FLEX-14-30-35 Glass Body Reed Switch Equivalent & Substitute Parts

Part Overview

The FLEX-14-30-35 is a glass body reed switch manufactured by Littelfuse Inc., configured as a single-pole single-throw normally open (SPST-NO) device. This through-hole component is rated for 350mA AC / 500mA DC switching at 140V AC and 200V DC, with a 10W power rating. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when component availability changes, supply chain disruptions occur, or design revisions require compatible alternatives that maintain functional equivalence within specified electrical and mechanical tolerances.

Substiute Parts

FLEX-14-30-35

Littelfuse Inc.In Stock: 2063FLEX-14-30-35 Datasheet

Current PartRFQ

KSK-1A66/3-2030

Standex-Meder ElectronicsIn Stock: 1307KSK-1A66/3-2030 Datasheet

MFR RecommendedRFQ

SW GP560/10-15 AT

Standex-Meder ElectronicsIn Stock: 3413SW GP560/10-15 AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FLEX-14-30-35 is determined by the following critical parameters:

Circuit Configuration: All substitutes must maintain SPST-NO topology to ensure functional compatibility in existing circuit designs.

Mounting and Termination: Through-hole axial termination is required for direct PCB compatibility without layout modifications.

Electrical Ratings: Substitute parts must meet or exceed the switching current and voltage specifications of the main part. The FLEX-14-30-35 requires minimum 350mA AC / 500mA DC switching capability and 140V AC / 200V DC voltage withstand.

Power Rating: A 10W minimum power rating is required to maintain thermal and electrical performance equivalence.

Operating Temperature: The -40°C ~ 125°C range establishes the minimum environmental specification for substitutes.

Compliance: RoHS3 compliance and MSL 1 rating are mandatory for supply chain and manufacturing process compatibility.

Two substitute parts meet these criteria with varying degrees of parameter alignment:

KSK-1A66/3-2030 (Standex-Meder Electronics): Exceeds switching current specification (500mA AC/DC vs. 350mA AC / 500mA DC) and voltage rating (200V AC/DC vs. 140V AC / 200V DC). Operates range differs (20 ~ 30AT vs. 30 ~ 35AT). Meets all compliance and mounting requirements.

SW GP560/10-15 AT (Standex-Meder Electronics): Exceeds switching current specification (1A AC/DC vs. 350mA AC / 500mA DC). Voltage rating is lower (125V AC / 100V DC vs. 140V AC / 200V DC). Operate range is broader (10 ~ 50AT vs. 30 ~ 35AT). Overall length differs (2.126" vs. 1.744"). Meets all compliance and mounting requirements.

Parameter Comparison

Engineering Selection Recommendations

KSK-1A66/3-2030 is the preferred substitute when direct form-factor compatibility is required. This part maintains identical overall length (1.744") and body diameter (0.087" vs. 0.090"), enabling direct PCB footprint compatibility. Electrical specifications exceed the FLEX-14-30-35 in both switching current (500mA AC/DC) and voltage rating (200V AC/DC). The operate range (20 ~ 30AT) is lower than the main part but remains within acceptable substitution tolerance. Both parts carry active product status, RoHS3 compliance, and MSL 1 rating.

SW GP560/10-15 AT is suitable for applications where increased switching current capacity (1A AC/DC) is beneficial and PCB layout modifications are acceptable. The overall length is 2.126" (54.00mm), requiring verification of available board space. AC voltage rating (125V) is lower than the main part specification; DC voltage rating (100V) is also reduced. This part is appropriate only for applications operating below these voltage thresholds. Active product status and full compliance certifications are maintained.

Both substitutes are active production parts with RoHS3 compliance and unlimited moisture sensitivity rating, ensuring supply chain stability and manufacturing process compatibility with the original FLEX-14-30-35.

Frequently Asked Questions (FAQ)

Q: Can KSK-1A66/3-2030 be used as a direct replacement for FLEX-14-30-35 without PCB modifications?

A: Yes. The KSK-1A66/3-2030 maintains identical overall length (1.744") and similar body diameter (0.087" vs. 0.090"), enabling direct footprint compatibility. Both parts use through-hole axial termination and SPST-NO configuration.

Q: What is the primary difference between the two substitute parts?

A: KSK-1A66/3-2030 maintains form-factor compatibility with identical length and similar body dimensions. SW GP560/10-15 AT offers higher switching current capacity (1A vs. 500mA) but requires 0.382" additional board length (2.126" vs. 1.744") and has lower AC voltage rating (125V vs. 140V).

Q: Is SW GP560/10-15 AT suitable for 140V AC applications?

A: No. The SW GP560/10-15 AT is rated for 125V AC maximum. Applications requiring 140V AC operation must use FLEX-14-30-35 or KSK-1A66/3-2030.

Q: Do all three parts share the same compliance certifications?

A: Yes. FLEX-14-30-35, KSK-1A66/3-2030, and SW GP560/10-15 AT are all RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating and REACH unaffected status.

Q: What is the operate range specification, and how does it affect substitution?

A: Operate range specifies the magnetic field strength (in Ampere-Turns, AT) required to close the reed switch contacts. FLEX-14-30-35 requires 30 ~ 35AT. KSK-1A66/3-2030 operates at 20 ~ 30AT (lower threshold), and SW GP560/10-15 AT operates at 10 ~ 50AT (broader range). Lower operate range thresholds may cause unintended switching in magnetically sensitive environments.

Q: Are there packaging differences between the main part and substitutes?

A: FLEX-14-30-35 is supplied in box packaging. Both KSK-1A66/3-2030 and SW GP560/10-15 AT are supplied in bulk packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Can these parts be used interchangeably in existing designs?

A: KSK-1A66/3-2030 is directly interchangeable without design changes. SW GP560/10-15 AT requires PCB layout verification due to increased length and lower voltage ratings. Electrical specification review is mandatory before substitution.