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Diodes Incorporated MMSZ5239BS-7-F
- Part No.:
- MMSZ5239BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5239BS-7-F.pdf
- Description:
- DIODE ZENER 9.1V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,733
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Product details
Overview
MMSZ5239BS-7-F from Diodes Incorporated is a surface-mount silicon Zener diode with a nominal zener voltage of 9.1 V, ±5% tolerance (8.65–9.56 V), 200 mW power dissipation, and 10 Ω dynamic impedance at 20 mA test current. It operates across –65 °C to +150 °C and is used for precision voltage regulation and overvoltage protection in low-power analog circuits, sensor biasing, and reference supply rails.
For engineers reviewing the MMSZ5239BS-7-F datasheet, MMSZ5239BS-7-F pinout, MMSZ5239BS-7-F application, or MMSZ5239BS-7-F equivalent, key selection criteria include zener voltage accuracy, thermal resistance (625 °C/W), SOD-323 package footprint compatibility, and reverse leakage current (≤3.0 µA at 7.0 V).
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low noise performance. Its 9.1 V nominal zener voltage is specified at 20 mA test current, with dynamic impedance of 10 Ω at that condition and 600 Ω at 0.25 mA knee current - indicating sharp knee behavior suitable for reference applications.
The device is rated for 200 mW DC power dissipation on FR-4 PCB with recommended pad layout, derating linearly above +25 °C ambient per the 625 °C/W junction-to-ambient thermal resistance. Reverse leakage remains ≤3.0 µA up to 7.0 V, supporting low-current bias stability in precision circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 9.1 V - stable regulation point for 3.3 V/5 V system references and clamp thresholds |
| Zener Voltage Range | 8.65–9.56 V - ±5% tolerance ensures predictable clamping within industrial temperature range |
| Test Current (IZT) | 20 mA - standard operating point where zener voltage and impedance are guaranteed |
| Zener Impedance (ZZT) | 10 Ω @ 20 mA - low dynamic resistance enables tight regulation under varying load conditions |
| Power Dissipation (PD) | 200 mW - supports continuous operation in space-constrained SOD-323 footprint without forced cooling |
| Reverse Leakage (IR) | ≤3.0 µA @ 7.0 V - minimal parasitic current preserves accuracy in high-impedance bias networks |
| Junction Temp Range | –65 °C to +150 °C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SOD-323 - ultra-compact 2-pin surface-mount plastic case (2.30–2.70 mm length, 1.20–1.40 mm width, 0.25–0.35 mm height), cathode marked by band, RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during reverse-bias regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 9.1 V reference when reverse-biased; marked by band on package top view |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable zener voltage distribution and long-term stability under thermal cycling |
| SOD-323 package | Enables high-density PCB layouts and compatibility with standard 0805-class pick-and-place equipment |
| Lead-free & halogen-free | Fully RoHS 2 compliant (<900 ppm Br/Cl, <1000 ppm Sb) for green manufacturing and export compliance |
| Low thermal resistance | 625 °C/W junction-to-ambient allows 200 mW operation on minimal copper area without heatsinking |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Biasing op-amp input stages and setting reference voltages for 4–20 mA transmitters. IC Role / Device Role / Timing Role: Precision voltage reference and rail clamp for analog front-end circuits. Use Value: 9.1 V zener voltage provides margin above 5 V logic rails while maintaining low leakage (<3 µA) to avoid signal offset drift. |
Use Scenario: Clamping transient surges on VBUS line during hot-plug events in embedded USB peripherals. IC Role / Device Role / Timing Role: Low-capacitance shunt protector limiting voltage to safe levels before USB PHY ICs. Use Value: 200 mW rating and 10 Ω impedance enable fast response to 10–100 ns ESD pulses without latch-up or degradation. |
| Low-Power Microcontroller Reset Circuit | Automotive Cabin Control Panel Reference |
Use Scenario: Generating clean reset threshold for 3.3 V MCUs using resistor-divider + zener feedback. IC Role / Device Role / Timing Role: Stable voltage reference defining reset assertion level independent of supply ripple. Use Value: ±5% tolerance and –65 °C to +150 °C operation ensure reliable reset behavior across automotive cold-crank and hot-soak conditions. |
Use Scenario: Providing regulated bias for touch controller ADC references in dashboard displays. IC Role / Device Role / Timing Role: Low-noise DC reference source minimizing quantization error in 12-bit sensing circuits. Use Value: Planar construction and 10 Ω impedance suppress high-frequency noise coupling into sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C9V1 | Same 9.1 V nominal, but ±1% tolerance and 300 mW rating in SOD-523 package | Higher precision and power support; requires revised PCB land pattern | Select when tighter voltage tolerance or higher surge handling is required |
| MMBZ5239BS | Identical electrical specs, but in SOT-23 package (larger footprint, higher thermal mass) | Lower thermal resistance (400 °C/W) but occupies ~3× more board area | Select when manual rework or thermal margin outweighs miniaturization needs |
Compared with BZX584C9V1 and MMBZ5239BS, MMSZ5239BS-7-F offers optimal balance of miniaturization (SOD-323), industrial-grade temperature range, and cost-effective 5% tolerance - making it preferred for high-volume consumer and industrial PCBs where space and procurement consistency are critical.
Availability
MMSZ5239BS-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB peripheral protection, and automotive cabin electronics requiring stable component supply and full RoHS/Green compliance.
Supply support for MMSZ5239BS-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.
MMSZ5239BS-7-F belongs to the MMSZ52xxBS series of general-purpose Zener diodes designed specifically for compact, high-reliability voltage regulation in space-constrained consumer, computing, and industrial applications.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The MMSZ5239BS-7-F has a nominal zener voltage of 9.1 V with a guaranteed range of 8.65–9.56 V at 20 mA. Breakdown occurs sharply within this range; operation above 9.56 V risks exceeding its 200 mW power limit unless current is strictly limited by external series resistance.
Is this part suitable for use in automotive applications?
Yes - it is qualified for –65 °C to +150 °C operating temperature and meets AEC-Q200 stress test requirements for passive components. Its SOD-323 package and lead-free/halogen-free construction align with automotive electronics manufacturing standards.
How does its 10 Ω zener impedance affect circuit performance?
A 10 Ω dynamic impedance at 20 mA means output voltage changes only ~10 mV per 1 mA load variation - enabling stable reference generation in low-current analog circuits like sensor biasing and comparator thresholds without additional buffering.
Can this Zener be used in place of a 9 V battery replacement circuit?
No - it is not designed for sustained high-current regulation. At 200 mW max dissipation, continuous current must remain below ~22 mA at 9.1 V. It serves best as a precision clamp or reference, not a primary power source replacement.
MMSZ5239BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 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
MMSZ5239BS-7-F FAQ
1.How can I place an order for MMSZ5239BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5239BS-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 MMSZ5239BS-7-F reliable?
The price and inventory of MMSZ5239BS-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 MMSZ5239BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5239BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5239BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5239BS-7-F?
MMSZ5239BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5239BS-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 MMSZ5239BS-7-F?
For technical support, including MMSZ5239BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5239BS-7-F requirements.
6.How does Aetrix verify that MMSZ5239BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5239BS-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 MMSZ5239BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5239BS-7-F?
All MMSZ5239BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5239BS-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 MMSZ5239BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5239BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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