MIC37100-1.8BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC37100-1.8BS TR is a linear voltage regulator IC manufactured by Microchip Technology, designed to deliver a fixed 1.8V output at 1A in a SOT-223-3 surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The regulator provides over-current and over-temperature protection across an operating temperature range of -40°C to 125°C, with a maximum input voltage of 6V and dropout voltage of 0.5V at 1A.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	1A
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.5V @ 1A
Package Type	SOT-223-3
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MIC37100-1.8BS TR is determined by the following critical parameters:

Fixed output voltage of 1.8V
Output current capability of 1A minimum
Maximum input voltage of 6V or greater
Surface mount SOT-223 package compatibility
Operating temperature range of -40°C to 125°C minimum
Over-current and over-temperature protection

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications and package) and manufacturer-recommended alternatives (functionally compatible with minor specification variations). All listed substitutes maintain the core electrical characteristics required for direct replacement in applications designed for the MIC37100-1.8BS TR.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Operating Temp Range	Product Status	RoHS Compliance
MIC37100-1.8BS TR	Microchip Technology	1.8V	1A	6V	0.5V @ 1A	SOT-223-3	-40°C to 125°C	Obsolete	Non-compliant
MIC37100-1.8WS-TR	Microchip Technology	1.8V	1A	6V	0.5V @ 1A	SOT-223-3	-40°C to 125°C	Active	ROHS3 Compliant
AP2114HA-1.8TRG1	Diodes Incorporated	1.8V	1A	6V	0.7V @ 1A	SOT-223-3	-40°C to 85°C	Active	ROHS3 Compliant
AP7361-18E-13	Diodes Incorporated	1.8V	1A	6V	0.7V @ 1A	SOT-223-3	-40°C to 85°C	Active	ROHS3 Compliant
AP7361-18ER-13	Diodes Incorporated	1.8V	1A	6V	0.7V @ 1A	SOT-223R	-40°C to 85°C	Active	ROHS3 Compliant
LT1963AEST-1.8#TRPBF	Analog Devices Inc.	1.8V	1.5A	20V	0.55V @ 1.5A	SOT-223-3	-40°C to 125°C	Active	ROHS3 Compliant
TLV1117LV18DCYR	Texas Instruments	1.8V	1A	5.5V	1.3V @ 800mA	SOT-223-4	-40°C to 125°C	Active	ROHS3 Compliant
TLV1117LV18DCYT	Texas Instruments	1.8V	1A	5.5V	1.3V @ 800mA	SOT-223-4	-40°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MIC37100-1.8WS-TR

The MIC37100-1.8WS-TR is the direct parametric equivalent to the obsolete MIC37100-1.8BS TR. It maintains identical electrical specifications, package configuration, and operating temperature range while offering active product status and ROHS3 compliance. This part is the preferred choice for direct replacement in existing designs.

Alternative Recommendations:

AP7361-18E-13 or AP7361-18ER-13 (Diodes Incorporated) provide active alternatives with equivalent 1.8V output and 1A current capability. These parts feature improved protection characteristics including short-circuit protection and lower moisture sensitivity (MSL 1). The AP7361-18ER-13 variant uses SOT-223R packaging. Operating temperature range is reduced to -40°C to 85°C, which is acceptable for most commercial and industrial applications.

LT1963AEST-1.8#TRPBF (Analog Devices Inc.) offers enhanced specifications with 1.5A output current capability and 20V maximum input voltage, providing design margin for applications requiring higher current or input voltage tolerance. This part maintains the full -40°C to 125°C operating range and includes an enable control feature. Higher quiescent current (1.5 mA) should be evaluated for battery-powered applications.

TLV1117LV18DCYR or TLV1117LV18DCYT (Texas Instruments) are parametric equivalents with 1A output current and full temperature range support. These parts use SOT-223-4 packaging (four pins versus three) and feature higher dropout voltage (1.3V @ 800mA), which may impact applications with tight input voltage margins below 3.1V.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can MIC37100-1.8WS-TR be used as a direct drop-in replacement for MIC37100-1.8BS TR?

A: Yes. The MIC37100-1.8WS-TR is a parametric equivalent with identical output voltage, current rating, package type (SOT-223-3), and operating temperature range. No circuit modifications are required.

Q: What is the difference between AP7361-18E-13 and AP7361-18ER-13?

A: Both parts are electrically identical with 1.8V output and 1A current capability. The primary difference is packaging: AP7361-18E-13 uses standard SOT-223-3, while AP7361-18ER-13 uses SOT-223R variant. Verify PCB footprint compatibility before selection.

Q: Why does TLV1117LV18DCYR have higher dropout voltage than the original part?

A: The TLV1117LV18DCYR is specified at 1.3V dropout @ 800mA, compared to 0.5V @ 1A for the MIC37100-1.8BS TR. This characteristic is inherent to the TLV1117 architecture. Applications requiring low dropout performance should prioritize MIC37100-1.8WS-TR or AP7361 series alternatives.

Q: Is the LT1963AEST-1.8#TRPBF compatible with designs requiring exactly 1A output?

A: Yes. The LT1963AEST-1.8#TRPBF is rated for 1.5A output current, which exceeds the 1A requirement. It can be used in any application designed for 1A or less. The higher current rating provides design margin without affecting circuit operation at lower current levels.

Q: What packaging consideration applies to TLV1117LV18DCYR?

A: The TLV1117LV18DCYR uses SOT-223-4 packaging (four pins) versus SOT-223-3 (three pins) for the original part. PCB footprints are not interchangeable. Verify that your PCB layout accommodates the four-pin configuration before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification. The original MIC37100-1.8BS TR is marked as non-compliant due to its obsolete status.

Q: Which substitute offers the widest input voltage range?

A: The LT1963AEST-1.8#TRPBF supports maximum input voltage of 20V, compared to 6V for most other alternatives. This part is suitable for applications with higher input voltage sources or greater voltage tolerance requirements.

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