AN77035SP Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The AN77035SP is a linear voltage regulator IC manufactured by Panasonic Electronic Components, designed for positive fixed output regulation at 4.6V with 1.2A output current capacity. This device operates in the Power Management (PMIC) category and is packaged in TO-252-3 (DPAK) surface mount configuration.

The AN77035SP is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

AN77035SP

Panasonic Electronic ComponentsIn Stock: 927AN77035SP Datasheet

Current PartRFQ

LD29080DT33R

STMicroelectronicsIn Stock: 80411LD29080DT33R Datasheet

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MC33275DT-3.3RKG

onsemiIn Stock: 9023MC33275DT-3.3RKG Datasheet

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NJM2885DL1-33-TE1

Nisshinbo Micro Devices Inc.In Stock: 1201NJM2885DL1-33-TE1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AN77035SP are selected based on the following critical parameters that determine functional compatibility:

• Package / Case Compatibility: All substitutes must use TO-252-3 (DPAK) surface mount packaging to ensure PCB layout and thermal management compatibility
• Output Configuration: All substitutes must provide positive fixed output regulation
• Protection Features: Substitutes must include over current and over temperature protection as minimum requirements
• Mounting Type: Surface mount configuration required for direct replacement
• Output Voltage Range: Substitutes operate at 3.3V fixed output, which represents the closest available standard voltage to the 4.6V specification
• Input Voltage Tolerance: Maximum input voltage of 13V to 14V ensures compatibility with the original design's power supply specifications

The three substitute parts identified (LD29080DT33R, MC33275DT-3.3RKG, NJM2885DL1-33-TE1) meet these core compatibility criteria, though each presents different output current capabilities and operating temperature ranges that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Selection of substitute parts must account for the following factors based on provided specifications:

LD29080DT33R (STMicroelectronics): This part is active and ROHS3 compliant. Output current of 800mA is reduced from the original 1.2A specification. This substitute is suitable for applications where load current does not exceed 800mA. The extended operating temperature range (-40°C to 125°C) provides broader environmental coverage than the original part.

MC33275DT-3.3RKG (onsemi): This part is active and ROHS3 compliant. Output current of 300mA represents the most significant reduction in current capacity among the three substitutes. This option is limited to low-current applications. The extended operating temperature range (-40°C to 125°C) matches the LD29080DT33R specification.

NJM2885DL1-33-TE1 (Nisshinbo Micro Devices Inc.): This part is active and provides the closest output current match at 500mA, though still below the original 1.2A specification. Input voltage maximum of 14V matches the original specification. Operating temperature range is limited to -40°C to 85°C, which is narrower than the original 25°C to 125°C range. This part includes short circuit protection matching the original design.

All three substitutes operate at 3.3V fixed output rather than 4.6V. Circuit design must accommodate this 0.2V reduction in output voltage or employ post-regulation if the original 4.6V specification is critical.

Frequently Asked Questions (FAQ)

Q: Why do all substitute parts operate at 3.3V instead of 4.6V?

A: The 4.6V output voltage of the AN77035SP is not a standard industry voltage. The closest standardized fixed output voltage available across multiple manufacturers is 3.3V. Circuit designs must be evaluated to determine if this 0.2V reduction is acceptable for the application.

Q: Can I use any of these substitutes as a direct 1:1 replacement?

A: Direct replacement is not possible due to reduced output current specifications. The LD29080DT33R provides 800mA (67% of original), MC33275DT-3.3RKG provides 300mA (25% of original), and NJM2885DL1-33-TE1 provides 500mA (42% of original). Selection depends on actual load current requirements in the application.

Q: Are all substitutes compatible with the same PCB layout?

A: Yes. All substitute parts use identical TO-252-3 (DPAK) packaging with the same pin configuration and thermal tab. PCB layout modifications are not required for package compatibility.

Q: What is the significance of the voltage dropout specification?

A: Voltage dropout determines the minimum input-to-output voltage differential required for proper regulation. Lower dropout values (such as NJM2885DL1-33-TE1 at 0.18V @ 300mA) allow operation with lower input voltages or provide better efficiency. This parameter becomes critical in power-constrained applications.

Q: Do all substitutes include the same protection features as the original?

A: The original AN77035SP includes over current, over temperature, and short circuit protection. LD29080DT33R and MC33275DT-3.3RKG include only over current and over temperature protection. NJM2885DL1-33-TE1 matches the original with all three protection types.

Q: What is the impact of the different operating temperature ranges?

A: The original part operates from 25°C to 125°C. LD29080DT33R and MC33275DT-3.3RKG extend the lower limit to -40°C, providing broader environmental coverage. NJM2885DL1-33-TE1 limits the upper temperature to 85°C, which may be restrictive for high-temperature applications.

Q: Are all substitutes RoHS compliant?

A: LD29080DT33R and MC33275DT-3.3RKG are explicitly ROHS3 compliant. RoHS status for NJM2885DL1-33-TE1 is not specified in the provided data.