AP1122KG-13 Equivalent & Substitute Parts

Part Overview

The AP1122KG-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed output regulation at 1.2V with 1A output current capacity. This device operates in the TO-263-2 surface mount package and is classified as obsolete. Due to its obsolete status and limited availability for new designs, identifying functionally compatible substitute components is essential for system continuity and design flexibility.

Substiute Parts

AP1122KG-13

Diodes IncorporatedIn Stock: 14338AP1122KG-13 Datasheet

Current PartRFQ

LM1086CSX-ADJ/NOPB

Texas InstrumentsIn Stock: 16264LM1086CSX-ADJ/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1122KG-13 is determined by the following critical parameters:

• Output Configuration & Type: Positive fixed output at 1.2V minimum
• Current Capacity: Minimum 1A output current requirement
• Voltage Input Range: Maximum input voltage of 12V or higher
• Voltage Dropout: Maximum dropout voltage compatible with system design
• Package Compatibility: TO-263 family packages (surface mount)
• Protection Features: Over current and over temperature protection
• Operating Temperature Range: 0°C to 125°C minimum
• Compliance: ROHS3 compliance for regulatory alignment

The LM1086CSX-ADJ/NOPB from Texas Instruments qualifies as a substitute because it maintains positive output configuration, exceeds the 1A current requirement (1.5A), supports the required 1.2V minimum output voltage, operates within the specified temperature range, and is housed in a compatible TO-263 package. The adjustable output type of the substitute provides functional equivalence when configured to 1.2V fixed output.

Parameter Comparison

Engineering Selection Recommendations

The LM1086CSX-ADJ/NOPB is suitable as a substitute for the obsolete AP1122KG-13 based on the following engineering criteria:

• Product Status Alignment: The substitute is active and in production, ensuring long-term availability and supply chain stability compared to the obsolete main part.
• Regulatory Compliance: Both components maintain ROHS3 compliance, satisfying environmental and regulatory requirements.
• Performance Enhancement: The substitute provides superior specifications including higher output current capacity (1.5A vs. 1A), improved PSRR (75dB vs. 60dB), lower quiescent current (5mA vs. 10mA), and additional short circuit protection.
• Package Consideration: The substitute uses TO-263-4 (3 Leads + Tab) versus the main part's TO-263-3 (2 Leads + Tab). PCB layout modification is required to accommodate the additional lead.
• Configuration Requirement: The adjustable output type requires external resistor network configuration to establish the fixed 1.2V output voltage, adding minimal design complexity.

Frequently Asked Questions (FAQ)

Q: Can the LM1086CSX-ADJ/NOPB directly replace the AP1122KG-13 without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (TO-263-3 vs. TO-263-4). The substitute requires PCB layout modification and external resistor configuration for fixed 1.2V output operation. However, functional equivalence is achievable with proper circuit design.

Q: What is the primary reason for substitution?

A: The AP1122KG-13 is classified as obsolete, limiting availability for new production and long-term supply assurance. The LM1086CSX-ADJ/NOPB is an active product from a major manufacturer, providing design continuity and component availability.

Q: Are there any performance trade-offs when using the substitute?

A: No significant trade-offs exist. The substitute exceeds the main part's specifications in output current capacity, PSRR, quiescent current, and protection features. The maximum dropout voltage increases marginally (1.5V vs. 1.3V), which remains acceptable for most 12V input applications.

Q: How does the adjustable output type affect circuit design?

A: The adjustable output requires external resistor divider network configuration to set the 1.2V output voltage. This adds minimal component count and design complexity compared to fixed output regulators, while providing flexibility for future output voltage adjustments if needed.

Q: Are both components RoHS compliant?

A: Yes, both the AP1122KG-13 and LM1086CSX-ADJ/NOPB are ROHS3 compliant, meeting environmental and regulatory standards for electronic component manufacturing and use.

Q: What is the impact of the higher maximum input voltage rating on the substitute?

A: The LM1086CSX-ADJ/NOPB supports 29V maximum input versus 12V for the main part. This provides greater design flexibility and allows use in higher voltage applications without component change, though the 12V input specification of the original application remains fully supported.