AP1121ASG-13 Equivalent & Substitute Parts

Part Overview

The AP1121ASG-13 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed dual-output applications. This device delivers 1A output current per channel at fixed voltages of 2.5V and 3.3V, with a maximum input voltage of 18V and dropout voltage of 1.4V at rated current. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across output voltage levels, package form factor, and thermal operating range while accounting for differences in current capacity and electrical performance characteristics.

Substiute Parts

AP1121ASG-13

Diodes IncorporatedIn Stock: 2948AP1121ASG-13 Datasheet

Current PartRFQ

AP1121ASL-13

Diodes IncorporatedIn Stock: 9360AP1121ASL-13 Datasheet

Parametric EquivalentRFQ

MIC5212-SJYM

Microchip TechnologyIn Stock: 3658MIC5212-SJYM Datasheet

MFR RecommendedRFQ

MIC5212-SJYM-TR

Microchip TechnologyIn Stock: 970MIC5212-SJYM-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the AP1121ASG-13 is based on the following critical parameters that must remain constant or compatible:

Fixed Parameters (Must Match):

• Output voltage levels: 2.5V and 3.3V dual-output configuration
• Package form factor: 8-SOIC (0.154", 3.90mm Width)
• Output configuration: Positive fixed regulation
• Mounting type: Surface Mount
• RoHS compliance: ROHS3 Compliant

Allowable Variations:

• Current output capacity: Substitute parts may have reduced current ratings if application requirements permit
• Input voltage maximum: Substitute parts may have lower maximum input voltage if within application operating range
• Dropout voltage: Lower dropout voltage in substitutes represents improved performance
• Quiescent current: Lower values represent improved efficiency
• Operating temperature range: Extended ranges provide additional design margin
• Packaging format: Tape & Reel (TR) packaging is functionally equivalent to tube packaging for component selection purposes
• Product status: Active status substitutes are preferred over obsolete parts

The AP1121ASL-13 (Diodes Incorporated) is a parametric equivalent with identical electrical specifications but active product status and Tape & Reel packaging. The MIC5212-SJYM and MIC5212-SJYM-TR (Microchip Technology) are manufacturer-recommended alternatives with reduced output current capacity but improved electrical characteristics including lower dropout voltage, lower quiescent current, and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: AP1121ASL-13

The AP1121ASL-13 is the direct parametric equivalent to the AP1121ASG-13. Both devices are manufactured by Diodes Incorporated with identical electrical specifications, output voltage levels, current capacity, and thermal characteristics. The primary distinction is product status: AP1121ASL-13 maintains active status while AP1121ASG-13 is obsolete. Packaging differs only in format (Tape & Reel versus Tube), which does not affect electrical performance or PCB-level compatibility. This substitute is recommended as the first choice for design continuity and production support.

Alternative Substitute: MIC5212-SJYM / MIC5212-SJYM-TR

The MIC5212 series from Microchip Technology represents a manufacturer-recommended alternative when AP1121ASL-13 availability is constrained. Both MIC5212 variants maintain the same dual-output voltage configuration (2.5V, 3.3V), package form factor (8-SOIC), and surface mount compatibility. Key differences include reduced output current capacity (500mA per channel versus 1A), lower maximum input voltage (16V versus 18V), and improved electrical performance characteristics including lower dropout voltage (0.6V versus 1.4V), lower quiescent current (3mA versus 10mA), and extended operating temperature range (-40°C to 125°C). MIC5212-SJYM-TR is preferred when Tape & Reel packaging is required for automated assembly.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and are classified as REACH Unaffected, ensuring regulatory compatibility with the original AP1121ASG-13 design. Selection between substitutes should prioritize application current requirements and input voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can the AP1121ASL-13 be used as a direct replacement for AP1121ASG-13?

A: Yes. The AP1121ASL-13 is a parametric equivalent with identical electrical specifications. The only differences are product status (active versus obsolete) and packaging format (Tape & Reel versus Tube). Both are pin-compatible and functionally interchangeable at the circuit level.

Q: What are the limitations when substituting with MIC5212 devices?

A: The MIC5212 series has reduced output current capacity (500mA per channel versus 1A). Applications requiring full 1A output per channel must verify that load current does not exceed 500mA. Additionally, maximum input voltage is 16V compared to 18V for the AP1121 series. Verify that your input voltage supply does not exceed 16V.

Q: Are the MIC5212-SJYM and MIC5212-SJYM-TR electrically identical?

A: Yes. Both MIC5212 variants have identical electrical specifications. The difference is packaging format: MIC5212-SJYM is supplied in Tube packaging, while MIC5212-SJYM-TR is supplied in Tape & Reel format. Select based on your assembly process requirements.

Q: Do all substitute parts maintain the same package footprint?

A: Yes. All listed substitutes use the 8-SOIC package with 0.154" (3.90mm) width. PCB footprints are identical, and no layout modifications are required.

Q: What is the advantage of the MIC5212 series over the AP1121 series?

A: The MIC5212 offers improved electrical performance including lower dropout voltage (0.6V versus 1.4V), lower quiescent current (3mA versus 10mA), higher PSRR (75dB versus 60dB), extended operating temperature range (-40°C to 125°C versus 0°C to 125°C), and additional reverse polarity protection. These improvements reduce power dissipation and provide enhanced noise rejection.

Q: Can I use MIC5212 if my application only requires 500mA per channel?

A: Yes. If your application current requirements do not exceed 500mA per channel, the MIC5212 series is a suitable substitute with the added benefit of improved electrical characteristics and active product status.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitutes (AP1121ASL-13, MIC5212-SJYM, MIC5212-SJYM-TR) are ROHS3 compliant and REACH Unaffected, maintaining regulatory compatibility with the original AP1121ASG-13 design.