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SMZ12
Diotec Semiconductor
ZENER MELF 12V 2W 5%
24841 Pcs New Original In Stock
Zener Diode 12 V 2 W ±5% Surface Mount MELF DO-213AB
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5.0 / 5.0
- (283 Ratings)
SMZ12
Product Overview
12944672
DiGi Electronics Part Number
SMZ12-DGManufacturer
Diotec Semiconductor
SMZ12
Description
ZENER MELF 12V 2W 5%Inventory
24841 Pcs New Original In Stock
Zener Diode 12 V 2 W ±5% Surface Mount MELF DO-213AB
Quantity
Minimum 1
Minimum 1
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SMZ12 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
12 V
Tolerance
±5%
Power - Max
2 W
Impedance (Max) (Zzt)
4 Ohms
Current - Reverse Leakage @ Vr
1 µA @ 7 V
Operating Temperature
150°C (TJ)
Mounting Type
Surface Mount
Package / Case
DO-213AB, MELF
Supplier Device Package
MELF DO-213AB
Datasheet & Documents
Datasheets
Download SMZ12 Product Specification (PDF)
HTML Datasheet
SMZ12-DG
Environmental & Export Classification
RoHS Status
Not applicable
Moisture Sensitivity Level (MSL)
Not Applicable
REACH Status
Vendor Undefined
ECCN
EAR99
HTSUS
8541.10.0000
Additional Information
Other Names
2796-SMZ12TR
Standard Package
5,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
他們的價格透明實在，服務也很優質，讓我每次都很安心。
Dec 02, 2025
Toujours impressionné par la qualité et la rapidité. Je recommande vivement DiGi Electronics.
Dec 02, 2025
Leur gestion logistique minutieuse nous évite tout doublon ou erreur dans la réception des marchandises.
Dec 02, 2025
Sehr beeindruckt von der Kostenersparnis und der benutzerfreundlichen Webseite. Absolut empfehlenswert.
Dec 02, 2025
品質の高さはもちろん、スタッフの対応も非常に丁寧で信頼しています。
Dec 02, 2025
We've built a trusting relationship with DiGi Electronics due to their consistent performance.
Dec 02, 2025
Their customer support adds great value to our purchasing experience.
Dec 02, 2025
They offer fantastic discounts, complemented by fast and reliable shipping.
Dec 02, 2025
Affordable pricing combined with excellent quality makes this my go-to online shop.
Dec 02, 2025
Their shipping process is efficient, and I often receive my order the day after I purchase.
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Frequently Asked Questions (FAQ)
When designing in the SMZ12 Zener diode, what thermal considerations should I account for to avoid exceeding its maximum junction temperature in a surface-mount application?
When using the SMZ12 in a surface-mount design, ensure adequate copper land area (typically ≥10 mm²) on the PCB to act as a heatsink, especially when operating near its 2 W power dissipation limit. The MELF DO-213AB package has limited thermal conductivity, so without sufficient trace area, the junction temperature can exceed 150°C even at moderate ambient temperatures. Use thermal vias under the pad if possible and avoid placing the SMZ12 near other heat-generating components to mitigate thermal runaway risks in voltage regulation circuits.
Can the SMZ12 replace a BZX84-C12 in a precision voltage reference circuit, and what are the key performance differences I should evaluate?
While both the SMZ12 and BZX84-C12 are 12V Zener diodes, the SMZ12 offers lower dynamic impedance (4 Ω max vs ~20 Ω for BZX84-C12) and higher power dissipation (2W vs 500mW), making it better suited for regulation under variable loads. However, the BZX84-C12 comes in a more common SOD-87 package with better PCB footprint availability. When replacing, confirm that your PCB layout supports the MELF DO-213AB package of the SMZ12 and that voltage stability under low current (below 5 mA) is acceptable, as MELF Zeners can have softer knee characteristics.
How does the low reverse leakage current (1 µA @ 7V) of the SMZ12 impact its suitability for low-power battery protection circuits?
The SMZ12's low reverse leakage of 1 µA @ 7V makes it well-suited for battery-powered designs where minimizing standby current is critical. In overvoltage protection or voltage clamping roles, this leakage won't significantly drain the battery over time. However, ensure that the circuit operates above the Zener's 'knee' region (near 12V) for reliable regulation, as leakage below nominal voltage doesn't indicate dynamic performance. Avoid using the SMZ12 in high-impedance node protection unless bias current is guaranteed above 1 mA.
What are the mechanical reliability risks of using the SMZ12's MELF DO-213AB package in environments with thermal cycling or vibration?
The cylindrical MELF DO-213AB package of the SMZ12 has higher susceptibility to mechanical stress fractures during thermal cycling or vibration compared to flat leaded packages. To improve reliability, use adhesive bonding during reflow assembly and symmetric PCB pad layouts with tear-drop traces to relieve stress. In high-reliability systems, consider alternatives like SMA-stable Zeners (e.g., PTVS2E12VS) unless the SMZ12's power and impedance advantages are essential for the design.
In a voltage regulation circuit, how does the ±5% tolerance of the SMZ12 affect output accuracy, and when should I consider a tighter-tolerance alternative?
The SMZ12's ±5% Zener voltage tolerance (11.4V to 12.6V) introduces significant variation in output regulation, making it unsuitable for precision reference applications requiring better than ±5% accuracy. For improved stability, pair the SMZ12 with an op-amp feedback loop or consider active voltage references like the LM4040 (which offers ±0.5% accuracy). If a discrete solution is required, evaluate the SMZ12A series if available, or consider post-calibration trimming in critical measurement circuits.
Quality Assurance (QC)
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SMZ12 CAD Models
Diotec Semiconductor SMZ12 PCB symbols & footprints
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