KAJ12LGGT DIP Switch Equivalent & Substitute Parts

Part Overview

The KAJ12LGGT is a 12-position surface mount DIP switch manufactured by E-Switch, designed for SPST (Single Pole Single Throw) switching applications at 25mA and 24VDC. This component features a slide actuator with gold-plated copper alloy contacts and is housed in a polyphenylene sulfide (PPS) body with gull wing termination for surface mount assembly.

The KAJ12LGGT is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value
Circuit Configuration	SPST
Number of Positions	12
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Mounting Type	Surface Mount
Termination Style	Gull Wing
Pitch	0.100" (2.54mm)
Contact Material	Copper Alloy
Contact Finish	Gold
Body Material	Polyphenylene Sulfide (PPS)
Operating Temperature Range	-40°C ~ 85°C
Mechanical Life	2,000 Cycles
Electrical Life	2,000 Cycles
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the KAJ12LGGT is determined by strict alignment with the following core electrical and mechanical parameters:

Critical Parameters for Substitution:

Circuit configuration: SPST
Number of positions: 12
Current rating: 25mA minimum
Voltage rating: 24VDC minimum
Actuator type: Slide (Standard)
Mounting type: Surface Mount
Termination style: Gull Wing
Pitch: 0.100" (2.54mm)

Identified Substitutes:

DM12 (APEM Inc.) qualifies as a direct substitute. This part maintains identical electrical specifications (SPST, 12 positions, 25mA, 24VDC) and mechanical configuration (slide actuator, surface mount, gull wing termination, 0.100" pitch). The DM12 is currently in active production status with equivalent RoHS3 compliance. Minor dimensional variations exist (height 0.173" vs. 0.163", length 1.237" vs. 1.200"), which remain within acceptable tolerances for standard DIP switch applications.

SD12H0SB (C&K) qualifies as a substitute with enhanced electrical performance. This part exceeds the minimum specifications with 100mA current rating and 25VDC voltage rating, providing design margin above the KAJ12LGGT requirements. It maintains the same circuit configuration (SPST), position count (12), actuator type (slide), mounting method (surface mount), and pitch (0.100"). The SD12H0SB features beryllium copper contacts and includes tape seal washability, offering additional robustness. Dimensional differences are minor and acceptable for standard applications.

Parameter Comparison

Parameter	KAJ12LGGT (E-Switch)	DM12 (APEM Inc.)	SD12H0SB (C&K)
Circuit Configuration	SPST	SPST	SPST
Number of Positions	12	12	12
Current Rating (Amps)	25mA	25mA	100mA
Voltage Rating	24VDC	24VDC	25VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Actuator Level	Raised	Raised	Flush, Recessed
Contact Material	Copper Alloy	Copper Alloy	Beryllium Copper
Contact Finish	Gold	Gold	Gold
Height Above Board	0.163" (4.15mm)	0.173" (4.40mm)	0.170" (4.33mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Termination Style	Gull Wing	Gull Wing	Gull Wing
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Length	1.200" (30.48mm)	1.237" (31.42mm)	1.258" (31.95mm)
Body Material	Polyphenylene Sulfide (PPS)	Polyphenylene Sulfide (PPS), Glass Filled	Polyphthalamide (PPA)
Operating Temperature Range	-40°C ~ 85°C	-20°C ~ 85°C	-40°C ~ 85°C
Mechanical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles
Washable	No	No	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

DM12 Selection Criteria: The DM12 from APEM Inc. is recommended for direct replacement applications where the KAJ12LGGT is no longer available. This part maintains electrical parity (25mA, 24VDC) and identical mechanical configuration. The DM12 is in active production status, ensuring long-term supply chain availability. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) match the original specification. The minor height and length variations do not impact standard DIP switch mounting or circuit board layout compatibility.

SD12H0SB Selection Criteria: The SD12H0SB from C&K is recommended for applications requiring enhanced electrical performance or environmental robustness. The 100mA current rating and 25VDC voltage rating provide design margin above the original 25mA/24VDC specification. The washable design with tape seal offers superior protection in manufacturing environments requiring aqueous cleaning processes. The beryllium copper contact material provides improved electrical performance and contact reliability. This part is suitable for designs where the additional performance characteristics justify any minor dimensional or material differences. ROHS3 compliance and unlimited MSL rating maintain regulatory alignment.

Both substitute parts carry active production status, ensuring availability for new designs and ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can the DM12 be used as a direct replacement for the KAJ12LGGT in existing designs?

A: Yes. The DM12 maintains identical electrical specifications (SPST, 12 positions, 25mA, 24VDC) and mechanical configuration (slide actuator, surface mount, gull wing termination, 0.100" pitch). Minor dimensional variations (height and length) are within acceptable tolerances for standard DIP switch applications and do not require circuit board redesign.

Q: What is the primary advantage of the SD12H0SB over the DM12?

A: The SD12H0SB provides enhanced electrical performance with 100mA current rating and 25VDC voltage rating, compared to the DM12's 25mA and 24VDC. Additionally, the SD12H0SB features washable design with tape seal, beryllium copper contacts, and operates across the full -40°C to 85°C temperature range. These characteristics make it suitable for applications requiring higher reliability or environmental robustness.

Q: Are there any compatibility concerns with the different body materials?

A: The KAJ12LGGT uses polyphenylene sulfide (PPS), while the DM12 uses glass-filled PPS, and the SD12H0SB uses polyphthalamide (PPA). All three materials are suitable for surface mount DIP switch applications and maintain equivalent mechanical and thermal performance within the specified operating temperature ranges. Material selection does not impact electrical functionality or standard PCB assembly processes.

Q: Do all three parts meet the same regulatory compliance standards?

A: Yes. The KAJ12LGGT, DM12, and SD12H0SB are all ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and REACH unaffected status. All parts carry EAR99 ECCN classification and identical HTSUS codes (8536.50.9065).

Q: What is the significance of the DM12 being in active production while the KAJ12LGGT is obsolete?

A: Active production status for the DM12 ensures long-term supply chain availability, consistent manufacturing quality, and support for both new designs and ongoing production of systems using the KAJ12LGGT. The obsolete status of the KAJ12LGGT indicates that E-Switch no longer manufactures this part, making the DM12 the preferred substitute for continuity.

Q: Can the SD12H0SB be used in applications originally designed for the KAJ12LGGT?

A: Yes. The SD12H0SB exceeds the electrical requirements of the KAJ12LGGT (100mA vs. 25mA, 25VDC vs. 24VDC) and maintains the same circuit configuration, position count, and mechanical interface. The enhanced specifications provide design margin and improved reliability. Minor dimensional differences do not impact standard mounting or layout compatibility.

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