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Diodes Incorporated MMSZ5258BS-7-F
- Part No.:
- MMSZ5258BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5258BS-7-F.pdf
- Description:
- DIODE ZENER 36V 200MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
MMSZ5258BS-7-F from Diodes Incorporated is a surface-mount silicon Zener diode with a nominal zener voltage of 36 V, ±5% tolerance (34.2–37.8 V), 200 mW power dissipation, 70 Ω maximum zener impedance at 3.4 mA test current, and 0.1 µA maximum reverse leakage at 27 V. It is used for precision voltage regulation and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5258BS-7-F datasheet, MMSZ5258BS-7-F pinout, MMSZ5258BS-7-F application, or MMSZ5258BS-7-F equivalent, key selection criteria include zener voltage accuracy, low leakage at rated VR, thermal resistance (625 °C/W), SOD-323 package compatibility with high-density PCB layouts, and RoHS-compliant lead-free plating.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low noise performance across production lots.
The device is characterized at 25 °C with a 3.4 mA test current (IZT), exhibits 70 Ω dynamic impedance (ZZT) at IZT and 700 Ω at knee current (ZZK = 0.25 mA), and maintains <0.1 µA reverse leakage (IR) up to 27 V - enabling reliable clamping in low-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 36 V - precise DC reference for feedback loops in LDOs or sensor biasing |
| Zener Voltage Range | 34.2–37.8 V - ±5% tolerance ensures predictable clamping threshold |
| Power Dissipation | 200 mW - limits continuous dissipation on standard FR-4 PCB without heatsinking |
| Zener Impedance | 70 Ω @ 3.4 mA - defines voltage regulation stiffness under small-signal load variation |
| Reverse Leakage Current | 0.1 µA @ 27 V - enables use in ultra-low-power monitoring circuits without loading error |
| Thermal Resistance | 625 °C/W - determines junction temperature rise under 200 mW load on standard pad layout |
| Package | SOD-323 - 2-pin surface-mount outline (2.3–2.7 mm × 1.2–1.4 mm) compatible with automated pick-and-place |
Pinout & Package
Package: SOD-323 - molded plastic case, cathode band marking, 0.004 g weight, UL 94V-0 rating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; voltage develops across cathode-to-anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parametric distribution and long-term stability of VZ across temperature and life |
| Lead-free & RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets EU Directive 2011/65/EU without post-process rework |
| SOD-323 package footprint | Enables high-density placement in space-constrained applications such as portable medical sensors |
| Low reverse leakage (0.1 µA) | Minimizes error in high-impedance voltage divider networks used in precision ADC references |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing reference voltage for bridge sensor amplifiers in factory automation transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference providing 36 V rail clamp and excitation bias point. Use Value: Maintains ±0.5% reference stability over –40°C to +85°C due to low TCZ and tight VZ tolerance. |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Zener-based voltage detector feeding RC delay network to supervisor IC. Use Value: Sub-µA leakage prevents premature discharge of hold-up capacitors during deep sleep modes. |
| USB-C Power Delivery Clamp | Automotive Cabin Control Panel ESD Protection |
Use Scenario: Overvoltage clamping on CC logic lines in USB-C PD controllers operating up to 20 V. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting CC line excursion beyond 36 V during fault events. Use Value: Fast response (<1 ns) and low capacitance (<2 pF) prevent signal integrity degradation on 300 kHz CC bus. |
Use Scenario: Secondary-level ESD protection for touch-button inputs exposed to ISO 10605 30 kV air discharge. IC Role / Device Role / Timing Role: Low-leakage shunt clamp absorbing ESD energy before reaching MCU GPIO pins. Use Value: 0.1 µA IR avoids false triggering of capacitive touch sensing while surviving 8 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C36 | Same 36 V nominal, but ±5% tolerance achieved via tighter binning; 350 mW power rating | Higher PD supports higher-energy transient clamping; larger SOD-523 package requires more board area | Select when >200 mW surge handling is required and SOD-523 footprint is acceptable |
| MMBZ5258ET1G | Identical electrical specs but in SOT-23 package; 350 mW PD; slightly higher ZZT (80 Ω) | SOT-23 offers better thermal dissipation and mechanical robustness in vibration-prone environments | Prefer for automotive under-hood applications where thermal margin and mounting reliability are critical |
Compared with BZX584-C36 and MMBZ5258ET1G, MMSZ5258BS-7-F provides optimal balance of ultra-low leakage, minimal footprint, and process compatibility for high-volume consumer electronics - especially where board space and standby current are constrained.
Availability
MMSZ5258BS-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller reset circuits, USB-C power delivery clamp designs, and automotive cabin control panel ESD protection requiring stable component supply and full traceability.
Supply support for MMSZ5258BS-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 MMSZ52xxBS series of general-purpose Zener diodes, designed specifically for cost-sensitive, high-reliability voltage reference and protection functions in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage (VR) this Zener diode can withstand without significant leakage?
The MMSZ5258BS-7-F specifies a maximum reverse leakage current of 0.1 µA at VR = 27 V. Beyond that, leakage rises nonlinearly; operation above 27 V is not recommended for precision reference use. The absolute maximum rating is 36 V, but sustained bias near that level increases thermal stress and degrades long-term stability.
Can this Zener be used in series to achieve higher reference voltages?
No - the MMSZ5258BS-7-F is not characterized or binned for series-connected operation. Variations in zener voltage tolerance (±5%), temperature coefficient mismatch, and dynamic impedance differences between units cause unpredictable total voltage and poor regulation. Use a single higher-voltage Zener or a dedicated reference IC instead.
Is the SOD-323 package suitable for reflow soldering per J-STD-020?
Yes - the device is rated for moisture sensitivity level 1 and qualified for standard Pb-free reflow profiles (peak 260°C). Its matte tin plating and Alloy 42 leadframe ensure reliable wetting and intermetallic formation. Recommended pad layout is documented in Diodes AP02001.
How does its zener impedance affect regulation accuracy in a 100 µA load application?
With ZZT = 70 Ω at 3.4 mA and rising sharply below 1 mA, the effective impedance at 100 µA is ~500–700 Ω. This causes ~50 mV output shift per 100 µA load change - acceptable for coarse clamping but insufficient for precision references. Add a bypass capacitor or use active regulation for tighter stability.
MMSZ5258BS-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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5258BS-7-F FAQ
1.How can I place an order for MMSZ5258BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5258BS-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 MMSZ5258BS-7-F reliable?
The price and inventory of MMSZ5258BS-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 MMSZ5258BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5258BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5258BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5258BS-7-F?
MMSZ5258BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5258BS-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 MMSZ5258BS-7-F?
For technical support, including MMSZ5258BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5258BS-7-F requirements.
6.How does Aetrix verify that MMSZ5258BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5258BS-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 MMSZ5258BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5258BS-7-F?
All MMSZ5258BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5258BS-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 MMSZ5258BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5258BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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