AP1117E25L-13 Equivalent & Substitute Parts

Part Overview

The AP1117E25L-13 is a linear voltage regulator IC from Diodes Incorporated, rated for 2.5V fixed output at 1A maximum current in SOT-223-3 surface mount packaging. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers positive fixed output regulation with integrated over-current and over-temperature protection across an operating temperature range of 0°C to 125°C.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	1A
Input Voltage (Max)	18V
Dropout Voltage (Max)	1.4V @ 1A
Quiescent Current	10 mA
PSRR	60dB (180Hz)
Package	SOT-223-3
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution eligibility for the AP1117E25L-13 is determined by the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 1A or greater
SOT-223 package compatibility (TO-261-4 or TO-261AA case)
Positive output configuration
Over-current and over-temperature protection
Surface mount mounting type
Maximum input voltage of 15V or greater

Substitute parts are grouped into two categories based on output current rating: full 1A-rated devices and 800mA-rated devices. The 800mA devices are acceptable substitutes where the application does not require the full 1A output current of the original part.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	PSRR	Operating Temperature	Product Status
AP1117E25L-13	Diodes Incorporated	1A	18V	1.4V @ 1A	10 mA	60dB (180Hz)	0°C ~ 125°C	Obsolete
LD1117S25CTR	STMicroelectronics	800mA	15V	1.3V @ 800mA	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active
LD1117S25TR	STMicroelectronics	800mA	15V	1.2V @ 800mA	10 mA	75dB (120Hz)	0°C ~ 125°C	Active
LM1117MP-2.5/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active
LM1117MPX-2.5/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active
NCP1117ST25T3G	onsemi	1A	20V	1.2V @ 800mA	10 mA	68dB (120Hz)	0°C ~ 125°C	Active
NCV1117ST25T3G	onsemi	1A	20V	1.2V @ 800mA	10 mA	68dB (120Hz)	-40°C ~ 125°C	Active
REG1117A-2.5	Texas Instruments	1A	15V	1.55V @ 1A	10 mA	62dB (120Hz)	-40°C ~ 125°C	Last Time Buy
REG1117A-2.5/2K5	Texas Instruments	1A	15V	1.55V @ 1A	10 mA	62dB (120Hz)	-40°C ~ 125°C	Last Time Buy
SPX1117M3-L-2-5/TR	MaxLinear, Inc.	800mA	20V	1.3V @ 800mA	10 mA	70dB (120Hz)	-40°C ~ 125°C	Active
TLV1117-25CDCY	Texas Instruments	800mA	15V	1.3V @ 800mA	10 mA	75dB (120Hz)	0°C ~ 125°C	Active

Engineering Selection Recommendations

For applications requiring full 1A output current capability with active product status, NCP1117ST25T3G and NCV1117ST25T3G from onsemi are preferred substitutes. Both devices deliver 1A output current, feature improved input voltage tolerance (20V maximum), and maintain the same quiescent current specification as the original part. NCV1117ST25T3G includes automotive-grade qualification (AEC-Q100) and extended operating temperature range (-40°C to 125°C), suitable for demanding environments.

For applications where 800mA output current is sufficient, LD1117S25TR from STMicroelectronics offers the lowest dropout voltage (1.2V @ 800mA) and highest PSRR (75dB), with active product status and broad inventory availability. LM1117MP-2.5/NOPB and LM1117MPX-2.5/NOPB from Texas Instruments provide equivalent performance with reduced quiescent current (5 mA) and active status.

REG1117A-2.5 and REG1117A-2.5/2K5 from Texas Instruments maintain 1A output current and extended temperature range but carry Last Time Buy status, limiting their suitability for new long-term production programs.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA-rated substitute in place of the 1A-rated AP1117E25L-13?

A: Yes, provided your application does not require output current exceeding 800mA. The 800mA devices (LD1117S25CTR, LD1117S25TR, LM1117MP-2.5/NOPB, LM1117MPX-2.5/NOPB, SPX1117M3-L-2-5/TR, TLV1117-25CDCY) are electrically compatible and deliver the same 2.5V fixed output voltage. Verify your circuit's maximum current draw before selection.

Q: Are all substitute parts in SOT-223 packaging?

A: Yes. All listed substitutes use SOT-223 surface mount packaging (TO-261-4 or TO-261AA case), ensuring mechanical and thermal compatibility with the original AP1117E25L-13 footprint.

Q: What is the difference between NCP1117ST25T3G and NCV1117ST25T3G?

A: Both devices are functionally identical 1A regulators with identical electrical specifications. NCV1117ST25T3G includes automotive-grade qualification (AEC-Q100) and operates across -40°C to 125°C, while NCP1117ST25T3G operates 0°C to 125°C. Select NCV1117ST25T3G for automotive or extended temperature applications.

Q: Why do some substitutes have higher maximum input voltage ratings?

A: NCP1117ST25T3G, NCV1117ST25T3G, and SPX1117M3-L-2-5/TR support 20V maximum input, compared to the original part's 18V. This provides additional design margin and is not a limitation for applications designed for the original 18V specification.

Q: Which substitute offers the best power supply rejection ratio (PSRR)?

A: LD1117S25CTR, LD1117S25TR, LM1117MP-2.5/NOPB, LM1117MPX-2.5/NOPB, and TLV1117-25CDCY all deliver 75dB PSRR at 120Hz, superior to the original part's 60dB at 180Hz.

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