AP1117D50L-U Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP1117D50L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 5V output at 1A maximum current in a TO-252-3 (DPAK) surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The AP1117D50L-U belongs to the Power Management (PMIC) category and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Output Voltage (Fixed)	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 (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AP1117D50L-U is determined by the following critical parameters:

Fixed output voltage of 5V
Surface mount DPAK (TO-252-3) package compatibility
Positive output configuration with single regulator
Over current and over temperature protection
RoHS3 compliance and EAR99 classification

The substitute parts are grouped into two categories based on output current capability:

Category A: 1A Output Current (Direct Functional Equivalents)

NCP1117DT50G (onsemi, Last Time Buy status)
NCP1117DT50RKG (onsemi, Active)
NCV1117DT50RKG (onsemi, Active, Automotive grade AEC-Q100)

Category B: 800mA Output Current (Reduced Current Capability)

LD1117DT50CTR (STMicroelectronics, Active)
LD1117DT50TR (STMicroelectronics, Active)
LM1117DT-5.0/NOPB (Texas Instruments, Active)
LM1117DTX-5.0/NOPB (National Semiconductor, Active)
LM1117IDT-5.0/NOPB (Texas Instruments, Active)
LM1117IDTX-5.0/NOPB (Texas Instruments, Active)

Parameter Comparison

Part Number	Manufacturer	Output Current	Max Input Voltage	Dropout Voltage	Quiescent Current	PSRR	Operating Temperature	Product Status	Package
AP1117D50L-U	Diodes Incorporated	1A	18V	1.4V @ 1A	10 mA	60dB (180Hz)	0°C ~ 125°C	Obsolete	TO-252-3
NCP1117DT50RKG	onsemi	1A	20V	1.2V @ 800mA	10 mA	61dB (120Hz)	0°C ~ 125°C	Active	TO-252-3
NCV1117DT50RKG	onsemi	1A	20V	1.2V @ 800mA	10 mA	61dB (120Hz)	-40°C ~ 125°C	Active	TO-252-3
NCP1117DT50G	onsemi	1A	20V	1.2V @ 800mA	10 mA	61dB (120Hz)	0°C ~ 125°C	Last Time Buy	TO-252-3
LD1117DT50TR	STMicroelectronics	800mA	15V	1.2V @ 800mA	10 mA	75dB (120Hz)	0°C ~ 125°C	Active	TO-252-3
LD1117DT50CTR	STMicroelectronics	800mA	15V	1.3V @ 800mA	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	TO-252-3
LM1117DT-5.0/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active	TO-252-3
LM1117IDT-5.0/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	-40°C ~ 125°C	Active	TO-252-3
LM1117IDTX-5.0/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	-40°C ~ 125°C	Active	TO-252-3
LM1117DTX-5.0/NOPB	National Semiconductor	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active	TO-252-3

Engineering Selection Recommendations

Primary Substitutes (1A Output Current, Direct Replacement)

NCP1117DT50RKG and NCV1117DT50RKG from onsemi are the preferred direct substitutes. Both maintain 1A output current capability, matching the AP1117D50L-U specification. NCP1117DT50RKG is suitable for commercial temperature range applications (0°C ~ 125°C), while NCV1117DT50RKG extends the operating range to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. Both are in active production status with high inventory availability (35,300 and 17,300 units respectively).

Secondary Substitutes (800mA Output Current, Reduced Current Capability)

The LD1117DT50TR (STMicroelectronics) and LM1117 series (Texas Instruments, National Semiconductor) provide 800mA output current. These are suitable only for applications where the load current does not exceed 800mA. LD1117DT50TR offers the highest inventory (44,500 units) and improved PSRR performance (75dB vs. 60dB). LM1117IDTX-5.0/NOPB provides extended temperature range (-40°C ~ 125°C) with 19,818 units in stock.

All substitute parts maintain TO-252-3 package compatibility, RoHS3 compliance, and identical protection features (over current and over temperature). Input voltage ratings vary between 15V and 20V, all exceeding the AP1117D50L-U specification of 18V maximum.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA rated substitute in place of the 1A AP1117D50L-U?

A: Only if your application's maximum load current does not exceed 800mA. The LD1117 and LM1117 series are rated for 800mA maximum output current. Exceeding this limit will trigger over current protection. If your design requires the full 1A capability, use NCP1117DT50RKG or NCV1117DT50RKG.

Q: What is the difference between NCP1117DT50RKG and NCV1117DT50RKG?

A: Both are onsemi 1A regulators in TO-252-3 packages with identical electrical specifications. NCV1117DT50RKG is automotive-grade with AEC-Q100 qualification and extended operating temperature range (-40°C ~ 125°C). NCP1117DT50RKG is commercial-grade (0°C ~ 125°C). Select NCV1117DT50RKG for automotive or extended temperature applications.

Q: Are all substitutes pin-compatible with the AP1117D50L-U?

A: Yes. All listed substitutes use the TO-252-3 (DPAK) package with identical pin configuration: 2 leads plus tab. Physical and electrical pin compatibility is maintained across all substitutes.

Q: Why do some substitutes have lower maximum input voltage (15V vs. 18V)?

A: The LD1117 and LM1117 series specify 15V maximum input voltage, while the AP1117D50L-U and onsemi NCP/NCV1117 series specify 18V or 20V. If your design operates above 15V input, use NCP1117DT50RKG, NCV1117DT50RKG, or verify that your actual input voltage remains within the 15V limit for LD1117 and LM1117 parts.

Q: What is the significance of the dropout voltage difference?

A: The AP1117D50L-U specifies 1.4V dropout at 1A, while most substitutes specify 1.2V at 800mA. Lower dropout voltage improves efficiency and allows operation with lower input voltages. This is advantageous for battery-powered applications. Verify your minimum input voltage requirement against the dropout specification of your selected substitute.

Q: Which substitute has the best PSRR performance?

A: The LD1117DT50TR and LM1117 series offer 75dB PSRR at 120Hz, compared to 60dB at 180Hz for the AP1117D50L-U. Higher PSRR provides better rejection of input voltage ripple and noise, beneficial for noise-sensitive analog circuits.

Q: Can I use LM1117 parts in new production designs?

A: Yes. All LM1117 variants listed are in active production status. LM1117IDTX-5.0/NOPB and LM1117IDT-5.0/NOPB from Texas Instruments are recommended for new designs, with 19,818 and 1,921 units in stock respectively.

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