AL1B

Overview

The Diotec Semiconductor AL1B is a standard avalanche SMD rectifier diode designed for general-purpose applications. It features a maximum average forward current (IFAV) of 1 A at 75°C and a peak forward surge current (IFSM) of 27 A at 50 Hz or 30 A at 60 Hz. The device has a repetitive peak reverse voltage (VRRM) of 100 V, with a typical junction capacitance of 4 pF. Forward voltage is less than 1.2 V at 1 A, while leakage current remains below 3 µA at 25°C and 50 µA at 125°C. The component operates within a junction temperature range of -50°C to +175°C.

Feature Summary

• Incorporates avalanche capability with a non-repetitive peak reverse avalanche energy rating of 20 mJ.
• Features low thermal resistance values of 75 K/W junction-to-ambient and 40 K/W junction-to-terminal.
• Provides high reliability through an extended operating junction temperature range up to +175°C.

Applications

• General-purpose rectification in commercial and industrial electronic circuits.
• Power supply input stages requiring standard recovery characteristics.
• Protection against transient voltage spikes due to avalanche rating.

Procurement Notes

Verify the specific package type and marking code against official Diotec documentation before ordering. Confirm compliance requirements such as RoHS status and REACH SVHC declarations directly from the manufacturer's datasheet. Ensure that the intended application does not exceed the specified thermal limits or require automotive-grade qualification, as this part is designated for standard commercial/industrial use.

Selection Notes

Select the AL1B when a 100 V blocking voltage and 1 A continuous current are required in a surface-mount configuration. Consider this component for designs needing avalanche ruggedness without the complexity of dedicated TVS devices. Evaluate the thermal management strategy based on the provided junction-to-ambient resistance values to ensure operation within the safe temperature range under expected load conditions.

Part Context

The AL1B belongs to the AL1A...AL1M series of Standard Avalanche SMD Rectifier Diodes produced by Diotec Semiconductor. This series offers various voltage ratings from 50 V to 1100 V, distinguished by color coding for identification. All variants share common electrical characteristics regarding current handling and thermal performance, providing a standardized solution for diverse voltage requirements in compact surface-mount designs.

Replacement Considerations

Direct substitutes must match the 100 V rating, 1 A current capacity, and DO-214AC (SMA) package. Verify that alternative components also possess avalanche capability if transient protection is required. Cross-reference thermal resistance and forward voltage specifications to ensure compatibility with existing circuit designs.