KPS5-3R3 Equivalent & Substitute Parts

Part Overview

The KPS5-3R3 is an open frame AC/DC converter manufactured by TDK-Lambda Americas Inc, delivering 3.3V at 1.25A output from a universal 85–264 VAC input. This 5W converter is designed for ITE (Commercial) applications and features a 4-DIP module form factor with through-hole mounting.

The KPS5-3R3 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or field replacement requirements for systems currently utilizing this converter.

Substiute Parts

KPS5-3R3

TDK-Lambda Americas IncIn Stock: 1147KPS5-3R3 Datasheet

Current PartRFQ

KPSA5-3R3

TDK-Lambda Americas IncIn Stock: 1154KPSA5-3R3 Datasheet

DirectRFQ

KPSB6-3R3

TDK-Lambda Americas IncIn Stock: 978KPSB6-3R3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KPS5-3R3 are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Output voltage: 3.3V (fixed requirement)
• Package / Case: 4-DIP Module (mechanical fit)
• Mounting type: Through Hole (PCB integration)
• Input voltage range: Universal AC input (85–264 VAC or 90–264 VAC)
• Power rating: 5W (thermal and electrical envelope)
• Approval standards: CE, CSA, UL (regulatory compliance)

Substitute Categories:

Category 1: Direct Functional Equivalent The KPSA5-3R3 maintains identical electrical specifications and mechanical form factor. It is an active product from the same manufacturer series, offering improved efficiency (72% vs. 70%) and identical regulatory compliance.

Category 2: Enhanced Capability Substitute The KPSB6-3R3 provides higher output current capacity (1.5A vs. 1.25A), extended operating temperature range (−40°C to +80°C vs. 0°C to +70°C), improved efficiency (75%), and additional features (adjustable output). Physical dimensions differ, requiring PCB layout verification. Input voltage range is 90–264 VAC (slightly narrower than 85–264 VAC).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select the KPSA5-3R3 when an exact functional equivalent is required. This part maintains identical electrical performance, regulatory compliance (CE, CSA, EN, UL), and mechanical form factor. The KPSA5-3R3 is an active product with improved efficiency (72%) and equivalent operating temperature range. No PCB layout modifications are necessary.

For Enhanced Performance Applications: Select the KPSB6-3R3 when higher output current capacity (1.5A vs. 1.25A), extended temperature operation (−40°C to +80°C), or improved efficiency (75%) is required. This part includes adjustable output capability and FCC approval in addition to CE, CSA, and UL certifications. Physical dimensions are significantly smaller (39.5 × 19.4 × 18.3 mm vs. 55.1 × 35.1 × 20.1 mm), requiring PCB layout verification and potential mechanical redesign. Input voltage minimum is 90 VAC (vs. 85 VAC for the main part).

Regulatory and Compliance Considerations: All substitute parts maintain RoHS compliance and carry equivalent or expanded regulatory approvals. The KPSB6-3R3 includes FCC approval, suitable for applications requiring electromagnetic compatibility certification.

Frequently Asked Questions (FAQ)

Q1: Can the KPSA5-3R3 be used as a direct drop-in replacement for the KPS5-3R3?

A: Yes. The KPSA5-3R3 is a direct functional equivalent. Both parts deliver 3.3V output, feature identical 4-DIP module packaging, through-hole mounting, and equivalent regulatory approvals. Dimensions are nearly identical (55.1 × 32.6 × 21.1 mm vs. 55.1 × 35.1 × 20.1 mm), with only minor width and height variations. No PCB modifications are required.

Q2: What are the key differences between the KPSB6-3R3 and the KPS5-3R3?

A: The KPSB6-3R3 provides higher output current (1.5A vs. 1.25A), extended operating temperature range (−40°C to +80°C vs. 0°C to +70°C), improved efficiency (75% vs. 70%), and adjustable output capability. Physical dimensions are significantly smaller. The input voltage range is 90–264 VAC (vs. 85–264 VAC). Line regulation is ±1% (vs. ±0.5%). These differences require PCB layout verification before implementation.

Q3: Is the KPSB6-3R3 suitable for applications requiring 85 VAC minimum input?

A: No. The KPSB6-3R3 specifies a minimum input voltage of 90 VAC. Applications requiring operation at 85 VAC must use the KPS5-3R3 or KPSA5-3R3, both of which support 85–264 VAC input.

Q4: What packaging options are available for these converters?

A: The KPS5-3R3 is supplied in standard packaging (not specified). The KPSA5-3R3 is available in Bulk packaging. The KPSB6-3R3 is supplied in Tube packaging. Packaging selection may affect procurement lead times and minimum order quantities.

Q5: Are all substitute parts RoHS compliant?

A: Yes. The KPS5-3R3, KPSA5-3R3, and KPSB6-3R3 are all RoHS compliant. All parts are suitable for applications subject to RoHS regulations.

Q6: Which substitute part should be selected for new designs?

A: For new designs, the KPSA5-3R3 (active product, improved efficiency) or KPSB6-3R3 (enhanced performance, extended temperature range) are recommended. The KPS5-3R3 is obsolete and should not be specified for new applications. Selection between KPSA5-3R3 and KPSB6-3R3 depends on thermal requirements, output current demand, and PCB layout constraints.