MIC37100-2.5BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC37100-2.5BS TR is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 2.5V output at 1A in a SOT-223-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The regulator provides over-current and over-temperature protection across an operating 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)	2.5V
Output Current	1A
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.5V @ 1A
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-3
Protection Features	Over Current, Over Temperature
Output Configuration	Positive Fixed

Substitute Part Grouping Explanation

Substitute parts for the MIC37100-2.5BS TR are grouped based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Fixed output voltage of 2.5V
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 mounting type
Over-current and over-temperature protection

Grouping Logic:

Parametric Equivalents – Parts with identical or superior electrical specifications and active product status
Manufacturer Recommended Alternatives – Parts explicitly recommended by manufacturers with enhanced features or higher current ratings

Parameter Comparison

Manufacturer Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Product Status	RoHS Status
MIC37100-2.5BS TR	Microchip Technology	2.5V	1A	6V	0.5V @ 1A	SOT-223-3	Obsolete	Non-compliant
MIC37100-2.5WS-TR	Microchip Technology	2.5V	1A	6V	0.5V @ 1A	SOT-223-3	Active	ROHS3 Compliant
AP2114HA-2.5TRG1	Diodes Incorporated	2.5V	1A	6V	0.75V @ 1A	SOT-223-3	Active	ROHS3 Compliant
LT1963AEST-2.5#PBF	Analog Devices Inc.	2.5V	1.5A	20V	0.55V @ 1.5A	SOT-223-3	Active	ROHS3 Compliant
LT1963AEST-2.5#TRPBF	Analog Devices Inc.	2.5V	1.5A	20V	0.55V @ 1.5A	SOT-223-3	Active	ROHS3 Compliant
TLV1117LV25DCYR	Texas Instruments	2.5V	1A	5.5V	1.3V @ 800mA	SOT-223-4	Active	ROHS3 Compliant
TLV1117LV25DCYT	Texas Instruments	2.5V	1A	5.5V	1.3V @ 800mA	SOT-223-4	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): MIC37100-2.5WS-TR from Microchip Technology is the direct parametric equivalent with identical electrical specifications. This part maintains the same 0.5V dropout voltage and 1A output current while offering active product status and ROHS3 compliance, eliminating the obsolescence issue of the original MIC37100-2.5BS TR.

Enhanced Current Capability: LT1963AEST-2.5#TRPBF and LT1963AEST-2.5#PBF from Analog Devices Inc. provide 1.5A output current with superior input voltage tolerance (20V maximum). These parts are recommended for applications requiring higher current headroom or wider input voltage ranges. The tape & reel packaging (LT1963AEST-2.5#TRPBF) is preferred for production volumes.

Alternative Sourcing: AP2114HA-2.5TRG1 from Diodes Incorporated and TLV1117LV25DCYR/TLV1117LV25DCYT from Texas Instruments provide active alternatives with ROHS3 compliance. The Texas Instruments variants use SOT-223-4 packaging (4-pin configuration) versus the original SOT-223-3 (3-pin), requiring PCB layout verification before implementation.

Compliance Consideration: All recommended substitutes are ROHS3 compliant and REACH unaffected, addressing regulatory requirements absent in the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can MIC37100-2.5WS-TR directly replace MIC37100-2.5BS TR without PCB modifications? A: Yes. MIC37100-2.5WS-TR is electrically and mechanically identical, using the same SOT-223-3 package and pinout. Only the packaging format differs (cut tape versus tape & reel), which does not affect circuit operation.

Q: What is the difference between SOT-223-3 and SOT-223-4 packages? A: SOT-223-3 has three pins (input, output, ground), while SOT-223-4 adds a fourth pin for enhanced thermal performance. Parts using SOT-223-4 (TLV1117LV25DCYR, TLV1117LV25DCYT) require different PCB footprints and cannot be used as direct pin-for-pin replacements without layout redesign.

Q: Why do some substitutes have higher dropout voltages? A: Dropout voltage varies by design. AP2114HA-2.5TRG1 specifies 0.75V @ 1A versus the original 0.5V @ 1A. This affects minimum input voltage requirements; verify that your input voltage remains sufficient for proper regulation in your application.

Q: Are the Analog Devices LT1963 variants suitable for 1A applications? A: Yes. LT1963AEST-2.5#PBF and LT1963AEST-2.5#TRPBF are rated for 1.5A output current, providing 50% additional headroom above the 1A requirement. They are fully compatible with 1A load applications.

Q: What is the significance of ROHS3 compliance? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. This is mandatory for many markets and applications. The original MIC37100-2.5BS TR is non-compliant, making compliant substitutes necessary for new designs.

Q: Which substitute offers the best input voltage tolerance? A: LT1963AEST-2.5#TRPBF and LT1963AEST-2.5#PBF support maximum input voltage of 20V, compared to 6V for the original and most alternatives. This provides significant design flexibility for applications with variable input sources.

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