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Diodes Incorporated ZMM5266B-7
- Part No.:
- ZMM5266B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5266B-7.pdf
- Description:
- DIODE ZENER 68V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,496
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Product details
Overview
ZMM5266B-7 from Diodes Incorporated is a 68 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, rated for 1.8 mA test current, 230 Ω maximum dynamic impedance at 1 mA, and +0.097 %/°C temperature coefficient - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the ZMM5266B-7 datasheet, ZMM5266B-7 pinout, ZMM5266B-7 application, or ZMM5266B-7 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (300 °C/W), junction capacitance (~2.5 pF at 2 V), reverse leakage (<0.1 µA at 54.4 V), and pulse-rated power dissipation compliance per JEDEC DO-213AA mounting guidelines.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified 1.8 mA test current and 64.6–71.4 V nominal range. Its hemispheric glass MiniMELF package enables stable thermal performance up to +175 °C junction temperature and supports reflow soldering per MIL-STD-202 Method 208.
The device exhibits low dynamic impedance (230 Ω max at 1 mA) and minimal temperature drift (+0.097 %/°C), making it suitable for analog reference circuits where long-term stability under varying ambient conditions is required. Reverse leakage remains below 0.1 µA at 80% of nominal zener voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V nominal, 64.6–71.4 V min/max at IZT = 1.8 mA - defines regulated output voltage in shunt reference applications |
| Power Dissipation (PD) | 500 mW at TA = 25 °C - sets maximum continuous DC or pulsed power handling in PCB-mounted operation |
| Zener Impedance (ZZT) | 230 Ω max at IZ = 1 mA - determines AC regulation error and ripple rejection capability |
| Reverse Leakage (IR) | <0.1 µA at VR = 54.4 V - ensures negligible standby current in high-impedance bias networks |
| Temp. Coefficient (TC) | +0.097 %/°C - quantifies voltage drift per degree Celsius, critical for temperature-stable references |
| Junction-to-Ambient RθJA | 300 °C/W - defines thermal rise above ambient per watt dissipated, guiding heatsinking and layout decisions |
| Operating Temperature | −65 to +175 °C - supports industrial and automotive under-hood environments without derating |
Pinout & Package
MiniMELF (DO-213AA) glass axial package with cathode band marking; terminals are solderable per MIL-STD-202, Method 208. No discrete pins - two axial leads: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node in shunt configuration | Connected to circuit ground or lower-potential rail; establishes reference polarity for voltage clamping |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input or feedback node; maintains stable 68 V potential relative to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% (64.6–71.4 V) at 1.8 mA - enables accurate voltage setting without external trimming |
| Low dynamic impedance | 230 Ω max at 1 mA - minimizes output voltage variation under load transients |
| Stable temperature coefficient | +0.097 %/°C - reduces drift-induced error in temperature-varying environments |
| High-reliability glass package | Hermetic MiniMELF (DO-213AA) - ensures moisture resistance and long-term parameter stability |
| Reflow-solder compatible | MIL-STD-202 compliant terminations - supports automated SMT assembly without lead damage |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 68 V threshold for TL431-like control schemes. Use Value: Enables ±1% output regulation accuracy across line/load/temperature with no active compensation. |
Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Precision analog reference source replacing bulkier IC-based references in space-constrained modules. Use Value: Delivers <0.1 µA leakage and +0.097 %/°C TC to maintain sensor offset stability over −40 to +85 °C. |
| Overvoltage Clamp Protection | Programmable Threshold Detector |
Use Scenario: Protects downstream 60 V-rated MOSFET gates from transient surges in 48 V DC bus systems. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 71.4 V peak reverse voltage. Use Value: Limits gate-source stress to safe levels with sub-100 ns response and no external drive circuitry. |
Use Scenario: Sets trip point for comparator-based battery cell monitoring in 16S Li-ion packs. IC Role / Device Role / Timing Role: Programmable reference input for LM393 comparator detecting >68 V per string. Use Value: Achieves 0.5 V hysteresis margin using resistor divider while maintaining <1 ppm/°C effective drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C68 (Vishay) | Same 68 V nominal, but ±5% tolerance, 500 mW, DO-35 package - higher RθJA (500 °C/W), larger footprint | Less suitable for high-density layouts; requires greater board area and exhibits higher thermal rise | Prefer ZMM5266B-7 when MiniMELF size, lower thermal resistance, or tighter production consistency is required |
| MMBZ5266BS (Diodes Inc.) | SOT-23 packaged variant - same electrical specs but 350 mW rating, 200 °C/W RθJA, surface-mount only | Better for ultra-compact designs but derates faster above 70 °C ambient | Choose MMBZ5266BS only if board space is constrained and thermal management allows 350 mW operation |
Compared with BZX55C68 and MMBZ5266BS, ZMM5266B-7 delivers optimal balance of precision, thermal performance, and miniaturization - its 300 °C/W RθJA and DO-213AA hermeticity support higher reliability in thermally demanding industrial deployments.
Availability
ZMM5266B-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor signal conditioning, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for ZMM5266B-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 and manufacturing operations across Asia and the Americas.
ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and clamping in space-constrained, thermally aggressive applications such as power adapters and industrial instrumentation.
FAQ
What is the maximum reverse voltage before breakdown for ZMM5266B-7?
The ZMM5266B-7 begins controlled reverse breakdown at a minimum of 64.6 V and a maximum of 71.4 V when tested at 1.8 mA. It is not rated for continuous operation above 71.4 V - exceeding this risks irreversible degradation due to thermal runaway in the glass package.
Can ZMM5266B-7 be used in place of a 68 V Zener in a linear regulator error amplifier?
Yes - its 230 Ω dynamic impedance and +0.097 %/°C temperature coefficient support stable closed-loop regulation in discrete linear regulators. However, ensure the series resistor limits current to ≤1.8 mA at nominal input to avoid exceeding PD = 500 mW under worst-case ambient conditions.
Is ZMM5266B-7 RoHS compliant and halogen-free?
Yes - ZMM5266B-7 meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The MiniMELF glass body contains no brominated flame retardants or chlorine-based compounds, and all metallization complies with JEDEC J-STD-609A Class 1 requirements.
Does ZMM5266B-7 require derating above 25 °C ambient temperature?
Yes - power dissipation must be linearly derated above 25 °C at 1.67 mW/°C (500 mW ÷ 300 °C/W). At 70 °C ambient, maximum allowable dissipation drops to 425 mW. Derating curves are provided in Figure 1 of DS30024 Rev. C-2.
ZMM5266B-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):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 230 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 52 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
ZMM5266B-7 FAQ
1.How can I place an order for ZMM5266B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5266B-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 ZMM5266B-7 reliable?
The price and inventory of ZMM5266B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5266B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5266B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5266B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5266B-7?
ZMM5266B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5266B-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 ZMM5266B-7?
For technical support, including ZMM5266B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5266B-7 requirements.
6.How does Aetrix verify that ZMM5266B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5266B-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 ZMM5266B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5266B-7?
All ZMM5266B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5266B-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 ZMM5266B-7 part is unused and in its original packaging.
Return procedure for ZMM5266B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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