AP1117D18L-13 Equivalent & Substitute Parts

Part Overview

The AP1117D18L-13 is a linear voltage regulator IC from Diodes Incorporated, rated for 1.8V fixed output at 1A maximum current in a TO-252-3 (DPAK) surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The AP1117D18L-13 provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for low-voltage power management applications requiring stable 1.8V rails.

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	TO-252-3 (DPAK)
Operating Temperature Range	0°C to 125°C
Protection Features	Over-Current, Over-Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AP1117D18L-13 is determined by the following critical parameters:

Fixed output voltage of 1.8V
TO-252-3 (DPAK) package compatibility
Positive output configuration
Over-current and over-temperature protection
Surface mount mounting type
RoHS3 compliance

Substitute parts must maintain the same output voltage, package footprint, and protection features. Output current ratings of 800mA or higher satisfy the 1A requirement. Maximum input voltage of 15V or higher accommodates the 18V specification. Operating temperature range must cover at minimum 0°C to 125°C.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Max Output Current	Max Input Voltage	Max Dropout @ Rated Current	Quiescent Current	Operating Temp Range	Product Status
AP1117D18L-13	Diodes Incorporated	1.8V	1A	18V	1.4V @ 1A	10 mA	0°C to 125°C	Obsolete
LD1117ADT18TR	STMicroelectronics	1.8V	1A	15V	1.3V @ 1A	10 mA	0°C to 125°C	Active
LD1117DT18CTR	STMicroelectronics	1.8V	800mA	15V	1.3V @ 800mA	10 mA	-40°C to 125°C	Active
LD1117DT18TR	STMicroelectronics	1.8V	800mA	15V	1.2V @ 800mA	10 mA	0°C to 125°C	Active
LM1117DT-1.8/NOPB	Texas Instruments	1.8V	800mA	15V	1.2V @ 800mA	5 mA	0°C to 125°C	Active
LM1117DTX-1.8/NOPB	National Semiconductor	1.8V	800mA	15V	1.2V @ 800mA	5 mA	0°C to 125°C	Active
NCP1117DT18G	onsemi	1.8V	1A	20V	1.2V @ 800mA	10 mA	0°C to 125°C	Obsolete
NCP1117DT18RKG	onsemi	1.8V	1A	20V	1.2V @ 800mA	10 mA	0°C to 125°C	Active
NCV1117DT18RKG	onsemi	1.8V	1A	20V	1.2V @ 800mA	10 mA	-40°C to 125°C	Active
NCV1117DT18T5G	onsemi	1.8V	1A	20V	1.2V @ 800mA	10 mA	-40°C to 125°C	Active

Engineering Selection Recommendations

For direct replacement of the obsolete AP1117D18L-13, the LD1117ADT18TR from STMicroelectronics is the primary equivalent. It maintains 1A output current capability, identical 1.8V output voltage, and active product status with full RoHS3 compliance. The LD1117ADT18TR operates within the same temperature range and provides superior dropout voltage performance at 1.3V versus 1.4V.

The NCP1117DT18RKG and NCV1117DT18RKG from onsemi provide active alternatives with 1A output current and extended input voltage tolerance to 20V. The NCV1117DT18RKG and NCV1117DT18T5G variants include automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C to 125°C), suitable for applications requiring enhanced reliability specifications.

For applications where 800mA output current is sufficient, the LD1117DT18TR, LM1117DT-1.8/NOPB, and LM1117DTX-1.8/NOPB offer active product status with improved dropout voltage characteristics (1.2V) and lower quiescent current in the case of Texas Instruments and National Semiconductor variants.

All recommended substitutes maintain TO-252-3 package compatibility, identical pinout, and equivalent protection features. Selection should prioritize active product status parts for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA rated part as a substitute for the 1A AP1117D18L-13?

A: Only if your application's maximum current draw does not exceed 800mA. The LD1117DT18TR, LM1117DT-1.8/NOPB, and LM1117DTX-1.8/NOPB are rated for 800mA maximum output current and are direct pin-compatible substitutes. Verify your circuit's actual current requirements before selecting an 800mA variant.

Q: What is the difference between LD1117ADT18TR and LD1117DT18TR?

A: The LD1117ADT18TR is rated for 1A output current, while LD1117DT18TR is rated for 800mA. Both use identical TO-252-3 packaging and 1.8V output voltage. The LD1117ADT18TR provides a closer electrical match to the original AP1117D18L-13 specification.

Q: Are automotive-grade variants (NCV1117DT18RKG, NCV1117DT18T5G) compatible with commercial applications?

A: Yes. Automotive-grade parts with AEC-Q100 qualification exceed commercial-grade requirements and are fully compatible with standard commercial applications. These variants offer extended temperature range (-40°C to 125°C) and enhanced reliability screening.

Q: What is the packaging difference between TR (Tape & Reel) and CT (Cut Tape) variants?

A: TR (Tape & Reel) packaging is supplied on continuous tape for automated assembly equipment. CT (Cut Tape) is supplied in smaller quantities on cut tape segments. Both use identical TO-252-3 package footprints and are electrically equivalent. Selection depends on production volume and assembly equipment compatibility.

Q: Can I substitute the AP1117D18L-13 with a part rated for higher input voltage?

A: Yes. Parts rated for 20V input (NCP1117DT18RKG, NCV1117DT18RKG, NCV1117DT18T5G) are fully compatible with circuits designed for 18V maximum input. Higher input voltage ratings provide additional design margin and are direct substitutes.

Q: What does PSRR (Power Supply Rejection Ratio) indicate for regulator selection?

A: PSRR measures the regulator's ability to reject input voltage ripple and noise. Higher PSRR values indicate better noise rejection. The AP1117D18L-13 specifies 60dB at 180Hz. Substitute parts with equal or higher PSRR values maintain or improve output voltage stability.

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