MIC2954-03YZ Equivalent & Substitute Parts

Part Overview

The MIC2954-03YZ is a linear voltage regulator IC from Microchip Technology designed for positive fixed 5V output at 250mA in a TO-92-3 package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MIC2954-03YZ provides load dump, over current, over temperature, reverse polarity, and UV POR protection features suitable for general-purpose voltage regulation applications.

Substiute Parts

MIC2954-03YZ

Microchip TechnologyIn Stock: 662MIC2954-03YZ Datasheet

Current PartRFQ

LP2950-50LPRE3

Texas InstrumentsIn Stock: 37272LP2950-50LPRE3 Datasheet

MFR RecommendedRFQ

LT1121CZ-5#PBF

Analog Devices Inc.In Stock: 1094LT1121CZ-5#PBF Datasheet

MFR RecommendedRFQ

LT1121IZ-5#PBF

Linear TechnologyIn Stock: 1384LT1121IZ-5#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC2954-03YZ are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Critical Matching Parameters:

• Output voltage: 5V fixed
• Package type: TO-92-3 (TO-226-3)
• Mounting type: Through Hole
• Input voltage rating: 30V maximum
• Operating temperature range: -40°C to 125°C
• Output configuration: Positive fixed regulator
• RoHS3 compliance

Acceptable Variation Parameters:

• Output current capacity: Substitute parts may have lower current ratings if the application does not require the full 250mA
• Dropout voltage: Variations acceptable within the 30V input specification
• Quiescent current: Lower values are acceptable
• Protection features: Substitute parts may have different protection feature sets

The three substitute parts listed below meet all critical matching parameters and are therefore electrically and mechanically compatible with the MIC2954-03YZ in applications where output current requirements do not exceed the substitute part's rating.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance and REACH unaffected status, providing long-term availability and regulatory compliance advantages over the obsolete MIC2954-03YZ.

LP2950-50LPRE3 (Texas Instruments): This part is suitable for applications requiring up to 100mA output current. It maintains the same 30V input maximum and 5V fixed output as the original part. The lower quiescent current (120 µA) provides improved efficiency in low-power standby conditions. This part is recommended for designs where output current does not exceed 100mA.

LT1121CZ-5#PBF (Analog Devices Inc.): This part supports up to 150mA output current and includes an Enable control feature. The quiescent current is significantly lower at 50 µA. The operating temperature range is 0°C to 125°C, which is narrower than the original part. This part is suitable for applications requiring 100mA to 150mA output current within the 0°C to 125°C temperature range.

LT1121IZ-5#PBF (Linear Technology): This part also supports 150mA output current with 50 µA quiescent current and includes Enable control. It maintains the full -40°C to 125°C operating temperature range of the original part. This part is the most direct functional equivalent for applications requiring up to 150mA output current across the full temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use LP2950-50LPRE3 as a direct replacement for MIC2954-03YZ?

A: The LP2950-50LPRE3 is electrically and mechanically compatible with the MIC2954-03YZ in the same TO-92-3 package. However, it is rated for 100mA maximum output current compared to the original 250mA. Use this substitute only if your application requires 100mA or less.

Q: What is the difference between LT1121CZ-5#PBF and LT1121IZ-5#PBF?

A: Both parts provide 150mA output current and identical electrical characteristics. The primary difference is the operating temperature range: LT1121CZ-5#PBF operates from 0°C to 125°C, while LT1121IZ-5#PBF operates from -40°C to 125°C. Select LT1121IZ-5#PBF if your application requires operation below 0°C.

Q: Are all substitute parts in the same package as the original MIC2954-03YZ?

A: Yes. All substitute parts use the TO-92-3 (TO-226-3) through-hole package, ensuring mechanical compatibility and direct pin-for-pin replacement capability.

Q: What if my application requires the full 250mA output current of the MIC2954-03YZ?

A: None of the listed substitute parts provide 250mA output current. The maximum available from the substitutes is 150mA (LT1121CZ-5#PBF and LT1121IZ-5#PBF). For applications requiring 250mA, alternative regulator families with higher current ratings must be evaluated.

Q: Do all substitute parts have the same protection features as the original?

A: No. The MIC2954-03YZ includes load dump, over current, over temperature, reverse polarity, and UV POR protection. The substitute parts have different protection feature sets. LP2950-50LPRE3 includes over current and over temperature protection. LT1121CZ-5#PBF and LT1121IZ-5#PBF include over temperature and reverse polarity protection. Verify that the protection features of your selected substitute meet your application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.