FRB2249 Equivalent & Substitute Parts

Part Overview

The FRB2249 is a glass body reed switch manufactured by Coto Technology, configured as a single-pole single-throw normally-open (SPST-NO) device. This component is designed for low-current switching applications with a maximum switching current of 500mA and voltage rating of 200V (both AC and DC). The product status is listed as obsolete, making the identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

FRB2249

Coto TechnologyIn Stock: 919FRB2249 Datasheet

Current PartRFQ

MDCG-4-12-33

Littelfuse Inc.In Stock: 2316MDCG-4-12-33 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FRB2249 with alternative components is determined by electrical compatibility and functional equivalence across the following key parameters:

Electrical Parameters: Circuit configuration (SPST-NO), switching current rating (500mA AC/DC minimum), voltage rating (200V AC/DC minimum), and power rating (10VA or greater).

Mechanical Parameters: Glass body reed switch construction and compatible mounting options (surface mount or through-hole designs may be acceptable depending on PCB layout requirements).

Compliance & Reliability: RoHS3 compliance, temperature range (-40°C to 125°C), and MSL rating (Level 1 - Unlimited).

The MDCG-4-12-33 from Littelfuse Inc. meets these substitution criteria within the allowed parameter tolerances for this product category.

Parameter Comparison

Engineering Selection Recommendations

The MDCG-4-12-33 serves as an active-status alternative to the obsolete FRB2249. Both components maintain ROHS3 compliance and identical operating temperature ranges, ensuring environmental regulatory alignment and thermal compatibility.

DC Applications: The MDCG-4-12-33 is fully equivalent for DC switching at 500mA and 200V, matching the original FRB2249 specifications exactly.

AC Applications: The MDCG-4-12-33 has a reduced AC current rating of 350mA compared to the FRB2249's 500mA, and reduced AC voltage rating of 140V compared to 200V. Design verification is necessary to confirm these parameters are acceptable for existing AC applications.

Packaging Consideration: The FRB2249 uses surface mount termination (gull wing), while the MDCG-4-12-33 uses through-hole axial termination. PCB design modifications may be required to accommodate the different mounting style.

Frequently Asked Questions (FAQ)

Q: Can the MDCG-4-12-33 directly replace the FRB2249 in all applications?

A: Substitution is valid for DC applications at 500mA/200V and temperature ranges of -40°C to 125°C. AC applications require design review due to lower AC voltage (140V vs. 200V) and current (350mA vs. 500mA) ratings on the substitute part. PCB layout must accommodate the change from surface mount to through-hole mounting.

Q: What is the difference between operate range (AT) specifications?

A: Operate range is measured in ampere-turns (AT) of the magnetic actuating force. The FRB2249 operates between 15 ~ 25AT, while the MDCG-4-12-33 operates between 12 ~ 33AT. The broader range of the MDCG-4-12-33 provides design flexibility but may require actuation force verification in the specific application.

Q: Are both parts equally available?

A: The FRB2249 is obsolete with limited inventory (892 pcs). The MDCG-4-12-33 is active production status with significantly higher availability (2260 pcs). For new designs or ongoing production, the MDCG-4-12-33 is the recommended choice.

Q: What are the compliance implications?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry ECCN EAR99 classification, meeting equivalent regulatory requirements for electrical and environmental standards.