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ZMY33
Diotec Semiconductor
ZENERDIODE,MELF,33V,1.3W,5%
23966 Pcs New Original In Stock
Zener Diode 33 V 1.3 W ±5% Surface Mount MELF DO-213AB
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5.0 / 5.0
- (496 Ratings)
ZMY33
Product Overview
12944797
DiGi Electronics Part Number
ZMY33-DGManufacturer
Diotec Semiconductor
ZMY33
Description
ZENERDIODE,MELF,33V,1.3W,5%Inventory
23966 Pcs New Original In Stock
Zener Diode 33 V 1.3 W ±5% Surface Mount MELF DO-213AB
Quantity
Minimum 1
Minimum 1
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ZMY33 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Strip
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
33 V
Tolerance
±5%
Power - Max
1.3 W
Impedance (Max) (Zzt)
8 Ohms
Current - Reverse Leakage @ Vr
1 µA @ 17 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 ZMY33 Product Specification (PDF)
HTML Datasheet
ZMY33-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Additional Information
Other Names
2721-ZMY33
Standard Package
30
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Shipping was exceptionally fast—definitely a reliable place for quick deliveries.
Dec 02, 2025
Shipping speed was excellent, and the support team provided timely help.
Dec 02, 2025
Their shipping process is smooth and consistently on schedule.
Dec 02, 2025
Affordable and dependable—these are the qualities I associate with DiGi Electronics.
Dec 02, 2025
DiGi Electronics offers exceptional after-sales support that truly sets them apart in the industry.
Dec 02, 2025
DiGi Electronics provides a perfect balance of cost efficiency and ease of shopping.
Dec 02, 2025
The friendly and professional staff make shopping a joy.
Dec 02, 2025
I received my order promptly, and the communication from the customer service team was excellent.
Dec 02, 2025
Thanks to their attractive prices, I can stretch my budget further.
Dec 02, 2025
I feel confident purchasing from DiGi Electronics due to their reliable support.
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Frequently Asked Questions (FAQ)
Can the ZMY33 Zener diode handle short-term power surges in surface-mount power supply designs without failure?
Yes, the ZMY33 can tolerate brief power surges beyond its 1.3 W continuous rating due to its MELF DO-213AB package's thermal mass, but sustained overloads above 1.3 W should be avoided. For reliable operation in transient-heavy environments (e.g., automotive or industrial power rails), design in current-limiting resistance and ensure PCB copper pads provide adequate heat dissipation. Monitor junction temperature to stay within the -50°C to 150°C range, especially when the ZMY33 is used in voltage-clamping applications where surge currents may exceed 100 mA intermittently.
How does the ZMY33 compare to the BZX84-C33 in voltage regulation stability for low-current bias networks?
The ZMY33 offers lower dynamic impedance (8 Ω max vs. ~15–20 Ω for BZX84-C33) and higher power handling (1.3 W vs. 500 mW), making it more stable under varying load currents in precision reference circuits. While the BZX84-C33 is common in general-purpose SMD applications, the ZMY33 provides tighter regulation and better thermal resilience in designs where current exceeds 20 mA or where ambient temperatures approach 100°C. Use the ZMY33 when long-term stability and reduced drift in low-noise analog circuits are critical.
What are the key layout considerations when replacing a through-hole 1N745A with the surface-mount ZMY33 in a legacy design?
When replacing the 1N745A (33 V, 500 mW, DO-41) with the ZMY33 in a surface-mount conversion, ensure the PCB layout accounts for the MELF DO-213AB’s round body to prevent tombstoning during reflow. Use symmetric copper pads and consider adhesive dot pre-attach for reliability. The ZMY33’s higher 1.3 W rating allows for greater current drive (up to 39 mA vs. 15 mA), but verify that the new layout includes thermal relief traces or heat paths to avoid localized overheating under continuous load. Also confirm the ZMY33’s ±5% tolerance meets your regulation needs, as the 1N745A typically has looser initial tolerance.
Is the ZMY33 suitable for voltage feedback loops in SMPS designs operating near 150°C junction temperature?
The ZMY33 is rated for junction temperatures up to 150°C, making it viable for use in switch-mode power supply (SMPS) feedback networks in high-temperature environments, such as under-hood automotive systems. However, ensure derating is applied—operate below 800 mW above 100°C to maintain long-term reliability. Monitor reverse leakage, which may increase near max temperature, potentially affecting feedback accuracy. Use in conjunction with temperature-stable resistors and consider adding hysteresis or soft-start circuitry to mitigate thermal runaway risks in tightly regulated designs.
What are the reliability risks of using the ZMY33 in high-humidity environments without conformal coating?
The ZMY33’s MELF DO-213AB package uses moisture-resistant materials, but its glass-passivated junction and lead attachment remain vulnerable to leakage currents and electrochemical migration in high-humidity or contaminated environments (e.g., outdoor or industrial settings). Operating at 33 V increases field-driven ion migration risks if condensation occurs. To ensure reliability, apply conformal coating or use in sealed enclosures. For mission-critical applications, consider accelerated life testing with 85°C/85% RH conditions to verify long-term integrity. The RoHS3 compliance of the ZMY33 ensures no lead-based solder corrosion issues, but environmental protection remains essential for sustained performance.
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.
ZMY33 CAD Models
Diotec Semiconductor ZMY33 PCB symbols & footprints
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