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Diodes Incorporated ZMM5237B-7
- Part No.:
- ZMM5237B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5237B-7.pdf
- Description:
- DIODE ZENER 8.2V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,580
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Product details
Overview
ZMM5237B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with nominal zener voltage 8.2V (±5% tolerance), 8.0Ω dynamic impedance at 20mA test current, and +0.062%/°C temperature coefficient. It uses a MiniMELF glass package for stable voltage reference in low-power analog circuits, including power supply feedback loops and overvoltage protection in industrial sensor interfaces.
For engineers reviewing the ZMM5237B-7 datasheet, ZMM5237B-7 pinout, ZMM5237B-7 application, or ZMM5237B-7 equivalent, key selection criteria include its 8.2V regulation accuracy, 500mW power rating under ambient conditions, MiniMELF thermal resistance of 300°C/W, and cathode-band polarity marking-critical for PCB layout verification and replacement in legacy designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across varying load and line conditions. Its 8.2V nominal zener voltage is specified at 20mA test current (IZT), with maximum zener impedance of 8.0Ω at IZT and 500Ω at knee current (IZK = 0.25mA).
The device exhibits a positive temperature coefficient of +0.062%/°C, indicating voltage increases with temperature-enabling compensation in temperature-sensitive references. Its MiniMELF DO-213AA package provides hermetic glass sealing and solderable terminals per MIL-STD-202, Method 208.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal, 7.79–8.61 V range at 20 mA - defines precision of voltage clamping or reference point |
| Power Dissipation (Pd) | 500 mW - sets maximum continuous DC or pulsed power handling at ambient temperature |
| Zener Impedance (ZZT) | 8.0 Ω at 20 mA - determines regulation stiffness under load transients |
| Reverse Current (IR) | 3.0 µA max at VR = 6.5 V - ensures low leakage in high-impedance bias networks |
| Temp. Coefficient (TC) | +0.062 %/°C - enables predictable drift compensation in temperature-critical references |
| Thermal Resistance (RJA) | 300 °C/W - defines junction-to-ambient thermal rise per watt, critical for derating above 25°C |
Pinout & Package
Package: MiniMELF (DO-213AA) - hermetically sealed glass cylindrical package, 3.3–3.7 mm length (A), 1.3–1.6 mm diameter (B), cathode band marking only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-bias operation | Connected to lower potential node when used as shunt regulator or clamp |
| Cathode | Zener breakdown terminal / high-voltage side in reverse-bias operation | Marked with band; connected to regulated output or protection node |
Key Features
| Feature | Design Value |
|---|---|
| Stable 8.2V reference | ±5% tolerance at 20mA ensures predictable clamping without external trimming |
| Low dynamic impedance | 8.0Ω at IZT minimizes output voltage variation under load changes |
| Positive tempco matching | +0.062%/°C allows pairing with negative-tempco components for compensated references |
| MiniMELF reliability | Hermetic glass construction supports long-term stability in harsh environments (-65°C to +175°C) |
Applications
| Industrial Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 8.2V threshold for TL431-like control loop. Use Value: Enables ±1% output regulation without trimming, leveraging tight 8.2V tolerance and low ZZT. |
Use Scenario: Clamping transient surges on 5V/12V rail inputs in PLC I/O modules. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting rail excursion to ≤8.61V during ESD or inductive kick events. Use Value: Prevents downstream IC damage with sub-µA leakage at 6.5V and fast response due to low capacitance. |
| Temperature-Compensated Reference | Low-Power Sensor Biasing |
Use Scenario: Generating stable bias for RTD or thermistor signal conditioning circuits. IC Role / Device Role / Timing Role: Primary voltage reference whose +0.062%/°C TC offsets NTC sensor drift. Use Value: Reduces system-level temperature error by >40% compared to uncompensated 8.2V references. |
Use Scenario: Providing excitation voltage to MEMS pressure sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-leakage (≤3.0 µA @ 6.5V) reference source minimizing quiescent current draw. Use Value: Extends battery life by limiting bias network current while maintaining 8.2V accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C8V2 (Vishay) | Same 8.2V nominal, but 5% tolerance, 10Ω ZZT @ 20mA, TO-204AA (DO-35) axial package | Higher thermal resistance (500°C/W) limits power handling in SMT layouts | Prefer for through-hole prototyping or legacy board rework where MiniMELF footprint unavailable |
| MMSZ5237B (ON Semiconductor) | Identical 8.2V/500mW spec, same MiniMELF package, but 10Ω ZZT @ 20mA and +0.065%/°C TC | Slightly higher impedance reduces regulation precision in high-dynamic-load scenarios | Acceptable drop-in for cost-sensitive production where ±0.3Ω ZZT difference is within system margin |
Compared with ZMM5237B-7, BZX55C8V2 offers axial compatibility but sacrifices thermal performance, while MMSZ5237B matches footprint and voltage but trades 2.0Ω higher impedance and +0.003%/°C higher tempco-both viable where those deltas fall within design tolerances.
Availability
ZMM5237B-7 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, temperature-compensated references, and low-power sensor biasing requiring stable component supply and long-lifecycle support.
Supply support for ZMM5237B-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, high-efficiency components for industrial, automotive, and computing markets.
The ZMM52xxB series targets precision voltage reference and protection applications in space-constrained SMT designs, emphasizing tight tolerance, stable tempco, and MiniMELF ruggedness for mission-critical analog functions.
FAQ
What is the maximum continuous reverse voltage (VR) that ZMM5237B-7 can withstand without breakdown?
ZMM5237B-7 is rated for 6.5V maximum reverse voltage (VR) before significant leakage occurs-this is the voltage at which IR is guaranteed ≤3.0 µA. Operation above this level risks uncontrolled conduction and thermal runaway unless current is strictly limited by external series resistance.
Can ZMM5237B-7 be used in place of a 7.5V Zener like ZMM5236B in a feedback circuit?
No-ZMM5237B-7 has a nominal 8.2V zener voltage versus 7.5V for ZMM5236B, resulting in ~9% higher regulation point. Substituting it would raise output voltage proportionally and may violate system specifications unless feedback resistor values are recalculated to compensate.
Does ZMM5237B-7 require heatsinking in standard PCB layouts?
No heatsink is required at room temperature with ≤500mW dissipation, as its MiniMELF package has RJA = 300°C/W. At 25°C ambient, junction temperature rises to 175°C at full power-within rated Tj limit. Derating is needed above 50°C ambient per Figure 1 in the datasheet.
Is the cathode band orientation consistent across all MiniMELF Zeners from Diodes Inc.?
Yes-the cathode band is always located at one end of the MiniMELF cylinder and corresponds to the marked terminal in all ZMM52xxB devices. This polarity alignment is standardized per JEDEC DO-213AA and verified in manufacturing via automated optical inspection.
ZMM5237B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AC, MINI-MELF, SOD-80
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 8.2 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:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
ZMM5237B-7 FAQ
1.How can I place an order for ZMM5237B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5237B-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 ZMM5237B-7 reliable?
The price and inventory of ZMM5237B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5237B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5237B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5237B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5237B-7?
ZMM5237B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5237B-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 ZMM5237B-7?
For technical support, including ZMM5237B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5237B-7 requirements.
6.How does Aetrix verify that ZMM5237B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5237B-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 ZMM5237B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5237B-7?
All ZMM5237B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5237B-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 ZMM5237B-7 part is unused and in its original packaging.
Return procedure for ZMM5237B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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