KAS2-3P3 Equivalent & Substitute Parts Reference

Part Overview

The KAS2-3P3 is an enclosed AC/DC converter manufactured by TDK-Lambda Americas Inc, delivering 3.3V at 600mA with 2W power output. Designed for ITE (Commercial) applications, this unit accepts 90–305 VAC input and operates across -40°C to 80°C with derating. The product is classified as Obsolete, necessitating identification of active equivalent models to maintain supply chain continuity and support ongoing system requirements.

Substiute Parts

KAS2-3P3

TDK-Lambda Americas IncIn Stock: 1032KAS2-3P3 Datasheet

Current PartRFQ

KPSB6-3R3-E

TDK-Lambda Americas IncIn Stock: 1166KPSB6-3R3-E Datasheet

MFR RecommendedRFQ

TMPS 03-103

Traco PowerIn Stock: 878TMPS 03-103 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KAS2-3P3 is determined by the following critical parameters:

Output Specification Match:

• Output voltage must be 3.3V
• Output current capacity must meet or exceed 600mA
• Power rating must support the required load

Input Compatibility:

• Input voltage range must encompass or exceed 90–305 VAC
• Single-output configuration required

Physical & Mechanical Compatibility:

• Through-hole mounting type
• Package footprint must be compatible with existing PCB layouts

Regulatory & Compliance Alignment:

• RoHS compliance required
• Certifications must include CE and cURus or equivalent recognized agencies

Two active substitute models meet these criteria: KPSB6-3R3-E (TDK-Lambda Americas Inc) and TMPS 03-103 (Traco Power). Both deliver 3.3V output with current capacity exceeding 600mA, support through-hole mounting, and maintain full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

KPSB6-3R3-E Selection Criteria:

The KPSB6-3R3-E offers higher output current capacity (1.5A vs. 600mA) and superior efficiency (75% vs. 66%), with identical operating temperature range (-40°C to 80°C). This model is manufactured by the same supplier (TDK-Lambda Americas Inc), ensuring design continuity. However, the input voltage range is limited to 90–264 VAC, which does not extend to the original 305 VAC maximum. The 4-DIP package differs from the 5-DIP footprint of the KAS2-3P3, requiring PCB layout verification. Regulatory certifications are expanded (CE, CSA, FCC, UL), providing broader market compliance. This substitute is suitable for applications where the reduced input voltage ceiling is acceptable and PCB redesign is feasible.

TMPS 03-103 Selection Criteria:

The TMPS 03-103 maintains the 5-DIP package footprint, minimizing PCB layout modifications. Output current capacity (900mA) and efficiency (70%) exceed the original specification. The input range (85–264 VAC, 120–370 VDC) covers the original 90–305 VAC requirement and adds DC input capability. Operating temperature range (-25°C to 70°C) is narrower than the original, with the lower bound at -25°C versus -40°C. Regulatory certifications (CB, CE, cURus) align with the original approvals. This substitute is optimal for applications requiring minimal PCB modifications and extended DC input support, provided the reduced low-temperature operating limit is acceptable.

Compliance Considerations:

Both substitutes maintain RoHS compliance and CE certification. The TMPS 03-103 retains cURus approval matching the original. Selection should prioritize application-specific requirements regarding input voltage range, operating temperature extremes, and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can the KPSB6-3R3-E directly replace the KAS2-3P3 without PCB modifications?

A: The KPSB6-3R3-E uses a 4-DIP package versus the KAS2-3P3's 5-DIP package. Pin configuration and physical footprint differ, requiring PCB layout verification and potential redesign. Additionally, the input voltage maximum is 264 VAC, not 305 VAC. Electrical compatibility exists for the 3.3V output and 600mA load, but mechanical and input range differences necessitate engineering review.

Q: Is the TMPS 03-103 a drop-in replacement?

A: The TMPS 03-103 maintains the 5-DIP package format, supporting direct footprint compatibility. Output voltage (3.3V) and current capacity (900mA) exceed the original specification. The input range (85–264 VAC, 120–370 VDC) covers the original 90–305 VAC requirement. However, the operating temperature range (-25°C to 70°C) is narrower at the low end (-25°C vs. -40°C). Verify application temperature requirements before selection.

Q: What is the impact of the higher output current ratings in the substitute parts?

A: Both KPSB6-3R3-E (1.5A) and TMPS 03-103 (900mA) provide current capacity exceeding the original 600mA specification. This allows operation at higher load levels without thermal stress. No negative impact occurs when operating at or below the original 600mA load. Thermal performance and efficiency may improve due to higher power ratings and modern design.

Q: Are there input voltage compatibility concerns?

A: The KPSB6-3R3-E input range (90–264 VAC) does not extend to the original 305 VAC maximum. Applications requiring operation above 264 VAC must use the TMPS 03-103 (85–264 VAC, 120–370 VDC). The TMPS 03-103 also supports DC input (120–370 VDC), providing additional flexibility not present in the original design.

Q: How do operating temperature ranges compare?

A: The KAS2-3P3 operates -40°C to 80°C. The KPSB6-3R3-E matches this range exactly. The TMPS 03-103 operates -25°C to 70°C, with a higher minimum temperature (-25°C vs. -40°C) and lower maximum (70°C vs. 80°C). Applications requiring -40°C operation must use the KPSB6-3R3-E or KAS2-3P3. Applications requiring 80°C operation must use the KPSB6-3R3-E or KAS2-3P3.

Q: What certifications should I verify for my application?

A: The original KAS2-3P3 holds CE and cURus certifications. The KPSB6-3R3-E adds CSA, FCC, and UL certifications. The TMPS 03-103 includes CB, CE, and cURus certifications. Verify that your target market and application requirements align with the available certifications for each substitute.