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BZT52C27
Diotec Semiconductor
ZENER SOD-123F 27V 0.5W 5%
53351 Pcs New Original In Stock
Zener Diode 27 V 500 mW ±5% Surface Mount SOD-123F
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5.0 / 5.0
- (426 Ratings)
BZT52C27
Product Overview
12944998
DiGi Electronics Part Number
BZT52C27-DGManufacturer
Diotec Semiconductor
BZT52C27
Description
ZENER SOD-123F 27V 0.5W 5%Inventory
53351 Pcs New Original In Stock
Zener Diode 27 V 500 mW ±5% Surface Mount SOD-123F
Quantity
Minimum 1
Minimum 1
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BZT52C27 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
27 V
Tolerance
±5%
Power - Max
500 mW
Impedance (Max) (Zzt)
70 Ohms
Current - Reverse Leakage @ Vr
100 nA @ 21 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
BZT52C27-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-BZT52C27TR
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
이곳은 품질과 가격이 모두 뛰어나서 계속 구매하고 싶어요.
Dec 02, 2025
La qualité constante des composants que j’ai reçus me donne confiance pour tous mes futurs projets.
Dec 02, 2025
The company’s diverse products exemplify their ability to innovate across categories.
Dec 02, 2025
The sturdy packaging gives me confidence in their products’ durability and value.
Dec 02, 2025
Their fast shipping has made a positive difference in my business operations.
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Frequently Asked Questions (FAQ)
When designing a voltage clamping circuit for a 24V automotive sensor input, what are the key thermal and power dissipation risks when using the BZT52C27 given its 500mW rating and 70Ω impedance?
The BZT52C27 has a 500mW absolute maximum power dissipation in a SOD-123F package. In a 24V automotive system, the nominal voltage can surge to 36V or more during load dump. At 27V clamp, the series current-limiting resistor must be sized to keep power below 400mW for derating. With 70Ω dynamic impedance, a 10mA change in current causes a 0.7V shift in clamp voltage, affecting precision. For reliable operation, calculate resistor value so worst-case input voltage yields I_z ≤ 15mA. Use PCB copper area under the SOD-123F to improve heat spreading, as the junction-to-ambient thermal resistance is typically >200°C/W without proper layout.
Can the BZT52C27 directly replace an MMSZ5257B (27V, 500mW) in an existing power supply feedback loop, and what layout or impedance differences should I consider?
Yes, the BZT52C27 can replace the MMSZ5257B electrically since both are 27V ±5%, 500mW Zener diodes. However, the BZT52C27 uses the SOD-123F package, which has a different footprint than the SOD-123 of the MMSZ5257B. The SOD-123F has a slightly smaller body size and different lead termination, which may affect solder joint reliability if pad dimensions are not adjusted. Electrically, the BZT52C27 specifies 70Ω maximum Zzt versus the MMSZ5257B’s 23Ω typical, so feedback loop stability may degrade if the circuit depends on low dynamic impedance. Verify the operating current; if the original design ran the Zener at >5mA, the higher impedance could increase output voltage ripple.
I need a 27V Zener for overvoltage protection on a 3.3V I/O line powered from a 24V industrial supply. Is the BZT52C27 suitable, or should I consider a higher-power or lower-leakage alternative?
The BZT52C27 is not ideal for protecting 3.3V I/O lines. Its 27V breakdown is far above the 3.3V logic threshold, so it will not clamp until destructive voltages already exceed the I/O's absolute maximum rating (typically 5V). For this application, consider a Zener in the 3.6V to 5.1V range, such as the BZT52C3V6 or a TVS diode. The BZT52C27’s 100nA reverse leakage at 21V is excellent for low-power systems, but its high clamp voltage offers no protection to low-voltage logic. If you must use the 27V for a higher rail, place a series resistor and a low-voltage clamping device downstream to protect the I/O.
What failure mechanisms should I anticipate when using the BZT52C27 in a high-temperature environment (125°C ambient) with continuous 400mW dissipation, and how can I mitigate them?
At 125°C ambient, the BZT52C27’s maximum junction temperature is 150°C, leaving only 25°C of headroom. With 400mW dissipation, the junction-to-ambient thermal resistance must be ≤62.5°C/W to stay below 150°C. A typical SOD-123F on a minimal PCB exceeds 200°C/W, leading to immediate thermal runaway. Mitigation: use a larger copper pad (≥25mm²) under the cathode, add thermal vias to a ground plane, and derate power to ≤200mW. Also note that Zener voltage and leakage current increase with temperature; at 125°C, leakage can rise by an order of magnitude, potentially causing instability in precision circuits. Active derating is mandatory for reliability.
For a battery-backed memory circuit where 27V is needed for programming, but the supply varies from 0V to 30V, how do I ensure the BZT52C27 does not conduct during normal operation and cause battery drain?
The BZT52C27 has a maximum reverse leakage of 100nA at 21V, which is acceptable for most battery-backed circuits. However, when the supply voltage rises above 27V, the Zener starts conducting. To prevent battery drain, place the BZT52C27 in series with a blocking diode (e.g., 1N4148) from the battery to the programming voltage input. Alternatively, use the Zener as a shunt regulator with a series resistor sized so that when the supply is at 30V, the current through the Zener stays below 2mA during programming, and the reverse leakage from the battery path is isolated with a Schottky diode. The SOD-123F’s low profile aids in compact layouts, but verify the reverse voltage rating of the blocking diode exceeds 30V.
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BZT52C27 CAD Models
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