S-153T

Overview

The Semitec S-153T is a surface-mount current regulating diode (CRD) designed to maintain a constant current flow despite voltage fluctuations. It belongs to the S series, which features a rated power of 500 mW and an operating temperature range from -40°C to +150°C. The device provides a typical pinch-off current of 15.0 mA at 10 V, with a minimum of 12.0 mA and a maximum of 18.0 mA. The limiting current ratio (I100V/Ip) is specified between 0.8 and 1.1. It supports a maximum rated voltage of 100 V for pulse waves and has an allowable reverse current of 50 mA.

Feature Summary

• Maintains constant current over a wide voltage range from less than 1V to 100V
• Single-component solution replacing multi-part constant current circuits
• SMD reel taping option available for automated assembly

Applications

• Constant current source for LED brightness stabilization
• Battery charge and discharge circuits
• Current source for piezoelectric actuators
• Telecommunications line interface
• Earth leakage circuit breakers

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging type. The 'T' suffix indicates SMD reel taping. Confirm that the required quantity aligns with the standard minimum taping quantity of 3000 pieces for SMD types. Ensure the application environment stays within the -40°C to +150°C operating range to guarantee performance stability.

Selection Notes

Select the S-153T when a nominal 15 mA constant current is required in a surface-mount design. Consider the 500 mW power rating and ensure adequate thermal management if ambient temperatures approach the upper limit. For applications requiring higher currents, multiple CRDs can be used in parallel. Verify that the system voltage does not exceed the 100 V maximum rated voltage.

Part Context

The S-153T is part of Semitec's S series of current regulating diodes, which are surface-mount variants of the E series axial components. This series is characterized by a 500 mW power rating and a wider operating temperature range compared to the older E series. The S series utilizes a compact SMD package suitable for modern automated PCB assembly processes.

Replacement Considerations

The axial E-153 is the direct leaded equivalent. Other manufacturers offer similar CRDs, but verify pinch-off current tolerance and voltage ratings carefully. When substituting, ensure the replacement component meets the 500 mW power dissipation requirement and operates within the same temperature range.