FT510FB Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The FT510FB is a linear voltage regulator IC manufactured by Fremont Micro Devices Ltd, designed to deliver a fixed 3V output at 250mA in a surface-mount SOT-89-3LA package. This device is classified as obsolete, making substitute parts necessary for new designs and production continuity. The FT510FB provides positive fixed output regulation with over-current protection, suitable for low-power applications requiring stable 3V supply from input sources up to 6V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	250mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.16V @ 100mA (Typ)
Quiescent Current	1.1 µA
Package Type	SOT-89-3LA / TO-243AA
Operating Temperature Range	-40°C ~ 85°C
Protection Features	Over Current
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the FT510FB are selected based on strict electrical and mechanical compatibility criteria. The following parameters must match or be compatible:

Fixed output voltage of 3V
Output current capability of 250mA minimum
Input voltage rating of 6V or higher
Surface-mount SOT-89-3 package configuration
Over-current protection as minimum protection feature
Operating temperature range encompassing -40°C to 85°C

The two substitute parts identified—MCP1700T-3002E/MB and S-1206B30-U3T1U—meet all these criteria while offering active product status and enhanced specifications in certain parameters.

Parameter Comparison

Parameter	FT510FB	MCP1700T-3002E/MB	S-1206B30-U3T1U
Manufacturer	Fremont Micro Devices Ltd	Microchip Technology	ABLIC Inc.
Product Status	Obsolete	Active	Active
Output Voltage	3V	3V	3V
Output Current	250mA	250mA	250mA
Input Voltage (Max)	6V	6V	6.5V
Voltage Dropout (Max)	0.16V @ 100mA	0.35V @ 250mA	0.23V @ 100mA
Quiescent Current	1.1 µA	4 µA	1.5 µA
Package / Case	TO-243AA (SOT-89-3LA)	TO-243AA (SOT-89-3)	TO-243AA (SOT-89-3)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Protection Features	Over Current	Over Current, Over Temperature, Short Circuit	Over Current
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both substitute parts are suitable replacements for the obsolete FT510FB based on electrical and mechanical compatibility. Selection between them depends on specific application requirements:

MCP1700T-3002E/MB is recommended for applications requiring extended operating temperature range (-40°C to 125°C) and enhanced protection features including over-temperature and short-circuit protection. This part carries ROHS3 compliance and is actively manufactured by Microchip Technology with high inventory availability (35,400 pcs).

S-1206B30-U3T1U is recommended for applications where lower quiescent current (1.5 µA vs. 4 µA) and lower dropout voltage at 100mA (0.23V vs. 0.35V) are advantageous. This part maintains the same operating temperature range as the original FT510FB and carries ROHS3 compliance. Inventory availability is 2,586 pcs.

Both parts are REACH Unaffected and classified under ECCN EAR99 with identical HTSUS codes, ensuring regulatory consistency with the original part.

Frequently Asked Questions (FAQ)

Q: Can MCP1700T-3002E/MB be used as a direct replacement for FT510FB?

A: Yes. Both parts deliver 3V at 250mA in identical TO-243AA packages. The MCP1700T-3002E/MB offers extended temperature range (-40°C to 125°C vs. -85°C) and additional protection features, making it a compatible and enhanced substitute.

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

A: FT510FB has 0.16V dropout at 100mA, S-1206B30-U3T1U has 0.23V at 100mA, and MCP1700T-3002E/MB has 0.35V at 250mA. Lower dropout voltage reduces heat dissipation and improves efficiency in low-input-voltage applications.

Q: Are the packages physically identical?

A: Yes. All three parts use the TO-243AA package (SOT-89-3 configuration), enabling direct PCB footprint compatibility. Pin configuration remains consistent across all three devices.

Q: Which substitute offers the lowest quiescent current?

A: The FT510FB has the lowest quiescent current at 1.1 µA. The S-1206B30-U3T1U follows at 1.5 µA, while MCP1700T-3002E/MB draws 4 µA. For battery-powered applications, S-1206B30-U3T1U provides the closest match to the original part's low-power characteristics.

Q: Do all parts meet RoHS compliance?

A: MCP1700T-3002E/MB and S-1206B30-U3T1U are both ROHS3 compliant. The original FT510FB does not specify RoHS status. For new designs requiring RoHS compliance, either substitute part is suitable.

Q: What protection features does each part provide?

A: FT510FB and S-1206B30-U3T1U both provide over-current protection. MCP1700T-3002E/MB provides over-current, over-temperature, and short-circuit protection, offering enhanced circuit protection.

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