FAN1086MX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The FAN1086MX is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications with 1.5A current capacity in a TO-263-3 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The FAN1086MX operates with an input voltage range up to 7.5V and adjustable output from 1.25V to 6V, incorporating over-current and over-temperature protection features suitable for power management applications requiring compact form factors and reliable thermal management.

Key Parameters

Parameter	FAN1086MX Specification
Manufacturer	onsemi
Product Status	Obsolete
Output Configuration	Positive Adjustable
Output Current	1.5A
Input Voltage (Max)	7.5V
Output Voltage Range	1.25V to 6V
Voltage Dropout (Max)	1.5V @ 1.5A
PSRR	72dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	25°C to 125°C
Package Type	TO-263-3 (D2PAK, 3 Leads + Tab)
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the FAN1086MX is determined by the following critical parameters that must be maintained or exceeded:

Core Electrical Requirements:

Output current capability: minimum 1.5A
Output voltage adjustability: minimum range 1.25V to 6V (or higher)
Voltage dropout: maximum 1.5V @ 1.5A
Output configuration: positive adjustable
Protection features: over-current and over-temperature protection

Package and Mechanical Requirements:

Surface mount package: TO-263 family (D2PAK configuration acceptable)
Pin count and lead configuration: compatible with TO-263-3 or TO-263-4 footprints
Thermal characteristics: suitable for D2PAK thermal management

Environmental and Compliance Requirements:

Moisture sensitivity: MSL 1 preferred for unlimited shelf life
RoHS compliance: ROHS3 compliant parts preferred for regulatory alignment
Operating temperature: minimum -40°C to 125°C range preferred for extended applications

Substitute parts are grouped into two categories: Direct Functional Equivalents (matching all core parameters) and Enhanced Capability Substitutes (exceeding input voltage or output voltage range specifications while maintaining 1.5A output current and compatible packaging).

Parameter Comparison

Part Number	Manufacturer	Status	Output Current	Input Voltage (Max)	Output Voltage Range	Dropout (Max)	PSRR (120Hz)	Package	Temp Range	MSL
FAN1086MX	onsemi	Obsolete	1.5A	7.5V	1.25V–6V	1.5V	72dB	TO-263-3	25–125°C	1
LD1086D2MTR	STMicroelectronics	Active	1.5A	30V	1.25V–28.5V	1.5V	88dB	D2PAK	-40–125°C	1
LD1086D2TTR	STMicroelectronics	Active	1.5A	30V	1.25V–28.5V	1.5V	88dB	D2PAK	-40–125°C	1
LM1086CS-ADJ/NOPB	Texas Instruments	Active	1.5A	29V	1.2V–15V	1.5V	75dB	TO-263	0–125°C	3
LM1086CSX-ADJ/NOPB	Texas Instruments	Active	1.5A	29V	1.2V–15V	1.5V	75dB	TO-263	0–125°C	3
LM1086IS-ADJ/NOPB	Texas Instruments	Active	1.5A	29V	1.2V–15V	1.5V	75dB	TO-263	-40–125°C	3
LM1086ISX-ADJ/NOPB	Texas Instruments	Active	1.5A	29V	1.2V–15V	1.5V	75dB	TO-263	-40–125°C	3
LT1086CM#PBF	Analog Devices Inc.	Active	1.5A	25V	1.25V–24.6V	1.5V	75dB	DDPAK-3	0–125°C	1
LT1086CM#TRPBF	Analog Devices Inc.	Active	1.5A	25V	1.25V–24.6V	1.5V	75dB	DDPAK-3	0–125°C	1
LT1086IM#PBF	Analog Devices Inc.	Active	1.5A	25V	1.25V–24.6V	1.5V	75dB	DDPAK-3	-40–125°C	1
LT1086IM#TRPBF	Analog Devices Inc.	Active	1.5A	25V	1.25V–24.6V	1.5V	75dB	DDPAK-3	-40–125°C	1

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The STMicroelectronics LD1086D2MTR and LD1086D2TTR are the most direct functional replacements. Both devices maintain the 1.5A output current, 1.5V dropout specification, and D2PAK package footprint. These parts exceed the FAN1086MX input voltage specification (30V vs. 7.5V) and output voltage range (1.25V–28.5V vs. 1.25V–6V), providing enhanced capability for applications requiring higher input or output voltages. Both are active products with MSL 1 rating and extended operating temperature range (-40°C to 125°C), ensuring long-term availability and reliability.

Secondary Substitutes (Active Status with Extended Temperature Range):

The Analog Devices LT1086 series (LT1086IM#PBF and LT1086IM#TRPBF) offer MSL 1 moisture sensitivity and extended temperature operation (-40°C to 125°C). These devices maintain 1.5A output current and 1.5V dropout specifications with DDPAK-3 packaging compatible with TO-263 footprints. The output voltage range (1.25V–24.6V) exceeds the FAN1086MX specification, supporting broader application requirements.

Alternative Substitutes (Active Status, Standard Temperature Range):

The Texas Instruments LM1086 series (LM1086CS-ADJ/NOPB, LM1086CSX-ADJ/NOPB, LM1086IS-ADJ/NOPB, LM1086ISX-ADJ/NOPB) are active products with TO-263 packaging and 1.5A output current. The IS and ISX variants support extended temperature operation (-40°C to 125°C). All LM1086 variants feature higher input voltage capability (29V) and expanded output voltage range (1.2V–15V). MSL 3 rating requires controlled storage conditions (168 hours maximum).

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The STMicroelectronics and Analog Devices options with MSL 1 rating provide superior shelf-life characteristics compared to Texas Instruments MSL 3 parts, reducing storage and handling constraints in manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can I directly replace FAN1086MX with any of these substitute parts?

A: Direct PCB-level replacement is possible with parts sharing the TO-263 or D2PAK package footprint. The LD1086D2MTR, LD1086D2TTR, and LT1086 series (DDPAK-3) are mechanically and electrically compatible. Texas Instruments LM1086 parts use TO-263 (DDPAK-3) packaging, also compatible with the original TO-263-3 footprint. Verify pin configuration and lead spacing with your PCB layout before implementation.

Q: What is the difference between D2PAK and DDPAK-3 packaging?

A: D2PAK and DDPAK-3 are equivalent designations for the same TO-263 surface mount package with three leads plus a thermal tab. Both terms refer to the same physical form factor and pin configuration, ensuring mechanical and thermal compatibility across substitute parts.

Q: Why do some substitutes have higher input voltage ratings than the FAN1086MX?

A: The STMicroelectronics LD1086 series and Analog Devices LT1086 series are designed for broader application ranges, supporting input voltages up to 25V–30V. These higher ratings do not affect compatibility with circuits designed for the FAN1086MX's 7.5V maximum input. The regulator will operate correctly at lower input voltages; the higher rating simply indicates the device's maximum safe operating limit.

Q: What does MSL rating mean, and why does it matter?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be stored in standard conditions before requiring baking to remove absorbed moisture. MSL 1 (unlimited shelf life) parts like the LD1086 and LT1086 series require no special storage precautions. MSL 3 (168 hours) parts like the LM1086 series must be used within 168 hours of opening the original packaging or require moisture baking before assembly.

Q: Are all substitute parts currently in stock?

A: All listed substitute parts are classified as active products with documented inventory availability. The LD1086D2TTR has the highest inventory (16,667 units), followed by LM1086ISX-ADJ/NOPB (7,627 units) and LM1086CSX-ADJ/NOPB (16,157 units). Verify current stock status with your component supplier before finalizing procurement decisions.

Q: Which substitute offers the best thermal performance?

A: All substitute parts share the same D2PAK/DDPAK-3 thermal package with identical tab area and thermal characteristics. Thermal performance is equivalent across all listed substitutes. Selection should be based on electrical specifications, temperature range requirements, and supply chain availability rather than thermal considerations.

Q: Can I use LM1086 parts in applications requiring extended temperature operation?

A: Yes. The LM1086IS-ADJ/NOPB and LM1086ISX-ADJ/NOPB variants support -40°C to 125°C operation, matching extended temperature requirements. The LM1086CS-ADJ/NOPB and LM1086CSX-ADJ/NOPB variants operate from 0°C to 125°C, suitable for standard industrial applications. Verify your application's temperature requirements before selecting the appropriate variant.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) and Cut Tape (CT) packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both packaging formats contain identical components; selection depends on your assembly process and production volume requirements.

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