AP1117D33L-U Linear Voltage Regulator 3.3V 1A Equivalent & Substitute Parts

Part Overview

The AP1117D33L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 3.3V output at 1A maximum current. This device features positive output configuration with integrated over-current and over-temperature protection. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal characteristics while supporting the same TO-252-3 (DPAK) surface mount package.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	3.3V	V
Output Current	1A	A
Input Voltage (Maximum)	18V	V
Dropout Voltage @ 1A	1.4V	V
Quiescent Current	10 mA	mA
PSRR @ 180Hz	60dB	dB
Operating Temperature Range	0°C to 125°C	°C
Package Type	TO-252-3 (DPAK)	—
Protection Features	Over Current, Over Temperature	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Electrical Compatibility Requirements:

Fixed output voltage of 3.3V
Output current rating of 800mA minimum (AP1117D33L-U rated at 1A)
Maximum input voltage of 15V or greater
Dropout voltage at rated current of 1.4V or less
Quiescent current of 10mA or less
Over-current and over-temperature protection

Mechanical Compatibility Requirements:

TO-252-3 (DPAK) surface mount package
2 leads plus tab configuration

Compliance Requirements:

ROHS3 compliant
Active or obsolete product status acceptable

All substitute parts listed meet these criteria and are electrically and mechanically interchangeable with the AP1117D33L-U in applications where the specified parameters are within design tolerances.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Operating Temp	Product Status
AP1117D33L-U	Diodes Incorporated	3.3V	1A	18V	1.4V @ 1A	10 mA	60dB (180Hz)	0°C to 125°C	Obsolete
LD1117ADT33TR	STMicroelectronics	3.3V	1A	15V	1.3V @ 1A	10 mA	75dB (120Hz)	0°C to 125°C	Active
LD1117DT33CTR	STMicroelectronics	3.3V	800mA	15V	1.3V @ 800mA	10 mA	75dB (120Hz)	-40°C to 125°C	Active
LD1117DT33TR	STMicroelectronics	3.3V	800mA	15V	1.2V @ 800mA	10 mA	75dB (120Hz)	0°C to 125°C	Active
LM1117DT-3.3/NOPB	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C to 125°C	Active
LM1117DTX-3.3/NOPB	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C to 125°C	Active
LM1117IDT-3.3/NOPB	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	-40°C to 125°C	Active
LM1117IDTX-3.3/NOPB	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	5 mA	75dB (120Hz)	-40°C to 125°C	Active
NCP1117DT33RKG	onsemi	3.3V	1A	20V	1.2V @ 800mA	10 mA	64dB (120Hz)	0°C to 125°C	Active
NCP1117DT33T5G	onsemi	3.3V	1A	20V	1.2V @ 800mA	10 mA	64dB (120Hz)	0°C to 125°C	Active
NCV1117DT33T5G	onsemi	3.3V	1A	20V	1.2V @ 800mA	10 mA	64dB (120Hz)	-40°C to 125°C	Active

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

LD1117ADT33TR and NCP1117DT33T5G are direct replacements for the AP1117D33L-U. Both devices support 1A output current, maintain 3.3V fixed output, and provide equivalent protection features. LD1117ADT33TR is manufactured by STMicroelectronics with active product status and improved PSRR performance (75dB vs 60dB). NCP1117DT33T5G is manufactured by onsemi with higher maximum input voltage rating (20V vs 18V) and active product status.

Secondary Substitutes (Reduced Current Rating):

LD1117DT33CTR, LD1117DT33TR, LM1117DT-3.3/NOPB, LM1117DTX-3.3/NOPB, LM1117IDT-3.3/NOPB, and LM1117IDTX-3.3/NOPB are suitable for applications where output current does not exceed 800mA. These parts maintain 3.3V fixed output and TO-252-3 package compatibility. Texas Instruments LM1117 variants feature lower quiescent current (5mA vs 10mA) and extended temperature range options (-40°C to 125°C). STMicroelectronics LD1117 variants offer improved dropout voltage performance.

Automotive Grade Option:

NCV1117DT33T5G is the automotive-qualified variant (AEC-Q100) with extended operating temperature range (-40°C to 125°C), suitable for automotive and harsh environment applications.

Compliance Status:

All substitute parts are ROHS3 compliant and REACH unaffected, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA rated part as a direct replacement for the AP1117D33L-U in a 1A application?

A: No. The AP1117D33L-U is rated for 1A continuous output current. Substitutes with 800mA ratings (LD1117DT33CTR, LD1117DT33TR, LM1117 series) are suitable only for applications requiring 800mA or less. Exceeding the rated current will cause thermal shutdown and circuit malfunction.

Q: What is the difference between LM1117DT-3.3/NOPB and LM1117DTX-3.3/NOPB?

A: Both parts are electrically identical with 800mA output current and 3.3V fixed output. The primary difference is packaging: LM1117DT-3.3/NOPB is supplied in Tube packaging, while LM1117DTX-3.3/NOPB is supplied in Cut Tape (CT) & Digi-Reel format. Select based on your procurement and assembly requirements.

Q: Are STMicroelectronics LD1117 and Texas Instruments LM1117 parts pin-compatible?

A: Yes. Both device families use the TO-252-3 (DPAK) package with identical pin configuration: 2 leads plus tab. They are mechanically and electrically interchangeable within their rated specifications.

Q: What is the advantage of NCP1117DT33T5G over LD1117ADT33TR?

A: NCP1117DT33T5G supports higher maximum input voltage (20V vs 15V) and maintains 1A output current rating. LD1117ADT33TR offers superior PSRR performance (75dB vs 64dB). Select NCP1117DT33T5G for higher input voltage applications; select LD1117ADT33TR for noise-sensitive applications.

Q: Can I use NCV1117DT33T5G in non-automotive applications?

A: Yes. NCV1117DT33T5G is automotive-qualified but functionally suitable for any application within its electrical specifications. It provides extended temperature range (-40°C to 125°C) and AEC-Q100 qualification, making it appropriate for industrial and harsh environment use.

Q: What does the dropout voltage specification mean for my design?

A: Dropout voltage is the minimum difference between input and output voltage required for the regulator to maintain regulation. At 1A output current, the AP1117D33L-U requires 1.4V minimum headroom (input voltage must be at least 4.7V for 3.3V output). Substitute parts with lower dropout voltage (1.2V or 1.3V) provide better efficiency and allow operation with lower input voltages.

Q: Are all substitute parts available in the same packaging options?

A: No. Packaging availability varies by manufacturer and part number. LD1117 series parts are available in Cut Tape & Digi-Reel format. LM1117 series offers both Tube and Cut Tape options. NCP1117 and NCV1117 series are available in Cut Tape & Digi-Reel format. Verify packaging availability with your supplier before finalizing part selection.

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