SC4519STRT Equivalent & Substitute Parts

Part Overview

The SC4519STRT is a buck switching regulator IC manufactured by Semtech Corporation, designed for positive adjustable step-down voltage regulation with a 3A output capacity. This device operates across an input voltage range of 3V to 16V and provides adjustable output voltage from 1.2V to 13.6V in an 8-SOIC surface mount package with exposed pad.

The SC4519STRT is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	SC4519STRT
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	3V
Voltage - Input (Max)	16V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	13.6V
Current - Output	3A
Frequency - Switching	600kHz
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Operating Temperature	-40°C ~ 85°C (TA)

Substitute Part Grouping Explanation

Substitute parts for the SC4519STRT are identified based on strict alignment with the following critical parameters:

Topology & Function: Buck (step-down) switching regulator with positive adjustable output
Output Capacity: 3A continuous output current
Package Compatibility: 8-SOIC (0.154", 3.90mm Width) Exposed Pad surface mount package
Operating Temperature Range: -40°C to 85°C (TA)
Input Voltage Compatibility: Minimum 3V input support
Output Voltage Adjustability: Adjustable output voltage capability

The RT8299AZSP meets these core substitution criteria. Both devices share identical package geometry, surface mount configuration, and core functional specifications. Substitution is valid where the application requirements fall within the overlapping electrical specifications of both components.

Parameter Comparison

Parameter	SC4519STRT	RT8299AZSP
Manufacturer	Semtech Corporation	Richtek USA Inc.
Product Status	Obsolete	Active
Function	Step-Down (Buck)	Step-Down (Buck)
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Number of Outputs	1	1
Voltage - Input (Min)	3V	3V
Voltage - Input (Max)	16V	24V
Voltage - Output (Min/Fixed)	1.2V	0.8V
Voltage - Output (Max)	13.6V	15V
Current - Output	3A	3A
Frequency - Switching	600kHz	500kHz
Synchronous Rectifier	No	Yes
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	Not specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The RT8299AZSP is the manufacturer-recommended substitute for the SC4519STRT. Both devices share identical package geometry and core functional specifications, enabling direct substitution in applications where electrical parameters overlap.

The RT8299AZSP offers extended input voltage capability (24V maximum versus 16V) and lower minimum output voltage (0.8V versus 1.2V), providing greater design flexibility. The RT8299AZSP includes an integrated synchronous rectifier, improving efficiency compared to the non-synchronous SC4519STRT.

The RT8299AZSP maintains active product status with ROHS3 compliance and REACH unaffected certification, supporting long-term supply chain continuity. The higher moisture sensitivity level (MSL 3 versus MSL 1) requires adherence to specified storage and handling protocols during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the RT8299AZSP directly replace the SC4519STRT in existing designs?

A: Direct substitution is valid for applications where output voltage requirements fall within the overlapping range (1.2V to 13.6V) and input voltage does not exceed 16V. The identical 8-SOIC package and pinout enable direct PCB compatibility. Functional verification is required to confirm performance in the specific application circuit.

Q: What are the key electrical differences between these devices?

A: The RT8299AZSP supports higher maximum input voltage (24V versus 16V), lower minimum output voltage (0.8V versus 1.2V), and includes an integrated synchronous rectifier for improved efficiency. Switching frequency differs slightly (500kHz versus 600kHz). These differences do not prevent substitution in applications designed for the SC4519STRT's specifications.

Q: Are there packaging or handling differences?

A: Both devices use identical 8-SOIC (0.154", 3.90mm Width) Exposed Pad packages. The RT8299AZSP has higher moisture sensitivity (MSL 3, 168 hours) compared to the SC4519STRT (MSL 1, unlimited). Storage and handling must comply with MSL 3 requirements for the RT8299AZSP.

Q: Why is the SC4519STRT obsolete?

A: The SC4519STRT is classified as obsolete by the manufacturer. The RT8299AZSP is the active equivalent, ensuring continued availability and supply chain support for new and ongoing production requirements.

Q: Are there compliance or certification considerations?

A: The RT8299AZSP is ROHS3 compliant and REACH unaffected. Verify compliance requirements for your specific application and region before implementation.

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