KAJ04SHGT Equivalent & Substitute Parts

Part Overview

The KAJ04SHGT is a 4-position DIP slide switch manufactured by E-Switch, rated for 25mA at 24VDC with through-hole PC pin termination. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain electrical performance and mechanical compatibility within the specified parameter tolerances.

Key Parameters

Parameter	Value
Circuit Configuration	SPST (Single Pole Single Throw)
Number of Positions	4
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Actuator Level	Flush, Recessed
Contact Material	Copper Alloy with Gold Finish
Mounting Type	Through Hole
Termination Style	PC Pin
Pitch	0.100" (2.54mm)
Mechanical Life	2,000 Cycles
Electrical Life	2,000 Cycles
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the KAJ04SHGT is determined by strict equivalence across the following critical parameters:

Circuit configuration: SPST topology required
Position count: 4-position configuration mandatory
Electrical ratings: 25mA current and 24VDC voltage must be maintained
Actuator type and level: Slide actuator with flush/recessed profile
Contact system: Copper alloy with gold finish
Mounting and termination: Through-hole PC pin configuration with 0.100" pitch
Lifecycle ratings: Minimum 2,000 mechanical and electrical cycles
Compliance: ROHS3 compliance and MSL 1 rating

The NDIR04H and NDIR04HT from APEM Inc. satisfy all mandatory electrical and mechanical parameters. Both parts are active products with current manufacturing status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	KAJ04SHGT (E-Switch)	NDIR04H (APEM Inc.)	NDIR04HT (APEM Inc.)
Circuit Configuration	SPST	SPST	SPST
Number of Positions	4	4	4
Current Rating (Amps)	25mA	25mA	25mA
Voltage Rating	24VDC	24VDC	24VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Flush, Recessed	Flush, Recessed	Flush, Recessed
Contact Material	Copper Alloy	Copper Alloy	Copper Alloy
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)
Mechanical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
Operating Temperature Range	-40°C ~ 85°C	-20°C ~ 85°C	-20°C ~ 85°C
Height Above Board	0.142" (3.60mm)	0.173" (4.40mm)	0.173" (4.40mm)
Length	0.400" (10.16mm)	0.437" (11.10mm)	0.437" (11.10mm)
Body Material	Polyphenylene Sulfide (PPS)	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active
Washable	No	No	Yes

Engineering Selection Recommendations

Both NDIR04H and NDIR04HT are functionally equivalent to the KAJ04SHGT across all critical electrical and mechanical parameters. Selection between the two APEM alternatives depends on application-specific requirements:

NDIR04H is suitable for standard applications where washability is not a requirement. This part maintains full electrical and mechanical compatibility with the original KAJ04SHGT specification.

NDIR04HT includes tape seal and washable features, providing enhanced protection in environments requiring cleaning or moisture exposure. This variant is recommended for applications subject to aqueous cleaning processes or high-humidity conditions.

Both substitute parts are active products with established supply chains, ensuring availability for production and field replacement applications. The minor dimensional variations (height and length) must be evaluated against specific PCB layout constraints, though the 0.100" pitch and through-hole termination remain identical to the original part.

The operating temperature range of the APEM alternatives (-20°C ~ 85°C) is narrower than the KAJ04SHGT (-40°C ~ 85°C). Applications requiring operation below -20°C must retain the original KAJ04SHGT specification or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Are NDIR04H and NDIR04HT direct pin-for-pin replacements for KAJ04SHGT?

A: Both APEM parts maintain identical pitch (0.100"), termination style (PC pin), and through-hole mounting configuration. Electrical and mechanical parameters are equivalent. Minor dimensional differences in height (0.173" vs. 0.142") and length (0.437" vs. 0.400") must be evaluated against specific PCB layout requirements.

Q: What is the difference between NDIR04H and NDIR04HT?

A: NDIR04HT includes tape seal and washable features, making it suitable for applications requiring cleaning or moisture protection. NDIR04H is the standard variant without these features. Both maintain identical electrical ratings and core functionality.

Q: Can these substitutes be used in applications requiring -40°C operation?

A: No. Both APEM alternatives are rated for -20°C minimum operating temperature, compared to -40°C for the KAJ04SHGT. Applications requiring -40°C operation must use the original part or identify alternative solutions with extended temperature ratings.

Q: Are all three parts RoHS3 compliant?

A: Yes. KAJ04SHGT, NDIR04H, and NDIR04HT are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the inventory status of these parts?

A: KAJ04SHGT (obsolete) has 917 units in stock. NDIR04H (active) has 693 units available. NDIR04HT (active) has 1,093 units available. Active product status for the APEM alternatives ensures continued supply availability.

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