KB25CKG01-5F-JB Equivalent & Substitute Parts

Part Overview

The KB25CKG01-5F-JB is a pushbutton switch manufactured by NKK Switches, featuring DPDT (Double Pole Double Throw) circuitry with illuminated panel mount design. This component operates at 28V AC/DC with a 0.4VA current rating and green LED illumination. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where this series is no longer available.

Key Parameters

Parameter	Value
Manufacturer	NKK Switches
Circuit Configuration	DPDT
Switch Function	On-Mom (Momentary)
Current Rating	0.4VA (AC/DC)
Voltage Rating	28V AC / 28V DC
Mounting Type	Panel Mount, Front
Actuator Type	Round Button
Illumination	LED, Green
Operating Temperature Range	-25°C to 50°C
Mechanical Life	100,000 Cycles
Electrical Life	100,000 Cycles
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The YB25CKG01-5F-JB qualifies as a functional substitute based on the following critical parameters:

Matching Parameters:

DPDT circuit configuration
On-Mom switch function
0.4VA current rating (AC/DC)
28V AC and 28V DC voltage ratings
Panel mount, front installation
Round button actuator
Green LED illumination
Operating temperature range (-25°C to 50°C)
Electrical life rating (100,000 cycles)
RoHS3 compliance
Moisture Sensitivity Level 1 (Unlimited)

Differing Parameters:

Panel cutout diameter: KB25CKG01-5F-JB uses 12.30mm; YB25CKG01-5F-JB uses 16.00mm
Illumination voltage: KB25CKG01-5F-JB requires 2.1VDC; YB25CKG01-5F-JB requires 2VDC
Mechanical life: KB25CKG01-5F-JB rated for 100,000 cycles; YB25CKG01-5F-JB rated for 1,000,000 cycles
Termination style: KB25CKG01-5F-JB uses solder lug; YB25CKG01-5F-JB uses solder with quick connect 0.110" (2.8mm)
Product status: KB25CKG01-5F-JB is obsolete; YB25CKG01-5F-JB is active

Parameter Comparison

Parameter	KB25CKG01-5F-JB (Main)	YB25CKG01-5F-JB (Substitute)
Manufacturer	NKK Switches	NKK Switches
Series	KB	YB
Product Status	Obsolete	Active
Circuit	DPDT	DPDT
Switch Function	On-Mom	On-Mom
Current Rating	0.4VA (AC/DC)	0.4VA (AC/DC)
Voltage Rating - AC	28V	28V
Voltage Rating - DC	28V	28V
Mounting Type	Panel Mount, Front	Panel Mount, Front
Actuator Type	Round Button	Round Button
Illumination Type, Color	LED, Green	LED, Green
Illumination Voltage (Nominal)	2.1VDC	2VDC
Panel Cutout Dimensions	Circular - 12.30mm Dia	Circular - 16.00mm Dia
Operating Temperature	-25°C to 50°C	-25°C to 50°C
Mechanical Life	100,000 Cycles	1,000,000 Cycles
Electrical Life	100,000 Cycles	100,000 Cycles
Termination Style	Solder Lug	Solder, Quick Connect - 0.110" (2.8mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The YB25CKG01-5F-JB is an active product from NKK Switches and represents the current equivalent to the obsolete KB25CKG01-5F-JB. Both components maintain identical electrical specifications (DPDT, 0.4VA, 28V AC/DC, green LED) and operational parameters (temperature range, electrical life).

Selection of the YB25CKG01-5F-JB offers the following advantages: active product status ensures ongoing availability and supply chain reliability, enhanced mechanical life rating (1,000,000 cycles versus 100,000 cycles), and improved termination flexibility with quick connect options. Both parts maintain full RoHS3 compliance and unlimited moisture sensitivity classification.

Implementation of the YB25CKG01-5F-JB requires accommodation of two design modifications: panel cutout diameter increases from 12.30mm to 16.00mm, and termination transitions from solder lug to solder with 0.110" (2.8mm) quick connect. Illumination voltage tolerance adjustment from 2.1VDC to 2VDC is within standard LED operating margins.

Frequently Asked Questions (FAQ)

Q: Can the YB25CKG01-5F-JB directly replace the KB25CKG01-5F-JB without circuit modifications?

A: Electrical substitution is valid. The YB25CKG01-5F-JB maintains identical DPDT circuitry, voltage ratings (28V AC/DC), current capacity (0.4VA), and illumination color (green LED). However, mechanical integration requires panel cutout modification (12.30mm to 16.00mm diameter) and termination style change (solder lug to quick connect 0.110").

Q: What is the impact of the panel cutout diameter difference?

A: The YB25CKG01-5F-JB requires a larger circular panel opening (16.00mm versus 12.30mm). Existing panel assemblies designed for the KB25CKG01-5F-JB will require mechanical modification or replacement to accommodate the larger diameter.

Q: Are the illumination voltage specifications compatible?

A: The KB25CKG01-5F-JB specifies 2.1VDC nominal illumination voltage, while the YB25CKG01-5F-JB specifies 2VDC. This 0.1VDC difference falls within standard LED operating tolerances and does not require circuit redesign.

Q: What are the termination differences between these parts?

A: The KB25CKG01-5F-JB uses solder lug termination for direct PCB soldering. The YB25CKG01-5F-JB combines solder termination with quick connect 0.110" (2.8mm) capability, providing connection flexibility. Existing solder connections require modification to accommodate the quick connect option.

Q: Does the mechanical life rating difference affect substitution validity?

A: The YB25CKG01-5F-JB provides superior mechanical life (1,000,000 cycles versus 100,000 cycles). This represents an enhancement rather than a limitation and does not prevent substitution. Applications requiring the original 100,000-cycle specification remain compatible.

Q: Are both parts RoHS compliant?

A: Yes. Both the KB25CKG01-5F-JB and YB25CKG01-5F-JB maintain ROHS3 compliance and are classified as Moisture Sensitivity Level 1 (Unlimited).

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