KAS2-12 AC/DC Converter Equivalent & Substitute Parts

Part Overview

The KAS2-12 is an enclosed AC/DC converter manufactured by TDK-Lambda Americas Inc., designed to deliver 12V output at 167mA maximum current with 2W power rating. This unit accepts 90–305 VAC input and operates across -40°C to 80°C with derating. The KAS2-12 is classified as obsolete, necessitating identification of functionally equivalent substitute components for ongoing system support and new designs.

Substiute Parts

KAS2-12

TDK-Lambda Americas IncIn Stock: 660KAS2-12 Datasheet

Current PartRFQ

KPSB6-12-E

TDK-Lambda Americas IncIn Stock: 1140KPSB6-12-E Datasheet

MFR RecommendedRFQ

BAC3S12DC

Murata Power Solutions Inc.In Stock: 980BAC3S12DC Datasheet

MFR RecommendedRFQ

TMPS 03-112

Traco PowerIn Stock: 954TMPS 03-112 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KAS2-12 are selected based on the following criteria:

Primary Compatibility Parameters:

• Output voltage: 12V (exact match required)
• Number of outputs: Single output (1)
• Mounting type: Through Hole
• Package category: DIP Module format
• Input voltage compatibility: Minimum 90 VAC support
• Output current capacity: Equal to or greater than 167mA
• Operating temperature range: Minimum -40°C lower bound
• Regulatory compliance: CE and cURus certifications

Substitution Logic: All identified substitute parts maintain 12V output voltage and through-hole mounting. Substitute candidates exceed the 167mA current requirement, providing design margin. Input voltage ranges vary; substitutes support either the original 90–305 VAC range or extended universal input (85–264 VAC AC with 120–370 VDC DC capability). All substitutes carry active product status and current manufacturing availability, addressing the obsolescence of the KAS2-12.

Parameter Comparison

Engineering Selection Recommendations

KPSB6-12-E (TDK-Lambda Americas Inc): This substitute offers the highest output current capacity (500mA) and power rating (6W), providing substantial design margin above the KAS2-12 requirement of 167mA. Operating temperature range matches the original (-40°C to 80°C). Efficiency is improved at 81%. The unit carries CE certification and is manufactured by the same supplier as the original part, ensuring design continuity. However, the input voltage upper limit is reduced to 264 VAC (versus 305 VAC on the original). Package format changes from 5-DIP to 4-DIP, requiring PCB layout verification. Product status is active with current inventory availability.

BAC3S12DC (Murata Power Solutions Inc): This substitute provides 250mA output current and 3W power rating, exceeding the KAS2-12 minimum requirement. The unit supports both AC input (85–264 VAC) and DC input (120–370 VDC), offering extended input flexibility. Operating temperature extends to 85°C. Efficiency is 80%. Certifications include CE and cURus, matching the original. Package format remains 5-DIP, minimizing PCB redesign. Product status is active. The BAC3S12DC is ROHS3 compliant and REACH affected.

TMPS 03-112 (Traco Power): This substitute delivers 250mA output current and 3W power rating, meeting the KAS2-12 current requirement. Input voltage range is 85–264 VAC AC with 120–370 VDC DC capability. Certifications include CB, CE, and cURus. Package format is 5-DIP, maintaining PCB compatibility. Product status is active. Operating temperature range is -25°C to 70°C, which does not extend to the original -40°C lower bound. Efficiency is 77%. This unit is ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can the KAS2-12 be directly replaced with any of these substitutes without PCB modification?

A: Direct replacement depends on package format compatibility. The BAC3S12DC and TMPS 03-112 maintain the 5-DIP module format of the original KAS2-12, allowing pin-for-pin substitution if footprints are identical. The KPSB6-12-E uses a 4-DIP module format, requiring PCB layout verification and potential footprint redesign.

Q: What is the primary difference in input voltage handling between substitutes?

A: The KAS2-12 accepts 90–305 VAC input. The KPSB6-12-E reduces the upper AC limit to 264 VAC. The BAC3S12DC and TMPS 03-112 both support extended input with AC range of 85–264 VAC and DC range of 120–370 VDC, providing universal input capability not present in the original.

Q: Which substitute offers the best thermal performance?

A: The BAC3S12DC extends the operating temperature upper limit to 85°C (versus 80°C on the original). The TMPS 03-112 operates only to 70°C, reducing the upper thermal boundary by 10°C compared to the KAS2-12.

Q: Are all substitutes RoHS compliant?

A: Yes. The KAS2-12 is RoHS Compliant. The KPSB6-12-E is RoHS Compliant. The BAC3S12DC and TMPS 03-112 are both ROHS3 Compliant, representing a higher compliance standard.

Q: Which substitute has the highest efficiency?

A: The KPSB6-12-E achieves 81% efficiency, compared to 73% for the KAS2-12. The BAC3S12DC provides 80% efficiency, and the TMPS 03-112 delivers 77% efficiency.

Q: Do all substitutes carry the same regulatory certifications as the KAS2-12?

A: The KAS2-12 carries CE and cURus certifications. The KPSB6-12-E carries CE certification but not cURus. The BAC3S12DC and TMPS 03-112 both carry CE and cURus certifications, matching the original. The TMPS 03-112 additionally carries CB certification.

Q: What is the current capacity margin provided by each substitute?

A: The KAS2-12 provides 167mA maximum output current. The KPSB6-12-E provides 500mA (3× margin). The BAC3S12DC provides 250mA (1.5× margin). The TMPS 03-112 provides 250mA (1.5× margin).

Q: Can the KAS2-12 be used in applications requiring DC input?

A: No. The KAS2-12 accepts only AC input (90–305 VAC). The BAC3S12DC and TMPS 03-112 both support DC input (120–370 VDC), enabling use in applications with DC power sources.