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ZMY27
Diotec Semiconductor
ZENER MELF 27V 1.3W 5%
23840 Pcs New Original In Stock
Zener Diode 27 V 1.3 W ±5% Surface Mount MELF DO-213AB
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5.0 / 5.0
- (430 Ratings)
ZMY27
Product Overview
12944546
DiGi Electronics Part Number
ZMY27-DGManufacturer
Diotec Semiconductor
ZMY27
Description
ZENER MELF 27V 1.3W 5%Inventory
23840 Pcs New Original In Stock
Zener Diode 27 V 1.3 W ±5% Surface Mount MELF DO-213AB
Quantity
Minimum 1
Minimum 1
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ZMY27 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
27 V
Tolerance
±5%
Power - Max
1.3 W
Impedance (Max) (Zzt)
7 Ohms
Current - Reverse Leakage @ Vr
1 µA @ 14 V
Operating Temperature
-50°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
DO-213AB, MELF
Supplier Device Package
MELF DO-213AB
Datasheet & Documents
Datasheets
Download ZMY27 Product Specification (PDF)
HTML Datasheet
ZMY27-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
Not Applicable
REACH Status
REACH Unaffected
HTSUS
8541.10.0000
Additional Information
Other Names
4878-ZMY27CT
2796-ZMY27TR-DG
4878-ZMY27TR
2796-ZMY27TR
4878-ZMY27DKR
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
웹사이트 운영이 원활해서 구매 경험이 매우 만족스러웠어요.
Dec 02, 2025
디지털 제품 구매를 위한 최고의 사이트라고 생각해요. 가격이 착하고 경험이 좋아요.
Dec 02, 2025
The packaging is not only secure but also eco-friendly, which I appreciate.
Dec 02, 2025
Their competitive prices do not compromise on support quality. I received quick help whenever needed.
Dec 02, 2025
The delivery was lightning fast; I received my order in just two days, which exceeded my expectations.
Dec 02, 2025
I admire DiGi Electronics’ commitment to fair and transparent pricing.
Dec 02, 2025
I appreciate how quickly DiGi Electronics ships out my purchases, making my workflow seamless.
Dec 02, 2025
DiGi Electronics combines affordability with a team that genuinely cares about customer satisfaction.
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Frequently Asked Questions (FAQ)
What are the key reliability risks when using the ZMY27 Zener diode in high-humidity environments, and how can I mitigate them despite its MELF DO-213AB package lacking a conformal coating?
The ZMY27, packaged in a MELF DO-213AB, is susceptible to moisture-induced corrosion at the lead-to-body interface over time, especially in high-humidity or condensing environments, due to its uncoated cylindrical glass body. Although it has no official MSL rating (MSL: Not Applicable), prolonged exposure can lead to increased reverse leakage or parametric drift. To mitigate this, apply a thin, uniform conformal coating (e.g., acrylic or silicone-based) after assembly, ensuring full coverage of the glass-metal seal. Avoid silicone coatings if high-voltage isolation is critical, as they can trap ionic contaminants. Always perform environmental stress testing (e.g., 85°C/85% RH for 168 hours) during qualification.
Can I replace the ZMY27 with a BZX84C27LT1G in a 27V, 1W reference circuit, and what performance trade-offs should I expect?
While the BZX84C27LT1G (ON Semiconductor) offers similar 27V ±5% Zener voltage and SOT-23 packaging, it is not a drop-in replacement for the ZMY27 due to significant differences in power handling and thermal performance. The ZMY27 supports 1.3W in a MELF DO-213AB package with superior thermal dissipation, whereas the BZX84C27LT1G is rated for only 350mW in SOT-23. In a 1W application, the BZX84C27LT1G would overheat, leading to thermal runaway or premature failure. Additionally, the BZX84C27LT1G has higher dynamic impedance (~10Ω vs. 7Ω for ZMY27), resulting in poorer regulation under load transients. Use the BZX84C27LT1G only in low-power (<100mW) signal-level applications, not as a direct replacement in power-sensitive designs.
How does the ZMY27’s reverse leakage current of 1 µA @ 14V impact low-power battery-operated systems, and is this leakage stable across its full temperature range?
The ZMY27’s specified reverse leakage of 1 µA @ 14V may seem negligible, but in ultra-low-power systems (e.g., IoT sensors with multi-year battery life), cumulative leakage across multiple components can significantly reduce operational lifespan. More critically, Zener leakage increases exponentially with temperature—expect leakage to rise to 10–50 µA at 125°C junction temperature. In a battery-powered reference circuit, this could introduce tens of µA of unwanted load current during high ambient conditions. To minimize impact, derate the operating voltage well below breakdown (e.g., use at 20V for a 27V Zener) and consider temperature-compensated references like bandgap circuits for precision applications. Always validate leakage under worst-case thermal conditions during prototyping.
What PCB layout practices are critical when mounting the ZMY27 in a high-current transient environment to avoid thermal stress and ensure long-term reliability?
The ZMY27’s MELF DO-213AB package relies on axial leads for heat dissipation, making PCB layout crucial for thermal management. In high-current transient scenarios (e.g., surge protection or crowbar circuits), inadequate copper area can cause localized heating and thermal cycling fatigue at the solder joints. Use large, symmetrical thermal pads with multiple vias to a ground or power plane to enhance heat spreading. Maintain a minimum of 50 mm² of 2 oz copper per lead, and avoid placing the ZMY27 near heat-sensitive components. Additionally, ensure mechanical support—MELF packages are prone to vibration-induced cracking if unsupported. For repetitive pulses, calculate junction temperature using transient thermal impedance (Zth) curves and derate power accordingly to stay below 150°C Tj.
Is the ZMY27 suitable for use in a 24V industrial power supply’s overvoltage protection circuit, and how does its ±5% tolerance affect threshold accuracy compared to precision TVS diodes?
The ZMY27 can be used in 24V overvoltage protection, but its ±5% tolerance (25.65V to 28.35V breakdown) introduces significant uncertainty in trip threshold, which may be unacceptable in precision industrial systems. For example, a 27V Zener might begin conducting as low as 25.65V—only 1.65V above nominal 24V rail—risking nuisance triggering during normal voltage spikes. In contrast, precision TVS diodes like the SMAJ26A (26V ±5%, but with tighter clamping ratios) or active clamp circuits offer better-defined thresholds. If using the ZMY27, combine it with a comparator-based trigger circuit to add hysteresis and delay, preventing false activation. For mission-critical protection, consider a dedicated supervisory IC with adjustable thresholds instead of relying solely on the ZMY27’s inherent breakdown behavior.
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.
ZMY27 CAD Models
Diotec Semiconductor ZMY27 PCB symbols & footprints
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