MIC37100-1.5BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC37100-1.5BS TR is a linear voltage regulator IC from Microchip Technology, rated for 1.5V fixed output at 1A maximum current in SOT-223-3 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides positive fixed output regulation with integrated over-current and over-temperature protection across an operating temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Output Voltage (Fixed)	1.5V
Output Current	1A
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.5V @ 1A
Package Type	SOT-223-3
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MIC37100-1.5BS TR is determined by the following critical parameters:

Fixed output voltage of 1.5V
Output current capability of 1A or greater
Maximum input voltage of 6V or greater
SOT-223-3 or compatible package footprint (TO-261-4, TO-261AA)
Surface mount technology
Operating temperature range covering -40°C to 125°C
Over-current and over-temperature protection

Substitute parts are grouped into two categories: parametric equivalents from the same manufacturer (Microchip Technology) and manufacturer-recommended alternatives from other suppliers (Diodes Incorporated, Analog Devices Inc., Texas Instruments). All listed substitutes meet or exceed the electrical and mechanical requirements of the original part.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Status	RoHS Compliance
MIC37100-1.5BS TR	Microchip Technology	1.5V	1A	6V	0.5V @ 1A	SOT-223-3	Obsolete	Non-compliant
MIC37100-1.5WS-TR	Microchip Technology	1.5V	1A	6V	0.5V @ 1A	SOT-223-3	Active	ROHS3 Compliant
AP7361-15E-13	Diodes Incorporated	1.5V	1A	6V	0.7V @ 1A	SOT-223-3	Active	ROHS3 Compliant
AP7361-15ER-13	Diodes Incorporated	1.5V	1A	6V	0.7V @ 1A	SOT-223R	Active	ROHS3 Compliant
LT1963AEST-1.5#PBF	Analog Devices Inc.	1.5V	1.5A	20V	0.55V @ 1.5A	SOT-223-3	Active	ROHS3 Compliant
LT1963AEST-1.5#TRPBF	Analog Devices Inc.	1.5V	1.5A	20V	0.55V @ 1.5A	SOT-223-3	Active	ROHS3 Compliant
TLV1117LV15DCYR	Texas Instruments	1.5V	1A	5.5V	1.3V @ 800mA	SOT-223-4	Last Time Buy	ROHS3 Compliant
TLV1117LV15DCYT	Texas Instruments	1.5V	1A	5.5V	1.3V @ 800mA	SOT-223-4	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MIC37100-1.5WS-TR

The MIC37100-1.5WS-TR is the direct parametric equivalent from Microchip Technology. It maintains identical electrical specifications (1.5V output, 1A current, 0.5V dropout at 1A, 6V maximum input) and package configuration (SOT-223-3). This part is in active production status and is ROHS3 compliant, addressing the RoHS non-compliance of the obsolete original part. This is the preferred choice for direct replacement in existing designs.

Secondary Recommendation: AP7361-15ER-13

The AP7361-15ER-13 from Diodes Incorporated offers the highest inventory availability (82,700 pcs) and meets all core electrical requirements. It features identical output voltage and current ratings with a slightly higher dropout voltage (0.7V vs. 0.5V at 1A). The part is active, ROHS3 compliant, and available in SOT-223R packaging. This option is suitable when inventory priority or extended lead time mitigation is required.

Alternative for Higher Current Applications: LT1963AEST-1.5#TRPBF

The LT1963AEST-1.5#TRPBF from Analog Devices Inc. provides enhanced specifications with 1.5A output current capability (versus 1A) and higher maximum input voltage (20V versus 6V). It includes additional protection features (reverse polarity protection) and an enable control function. This part is active and ROHS3 compliant. Selection of this part is appropriate when designs require higher current headroom or extended input voltage range.

Not Recommended: TLV1117LV15DCYR and TLV1117LV15DCYT

Both Texas Instruments parts are classified as Last Time Buy status, indicating end-of-life trajectory. While electrically compatible, the higher dropout voltage (1.3V @ 800mA versus 0.5V @ 1A) and lower maximum input voltage (5.5V versus 6V) make these less suitable for new designs. These parts should be avoided for new production.

Frequently Asked Questions (FAQ)

Q: Can MIC37100-1.5WS-TR be used as a direct drop-in replacement for MIC37100-1.5BS TR?

A: Yes. The MIC37100-1.5WS-TR is electrically and mechanically identical to the original part, with identical SOT-223-3 packaging, output voltage, current rating, and dropout specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What is the difference between AP7361-15E-13 and AP7361-15ER-13?

A: Both parts are from Diodes Incorporated with identical electrical specifications. The primary difference is packaging designation: AP7361-15E-13 uses standard SOT-223-3 packaging, while AP7361-15ER-13 uses SOT-223R packaging. The SOT-223R variant has higher inventory availability (82,700 pcs versus 2,700 pcs). Verify PCB footprint compatibility before selection.

Q: Why does LT1963AEST-1.5#TRPBF have different electrical specifications?

A: The LT1963AEST-1.5#TRPBF is a higher-performance device with enhanced specifications. It provides 1.5A output current (versus 1A), accepts up to 20V input (versus 6V), and includes additional protection features and control functions. These enhancements make it suitable for applications requiring higher current capacity or wider input voltage range, though it is not required for direct replacement of the original part.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except the original MIC37100-1.5BS TR, which is RoHS non-compliant. This compliance improvement is a key advantage of migration to any of the listed substitutes.

Q: What is the significance of packaging variants (SOT-223-3 versus SOT-223-4 versus SOT-223R)?

A: SOT-223-3, SOT-223-4, and SOT-223R are related but distinct package footprints. SOT-223-3 and SOT-223-4 differ in pin count and internal configuration. SOT-223R is a variant of SOT-223-3 with modified lead geometry. PCB footprint compatibility must be verified before substitution. Most designs using SOT-223-3 can accommodate SOT-223R with minor layout adjustment, but SOT-223-4 requires different PCB routing.

Q: Which substitute part offers the best balance of availability and compatibility?

A: The AP7361-15ER-13 offers the highest inventory availability (82,700 pcs) with full electrical compatibility and active production status. The MIC37100-1.5WS-TR provides the most direct replacement with identical specifications and is the preferred choice when inventory is available.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message