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ZMY18
Diotec Semiconductor
DIODE ZENER 18V 1.3W MELF
3038 Pcs New Original In Stock
Zener Diode 18 V 1.3 W ±5% Surface Mount MELF DO-213AB (Plastic)
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Minimum 1
5.0 / 5.0
- (47 Ratings)
ZMY18
Product Overview
12944719
DiGi Electronics Part Number
ZMY18-DGManufacturer
Diotec Semiconductor
ZMY18
Description
DIODE ZENER 18V 1.3W MELFInventory
3038 Pcs New Original In Stock
Zener Diode 18 V 1.3 W ±5% Surface Mount MELF DO-213AB (Plastic)
Quantity
Minimum 1
Minimum 1
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ZMY18 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
18 V
Tolerance
±5%
Power - Max
1.3 W
Impedance (Max) (Zzt)
6 Ohms
Current - Reverse Leakage @ Vr
1 µA @ 10 V
Operating Temperature
-50°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
DO-213AB, MELF
Supplier Device Package
MELF DO-213AB (Plastic)
Datasheet & Documents
Datasheets
Download ZMY18 Product Specification (PDF)
HTML Datasheet
ZMY18-DG
Environmental & Export Classification
RoHS Status
Not applicable
Moisture Sensitivity Level (MSL)
Not Applicable
REACH Status
Vendor Undefined
ECCN
EAR99
HTSUS
8541.10.0050
Additional Information
Other Names
4878-ZMY18CT
2796-ZMY18TR
4878-ZMY18TR
2796-ZMY18TR-DG
4878-ZMY18DKR
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
디지 제품은 가격대비 품질이 정말 뛰어나서 항상 신뢰합니다.
Dec 02, 2025
Leur engagement pour la qualité et la livraison à temps fait d’eux mon fournisseur de confiance.
Dec 02, 2025
Ich bin begeistert von der zügigen Lieferung und dem engagierten Support.
Dec 02, 2025
DiGi Electronics delivered exceptional after-sales service, with fast and helpful responses to all my questions.
Dec 02, 2025
Pricing transparency and excellent support are the reasons I recommend DiGi Electronics.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the ZMY18 MELF zener diode in high-temperature automotive circuits?
When designing in the ZMY18 zener diode for high-temperature environments such as automotive under-hood applications, a primary risk is thermal derating due to its 1.3W max power dissipation. Even though the ZMY18 supports junction temperatures up to 150°C, sustained operation near this limit without adequate PCB copper thermal relief can lead to premature aging or thermal runaway. Ensure at least 50–100 mm² of copper connection to each pad for effective heat dissipation. Also, verify that the actual zener current under regulation doesn't exceed 65 mA (P = Vz × Iz) in enclosed environments to stay safely below thermal limits.
How does the ZMY18 compare to the BZT52C18 in terms of leakage current and stability in low-power standby circuits?
The ZMY18 offers better leakage performance compared to the BZT52C18, with a reverse leakage of only 1 µA at 10V, while the BZT52C18 typically leaks up to 5 µA under similar conditions. In low-power or battery-backed circuits where standby current is critical, selecting the ZMY18 helps reduce parasitic drain. Additionally, the ZMY18’s tighter impedance control (6Ω max Zzt) improves voltage stability under transient loads compared to many BZT series diodes, making it more suitable for precision reference applications in energy-constrained designs.
Can the ZMY18 be reliably used in surface-mount rework scenarios, and what soldering profile should I follow to avoid mechanical failure?
Yes, the ZMY18 in the MELF DO-213AB package can be used in SMT rework, but special care is needed due to the cylindrical shape's tendency to roll and susceptibility to thermal shock. Use a reflow profile that complies with JEDEC MSL dry-packaging guidelines—even though MELF devices are typically MSL exempt, rapid heating can crack the glass body. Limit maximum ramp rate to 2.5°C/s and peak temperature to 260°C. For hand rework, use precision nozzles with localized heating and avoid mechanical stress during placement to prevent lead detachment or substrate cracking.
What are the reliability concerns when replacing through-hole 1N752A zener diodes with the surface-mount ZMY18 in legacy designs?
Replacing a 1N752A with the ZMY18 introduces several reliability considerations: while both regulate at 18V, the ZMY18’s MELF package has lower thermal mass and depends heavily on PCB heatsinking, unlike the through-hole 1N752A’s lead-frame dissipation. In legacy systems not designed for SMT thermal management, the ZMY18 may overheat under continuous load unless adjacent traces are widened. Also, vibration-prone environments may risk solder joint fatigue with the MELF shape—consider adhesive bonding or conformal coating. Validate long-term operation with thermal imaging at max ambient temperature.
Under what conditions might the ZMY18 exhibit excessive zener impedance and affect regulation accuracy in voltage reference circuits?
The ZMY18 maintains regulation accuracy best when operated between 5 mA and 50 mA—the specified test current range for stable zener impedance (max 6Ω). Operating below 5 mA increases dynamic impedance significantly, leading to poor line regulation in voltage reference configurations. Avoid using it in low-current shunt regulators powered through high-value series resistors. For precision applications, pair the ZMY18 with a series buffer amplifier and maintain a minimum bias current of 10 mA to ensure stable 18V output with minimal drift and noise.
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.
ZMY18 CAD Models
Diotec Semiconductor ZMY18 PCB symbols & footprints
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