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Diodes Incorporated ZMM5250B-7
- Part No.:
- ZMM5250B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5250B-7.pdf
- Description:
- DIODE ZENER 20V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,305
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Product details
Overview
ZMM5250B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 20V (19.0–21.0V range), 6.2mA test current, 25Ω maximum zener impedance at IZT, and +0.086%/°C temperature coefficient. It uses a MiniMELF glass package for precision voltage reference in low-power analog circuits.
For engineers reviewing the ZMM5250B-7 datasheet, ZMM5250B-7 pinout, ZMM5250B-7 application, or ZMM5250B-7 equivalent, this device serves as a stable shunt regulator in power supply feedback loops, overvoltage protection clamps, and precision reference circuits where tight voltage tolerance and low thermal drift are required.
Technical Context
The ZMM5250B-7 operates as a silicon planar Zener diode optimized for stable reverse-biased breakdown at 20V under 6.2mA test current. Its +0.086%/°C temperature coefficient ensures predictable VZ drift across -65°C to +175°C operating range.
Designed for surface-mount assembly on PCBs, it features a hermetic glass MiniMELF (DO-213AA) package with cathode band polarity marking and solderable terminals compliant with MIL-STD-202, Method 208. Thermal resistance is 300°C/W junction-to-ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, 19.0–21.0 V range at IZT = 6.2 mA - defines precise clamping/reference level |
| Power Dissipation | 500 mW - limits continuous DC or pulsed power handling in compact layouts |
| Zener Impedance (ZZT) | ≤25 Ω at IZT = 6.2 mA - ensures low dynamic resistance for stable regulation |
| Reverse Current (IR) | ≤0.1 µA at VR = 15 V - guarantees minimal leakage in high-impedance bias networks |
| Temp Coefficient (TC) | +0.086 %/°C - enables predictable VZ shift over temperature for compensated designs |
| Junction Temp Range | -65°C to +175°C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
MiniMELF (DO-213AA) hermetic glass package: cylindrical body, axial leads, cathode band marking. Dimensions: A = 3.30–3.70 mm (length), B = 1.30–1.60 mm (diameter), C = 0.28–0.50 mm (lead diameter). Weight ≈ 0.034 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in shunt configuration | Connected to ground or lower potential node when used as voltage reference or clamp |
| Cathode | Zener breakdown terminal / high-side connection | Connected to regulated node or input rail; marked by visible band for polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| Stable 20V Zener Reference | Guaranteed 19.0–21.0V range at 6.2mA enables accurate feedback in SMPS error amplifiers |
| Low Dynamic Impedance | ≤25Ω at IZT minimizes output voltage variation under load transients |
| Hermetic Glass Encapsulation | DO-213AA package provides moisture resistance and long-term parameter stability |
| Wide Operating Temperature | -65°C to +175°C rating supports deployment in engine control units and industrial PLCs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 20V threshold to TL431-like control circuitry. Use Value: Tight 19.0–21.0V tolerance and +0.086%/°C TC enable ±1% output regulation across temperature. | Use Scenario: Protecting microcontroller I/O pins from ESD or surge-induced voltage spikes. IC Role / Device Role / Timing Role: Low-leakage (≤0.1µA @ 15V) clamping element diverting excess energy to ground. Use Value: 25Ω zener impedance ensures rapid response to transients without overshoot beyond safe logic thresholds. |
| Precision Analog Reference | Current Source Biasing |
Use Scenario: Generating stable bias voltage for op-amp input stages in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-drift 20V reference feeding resistive divider to produce sub-1% reference voltages. Use Value: +0.086%/°C TC allows compensation via matched resistor networks for <50ppm/°C system drift. | Use Scenario: Setting constant current in LED driver or DAC output buffer circuits. IC Role / Device Role / Timing Role: Fixed-voltage node establishing ISET = VZ/RSET in two-terminal current sources. Use Value: 500mW rating supports ≥10mA drive capability with derating above 70°C ambient per Fig.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C20 (Vishay) | Same 20V nominal, but DO-35 package (larger, axial lead); 500mW rating; higher ZZT (≤50Ω) | Through-hole assembly only; less suitable for high-density SMT boards | Select for legacy through-hole designs or where manual rework access is prioritized |
| MMSZ5250B (ON Semiconductor) | SOD-123 package (smaller footprint); same 20V, 6.2mA, 25Ω ZZT; slightly wider VZ tolerance (19.0–21.2V) | Better board space efficiency; lower thermal resistance (250°C/W vs 300°C/W) | Prefer for space-constrained consumer electronics with automated reflow requirements |
Compared with BZX55C20 and MMSZ5250B, the ZMM5250B-7 offers superior thermal performance in MiniMELF form factor and tighter VZ consistency than MMSZ5250B, while enabling SMT assembly unlike BZX55C20 - making it optimal for automotive and industrial modules requiring reliability and density.
Availability
ZMM5250B-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, precision analog references, and current source biasing requiring stable component supply and long-lifecycle support.
Supply support for ZMM5250B-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.
The ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and clamping in automotive, industrial, and communications equipment where reliability under thermal stress is critical.
FAQ
What is the maximum continuous power dissipation for ZMM5250B-7 at 70°C ambient?
At 70°C ambient temperature, the ZMM5250B-7's maximum continuous power dissipation is approximately 350 mW, derived from its 500 mW rating at 25°C and linear derating slope of 3.33 mW/°C (per Fig.1 in DS30024 Rev. C-2). This ensures safe operation without exceeding 175°C junction temperature under typical PCB copper area conditions.
Does ZMM5250B-7 have a specified junction capacitance?
No, the official Diodes Incorporated datasheet (DS30024 Rev. C-2) does not list a specified junction capacitance value for ZMM5250B-7. Figure 2 shows junction capacitance vs. zener voltage for the full ZMM52xxB family, estimating ~12 pF at 20V, but this is a graphical approximation-not a guaranteed parameter. Designers requiring controlled capacitance should verify with bench measurement or select a part with published Cj.
Can ZMM5250B-7 be used in place of a 20V Zener in a TL431-based feedback circuit?
Yes - ZMM5250B-7 is commonly used as the external reference in TL431 feedback networks. Its 20V nominal voltage, 6.2mA test current, and ≤25Ω zener impedance match TL431's reference input requirements. Ensure series resistor limits current to 6–10mA and accounts for TL431's 2.5V reference draw to maintain regulation accuracy.
Is the cathode band orientation standardized for MiniMELF devices like ZMM5250B-7?
Yes - the cathode band on ZMM5250B-7 follows JEDEC DO-213AA standard: it marks the cathode terminal, which must connect to the higher-potential node in Zener operation. Visual inspection confirms polarity, and automated optical inspection (AOI) systems recognize the band position per IPC-A-610 guidelines for MiniMELF placement verification.
ZMM5250B-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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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
ZMM5250B-7 FAQ
1.How can I place an order for ZMM5250B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5250B-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 ZMM5250B-7 reliable?
The price and inventory of ZMM5250B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5250B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5250B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5250B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5250B-7?
ZMM5250B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5250B-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 ZMM5250B-7?
For technical support, including ZMM5250B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5250B-7 requirements.
6.How does Aetrix verify that ZMM5250B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5250B-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 ZMM5250B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5250B-7?
All ZMM5250B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5250B-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 ZMM5250B-7 part is unused and in its original packaging.
Return procedure for ZMM5250B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5250B-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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