SC2608STRT Equivalent & Substitute Parts

Part Overview

The SC2608STRT is a buck regulator positive output step-down DC-DC controller IC manufactured by Semtech in 8-SOIC packaging. This device functions as a transistor driver for step-down topology applications with a single output phase. The SC2608STRT is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement.

Substiute Parts

SC2608STRT

SemtechIn Stock: 20373SC2608STRT Datasheet

Current PartRFQ

LTC3895IFE#TRPBF

Analog Devices Inc.In Stock: 9486LTC3895IFE#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC2608STRT is determined by functional equivalence across the following critical parameters:

• Topology & Function: Buck regulator controller with transistor driver output
• Output Configuration: Single output, positive polarity, single phase
• Supply Voltage Compatibility: Input voltage range must accommodate the original 4.5V ~ 14V specification
• Switching Frequency: Operating frequency must be compatible with system design requirements
• Duty Cycle: Maximum duty cycle capability must meet or exceed 90%
• Control Features: Enable, phase control, and soft start functionality
• Operating Temperature: Full -40°C ~ 125°C range support
• Synchronous Rectification: Integrated synchronous rectifier support
• Mounting & Package: Surface mount technology with compatible pinout and thermal characteristics

The LTC3895IFE#TRPBF qualifies as a substitute based on functional equivalence across all critical parameters, despite differences in package form factor and additional control features.

Parameter Comparison

Engineering Selection Recommendations

The LTC3895IFE#TRPBF is the qualified substitute for the obsolete SC2608STRT based on the following engineering criteria:

Functional Equivalence: Both devices implement identical buck regulator controller topology with transistor driver output, single output phase, and synchronous rectification. All critical control features present in the original design are supported by the substitute.

Electrical Compatibility: The LTC3895IFE#TRPBF supply voltage range (4V ~ 140V) fully encompasses the original specification (4.5V ~ 14V). Switching frequency is programmable within 50kHz ~ 900kHz, supporting the original 200kHz operation point. Maximum duty cycle of 100% exceeds the original 90% requirement.

Product Status & Support: The SC2608STRT is obsolete with no ongoing manufacturer support. The LTC3895IFE#TRPBF is actively manufactured by Analog Devices Inc., ensuring long-term availability and technical support.

Compliance & Certifications: The LTC3895IFE#TRPBF is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. Both devices share identical MSL ratings and operating temperature ranges.

Design Considerations: PCB layout redesign is required due to package form factor change from 8-SOIC to 38-TFSOP-EP. The substitute offers additional control features (current limit, frequency control, power good) that may enhance system functionality without compromising backward compatibility of core buck regulation operation.

Frequently Asked Questions (FAQ)

Q: Can the LTC3895IFE#TRPBF directly replace the SC2608STRT without PCB modifications?

A: No. The SC2608STRT uses 8-SOIC packaging while the LTC3895IFE#TRPBF uses 38-TFSOP-EP packaging. PCB layout redesign is required to accommodate the different pin configuration and package dimensions.

Q: Are the control features of the LTC3895IFE#TRPBF compatible with designs using the SC2608STRT?

A: Yes. The LTC3895IFE#TRPBF includes all control features present in the SC2608STRT (enable, phase control, soft start) plus additional features (current limit, frequency control, power good). Existing control logic can be maintained while additional features remain unused if not required by the application.

Q: What is the impact of the different supply voltage ranges?

A: The LTC3895IFE#TRPBF supports 4V ~ 140V input, which fully encompasses the SC2608STRT specification of 4.5V ~ 14V. This provides greater design flexibility for future applications without compromising compatibility with the original voltage specification.

Q: How does the programmable switching frequency of the LTC3895IFE#TRPBF compare to the fixed 200kHz of the SC2608STRT?

A: The LTC3895IFE#TRPBF offers programmable frequency from 50kHz to 900kHz, allowing the original 200kHz operation point to be configured. This provides design flexibility while maintaining compatibility with the original switching frequency requirement.

Q: Are there any compliance or regulatory differences between these devices?

A: The LTC3895IFE#TRPBF is ROHS3 compliant and REACH unaffected, meeting current environmental standards. The SC2608STRT compliance status is not specified. Both devices share identical MSL ratings and operating temperature ranges.

Q: What is the significance of the exposed pad in the LTC3895IFE#TRPBF package?

A: The exposed pad in the 38-TFSOP-EP package provides improved thermal dissipation compared to the 8-SOIC package. This enhances thermal performance and may allow operation at higher power levels or ambient temperatures.