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Diodes Incorporated MMBZ5237B-7
- Part No.:
- MMBZ5237B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237B-7.pdf
- Description:
- DIODE ZENER 8.2V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,292
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Product details
Overview
MMBZ5237B-7 from Diodes Incorporated is a 8.2V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and reference applications at IZT = 20mA with ZZT = 8Ω and VR = 6.5V @ IR = 3.0µA. It operates across –65°C to +150°C and is qualified to JEDEC high-reliability standards for industrial and automotive-grade PCBs.
For engineers reviewing the MMBZ5237B-7 datasheet, MMBZ5237B-7 pinout, MMBZ5237B-7 application, or MMBZ5237B-7 equivalent, this part serves as a low-power, RoHS-compliant voltage clamp in power supply feedback loops, overvoltage protection circuits, and analog reference design where tight Zener tolerance (±5%), low dynamic impedance, and thermal stability are critical.
Technical Context
This Zener diode uses planar die construction to ensure stable breakdown characteristics and low leakage under reverse bias. Its 8.2V nominal Zener voltage is specified at 20mA test current with ±5% tolerance (7.79–8.61V), and exhibits 8Ω dynamic impedance at IZT, enabling accurate regulation in low-current reference paths.
Thermal resistance of 357°C/W (junction-to-ambient, FR-4 board) and full operation from –65°C to +150°C support use in thermally constrained environments. The device is fully lead-free, halogen- and antimony-free ("Green"), and compliant with RoHS 3 (2015/863/EU).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2V nominal, 7.79–8.61V range at IZT = 20mA - ensures precise clamping in 8V-class reference designs |
| Power Dissipation (PD) | 350mW on FR-4 PCB - defines maximum continuous DC power handling without derating below 25°C |
| Zener Impedance (ZZT) | 8Ω at IZT = 20mA - enables low-voltage deviation under load transients in feedback networks |
| Reverse Leakage (IR) | 3.0µA max at VR = 6.5V - guarantees minimal error current in high-impedance reference nodes |
| Operating Temperature | –65°C to +150°C - supports deployment in under-hood automotive and industrial control environments |
| Package | SOT23 - surface-mount footprint compatible with automated assembly and space-constrained PCB layouts |
| RoHS Compliance | Fully compliant per 2015/863/EU; halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets global environmental mandates |
Pinout & Package
Package: SOT23 - 3-terminal plastic molded case with matte tin-plated Alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground or lower-potential node in reverse-biased Zener configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 8.2V reference when reverse-biased; connects to feedback point or clamp rail |
| No-connect (Pin 3) | Internal die attachment / mechanical support | Not electrically connected; serves structural role in SOT23 mold compound; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term parametric stability under thermal cycling |
| 350mW dissipation on FR-4 | Enables direct integration into standard PCBs without heatsinking in low-power regulation stages |
| JEDEC high-reliability qualification | Validates robustness for mission-critical industrial and AEC-Q–aligned automotive subsystems |
| Lead-free & "Green" molding | Eliminates hazardous substances while maintaining UL 94V-0 flammability rating and solderability |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost converters using TL431-like topology. IC Role / Device Role: Precision shunt reference providing stable 8.2V threshold to optocoupler input. Use Value: Maintains ±1% output accuracy across line/load variations due to low ZZT and tight VZ tolerance. |
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 6.5V. IC Role / Device Role: Low-leakage Zener clamp limiting voltage to safe levels during ESD or inductive kick events. Use Value: Limits clamping voltage to ≤8.61V with <3µA standby current, minimizing interference with signal integrity. |
| Temperature-Stable Reference | Low-Power Sensor Biasing |
|
Use Scenario: Generating fixed bias for analog front-end amplifiers in battery-powered sensor nodes. IC Role / Device Role: Stable 8.2V reference source for ADC reference dividers or op-amp offset calibration. Use Value: Delivers <±0.5% drift over –40°C to +85°C, reducing need for active temperature compensation. |
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) in HVAC control modules. IC Role / Device Role: Low-noise, low-drift Zener supplying constant current via series resistor to RTD element. Use Value: Enables <0.1% measurement linearity by eliminating supply-induced gain error in ratiometric sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2 | Same 8.2V nominal, but 300mW PD, higher ZZT = 15Ω, wider VZ tolerance (±6%) | Suitable for cost-sensitive consumer electronics where tighter regulation is not required | Select when budget constraints outweigh need for lowest impedance and tightest tolerance |
| MM3Z8V2 | Same 8.2V, 200mW PD, ZZT = 10Ω, SOD-323 package (smaller footprint, higher θJA) | Better for ultra-dense layouts but limited to lower power and reduced thermal margin | Choose for space-constrained portable devices accepting reduced power headroom |
Compared with BZX84-C8V2 and MM3Z8V2, MMBZ5237B-7 delivers superior regulation accuracy (±5% vs ±6%), lower dynamic impedance (8Ω vs 15Ω/10Ω), and higher power capability (350mW), making it optimal for industrial feedback and precision clamp designs requiring thermal resilience and long-term stability.
Availability
MMBZ5237B-7 is available at Aetrix Electronics and suitable for power supply feedback loops, overvoltage protection circuits, and temperature-stable reference designs requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for MMBZ5237B-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-efficiency power management, signal integrity, and protection solutions.
The MMBZ52xxB series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and clamping in space-constrained, high-reliability industrial and automotive applications.
FAQ
What is the maximum reverse leakage current for MMBZ5237B-7 at 6.5V?
The maximum reverse leakage current (IR) is 3.0µA at VR = 6.5V, measured at TA = +25°C. This low leakage ensures minimal error current in high-impedance reference circuits and preserves accuracy in battery-powered systems where standby current matters.
Can MMBZ5237B-7 be used in automotive applications?
Yes - MMBZ5237B-7 is JEDEC-qualified for high reliability and manufactured in IATF 16949-certified facilities. For AEC-Q200-compliant automotive use, Diodes offers the Q-suffix variant (e.g., MMBZ5237BQ-7-F), which undergoes additional stress testing and PPAP documentation.
What is the thermal resistance (RθJA) of MMBZ5237B-7 on FR-4 PCB?
The junction-to-ambient thermal resistance is 357°C/W when mounted on FR-4 PCB with Diodes' recommended pad layout. This value assumes standard copper pour and no thermal vias; actual RθJA improves with enhanced thermal land design or metal-core substrates.
How does the SOT23 package affect soldering and rework?
The SOT23 package uses matte tin finish on Alloy 42 leads, ensuring compatibility with standard SnPb and lead-free reflow profiles per J-STD-020. Its moisture sensitivity level 1 allows floor life unlimited at ≤30°C/60% RH, simplifying handling and eliminating bake requirements before assembly.
MMBZ5237B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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:
- SOT-23-3
MMBZ5237B-7 FAQ
1.How can I place an order for MMBZ5237B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237B-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 MMBZ5237B-7 reliable?
The price and inventory of MMBZ5237B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5237B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237B-7?
MMBZ5237B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237B-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 MMBZ5237B-7?
For technical support, including MMBZ5237B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237B-7 requirements.
6.How does Aetrix verify that MMBZ5237B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5237B-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 MMBZ5237B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5237B-7?
All MMBZ5237B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237B-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 MMBZ5237B-7 part is unused and in its original packaging.
Return procedure for MMBZ5237B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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