Overview
The 1N4148T-72 diode, produced by Rohm Semiconductor, is a silicon epitaxial planar diode known for its fast switching speed and reliability. It belongs to the family of silicon switching diodes and is widely used in various electronic circuits requiring high-speed switching and signal processing. The diode is particularly suited for applications in high-frequency circuits, digital logic gates, and protection circuits due to its rapid recovery time and robust electrical characteristics.
Key Specifications
| Parameter | Rating | Conditions |
|---|---|---|
| Peak Reverse Voltage (VRRM) | 100 V | Maximum |
| Forward Continuous Current (IF) | 300 mA | @ 25°C |
| Peak Forward Surge Current (IFSM) | 2 A | Pulse width ≤ 1 μs |
| Forward Voltage Drop (VF) | 1 V | @ IF = 10 mA |
| Reverse Current (IR) | 25 nA | @ VR = 20 V |
| Reverse Recovery Time (trr) | 4 ns | Typically |
| Operating Temperature Range | -65°C to +175°C | |
| Diode Capacitance (CD) | 4 pF | @ VR = 0 V, f = 1 MHz |
Key Features
- Fast Switching Speed: The 1N4148T-72 diode has a reverse recovery time of approximately 4 nanoseconds, making it ideal for high-speed switching applications.
- Low Forward Voltage Drop: It exhibits a low forward voltage drop of 1V at 10mA, which is beneficial for small-signal applications requiring precise voltage control.
- High Voltage and Current Ratings: The diode can handle reverse voltages up to 100V and forward currents up to 300mA, making it suitable for moderate power applications.
- Low Leakage Current: It has a very low leakage current in reverse-bias mode, which is crucial for maintaining signal integrity in precision analog circuits and sensor applications.
- Compact Package: The diode is available in a small DO-35 glass package, which is convenient for compact designs and PCBs with limited space.
- Wide Temperature Range: The diode operates over a wide temperature range of -65°C to +175°C, making it suitable for harsh environments such as automotive and industrial settings.
- High Reliability and Availability: The 1N4148T-72 is a long-established component with high reliability and wide availability, making it a preferred choice for long-term projects.
Applications
- Signal Processing and Rectification: The diode excels in signal processing applications due to its fast switching characteristics and low forward voltage drop. It is used in rectification circuits to convert AC signals into DC current efficiently.
- Logic Gate Implementation: It is used in digital circuits to implement logic gates, particularly in diode-transistor logic (DTL) and diode-logic systems.
- Protection Circuits: The diode is used in protection circuits to safeguard sensitive components from voltage spikes and reverse current, ensuring the longevity and reliability of protected devices.
- High-Frequency Circuits: It is suitable for high-frequency operations up to 100MHz, making it ideal for applications such as pulse generators, frequency mixers, and radio frequency (RF) circuits.
Q & A
- What is the typical reverse recovery time of the 1N4148T-72 diode?
The typical reverse recovery time is approximately 4 nanoseconds.
- What is the maximum forward continuous current rating of the 1N4148T-72 diode?
The maximum forward continuous current rating is 300 mA at 25°C.
- What is the peak forward surge current capability of the 1N4148T-72 diode?
The peak forward surge current capability is 2 A for a pulse width of 1 μs.
- What is the typical forward voltage drop of the 1N4148T-72 diode at 10 mA forward current?
The typical forward voltage drop is 1 V at 10 mA forward current.
- What is the operating temperature range of the 1N4148T-72 diode?
The operating temperature range is -65°C to +175°C.
- What is the diode capacitance of the 1N4148T-72 diode?
The diode capacitance is 4 pF at VR = 0 V and f = 1 MHz.
- What are some common applications of the 1N4148T-72 diode?
Common applications include signal processing, logic gate implementation, protection circuits, and high-frequency circuits.
- Why is the 1N4148T-72 diode preferred in high-speed switching applications?
It is preferred due to its fast switching speed, low forward voltage drop, and high reliability.
- What is the package type of the 1N4148T-72 diode?
The diode is packaged in a DO-35 glass case, suitable for through-hole mounting.
- How does the 1N4148T-72 diode protect against voltage spikes?
The diode protects against voltage spikes by acting as a barrier to reverse voltages, safeguarding sensitive components from overvoltage conditions.
