MIC5209-2.5BS TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC5209-2.5BS TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 2.5V output applications with 500mA current capacity in SOT-223-3 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The device provides regulated 2.5V output with integrated protection features including over-current, over-temperature, and reverse polarity protection, suitable for low-power supply applications requiring stable voltage regulation.

Key Parameters

Parameter	Value
Manufacturer Part Number	MIC5209-2.5BS TR
Manufacturer	Microchip Technology
Output Voltage (Fixed)	2.5V
Output Current	500mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.6V @ 500mA
Package Type	SOT-223-3
Operating Temperature Range	-40°C ~ 125°C
Product Status	Obsolete
Protection Features	Over Current, Over Temperature, Reverse Polarity

Substitute Part Grouping Explanation

Substitution for the MIC5209-2.5BS TR is determined by the following critical parameters:

Output voltage fixed at 2.5V
Output current capability of 500mA or greater
Maximum input voltage of 16V or greater
SOT-223-3 or compatible SOT-223 package
Operating temperature range of -40°C to 125°C or compatible range
Surface mount technology
Protection features including over-current and over-temperature protection

Substitute parts are grouped into two categories: direct parametric equivalents from Microchip Technology and manufacturer-recommended alternatives from Texas Instruments, Analog Devices Inc., and MaxLinear, Inc. All substitute parts meet or exceed the electrical specifications of the original part while maintaining package compatibility.

Parameter Comparison

Parameter	MIC5209-2.5BS TR	MIC5209-2.5YS-TR	LM2937IMP-2.5/NOPB	LM2937IMPX-2.5/NOPB	LT1963AEST-2.5#PBF	LT1963AEST-2.5#TRPBF	SPX3940M3-L-2-5/TR
Manufacturer	Microchip	Microchip	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	MaxLinear
Output Voltage	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Output Current	500mA	500mA	500mA	500mA	1.5A	1.5A	1A
Input Voltage (Max)	16V	16V	26V	26V	20V	20V	16V
Voltage Dropout (Max)	0.6V @ 500mA	0.6V @ 500mA	1V @ 500mA	1V @ 500mA	0.55V @ 1.5A	0.55V @ 1.5A	0.55V @ 1A
Package	SOT-223-3	SOT-223-3	SOT-223-4	SOT-223-4	SOT-223-3	SOT-223-3	SOT-223-3
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Parametric Equivalent: MIC5209-2.5YS-TR from Microchip Technology is the direct parametric equivalent with identical electrical specifications and SOT-223-3 packaging. This part is active and ROHS3 compliant, making it the preferred choice for direct replacement in new designs and production continuity.

Higher Current Capacity Alternatives: LT1963AEST-2.5#TRPBF and LT1963AEST-2.5#PBF from Analog Devices Inc. provide 1.5A output current with lower dropout voltage (0.55V @ 1.5A) and superior PSRR performance (63dB @ 120Hz). These parts maintain SOT-223-3 packaging and -40°C to 125°C operating temperature range. The tape and reel variant (LT1963AEST-2.5#TRPBF) offers higher inventory availability.

Texas Instruments Alternatives: LM2937IMP-2.5/NOPB and LM2937IMPX-2.5/NOPB provide 500mA output current with extended input voltage rating (26V maximum) and enhanced protection features including mirror-image insertion protection. These parts use SOT-223-4 packaging with one additional pin. Operating temperature range is -40°C to 85°C, which is narrower than the original part.

MaxLinear Alternative: SPX3940M3-L-2-5/TR provides 1A output current with 0.55V dropout voltage at 1A and comprehensive protection features. This part maintains SOT-223-3 packaging and -40°C to 125°C operating temperature range with RoHS compliance and unlimited moisture sensitivity level.

All substitute parts are active products with current manufacturing status and RoHS compliance, ensuring long-term availability and regulatory compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can MIC5209-2.5YS-TR be used as a direct replacement for MIC5209-2.5BS TR? A: Yes. MIC5209-2.5YS-TR is a direct parametric equivalent with identical output voltage (2.5V), output current (500mA), input voltage rating (16V maximum), dropout voltage (0.6V @ 500mA), and SOT-223-3 packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What are the package differences between SOT-223-3 and SOT-223-4? A: SOT-223-3 has three pins (input, output, ground), while SOT-223-4 has four pins with an additional pin for enhanced functionality. Texas Instruments LM2937 variants use SOT-223-4 packaging. PCB layout modifications are required for SOT-223-4 substitution.

Q: Can higher current capacity parts like LT1963AEST-2.5#TRPBF be used in place of the MIC5209-2.5BS TR? A: Yes. Higher current capacity parts are backward compatible when the application requires only 500mA or less. The LT1963AEST-2.5#TRPBF provides 1.5A capability, lower dropout voltage, and superior performance characteristics while maintaining the same 2.5V output voltage and SOT-223-3 package.

Q: What is the impact of operating temperature range differences? A: The original MIC5209-2.5BS TR and recommended Microchip, Analog Devices, and MaxLinear alternatives support -40°C to 125°C operation. Texas Instruments LM2937 variants support -40°C to 85°C. For applications requiring operation above 85°C, use alternatives with extended temperature range.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed are RoHS compliant (ROHS3 or RoHS Compliant status). The original MIC5209-2.5BS TR is RoHS non-compliant. For applications requiring RoHS compliance, use any of the listed active substitute parts.

Q: What is the significance of moisture sensitivity level differences? A: The original part has MSL 3 (168 hours), requiring controlled storage conditions. All substitute parts have MSL 1 (unlimited), eliminating moisture sensitivity concerns and simplifying inventory management and handling procedures.

Q: Which substitute part offers the best performance improvement? A: LT1963AEST-2.5#TRPBF provides the most significant performance improvements: 1.5A output current (3x the original), 0.55V dropout voltage (lower than original 0.6V), 63dB PSRR performance, and enable control feature. It maintains full temperature range compatibility and SOT-223-3 packaging.

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