AP1117IE33G-13 Equivalent & Substitute Parts

Part Overview

The AP1117IE33G-13 is a linear voltage regulator IC from Diodes Incorporated, designed to deliver a fixed 3.3V output at 1A maximum current in a surface-mount SOT-223-3 package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for low-power embedded systems and industrial applications requiring stable 3.3V rails.

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
Package Type	SOT-223-3
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP1117IE33G-13 are qualified based on the following critical parameters:

Fixed output voltage of 3.3V
Maximum output current of 1A
Surface-mount SOT-223-3 package compatibility
Operating temperature range of -40°C to 125°C (or subset thereof)
Positive fixed output configuration
Single regulator topology

Two substitute parts meet these core electrical and mechanical requirements: the AZ1117H-3.3TRE1 (Diodes Incorporated) and the NCP1117LPST33T3G (onsemi). Both devices maintain identical output specifications and package form factor, enabling direct functional replacement in existing designs.

Parameter Comparison

Parameter	AP1117IE33G-13	AZ1117H-3.3TRE1	NCP1117LPST33T3G
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi
Output Voltage	3.3V	3.3V	3.3V
Output Current	1A	1A	1A
Input Voltage (Max)	18V	15V	18V
Dropout Voltage (Max)	1.4V @ 1A	1.25V @ 1A	1.4V @ 1A
Quiescent Current	10 mA	10 mA	700 µA
PSRR	60dB (180Hz)	75dB (120Hz)	60dB (120Hz)
Package	SOT-223-3	SOT-223-3	SOT-223
Operating Temperature	-40°C to 125°C	-40°C to 125°C	0°C to 125°C
Product Status	Obsolete	Active	Active
Protection Features	Over Current, Over Temperature	Thermal Shutdown	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Both substitute parts are active products with full RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current manufacturing standards.

AZ1117H-3.3TRE1 is suitable for applications where input voltage does not exceed 15V and where lower dropout voltage (1.25V vs. 1.4V) provides marginal efficiency gains. This part maintains identical quiescent current and operating temperature range as the original AP1117IE33G-13. Moisture sensitivity level MSL-3 requires controlled storage conditions (168-hour limit after bag opening).

NCP1117LPST33T3G is recommended for applications requiring the full 18V input voltage range and lowest quiescent current (700 µA vs. 10 mA), resulting in reduced standby power consumption. This part matches the original dropout voltage specification and provides identical protection features. Operating temperature range is limited to 0°C to 125°C, excluding sub-zero operation. MSL-1 rating permits unlimited shelf life without moisture control.

Selection between substitutes depends on input voltage requirements, operating temperature range, and power consumption constraints specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the AZ1117H-3.3TRE1 replace the AP1117IE33G-13 in all applications?

A: The AZ1117H-3.3TRE1 is functionally compatible for applications where input voltage remains below 15V. If your design requires operation at input voltages between 15V and 18V, the NCP1117LPST33T3G is the appropriate substitute. Both parts share identical output voltage, current rating, and package form factor.

Q: What is the difference in quiescent current between these parts?

A: The AP1117IE33G-13 and AZ1117H-3.3TRE1 both draw 10 mA quiescent current. The NCP1117LPST33T3G draws 700 µA, approximately 14 times lower. This difference is significant only in battery-powered or always-on standby applications where quiescent current dominates total power consumption.

Q: Are there package compatibility concerns?

A: All three parts use SOT-223-3 or SOT-223 packages with identical pinout and footprint. Direct PCB substitution is possible without layout modifications.

Q: What does MSL-3 (168 Hours) mean for the AZ1117H-3.3TRE1?

A: MSL-3 indicates the part must be used within 168 hours (7 days) of bag opening under controlled humidity conditions. Exceeding this window requires baking per IPC-A-2.1 specifications before reflow soldering. The AP1117IE33G-13 and NCP1117LPST33T3G carry MSL-1 (unlimited shelf life), eliminating this constraint.

Q: Which part should I select for new designs?

A: For new designs, either active substitute is acceptable. Choose NCP1117LPST33T3G if the full 18V input range or low quiescent current is required. Choose AZ1117H-3.3TRE1 if input voltage is limited to 15V and lower dropout voltage provides system benefits. Both parts are actively manufactured with established supply chains.

Q: Is the operating temperature range difference significant?

A: The NCP1117LPST33T3G operates from 0°C to 125°C, excluding temperatures below 0°C. If your application requires operation at -40°C to 0°C, the AZ1117H-3.3TRE1 or original AP1117IE33G-13 specification is necessary. Most commercial and industrial applications operate within the 0°C to 125°C range.

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