MIC29300-12BU Equivalent & Substitute Parts

Part Overview

The MIC29300-12BU is a linear voltage regulator IC from Microchip Technology designed for positive fixed 12V output at 3A in a TO-263-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MIC29300-12BU provides regulated 12V output with integrated protection features including over-current, over-temperature, reverse polarity, and transient voltage protection across an operating temperature range of -40°C to 125°C.

Substiute Parts

MIC29300-12BU

Microchip TechnologyIn Stock: 3762MIC29300-12BU Datasheet

Current PartRFQ

MIC29300-12WU

Microchip TechnologyIn Stock: 1360MIC29300-12WU Datasheet

DirectRFQ

LM2937ES-12/NOPB

Texas InstrumentsIn Stock: 2687LM2937ES-12/NOPB Datasheet

MFR RecommendedRFQ

LM2937ESX-12/NOPB

Texas InstrumentsIn Stock: 2420LM2937ESX-12/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC29300-12BU are selected based on the following critical parameters that determine functional compatibility:

• Output voltage fixed at 12V
• Surface mount TO-263-3 package compatibility
• Operating temperature range -40°C to 125°C
• Positive output configuration with fixed output type
• Protection features: Over-current, over-temperature, reverse polarity, and transient voltage protection

The MIC29300-12WU serves as a direct equivalent from the same manufacturer with identical electrical specifications but active product status and improved RoHS compliance. The Texas Instruments LM2937ES-12/NOPB and LM2937ESX-12/NOPB are cross-manufacturer alternatives that maintain the same output voltage, package form factor, and operating temperature range, though with reduced output current capability (500mA vs 3A) and different voltage dropout characteristics.

Parameter Comparison

Engineering Selection Recommendations

The MIC29300-12WU is the primary substitute for the MIC29300-12BU. Both parts are manufactured by Microchip Technology with identical electrical specifications and package form factor. The MIC29300-12WU offers the advantage of active product status and ROHS3 compliance, making it suitable for new designs and applications requiring regulatory compliance.

The Texas Instruments LM2937ES-12/NOPB and LM2937ESX-12/NOPB are alternative substitutes that maintain the same 12V output voltage, TO-263 package compatibility, and operating temperature range. However, these parts are rated for 500mA maximum output current compared to the 3A rating of the MIC29300-12BU. Selection of these alternatives requires verification that the application current requirements do not exceed 500mA. Both Texas Instruments parts are active products with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the MIC29300-12WU be used as a direct replacement for the MIC29300-12BU?

A: Yes. The MIC29300-12WU is a direct equivalent with identical output voltage (12V), output current (3A), voltage dropout (0.6V @ 3A), package (TO-263-3), and operating temperature range (-40°C to 125°C). The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What are the limitations of using LM2937ES-12/NOPB or LM2937ESX-12/NOPB as substitutes?

A: The Texas Instruments LM2937 series parts are rated for 500mA maximum output current, compared to 3A for the MIC29300-12BU. These parts are suitable only for applications requiring 500mA or less. The voltage dropout is also higher at 1V @ 500mA versus 0.6V @ 3A for the Microchip part.

Q: Are all substitute parts compatible with the same PCB layout?

A: All substitute parts use the TO-263 package family (D2PAK with 3 leads plus tab), which maintains the same pin configuration and footprint compatibility. PCB layout modifications are not required for package compatibility.

Q: What is the difference between MIC29300-12WU packaging options?

A: The MIC29300-12WU is available in Tube packaging. The LM2937ES-12/NOPB is supplied in Tube packaging, while the LM2937ESX-12/NOPB is supplied in Cut Tape (CT) & Digi-Reel packaging. Packaging selection depends on procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: The MIC29300-12WU, LM2937ES-12/NOPB, and LM2937ESX-12/NOPB are all ROHS3 compliant. The original MIC29300-12BU is RoHS non-compliant. For applications requiring RoHS compliance, any of the three substitute parts are acceptable.