FAN1086DX Equivalent & Substitute Parts

Part Overview

The FAN1086DX is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications requiring 1.5A current capacity in a TO-252AA surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

The FAN1086DX operates as a single-output positive adjustable regulator with integrated over-current and over-temperature protection. Its primary application domain includes low-power voltage regulation circuits where adjustable output voltage between 1.25V and 6V is required.

Substiute Parts

FAN1086DX

onsemiIn Stock: 19458FAN1086DX Datasheet

Current PartRFQ

LD1086DTTR

STMicroelectronicsIn Stock: 37213LD1086DTTR Datasheet

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LD1086DTTRY

STMicroelectronicsIn Stock: 1789LD1086DTTRY Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the FAN1086DX is determined by strict equivalence across the following critical parameters:

• Package Compatibility: TO-252-3 DPAK form factor with identical pinout (2 Leads + Tab)
• Output Current Rating: 1.5A minimum
• Output Configuration: Positive adjustable topology
• Output Voltage Range: Minimum 1.25V lower bound; maximum output voltage must accommodate application requirements
• Dropout Voltage: 1.5V @ 1.5A specification
• Protection Features: Over-current and over-temperature protection required
• Mounting Type: Surface mount only

The identified substitute parts are STMicroelectronics LD1086DTTR and LD1086DTTRY, both of which maintain functional and mechanical equivalence to the FAN1086DX within the specified parameter constraints.

Parameter Comparison

Engineering Selection Recommendations

LD1086DTTR (Recommended for New Designs)

The LD1086DTTR is the primary substitute for the obsolete FAN1086DX. This part maintains full functional equivalence with superior specifications: active product status ensures long-term availability, RoHS3 compliance supports modern supply chain requirements, and extended input voltage range (30V maximum) provides design flexibility beyond the original 7.5V specification. The improved PSRR of 88dB (versus 72dB) offers enhanced noise rejection. Extended operating temperature range (-40°C to 125°C) accommodates broader environmental conditions.

LD1086DTTRY (Alternative for Automotive Applications)

The LD1086DTTRY provides an alternative path for designs requiring automotive-grade components. This part carries AEC-Q100 qualification and maintains identical electrical specifications to the LD1086DTTR. However, obsolete product status limits its suitability for new production designs. This option is appropriate only when existing automotive qualification documentation or supply agreements mandate this specific part number.

Frequently Asked Questions (FAQ)

Q: Can LD1086DTTR directly replace FAN1086DX in existing designs?

A: Yes. Both parts share identical package geometry (TO-252-3 DPAK), pinout configuration, output current rating (1.5A), dropout voltage specification (1.5V @ 1.5A), and protection features. The LD1086DTTR operates within the FAN1086DX output voltage range (1.25V to 6V) and maintains equivalent protection functionality.

Q: What are the key differences between LD1086DTTR and LD1086DTTRY?

A: Both parts are electrically identical. The primary distinction is product status: LD1086DTTR is active with ongoing manufacturing support, while LD1086DTTRY is obsolete. LD1086DTTRY includes AEC-Q100 automotive qualification, making it suitable only for designs with specific automotive requirements and existing supply agreements.

Q: Does the higher input voltage rating of LD1086DTTR (30V vs 7.5V) affect circuit design?

A: No. The higher maximum input voltage rating of the LD1086DTTR does not require circuit modifications. Designs operating within the original 7.5V input specification remain fully compatible. The expanded rating provides additional design margin and flexibility for future applications.

Q: Are there package or mounting differences between these parts?

A: No. All three parts use identical TO-252-3 DPAK surface mount packaging with the same pinout, lead spacing, and thermal characteristics. No PCB layout modifications are required for substitution.

Q: What compliance certifications apply to each part?

A: The LD1086DTTR carries RoHS3 compliance. The LD1086DTTRY includes both RoHS3 compliance and AEC-Q100 automotive qualification. The original FAN1086DX compliance status is not specified in available documentation.