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Hey guys, this is Bob, in today's blog we'll discuss the difference between 1N4148, 1N4007, 1N5819. I. Brief Introduction to 1N4148, 1N4007, 1N5819 1N4148 is a fast switching diode. It is fabricated in planar technology, and encapsulated in hermetically sealed leaded glass SOD27 (DO-35) packages. 1n4007 is a PN junction rectifier diode. These types of diodes allow only the flow of electrical current in one direction only. So, it can be used for the conversion of AC power to DC. 1N5819 is a Schottky diode with 2 pins, a peak current of 25A, and an operating temperature range of -65°C~ +125°C. It is commonly used in high frequency applications like Inverters, DC-DC converters etc. II. 1N4148 vs 1N4007 General difference 1. 1N4148 and 1N4007 can be replaced with each other in case of general small current (below 100mA, reverse voltage below 100V) and unimportant occasions. 2. 1N4148 is a small current switch tube, with a voltage resistance of 100V. 3. 1N4007 is a rectifier tube, 1A-1000V. There are many types of substitute models. Application difference Generally speaking, we mostly use 1n4148 when using freewheeling diodes; Since it is a freewheeling diode, it is generally used on inductive loads, such as: buzzer, relay; Several factors we have to consider are: 1. How fast is the freewheeling diode? Just take an appropriate value; for example, MS level, US level, NS level? 2. What is the current of the freewheeling diode? Look at the DS manual, don't burn it out. 3. How high is the voltage of the freewheeling diode? Look at the DS manual, don't break it. Conclusion 1N4148: 100V reverse withstand voltage and 150mA average forward current, very suitable for ordinary rectification in general occasions. The reverse recovery time of 4nS is sufficient for most occasions. 1N4007: Maximum forward average rectified current, 1A maximum reverse withstand voltage, 1000V low reverse leakage current, 5uA (maximum) forward voltage drop, 1.0V maximum reverse peak current, 30uA, reverse recovery time 30us; 1N4148: Generally, IN4148 is used in weak current inductive loads, such as buzzer and other small current inductive loads; 1N4007: Generally used in large current loads, such as industrial load (relay), power supply load; The biggest difference between them is the current, voltage, and response speed. In a sense, 1N4007 can replace 1N4148, as long as the response speed is not too demanding, 1N4148 is destined to be used only on weak current low-current inductive loads. III. 1N4148 vs 1N5819 High frequency, low voltage, and high current characteristics are the differences between 1N5819 diodes and ordinary diodes. It is widely used in switching power supplies, frequency converters, drivers and other circuits for high frequency, low voltage, high current rectification, freewheeling, and diode protection. 1N5819 is characterized by ultra-fast speed (low switching loss), extremely low forward voltage drop (low voltage loss), but also low reverse withstand voltage, usually less than 60V, suitable for low-voltage (no higher than 12V) switching power supply. Another use of 1N5819 diode is to use its reverse characteristic to stabilize voltage. Therefore, when the withstand voltage is low and the current is not large, you can consider using a Zener tube instead. 1N4148 is a point contact type low current high frequency switching diode with high speed, but the working current is only 150mA, which is widely used in circuits with higher signal frequencies. The reverse leakage of 1N5819 tube is relatively large, but it has the characteristics of small capacitance and high speed. But it is not as fast as 1N4148, after all, the purpose of 1N4148 is high frequency detection, not rectification.