SIS03VE DC DC Converter 3.3V 9W Equivalent & Substitute Parts

Part Overview

The SIS03VE is a non-isolated Point-of-Load (PoL) module DC DC converter manufactured by Bel Power Solutions. This component delivers a fixed 3.3V output at up to 3A from a 4.5V to 5.5V input supply, providing 9W of power. The SIS03VE is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing system support, redesigns, and procurement continuity. Substitute parts must maintain functional compatibility while meeting the electrical and mechanical requirements of the original application.

Substiute Parts

SIS03VE

Bel Power SolutionsIn Stock: 939SIS03VE Datasheet

Current PartRFQ

R-743.3P

Recom PowerIn Stock: 986R-743.3P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SIS03VE must satisfy the following core electrical and mechanical criteria:

Electrical Compatibility Requirements:

• Output voltage fixed at 3.3V
• Input voltage range must encompass or exceed the minimum 4.5V requirement
• Output current capability must equal or exceed 3A
• Non-isolated topology
• Single output configuration

Mechanical Compatibility Requirements:

• Through-hole mounting capability
• SIP module package format
• Physical dimensions compatible with board layout constraints

Performance Criteria:

• Operating temperature range must support the application environment
• Efficiency rating of 93% or higher

The R-743.3P from Recom Power meets all substitution criteria. It provides 3.3V output at 4A (exceeding the 3A requirement), accepts input voltages from 4.5V to 28V (encompassing the 4.5V–5.5V range), operates across –40°C to +85°C (exceeding the –10°C to +70°C range), and maintains 93% efficiency. The R-743.3P is through-hole mounted in a 12-SIP module package and is currently in active production status with full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The R-743.3P is the qualified substitute for the obsolete SIS03VE based on the following engineering factors:

Electrical Sufficiency: The R-743.3P delivers 4A at 3.3V output, exceeding the SIS03VE's 3A specification. The input voltage range of 4.5V to 28V fully encompasses the original 4.5V to 5.5V requirement, providing additional design margin for input supply variations.

Thermal Performance: The R-743.3P operates across –40°C to +85°C, extending beyond the SIS03VE's –10°C to +70°C range. This broader operating window accommodates more demanding thermal environments without performance degradation.

Regulatory Compliance: The R-743.3P holds RoHS3 compliance status, meeting current environmental and regulatory requirements. The SIS03VE is RoHS non-compliant, making the R-743.3P the appropriate choice for applications subject to modern compliance mandates.

Production Status: The R-743.3P is in active production with 915 units in stock, ensuring long-term availability and supply chain stability. The SIS03VE's obsolete status creates procurement risk and limits future sourcing options.

Mechanical Integration: Both components use through-hole mounting in SIP module packages. The R-743.3P uses a 12-SIP format compared to the SIS03VE's 11-SIP format. PCB footprint verification is required during integration to confirm pin compatibility and board layout accommodation.

Frequently Asked Questions (FAQ)

Q: Can the R-743.3P directly replace the SIS03VE without circuit modifications?

A: The R-743.3P provides electrical compatibility in terms of output voltage (3.3V) and input voltage range (4.5V minimum). However, the package format differs (12-SIP versus 11-SIP), requiring PCB footprint verification. Pin-to-pin compatibility must be confirmed against the original schematic and board layout before direct substitution.

Q: What is the significance of the R-743.3P's higher output current rating (4A versus 3A)?

A: The higher current rating provides design margin and allows the converter to operate at lower thermal stress when delivering the original 3A load. This improves reliability and extends component life in the application.

Q: Does the R-743.3P's wider input voltage range (4.5V–28V) affect circuit design?

A: The wider input range does not require circuit modifications for applications operating within the original 4.5V–5.5V window. The extended range provides additional flexibility for future designs or applications with higher input supply voltages.

Q: Why is RoHS3 compliance important for the R-743.3P?

A: RoHS3 compliance ensures the component meets current environmental regulations and is suitable for commercial and industrial applications subject to regulatory requirements. The SIS03VE's non-compliant status may restrict its use in regulated markets.

Q: What mechanical considerations apply when substituting the R-743.3P?

A: The R-743.3P uses a 12-SIP module package versus the SIS03VE's 11-SIP format. Physical dimensions differ (32.2mm × 9.1mm × 15.0mm for R-743.3P versus 63.5mm × 14.0mm × 11.7mm for SIS03VE). PCB footprint, pin spacing, and board layout must be evaluated to confirm mechanical fit and electrical connectivity.

Q: Is the R-743.3P suitable for applications requiring the original operating temperature range?

A: Yes. The R-743.3P's operating range of –40°C to +85°C fully encompasses the SIS03VE's –10°C to +70°C specification, ensuring thermal compatibility and performance across the original application environment.

Q: What is the packaging format for the R-743.3P?

A: The R-743.3P is supplied in tube packaging, whereas the SIS03VE packaging format is not specified in the available data. Verify packaging requirements for your procurement and assembly processes.