AP1084TL-U Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP1084TL-U is a linear voltage regulator IC from Diodes Incorporated, classified as a positive adjustable output regulator with 5A output capacity in TO-220-3 package. This component is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers adjustable output voltage from 1.25V to 10.6V with a maximum input voltage of 12V, suitable for applications requiring regulated power in compact form factors.

Substiute Parts

AP1084TL-U

Diodes IncorporatedIn Stock: 1161AP1084TL-U Datasheet

Current PartRFQ

AP1084TG-U

Diodes IncorporatedIn Stock: 1204AP1084TG-U Datasheet

Parametric EquivalentRFQ

LT1084CT#PBF

Analog Devices Inc.In Stock: 2486LT1084CT#PBF Datasheet

DirectRFQ

LD1084V

STMicroelectronicsIn Stock: 3987LD1084V Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1084TL-U are classified based on strict electrical and mechanical parameter alignment:

Parametric Equivalent (AP1084TG-U): Identical electrical specifications across all critical parameters including 5A output current, 1.25V to 10.6V adjustable output range, 1.4V dropout voltage, and TO-220-3 package. Differs only in product status (Active vs. Discontinued) and manufacturer batch designation.

Direct Manufacturer Equivalent (LT1084CT#PBF): Meets core functional requirements with 5A output current and TO-220-3 package. Extends input voltage capability to 30V and output voltage range to 28.5V, with marginally higher dropout voltage (1.5V @ 5A). Adds PSRR specification (75dB @ 120Hz) not present in AP1084TL-U. Suitable for designs requiring higher input voltage tolerance.

MFR Recommended Substitute (LD1084V): Meets all critical electrical parameters with 5A output current, 1.25V to 28.5V adjustable output range, and TO-220-3 package. Extends input voltage to 30V and operating temperature range to -40°C ~ 125°C. Adds short circuit protection and PSRR specification (72dB @ 120Hz). Represents the most comprehensive feature set among substitutes.

Key Parameters Determining Substitution:

• Output current capacity: 5A (mandatory)
• Output type: Adjustable (mandatory)
• Package: TO-220-3 (mandatory for mechanical compatibility)
• Output voltage range: Minimum 1.25V lower bound (mandatory)
• Input voltage tolerance: 12V minimum (mandatory)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Specifications): Select AP1084TG-U. This part maintains identical electrical and thermal characteristics to the AP1084TL-U while offering active product status and current availability. No design modifications required.

For Extended Input Voltage Applications: Select LT1084CT#PBF or LD1084V. Both parts extend maximum input voltage from 12V to 30V, accommodating higher supply rail designs. LT1084CT#PBF provides PSRR specification for noise-sensitive applications. LD1084V extends operating temperature range to -40°C and includes short circuit protection.

For Widest Operating Temperature Range: Select LD1084V. This part supports -40°C to 125°C operating range compared to 0°C to 125°C for other options, suitable for industrial and automotive environments.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original AP1084TL-U regulatory requirements. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can AP1084TG-U be used as a direct replacement for AP1084TL-U? A: Yes. AP1084TG-U is a parametric equivalent with identical electrical specifications, output current (5A), voltage ranges (1.25V to 10.6V), dropout voltage (1.4V @ 5A), and TO-220-3 package. No circuit modifications are required.

Q: What is the primary difference between LT1084CT#PBF and LD1084V? A: LT1084CT#PBF is manufactured by Analog Devices Inc. with specified PSRR of 75dB at 120Hz. LD1084V is manufactured by STMicroelectronics with PSRR of 72dB at 120Hz, extended operating temperature range (-40°C to 125°C), and short circuit protection. Both support 30V maximum input voltage.

Q: Are all substitute parts available in the same TO-220-3 package? A: Yes. All substitute parts use TO-220-3 package, ensuring mechanical and thermal compatibility with existing PCB layouts and heatsinking solutions.

Q: Can I use LT1084CT#PBF in a design limited to 12V input? A: Yes. LT1084CT#PBF operates at 12V input without issue. The 30V maximum input rating provides design margin and flexibility for future applications without requiring component changes.

Q: Which substitute part is recommended for industrial temperature environments? A: LD1084V supports -40°C to 125°C operating temperature range, making it suitable for industrial applications. AP1084TG-U, LT1084CT#PBF, and the original AP1084TL-U are limited to 0°C to 125°C.

Q: Do all substitute parts include over-current protection? A: AP1084TG-U includes over-current and over-temperature protection, matching the original AP1084TL-U. LT1084CT#PBF includes over-temperature protection only. LD1084V includes over-temperature and short circuit protection.