SC4518ISTRT Equivalent & Substitute Parts

Part Overview

The SC4518ISTRT is a buck switching regulator IC manufactured by Semtech Corporation, designed for positive adjustable step-down voltage regulation with a 2A output capacity. This device operates across a 3V to 16V input range and delivers adjustable output from 1.2V to 13.6V in an 8-SOIC surface mount package with exposed pad.

The SC4518ISTRT is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

SC4518ISTRT

Semtech CorporationIn Stock: 2054SC4518ISTRT Datasheet

Current PartRFQ

AOZ1284PI

Alpha & Omega Semiconductor Inc.In Stock: 18386AOZ1284PI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC4518ISTRT is determined by the following critical parameters:

• Topology & Function: Buck switching regulator with positive adjustable output
• Package Compatibility: 8-SOIC (0.154", 3.90mm Width) Exposed Pad surface mount
• Output Configuration: Single positive adjustable output
• Operating Temperature Range: -40°C ~ 85°C (TA)
• Electrical Compatibility: Input voltage range, output voltage range, and output current capacity must meet or exceed application requirements

The AOZ1284PI from Alpha & Omega Semiconductor Inc. qualifies as a substitute based on matching topology, package form factor, output configuration, and operating temperature range. The substitute part provides enhanced electrical specifications including higher input voltage tolerance, lower minimum output voltage, higher maximum output voltage, and increased output current capacity.

Parameter Comparison

Engineering Selection Recommendations

The AOZ1284PI is a direct substitute for the SC4518ISTRT based on identical package form factor, matching topology, and compatible operating temperature range. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity compared to the obsolete SC4518ISTRT.

The AOZ1284PI provides enhanced electrical specifications across all critical parameters: higher maximum input voltage (36V vs. 16V), lower minimum output voltage (0.8V vs. 1.2V), higher maximum output voltage (30.6V vs. 13.6V), and increased output current capacity (4A vs. 2A). These enhanced specifications ensure the substitute part can support applications designed for the original component without performance degradation.

The AOZ1284PI carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. The substitute part maintains the same surface mount package and exposed pad configuration, enabling direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the AOZ1284PI directly replace the SC4518ISTRT in existing designs?

A: Yes. Both parts share identical package form factor (8-SOIC with exposed pad), matching topology (buck regulator), identical output configuration (positive adjustable), and the same operating temperature range (-40°C ~ 85°C). The AOZ1284PI provides enhanced electrical specifications that support applications designed for the SC4518ISTRT.

Q: What are the key differences between these parts?

A: The AOZ1284PI provides higher input voltage tolerance (36V maximum vs. 16V), lower minimum output voltage (0.8V vs. 1.2V), higher maximum output voltage (30.6V vs. 13.6V), and greater output current capacity (4A vs. 2A). The AOZ1284PI is in active production while the SC4518ISTRT is obsolete.

Q: Are there any PCB layout considerations when substituting the AOZ1284PI for the SC4518ISTRT?

A: No layout changes are required. Both parts use the identical 8-SOIC (0.154", 3.90mm Width) Exposed Pad package, enabling direct pin-for-pin substitution without PCB redesign.

Q: What is the switching frequency difference, and does it affect circuit design?

A: The SC4518ISTRT operates at a fixed 600kHz switching frequency. The AOZ1284PI operates across a 200kHz to 1MHz range, which encompasses the original frequency. Circuit design parameters dependent on switching frequency should be evaluated for the specific operating point of the AOZ1284PI in the application.

Q: Does the AOZ1284PI meet current regulatory compliance standards?

A: Yes. The AOZ1284PI is ROHS3 compliant and carries REACH Unaffected status, meeting current environmental and regulatory requirements for electronic components.

Q: What is the moisture sensitivity difference between these parts?

A: The SC4518ISTRT has MSL 1 (Unlimited), while the AOZ1284PI has MSL 2 (1 Year). Standard handling and storage procedures for MSL 2 components apply to the substitute part.