KAJ09TAGT Equivalent & Substitute Parts

Part Overview

The KAJ09TAGT is a 9-position DIP slide switch manufactured by E-Switch, rated for 25mA at 24VDC with SPST (Single Pole Single Throw) configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The switch features through-hole mounting with PC pin termination, gold-plated copper alloy contacts, and operates across -40°C to 85°C. Active substitute options are available from manufacturers including CTS Electrocomponents and C&K.

Key Parameters

Parameter	KAJ09TAGT
Circuit Configuration	SPST
Number of Positions	9
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Termination Style	PC Pin
Pitch	0.100" (2.54mm)
Operating Temperature Range	-40°C to 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the KAJ09TAGT is determined by the following critical parameters:

Circuit configuration must remain SPST
Number of positions must be 9
Mounting type must be through hole with PC pin termination
Pitch must be 0.100" (2.54mm)
Operating temperature range must encompass -40°C to 85°C
RoHS3 compliance required

The identified substitutes meet these core requirements. Current rating and voltage rating tolerances allow for higher specifications in substitute parts, as components rated for higher electrical parameters can safely operate at lower specifications of the original design. Both substitute parts maintain the same actuator type (slide standard), contact finish (gold), and washable design characteristics.

Parameter Comparison

Parameter	KAJ09TAGT (E-Switch)	209-9LPST (CTS)	SD09H0B (C&K)
Manufacturer Part Number	KAJ09TAGT	209-9LPST	SD09H0B
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	9	9	9
Current Rating	25mA	100mA	100mA
Voltage Rating	24VDC	20VDC	25VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Flush, Recessed	Flush, Recessed	Flush, Recessed
Contact Finish	Gold	Gold	Gold
Mounting Type	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Washable	Yes	Yes	Yes
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both 209-9LPST and SD09H0B are active production components suitable for replacing the obsolete KAJ09TAGT. Selection between these two substitutes depends on voltage specification requirements:

The 209-9LPST (CTS Electrocomponents) is rated for 20VDC and carries ROHS3 compliance with 100mA current capacity. This part is appropriate for applications where the system voltage does not exceed 20VDC.

The SD09H0B (C&K) is rated for 25VDC and carries ROHS3 compliance with 100mA current capacity. This part maintains voltage parity with the original KAJ09TAGT specification and is appropriate for applications operating at or near 24VDC nominal voltage.

Both substitutes exceed the original 25mA current rating at 100mA, providing design margin for the electrical load. Both maintain identical mechanical specifications, pitch, and mounting configuration, ensuring direct PCB compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 209-9LPST be used in a 24VDC application?

A: The 209-9LPST is rated for 20VDC maximum. Operating this component at 24VDC exceeds its voltage specification and is not recommended for production designs.

Q: Can the SD09H0B be used as a direct replacement for the KAJ09TAGT?

A: Yes. The SD09H0B maintains identical circuit configuration (SPST), position count (9), mounting type (through hole), pitch (0.100"), and operating temperature range (-40°C to 85°C). The voltage rating (25VDC) matches the original specification, and the current rating (100mA) exceeds the original requirement (25mA).

Q: Are there physical dimension differences between these parts?

A: Minor height variations exist. The KAJ09TAGT has a height above board of 0.142" (3.60mm), while both substitutes measure approximately 0.178-0.180" (4.52-4.57mm). Length specifications differ slightly: KAJ09TAGT is 0.900" (22.86mm) versus 0.958" (24.33mm) for both substitutes. These differences may affect clearance in space-constrained applications.

Q: Do all three parts share the same pitch and termination?

A: Yes. All three parts feature 0.100" (2.54mm) pitch with PC pin termination, ensuring identical footprint compatibility on PCBs designed for the KAJ09TAGT.

Q: What is the difference in contact material between these parts?

A: The KAJ09TAGT uses copper alloy contacts, while both substitutes use beryllium copper contacts. Both materials are gold-plated and suitable for the specified electrical parameters.

Q: Are all parts RoHS3 compliant?

A: Yes. The KAJ09TAGT, 209-9LPST, and SD09H0B are all ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level).

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