FRB2S1525 Equivalent and Substitute Parts

Part Overview

The FRB2S1525 is a glass body reed switch manufactured by Coto Technology, configured as a SPST-NO (Single Pole Single Throw Normally Open) device. This surface mount component operates at 500mA with a 200V switching capability and 10VA rated power. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for continued system support and new design implementations. The MDSR-7-15-25 from Littelfuse Inc. serves as a direct substitute, offering compatible operating characteristics with modern active product status.

Substiute Parts

FRB2S1525

Coto TechnologyIn Stock: 814FRB2S1525 Datasheet

Current PartRFQ

MDSR-7-15-25

Littelfuse Inc.In Stock: 1158MDSR-7-15-25 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MDSR-7-15-25 qualifies as a direct substitute based on the following critical equivalence criteria:

Matching Parameters:

• Circuit configuration: Both devices are SPST-NO
• Operate range: Both operate at 15 ~ 25AT
• DC switching voltage: Both rated at 200V DC
• Operating temperature: Both rated -40°C ~ 125°C
• Capacitance: Both 0.3 pF
• Release time: Both 0.2 ms
• Moisture sensitivity: Both MSL 1
• RoHS compliance: Substitute is ROHS3 Compliant (equivalent to RoHS Compliant)

Critical Difference for Evaluation: The MDSR-7-15-25 reduces AC switching voltage to 140V and switching current to 350mA (AC) / 500mA (DC), with modified mounting (Through Hole instead of Surface Mount). These represent acceptable trade-offs for applications not requiring the full 200V AC specification, provided circuit design accommodates the Through Hole mounting requirement.

Parameter Comparison

Engineering Selection Recommendations

The MDSR-7-15-25 is recommended as the primary substitute for the obsolete FRB2S1525. Selection should be based on the following criteria:

When MDSR-7-15-25 is suitable:

• AC voltage switching requirements are 140V or lower
• AC current switching requirements are 350mA or lower
• DC current carry requirements are 800mA or lower
• Circuit design can accommodate Through Hole mounting in place of Surface Mount
• The 0.1 ms increase in operate time (0.6 ms vs 0.5 ms) is acceptable for the application

When alternative evaluation is required:

• If the original circuit demands 200V AC switching capability
• If AC switching current exceeds 350mA
• If DC carry current exceeds 800mA
• If Surface Mount integration is mandatory and cannot be redesigned

Both parts carry equivalent environmental compliance certifications (RoHS and REACH), supporting use in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the MDSR-7-15-25 be used as a direct pin-for-pin replacement? A: The electrical specifications are compatible (SPST-NO, 15-25AT operate range, 200V DC, 500mA DC), but the mounting technology differs. The original FRB2S1525 is Surface Mount with flat axial termination; the MDSR-7-15-25 is Through Hole with axial leads. PCB redesign is required.

Q: What is the significance of the different power ratings (10VA vs 10W)? A: VA (Volt-Amperes) and W (Watts) reflect different measurement methodologies. For DC applications, they are equivalent. For AC applications, verify that the MDSR-7-15-25's 10W rating meets your circuit's power dissipation requirements at 140V AC, 350mA.

Q: Are there restrictions on using the MDSR-7-15-25 in high-voltage AC applications? A: Yes. The MDSR-7-15-25 has a maximum AC switching voltage of 140V. Applications requiring 200V AC operation must source an alternative part or confirm the circuit operates below 140V AC.

Q: Does the 0.1 ms difference in operate time affect system performance? A: Evaluate this based on application timing requirements. The MDSR-7-15-25 operates 0.1 ms slower (0.6 ms vs 0.5 ms) than the original. In high-speed switching or time-critical circuits, verify this meets performance specifications.

Q: What are the compliance certifications for both parts? A: Both parts are RoHS compliant and REACH unaffected. The FRB2S1525 carries RoHS Compliant status; the MDSR-7-15-25 carries ROHS3 Compliant status, which is the current regulatory standard and supports use in equivalent applications.