MIC29503BT Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The MIC29503BT is a linear voltage regulator IC from Microchip Technology designed for positive adjustable output applications. This device delivers 5A output current in a TO-220-5 package and supports input voltages up to 26V with adjustable output ranging from 1.25V to 25V. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	25V
Voltage Dropout (Max)	0.6V @ 5A
Current - Output	5A
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-220-5
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage

Substitute Part Grouping Explanation

Substitute parts for the MIC29503BT are qualified based on matching the following critical electrical and mechanical parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage specifications (Input Max: 26V, Output Min: 1.25V, Output Max: 25V)
Current rating (5A)
Voltage dropout (0.6V @ 5A)
Operating temperature range (-40°C ~ 125°C)
Package type (TO-220-5)
Protection features (Over Current, Over Temperature, Reverse Polarity, Transient Voltage)

All substitute parts listed maintain identical electrical performance and mechanical compatibility with the original MIC29503BT specification.

Parameter Comparison

Parameter	MIC29503BT (Main)	MIC29503WT	MIC29503BT L2	MIC29503BT L3
Manufacturer	Microchip Technology	Microchip Technology	Micrel Inc.	Micrel Inc.
Product Status	Obsolete	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	26V	26V	26V	26V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V
Voltage - Output (Max)	25V	25V	25V	25V
Voltage Dropout (Max)	0.6V @ 5A	0.6V @ 5A	0.6V @ 5A	0.6V @ 5A
Current - Output	5A	5A	5A	5A
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-220-5	TO-220-5	TO-220-5	TO-220-5
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Over Current, Over Temperature, Reverse Polarity, Transient Voltage
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not applicable	Not applicable
Packaging	Bulk	Tube	Bulk	Bulk
Inventory Status	3838 Pcs	7301 Pcs	5265 Pcs	1199 Pcs

Engineering Selection Recommendations

MIC29503WT is the primary substitute for the obsolete MIC29503BT. Both parts are manufactured by Microchip Technology and share identical electrical specifications. The MIC29503WT carries Active product status and ROHS3 compliance, making it suitable for new designs and applications requiring RoHS certification. Packaging differs (Tube vs. Bulk), which may affect procurement and handling procedures.

MIC29503BT L2 and MIC29503BT L3 are parametric equivalents manufactured by Micrel Inc. These parts maintain all critical electrical and mechanical parameters identical to the main part. Both carry Active product status. RoHS status is listed as Not applicable, and REACH status is Vendor Undefined. These options provide alternative sourcing channels with adequate inventory availability.

Selection between substitute parts should be based on procurement requirements, compliance certifications needed for the application, and packaging preferences. All listed substitutes are electrically and mechanically interchangeable with the MIC29503BT.

Frequently Asked Questions (FAQ)

Q: Can MIC29503WT directly replace MIC29503BT in existing designs?

A: Yes. The MIC29503WT is a direct substitute with identical electrical specifications, output configuration, current rating, voltage parameters, and protection features. The primary difference is product status (Active vs. Obsolete) and RoHS compliance level. Physical package and pinout are identical (TO-220-5).

Q: What is the difference between MIC29503WT and MIC29503BT L2/L3?

A: MIC29503WT is manufactured by Microchip Technology (original manufacturer) and carries ROHS3 compliance. MIC29503BT L2 and L3 are manufactured by Micrel Inc. and are parametric equivalents with identical electrical performance. All three parts meet the same functional requirements and are mechanically compatible.

Q: Are there packaging differences between the substitute parts?

A: Yes. MIC29503WT is supplied in Tube packaging, while MIC29503BT L2 and L3 are supplied in Bulk packaging. The TO-220-5 package type remains consistent across all parts. Packaging selection may affect handling, storage, and procurement logistics.

Q: Why is the main part MIC29503BT listed as Obsolete?

A: The MIC29503BT has reached end-of-life status. The MIC29503WT serves as the active replacement from Microchip Technology, maintaining full electrical and mechanical compatibility while offering improved compliance certifications.

Q: Can I use these substitutes in applications requiring RoHS certification?

A: MIC29503WT is ROHS3 compliant and suitable for RoHS-certified applications. MIC29503BT L2 and L3 have RoHS status listed as Not applicable. Verify compliance requirements with your application specifications before selection.

Q: Are the electrical characteristics identical across all substitute parts?

A: Yes. All substitute parts maintain identical voltage specifications (Input Max 26V, Output 1.25V-25V), current rating (5A), dropout voltage (0.6V @ 5A), operating temperature range (-40°C ~ 125°C), and protection features (Over Current, Over Temperature, Reverse Polarity, Transient Voltage).

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