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SC2608BSTRT Buck Regulator Controller Equivalent & Substitute Parts
Part Overview
The SC2608BSTRT is a buck regulator positive output step-down DC-DC controller IC manufactured by Semtech Corporation in 8-SOIC packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SC2608BSTRT operates as a transistor driver with single-output, single-phase buck topology, suitable for applications requiring step-down voltage regulation with supply voltages between 4V and 14V.
Substiute Parts
Key Parameters
| Parameter | SC2608BSTRT |
|---|---|
| Manufacturer | Semtech Corporation |
| Product Status | Obsolete |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Voltage - Supply (Vcc/Vdd) | 4V ~ 14V |
| Frequency - Switching | 250kHz |
| Duty Cycle (Max) | 85% |
| Output Type | Transistor Driver |
| Function | Step-Down |
| Output Configuration | Positive |
| Topology | Buck |
| Number of Outputs | 1 |
| Output Phases | 1 |
| Synchronous Rectifier | Yes |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the SC2608BSTRT are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
- Package compatibility: 8-SOIC form factor (0.154", 3.90mm Width) for direct PCB layout compatibility
- Functional equivalence: Buck topology with positive output, single-phase, single-output configuration
- Output type: Transistor driver for gate drive applications
- Synchronous rectifier: Presence of integrated synchronous rectification capability
- Supply voltage range: Overlap or extension of the 4V ~ 14V input range
- Switching frequency: Operating frequency suitable for buck controller applications
- Duty cycle capability: Maximum duty cycle rating of 85% or higher
- Operating temperature range: Support for industrial or extended temperature specifications
The substitute parts are grouped into two categories based on these criteria:
Group 1 - Direct Package Substitutes (8-SOIC): ISL6520ACBZ, ISL6520ACBZ-T, ISL8105AIBZ, ISL8105AIBZ-T, ISL8105IBZ, ISL8105IBZ-T. These parts maintain the 8-SOIC package and meet core functional requirements with variations in supply voltage range, switching frequency, and control features.
Group 2 - Alternative Package: LTC3895IFE#TRPBF operates in 38-TSSOP-EP packaging, representing a different form factor and is included for applications where package migration is acceptable.
Parameter Comparison
| Parameter | SC2608BSTRT | ISL6520ACBZ | ISL6520ACBZ-T | ISL8105AIBZ | ISL8105AIBZ-T | ISL8105IBZ | ISL8105IBZ-T |
|---|---|---|---|---|---|---|---|
| Manufacturer | Semtech | Intersil | Renesas | Renesas | Renesas | Renesas | Renesas |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Voltage - Supply (Vcc/Vdd) | 4V ~ 14V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 6.5V ~ 14.4V | 6.5V ~ 14.4V | 6.5V ~ 14.4V | 6.5V ~ 14.4V |
| Frequency - Switching | 250kHz | 300kHz | 300kHz | 600kHz | 600kHz | 300kHz | 300kHz |
| Duty Cycle (Max) | 85% | 100% | 100% | 100% | 100% | 100% | 100% |
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver |
| Function | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down |
| Output Configuration | Positive | Positive | Positive | Positive | Positive | Positive | Positive |
| Topology | Buck | Buck | Buck | Buck | Buck | Buck | Buck |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Phases | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Synchronous Rectifier | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40°C ~ 125°C (TJ) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | Not specified | 1 (Unlimited) | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) |
| RoHS Status | Not specified | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
For applications within 4.5V to 5.5V supply range: ISL6520ACBZ or ISL6520ACBZ-T are active alternatives. ISL6520ACBZ-T includes ROHS3 compliance certification and is available in Cut Tape and Digi-Reel packaging. Operating temperature range is limited to 0°C ~ 70°C, suitable for commercial-grade applications.
For applications within 6.5V to 14.4V supply range: ISL8105 series parts (ISL8105AIBZ, ISL8105AIBZ-T, ISL8105IBZ, ISL8105IBZ-T) are active alternatives with extended supply voltage coverage. All ISL8105 variants include ROHS3 compliance and REACH unaffected status. Operating temperature range extends to -40°C ~ 85°C, supporting industrial applications. ISL8105AIBZ-T and ISL8105IBZ-T are available in Tape & Reel packaging with higher inventory levels (1700 and 10200 units respectively).
For applications requiring extended operating temperature to 125°C: The SC2608BSTRT original specification supports -40°C ~ 125°C junction temperature. Among active substitutes, none match this full temperature range. ISL8105 series supports -40°C ~ 85°C ambient temperature, which may be insufficient for high-temperature junction applications.
Compliance considerations: ISL6520ACBZ-T and all ISL8105 variants are ROHS3 compliant with REACH unaffected status, meeting modern regulatory requirements. Moisture sensitivity levels vary; ISL6520ACBZ-T and ISL8105 series specify MSL 1 or MSL 3 ratings respectively.
Frequently Asked Questions (FAQ)
Q: Can ISL6520ACBZ directly replace SC2608BSTRT in all applications?
A: ISL6520ACBZ maintains 8-SOIC package compatibility and buck controller functionality. However, the supply voltage range is restricted to 4.5V ~ 5.5V compared to SC2608BSTRT's 4V ~ 14V range. Operating temperature is limited to 0°C ~ 70°C versus the original's -40°C ~ 125°C. Substitution is valid only for applications operating within these narrower specifications.
Q: What are the key differences between ISL8105AIBZ and ISL8105IBZ?
A: Both parts share identical electrical specifications: 6.5V ~ 14.4V supply voltage, 100% maximum duty cycle, and -40°C ~ 85°C operating temperature. The primary difference is switching frequency: ISL8105AIBZ operates at 600kHz while ISL8105IBZ operates at 300kHz. Packaging options differ (Tube versus Tube), and inventory availability varies. Selection depends on application frequency requirements and packaging preferences.
Q: Are ISL8105AIBZ-T and ISL8105IBZ-T interchangeable?
A: Both parts are available in Tape & Reel packaging and share identical electrical specifications except for switching frequency (600kHz versus 300kHz). They are functionally interchangeable in applications where the frequency difference is acceptable. ISL8105IBZ-T has significantly higher inventory (10200 units) compared to ISL8105AIBZ-T (1700 units).
Q: Does the SC2608BSTRT's 85% maximum duty cycle limit substitution options?
A: All substitute parts support 100% maximum duty cycle, which exceeds the original specification. This represents an enhancement rather than a limitation. Applications designed for 85% duty cycle operation will function correctly with 100% duty cycle-capable substitutes.
Q: What is the impact of different switching frequencies on substitution?
A: SC2608BSTRT operates at 250kHz. ISL6520 series operates at 300kHz, while ISL8105AIBZ operates at 600kHz and ISL8105IBZ operates at 300kHz. Switching frequency affects output filter design, EMI characteristics, and efficiency. Applications must be re-evaluated for filter component compatibility when substituting parts with different switching frequencies.
Q: Are there supply voltage range gaps between substitute options?
A: ISL6520ACBZ covers 4.5V ~ 5.5V, while ISL8105 series covers 6.5V ~ 14.4V. Applications requiring operation between 5.5V and 6.5V cannot be directly served by these substitutes. The original SC2608BSTRT's 4V ~ 14V range provides continuous coverage that substitute parts do not collectively replicate.
Q: What packaging options are available for ISL8105 substitutes?
A: ISL8105AIBZ and ISL8105IBZ are supplied in Tube packaging. ISL8105AIBZ-T and ISL8105IBZ-T are supplied in Tape & Reel packaging. ISL6520ACBZ-T is supplied in Cut Tape and Digi-Reel packaging. Packaging selection affects handling, storage, and automated assembly compatibility.
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