S-102T

Overview

The Semitec USA Corp S-102T is a surface-mount current regulating diode (CRD) designed to maintain a constant current flow despite voltage fluctuations. It operates within a wide voltage range from less than 1V to 100V and delivers a typical pinch-off current of 1.0 mA at 10V, with a minimum of 0.88 mA and maximum of 1.3 mA. The device features a rated power of 500 mW and a maximum rated voltage of 100 V. It functions reliably across an operating temperature range of -40°C to +150°C, with a junction temperature limit of 150°C. The component utilizes a 2-SMD flat lead package for surface mount technology applications.

Feature Summary

• Maintains constant current output regardless of applied voltage, load resistance changes, or ripple voltage variations
• Requires only a single component to establish a constant current circuit, simplifying design complexity
• Provides stable performance over a wide operating temperature range suitable for demanding environments

Applications

• Constant current source for LED brightness stabilization in street lights and bulbs
• Battery charge and discharge circuits
• Proximity sensor constant current sources
• Telecommunications line interface protection
• Current source for piezoelectric actuators

Procurement Notes

Verify the specific ordering suffix corresponds to the required taping method, as 'T' indicates SMD reel taping. Confirm that the selected part number aligns with the desired pinch-off current rating of 1.0 mA. Ensure compatibility with the recommended mounting pad dimensions specified for the S series components to guarantee proper soldering and thermal performance during assembly.

Selection Notes

Select this component when a simple, single-part solution is needed for constant current regulation without complex circuitry. Consider the 500 mW power rating and 100 V maximum voltage limits when designing for higher power or voltage scenarios. Evaluate the temperature coefficient range of -0.10% to -0.37% per degree Celsius if precise current stability across varying temperatures is critical for the application.

Part Context

The S-102T belongs to the S series of current regulating diodes from Semitec, which are surface-mount variants of the axial E series. This series is engineered for compact designs where space is limited. The S series shares similar electrical characteristics with the E series but offers advantages in automated assembly processes due to its SMD packaging format, facilitating integration into modern printed circuit board manufacturing workflows.

Replacement Considerations

The E-102 is the axial leaded equivalent within the same product family. When substituting, verify that the PCB layout accommodates the different package type and that the thermal and mechanical constraints of the new component meet the design requirements.