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Diodes Incorporated MMSZ5231BS-7
- Part No.:
- MMSZ5231BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5231BS-7.pdf
- Description:
- DIODE ZENER 5.1V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,122
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Product details
Overview
MMSZ5231BS-7 from Diodes Incorporated is a surface-mount silicon Zener diode with a nominal zener voltage of 5.1 V, ±5% tolerance (4.85–5.36 V), 200 mW power dissipation, and 17 Ω dynamic impedance at 20 mA test current. It operates across –65 °C to +150 °C and serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5231BS-7 datasheet, MMSZ5231BS-7 pinout, MMSZ5231BS-7 application, or MMSZ5231BS-7 equivalent, key selection factors include its SOD-323 package footprint, low leakage (<5 µA at 2.0 V reverse bias), stable zener knee at 0.25 mA, and compatibility with automated reflow assembly on FR-4 PCBs.
Technical Context
This Zener diode uses planar die construction for consistent breakdown characteristics and low thermal resistance (625 °C/W junction-to-ambient). Its 5.1 V regulation point targets mid-range reference needs where 3.3 V and 6.2 V devices are unsuitable.
The device exhibits 1600 Ω maximum zener impedance at 0.25 mA (ZZK), enabling stable operation under light-load conditions, and maintains <5 µA reverse leakage at VR = 2.0 V - critical for battery-powered sensor bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, 4.85–5.36 V range at IZT = 20 mA - ensures tight regulation in 5 V rail monitoring and ADC reference buffering. |
| Power Dissipation (PD) | 200 mW at TA = 25 °C - supports continuous operation in compact PCB layouts without forced cooling. |
| Zener Impedance (ZZT) | 17 Ω at IZT = 20 mA - minimizes output voltage variation under load transients in feedback loops. |
| Reverse Leakage (IR) | ≤5.0 µA at VR = 2.0 V - preserves accuracy in high-impedance voltage divider interfaces. |
| Thermal Resistance (RθJA) | 625 °C/W - requires minimal copper area (per AP02001 pad layout) for safe derating up to 125 °C ambient. |
| Operating Temperature | –65 °C to +150 °C - qualified for under-hood automotive sensors and industrial control modules. |
Pinout & Package
Package: SOD-323 - ultra-compact 2-pin surface-mount plastic case (2.3–2.7 mm length × 1.2–1.4 mm width × 0.25–0.35 mm height), UL 94V-0 rated, lead-free matte tin plating, cathode band marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference polarity for reverse-biased operation. |
| Cathode | Zener breakdown terminal / Voltage regulation output | Connected to regulated node (e.g., feedback divider tap); supplies stable 5.1 V when reverse-biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable zener voltage distribution and low parametric drift over temperature and life. |
| SOD-323 package footprint | Enables high-density placement in space-constrained IoT sensor nodes and portable medical monitors. |
| Lead-free & RoHS-compliant | Meets IPC-J-STD-020D Level 1 moisture sensitivity and EU Directive 2011/65/EU requirements. |
| Low leakage at low reverse bias | 5.0 µA max at 2.0 V enables use in micropower wake-up circuits without compromising standby current. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
Use Scenario: Stabilizing bias voltage for bridge amplifier inputs in pressure transducers operating from 12 V supply rails. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 5.1 V node for op-amp common-mode setting and ADC reference scaling. Use Value: Maintains ±0.25% full-scale linearity over –40 °C to +85 °C due to low tempco and 17 Ω ZZT. |
Use Scenario: Generating precise 5.1 V threshold for CC logic detection in USB-C port controllers. IC Role / Device Role / Timing Role: Reverse-biased clamping element defining VCONN detection level in Type-C configuration channel interface. Use Value: Delivers sub-10 µA leakage at 2.0 V to avoid false CC pull-down interpretation during hot-plug events. |
| Automotive Cabin Control Panel | Low-Power Wearable Health Monitor |
Use Scenario: Regulating microcontroller I/O voltage in HVAC control modules exposed to 12 V battery fluctuations. IC Role / Device Role / Timing Role: Shunt regulator maintaining stable 5.1 V for GPIO protection and level-shifting between MCU and display driver. Use Value: Withstands 150 °C junction temperature and sustains 200 mW dissipation without derating in sealed enclosures. |
Use Scenario: Providing reference voltage for ECG front-end instrumentation amplifiers powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-current zener reference (0.25 mA knee) establishing accurate gain-setting node in ultra-low-power analog chain. Use Value: 1600 Ω ZZK at 0.25 mA ensures stable regulation even at 1 µA quiescent current, extending battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C5V1 | Same 5.1 V nominal, but SOD-523 package (smaller footprint), 300 mW PD, higher leakage (10 µA @ 2 V) | Better suited for space-limited RF modules where thermal margin > power density matters | Select if board real estate is constrained and 10 µA leakage is acceptable in bias network. |
| MMBZ5231BS | Identical electrical specs, but SOT-23 package (larger, 3-pin, anode/cathode/NC), 350 mW PD | Preferred for manual prototyping or high-reliability industrial controls requiring mechanical robustness | Choose when hand-soldering or vibration resistance outweighs size constraints. |
Compared with BZX584C5V1 and MMBZ5231BS, MMSZ5231BS-7 offers optimal balance of miniaturization (SOD-323), low leakage, and compatibility with high-volume reflow processes - making it ideal for consumer electronics and compact embedded systems where footprint and assembly yield are critical.
Availability
MMSZ5231BS-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference design, and automotive cabin control panel production requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5231BS-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.
MMSZ5231BS-7 belongs to the MMSZ52xxBS series of general-purpose Zener diodes engineered for cost-sensitive, high-volume applications demanding reliable voltage regulation in compact SMD packages.
FAQ
What is the maximum reverse voltage (VR) at which leakage remains ≤5 µA?
The datasheet specifies that reverse leakage current (IR) is ≤5.0 µA at VR = 2.0 V. This value is measured under standard test conditions (TA = 25 °C) and defines the upper limit of usable reverse bias before leakage begins increasing nonlinearly - critical for low-power bias networks.
Can MMSZ5231BS-7 be used in place of a 5 V LDO for power regulation?
No - this is a shunt Zener diode, not a series regulator. It requires a current-limiting resistor and dissipates excess power as heat. It provides voltage reference or overvoltage clamping, not regulated output current. For active 5 V regulation, a dedicated LDO like AP2112K-5.0 must be used.
Is the SOD-323 package compatible with standard reflow profiles for lead-free soldering?
Yes - the device is fully RoHS-compliant with matte tin plating and rated for peak reflow temperatures up to 260 °C per J-STD-020D Level 1. Its moisture sensitivity level (MSL 1) allows unlimited floor life before reflow, eliminating bake requirements.
How does zener impedance change below the 20 mA test current?
Zener impedance rises significantly at lower currents: maximum ZZK = 1600 Ω at IZK = 0.25 mA. This reflects increased dynamic resistance near the knee voltage and must be accounted for in low-current reference designs - e.g., using parallel capacitance to stabilize output.
MMSZ5231BS-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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
MMSZ5231BS-7 FAQ
1.How can I place an order for MMSZ5231BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5231BS-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 MMSZ5231BS-7 reliable?
The price and inventory of MMSZ5231BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5231BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5231BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5231BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5231BS-7?
MMSZ5231BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5231BS-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 MMSZ5231BS-7?
For technical support, including MMSZ5231BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5231BS-7 requirements.
6.How does Aetrix verify that MMSZ5231BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5231BS-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 MMSZ5231BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5231BS-7?
All MMSZ5231BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5231BS-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 MMSZ5231BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5231BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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