SC1566IT-1.8T Equivalent & Substitute Parts

Part Overview

The SC1566IT-1.8T is a linear voltage regulator IC manufactured by Semtech Corporation, designed to deliver a fixed 1.8V output at 3A in a TO-220-3 package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides positive fixed output configuration with integrated over-current and over-temperature protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	3A
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.6V @ 3A
Package Type	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 150°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SC1566IT-1.8T is determined by the following critical parameters:

Fixed output voltage of 1.8V
Output current capability of 3A minimum
TO-220-3 package configuration for mechanical and thermal compatibility
Through-hole mounting type
Over-current and over-temperature protection features
Input voltage rating sufficient for the application circuit

The MIC39300-1.8WT meets all substitution criteria as an active, currently manufactured alternative with identical output specifications and package form factor.

Parameter Comparison

Parameter	SC1566IT-1.8T	MIC39300-1.8WT
Manufacturer	Semtech Corporation	Microchip Technology
Output Voltage (Fixed)	1.8V	1.8V
Output Current	3A	3A
Input Voltage (Max)	5.5V	16V
Voltage Dropout (Max)	0.6V @ 3A	0.55V @ 3A
Package / Case	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole
Operating Temperature Range	-40°C ~ 150°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity
Product Status	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

The MIC39300-1.8WT is the direct substitute for the SC1566IT-1.8T. Selection is based on:

Identical fixed output voltage and current rating
Identical TO-220-3 package and through-hole mounting compatibility
Active product status with current manufacturing availability
ROHS3 compliance and REACH unaffected status for regulatory requirements
Superior input voltage rating (16V vs 5.5V) provides broader application flexibility
Improved dropout voltage (0.55V vs 0.6V) offers marginal efficiency advantage
Additional reverse polarity protection feature

Applications requiring the SC1566IT-1.8T operating temperature range above 125°C must evaluate thermal management and application-specific constraints.

Frequently Asked Questions (FAQ)

Q: Can the MIC39300-1.8WT directly replace the SC1566IT-1.8T in existing designs?

A: Yes. Both devices share identical output voltage (1.8V), output current (3A), and TO-220-3 package configuration. Pin-to-pin compatibility and mechanical fit are equivalent. No PCB modifications are required.

Q: What is the difference in input voltage ratings between these parts?

A: The SC1566IT-1.8T accepts maximum 5.5V input, while the MIC39300-1.8WT accepts up to 16V. The MIC39300-1.8WT provides greater flexibility for applications with higher input voltage sources.

Q: Are there temperature range considerations for substitution?

A: The SC1566IT-1.8T operates to 150°C maximum, while the MIC39300-1.8WT operates to 125°C maximum. Applications requiring operation above 125°C must confirm thermal performance under specific load conditions.

Q: Does the MIC39300-1.8WT offer additional protection features?

A: Yes. The MIC39300-1.8WT includes reverse polarity protection in addition to over-current and over-temperature protection present in both devices.

Q: What is the regulatory compliance status of the substitute part?

A: The MIC39300-1.8WT is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for component procurement.

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