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BZT52C3V9
Diotec Semiconductor
ZENER SOD-123F 3.9V 0.5W 5%
116388 Pcs New Original In Stock
Zener Diode 3.9 V 500 mW ±5% Surface Mount SOD-123F
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5.0 / 5.0
- (91 Ratings)
BZT52C3V9
Product Overview
12944345
DiGi Electronics Part Number
BZT52C3V9-DGManufacturer
Diotec Semiconductor
BZT52C3V9
Description
ZENER SOD-123F 3.9V 0.5W 5%Inventory
116388 Pcs New Original In Stock
Zener Diode 3.9 V 500 mW ±5% Surface Mount SOD-123F
Quantity
Minimum 1
Minimum 1
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BZT52C3V9 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
-
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
3.9 V
Tolerance
±5%
Power - Max
500 mW
Impedance (Max) (Zzt)
130 Ohms
Current - Reverse Leakage @ Vr
5 µA @ 1 V
Operating Temperature
-50°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
SOD-123F
Supplier Device Package
SOD-123F
Datasheet & Documents
HTML Datasheet
BZT52C3V9-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-BZT52C3V9TR
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
가성비 최고이고 배송이 빨라서 큰 만족을 느끼고 있습니다.
грудня 02, 2025
長期合作下來，物流和支援都保持高水準，值得信賴！
грудня 02, 2025
Lieferungen erfolgen stets termingerecht, was meinen Einkauf sehr angenehm macht.
грудня 02, 2025
Affordable prices and exceptional support—DiGi Electronics is my go-to store.
грудня 02, 2025
Their dedication to quality is evident in every aspect of their products and services.
грудня 02, 2025
The tracking information was continuously updated, which made waiting for my order exciting and reassuring.
грудня 02, 2025
Transparent pricing policies simplify our decision-making process.
грудня 02, 2025
I always know what I am paying for, thanks to their clear pricing.
грудня 02, 2025
I was pleasantly surprised by how affordable everything was.
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Frequently Asked Questions (FAQ)
Can the BZT52C3V9 be used for voltage regulation in a 3.3V rail with tight tolerance requirements, and what design considerations should I account for?
The BZT52C3V9 has a nominal zener voltage of 3.9V ±5%, which makes it unsuitable for direct regulation of a 3.3V rail, as its regulated output will typically be higher than 3.7V. Using it on a 3.3V rail may lead to unintended clamping or leakage current effects. Instead, consider it only for overvoltage protection or reference applications where 3.9V is acceptable. If a precise 3.3V reference is needed, pair the BZT52C3V9 with a series regulator or use a low-voltage precision shunt like the TLVH431 instead. Always account for thermal drift and load variations when using the BZT52C3V9 in analog reference circuits to avoid stability issues.
How does the BZT52C3V9 compare to the MMBZ5231B in terms of leakage current and reliability in low-power battery-operated circuits?
The BZT52C3V9 and MMBZ5231B are both 3.9V ±5% SOD-123F Zener diodes, but the MMBZ5231B typically exhibits lower reverse leakage (1 µA max @ 1V vs. 5 µA for the BZT52C3V9), making it more suitable for battery-powered devices where microamp-level leakage can impact standby current. In low-duty-cycle IoT sensors or always-on monitoring circuits, using the BZT52C3V9 without careful biasing may result in higher-than-expected power drain. If leakage is critical, consider adding a series FET switch to isolate the BZT52C3V9 or opt for the MMBZ5231B for better performance. Confirm long-term reliability under thermal cycling, as Diotec's process may vary from ON Semiconductor's MMBZ5231B in sustained reverse bias.
What risks arise when replacing a BZX84C3V9 with the BZT52C3V9 in an existing SOD-123 design?
Although the BZT52C3V9 and BZX84C3V9 are both 3.9V Zener diodes in similar SOD packages, the BZT52C3V9 uses the SOD-123F footprint, which has a slightly different pad layout and thermal pad configuration than the standard SOD-123. Substituting without reviewing the PCB footprint may cause insufficient solder joint formation or reduced thermal dissipation, especially under sustained 500mW load. Additionally, the BZT52C3V9 has higher dynamic impedance (up to 130Ω) than some BZX84 variants, potentially affecting regulation stability in feedback circuits. Always verify the land pattern per Diotec’s datasheet and simulate transient response before replacing the BZX84C3V9 with the BZT52C3V9 in precision or high-reliability designs.
What is the thermal derating curve for the BZT52C3V9, and how should I design the PCB to ensure reliable operation at 85°C ambient?
The BZT52C3V9 has a maximum power dissipation of 500mW at 25°C, but this must be derated linearly above that temperature, typically at 4mW/°C with no heatsink. At 85°C ambient, power capability drops to approximately 260mW, meaning you cannot sustain 10mA at 3.9V without risk of thermal runaway. To ensure reliability, design the PCB with adequate copper area (e.g., 100mm² of 1oz Cu) connected to both terminals, use thermal vias if possible, and avoid placing the BZT52C3V9 near other heat sources. For continuous operation near 300–400mW dissipation, consider using a larger package like SMAZ or parallel Zeners with ballast resistors to spread thermal load.
Can the BZT52C3V9 be used as a voltage reference in a precision ADC circuit, and what are the key limitations?
The BZT52C3V9 is not recommended as a precision voltage reference for ADC applications due to its ±5% initial tolerance, relatively high impedance (up to 130Ω), and significant temperature coefficient (typically ±3 mV/°C near 3.9V). These characteristics can introduce non-linearity and drift errors in ADC references, especially over -40°C to 85°C ranges. If used, buffer the BZT52C3V9 with a low-input-bias op-amp and stabilize current with a regulated bias source (e.g., constant current sink or stable resistor from 5V). For better accuracy, replace the BZT52C3V9 with a bandgap reference like the REF3033 or LT6655-3.3. Reserve the BZT52C3V9 for non-critical clamping or coarse regulation where cost is a primary constraint.
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