SC1548CSKTRT Equivalent & Substitute Parts

Part Overview

The SC1548CSKTRT is a Linear Regulator Controller IC manufactured by Semtech Corporation, designed for positive adjustable output applications in a compact SOT-23-5 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SmartLDO™ series controller provides single output regulation suitable for power management applications requiring adjustable voltage output.

Substiute Parts

SC1548CSKTRT

Semtech CorporationIn Stock: 4475SC1548CSKTRT Datasheet

Current PartRFQ

LT1575CS8#TRPBF

Linear TechnologyIn Stock: 5029LT1575CS8#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC1548CSKTRT is determined by the following critical parameters:

• Functional Type: Positive adjustable linear regulator controller with single output capability
• Supply Current: Maximum supply current rating of 1mA (SC1548CSKTRT) compared to substitute options
• Input Voltage Range: Operating input voltage window of 11.28V ~ 12.72V for the primary part
• Output Configuration: Single output requirement
• Package Compatibility: Surface mount technology with physical and electrical pin compatibility
• Operating Temperature Range: 0°C ~ 70°C specification
• Regulatory Compliance: ECCN EAR99 classification

The LT1575CS8#TRPBF from Linear Technology qualifies as a manufacturer-recommended substitute based on functional equivalence as a positive adjustable linear regulator controller with single output. However, key parameter differences exist that must be evaluated for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SC1548CSKTRT and LT1575CS8#TRPBF are classified as obsolete products. Selection between these parts must account for the following provided specifications:

Supply Current Differential: The LT1575CS8#TRPBF operates at 12mA supply current versus 1mA for the SC1548CSKTRT. This 12x increase in quiescent current consumption represents a significant design consideration for power-sensitive applications.

Input Voltage Range: The SC1548CSKTRT operates within a narrow 11.28V ~ 12.72V input window, while the LT1575CS8#TRPBF accepts a broader 5V ~ 22V input range. Applications requiring the narrower input specification of the original part may require circuit redesign to accommodate the substitute.

Package Footprint: The SC1548CSKTRT uses SOT-23-5 (SC-74A) packaging, while the LT1575CS8#TRPBF uses 8-SOIC packaging. PCB layout modifications are required for physical substitution.

Regulatory Compliance: Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, indicating equivalent export control and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the LT1575CS8#TRPBF directly replace the SC1548CSKTRT without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (SOT-23-5 versus 8-SOIC). PCB layout redesign is required. Additionally, the increased supply current (12mA vs. 1mA) and broader input voltage range may necessitate circuit adjustments depending on application requirements.

Q: What is the primary reason for seeking substitutes for the SC1548CSKTRT?

A: The SC1548CSKTRT is classified as obsolete. Substitute parts are required to maintain design continuity and ensure component availability for production and field support.

Q: Are there compatibility concerns with the input voltage specifications?

A: The SC1548CSKTRT operates within 11.28V ~ 12.72V, while the LT1575CS8#TRPBF accepts 5V ~ 22V. Applications designed for the narrow input window of the original part must verify that the substitute's broader range does not introduce unintended circuit behavior or require additional filtering or regulation stages.

Q: Do both parts share the same regulatory classification?

A: Yes. Both the SC1548CSKTRT and LT1575CS8#TRPBF carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, indicating equivalent export control and tariff treatment.

Q: What package considerations apply to substitution?

A: The SC1548CSKTRT uses SOT-23-5 (5-pin) packaging, while the LT1575CS8#TRPBF uses 8-SOIC (8-pin) packaging. Pin count and physical footprint differences require complete PCB redesign and schematic verification before implementation.