threshold detection. Use Value: SOD-123 footprint enables high-density layout in space-constrained wearable PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C4V3 | 4.3 V ±5%, 300 mW PD, SOD-323 package, 40 Ω ZZT | Lower power rating and higher impedance limit use to ultra-low-current biasing only | Select when board area is constrained and 300 mW suffices; verify thermal margin on FR-4 |
| MMBZ5229BS | 4.3 V ±5%, 300 mW PD, SOT-23 package, 22 Ω ZZT, AEC-Q101 | Same electrical specs but larger SOT-23 footprint and higher RθJA (400 °C/W) | Choose if existing SOT-23 land pattern must be reused; expect greater thermal rise at full load |
Compared with BZX584C4V3 and MMBZ5229BS, MMSZ5229B-7-F delivers superior power handling (370 mW vs. 300 mW) and lower thermal resistance (338 °C/W) in the compact SOD-123 form factor-making it optimal for space- and power-sensitive industrial and automotive voltage reference designs.
Availability
MMSZ5229B-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB-C power delivery feedback circuits, and medical wearable battery monitors requiring stable component supply and AEC-Q101 compliance.
Supply support for MMSZ5229B-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, specializing in high-reliability, industry-qualified components for automotive, industrial, and consumer markets.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in cost-sensitive, high-volume surface-mount applications.
FAQ
What is the maximum continuous reverse current this Zener can handle at 25°C?
The MMSZ5229B-7-F is rated for 20 mA test current (IZT) and supports up to approximately 86 mA continuous reverse current at 25°C ambient before reaching its 370 mW power limit-calculated as 370 mW ÷ 4.3 V ≈ 86 mA. Derating applies above 25°C per Figure 1.
Is this part suitable for automotive under-hood applications?
Yes-MMSZ5229B-7-F is AEC-Q101 qualified and rated for −65°C to +150°C operating temperature. Its SOD-123 package, matte tin plating, and green molding compound meet automotive reliability and environmental requirements for non-safety-critical under-hood modules like lighting controls and HVAC sensors.
How does the 22 Ω zener impedance affect noise performance in reference circuits?
A 22 Ω dynamic impedance at 1 kHz means the diode introduces minimal AC impedance variation under small-signal conditions, resulting in low output noise and stable regulation when used with RC filtering. This value is confirmed in the Electrical Characteristics table and supports ≤10 µVpp noise in well-filtered 4.3 V references.
Can this Zener replace a 4.3 V TL431-based shunt regulator?
No-MMSZ5229B-7-F is a passive two-terminal Zener and lacks the active feedback, adjustable threshold, and 100 mA sink capability of the TL431. It serves only as a fixed-voltage clamp or reference; use only where simple, low-current regulation (<10 mA) and no adjustability are required.
MMSZ5229B-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:
- 500 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-123
MMSZ5229B-7-F FAQ
1.How can I place an order for MMSZ5229B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5229B-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 MMSZ5229B-7-F reliable?
The price and inventory of MMSZ5229B-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 MMSZ5229B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5229B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5229B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5229B-7-F?
MMSZ5229B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5229B-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 MMSZ5229B-7-F?
For technical support, including MMSZ5229B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5229B-7-F requirements.
6.How does Aetrix verify that MMSZ5229B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5229B-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 MMSZ5229B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5229B-7-F?
All MMSZ5229B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5229B-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 MMSZ5229B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5229B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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