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Diodes Incorporated MMSZ5238B-7-F
- Part No.:
- MMSZ5238B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5238B-7-F.pdf
- Description:
- DIODE ZENER 8.7V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:13,635
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Product details
Overview
MMSZ5238B-7-F from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 8.7V (±5%), 20mA test current, 8Ω maximum zener impedance at 20mA, 3.0µA maximum reverse leakage at 6.5V, and SOD123 package. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the MMSZ5238B-7-F datasheet, MMSZ5238B-7-F pinout, MMSZ5238B-7-F application, or MMSZ5238B-7-F equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at operating current, thermal derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load and temperature conditions. Its 8.7V nominal zener voltage exhibits a positive temperature coefficient typical of mid-voltage Zeners (≈+0.06%/°C), and it delivers stable regulation with ≤8Ω dynamic impedance at IZT = 20mA.
The device is rated for 370mW power dissipation at TA = +25°C and derates linearly to 500mW at TL = +75°C, with RθJA = 338°C/W on FR-4 PCB. Its SOD123 package supports automated pick-and-place assembly and meets AEC-Q101 for high-reliability automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7V nominal, 8.27–9.14V range at 20mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 370mW at TA = +25°C - sets maximum continuous power handling on standard PCB layout |
| Zener Impedance (ZZT) | ≤8Ω at IZT = 20mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | ≤3.0µA at VR = 6.5V - ensures minimal standby current in voltage-sense or clamping paths |
| Thermal Resistance (RθJA) | 338°C/W - quantifies junction-to-ambient temperature rise per watt dissipated |
| Operating Temperature | −65°C to +150°C - enables use in extended-temperature industrial and automotive environments |
| AEC-Q101 Qualified | Yes - confirms reliability validation for automotive electronics per stress-test requirements |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65mm × 1.55mm × 1.05mm (L × W × H); weight ≈ 0.01g; RoHS-compliant, halogen-free, lead-free plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage regulation output | Connected to regulated node; voltage measured from cathode to anode during operation |
Key Features
| Feature | Design Value |
|---|---|
| 500mW Power Rating at Lead Temperature | Enables higher transient power handling than standard 370mW rating when mounted on thermally enhanced pads |
| AEC-Q101 Qualification | Validated for automotive under-hood and infotainment systems requiring proven reliability under thermal cycling and humidity stress |
| SOD123 Package with Matte Tin Plating | Ensures consistent solderability per MIL-STD-202 and compatibility with lead-free reflow profiles |
| Halogen- and Antimony-Free "Green" Compound | Meets strict environmental compliance (Br+Cl <1500ppm, Sb <1000ppm) without compromising molding integrity or flammability rating (UL 94V-0) |
Applications
| Automotive Cabin Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring HVAC actuator position. IC Role / Device Role / Timing Role: Zener diode provides stable 8.7V reference to bias op-amp signal chain and set ADC full-scale range. Use Value: Tight 5% VZ tolerance and low 8Ω ZZT ensure <±0.5% reference drift over temperature and load variation. | Use Scenario: Clamping transient overvoltage on 12V supply rail feeding analog front-end of pressure sensor. IC Role / Device Role / Timing Role: Acts as shunt protector to limit rail voltage to 9.14V peak during load-dump events. Use Value: 370mW continuous rating and 500mW short-duration capability absorb energy without failure under ISO 7637-2 pulse 5a stress. |
| Consumer USB-C Power Adapter Feedback | Medical Portable Diagnostic Device |
Use Scenario: Providing precise voltage reference for optocoupler feedback loop in isolated flyback converter. IC Role / Device Role / Timing Role: Sets secondary-side regulation threshold to control primary-side PWM duty cycle via isolation barrier. Use Value: Low 3.0µA leakage at 6.5V minimizes error current injection into feedback divider, improving ±1% output accuracy. | Use Scenario: Stabilizing bias voltage for low-noise instrumentation amplifier in battery-powered ECG front-end. IC Role / Device Role / Timing Role: Supplies clean, low-drift reference to amplifier gain-setting network and ADC reference input. Use Value: AEC-Q101 qualification and −65°C to +150°C operating range support long-term stability in clinical and field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C8V2 | 8.2V nominal, ±5%, 300mW PD, SOD323 package | Lower power rating and smaller footprint; higher ZZT (15Ω) | Preferred where board space is constrained but 8.2V regulation suffices and thermal margin is adequate |
| MMSZ4689T1G | 8.7V nominal, ±5%, 500mW PD, SOD123, but no AEC-Q101 qualification | Same electrical specs but lacks automotive reliability validation | Acceptable for commercial-grade power supplies where AEC-Q101 is not mandated |
Compared with BZX584C8V2 and MMSZ4689T1G, MMSZ5238B-7-F uniquely combines 8.7V regulation, 500mW lead-temperature rating, and AEC-Q101 qualification in the widely adopted SOD123 footprint-making it optimal for automotive and industrial designs demanding both precision and proven reliability.
Availability
MMSZ5238B-7-F is available at Aetrix Electronics and suitable for automotive cabin control modules, industrial sensor signal conditioning circuits, and consumer USB-C power adapter feedback loops requiring stable component supply and traceable sourcing.
Supply support for MMSZ5238B-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, energy-efficient components for automotive, industrial, and consumer markets.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-volume voltage regulation and protection in space-constrained surface-mount applications.
FAQ
What is the maximum reverse leakage current for MMSZ5238B-7-F at 6.5V?
The maximum reverse leakage current is 3.0µA at VR = 6.5V and TA = +25°C, as specified in the Electrical Characteristics table. This value ensures minimal current draw in voltage-sense networks and maintains accuracy in precision reference applications.
Is MMSZ5238B-7-F suitable for automotive applications?
Yes - it is explicitly qualified to AEC-Q101 standards, including stress tests for temperature cycling, humidity, and mechanical shock. Its SOD123 package and green molding compound meet automotive environmental and reliability requirements.
How does the SOD123 package affect thermal performance?
Mounted on FR-4 with a 1-inch copper pad, the SOD123 package achieves RθJA = 338°C/W. Derating begins at +25°C ambient, reaching full 500mW capability only at +75°C lead temperature - design must account for PCB copper area and airflow.
What is the zener impedance at 1mA test current?
Zener impedance at IZK = 0.25mA is ≤600Ω, per the datasheet's ZZK specification. At 1mA - between knee and nominal test current - impedance is not directly specified but falls within the 600–8Ω range, decreasing nonlinearly as current increases toward 20mA.
MMSZ5238B-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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
MMSZ5238B-7-F FAQ
1.How can I place an order for MMSZ5238B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5238B-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 MMSZ5238B-7-F reliable?
The price and inventory of MMSZ5238B-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 MMSZ5238B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5238B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5238B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5238B-7-F?
MMSZ5238B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5238B-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 MMSZ5238B-7-F?
For technical support, including MMSZ5238B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5238B-7-F requirements.
6.How does Aetrix verify that MMSZ5238B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5238B-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 MMSZ5238B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5238B-7-F?
All MMSZ5238B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5238B-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 MMSZ5238B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5238B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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