SC4505MLTRT Equivalent & Substitute Parts

Part Overview

The SC4505MLTRT is a boost switching regulator IC manufactured by Semtech Corporation, designed for positive adjustable output applications. This device functions as a step-up converter with a single adjustable output, capable of delivering 700mA at switching frequencies up to 1MHz. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

SC4505MLTRT

Semtech CorporationIn Stock: 16526SC4505MLTRT Datasheet

Current PartRFQ

LT3489EMS8E#TRPBF

Analog Devices Inc.In Stock: 37584LT3489EMS8E#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC4505MLTRT is determined by functional equivalence across core electrical parameters: boost topology, positive adjustable output configuration, compatible input and output voltage ranges, and adequate output current capacity. The LT3489EMS8E#TRPBF qualifies as a manufacturer-recommended substitute based on the following alignment criteria:

Key Substitution Parameters:

• Topology: Both devices implement boost (step-up) switching regulation
• Output Configuration: Both provide positive adjustable output
• Input Voltage Compatibility: Both accept 2.6V minimum input; LT3489 extends to 16V maximum versus SC4505's 12V maximum
• Output Voltage Range: Both support 2.6V to 36V+ output range
• Output Current: LT3489 provides 2.5A (switch current), exceeding SC4505's 700mA requirement
• Operating Temperature: Identical range (-40°C to 85°C)
• Moisture Sensitivity: Both rated MSL 1

The LT3489EMS8E#TRPBF represents an enhanced alternative with superior current handling and extended input voltage specification, suitable for applications requiring the SC4505MLTRT's functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

The LT3489EMS8E#TRPBF is the manufacturer-recommended substitute for the obsolete SC4505MLTRT. Selection of this alternative is supported by:

Product Status: The LT3489 maintains active production status with Analog Devices Inc., ensuring long-term availability and supply chain continuity compared to the obsolete SC4505.

Compliance & Certifications: Both devices share identical operating temperature specifications (-40°C to 85°C) and MSL 1 moisture sensitivity ratings. The LT3489 carries RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Electrical Compatibility: The LT3489 exceeds SC4505 specifications across critical parameters—input voltage tolerance extends to 16V, output voltage capability reaches 40V, and output current capacity of 2.5A substantially exceeds the 700mA requirement. These enhancements provide design margin and support higher-power applications without functional compromise.

Package Consideration: The LT3489 uses an 8-pin MSOP package versus the SC4505's 16-pin VFQFN package. PCB layout redesign is required; however, the smaller footprint and reduced pin count may offer space and routing advantages in new designs.

Frequently Asked Questions (FAQ)

Q: Can the LT3489EMS8E#TRPBF directly replace the SC4505MLTRT without circuit modification?

A: Functional substitution is possible because both devices implement identical boost topology with positive adjustable output and compatible voltage/current specifications. However, package differences (16-VFQFN versus 8-MSOP) require PCB layout redesign. Pin configuration and feedback network topology must be verified against respective datasheets to ensure proper circuit operation.

Q: What are the key electrical advantages of the LT3489 over the SC4505?

A: The LT3489 provides extended input voltage range (to 16V versus 12V), higher output voltage capability (40V versus 36V), and significantly greater output current capacity (2.5A versus 700mA). Switching frequency is also doubled (2MHz versus 1MHz), potentially reducing output filter component size.

Q: Why is the SC4505MLTRT classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The LT3489EMS8E#TRPBF, maintained in active production by Analog Devices, provides functional equivalence with enhanced specifications and assured long-term availability.

Q: Are there moisture sensitivity or compliance differences between these parts?

A: Both devices are rated MSL 1 (unlimited moisture sensitivity level), indicating no special storage or handling requirements. The LT3489 carries RoHS3 compliance and REACH unaffected certification, meeting current environmental regulations.

Q: What design considerations apply when switching from SC4505 to LT3489?

A: Primary considerations include package footprint change (16-pin to 8-pin), PCB layout redesign, and feedback network reconfiguration. The higher switching frequency (2MHz) may reduce inductor and capacitor sizes. Thermal management may improve due to the smaller package and higher efficiency at the specified 700mA operating point.