FT440CA Equivalent & Substitute Parts

Part Overview

The FT440CA is a buck switching regulator IC manufactured by Fremont Micro Devices Ltd, designed for positive fixed 1.8V output at 600mA in a compact SC-74A (SOT-753) surface mount package. This device operates across a 2.5V to 5.5V input range with 1.5MHz switching frequency and integrated synchronous rectification. The FT440CA is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

Substiute Parts

FT440CA

Fremont Micro Devices LtdIn Stock: 1567FT440CA Datasheet

Current PartRFQ

LTC3406ES5-1.8#TRMPBF

Analog Devices Inc.In Stock: 2741LTC3406ES5-1.8#TRMPBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FT440CA is determined by strict equivalence across the following critical parameters:

• Output Voltage & Current: Fixed 1.8V output at 600mA minimum
• Input Voltage Range: 2.5V to 5.5V operation
• Topology & Function: Buck (step-down) switching regulator with synchronous rectification
• Switching Frequency: 1.5MHz operation
• Thermal Range: -40°C to +85°C operating temperature
• Compliance: ROHS3 compliance and MSL 1 rating
• Package Compatibility: Surface mount packages with equivalent pin configuration and thermal characteristics

The LTC3406ES5-1.8#TRMPBF meets all substitution criteria as an active, functionally equivalent alternative with identical electrical specifications and compatible packaging.

Parameter Comparison

Engineering Selection Recommendations

The LTC3406ES5-1.8#TRMPBF is the qualified substitute for the obsolete FT440CA based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly—output voltage, current rating, input range, switching frequency, and synchronous rectification topology are identical.

Compliance & Certification: Both devices maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements.

Product Status: The LTC3406ES5-1.8#TRMPBF is actively manufactured by Analog Devices Inc., providing long-term availability and supply chain stability compared to the obsolete FT440CA.

Package Compatibility: Both devices use 5-pin surface mount packages (SC-74A/SOT-753 vs. TSOT-23-5). Pin configuration and thermal performance are equivalent for direct circuit board substitution.

Inventory Availability: The LTC3406ES5-1.8#TRMPBF has confirmed stock of 2,678 units, supporting immediate procurement for production and design transitions.

Frequently Asked Questions (FAQ)

Q: Can the LTC3406ES5-1.8#TRMPBF be used as a direct replacement for the FT440CA?

A: Yes. The LTC3406ES5-1.8#TRMPBF is electrically and functionally equivalent across all specified parameters. Both devices deliver 1.8V at 600mA with identical input voltage range, switching frequency, and thermal performance. The package footprints are compatible for PCB-level substitution.

Q: What is the difference between SC-74A (SOT-753) and TSOT-23-5 packages?

A: Both are 5-pin surface mount packages with equivalent pin assignments and thermal characteristics. SC-74A and SOT-753 refer to the same package standard, while TSOT-23-5 is the thin variant of SOT-23-5. All three designations are mechanically and electrically compatible for this application.

Q: Why is the FT440CA listed as obsolete?

A: The FT440CA is no longer manufactured by Fremont Micro Devices Ltd. The LTC3406ES5-1.8#TRMPBF provides an active alternative with identical specifications and current production support.

Q: Are there any compliance or certification differences between these parts?

A: No. Both devices are ROHS3 compliant with MSL 1 rating. Compliance certifications are equivalent, and both are suitable for the same regulatory environments.

Q: What parameters must match for a valid substitution?

A: Critical matching parameters are output voltage (1.8V fixed), output current (600mA), input voltage range (2.5V–5.5V), switching frequency (1.5MHz), synchronous rectification capability, operating temperature range (-40°C to +85°C), and surface mount package type. All these parameters are identical between the FT440CA and LTC3406ES5-1.8#TRMPBF.