SC4626ASKTRT Equivalent & Substitute Parts

Part Overview

The SC4626ASKTRT is a buck switching regulator IC manufactured by Semtech Corporation, designed for step-down voltage conversion with a fixed 1V output and 1A output current capability. This device is classified as not for new designs, indicating it has been superseded in Semtech's product portfolio. For applications requiring equivalent functionality, substitute parts from active product lines provide comparable performance with modern support and availability.

Substiute Parts

SC4626ASKTRT

Semtech CorporationIn Stock: 1510SC4626ASKTRT Datasheet

Current PartRFQ

ADP2108AUJZ-1.0-R7

Analog Devices Inc.In Stock: 1000128ADP2108AUJZ-1.0-R7 Datasheet

MFR RecommendedRFQ

RT8009-10GB

Richtek USA Inc.In Stock: 815RT8009-10GB Datasheet

MFR RecommendedRFQ

RT8009-10GJ5

Richtek USA Inc.In Stock: 2018RT8009-10GJ5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SC4626ASKTRT are selected based on the following critical parameters that determine functional equivalence:

• Fixed output voltage of 1V
• Buck topology with positive output configuration
• Input voltage range compatibility (minimum 2.9V to 5.5V maximum)
• Surface mount packaging in SOT-23-5 or equivalent form factor
• Synchronous rectifier topology
• Operating temperature range of -40°C to 125°C or better
• RoHS3 compliance and REACH unaffected status

The substitute parts identified operate within these constraints. However, output current ratings vary: the SC4626ASKTRT provides 1A, while substitute options deliver 600mA. This reduction in current capacity represents the primary design trade-off when selecting alternatives. Switching frequency differences (2.5MHz vs. 1.25MHz or 3MHz) affect efficiency and component sizing but do not prevent functional substitution in applications within the lower current envelope.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the SC4626ASKTRT. The primary selection criterion is product status: the ADP2108AUJZ-1.0-R7 and both RT8009 variants are active products with ongoing manufacturer support, whereas the SC4626ASKTRT is not recommended for new designs.

For applications requiring the full 1A output current of the SC4626ASKTRT, no direct substitute exists among the provided alternatives, as all substitutes are rated at 600mA maximum output. Design modifications or alternative component selection outside this substitute list may be necessary for 1A applications.

The ADP2108AUJZ-1.0-R7 offers the lowest minimum input voltage (2.3V) and highest switching frequency (3MHz), making it suitable for low-input-voltage applications and designs prioritizing compact magnetics. The RT8009 variants provide lower switching frequency (1.25MHz), which may reduce EMI in noise-sensitive applications but requires larger filter components.

Moisture sensitivity differs: the SC4626ASKTRT and ADP2108AUJZ-1.0-R7 carry MSL 1 (unlimited shelf life), while RT8009 variants carry MSL 3 (168-hour limit), affecting storage and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the SC4626ASKTRT be directly replaced with a 600mA substitute in a 1A application?

A: No. Direct replacement is not possible if the application requires sustained 1A output current. The substitute parts are rated for 600mA maximum. Applications must be redesigned to operate within the 600mA envelope or alternative components must be sourced.

Q: Are the package dimensions identical between SC-74A and TSOT-23-5 variants?

A: Both are SOT-23-5 form factors but differ in thickness. SC-74A (SOT-753) is standard thickness; TSOT-23-5 is thin profile. PCB layout and component clearances must be verified for each variant. The ADP2108AUJZ-1.0-R7 and RT8009-10GJ5 use thin profile packaging.

Q: What is the impact of switching frequency differences on circuit design?

A: The SC4626ASKTRT operates at 2.5MHz, while substitutes range from 1.25MHz to 3MHz. Higher frequency (3MHz, ADP2108AUJZ-1.0-R7) reduces inductor and capacitor sizes but increases switching losses. Lower frequency (1.25MHz, RT8009 variants) increases component sizes but reduces EMI. Filter component values must be recalculated for each substitute.

Q: Are there storage or handling differences between these parts?

A: Yes. The SC4626ASKTRT and ADP2108AUJZ-1.0-R7 have MSL 1 (unlimited shelf life). The RT8009 variants have MSL 3, requiring storage below 30°C and 60% relative humidity, with a 168-hour floor life limit after moisture exposure. Handling procedures must reflect these differences.

Q: Which substitute is recommended for new designs?

A: All three substitute parts are active products. The ADP2108AUJZ-1.0-R7 is recommended for new designs requiring the lowest input voltage threshold (2.3V) and highest switching frequency. The RT8009 variants are suitable for applications prioritizing lower switching frequency and EMI reduction.

Q: Can operating temperature differences affect substitution?

A: The SC4626ASKTRT operates to 125°C (junction temperature). The ADP2108AUJZ-1.0-R7 also reaches 125°C (ambient temperature). The RT8009 variants are limited to 85°C (ambient temperature). For high-temperature applications, the ADP2108AUJZ-1.0-R7 is the appropriate choice.