LT3085MPMS8E Equivalent & Substitute Parts

Part Overview

The LT3085MPMS8E is a linear voltage regulator IC from Analog Devices Inc. designed for positive adjustable output applications. This device delivers 500mA output current in a compact 8-MSOP surface mount package with exposed pad. The regulator features adjustable output voltage from 0V to 36V with integrated protection against overcurrent, overtemperature, and short circuit conditions.

The LT3085MPMS8E carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing support and improved specifications where applicable.

Substiute Parts

LT3085MPMS8E

Analog Devices Inc.In Stock: 736LT3085MPMS8E Datasheet

Current PartRFQ

LT3085MPMS8E#PBF

Analog Devices Inc.In Stock: 26452LT3085MPMS8E#PBF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LT3085MPMS8E is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

• Output configuration must be positive
• Output type must be adjustable
• Single regulator configuration
• Maximum input voltage: 36V
• Output voltage range: 0V to 36V
• Output current capacity: 500mA
• Operating temperature range: -55°C to 125°C
• Protection features: Over current, over temperature, and short circuit protection

Mechanical Compatibility Requirements:

• Surface mount mounting type
• 8-MSOP package with exposed pad (0.118", 3.00mm width)

Functional Equivalence:

• Quiescent current: 10.1 µA
• PSRR: 90dB ~ 20dB (120Hz ~ 1MHz)
• Supply current (max): 1 mA

Parts meeting all these criteria are considered direct substitutes and can be used interchangeably in circuit designs without modification to PCB layout or schematic topology.

Parameter Comparison

Engineering Selection Recommendations

LT3085MPMS8E#PBF is the direct substitute for the obsolete LT3085MPMS8E. Both parts share identical electrical specifications, functional characteristics, and mechanical packaging. The substitute part carries active product status from Analog Devices Inc., ensuring ongoing manufacturing support and availability.

The LT3085MPMS8E#PBF provides improved dropout voltage performance at 0.45V compared to the original part's 1.6V at 500mA output current. This enhancement reduces thermal dissipation requirements and improves efficiency in power-limited applications.

The substitute part is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution. The tube packaging format of the substitute part supports standard automated assembly processes.

Selection of the LT3085MPMS8E#PBF eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing designs. No circuit modifications, PCB layout changes, or design revalidation are required for this substitution.

Frequently Asked Questions (FAQ)

Q: Can the LT3085MPMS8E#PBF be used as a direct replacement for the LT3085MPMS8E?

A: Yes. Both parts are electrically and mechanically equivalent. They share identical output configuration, adjustable output type, 500mA current capacity, 36V maximum input voltage, 0V to 36V output range, and 8-MSOP package specifications. The substitute part is actively manufactured and carries improved dropout voltage performance.

Q: What is the difference in dropout voltage between these parts?

A: The LT3085MPMS8E specifies 1.6V maximum dropout at 500mA, while the LT3085MPMS8E#PBF specifies 0.45V maximum dropout at the same current level. This improvement reduces power dissipation and thermal load in the regulator.

Q: Are there any package or pinout differences?

A: No. Both parts use the identical 8-MSOP package with exposed pad (0.118", 3.00mm width). Pinout, PCB footprint, and thermal pad dimensions are identical. No PCB redesign is necessary.

Q: What is the significance of the #PBF suffix?

A: The #PBF suffix indicates lead-free (Pb-free) construction, meeting ROHS3 compliance requirements. This is the standard manufacturing format for current production.

Q: Why is the original LT3085MPMS8E marked as obsolete?

A: The original part has been superseded by the LT3085MPMS8E#PBF, which offers improved specifications and compliance with current environmental regulations. Analog Devices Inc. has transitioned production to the active substitute part.

Q: Are there any thermal or performance considerations when substituting?

A: The improved dropout voltage of the substitute part results in lower thermal dissipation. Thermal design calculations based on the original 1.6V dropout will remain conservative when using the substitute part with 0.45V dropout, providing additional design margin.

Q: What is the moisture sensitivity level for both parts?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.

Q: Are regulatory certifications identical?

A: Both parts carry EAR99 ECCN and 8542.39.0001 HTSUS classifications. The substitute part additionally specifies ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.