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ZMM20
Diotec Semiconductor
ZENERDIODE,SOD-80,20V,0.5W,5%
16162 Pcs New Original In Stock
Zener Diode 20 V 500 mW ±5% Surface Mount SOD-80C
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5.0 / 5.0
- (433 Ratings)
ZMM20
Product Overview
12944190
DiGi Electronics Part Number
ZMM20-DGManufacturer
Diotec Semiconductor
ZMM20
Description
ZENERDIODE,SOD-80,20V,0.5W,5%Inventory
16162 Pcs New Original In Stock
Zener Diode 20 V 500 mW ±5% Surface Mount SOD-80C
Quantity
Minimum 1
Minimum 1
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ZMM20 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
-
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
20 V
Tolerance
±5%
Power - Max
500 mW
Impedance (Max) (Zzt)
55 Ohms
Current - Reverse Leakage @ Vr
100 nA @ 15 V
Operating Temperature
-50°C ~ 175°C (TJ)
Mounting Type
Surface Mount
Package / Case
DO-213AC, MINI-MELF, SOD-80
Supplier Device Package
SOD-80C
Datasheet & Documents
Datasheets
Download ZMM20 Product Specification (PDF)
HTML Datasheet
ZMM20-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Additional Information
Other Names
2721-ZMM20
Standard Package
30
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
믿고 구매할 수 있는 업체로, 항상 기대를 충족시켜줍니다.
Dec 02, 2025
포장 상태가 뛰어나서 제품이 손상 없이 안전하게 도착했어요. 정말 만족스럽습니다.
Dec 02, 2025
가격의 투명성과 친절한 고객 서비스 덕분에 만족합니다.
Dec 02, 2025
DiGi Electronics ist meine erste Wahl wegen der günstigen Preise und des freundlichen Kundenservice.
Dec 02, 2025
The team’s expertise reassures me that I’m making the right choice.
Dec 02, 2025
I appreciate their dedication to fast delivery and customer satisfaction.
Dec 02, 2025
Excellent proactive communication and quick delivery made this a first-rate experience.
Dec 02, 2025
Their online FAQ section is comprehensive, answering most questions without waiting for support.
Dec 02, 2025
I find their prices to be some of the best in the market for the quality they offer.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the ZMM20 in a high-temperature automotive environment near 175°C?
When designing the ZMM20 into high-temperature automotive applications, the primary risk is maintaining stable regulation as the junction approaches its 175°C maximum operating temperature. At elevated temperatures, Zener diodes can experience increased leakage current and parametric drift. To mitigate this, ensure adequate PCB copper for heat dissipation and avoid placing the ZMM20 near heat-generating components. Also consider derating the power below 500 mW to extend long-term reliability. The ZMM20's SOD-80C package has limited thermal mass, so sustained thermal cycling must be evaluated for solder joint integrity in underhood locations.
How does the ZMM20 compare to the BZT52C20 and BZX84-C20 for surface-mount 20V Zener replacement in power supply feedback circuits?
The ZMM20, BZT52C20, and BZX84-C20 are all 20V ±5% SMT Zener diodes, but differ in package thermal performance and dynamic impedance. The ZMM20 in SOD-80C offers better thermal stability and lower Zzt (55 Ω max) than the BZX84-C20 (in SOD-92, ~90 Ω), making it more suitable for precision feedback loops requiring stable impedance. The BZT52C20 (SOD-323) is smaller but has poorer power dissipation. For designs prioritizing long-term regulation accuracy and thermal resilience, the ZMM20 is preferred over BZX84-C20; however, if board space is constrained, evaluate BZT52C20 with current limiting. Always verify equivalent reverse leakage (100 nA @ 15 V for ZMM20) to avoid loading sensitive nodes.
Can the ZMM20 reliably handle repetitive transient overvoltage events in a 24V industrial control circuit without degradation?
The ZMM20 can handle short-duration transients in 24V industrial systems, but reliability depends on current limiting and event frequency. Without a series resistor or current control, transient energy can exceed the 500 mW steady-state rating and cause cumulative damage. Design with a series resistor to cap peak current below 25 mA (considering 20V regulation), and use transient modeling to confirm power dissipation remains within safe limits. Repeated clamping near the thermal limits may accelerate aging due to electromigration. For harsh industrial environments, pairing the ZMM20 with a TVS diode for bulk transient suppression improves longevity and ensures the ZMM20 operates within its specified safe operating area.
What PCB layout best practices should be followed when integrating the ZMM20 to maintain stable Zener regulation and thermal performance?
To ensure stable regulation with the ZMM20, use symmetric, wide copper traces on both anode and cathode pads to act as heat spreaders, minimizing thermal resistance. The SOD-80C package has a cylindrical body—avoid thermal imbalance by matching pad sizes and using thermal relief only on inner layers. Place the ZMM20 away from high-heat sources and avoid vias in pads unless necessary. For precision applications, guard against leakage by including a small clearance (1–2 mm) between high-impedance nodes and adjacent traces. Also, orient the cathode band visibly for inspection. Proper layout prevents localized heating that could shift the Zener voltage beyond ±5% tolerance over time.
Is the ZMM20 a viable long-term replacement for older through-hole 1N4747A Zener diodes in existing 20V regulator designs being converted to SMT?
The ZMM20 can serve as a surface-mount replacement for the 1N4747A in 20V regulation, but key differences must be addressed. The 1N4747A handles 1W power in a DO-41 package with better natural convection cooling, while the ZMM20 is limited to 500 mW in a smaller SOD-80C. Derate the ZMM20 current to ~20 mA (from 45 mA for 1N4747A) to stay within safe power limits. Also, confirm that the SOD-80C footprint fits the reflow profile—MINI-MELF packages can tombstone if pad symmetry or stencil design is poor. Consider long-term reliability: the ZMM20’s high operating temperature range (-50°C to 175°C) and RoHS3 compliance support automotive and industrial life cycles, but verify mechanical robustness under vibration if replacing a through-hole part in harsh environments.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
ZMM20 CAD Models
Diotec Semiconductor ZMM20 PCB symbols & footprints
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