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ZMM3.9
Diotec Semiconductor
DIODE ZENER 3.9V 500MW SOD80C
22622 Pcs New Original In Stock
Zener Diode 3.9 V 500 mW ±5% Surface Mount SOD-80C
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5.0 / 5.0
- (164 Ratings)
ZMM3.9
Product Overview
12944055
DiGi Electronics Part Number
ZMM3.9-DGManufacturer
Diotec Semiconductor
ZMM3.9
Description
DIODE ZENER 3.9V 500MW SOD80CInventory
22622 Pcs New Original In Stock
Zener Diode 3.9 V 500 mW ±5% Surface Mount SOD-80C
Quantity
Minimum 1
Minimum 1
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ZMM3.9 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
3.9 V
Tolerance
±5%
Power - Max
500 mW
Impedance (Max) (Zzt)
85 Ohms
Current - Reverse Leakage @ Vr
2 µA @ 1 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 ZMM3.9 Product Specification (PDF)
HTML Datasheet
ZMM3.9-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-ZMM3.9CT
2796-ZMM3.9TR
4878-ZMM3.9DKR
4878-ZMM3.9TR
2796-ZMM3.9TR-DG
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
商品品質非常可靠，用料實在，買得很放心。
Dec 02, 2025
I couldn't believe how quickly the order arrived; excellent delivery service.
Dec 02, 2025
DiGi Electronics offers incredible value without sacrificing quality.
Dec 02, 2025
Their competitive prices make it easier to meet budget constraints without compromising on quality.
Dec 02, 2025
Tracking notifications were clear and straightforward, making follow-up simple and worry-free.
Dec 02, 2025
Their post-sale support includes detailed documentation and training, making system integration easier.
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Frequently Asked Questions (FAQ)
Can the ZMM3.9 Zener diode safely replace a BZX84-C3V9 in a 3.8V–4.0V reference circuit for a low-power sensor interface, and what are the key reliability risks?
Yes, the ZMM3.9 (3.9V ±5%, 500mW) can functionally replace the BZX84-C3V9 in most low-current reference applications, as both share similar nominal voltage and SOD-80C packaging. However, the ZMM3.9 has a higher typical dynamic impedance (85Ω vs. ~20Ω for BZX84-C3V9), which may increase output voltage variation under load transients—critical in precision analog circuits. Additionally, the ZMM3.9’s reverse leakage is specified at 2µA @ 1V, whereas the BZX84-C3V9 typically leaks <0.5µA, potentially affecting ultra-low-power designs. Verify stability under actual load conditions and consider adding a buffer op-amp if noise or regulation accuracy is paramount.
What are the thermal derating implications of using the ZMM3.9 in an enclosed industrial control module operating near 150°C ambient, and how does this compare to alternatives like the MMSZ4683T1G?
The ZMM3.9 is rated for junction temperatures up to 175°C, but its 500mW power rating must be thermally derated above 25°C. At 150°C ambient in a confined space, effective power handling may drop below 100mW without a thermal pad or airflow—risking thermal runaway under sustained reverse bias. In contrast, the MMSZ4683T1G (also 3.9V, 500mW, SOD-123) has better thermal performance due to larger package thermal mass and lower Zzt (~40Ω), making it more robust in high-temp environments. For reliability, either add copper pour under the ZMM3.9 or switch to a package with superior thermal dissipation if continuous operation above 125°C is expected.
How does the ZMM3.9’s ±5% tolerance impact design margin when used as a voltage clamp in a 5V microcontroller I/O protection circuit, and should I consider tighter-tolerance alternatives?
With ±5% tolerance, the ZMM3.9’s actual breakdown voltage can range from 3.705V to 4.095V. In a 5V MCU I/O clamp, this creates a narrow but acceptable safety margin (assuming 4.095V < MCU absolute max of typically 5.5V). However, during fast transients (e.g., ESD or inductive spikes), the clamping response depends heavily on dynamic impedance (85Ω max), which may allow overshoot beyond the nominal Vz. For mission-critical or automotive-grade designs, consider tighter-tolerance options like the BZT52C3V9 (±2%) or implement a TVS diode in parallel for robust transient suppression. Always validate with worst-case transient testing.
Is the ZMM3.9 suitable for battery-powered IoT devices where quiescent current matters, given its 2µA reverse leakage at 1V—and how does this compare to modern low-leakage Zeners like the MM3Z3V9?
The ZMM3.9’s 2µA leakage @ 1V is relatively high for ultra-low-power IoT nodes; in a 3.3V system, leakage could exceed 5µA near breakdown, significantly impacting sleep-mode battery life. The MM3Z3V9 (3.9V, SOD-323) offers <0.1µA leakage and better low-power performance, albeit in a smaller package with reduced power handling (200mW). If your design operates below 200mW and prioritizes microamp-level standby current, the MM3Z3V9 is preferable. Otherwise, the ZMM3.9 remains viable for non-battery or higher-power edge devices—but always measure actual leakage at your operating voltage, as it increases nonlinearly near Vz.
Can I use multiple ZMM3.9 diodes in parallel to increase current handling in a crowbar overvoltage protection circuit, and what are the failure risks?
Paralleling ZMM3.9 diodes to boost current capacity in a crowbar circuit is not recommended due to inherent Vz mismatches (±5% tolerance) and negative temperature coefficient near breakdown. Even small voltage differences cause uneven current sharing, leading to thermal imbalance and premature failure of the lowest-Vz unit. Unlike power Zeners designed for parallel operation, the ZMM3.9 lacks current-balancing features. Instead, select a single higher-power Zener (e.g., 1N5339B, 3.9V 5W in DO-41) or use a dedicated IC-based crowbar solution. If you must parallel, add individual series resistors (e.g., 10–22Ω) to force current sharing—but this reduces response speed and increases footprint, negating the benefit.
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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.
ZMM3.9 CAD Models
Diotec Semiconductor ZMM3.9 PCB symbols & footprints
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