MIC2954-02YZ Equivalent & Substitute Parts

Part Overview

The MIC2954-02YZ is a linear voltage regulator IC from Microchip Technology designed for positive fixed 5V output at 250mA in a TO-92-3 package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The MIC2954-02YZ provides essential power management functionality with integrated protection features including load dump, over-current, over-temperature, reverse polarity, and UV power-on reset protection.

Substiute Parts

MIC2954-02YZ

Microchip TechnologyIn Stock: 12959MIC2954-02YZ 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

Substitution for the MIC2954-02YZ is determined by the following critical parameters that must align with the original part specifications:

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

The substitute parts listed below maintain compatibility across these core parameters. However, output current capacity varies among substitutes, which affects application suitability based on load requirements. The LP2950-50LPRE3 provides 100mA output, while both LT1121 variants (LT1121CZ-5#PBF and LT1121IZ-5#PBF) provide 150mA output. These reduced current ratings compared to the original 250mA specification require circuit-level evaluation for compatibility.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original MIC2954-02YZ specification.

The LP2950-50LPRE3 from Texas Instruments is suitable for applications requiring up to 100mA output current. This part features lower quiescent current (120 µA) compared to the original, reducing standby power consumption. The LP2950-50LPRE3 maintains the full -40°C to 125°C operating temperature range and is currently in active production status.

The LT1121CZ-5#PBF from Analog Devices Inc. provides 150mA output capacity with significantly reduced quiescent current (50 µA). This part includes an enable control feature and operates across the -40°C to 125°C range, though the specified operating temperature minimum is 0°C. The LT1121CZ-5#PBF is actively produced and available in bag packaging.

The LT1121IZ-5#PBF from Linear Technology is functionally equivalent to the LT1121CZ-5#PBF, providing 150mA output with 50 µA quiescent current and full -40°C to 125°C operating temperature coverage. This variant is supplied in bulk packaging and maintains active production status.

Selection between these substitutes depends on load current requirements. Applications drawing up to 100mA should use the LP2950-50LPRE3. Applications requiring 100mA to 150mA should use either LT1121 variant. Applications exceeding 150mA output current cannot be directly substituted and require alternative regulator selection.

Frequently Asked Questions (FAQ)

Q: Can the LP2950-50LPRE3 directly replace the MIC2954-02YZ in all applications?

A: The LP2950-50LPRE3 is a direct package and pinout replacement for the MIC2954-02YZ in the TO-92-3 package. However, the reduced output current rating (100mA versus 250mA) limits its use to applications drawing 100mA or less. Circuit-level load analysis is required to confirm compatibility.

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

A: Both parts are functionally identical linear voltage regulators with 150mA output capacity, 5V fixed output, and identical electrical specifications. The primary differences are packaging format (bag versus bulk) and operating temperature range specification (0°C to 125°C for the CZ variant versus -40°C to 125°C for the IZ variant). The IZ variant is preferred for applications requiring full -40°C operation.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All substitute parts listed are available in TO-226-3 and TO-92-3 (TO-226AA) packages with through-hole mounting, ensuring mechanical and electrical compatibility with the original MIC2954-02YZ footprint.

Q: Do the substitute parts maintain the same protection features as the MIC2954-02YZ?

A: The substitute parts provide over-temperature and reverse polarity protection. The MIC2954-02YZ includes additional load dump and UV power-on reset protection features not specified in the substitute parts. Application designs relying on these specific protection mechanisms require detailed datasheet review and potential circuit modifications.

Q: Which substitute part has the lowest quiescent current?

A: Both LT1121 variants (LT1121CZ-5#PBF and LT1121IZ-5#PBF) feature 50 µA quiescent current, compared to 300 µA for the original MIC2954-02YZ and 120 µA for the LP2950-50LPRE3. The LT1121 variants are preferred for battery-powered or low-power standby applications.

Q: What is the maximum input voltage for all parts?

A: All parts, including the MIC2954-02YZ and all substitutes, support a maximum input voltage of 30V, maintaining consistent input voltage range compatibility across the product family.