LM1084IS-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM1084IS-ADJ is a positive adjustable linear voltage regulator manufactured by Texas Instruments, rated for 5A output current in a TO-263 (DDPAK-3) surface mount package. This device is classified as Last Time Buy, indicating limited availability of the original part number. The LM1084IS-ADJ provides adjustable output voltage from 1.25V to 27.5V with a maximum input voltage of 29V and includes over-current and over-temperature protection features. Finding equivalent and substitute parts is necessary due to product status constraints and to ensure design flexibility across manufacturing batches and supply chain variations.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM1084IS-ADJ
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Current - Output	5A
Voltage - Input (Max)	29V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	27.5V
Voltage Dropout (Max)	1.5V @ 5A
Current - Quiescent (Iq)	10 mA
PSRR	75dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the LM1084IS-ADJ are grouped based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Output Configuration: Positive
Output Type: Adjustable
Voltage - Output (Min/Fixed): 1.25V
Voltage - Output (Max): Must support application requirements
Package / Case: TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Mounting Type: Surface Mount
Protection Features: Over Current, Over Temperature

Substitution Categories:

Category 1: Direct Equivalent (Same Manufacturer, Same Specifications) LM1084IS-ADJ/NOPB is a direct equivalent from Texas Instruments with identical electrical specifications and packaging. The only difference is the packaging format (tube vs. alternative designation). This part is Active status, providing superior availability compared to the Last Time Buy original.

Category 2: Manufacturer Recommended Alternatives (Different Manufacturer, Reduced Current Rating) LT1086CM#PBF, LT1086CM#TRPBF, LT1086IM#PBF, and LT1086IM#TRPBF are Analog Devices Inc. alternatives. These parts share the same adjustable output voltage range (1.25V to 24.6V), identical package type (DDPAK-3), and equivalent protection features. The key difference is reduced output current rating (1.5A vs. 5A). These substitutes are suitable only for applications requiring ≤1.5A output current. Packaging variations (tube, cut tape, tape & reel) provide supply chain flexibility. Operating temperature ranges vary: LT1086CM variants support 0°C ~ 125°C, while LT1086IM variants support -40°C ~ 125°C.

Parameter Comparison

Parameter	LM1084IS-ADJ	LM1084IS-ADJ/NOPB	LT1086CM#PBF	LT1086CM#TRPBF	LT1086IM#PBF	LT1086IM#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Current - Output	5A	5A	1.5A	1.5A	1.5A	1.5A
Voltage - Input (Max)	29V	29V	25V	25V	25V	25V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage - Output (Max)	27.5V	27.5V	24.6V	24.6V	24.6V	24.6V
Voltage Dropout (Max)	1.5V @ 5A	1.5V @ 5A	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A
Current - Quiescent (Iq)	10 mA	10 mA	10 mA	10 mA	10 mA	10 mA
PSRR	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Last Time Buy	Active	Active	Active	Active	Active
Packaging Format	Tube	Tube	Tube	Cut Tape (CT) & Digi-Reel®	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (5A Output Current Required): Select LM1084IS-ADJ/NOPB. This part maintains identical electrical specifications and package compatibility with the original LM1084IS-ADJ. The part is Active status, ensuring continued availability and supply chain stability. Both parts are ROHS3 compliant and support the full -40°C ~ 125°C operating temperature range.

For Current-Limited Applications (≤1.5A Output Current): The Analog Devices LT1086 series (LT1086CM#PBF, LT1086CM#TRPBF, LT1086IM#PBF, LT1086IM#TRPBF) provides functional equivalence with reduced output current rating. All variants maintain the same adjustable output voltage range (1.25V to 24.6V), identical DDPAK-3 package, and equivalent protection features. Selection between variants depends on packaging requirements and operating temperature specifications. LT1086IM variants support -40°C ~ 125°C operation, matching the original part's temperature range. LT1086CM variants support 0°C ~ 125°C operation and are suitable for commercial temperature range applications. All Analog Devices alternatives feature MSL 1 (Unlimited), providing superior moisture handling compared to the original part's MSL 3 (168 Hours).

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the original LM1084IS-ADJ. ECCN and HTSUS classifications remain unchanged across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can LT1086 parts directly replace LM1084IS-ADJ in all applications? A: LT1086 parts are functionally equivalent only for applications requiring output current ≤1.5A. The LT1086 series has a maximum output current of 1.5A, while the LM1084IS-ADJ is rated for 5A. If your application requires 5A output current, use LM1084IS-ADJ/NOPB instead.

Q: What is the difference between LT1086CM and LT1086IM variants? A: The primary difference is operating temperature range. LT1086CM supports 0°C ~ 125°C (commercial temperature range), while LT1086IM supports -40°C ~ 125°C (industrial temperature range). Select LT1086IM for applications requiring extended low-temperature operation.

Q: Why do LT1086 parts have different maximum output voltages (24.6V vs. 27.5V)? A: The LT1086 series has a maximum input voltage of 25V, which limits the maximum adjustable output voltage to 24.6V. The LM1084IS-ADJ supports 29V input, allowing output voltage adjustment up to 27.5V. Verify your application's voltage requirements before substitution.

Q: Are packaging format differences (tube, cut tape, tape & reel) electrically significant? A: No. Tube, cut tape, and tape & reel formats contain identical die and electrical specifications. Packaging format selection is based on manufacturing and assembly process requirements. LT1086CM#PBF and LT1086IM#PBF are supplied in tube format. LT1086CM#TRPBF and LT1086IM#TRPBF are supplied in tape & reel format for automated assembly.

Q: What does MSL 3 (168 Hours) vs. MSL 1 (Unlimited) mean for component handling? A: MSL (Moisture Sensitivity Level) indicates moisture absorption limits. MSL 3 (168 Hours) means the component must be used within 168 hours of package opening under specified humidity conditions. MSL 1 (Unlimited) means the component has no time-based moisture absorption restrictions. Analog Devices LT1086 alternatives provide superior moisture tolerance.

Q: Is LM1084IS-ADJ/NOPB identical to LM1084IS-ADJ? A: Yes, electrically and mechanically identical. The /NOPB designation indicates "No Plumbum" (lead-free) packaging, consistent with ROHS3 compliance. Both support identical specifications and are interchangeable.

Q: Can I use LT1086 parts if my application requires the full 29V input voltage specification? A: No. LT1086 parts are rated for maximum 25V input voltage. If your design requires 29V input capability, use LM1084IS-ADJ or LM1084IS-ADJ/NOPB.

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