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High-reliability Zener diodes play a key role in power regulation, telecom systems, and industrial control. Both 1N2820B and 1N5550 are classic Zener diodes, but they differ in voltage rating, power handling, and intended applications.
? 1. Technical Comparison
Parameter 1N2820B 1N5550
Zener Voltage (Vz) 6.8V ± 5% 200V ± 10%
Max Power Dissipation 10W 5W
Operating Current Tens to hundreds of mA Few mA to tens of mA
Leakage Current (Ir) < 100μA < 20μA (@ Vr = 150V)
Package Type DO-4 (bolt-type) DO-5 (bolt-type)
Polarity Configuration Cathode to case Anode to case
Application Focus High-current clamping, power rails Precision high-voltage protection
? 2. Typical Application Scenarios
? Recommended Uses for 1N2820B:
Linear voltage regulator protection circuits
Industrial surge suppression (e.g., motor controllers)
Output voltage clamping in DC-DC converters
Battery charging constant-voltage control
? Recommended Uses for 1N5550:
High-voltage signal clamping circuits
Power input protection in telecom base stations
Precision high-voltage signal regulation
Voltage regulation in UPS or PLC systems
?️ 3. Thermal Design & Mounting Tips
Both devices feature bolt-style packages, allowing for direct heat sink mounting.
Use thermal grease or pads to ensure proper thermal conductivity.
For continuous operation near maximum power, design with at least 50% thermal margin (e.g., operate 10W parts at 6–7W typical).
?️ 4. Reliability and Alternatives
Durability: Both models are rated for military/industrial use, supporting high temp/humidity/surge conditions.
Alternatives:
Need higher breakdown voltage? ➜ Consider 1N5551 (400V)
Need higher power than 1N2820B? ➜ Use 1N2837B (12V, 15W)
Base your selection on Zener voltage (Vz), power dissipation (Ptot), and target circuit conditions:
For high current clamping ➜ Choose 1N2820B
For high-voltage precision regulation ➜ Choose 1N5550
Need datasheets, footprints, or bulk quote support? Visit Xecor’s official site for the latest resources and offers.
? 1. Technical Comparison
Parameter 1N2820B 1N5550
Zener Voltage (Vz) 6.8V ± 5% 200V ± 10%
Max Power Dissipation 10W 5W
Operating Current Tens to hundreds of mA Few mA to tens of mA
Leakage Current (Ir) < 100μA < 20μA (@ Vr = 150V)
Package Type DO-4 (bolt-type) DO-5 (bolt-type)
Polarity Configuration Cathode to case Anode to case
Application Focus High-current clamping, power rails Precision high-voltage protection
? 2. Typical Application Scenarios
? Recommended Uses for 1N2820B:
Linear voltage regulator protection circuits
Industrial surge suppression (e.g., motor controllers)
Output voltage clamping in DC-DC converters
Battery charging constant-voltage control
? Recommended Uses for 1N5550:
High-voltage signal clamping circuits
Power input protection in telecom base stations
Precision high-voltage signal regulation
Voltage regulation in UPS or PLC systems
?️ 3. Thermal Design & Mounting Tips
Both devices feature bolt-style packages, allowing for direct heat sink mounting.
Use thermal grease or pads to ensure proper thermal conductivity.
For continuous operation near maximum power, design with at least 50% thermal margin (e.g., operate 10W parts at 6–7W typical).
?️ 4. Reliability and Alternatives
Durability: Both models are rated for military/industrial use, supporting high temp/humidity/surge conditions.
Alternatives:
Need higher breakdown voltage? ➜ Consider 1N5551 (400V)
Need higher power than 1N2820B? ➜ Use 1N2837B (12V, 15W)
Base your selection on Zener voltage (Vz), power dissipation (Ptot), and target circuit conditions:
For high current clamping ➜ Choose 1N2820B
For high-voltage precision regulation ➜ Choose 1N5550
Need datasheets, footprints, or bulk quote support? Visit Xecor’s official site for the latest resources and offers.