STCS1APHR

Overview

The STCS1APHR is a BiCMOS constant current LED driver IC from STMicroelectronics, designed to replace discrete solutions in low-voltage applications. It operates within an input voltage range of 4.5 V to 40 V and delivers up to 1.5 A output current with ±10% precision. The device features a dedicated PWM dimming pin for control and supports both boost and buck topologies. It includes an open-drain diagnostic pin for load disconnection detection and a shutdown function. Operating temperatures span from -40°C to +150°C TJ, housed in a PowerSO-8 surface-mount package.

Feature Summary

• Provides precise constant current regulation up to 1.5 A with minimal voltage overhead.
• Supports external PWM dimming via a dedicated pin for light control.
• Includes diagnostic capabilities through an open-drain pin for detecting LED disconnection.
• Integrates shutdown functionality to reduce power consumption when inactive.

Applications

• LED driving in 5 V, 12 V, or 24 V systems
• Low voltage lighting applications requiring high precision
• Industrial and automotive LED modules

Procurement Notes

Verify the specific suffix 'H' indicates the reel packaging configuration as per manufacturer standards. Confirm RoHS3 compliance and MSL level 1 status during sourcing. Ensure the PowerSO-8 footprint matches your PCB design constraints. Cross-reference the DigiKey part number 497-6915-2-ND for availability checks. Validate that the 30-week production lead time aligns with your project schedule before finalizing orders.

Selection Notes

Select this component when replacing discrete LED drivers with a single-chip solution for improved reliability and precision. It is suitable for designs requiring adjustable current settings via an external resistor. Consider the 40 V maximum input rating for compatibility with standard low-voltage rails. The integrated PWM dimming simplifies control circuitry compared to analog alternatives. Ensure thermal management supports the 150°C junction temperature limit in enclosed environments.

Part Context

The STCS1APHR belongs to the STCS1A family of constant current LED drivers. This series targets low-voltage LED applications where space and component count are critical. The device integrates internal switching elements for boost and buck operations, eliminating the need for external inductors in some configurations. It represents a shift toward highly integrated power management solutions for modern lighting systems.

Replacement Considerations

Direct substitutes include other parts within the STCS1A family with compatible pinouts and electrical characteristics. Verify equivalent current ratings and input voltage ranges when considering alternative manufacturers. Check for identical package dimensions to ensure mechanical compatibility without PCB redesign.

FAQ

How is the output current adjusted?

The output current is set using an external resistor connected to the device, allowing for precise adjustment up to 1.5 A with ±10% accuracy.

What diagnostic features are included?

The IC provides an open-drain output pin that signals if the LED load is disconnected, facilitating system monitoring and fault detection.

Can the device support dimming?

Yes, a dedicated pin allows for PWM dimming control, enabling precise brightness adjustment without affecting the constant current regulation.