AP1086K33L-13 Equivalent & Substitute Parts

Part Overview

The AP1086K33L-13 is a linear voltage regulator IC from Diodes Incorporated, designed to deliver a fixed 3.3V output at 1.5A in a TO-263 surface mount 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 power management applications requiring stable 3.3V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	12V
Voltage Dropout (Max)	1.4V @ 1.5A
Quiescent Current	10 mA
PSRR	60dB (120Hz)
Package Type	TO-263-3 / D2PAK (2 Leads + Tab)
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AP1086K33L-13 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 1.5A minimum
Surface mount D2PAK (TO-263) package compatibility
Over-current and over-temperature protection
RoHS3 compliance and REACH unaffected status
Operating temperature range support (minimum 0°C ~ 125°C)

The LD1086D2T33TR from STMicroelectronics meets all substitution criteria. Both devices share identical output voltage, current rating, package form factor, and protection features. The substitute part maintains full electrical and mechanical compatibility while offering extended input voltage tolerance and improved PSRR performance.

Parameter Comparison

Parameter	AP1086K33L-13 (Diodes)	LD1086D2T33TR (STMicroelectronics)	Compatibility
Output Voltage (Fixed)	3.3V	3.3V	Identical
Output Current	1.5A	1.5A	Identical
Input Voltage (Max)	12V	30V	Substitute exceeds specification
Voltage Dropout (Max)	1.4V @ 1.5A	1.5V @ 1.5A	Within acceptable margin
Quiescent Current	10 mA	10 mA	Identical
PSRR	60dB (120Hz)	79dB (120Hz)	Substitute exceeds specification
Package Type	TO-263-3 / D2PAK	TO-263-3 / D2PAK	Identical
Operating Temperature	0°C ~ 125°C	-40°C ~ 125°C	Substitute exceeds specification
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Identical
Product Status	Obsolete	Active	Substitute actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

The LD1086D2T33TR is the direct functional equivalent for the obsolete AP1086K33L-13. Selection is based on the following engineering criteria:

Electrical compatibility is confirmed through matching output voltage (3.3V), output current (1.5A), package configuration (D2PAK), and protection architecture. The substitute part maintains all required safety features and regulatory compliance.

Product status favors the LD1086D2T33TR, which is actively manufactured by STMicroelectronics with substantial inventory availability (61,307 pcs), ensuring supply chain continuity compared to the obsolete Diodes part.

Compliance verification confirms both devices are ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications, supporting direct substitution in regulated applications.

Performance characteristics of the substitute part exceed the original specification in input voltage tolerance (30V vs. 12V), PSRR performance (79dB vs. 60dB), and operating temperature range (-40°C to 125°C vs. 0°C to 125°C), providing enhanced design margin without compromising compatibility.

Frequently Asked Questions (FAQ)

Q: Can the LD1086D2T33TR directly replace the AP1086K33L-13 in existing designs?

A: Yes. Both devices share identical output voltage (3.3V), output current (1.5A), D2PAK package configuration, and protection features. No circuit modifications are required for direct substitution.

Q: What is the significance of the higher input voltage rating on the LD1086D2T33TR?

A: The LD1086D2T33TR accepts input voltages up to 30V compared to 12V on the AP1086K33L-13. This expanded rating provides additional design flexibility and protection against transient overvoltage conditions. If your application uses input voltages below 12V, both parts perform identically.

Q: Are there any thermal or performance differences between these parts?

A: The LD1086D2T33TR exhibits superior PSRR performance (79dB vs. 60dB at 120Hz), resulting in lower output noise. Voltage dropout is marginally higher (1.5V vs. 1.4V at 1.5A), a difference of 0.1V that is negligible in most 3.3V rail applications. Both devices operate within the same thermal envelope in the D2PAK package.

Q: Does the extended operating temperature range of the LD1086D2T33TR affect compatibility?

A: No. The LD1086D2T33TR supports -40°C to 125°C operation, which encompasses the original part's 0°C to 125°C range. This extended capability provides additional margin for applications operating at lower ambient temperatures without introducing any compatibility issues.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the AP1086K33L-13 and LD1086D2T33TR are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in regulated markets.

Q: What is the package compatibility between these parts?

A: Both devices use the TO-263-3 package, also designated as D2PAK with 2 leads plus tab. Pin configuration and PCB footprint are identical, enabling direct board-level substitution without layout modifications.

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