AP1117D25G-13 Equivalent & Substitute Parts

Part Overview

The AP1117D25G-13 is a linear voltage regulator IC from Diodes Incorporated designed to deliver a fixed 2.5V output at 1A maximum current in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The AP1117D25G-13 functions as a positive fixed output regulator with integrated over-current and over-temperature protection. Its 1.4V maximum dropout voltage at 1A output current and 60dB PSRR at 180Hz make it suitable for applications requiring stable low-voltage power delivery with moderate noise rejection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Maximum Output Current	1A
Maximum Input Voltage	18V
Maximum Dropout Voltage	1.4V @ 1A
Quiescent Current	10 mA
PSRR	60dB (180Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-252-3 (DPAK)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AP1117D25G-13 is determined by the following critical parameters:

Fixed output voltage of 2.5V
TO-252-3 (DPAK) package compatibility
Surface mount mounting type
Positive output configuration
Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Identical Specifications) Parts that maintain the same electrical specifications and package as the main part, differing only in packaging format (tape & reel vs. cut tape).

Category 2: Functional Equivalents (Active Alternatives) Parts from different manufacturers with active product status that deliver the same 2.5V fixed output in the same package, with comparable or superior electrical performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Max Output Current	Max Input Voltage	Dropout Voltage (Max)	Quiescent Current	PSRR	Product Status	Package
AP1117D25G-13	Diodes Incorporated	2.5V	1A	18V	1.4V @ 1A	10 mA	60dB (180Hz)	Obsolete	TO-252-3
AP1117D25L-13	Diodes Incorporated	2.5V	1A	18V	1.4V @ 1A	10 mA	60dB (180Hz)	Obsolete	TO-252-3
AZ1117CD-2.5TRG1	Diodes Incorporated	2.5V	1A	15V	1.4V @ 800mA	6 mA	70dB (120Hz)	Active	TO-252-3
LD1117DT25CTR	STMicroelectronics	2.5V	800mA	15V	1.3V @ 800mA	10 mA	75dB (120Hz)	Active	TO-252-3
LD1117DT25TR	STMicroelectronics	2.5V	800mA	15V	1.2V @ 800mA	10 mA	75dB (120Hz)	Active	TO-252-3
LM1117DT-2.5/NOPB	National Semiconductor	2.5V	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	Active	TO-252-3
LM1117DTX-2.5/NOPB	Texas Instruments	2.5V	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	Active	TO-252-3
NCP1117DT25G	onsemi	2.5V	1A	20V	1.2V @ 800mA	10 mA	68dB (120Hz)	Obsolete	TO-252-3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): AP1117D25L-13 is the direct parametric equivalent, differing only in packaging format (cut tape vs. unspecified). Both parts are obsolete with identical electrical performance.

For Active Product Alternatives: AZ1117CD-2.5TRG1 from Diodes Incorporated is the manufacturer-recommended substitute with active product status. It delivers superior PSRR (70dB vs. 60dB) and lower quiescent current (6mA vs. 10mA), though maximum input voltage is reduced to 15V and output current is rated at 1A with 800mA dropout specification.

LD1117DT25TR and LD1117DT25CTR from STMicroelectronics are active alternatives with improved dropout voltage performance (1.2V and 1.3V respectively at 800mA) and higher PSRR (75dB). Output current is specified at 800mA, which may be limiting for applications requiring full 1A delivery.

LM1117DT-2.5/NOPB and LM1117DTX-2.5/NOPB from National Semiconductor and Texas Instruments respectively offer the lowest quiescent current (5mA) and active product status. These are suitable for applications where the 800mA output current specification is acceptable.

NCP1117DT25G from onsemi is an obsolete alternative with 1A output current capability and the highest maximum input voltage (20V), but lacks active product support.

All substitute parts maintain TO-252-3 package compatibility, surface mount mounting, positive output configuration, and integrated protection features. Selection should prioritize active product status for long-term availability and support.

Frequently Asked Questions (FAQ)

Q: Can AP1117D25L-13 be used as a direct replacement for AP1117D25G-13? A: Yes. Both parts are parametric equivalents from Diodes Incorporated with identical electrical specifications. The difference is packaging format only (cut tape vs. unspecified). Both are obsolete.

Q: What is the primary limitation when substituting with LD1117DT25TR or LM1117DT-2.5/NOPB? A: The maximum output current is reduced from 1A to 800mA. These parts are suitable only if your application requires 800mA or less. The dropout voltage specification is also defined at 800mA rather than 1A.

Q: Why is AZ1117CD-2.5TRG1 recommended as the primary active substitute? A: AZ1117CD-2.5TRG1 is manufacturer-recommended by Diodes Incorporated with active product status, ensuring long-term availability. It maintains 1A output current capability and improves upon the original design with lower quiescent current and superior PSRR performance.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the AP1117D25G-13.

Q: What is the difference between LD1117DT25CTR and LD1117DT25TR? A: Both are STMicroelectronics LD1117 variants with identical electrical specifications. LD1117DT25CTR is supplied in cut tape & Digi-Reel format, while LD1117DT25TR is supplied in tape & reel format. The dropout voltage specification differs slightly (1.3V vs. 1.2V at 800mA).

Q: Can NCP1117DT25G be used despite obsolete status? A: NCP1117DT25G is functionally compatible with 1A output current and the highest input voltage rating (20V). However, obsolete status limits future procurement and support. Active alternatives are preferred for new designs.

Q: What is the impact of reduced maximum input voltage in AZ1117CD-2.5TRG1? A: AZ1117CD-2.5TRG1 has a maximum input voltage of 15V compared to 18V in the original part. This is acceptable for most applications but may be limiting if your power supply exceeds 15V. Verify your input voltage requirements before selection.

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