AP1117D18G-13 Equivalent & Substitute Parts

Part Overview

The AP1117D18G-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 TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The AP1117D18G-13 provides positive fixed output regulation with integrated over-current and over-temperature protection, making it suitable for low-voltage power supply applications requiring thermal management and current limiting.

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
PSRR	60dB (180Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature Range	0°C to 125°C
Package Type	TO-252-3 (DPAK)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AP1117D18G-13 is determined by the following critical parameters:

Fixed output voltage of 1.8V
Output current capability (1A nominal, with some variants rated at 800mA)
Maximum input voltage tolerance (15V to 20V acceptable)
Dropout voltage performance at rated current
Package compatibility (TO-252-3 DPAK form factor)
Protection features (over-current and over-temperature shutdown)
Surface mount mounting type
RoHS3 compliance and MSL rating

Substitute parts must maintain the 1.8V fixed output and TO-252-3 package footprint. Variants with 800mA output current are acceptable where system design permits reduced current headroom. Input voltage ratings between 15V and 20V are functionally equivalent for most applications. Dropout voltage differences are acceptable provided the application's input-to-output voltage margin accommodates the specified dropout at operating current.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Max Input Voltage	Dropout @ Rated Current	Iq (mA)	PSRR (dB)	Operating Temp	Product Status
AP1117D18G-13	Diodes Inc.	1.8V	1A	18V	1.4V @ 1A	10	60 (180Hz)	0 to 125°C	Obsolete
AZ1117CD-1.8TRG1	Diodes Inc.	1.8V	1A	15V	1.4V @ 800mA	6	70 (120Hz)	-20 to 125°C	Active
LD1117ADT18TR	STMicroelectronics	1.8V	1A	15V	1.3V @ 1A	10	80 (120Hz)	0 to 125°C	Active
LD1117DT18CTR	STMicroelectronics	1.8V	800mA	15V	1.3V @ 800mA	10	75 (120Hz)	-40 to 125°C	Active
LD1117DT18TR	STMicroelectronics	1.8V	800mA	15V	1.2V @ 800mA	10	75 (120Hz)	0 to 125°C	Active
LM1117DT-1.8/NOPB	Texas Instruments	1.8V	800mA	15V	1.2V @ 800mA	5	75 (120Hz)	0 to 125°C	Active
LM1117DTX-1.8/NOPB	National Semiconductor	1.8V	800mA	15V	1.2V @ 800mA	5	75 (120Hz)	0 to 125°C	Active
NCP1117DT18G	onsemi	1.8V	1A	20V	1.2V @ 800mA	10	70 (120Hz)	0 to 125°C	Obsolete
NCP1117DT18RKG	onsemi	1.8V	1A	20V	1.2V @ 800mA	10	70 (120Hz)	0 to 125°C	Active
NCV1117DT18RKG	onsemi	1.8V	1A	20V	1.2V @ 800mA	10	70 (120Hz)	-40 to 125°C	Active
NCV1117DT18T5G	onsemi	1.8V	1A	20V	1.2V @ 800mA	10	70 (120Hz)	-40 to 125°C	Active

Engineering Selection Recommendations

For direct replacement of the obsolete AP1117D18G-13, the following selection criteria apply:

Primary Equivalents (1A Output Current): LD1117ADT18TR and NCP1117DT18RKG maintain the full 1A output current specification and are both active products with RoHS3 compliance. LD1117ADT18TR from STMicroelectronics offers improved dropout voltage (1.3V @ 1A) and higher PSRR (80dB). NCP1117DT18RKG from onsemi provides extended input voltage tolerance (20V maximum) and is available in high volume.

Extended Temperature Range: NCV1117DT18RKG and NCV1117DT18T5G both extend the operating temperature range to -40°C to 125°C and include AEC-Q100 automotive qualification. These are suitable for applications requiring enhanced thermal performance or automotive-grade reliability.

Reduced Current Variants (800mA): LD1117DT18CTR, LD1117DT18TR, LM1117DT-1.8/NOPB, and LM1117DTX-1.8/NOPB are acceptable substitutes where system design accommodates 800mA maximum output current. These variants offer improved dropout voltage performance (1.2V @ 800mA) and lower quiescent current in some cases.

All recommended substitutes maintain TO-252-3 package compatibility, RoHS3 compliance, and integrated thermal and over-current protection. Selection should prioritize active product status and availability for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA-rated part as a direct replacement for the 1A AP1117D18G-13?

A: Yes, provided your application's maximum load current does not exceed 800mA. The 800mA variants (LD1117DT18CTR, LD1117DT18TR, LM1117DT-1.8/NOPB, LM1117DTX-1.8/NOPB) are pin-compatible and functionally equivalent at reduced current levels. Verify your circuit's actual current requirements before substitution.

Q: What is the difference between NCP1117DT18RKG and NCV1117DT18RKG?

A: NCV1117DT18RKG is the automotive-grade variant with AEC-Q100 qualification and extended operating temperature range (-40°C to 125°C). NCP1117DT18RKG operates from 0°C to 125°C. Both deliver 1A output current and are electrically equivalent except for temperature rating and automotive qualification.

Q: Are all substitute parts in the same TO-252-3 package?

A: Yes. All listed substitutes use the TO-252-3 (DPAK) surface mount package with identical pinout and footprint compatibility. No PCB layout modifications are required for mechanical substitution.

Q: Which substitute offers the best dropout voltage performance?

A: LD1117ADT18TR provides the lowest dropout voltage at 1.3V @ 1A. For 800mA operation, LD1117DT18TR and LM1117DT-1.8/NOPB both specify 1.2V dropout voltage.

Q: Can I substitute an onsemi part for a Diodes Incorporated part?

A: Yes. NCP1117DT18RKG and NCV1117DT18RKG from onsemi are functionally equivalent to the AP1117D18G-13 and maintain the same electrical specifications, package, and protection features. Verify availability and lead times with your supplier.

Q: What does MSL rating mean for these parts?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture during storage and handling. MSL 1 (unlimited shelf life) is superior to MSL 3 (168 hours). Most substitutes carry MSL 1 rating, ensuring longer shelf stability.

Q: Is the AP1117D18G-13 still available for purchase?

A: The AP1117D18G-13 is classified as obsolete. Active substitutes with current production status should be used for new designs and ongoing production requirements.

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