AP1084T33L-U Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP1084T33L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 3.3V output at 5A maximum current in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The regulator features integrated over-current and over-temperature protection, suitable for applications requiring stable 3.3V power delivery from input sources up to 12V.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP1084T33L-U
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	5A
Input Voltage (Max)	12V
Dropout Voltage (Max)	1.4V @ 5A
Quiescent Current	10 mA
Protection Features	Over Current, Over Temperature
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP1084T33L-U are evaluated based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Fixed output voltage of 3.3V
Output current capability (minimum 5A for direct replacement)
TO-220-3 package configuration
Through-hole mounting type
Operating temperature range of 0°C ~ 125°C
Over-temperature protection feature
RoHS3 compliance

Secondary Compatibility Factors:

Input voltage rating (minimum 12V tolerance)
Dropout voltage performance at rated current
Quiescent current specifications
Product status and availability

Two substitute parts meet the primary criteria for direct replacement: the LT1084CT-3.3#PBF (Analog Devices Inc.) and the LD1117AV33 (STMicroelectronics). The LT1084CT-3.3#PBF provides the closest electrical match with 5A output capability. The LD1117AV33 offers reduced output current (1A) and is suitable only for applications with lower current requirements.

Parameter Comparison

Parameter	AP1084T33L-U (Main)	LT1084CT-3.3#PBF (Substitute)	LD1117AV33 (Substitute)
Manufacturer	Diodes Incorporated	Analog Devices Inc.	STMicroelectronics
Output Voltage (Fixed)	3.3V	3.3V	3.3V
Output Current	5A	5A	1A
Input Voltage (Max)	12V	20V	15V
Dropout Voltage (Max)	1.4V @ 5A	1.5V @ 5A	1.3V @ 1A
Quiescent Current	10 mA	10 mA	10 mA
Protection Features	Over Current, Over Temperature	Over Temperature	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Package / Case	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LT1084CT-3.3#PBF (Primary Substitute): The LT1084CT-3.3#PBF from Analog Devices Inc. is the recommended direct replacement for the AP1084T33L-U. This part maintains identical 5A output current capability, matching package configuration (TO-220-3), and equivalent operating temperature range. The device carries Active product status, ensuring long-term availability and supply chain continuity. All regulatory compliance requirements (ROHS3, REACH Unaffected, EAR99) are met. The higher input voltage rating (20V vs. 12V) provides additional design margin. Over-temperature protection is included; note that over-current protection is not specified for this device.

LD1117AV33 (Secondary Substitute): The LD1117AV33 from STMicroelectronics is suitable only for applications where output current requirements do not exceed 1A. While this part shares the same 3.3V fixed output voltage, TO-220-3 package, and operating temperature range, the reduced current capability (1A vs. 5A) restricts its use to lower-power applications. Product status is Obsolete. This substitute is not appropriate for designs requiring the full 5A output capability of the original AP1084T33L-U.

Frequently Asked Questions (FAQ)

Q: Can the LT1084CT-3.3#PBF be used as a direct replacement for the AP1084T33L-U?

A: Yes. Both devices provide 3.3V fixed output at 5A maximum current in TO-220-3 packages with identical operating temperature ranges (0°C ~ 125°C). Electrical performance is equivalent for most applications. The LT1084CT-3.3#PBF has Active product status, ensuring availability.

Q: What is the key difference between the LT1084CT-3.3#PBF and LD1117AV33?

A: The primary difference is output current capability. The LT1084CT-3.3#PBF delivers 5A, matching the original AP1084T33L-U specification. The LD1117AV33 is limited to 1A output current and is suitable only for lower-power applications.

Q: Are all substitute parts in the same package?

A: Yes. Both substitute parts use the TO-220-3 package with through-hole mounting, identical to the AP1084T33L-U. PCB layout and thermal management considerations remain consistent.

Q: Do the substitute parts meet RoHS compliance requirements?

A: Yes. Both the LT1084CT-3.3#PBF and LD1117AV33 are ROHS3 Compliant, matching the compliance status of the original AP1084T33L-U.

Q: Why is the AP1084T33L-U listed as Obsolete?

A: Obsolete status indicates the part is no longer manufactured by Diodes Incorporated. Substitute parts with Active status (such as the LT1084CT-3.3#PBF) provide equivalent functionality with assured long-term supply availability.

Q: What protection features should I verify when selecting a substitute?

A: The original AP1084T33L-U includes both over-current and over-temperature protection. The LT1084CT-3.3#PBF includes over-temperature protection. The LD1117AV33 includes both over-current and over-temperature protection. Verify that the selected substitute meets your application's protection requirements.

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