LM1086CS-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM1086CS-ADJ is a positive adjustable linear voltage regulator manufactured by Texas Instruments, rated for 1.5A output current in a TO-263 (DDPAK-3) surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The part delivers adjustable output voltage from 1.2V to 15V with integrated protection features including over-current, over-temperature, and short-circuit protection.

Finding equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts future availability. Active production alternatives from Texas Instruments and other manufacturers provide equivalent or enhanced functionality with assured long-term supply.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Current - Output	1.5A
Voltage - Input (Max)	29V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	15V
Voltage Dropout (Max)	1.5V @ 1.5A
Current - Quiescent (Iq)	5 mA
PSRR	75dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C (TJ)
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM1086CS-ADJ are qualified based on the following critical parameters:

Electrical Compatibility Requirements:

Output configuration: Positive adjustable
Output current rating: 1.5A minimum
Adjustable output voltage range: Must support 1.2V to 15V or equivalent range
Voltage dropout: 1.5V @ 1.5A maximum
Protection features: Over-current and over-temperature protection minimum
Package compatibility: TO-263 or D2PAK footprint equivalents

Regulatory & Compliance Requirements:

RoHS3 compliance
Surface mount technology
REACH unaffected status

Substitutes are grouped into two categories: direct equivalents (identical electrical and package specifications) and manufacturer-recommended alternatives (equivalent functionality with minor parameter variations).

Parameter Comparison

Parameter	LM1086CS-ADJ	LM1086CS-ADJ/NOPB	LD1086D2MTR	LT1086CM#PBF	LT1086CM#TRPBF	LT1086IM#PBF	LT1086IM#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Current - Output	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A
Voltage - Input (Max)	29V	29V	30V	25V	25V	25V	25V
Voltage - Output (Min)	1.2V	1.2V	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage - Output (Max)	15V	15V	28.5V	24.6V	24.6V	24.6V	24.6V
Voltage Dropout (Max)	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A	1.5V @ 1.5A
Current - Quiescent (Iq)	5 mA	5 mA	10 mA	Not specified	Not specified	Not specified	Not specified
PSRR	75dB (120Hz)	75dB (120Hz)	88dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C	0°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	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK	TO-263-4, D2PAK
Mounting Type	Surface Mount	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	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent (Recommended for Immediate Replacement):

LM1086CS-ADJ/NOPB is the direct equivalent from Texas Instruments with Active product status. This part maintains identical electrical specifications, operating temperature range, and package configuration. The /NOPB suffix indicates lead-free RoHS3 compliance. This is the preferred choice for designs currently using LM1086CS-ADJ, as it requires no circuit redesign and provides assured supply continuity.

Alternative from STMicroelectronics:

LD1086D2MTR offers enhanced input voltage capability (30V vs. 29V maximum) and superior PSRR performance (88dB vs. 75dB). The extended operating temperature range (-40°C to 125°C) provides additional margin for industrial applications. Quiescent current is higher at 10mA. This part is suitable for applications requiring improved noise rejection or wider temperature operation.

Alternatives from Analog Devices Inc.:

LT1086CM#PBF and LT1086CM#TRPBF are functionally equivalent with identical electrical performance to the original part. Both feature MSL-1 moisture sensitivity rating (unlimited shelf life) compared to MSL-3 for the original. The primary difference is packaging format: tube (PBF) versus cut tape with digi-reel (TRPBF).

LT1086IM#PBF and LT1086IM#TRPBF extend the operating temperature range to -40°C to 125°C, providing enhanced performance in extreme temperature environments. These variants maintain all other electrical specifications identical to the LT1086CM series. Packaging options remain tube (PBF) or cut tape with digi-reel (TRPBF).

All Analog Devices alternatives carry Active product status with superior MSL ratings, ensuring long-term availability and reduced moisture-related field failures.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM1086CS-ADJ with LM1086CS-ADJ/NOPB without circuit modifications?

A: Yes. LM1086CS-ADJ/NOPB is a direct equivalent with identical electrical specifications, operating temperature range, and TO-263 package footprint. No circuit redesign is required.

Q: What is the key difference between Texas Instruments and Analog Devices alternatives?

A: All alternatives maintain the same 1.5A output current, adjustable voltage range, and 1.5V dropout specification. Analog Devices parts offer superior moisture sensitivity ratings (MSL-1 vs. MSL-3) and extended temperature options. Texas Instruments LM1086CS-ADJ/NOPB provides the most direct replacement path.

Q: Why does LD1086D2MTR show higher maximum output voltage (28.5V vs. 15V)?

A: The LD1086D2MTR supports a higher adjustable output voltage range (1.25V to 28.5V) due to its design. For applications requiring output voltages up to 15V, this part is fully compatible. The higher maximum rating provides additional design flexibility without affecting existing 15V applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected designation, meeting current environmental and regulatory requirements.

Q: What is the significance of the packaging suffix (PBF vs. TRPBF)?

A: PBF indicates tube packaging, while TRPBF indicates cut tape with digi-reel packaging. Both formats are electrically identical. Selection depends on assembly process requirements and volume handling preferences.

Q: Can I use LT1086IM#TRPBF in applications requiring 0°C to 125°C operation?

A: Yes. LT1086IM#TRPBF is rated for -40°C to 125°C operation, which exceeds the 0°C to 125°C requirement of the original LM1086CS-ADJ. The extended temperature range provides additional margin and is fully compatible with standard industrial temperature specifications.

Q: Which substitute offers the best noise performance?

A: LD1086D2MTR provides the highest PSRR at 88dB (120Hz) compared to 75dB for all other alternatives. This enhanced power supply rejection ratio makes it suitable for noise-sensitive analog applications.

Q: Are there any protection feature differences I should consider?

A: LM1086CS-ADJ includes over-current, over-temperature, and short-circuit protection. All STMicroelectronics and Analog Devices alternatives include over-current and over-temperature protection. The original part's short-circuit protection is not specified for alternatives, though typical linear regulator designs include inherent current limiting.

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