FT511DB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The FT511DB is a linear voltage regulator IC from Fremont Micro Devices Ltd, designed for positive fixed 2.5V output applications with 150mA current capacity in a SOT-89-3LA surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The FT511DB serves applications requiring low-dropout regulation with minimal quiescent current draw in compact form factors.

Substiute Parts

FT511DB

Fremont Micro Devices LtdIn Stock: 1055FT511DB Datasheet

Current PartRFQ

MCP1700T-2502E/MB

Microchip TechnologyIn Stock: 17596MCP1700T-2502E/MB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FT511DB is determined by strict alignment of the following electrical and mechanical parameters:

• Fixed output voltage of 2.5V
• Surface mount SOT-89-3 package compatibility
• Positive output configuration
• Single regulator topology
• Operating temperature range support
• Over-current protection capability

The MCP1700T-2502E/MB qualifies as a direct substitute based on matching output voltage (2.5V fixed), identical package family (SOT-89-3), positive output configuration, and single regulator design. The substitute maintains functional equivalence within the specified electrical operating envelope.

Parameter Comparison

Engineering Selection Recommendations

The MCP1700T-2502E/MB is suitable for direct replacement of the FT511DB in applications where the following conditions are met:

• Circuit design accommodates the higher maximum input voltage (6V vs 5.5V)
• Application load current does not exceed 150mA, or system design can utilize the increased 250mA capability
• Higher quiescent current (4 µA vs 1.6 µA) is acceptable for the application power budget
• Extended operating temperature range (-40°C ~ 125°C) provides additional margin
• Active product status and ROHS3 compliance support long-term supply chain continuity

The substitute part provides enhanced protection features (over-temperature and short-circuit protection) beyond the original design, improving system robustness.

Frequently Asked Questions (FAQ)

Q: Can the MCP1700T-2502E/MB directly replace the FT511DB without PCB modifications?

A: Yes, both components use identical TO-243AA (SOT-89-3) package geometry and pinout configuration. No PCB layout changes are required for mechanical and electrical compatibility.

Q: What is the impact of the higher quiescent current in the MCP1700T-2502E/MB?

A: The MCP1700T-2502E/MB draws 4 µA versus 1.6 µA for the FT511DB. For battery-powered or ultra-low-power applications, this 2.4 µA difference may require power budget recalculation. For standard line-powered applications, this difference is negligible.

Q: Are there any thermal considerations when substituting these parts?

A: The MCP1700T-2502E/MB supports operation to 125°C versus 85°C for the FT511DB. Both parts are linear regulators with similar thermal characteristics in the SOT-89-3 package. Thermal performance depends on PCB layout, copper area, and ambient conditions rather than the part selection.

Q: Does the higher output current rating of the MCP1700T-2502E/MB affect circuit operation?

A: No. The 250mA rating of the substitute is a maximum specification. If the circuit draws 150mA or less, the regulator operates identically to the original part. The higher rating provides design margin and future scalability.

Q: What certifications and compliance standards apply to the substitute part?

A: The MCP1700T-2502E/MB is ROHS3 compliant and REACH unaffected. Both parts carry EAR99 ECCN classification and identical HTSUS codes (8542.39.0001), confirming regulatory equivalence.