UCC283T-5 Equivalent & Substitute Parts

Part Overview

The UCC283T-5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 3A in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The UCC283T-5 provides integrated protection features including over-current, over-temperature, reverse polarity, short-circuit, and under-voltage lockout (UVLO) protection, making it suitable for applications requiring robust power management in industrial and consumer electronics.

Key Parameters

Parameter	UCC283T-5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive Fixed
Voltage Output (Fixed)	5V
Current Output	3A
Voltage Input (Max)	9V
Voltage Dropout (Max)	0.6V @ 3A
Current Quiescent (Iq)	650 µA
Package / Case	TO-220-3
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UCC283T-5 is determined by the following critical parameters:

Output voltage fixed at 5V
Output current capability of 3A minimum
Positive output configuration
TO-220 package family (TO-220-3 or TO-220-5 compatible)
Maximum input voltage tolerance of 9V or greater
Dropout voltage performance at rated current
Protection features (over-current, over-temperature minimum)
RoHS3 compliance and REACH unaffected status

Two substitute parts meet these criteria:

LM1085IT-5.0/NOPB - Direct functional replacement with enhanced specifications and active product status
UCC283T-ADJ - Same manufacturer series with adjustable output capability, allowing 5V fixed configuration through external resistor network

Parameter Comparison

Parameter	UCC283T-5	LM1085IT-5.0/NOPB	UCC283T-ADJ
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive Fixed	Positive Fixed	Positive Adjustable
Voltage Output	5V	5V	1.22V - 8.5V
Current Output	3A	3A	3A
Voltage Input (Max)	9V	25V	9V
Voltage Dropout (Max)	0.6V @ 3A	1.5V @ 3A	0.6V @ 3A
Current Quiescent (Iq)	650 µA	10 mA	650 µA
Package / Case	TO-220-3	TO-220-3	TO-220-5
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

LM1085IT-5.0/NOPB is the primary recommended substitute for the obsolete UCC283T-5. This part maintains identical output voltage (5V) and current (3A) specifications with the same TO-220-3 package, enabling direct board-level replacement. The LM1085IT-5.0/NOPB offers active product status with extended operating temperature range (-40°C to 125°C junction temperature versus -40°C to 85°C ambient), improved input voltage tolerance (25V maximum versus 9V), and full RoHS3 and REACH compliance. The increased quiescent current (10 mA versus 650 µA) and higher dropout voltage (1.5V versus 0.6V) must be evaluated for power budget and thermal management in the target application.

UCC283T-ADJ provides an alternative within the same UCC283 series family. This adjustable output variant maintains the same dropout voltage (0.6V @ 3A), quiescent current (650 µA), and input voltage maximum (9V) as the original UCC283T-5. The TO-220-5 package accommodates external resistor divider networks for fixed 5V output configuration. This option is suitable for designs requiring output voltage flexibility or where existing board layouts accommodate the five-pin package.

Both substitutes maintain compliance with RoHS3 and REACH requirements, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can the LM1085IT-5.0/NOPB be used as a direct drop-in replacement for the UCC283T-5?

A: Yes, the LM1085IT-5.0/NOPB is pin-compatible in the TO-220-3 package and provides identical 5V fixed output at 3A. No circuit modifications are required for basic functionality. However, the increased quiescent current and dropout voltage should be evaluated for power dissipation and minimum input voltage requirements in your specific application.

Q: What is the difference between the UCC283T-5 and UCC283T-ADJ?

A: The UCC283T-5 provides a fixed 5V output, while the UCC283T-ADJ is an adjustable variant allowing output voltage configuration from 1.22V to 8.5V through external resistor networks. Both share identical electrical performance characteristics (dropout voltage, quiescent current, protection features) and input voltage limits. The UCC283T-ADJ uses a TO-220-5 package instead of TO-220-3.

Q: Are there package compatibility considerations when substituting these parts?

A: The LM1085IT-5.0/NOPB maintains the TO-220-3 package, requiring no PCB modifications. The UCC283T-ADJ uses a TO-220-5 package with two additional pins for the resistor divider network. Board layout and thermal management considerations remain consistent across all three parts due to identical power dissipation characteristics at rated output current.

Q: How do the protection features compare across these parts?

A: The UCC283T-5 and UCC283T-ADJ both include over-current, over-temperature, reverse polarity, short-circuit, and under-voltage lockout (UVLO) protection. The LM1085IT-5.0/NOPB provides over-current and over-temperature protection. Applications requiring reverse polarity or UVLO protection should use the UCC283T-ADJ or verify that the LM1085IT-5.0/NOPB protection features meet system requirements.

Q: What is the inventory status of these substitute parts?

A: The LM1085IT-5.0/NOPB has 12,300 pieces in stock with active product status. The UCC283T-ADJ has 3,275 pieces in stock with active product status. Both parts are readily available for procurement, unlike the obsolete UCC283T-5.

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