AP1084T50G-U Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The AP1084T50G-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 5V output at 5A maximum current in a TO-220-3 package. This device is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing production, maintenance, and design continuity. The regulator features integrated over-current and over-temperature protection, suitable for applications requiring stable 5V power delivery from input sources up to 12V.

Substiute Parts

AP1084T50G-U

Diodes IncorporatedIn Stock: 4776AP1084T50G-U Datasheet

Current PartRFQ

LT1084CT-5#PBF

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AP1084T50G-U is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Fixed output voltage of 5V
• Minimum output current rating of 5A
• Input voltage tolerance sufficient for 12V maximum input
• Dropout voltage performance at rated current
• Quiescent current characteristics
• Operating temperature range coverage (0°C ~ 125°C minimum)

Mechanical Compatibility Criteria:

• TO-220-3 package configuration (pin-compatible)
• Through-hole mounting type

Regulatory & Compliance Criteria:

• RoHS3 compliance
• REACH unaffected status
• Moisture sensitivity level 1 (unlimited)

The LT1084CT-5#PBF from Analog Devices Inc. meets all substitution criteria. While it features a higher maximum input voltage (20V vs. 12V) and slightly higher dropout voltage (1.5V vs. 1.4V @ 5A), these parameters remain within acceptable tolerance for applications designed for the AP1084T50G-U. The LT1084CT-5#PBF maintains identical output voltage, current rating, package configuration, and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The LT1084CT-5#PBF is the designated substitute for the obsolete AP1084T50G-U based on the following factors:

Product Status: The LT1084CT-5#PBF carries active product status from Analog Devices Inc., ensuring continued availability and manufacturing support, whereas the AP1084T50G-U is obsolete.

Compliance & Certifications: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement and deployment.

Electrical Performance: The substitute part delivers identical output voltage (5V) and current capacity (5A) with matching quiescent current (10 mA) and operating temperature range (0°C ~ 125°C). The increased maximum input voltage rating (20V) provides enhanced design margin without compromising performance in applications specified for 12V maximum input.

Package Compatibility: Identical TO-220-3 through-hole package configuration ensures direct mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the LT1084CT-5#PBF be used as a direct replacement for the AP1084T50G-U?

A: Yes. Both devices share identical output voltage (5V), output current (5A), quiescent current (10 mA), operating temperature range (0°C ~ 125°C), and TO-220-3 package configuration. The LT1084CT-5#PBF is pin-compatible and functionally equivalent for applications designed around the AP1084T50G-U specifications.

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

A: The AP1084T50G-U specifies 1.4V maximum dropout at 5A, while the LT1084CT-5#PBF specifies 1.5V maximum dropout at 5A. This 0.1V difference is negligible in most applications and does not affect substitution suitability.

Q: Why does the LT1084CT-5#PBF have a higher maximum input voltage rating?

A: The LT1084CT-5#PBF is rated for 20V maximum input versus 12V for the AP1084T50G-U. This represents a design enhancement in the substitute part and provides additional input voltage margin. Applications designed for 12V input operation remain fully compatible.

Q: Are there any protection feature differences?

A: The AP1084T50G-U includes both over-current and over-temperature protection. The LT1084CT-5#PBF includes over-temperature protection. For applications requiring over-current protection, external current-limiting circuitry may be necessary, depending on system design requirements.

Q: Is the packaging identical?

A: Yes. Both parts use TO-220-3 through-hole packaging with identical pin configuration, allowing direct PCB mounting without modification.

Q: Are both parts RoHS compliant?

A: Yes. Both the AP1084T50G-U and LT1084CT-5#PBF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.