AP1117E18L-13 Equivalent & Substitute Parts

Part Overview

The AP1117E18L-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.8V output at 1A maximum current in a surface-mount SOT-223-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part operates across an input voltage range up to 18V with a maximum dropout voltage of 1.4V at full load, incorporating over-current and over-temperature protection features.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Maximum Output Current	1A
Maximum Input Voltage	18V
Maximum Dropout Voltage	1.4V @ 1A
Quiescent Current	10 mA
Package Type	SOT-223-3
Protection Features	Over Current, Over Temperature
Operating Temperature Range	0°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP1117E18L-13 is determined by the following critical parameters:

Fixed output voltage of 1.8V
SOT-223-3 package compatibility
Surface-mount mounting type
Output current capability (minimum 1A for direct replacement; 800mA variants acceptable for reduced-load applications)
Maximum input voltage rating (minimum 15V required)
Protection features (over-current and over-temperature protection required)
RoHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories: direct 1A replacements and 800mA variants suitable for applications with lower current demands. All listed substitutes maintain the 1.8V fixed output voltage and SOT-223 package footprint compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Output Current	Max Input Voltage	Max Dropout @ Rated Current	Quiescent Current	Operating Temperature	Product Status
AP1117E18L-13	Diodes Incorporated	1A	18V	1.4V @ 1A	10 mA	0°C to 125°C	Obsolete
AZ1117CH-1.8TRG1	Diodes Incorporated	1A	15V	1.3V @ 800mA	6 mA	-20°C to 125°C	Active
LD1117AS18TR	STMicroelectronics	1A	15V	1.3V @ 1A	10 mA	0°C to 125°C	Active
LD1117S18CTR	STMicroelectronics	800mA	15V	1.3V @ 800mA	10 mA	-40°C to 125°C	Active
LD1117S18TR	STMicroelectronics	800mA	15V	1.2V @ 800mA	10 mA	0°C to 125°C	Active
LM1117MP-1.8/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	0°C to 125°C	Active
LM1117MPX-1.8/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	0°C to 125°C	Active
MCP1703-1802E/DB	Microchip Technology	200mA	16V	Not specified	5 µA	-40°C to 125°C	Active
MCP1703T-1802E/DB	Microchip Technology	200mA	16V	Not specified	5 µA	-40°C to 125°C	Active
NCP1117ST18T3G	onsemi	1A	20V	1.2V @ 800mA	10 mA	0°C to 125°C	Active
REG1117A-1.8	Texas Instruments	1A	15V	1.55V @ 1A	10 mA	-40°C to 125°C	Active

Engineering Selection Recommendations

For direct replacement of the AP1117E18L-13 in applications requiring full 1A output current, the following active parts are recommended based on product status and compliance:

LD1117AS18TR (STMicroelectronics) provides the closest electrical match with 1A output capability, identical quiescent current, and matching operating temperature range. NCP1117ST18T3G (onsemi) offers superior input voltage rating (20V) and lower dropout voltage at 800mA operation. REG1117A-1.8 (Texas Instruments) supports extended temperature range (-40°C to 125°C) with 1A output capacity.

For applications with reduced current requirements (800mA or less), LD1117S18CTR and LD1117S18TR (STMicroelectronics) or LM1117MP-1.8/NOPB and LM1117MPX-1.8/NOPB (Texas Instruments) are suitable alternatives, offering lower dropout voltages and reduced quiescent current in some variants.

For ultra-low quiescent current applications below 200mA, MCP1703-1802E/DB or MCP1703T-1802E/DB (Microchip Technology) provide 5 µA quiescent current with extended temperature range support.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA rated part as a direct replacement for the AP1117E18L-13?

A: 800mA variants are suitable only if your application draws 800mA or less. The AP1117E18L-13 is rated for 1A output; using a lower-rated part in a 1A application will cause thermal stress and potential failure.

Q: What is the significance of the SOT-223-3 package designation?

A: SOT-223-3 refers to a three-pin surface-mount package. All listed substitutes use SOT-223 packaging, ensuring PCB footprint compatibility. Verify your board layout supports the specific pin configuration of your chosen substitute.

Q: Why do some substitutes have lower maximum input voltage ratings than the AP1117E18L-13?

A: The AP1117E18L-13 accepts up to 18V input, while most substitutes are rated for 15V. If your circuit supplies more than 15V, select NCP1117ST18T3G (20V rating) or verify your actual input voltage does not exceed the substitute's rating.

Q: What is the difference between dropout voltage specifications at different current levels?

A: Dropout voltage increases with output current. The AP1117E18L-13 specifies 1.4V @ 1A. Substitutes with lower dropout voltages (1.2V to 1.3V) provide better efficiency and reduced heat dissipation at the same current levels.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the environmental compliance status of the original AP1117E18L-13.

Q: Which substitute offers the lowest quiescent current?

A: MCP1703-1802E/DB and MCP1703T-1802E/DB offer 5 µA quiescent current, significantly lower than the AP1117E18L-13 (10 mA). However, these parts are limited to 200mA output current and are suitable only for low-power applications.

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