1N4100/TR

The Microchip Technology 1N4100/TR is a general-purpose, high-reliability silicon rectifier diode designed for low- to medium-current applications such as AC-to-DC conversion, voltage clamping, and signal rectification. It is housed in a DO-41 axial-lead package, providing robust mechanical protection, good thermal performance, and ease of through-hole PCB assembly. The "/TR" suffix indicates tape-and-reel packaging, which is suitable for automated pick-and-place assembly lines, improving manufacturing efficiency and handling reliability. The 1N4100/TR is suitable for industrial, commercial, and consumer electronics, providing predictable electrical performance, low forward voltage drop, and high surge current handling in a compact, cost-effective format.

## Electrical Characteristics

The 1N4100/TR is rated for a maximum repetitive peak reverse voltage (V_RRM) of 100 V, enabling safe operation in circuits with moderate reverse voltage conditions. The average forward current (I_F(AV)) is 1 A, allowing continuous conduction under normal thermal conditions. The non-repetitive peak surge current (I_FSM) is 30 A, supporting transient events such as power-on surges or short-term overloads without device failure.

The typical forward voltage drop (V_F) is 1.1 V at 1 A DC, which provides efficient conduction with minimal power loss. Reverse leakage current (I_R) is specified as a maximum of 5 µA at the rated reverse voltage, ensuring low standby losses and stable operation in circuits requiring minimal leakage. The diode exhibits stable forward and reverse behavior over its operating temperature range, with a thermal voltage coefficient of approximately 2 mV/°C, allowing predictable performance in temperature-sensitive applications.

## Switching Characteristics

While primarily intended for standard rectification, the 1N4100/TR provides sufficiently fast recovery for low- to moderate-frequency applications. Its reverse recovery time is short enough to support typical AC-to-DC rectifiers and clamping circuits without introducing significant switching losses. For higher-frequency or ultrafast switching applications, devices such as the 1N4100UR-1/TR with specialized recovery characteristics may be more appropriate.

## Thermal Characteristics

The 1N4100/TR is rated for a junction temperature (T_J) range of −65°C to +150°C, enabling operation in both industrial and harsh environmental conditions. The junction-to-ambient thermal resistance (R_thJA) is approximately 50 K/W in free-air conditions. Thermal considerations become critical at higher currents, and effective heat dissipation can be achieved through PCB copper area, airflow, or supplemental heatsinking. The glass DO-41 package contributes to thermal stability and mechanical robustness, maintaining junction reliability during continuous and surge operations.

## Package and Mechanical Information

The 1N4100/TR is housed in a standard DO-41 glass-encapsulated axial-lead package, with a cylindrical body approximately 2.6 mm in diameter and 5.2 mm in length. Axial leads have a nominal diameter of 0.8 mm, facilitating secure through-hole PCB soldering and mechanical reliability. The tape-and-reel packaging format supports automated manufacturing while ensuring consistent device orientation and minimal handling stress.

The hermetic glass encapsulation offers excellent protection against moisture, vibration, and mechanical shock. End-cap metallization ensures low-resistance electrical connection and facilitates heat transfer from the junction to the leads or PCB. The package design supports series or parallel configurations for higher voltage or current requirements without compromising reliability.

## Reliability and Environmental Compliance

The 1N4100/TR is engineered for long-term reliability, with high surge tolerance, low leakage, and planar silicon construction that reduces junction stress. It complies with RoHS standards, ensuring environmentally responsible manufacturing and disposal. Its glass encapsulation enhances resistance to humidity, thermal cycling, and mechanical shock, making it suitable for industrial, automotive, and consumer electronics applications.

## Applications

The 1N4100/TR is typically used in:

* Low- to medium-power AC-to-DC rectification
* Voltage clamping and transient suppression
* Freewheeling diodes in motor control circuits
* Signal rectification in analog or digital electronics
* Power conversion in industrial automation and consumer devices
* Lighting circuits and low-voltage rectification

Its combination of low forward voltage drop, high surge capability, and hermetic packaging makes it ideal for continuous rectification as well as transient handling applications.

## Performance Parameters Summary

* Maximum repetitive peak reverse voltage (V_RRM): 100 V
* Average forward current (I_F(AV)): 1 A
* Non-repetitive peak surge current (I_FSM): 30 A
* Forward voltage drop (V_F): 1.1 V at 1 A DC
* Reverse leakage current (I_R): max 5 µA at V_R = V_RRM
* Junction temperature range (T_J): −65°C to +150°C
* Thermal resistance, junction-to-ambient (R_thJA): 50 K/W
* Package: DO-41 glass-encapsulated axial-lead, tape-and-reel
* Lead diameter: 0.8 mm
* Environmental compliance: RoHS

## Design Considerations

Designers must consider thermal management when operating the diode at or near its maximum forward current. Power dissipation is determined by the product of forward voltage drop and current, and sufficient PCB copper area, airflow, or heatsinking can maintain safe junction temperatures. Peak transient currents must remain below the non-repetitive surge rating to avoid junction damage.

In circuits requiring higher frequency or fast switching, care must be taken to minimize parasitic inductance in PCB traces to avoid voltage overshoot and EMI. Parallel diode arrangements require current sharing considerations, and series connections may require voltage balancing resistors to ensure uniform stress distribution.

The low leakage current and stable forward voltage drop of the 1N4100/TR make it suitable for long-term reliable operation in AC-to-DC rectifiers, clamping circuits, and general-purpose low- to medium-current power applications.

## Summary

The Microchip Technology 1N4100/TR is a robust, general-purpose silicon rectifier diode offering reliable AC-to-DC conversion, voltage clamping, and signal rectification. Its low forward voltage drop, high surge capability, and glass-encapsulated DO-41 package provide long-term reliability across industrial, commercial, and consumer electronics applications. Tape-and-reel packaging ensures efficient automated assembly, while the device’s electrical and thermal characteristics support both continuous and transient operation, making it a versatile component for medium-current rectification circuits.