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onsemi MM5Z43V
- Part No.:
- MM5Z43V
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523F
- Datasheet:
-
MM5Z43V.pdf
- Description:
- DIODE ZENER 43V 200MW SOD523F
- Quantity:
- Payment:
- Shipping:
Inventory:106,000
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Product details
Overview
MM5Z43V from Fairchild Semiconductor is a surface-mount Zener diode with a nominal zener voltage of 43 V, ±7% tolerance (40–46 V), 150 Ω dynamic impedance at 2 mA test current, and 200 mW power dissipation in the ultra-compact SOD-523F package. It provides precise voltage regulation in space-constrained power supply feedback loops, overvoltage protection circuits, and reference voltage generation for analog signal conditioning.
For engineers reviewing the MM5Z43V datasheet, pinout, applications, or equivalent options, this device is selected for low-profile, high-reliability DC voltage clamping and stabilization where thermal resistance (500 °C/W) and moisture sensitivity level 1 handling are critical design constraints.
Technical Context
The MM5Z43V operates as a reverse-biased silicon Zener diode, maintaining stable voltage across its terminals when reverse current exceeds the knee current (IZK = 0.5 mA). Its zener voltage is specified under 10 ms pulse test conditions to minimize self-heating effects during characterization.
Designed for operation across –55 °C to +150 °C, it features a cathode band marking on the SOD-523F body and uses matte tin (Sn) lead finish with green mold compound - compliant with RoHS and Pb-free requirements without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–46 V @ IZT = 2 mA - defines clamping threshold in overvoltage protection and feedback sensing |
| Zener Impedance (ZZT) | 150 Ω max @ 2 mA - limits regulation error under varying load current |
| Power Dissipation (PD) | 200 mW - sets maximum continuous steady-state power handling in PCB-mounted configuration |
| Reverse Leakage (IR) | 0.05 μA max @ VR = 30.1 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 500 °C/W - determines junction temperature rise above ambient at full power on FR-4 with minimum pad |
| Operating Temperature | –55 °C to +150 °C - supports deployment in automotive engine control units and industrial motor drives |
| Package | SOD-523F - 0.7 mm height, JEITA SC79-compliant footprint for high-density layout |
Pinout & Package
SOD-523F is a 2-terminal surface-mount plastic package with cathode indicated by a band. Total height ≤ 0.70 mm; land pattern per JEITA SC79 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during transient conduction |
| 2 | Cathode | Marked with band; connected to regulated output or reference node; source of stabilized voltage during Zener breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low profile | 0.7 mm max height enables use in slim consumer electronics and portable medical sensors |
| Pb-free & RoHS compliant | Meets global environmental regulations without requiring process requalification in assembly lines |
| Moisture Sensitivity Level 1 | Eliminates bake preconditioning before reflow, reducing manufacturing cycle time and cost |
| Green mold compound | Reduces halogen content while maintaining mechanical robustness and thermal stability |
| Matte tin (Sn) lead finish | Prevents whisker growth and ensures reliable solder joint integrity in long-life applications |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback path of isolated DC-DC converters to regulate output voltage within ±1%. IC Role / Device Role / Timing Role: Zener reference element setting TL431 cathode voltage threshold and enabling precise secondary-side regulation. Use Value: 43 V rating allows direct interface with 36 V nominal bus systems while accommodating 20% input transients without breakdown. | Use Scenario: Placed between microcontroller GPIO pin and 3.3 V rail to limit ESD-induced voltage spikes during hot-plug events. IC Role / Device Role / Timing Role: Passive clamping diode shunting surge energy to ground before internal protection structures activate. Use Value: 0.05 μA leakage at 30.1 V ensures no measurable loading on high-impedance input pins during normal operation. |
| Industrial Sensor Reference Voltage | Automotive Body Control Module Protection |
Use Scenario: Provides stable 43 V reference for ratiometric scaling of 4–20 mA loop transmitter outputs in factory automation systems. IC Role / Device Role / Timing Role: Precision voltage reference source for DAC output calibration and ADC gain adjustment circuitry. Use Value: 150 Ω ZZT ensures <0.3 V deviation across 0–100 μA load variation, meeting IEC 61000-4-5 surge immunity requirements. | Use Scenario: Installed across LIN bus transceiver supply pins to clamp load-dump transients up to 40 V in vehicle door modules. IC Role / Device Role / Timing Role: Transient voltage suppression element absorbing ISO 7637-2 Pulse 5a energy without latch-up. Use Value: SOD-523F package withstands 200 mW peak dissipation for ≥100 ms, covering typical load-dump duration in 12 V systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C43 | 43 V nominal, ±5% tolerance; 100 Ω ZZT @ 5 mA; SOD-523 package (not SOD-523F) | Higher test current shifts operating point; slightly tighter tolerance but higher impedance at low current | Preferred where tighter voltage tolerance is required and board layout allows minor footprint adjustment |
| MMSZ43ET1G | 43 V nominal, ±5% tolerance; 150 Ω ZZT @ 1 mA; SOD-123 package (2.7 × 1.6 mm vs. SOD-523F's 1.3 × 0.8 mm) | Larger footprint and higher RθJA (~400 °C/W) reduce thermal efficiency in dense layouts | Selected when higher surge current capability (500 mW) outweighs size constraints |
Compared with BZX584-C43 and MMSZ43ET1G, the MM5Z43V offers the smallest footprint and lowest profile among 43 V Zeners while maintaining industry-standard 200 mW rating and MSL1 handling - ideal for miniaturized, thermally constrained designs where exact 2 mA test-point operation is specified.
Availability
MM5Z43V is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body electronics, and portable medical devices requiring stable component supply with full traceability and lifecycle management.
Supply support for MM5Z43V 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MM5Z series belongs to Fairchild's precision Zener diode product line, engineered for compact, high-reliability voltage regulation in space- and thermal-constrained applications across automotive, industrial, and consumer markets.
FAQ
What is the zener voltage tolerance for MM5Z43V?
The MM5Z43V has a zener voltage range of 40 V to 46 V at 2 mA test current, corresponding to a ±7% tolerance around the nominal 43 V rating. This tolerance is verified per the manufacturer's electrical characteristics table and applies under pulse-test conditions (10 ms) to avoid thermal drift during measurement. The MM5Z43V maintains this specification across its full operating temperature range of –55 °C to +150 °C.
Is MM5Z43V compatible with lead-free reflow processes?
Yes, the MM5Z43V is fully compatible with lead-free reflow soldering. It features a matte tin (Sn) lead finish and meets RoHS compliance requirements. Its moisture sensitivity level is rated MSL1, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly. The SOD-523F package is qualified for peak reflow temperatures up to 260 °C per J-STD-020.
What is the maximum reverse leakage current for MM5Z43V?
The MM5Z43V exhibits a maximum reverse leakage current (IR) of 0.05 μA when biased at 30.1 V (70% of nominal VZ). This value is measured at TA = 25 °C and reflects the device's ability to maintain high-impedance behavior below its breakdown threshold - critical for low-power sensor biasing and battery-operated circuits where standby current must remain sub-nanoampere.
Does MM5Z43V have a defined cathode marking?
Yes, the MM5Z43V uses a visible cathode band on the SOD-523F package body to identify terminal 2 as the cathode. This marking aligns with JEITA SC79 standards and matches the polarity shown in the official electrical symbol diagram. Correct orientation is essential for proper reverse-bias operation; installing the MM5Z43V with reversed polarity will prevent zener conduction and may cause open-circuit failure in regulation paths.
What is the thermal resistance of MM5Z43V in standard mounting?
The MM5Z43V has a junction-to-ambient thermal resistance (RθJA) of 500 °C/W when mounted on an FR-4 PCB using the minimum recommended land pad per JEITA SC79. This value assumes natural convection only and no additional copper pour or thermal vias. At full 200 mW dissipation, this results in a ~100 °C junction-to-ambient temperature rise - confirming suitability for ambient environments up to +55 °C in sealed enclosures.
MM5Z43V Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523F
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523F
MM5Z43V FAQ
1.How can I place an order for MM5Z43V through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z43V 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 MM5Z43V reliable?
The price and inventory of MM5Z43V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z43V is usually 5 days.
3.What payment methods are accepted for MM5Z43V?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z43V transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z43V?
MM5Z43V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z43V 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 MM5Z43V?
For technical support, including MM5Z43V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z43V requirements.
6.How does Aetrix verify that MM5Z43V is sourced from the original manufacturer or authorized distributors?
All MM5Z43V 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 MM5Z43V meets industry standards.
7.What is the process for return or replacement of MM5Z43V?
All MM5Z43V units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z43V, 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 MM5Z43V part is unused and in its original packaging.
Return procedure for MM5Z43V:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM5Z43V Tags
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