AP1084T50L-U Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP1084T50L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver fixed 5V output at 5A current capacity in a TO-220-3 package. This device functions as a positive fixed output regulator with integrated over-current and over-temperature protection. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

AP1084T50L-U

Diodes IncorporatedIn Stock: 5054AP1084T50L-U Datasheet

Current PartRFQ

LT1084CT-5#PBF

Analog Devices Inc.In Stock: 4056LT1084CT-5#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1084T50L-U are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is based on the following key parameters:

• Fixed 5V output voltage matching the original specification
• Minimum 5A output current capability
• TO-220-3 package for direct pin-compatible replacement
• Through-hole mounting type
• Operating temperature range of 0°C to 125°C or wider
• Positive output configuration
• RoHS3 compliance for regulatory alignment

The LT1084CT-5#PBF from Analog Devices Inc. meets all these criteria and is classified as an active product, providing long-term availability and support compared to the obsolete AP1084T50L-U.

Parameter Comparison

Engineering Selection Recommendations

The LT1084CT-5#PBF is a direct functional equivalent for the AP1084T50L-U based on the following engineering criteria:

• Both devices deliver identical 5V fixed output at 5A current capacity with matching quiescent current specifications
• Pin-compatible TO-220-3 package enables direct board-level replacement without layout modifications
• Both operate across the 0°C to 125°C temperature range, meeting thermal requirements
• Both achieve ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements
• The LT1084CT-5#PBF maintains active product status with established supply chain availability, addressing the obsolescence of the AP1084T50L-U
• Maximum input voltage of 20V on the LT1084CT-5#PBF exceeds the 12V specification of the original part, providing enhanced design margin
• Dropout voltage differential of 0.1V (1.5V vs 1.4V) remains within acceptable engineering tolerance for 5A linear regulator applications

Frequently Asked Questions (FAQ)

Q: Can the LT1084CT-5#PBF replace the AP1084T50L-U in existing designs?

A: Yes. Both devices are pin-compatible in TO-220-3 packages and deliver identical 5V/5A specifications. Direct substitution is possible without circuit modifications.

Q: What is the difference in maximum input voltage between these parts?

A: The AP1084T50L-U specifies 12V maximum input, while the LT1084CT-5#PBF specifies 20V maximum input. The substitute part accommodates higher input voltages, providing additional design flexibility.

Q: Are there differences in protection features?

A: The AP1084T50L-U includes both over-current and over-temperature protection. The LT1084CT-5#PBF includes over-temperature protection. Over-current protection differences should be evaluated against specific application requirements.

Q: Does the LT1084CT-5#PBF meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.

Q: Why is the AP1084T50L-U classified as obsolete?

A: Obsolescence reflects manufacturer discontinuation. The LT1084CT-5#PBF maintains active status with ongoing manufacturing support and supply availability.

Q: Are there thermal or performance differences?

A: Operating temperature ranges are identical (0°C to 125°C). Dropout voltage differs by 0.1V at 5A, which is negligible for most linear regulator applications. The LT1084CT-5#PBF provides specified PSRR of 68dB at 120Hz.