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Diodes Incorporated MMBZ5231BW-7
- Part No.:
- MMBZ5231BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5231BW-7.pdf
- Description:
- DIODE ZENER 5.1V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:1,629
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Product details
Overview
MMBZ5231BW-7 from Diodes Incorporated is a 5.1 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±5% zener voltage tolerance at 20 mA test current, with 17 Ω dynamic impedance and ≤5 μA reverse leakage at 2.0 V, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the MMBZ5231BW-7 datasheet, MMBZ5231BW-7 pinout, MMBZ5231BW-7 application, or MMBZ5231BW-7 equivalent, key selection criteria include nominal zener voltage (5.1 V), power rating (200 mW), zener impedance (17 Ω @ 20 mA), thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 5.1 V nominal zener voltage is specified at 20 mA test current, with tight 4.85–5.36 V range and low 17 Ω impedance ensuring minimal voltage deviation during transient current changes.
Designed for surface-mount assembly on FR4 PCBs with recommended pad layout, it features matte tin-plated Alloy 42 leads, moisture sensitivity level 1, and UL 94V-0 molded plastic case - enabling robust performance in space-constrained industrial and automotive control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 5.1 V - Stable reference voltage at 20 mA, suitable for 5 V rail clamping and ADC reference stabilization |
| Zener Voltage Range | 4.85–5.36 V - Ensures guaranteed regulation within ±5% across production lot and temperature |
| Power Dissipation | 200 mW - Limits maximum continuous dissipation on standard FR4 board without heatsinking |
| Zener Impedance | 17 Ω @ 20 mA - Low dynamic resistance preserves voltage accuracy under load variation |
| Reverse Leakage Current | ≤5 μA @ 2.0 V - Minimizes standby power loss in battery-powered sensor nodes |
| Thermal Resistance | 625 °C/W - Defines junction-to-ambient temperature rise per watt, critical for thermal derating above 25°C |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including engine control and body electronics |
Pinout & Package
Package: SOT323 - ultra-small 3-pin surface-mount package (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node; reverse-biased during regulation operation |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; defines regulated output voltage relative to anode |
| Case / Heat Sink (Pin 3) | Internal die connection | Electrically tied to cathode; provides minor thermal relief but not isolated |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability, including temperature cycling and humidity testing |
| SOT323 footprint | Enables high-density PCB layouts in compact consumer and industrial modules |
| 200 mW power rating | Supports regulation in low-current signal conditioning paths without external heat sinking |
| 17 Ω zener impedance | Delivers <±25 mV output shift under ±1 mA load change, improving reference stability |
| Moisture Sensitivity Level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing overhead |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit SAR ADCs in temperature and pressure transducers. IC Role / Device Role / Timing Role: Zener diode providing precise 5.1 V shunt reference for analog front-end biasing. Use Value: Maintains ADC full-scale accuracy within ±0.5 LSB by limiting reference drift to <10 mV over −40°C to +125°C. | Use Scenario: Overvoltage clamp on LIN bus interface supply rail in door module ECUs. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting 5 V regulator input from load dump spikes. Use Value: Clamps >15 V transients to ≤5.6 V within 100 ns, preventing downstream IC latch-up. |
| USB-C Power Negotiation Circuit | Smart Home Motion Detector |
Use Scenario: Voltage reference for CC line voltage divider in USB PD sink detection circuitry. IC Role / Device Role / Timing Role: Precision shunt regulator establishing accurate 0.8–1.2 V threshold for CC logic-level interpretation. Use Value: Enables reliable PD contract initiation by holding reference error <±1.2% across 0–70°C ambient. | Use Scenario: Supply rail stabilization for PIR sensor amplifier and microcontroller reset circuit. IC Role / Device Role / Timing Role: Low-leakage (≤5 μA) zener maintaining clean 3.3 V LDO input under battery discharge. Use Value: Extends shelf life to >2 years by minimizing quiescent current draw in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1 | Same 5.1 V nominal, 350 mW rating, SOT23 package, 60 Ω zener impedance | Higher power handling but larger footprint and higher impedance reduces regulation precision | Select when higher surge energy absorption is required and board area permits SOT23 |
| MMSZ5231BS | Same 5.1 V, 350 mW, SOD-123 package, 17 Ω impedance, AEC-Q101 qualified | Larger package improves thermal margin but occupies ~2.5× more PCB area than SOT323 | Prefer for designs needing enhanced thermal robustness where miniaturization is secondary |
Compared with BZX84-C5V1 and MMSZ5231BS, MMBZ5231BW-7 offers optimal balance of miniaturization (SOT323), low impedance (17 Ω), and automotive qualification - making it ideal for space- and precision-critical embedded systems where thermal load remains below 200 mW.
Availability
MMBZ5231BW-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and USB-C power negotiation circuits requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5231BW-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, specializing in high-reliability components for automotive, industrial, and consumer markets.
The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment embedded systems.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The MMBZ5231BW-7 has a nominal zener voltage of 5.1 V, with a guaranteed breakdown range of 4.85 V to 5.36 V at 20 mA test current. It is not rated for reverse blocking above its zener voltage - operation beyond 5.36 V initiates controlled breakdown, not catastrophic failure, provided power dissipation stays within 200 mW limits.
Is this device suitable for use in automotive applications?
Yes - MMBZ5231BW-7 is explicitly qualified to AEC-Q101 standards, covering stress tests such as temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. It is approved for use in non-safety-critical automotive subsystems including body electronics, lighting controls, and infotainment power rails.
How does the SOT323 package affect thermal performance?
The SOT323 package delivers a junction-to-ambient thermal resistance of 625 °C/W on standard FR4 PCBs with recommended pad layout. This means a 200 mW dissipation causes ~125°C junction rise above ambient - requiring derating above +25°C ambient per Figure 1 in the datasheet, especially in enclosed enclosures or stacked boards.
Can this Zener diode replace a 5 V linear regulator in low-current applications?
No - it functions only as a shunt regulator, requiring a series current-limiting resistor to set operating point. Unlike a 3-terminal linear regulator, it cannot source load current; it sinks excess current to maintain voltage. It is appropriate for reference generation or clamping, not active voltage regulation for variable loads exceeding 1–2 mA.
MMBZ5231BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ5231BW-7 FAQ
1.How can I place an order for MMBZ5231BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231BW-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 MMBZ5231BW-7 reliable?
The price and inventory of MMBZ5231BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5231BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5231BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231BW-7?
MMBZ5231BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231BW-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 MMBZ5231BW-7?
For technical support, including MMBZ5231BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231BW-7 requirements.
6.How does Aetrix verify that MMBZ5231BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5231BW-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 MMBZ5231BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5231BW-7?
All MMBZ5231BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231BW-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 MMBZ5231BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5231BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5231BW-7 Tags
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Diodes Incorporated
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