AP1117D33L-13 Equivalent & Substitute Parts

Part Overview

The AP1117D33L-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 3.3V output at 1A maximum current in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The AP1117D33L-13 serves as a positive fixed output regulator with integrated over-current and over-temperature protection, suitable for embedded systems, consumer electronics, and industrial applications requiring stable 3.3V power delivery.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
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
Package Type	TO-252-3 (DPAK)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AP1117D33L-13 is determined by the following critical parameters:

Output Voltage: Must be fixed at 3.3V
Output Configuration: Must be positive fixed output
Package Type: Must be TO-252-3 (DPAK) surface mount
Protection Features: Must include over-current and over-temperature protection
Output Current Capability: Minimum 1A (or 800mA for current-limited variants)
Maximum Input Voltage: Minimum 15V (substitute parts rated 15V or higher are acceptable)
Compliance: ROHS3 compliant, REACH unaffected

Substitute parts are grouped into two categories based on output current rating: full 1A capability (LD1117ADT33TR, NCP1117DT33T5G, NCP1117DT33RKG, NCV1117DT33T5G) and 800mA variants (LD1117DT33CTR, LD1117DT33TR, LM1117DT-3.3/NOPB, LM1117DTX-3.3/NOPB, LM1117IDT-3.3/NOPB, LM1117IDTX-3.3/NOPB). All substitute parts maintain identical output voltage, package footprint, and protection feature sets.

Parameter Comparison

Part Number	Manufacturer	Output Current	Max Input Voltage	Dropout @ Rated Current	Quiescent Current	PSRR (120Hz)	Operating Temperature	Product Status
AP1117D33L-13	Diodes Incorporated	1A	18V	1.4V @ 1A	10 mA	60dB (180Hz)	0°C ~ 125°C	Obsolete
LD1117ADT33TR	STMicroelectronics	1A	15V	1.3V @ 1A	10 mA	75dB	0°C ~ 125°C	Active
LD1117DT33CTR	STMicroelectronics	800mA	15V	1.3V @ 800mA	10 mA	75dB	-40°C ~ 125°C	Active
LD1117DT33TR	STMicroelectronics	800mA	15V	1.2V @ 800mA	10 mA	75dB	0°C ~ 125°C	Active
LM1117DT-3.3/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB	0°C ~ 125°C	Active
LM1117DTX-3.3/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB	0°C ~ 125°C	Active
LM1117IDT-3.3/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB	-40°C ~ 125°C	Active
LM1117IDTX-3.3/NOPB	Texas Instruments	800mA	15V	1.2V @ 800mA	5 mA	75dB	-40°C ~ 125°C	Active
NCP1117DT33RKG	onsemi	1A	20V	1.2V @ 800mA	10 mA	64dB	0°C ~ 125°C	Active
NCP1117DT33T5G	onsemi	1A	20V	1.2V @ 800mA	10 mA	64dB	0°C ~ 125°C	Active
NCV1117DT33T5G	onsemi	1A	20V	1.2V @ 800mA	10 mA	64dB	-40°C ~ 125°C (Automotive)	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, making them suitable replacements for the obsolete AP1117D33L-13.

Full 1A Output Current Capability: LD1117ADT33TR, NCP1117DT33T5G, NCP1117DT33RKG, and NCV1117DT33T5G maintain the original 1A output current specification. These parts are direct functional equivalents when full 1A capacity is required. NCV1117DT33T5G includes automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C), suitable for automotive and industrial applications.

800mA Output Current Variants: LD1117DT33CTR, LD1117DT33TR, LM1117DT-3.3/NOPB, LM1117DTX-3.3/NOPB, LM1117IDT-3.3/NOPB, and LM1117IDTX-3.3/NOPB provide 800mA output current. These are suitable for applications where the load current does not exceed 800mA. Texas Instruments variants (LM1117 series) feature lower quiescent current (5 mA vs. 10 mA), reducing standby power consumption.

Temperature Range Considerations: Parts rated -40°C ~ 125°C (LD1117DT33CTR, LM1117IDT-3.3/NOPB, LM1117IDTX-3.3/NOPB, NCV1117DT33T5G) are suitable for extended operating environments. Standard 0°C ~ 125°C variants are appropriate for consumer and commercial applications.

Input Voltage Margin: NCP1117 and NCV1117 variants support 20V maximum input, providing additional headroom compared to the original 18V specification and 15V-rated STMicroelectronics and Texas Instruments alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use an 800mA variant as a direct replacement for the 1A AP1117D33L-13?

A: Yes, if your application load current does not exceed 800mA. The 800mA variants (LD1117DT33CTR, LD1117DT33TR, LM1117 series) are pin-compatible and functionally equivalent at reduced current ratings. If your design requires full 1A capability, use LD1117ADT33TR, NCP1117DT33T5G, NCP1117DT33RKG, or NCV1117DT33T5G.

Q: Are all substitute parts pin-compatible with the AP1117D33L-13?

A: Yes. All substitute parts use the TO-252-3 (DPAK) package with identical pin configuration: Input, Ground, and Output (with tab connection to ground).

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

A: Both are Texas Instruments LM1117-3.3 series regulators with identical electrical specifications. The primary difference is packaging: DT indicates Tube packaging, while DTX indicates Cut Tape (CT) & Digi-Reel® packaging. Electrical performance is identical.

Q: Which substitute part has the lowest quiescent current?

A: Texas Instruments LM1117 series variants (LM1117DT-3.3/NOPB, LM1117DTX-3.3/NOPB, LM1117IDT-3.3/NOPB, LM1117IDTX-3.3/NOPB) feature 5 mA quiescent current, compared to 10 mA for other substitutes. This reduces standby power consumption by 50%.

Q: Is NCV1117DT33T5G suitable for automotive applications?

A: Yes. NCV1117DT33T5G is automotive-grade with AEC-Q100 qualification, extended temperature range (-40°C ~ 125°C), and 1A output current capability. It is the recommended choice for automotive and harsh industrial environments.

Q: What is the maximum input voltage I can apply to each substitute part?

A: STMicroelectronics (LD1117) and Texas Instruments (LM1117) variants support 15V maximum input. onsemi variants (NCP1117, NCV1117) support 20V maximum input. The original AP1117D33L-13 supports 18V, so all substitutes provide adequate or superior input voltage margin.

Q: Can I interchange NCP1117DT33T5G and NCP1117DT33RKG?

A: Yes. Both are onsemi NCP1117 3.3V 1A regulators in DPAK packaging with identical electrical specifications. The primary difference is packaging: RKG indicates Cut Tape & Digi-Reel®, while T5G also indicates Cut Tape & Digi-Reel® with different inventory and availability.

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