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Diodes Incorporated MMSZ5237BS-7
- Part No.:
- MMSZ5237BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5237BS-7.pdf
- Description:
- DIODE ZENER 8.2V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,037
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Product details
Overview
MMSZ5237BS-7 from Diodes Incorporated is a surface-mount 8.2 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, with 8 Ω dynamic impedance at 20 mA test current and maximum 3.0 µA reverse leakage at 6.5 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5237BS-7 datasheet, MMSZ5237BS-7 pinout, MMSZ5237BS-7 application, or MMSZ5237BS-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (625 °C/W), cathode-band polarity marking, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage.
Designed for general-purpose voltage reference and overvoltage protection, it delivers 8.2 V regulation with ±5% tolerance (7.79–8.61 V) at 20 mA, and exhibits 500 Ω maximum Zener impedance at knee current (0.25 mA), supporting accurate low-current biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 8.2 V - precise DC reference voltage at 20 mA test current |
| Zener Voltage Range | 7.79–8.61 V - ±5% tolerance band defining usable regulation window |
| Power Dissipation | 200 mW - maximum continuous power at 25°C ambient, derates linearly above 25°C |
| Zener Impedance | 8 Ω @ 20 mA - low dynamic resistance enabling stable regulation under load variation |
| Reverse Leakage Current | 3.0 µA @ 6.5 V - minimal off-state current ensuring low quiescent power loss |
| Thermal Resistance | 625 °C/W - junction-to-ambient value dictating temperature rise per watt dissipated |
| Forward Voltage | 0.9 V @ 10 mA - forward conduction threshold for polarity verification and ESD path design |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.3–2.7 mm length × 1.2–1.4 mm width × 0.25–0.35 mm height), UL 94V-0 rated, moisture sensitivity level 1, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during normal Zener operation; used for polarity check and ESD clamping in forward bias |
| Cathode | Reverse breakdown terminal | Marked with band; connected to higher-potential node to enable Zener regulation; defines voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage distribution and repeatable breakdown characteristics across production lots |
| SOD-323 package | Enables high-density PCB layout and compatibility with standard 0805-footprint reflow profiles |
| Totally lead-free & RoHS compliant | Meets EU Directive 2011/65/EU without added lead, antimony, or halogen compounds |
| Automated assembly suitability | Matte tin-plated terminals and defined pad layout (AP02001) support reliable pick-and-place and solder joint formation |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 8.2 V reference for LDO feedback networks or ADC voltage references in battery-powered sensors. IC Role / Device Role / Timing Role: Voltage reference element establishing regulated bias point for analog signal conditioning circuitry. Use Value: Maintains ±5% output accuracy across -65°C to +150°C, minimizing drift-induced measurement error. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events in industrial control inputs. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground when input exceeds 8.2 V. Use Value: Limits peak voltage to ≤8.61 V with <3 µA leakage below clamp threshold, preserving signal integrity. |
| Current Source Bias | Signal Level Translation |
|
Use Scenario: Setting bias current for op-amp input stages or LED driver base resistors in portable audio amplifiers. IC Role / Device Role / Timing Role: Constant-voltage element defining emitter/base voltage drop in discrete transistor bias networks. Use Value: Delivers stable 8.2 V with 8 Ω dynamic impedance, reducing current variation under supply ripple. |
Use Scenario: Translating 3.3 V logic signals to 8.2 V interface levels for legacy sensor communication lines. IC Role / Device Role / Timing Role: Passive level-shifting node using Zener forward drop (0.9 V) and reverse breakdown (8.2 V). Use Value: Enables bidirectional translation without active components, leveraging low 0.9 V VF for return-path margin. |
Availability
MMSZ5237BS-7 is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and low-power biasing applications requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5237BS-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, space-constrained voltage regulation and protection in high-volume SMT applications.
FAQ
What is the Zener voltage tolerance for MMSZ5237BS-7?
The MMSZ5237BS-7 has a nominal Zener voltage of 8.2 V with a guaranteed range of 7.79 V to 8.61 V at 20 mA test current, corresponding to ±5% tolerance as specified in DS31038 Rev. 13-2. This tolerance remains valid across the full operating temperature range of –65°C to +150°C.
Can MMSZ5237BS-7 be used in place of a 5.1 V Zener diode?
No - MMSZ5237BS-7 is specifically rated for 8.2 V nominal Zener voltage and is not interchangeable with 5.1 V devices like MMSZ5231BS. Substituting mismatched Zener voltages risks incorrect biasing, overvoltage exposure, or failure to clamp at intended thresholds.
What is the maximum reverse leakage current specification?
The maximum reverse leakage current is 3.0 µA at VR = 6.5 V, measured at 25°C ambient temperature. This value reflects worst-case off-state conduction and is critical for low-power standby circuits where quiescent current must remain below 5 µA.
Does MMSZ5237BS-7 require heatsinking in typical applications?
No - with a 200 mW power rating and 625 °C/W thermal resistance, the device remains within safe junction temperature limits (<150°C) at room ambient even at full rated power, provided it is mounted on standard FR-4 PCB with recommended AP02001 pad layout and no additional thermal stress.
MMSZ5237BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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-323
MMSZ5237BS-7 FAQ
1.How can I place an order for MMSZ5237BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5237BS-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 MMSZ5237BS-7 reliable?
The price and inventory of MMSZ5237BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5237BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5237BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5237BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5237BS-7?
MMSZ5237BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5237BS-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 MMSZ5237BS-7?
For technical support, including MMSZ5237BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5237BS-7 requirements.
6.How does Aetrix verify that MMSZ5237BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5237BS-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 MMSZ5237BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5237BS-7?
All MMSZ5237BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5237BS-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 MMSZ5237BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5237BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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