FT511BB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The FT511BB is a linear voltage regulator IC from Fremont Micro Devices Ltd, designed for positive fixed 1.5V 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 substitute parts essential for ongoing design support and production continuity. The FT511BB serves applications requiring low-dropout regulation with integrated over-current protection in compact form factors.

Substiute Parts

FT511BB

Fremont Micro Devices LtdIn Stock: 1116FT511BB Datasheet

Current PartRFQ

RT9169-15GX

Richtek USA Inc.In Stock: 788RT9169-15GX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FT511BB are identified based on the following critical parameters that determine functional equivalence:

• Fixed output voltage of 1.5V
• Surface mount package compatibility (SOT-89-3 or equivalent TO-243AA footprint)
• Operating temperature range of -40°C to 85°C
• Over-current protection feature
• Positive output configuration with single regulator
• Maximum input voltage rating of 5.5V or higher

The RT9169-15GX meets these core substitution criteria. While the RT9169-15GX has a reduced output current rating of 100mA compared to the FT511BB's 150mA, it maintains voltage regulation at the same 1.5V fixed output and operates within the same temperature range. Both devices use compatible SOT-89-3 packaging and provide over-current protection.

Parameter Comparison

Engineering Selection Recommendations

The RT9169-15GX is an active product from Richtek USA Inc. and represents the primary substitute for the obsolete FT511BB. Selection of the RT9169-15GX is supported by:

• Identical fixed output voltage specification (1.5V)
• Compatible surface mount package footprint (SOT-89-3)
• Matching operating temperature range (-40°C to 85°C)
• Integrated over-current protection
• RoHS3 compliance and REACH unaffected status
• Higher maximum input voltage rating (6V vs 5.5V) providing design margin

The primary design consideration is the reduced output current capacity of the RT9169-15GX (100mA vs 150mA). Applications requiring the full 150mA output current of the FT511BB must evaluate whether the 100mA rating of the RT9169-15GX is sufficient for the intended load. The slightly higher dropout voltage (0.6V vs 0.45V) and quiescent current (7 µA vs 1.6 µA) should be assessed for power-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the RT9169-15GX directly replace the FT511BB in existing designs?

A: The RT9169-15GX is footprint-compatible and provides the same 1.5V output voltage. However, the reduced output current rating (100mA vs 150mA) must be verified against actual load requirements. If the application draws less than 100mA, direct substitution is feasible without circuit modification.

Q: What is the package compatibility between FT511BB and RT9169-15GX?

A: Both devices use the SOT-89-3 package with TO-243AA case designation. The physical footprint and pin configuration are compatible, allowing PCB-level substitution without layout changes.

Q: Why does the RT9169-15GX have higher quiescent current than the FT511BB?

A: The RT9169-15GX quiescent current of 7 µA is higher than the FT511BB's 1.6 µA. This difference should be evaluated in battery-powered or ultra-low-power applications where standby current is critical.

Q: Are there compliance differences between the FT511BB and RT9169-15GX?

A: The RT9169-15GX carries RoHS3 compliance certification, while the FT511BB status is not specified. Both are REACH unaffected and classified under ECCN EAR99. The RT9169-15GX's active product status ensures ongoing availability and support.

Q: What input voltage margin does the RT9169-15GX provide compared to the FT511BB?

A: The RT9169-15GX supports a maximum input voltage of 6V, compared to the FT511BB's 5.5V. This provides an additional 0.5V design margin for input supply variations.