KAJ02TAGT Equivalent & Substitute Parts

Part Overview

The KAJ02TAGT is a DIP slide switch manufactured by E-Switch, configured as a single-pole single-throw (SPST) device with 2 positions. This component is rated for 25mA at 24VDC and features a through-hole mounting design with flush, recessed slide actuator. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

KAJ02TAGT

E-SwitchIn Stock: 996KAJ02TAGT Datasheet

Current PartRFQ

209-2LPST

CTS ElectrocomponentsIn Stock: 4450209-2LPST Datasheet

MFR RecommendedRFQ

SD02H0B

C&KIn Stock: 5391SD02H0B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KAJ02TAGT is determined by the following critical parameters:

• Circuit Configuration: Must be SPST with 2 positions
• Mounting Interface: Through-hole with 0.100" (2.54mm) pitch and PC pin termination
• Actuator Mechanism: Slide actuator with flush, recessed actuation level
• Electrical Performance: Current rating must meet or exceed 25mA; voltage rating must meet or exceed 24VDC
• Environmental Compliance: ROHS3 compliance and MSL 1 rating required
• Operating Temperature: Must support -40°C to 85°C range

Both identified substitute parts meet these criteria. The 209-2LPST (CTS Electrocomponents) provides 100mA at 20VDC, while the SD02H0B (C&K) provides 100mA at 25VDC. Both exceed the original current specification and maintain compatible mechanical and electrical interfaces.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are classified as active products with current manufacturing support, addressing the obsolescence status of the KAJ02TAGT. Selection between the two alternatives depends on voltage margin requirements:

The SD02H0B (C&K) is the preferred substitute when the 24VDC specification must be maintained with margin, as it is rated for 25VDC. This part provides a direct voltage alignment with the original component while delivering four times the current capacity (100mA versus 25mA).

The 209-2LPST (CTS Electrocomponents) is suitable for applications where the system voltage does not exceed 20VDC. This part also provides 100mA current capacity and maintains full mechanical and environmental compatibility.

Both alternatives comply with ROHS3 and REACH requirements, carry MSL 1 rating, and support the full -40°C to 85°C operating temperature range. Mechanical footprint differences exist: the substitute parts measure 0.180" and 0.178" above the board respectively, compared to 0.142" for the original. PCB layout clearance must be verified during design transition.

Frequently Asked Questions (FAQ)

Q: Can the 209-2LPST be used in a 24VDC circuit? A: No. The 209-2LPST is rated for 20VDC maximum. Using this part in a 24VDC application exceeds its voltage specification and is not permitted.

Q: Is the SD02H0B a direct replacement for the KAJ02TAGT? A: The SD02H0B is functionally equivalent in circuit configuration, mounting interface, and environmental compliance. The primary difference is increased height above board (0.178" versus 0.142"), which must be verified against PCB clearance requirements. Electrical performance exceeds the original specification.

Q: Why do the substitute parts have higher current ratings? A: The substitute parts are rated for 100mA, compared to the original 25mA specification. This higher rating does not affect compatibility; the circuit will operate at the original 25mA current draw. The higher rating provides design margin and component availability from active manufacturers.

Q: Are there mechanical compatibility concerns? A: Both substitute parts maintain the 0.100" (2.54mm) pitch and PC pin termination of the original. The increased height above board (approximately 0.036" to 0.038" higher) must be evaluated for PCB layout and enclosure clearance.

Q: Do the substitute parts meet the same environmental standards? A: Yes. Both the 209-2LPST and SD02H0B are ROHS3 compliant, REACH unaffected, carry MSL 1 rating, and support the -40°C to 85°C operating temperature range identical to the KAJ02TAGT.

Q: What is the difference between Beryllium Copper and Copper Alloy contacts? A: Both contact materials are gold-finished and suitable for low-voltage switching applications. Beryllium Copper, used in the substitute parts, provides enhanced spring characteristics and contact reliability. This represents an improvement over the original Copper Alloy contacts.