Texas Instruments

PT78ST105S

PT78ST105S Description

The PT78ST105S from Texas Instruments is a high-efficiency DC-DC converter designed for industrial and commercial applications. This single-output module delivers a stable 5V output with a maximum current of 1.5A, making it suitable for powering low-voltage digital systems. With an input voltage range of 9V to 38V, it accommodates a wide variety of power sources, including automotive and industrial power supplies. The converter boasts an impressive 85% efficiency, minimizing energy loss and heat generation. Housed in a compact surface-mount package (23.9mm x 22.9mm x 8.6mm), it is ideal for space-constrained designs. Although marked as Obsolete, it remains a reliable choice for legacy systems due to its robust performance and compliance with ROHS3 and REACH standards.

PT78ST105S Features

• Wide Input Range (9V–38V): Supports flexible power sourcing in harsh environments.
• High Efficiency (85%): Reduces thermal stress and improves energy savings.
• Integrated Protections: Features Over-Temperature Protection (OTP) and Short-Circuit Protection (SCP) for enhanced reliability.
• Compact & Lightweight: Surface-mountable design saves PCB space.
• Commercial-Grade: Suitable for ITE (Commercial) applications with EAR99 and HTSUS 8504.40.9580 compliance.
• Stable Output: Delivers a precise 5V/1.5A output with low ripple.

PT78ST105S Applications

The PT78ST105S is optimized for:

• Industrial Automation: Powering sensors, controllers, and PLCs in 24V systems.
• Telecommunications: Backup power for networking equipment with wide input tolerances.
• Automotive Electronics: Auxiliary power for infotainment or diagnostic tools.
• Legacy Systems: Maintenance and repair of older commercial devices requiring a discontinued but dependable power solution.

Conclusion of PT78ST105S

The PT78ST105S stands out for its wide input range, high efficiency, and robust protections, making it a versatile choice for demanding applications. While obsolete, its compliance with modern environmental standards (ROHS3/REACH) and compact form factor ensure continued relevance in legacy and niche markets. Engineers seeking a reliable, space-efficient DC-DC converter for industrial or commercial use will find this module a compelling option.