AP2138N-1.2TRG1 Equivalent & Substitute Parts

Part Overview

The AP2138N-1.2TRG1 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed 1.2V output applications with 250mA current capacity in a SOT-23-3 surface mount package. This Active product provides regulated power supply functionality in compact form factor suitable for portable and embedded systems. Substitute parts are identified to address inventory availability, extended operating temperature ranges, or alternative sourcing requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

AP2138N-1.2TRG1

Diodes IncorporatedIn Stock: 49670AP2138N-1.2TRG1 Datasheet

Current PartRFQ

MCP1700T-1202E/TT

Microchip TechnologyIn Stock: 6376MCP1700T-1202E/TT Datasheet

MFR RecommendedRFQ

S-1206B12-M3T1U

ABLIC Inc.In Stock: 6120S-1206B12-M3T1U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP2138N-1.2TRG1 are qualified based on the following critical parameters:

• Fixed output voltage of 1.2V
• SOT-23-3 package compatibility
• Surface mount configuration
• Positive output configuration
• Over current protection capability
• ROHS3 compliance and REACH unaffected status
• Active product status

The MCP1700T-1202E/TT and S-1206B12-M3T1U meet these core substitution criteria. Variations in output current capacity, dropout voltage, quiescent current, and maximum input voltage are documented in the parameter comparison table to enable informed selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Selection between AP2138N-1.2TRG1, MCP1700T-1202E/TT, and S-1206B12-M3T1U depends on application-specific requirements:

The MCP1700T-1202E/TT provides extended operating temperature range to 125°C and enhanced protection features including over temperature and short circuit protection, with reduced dropout voltage of 0.35V @ 200mA. Output current is limited to 200mA, requiring verification against application current demands.

The S-1206B12-M3T1U maintains 250mA output current matching the original part, with operating temperature range of -40°C ~ 85°C identical to AP2138N-1.2TRG1. Maximum input voltage extends to 6.5V, providing additional headroom. Dropout voltage is 0.81V @ 100mA.

The AP2138N-1.2TRG1 original part specifies 1.3V dropout voltage @ 250mA with 1.5 µA quiescent current and 6V maximum input voltage.

Frequently Asked Questions (FAQ)

Q: Can MCP1700T-1202E/TT replace AP2138N-1.2TRG1 in all applications?

A: MCP1700T-1202E/TT is electrically compatible for 1.2V fixed output applications in SOT-23-3 package. However, output current is limited to 200mA versus 250mA of the original part. Applications requiring full 250mA output current must use AP2138N-1.2TRG1 or S-1206B12-M3T1U.

Q: What is the difference in dropout voltage between these parts?

A: Dropout voltage varies significantly: MCP1700T-1202E/TT provides 0.35V @ 200mA, S-1206B12-M3T1U provides 0.81V @ 100mA, and AP2138N-1.2TRG1 provides 1.3V @ 250mA. Lower dropout voltage reduces power dissipation and allows operation with lower input voltages.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use SOT-23-3 package (TO-236-3, SC-59) with identical pinout for surface mount applications.

Q: Which substitute part offers the widest operating temperature range?

A: MCP1700T-1202E/TT operates from -40°C to 125°C, extending 40°C above the original AP2138N-1.2TRG1 and S-1206B12-M3T1U which both operate to 85°C maximum.

Q: Do all parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and classified as Active products with unlimited moisture sensitivity level (MSL 1).