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Diodes Incorporated MMSZ5239B-7
- Part No.:
- MMSZ5239B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5239B-7.pdf
- Description:
- DIODE ZENER 9.1V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,119
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Product details
Overview
MMSZ5239B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 9.1V (8.65–9.56V range), 20mA test current, and 10Ω zener impedance at 20mA. It operates across –65°C to +150°C, features SOD123 package, cathode band polarity, and is qualified to AEC-Q101 for automotive reliability.
For engineers reviewing the MMSZ5239B-7 datasheet, MMSZ5239B-7 pinout, MMSZ5239B-7 application, or MMSZ5239B-7 equivalent, this part serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback paths, and ESD-protected sensor interfaces where stable 9.1V regulation under medium current is required.
Technical Context
This Zener diode functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its 9.1V nominal zener voltage is specified at 20mA test current, with maximum zener impedance of 10Ω at that condition and 600Ω at 0.25mA knee current - indicating sharp knee characteristics suitable for reference use.
Thermal performance is defined by 338°C/W junction-to-ambient thermal resistance on FR-4 PCB with 1-inch copper pad, and derating begins above +25°C ambient, reaching 500mW at +75°C lead temperature. The device uses matte tin-plated alloy 42 leadframe and green molding compound compliant with RoHS, halogen-free, and antimony-free requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 9.1 V - Stable regulation point for feedback loops and reference circuits |
| Zener Voltage Range | 8.65–9.56 V @ 20 mA - Ensures production yield and tolerance compliance |
| Zener Impedance | 10 Ω @ 20 mA - Low dynamic resistance enables tight voltage regulation under load variation |
| Power Dissipation | 370 mW @ TA = +25°C - Maximum continuous power on standard PCB layout |
| Reverse Leakage Current | 3.0 µA @ VR = 7.0 V - Minimal error contribution in high-impedance bias networks |
| Operating Temperature | –65°C to +150°C - Supports automotive under-hood and industrial control environments |
| Package | SOD123 - Standardized 2-pin surface-mount footprint compatible with automated placement |
Pinout & Package
The MMSZ5239B-7 is housed in a SOD123 plastic package with cathode band marking. Dimensions: 1.55 mm width × 2.65 mm length × 1.05 mm height; weight ≈ 0.01 g. Moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in regulation circuit; forms reference ground return path |
| Cathode | Reverse-biased breakdown terminal / Zener output node | Provides regulated 9.1V output when biased through current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control and body electronics |
| Green compound packaging | Halogen- and antimony-free molding compound meeting <900 ppm Br/Cl and <1000 ppm Sb |
| Low zener impedance | 10 Ω at 20 mA ensures minimal output voltage shift with load current changes |
| Automated assembly compatibility | SOD123 footprint and matte tin plating support high-yield reflow soldering |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Feedback |
|---|---|
|
Use Scenario: Providing stable 9.1V bias to analog sensor signal conditioning circuits in engine control units. IC Role / Device Role / Timing Role: Voltage reference for op-amp input stages and ADC reference dividers. Use Value: Maintains ±0.5% reference stability over –40°C to +125°C, reducing calibration drift in emission-critical systems. |
Use Scenario: Setting output voltage in isolated flyback converter feedback network using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Precision shunt regulator establishing secondary-side voltage setpoint. Use Value: Enables compact, low-cost feedback path with 10Ω dynamic impedance improving transient response vs. higher-Z alternatives. |
| Consumer Device Overvoltage Clamp | Medical Instrument Reference |
|
Use Scenario: Clamping USB VBUS line transients in portable diagnostic devices during hot-plug events. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting downstream LDOs and microcontrollers. Use Value: 9.1V clamping threshold prevents damage while allowing normal 5V operation; 3.0µA leakage avoids battery drain. |
Use Scenario: Generating stable 9.1V reference for analog front-end gain calibration in portable ultrasound units. IC Role / Device Role / Timing Role: Low-drift voltage reference source for DAC/ADC offset trimming. Use Value: AEC-Q101 qualification ensures long-term parametric stability in field-deployed equipment with no derating needed. |
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 9.1V nominal, but 300mW rating and SOD323 package; 15Ω zener impedance @ 5mA | Lower power handling limits use in >10mA feedback paths; smaller footprint suits space-constrained layouts | Select when board area is critical and power dissipation remains below 250mW |
| MMBZ5239BS | Same electrical specs but SOT-23 package; 3-pin configuration with anode/cathode/common pinout | Requires different PCB layout and may introduce parasitic inductance in high-frequency clamp roles | Prefer for designs already using SOT-23 footprints or requiring dual-diode configurations |
Compared with BZX584C9V1 and MMBZ5239BS, the MMSZ5239B-7 offers superior power handling (370mW vs. 300mW) and lower zener impedance (10Ω vs. 15Ω), making it better suited for medium-current regulation where thermal margin and regulation accuracy are prioritized over footprint size.
Availability
MMSZ5239B-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply feedback, and consumer device overvoltage clamping requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for MMSZ5239B-7 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.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-sensitive, high-volume applications demanding AEC-Q101 reliability, green compliance, and consistent voltage regulation in compact SOD123 packages.
FAQ
What is the maximum continuous power dissipation for MMSZ5239B-7 at +75°C ambient?
The MMSZ5239B-7 supports 500mW power dissipation at TL = +75°C (lead temperature), per datasheet Figure 1. At TA = +25°C, its rated power is 370mW on FR-4 with 1-inch copper pad. Derating follows linear curve to zero at +150°C ambient.
Does MMSZ5239B-7 have a specified temperature coefficient?
Yes - Figure 6 shows typical temperature coefficient for MMSZ5239B-7 is approximately +0.06%/°C near 9.1V, derived from the MMSZ5227B–MMSZ5258B family curve. This positive TC means output voltage increases slightly with rising temperature, useful for compensating negative TC components.
Can MMSZ5239B-7 be used in place of a 9.1V Zener in a TL431-based feedback circuit?
Yes, but only as a direct replacement for basic shunt regulation. Unlike TL431, MMSZ5239B-7 lacks adjustable reference and gain; it provides fixed 9.1V regulation. Use it where simplicity and low cost outweigh need for programmability or tighter initial tolerance.
Is the SOD123 package of MMSZ5239B-7 compatible with standard reflow profiles?
Yes - the matte tin finish on alloy 42 leadframe meets MIL-STD-202 Method 208 solderability requirements. Its moisture sensitivity level is J-STD-020 Level 1, permitting unlimited floor life and compatibility with standard Pb-free reflow profiles without baking.
MMSZ5239B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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-123
MMSZ5239B-7 FAQ
1.How can I place an order for MMSZ5239B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5239B-7 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 MMSZ5239B-7 reliable?
The price and inventory of MMSZ5239B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5239B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5239B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5239B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5239B-7?
MMSZ5239B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5239B-7 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 MMSZ5239B-7?
For technical support, including MMSZ5239B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5239B-7 requirements.
6.How does Aetrix verify that MMSZ5239B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5239B-7 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 MMSZ5239B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5239B-7?
All MMSZ5239B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5239B-7, 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 MMSZ5239B-7 part is unused and in its original packaging.
Return procedure for MMSZ5239B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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