MCP1651ST-E/MS Equivalent & Substitute Parts

Part Overview

The MCP1651ST-E/MS is an active, production-status DC-DC controller IC from Microchip Technology designed for boost, flyback, and SEPIC topologies. This device functions as a transistor driver for positive output step-up and step-up/step-down applications. The part is supplied in tape and reel packaging with 691 units currently in stock. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and packaging options to support design flexibility and supply chain continuity.

Substiute Parts

MCP1651ST-E/MS

Microchip TechnologyIn Stock: 758MCP1651ST-E/MS Datasheet

Current PartRFQ

MCP1651S-E/MS

Microchip TechnologyIn Stock: 1140MCP1651S-E/MS Datasheet

DirectRFQ

MCP1650RT-E/MS

Microchip TechnologyIn Stock: 2635MCP1650RT-E/MS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MCP1651ST-E/MS are identified based on strict equivalence across the following critical parameters:

• Identical base product number (MCP1651 series)
• Matching topology support (Boost, Flyback, SEPIC)
• Identical output type and configuration (Transistor Driver, Positive)
• Matching electrical specifications (2.7V ~ 5.5V supply, 750kHz switching frequency, 80% max duty cycle)
• Compatible package and case dimensions (8-TSSOP, 8-MSOP)
• Identical operating temperature range (-40°C ~ 125°C)
• Equivalent compliance certifications (ROHS3, MSL 1)

Substitutes differ only in packaging format (tape & reel, tube, or cut tape) and inventory availability. All substitute parts maintain full functional and electrical equivalence.

Parameter Comparison

Engineering Selection Recommendations

All three parts—MCP1651ST-E/MS, MCP1651S-E/MS, and MCP1650RT-E/MS—are active production components from Microchip Technology with identical electrical and functional specifications. Selection between these parts is determined by packaging and supply requirements:

• MCP1651ST-E/MS (Tape & Reel): Suitable for high-volume automated assembly processes requiring continuous reel feeding.
• MCP1651S-E/MS (Tube): Appropriate for lower-volume production runs or manual assembly operations with 1102 units available.
• MCP1650RT-E/MS (Cut Tape & Digi-Reel®): Offers maximum inventory availability (2600 units) and flexibility for both manual and automated assembly with alternative reel format.

All parts maintain ROHS3 compliance and MSL 1 rating, confirming suitability for standard manufacturing and storage conditions without moisture sensitivity constraints.

Frequently Asked Questions (FAQ)

Q: Are MCP1651ST-E/MS, MCP1651S-E/MS, and MCP1650RT-E/MS electrically interchangeable?

A: Yes. All three parts share identical electrical specifications, including supply voltage range (2.7V ~ 5.5V), switching frequency (750kHz), duty cycle (80%), and supported topologies (Boost, Flyback, SEPIC). They are functionally equivalent and can be substituted without circuit redesign.

Q: What is the primary difference between these substitute parts?

A: The primary difference is packaging format. MCP1651ST-E/MS is supplied in tape and reel, MCP1651S-E/MS in tube, and MCP1650RT-E/MS in cut tape with Digi-Reel® option. All use the same 8-MSOP package with identical mechanical dimensions (0.118", 3.00mm width).

Q: Can I use MCP1650RT-E/MS as a direct replacement for MCP1651ST-E/MS in my design?

A: Yes. Both parts are pin-compatible, electrically equivalent, and support the same topologies and operating conditions. The substitution is valid for any application using the MCP1651ST-E/MS.

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

A: No. All three parts carry identical compliance certifications: ROHS3 compliance, MSL 1 rating, REACH unaffected status, and EAR99 ECCN classification.

Q: Which part should I select for high-volume production?

A: MCP1650RT-E/MS offers the highest inventory availability (2600 units) and supports both manual and automated assembly through its cut tape and Digi-Reel® packaging options, making it optimal for high-volume requirements.