AP1086D33L-13 Equivalent & Substitute Parts

Part Overview

The AP1086D33L-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 3.3V output at 1.5A in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part provides over-current and over-temperature protection suitable for general-purpose power management applications requiring positive fixed voltage regulation.

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
Package Type	TO-252-3 (DPAK)
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP1086D33L-13 are selected based on the following critical parameters that determine functional equivalence:

Fixed output voltage of 3.3V
Surface mount DPAK (TO-252-3) package compatibility
Over-current and over-temperature protection
ROHS3 compliance and REACH unaffected status
Positive fixed output configuration with single regulator

The two substitute parts identified meet these core requirements while maintaining electrical and mechanical compatibility. Differences in maximum input voltage, dropout voltage, and operating temperature ranges are noted but do not prevent substitution in applications within the specified operating conditions of the original part.

Parameter Comparison

Parameter	AP1086D33L-13 (Diodes)	LD1086DT33TR (STMicroelectronics)	LD1117ADT33TR (STMicroelectronics)
Manufacturer	Diodes Incorporated	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active
Output Voltage	3.3V	3.3V	3.3V
Output Current	1.5A	1.5A	1.0A
Input Voltage (Max)	12V	30V	15V
Voltage Dropout (Max)	1.4V @ 1.5A	1.5V @ 1.5A	1.3V @ 1A
Quiescent Current	10 mA	10 mA	10 mA
PSRR (120Hz)	60dB	79dB	75dB
Operating Temperature	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
Package	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both substitute parts are manufactured by STMicroelectronics and carry active product status, ensuring long-term availability and supply chain continuity compared to the obsolete AP1086D33L-13.

LD1086DT33TR provides the closest electrical match to the original part, maintaining 1.5A output current capability and identical quiescent current specifications. This part is recommended for direct replacement in applications requiring the full 1.5A output current rating. The higher maximum input voltage (30V) and extended operating temperature range (-40°C ~ 125°C) provide additional design margin.

LD1117ADT33TR is suitable for applications where output current requirements do not exceed 1.0A. This part offers improved PSRR performance (75dB) and lower dropout voltage at its rated current (1.3V @ 1A). The lower maximum input voltage (15V) remains compatible with the original part's 12V maximum specification.

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical package geometry, enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LD1086DT33TR directly replace AP1086D33L-13 in all applications?

A: Yes, LD1086DT33TR is electrically and mechanically compatible for direct replacement. Both parts deliver 1.5A at 3.3V in identical TO-252-3 packages with matching protection features and quiescent current specifications.

Q: What is the key difference between LD1086DT33TR and LD1117ADT33TR?

A: The primary difference is output current rating. LD1086DT33TR supports 1.5A, matching the original part's capability. LD1117ADT33TR is rated for 1.0A maximum output current. Selection depends on the application's current requirements.

Q: Are package dimensions identical across all three parts?

A: Yes. All three parts use the TO-252-3 (DPAK) package with identical pin configuration and mechanical footprint, enabling direct PCB substitution without layout changes.

Q: Do the substitute parts meet the same compliance standards as AP1086D33L-13?

A: Yes. Both LD1086DT33TR and LD1117ADT33TR are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original part's compliance profile.

Q: What is the impact of higher maximum input voltage on LD1086DT33TR?

A: The 30V maximum input rating on LD1086DT33TR provides additional design margin compared to the original part's 12V specification. This does not affect compatibility in applications operating within the original 12V limit.

Q: Can LD1117ADT33TR be used in applications requiring 1.5A output?

A: No. LD1117ADT33TR is rated for maximum 1.0A output current. Use LD1086DT33TR for applications requiring the full 1.5A capability.

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