MIC37100-1.8WS-TR Equivalent & Substitute Parts

Part Overview

The MIC37100-1.8WS-TR is a linear voltage regulator IC from Microchip Technology, classified as a Power Management (PMIC) component. It delivers a fixed 1.8V output at 1A maximum current in a surface-mount SOT-223-3 package. The device is actively produced and RoHS3 compliant, making it suitable for applications requiring stable low-voltage power delivery with integrated over-current and over-temperature protection.

Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific application parameters that fall within the allowable electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC37100-1.8WS-TR
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	1A
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.5V @ 1A
Package / Case	SOT-223-3
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the MIC37100-1.8WS-TR are classified based on strict adherence to the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current capability of 1A or greater
Maximum input voltage of 5.5V or higher
SOT-223 package family (SOT-223-3 or SOT-223-4)
Surface-mount technology
Over-current and over-temperature protection
Active product status
RoHS3 compliance

Substitution Categories:

MFR Recommended Substitutes meet all primary criteria with direct functional equivalence and are recommended by manufacturers as primary alternatives.

Parametric Equivalents satisfy all critical electrical and mechanical parameters but may exhibit minor variations in secondary specifications such as quiescent current, PSRR, or maximum input voltage that do not affect core functionality in standard applications.

Parameter Comparison

Parameter	MIC37100-1.8WS-TR	AP2114HA-1.8TRG1	LT1963AEST-1.8#PBF	TLV1117LV18DCYR	TLV1117LV18DCYT
Manufacturer	Microchip Technology	Diodes Incorporated	Analog Devices Inc.	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	1.8V	1.8V	1.8V	1.8V	1.8V
Output Current	1A	1A	1.5A	1A	1A
Input Voltage (Max)	6V	6V	20V	5.5V	5.5V
Voltage Dropout (Max)	0.5V @ 1A	0.7V @ 1A	0.55V @ 1.5A	1.3V @ 800mA	1.3V @ 800mA
Package / Case	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-4	SOT-223-4
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

AP2114HA-1.8TRG1 (Diodes Incorporated) is classified as an MFR Recommended substitute. It maintains electrical equivalence with 1A output current and 1.8V fixed output. The device operates within the -40°C to 85°C temperature range, which is narrower than the main part. This substitute is suitable for applications where the upper operating temperature does not exceed 85°C. All regulatory compliance requirements (RoHS3, REACH Unaffected, EAR99) are met.

LT1963AEST-1.8#PBF (Analog Devices Inc.) is classified as an MFR Recommended substitute. This device provides enhanced output current capability at 1.5A and operates across the full -40°C to 125°C temperature range, matching the main part. The maximum input voltage specification of 20V exceeds the main part requirement, providing additional design margin. Reverse polarity protection is included as an additional safety feature. All regulatory compliance requirements are met.

TLV1117LV18DCYR and TLV1117LV18DCYT (Texas Instruments) are classified as Parametric Equivalents. Both devices deliver 1A output current at 1.8V fixed output and operate across -40°C to 125°C. The maximum input voltage is specified at 5.5V, which is lower than the main part's 6V specification. The voltage dropout specification of 1.3V @ 800mA is higher than the main part's 0.5V @ 1A. These devices are suitable for applications where input voltage does not exceed 5.5V and where the higher dropout voltage is acceptable. Both variants are identical in electrical specifications; the difference is in packaging designation (DCYR vs. DCYT). All regulatory compliance requirements are met.

Frequently Asked Questions (FAQ)

Q: Can AP2114HA-1.8TRG1 be used in applications requiring operation above 85°C?

A: No. The AP2114HA-1.8TRG1 is specified for operation only to 85°C maximum. Applications requiring the full -40°C to 125°C range must use MIC37100-1.8WS-TR, LT1963AEST-1.8#PBF, or the Texas Instruments TLV1117 variants.

Q: What is the difference between TLV1117LV18DCYR and TLV1117LV18DCYT?

A: Both parts are electrically identical with the same specifications. The designations DCYR and DCYT refer to different packaging formats (Cut Tape & Digi-Reel variants). Selection between them depends on procurement and assembly requirements.

Q: Is the LT1963AEST-1.8#PBF a direct replacement for MIC37100-1.8WS-TR?

A: The LT1963AEST-1.8#PBF meets all critical electrical parameters and operates across the same temperature range. However, it is supplied in Tube packaging rather than Tape & Reel, and the output current capability is 1.5A versus 1A. These differences do not affect functional compatibility in standard applications.

Q: Why do the Texas Instruments TLV1117 variants have a higher dropout voltage?

A: The TLV1117LV18DCYR and TLV1117LV18DCYT are specified with 1.3V dropout at 800mA, compared to 0.5V @ 1A for the main part. This is a characteristic difference between device architectures. Applications with tight input voltage margins or requiring maximum efficiency should account for this specification difference.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH Unaffected, matching the regulatory status of the MIC37100-1.8WS-TR.

Q: Can I use LT1963AEST-1.8#PBF in a design that requires SOT-223-3 package?

A: Yes. The LT1963AEST-1.8#PBF is supplied in SOT-223-3 package, identical to the main part. The package footprint and pin configuration are compatible.

Q: What is the key difference between MFR Recommended and Parametric Equivalent classifications?

A: MFR Recommended substitutes are explicitly endorsed by manufacturers as primary alternatives and meet all specifications with direct functional equivalence. Parametric Equivalents satisfy all critical electrical and mechanical parameters but may have minor variations in secondary specifications that do not affect core functionality.

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