Equivalent & Substitute Parts: UM2378

Part Overview

The UM2378 is a Glass Body Reed Switch manufactured by Coto Technology, configured as a Single Pole Single Throw Normally Open (SPST-NO) device. This component operates at 250mA switching current with a maximum switching voltage of 175V, rated for 5VA power dissipation. The UM2378 is classified as Obsolete, necessitating the identification and evaluation of functionally equivalent substitute components to maintain design continuity and ensure availability for production and repair applications.

Substiute Parts

UM2378

Coto TechnologyIn Stock: 764UM2378 Datasheet

Current PartRFQ

CT05-3050-G1

Coto TechnologyIn Stock: 1105CT05-3050-G1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The CT05-3050-G1 is identified as a functional substitute for the UM2378 based on alignment of critical electrical and mechanical parameters. Substitution eligibility is determined by the following key parameters:

Critical Substitution Criteria:

• Circuit Configuration: Both components are SPST-NO configuration
• Mounting Type: Both are Surface Mount devices
• Termination Style: Both utilize Gull Wing termination
• Operating Temperature Range: Both support -40°C ~ 125°C
• RoHS and REACH Compliance: Both meet current regulatory standards
• Current Carry Capacity: Both rated at 500mA (AC/DC)
• Moisture Sensitivity Level: Both rated MSL 1 (Unlimited)

Parameter Compatibility Notes: The CT05-3050-G1 operates at a lower maximum switching voltage (100V AC / 140V DC) compared to the UM2378 (175V), and has a higher operate range (30 ~ 50AT vs. 20 ~ 25AT). The substitute supports higher switching current capacity in DC mode (350mA DC vs. 250mA), and higher rated power (5W vs. 5VA).

Parameter Comparison

Engineering Selection Recommendations

UM2378 Status: Classified as Obsolete. Component selection should transition to the CT05-3050-G1 for new designs and ongoing production requirements.

CT05-3050-G1 Advantages: Active product status ensures continued manufacturing availability and supply chain reliability. ROHS3 compliance demonstrates adherence to current regulatory standards. Molded body construction provides enhanced mechanical robustness compared to the glass body design of the UM2378.

Application Scope Verification: The CT05-3050-G1 is suitable for applications where switching voltages do not exceed 100V AC or 140V DC. For applications requiring the full 175V switching voltage capability of the UM2378, alternative substitutes meeting that voltage specification must be evaluated.

Compliance Status: Both components maintain REACH Unaffected status and possess unlimited moisture sensitivity levels (MSL 1), supporting deployment across standard industrial and commercial operating environments.

Frequently Asked Questions (FAQ)

Q: Can CT05-3050-G1 directly replace UM2378 in all applications?

A: Direct substitution is applicable only when circuit design parameters do not require the maximum 175V switching voltage of the UM2378. Applications operating at voltages of 100V AC or below, and 140V DC or below, are compatible with CT05-3050-G1. Applications exceeding these voltage thresholds require alternative substitute components.

Q: What are the physical differences between these components?

A: The UM2378 (Glass Body Reed) has an overall length of 0.400" (10.16mm) with a body size of 0.232" L x 0.076" W x 0.060" H. The CT05-3050-G1 (Molded Body Reed) has an overall length of 0.376" (9.55mm) with a body size of 0.252" L x 0.091" W x 0.091" H. Both maintain identical Gull Wing termination style and Surface Mount configuration, supporting drop-in replacement in PCB layouts designed for similar body dimensions.

Q: How do the electrical performance characteristics compare?

A: Both components maintain identical AC switching current capacity (250mA) and identical operating temperature ranges (-40°C ~ 125°C). The CT05-3050-G1 provides higher DC switching current capacity (350mA DC vs. 250mA) and higher rated power (5W vs. 5VA). The UM2378 supports higher maximum switching voltages (175V vs. 100V AC / 140V DC).

Q: What is the impact of operate and release time specifications?

A: Operate time (0.4 ms) and release time (0.1 ms) are specified for the UM2378 but not provided for the CT05-3050-G1 in available documentation. For applications with critical timing requirements dependent on these parameters, contact the manufacturer for complete timing specifications of the substitute component.

Q: Are both components available for production quantities?

A: The UM2378 is classified as Obsolete with limited inventory (681 units). The CT05-3050-G1 is Active with production availability (1035 units in stock). For ongoing production requirements, CT05-3050-G1 is the preferred selection to ensure sustained supply chain access.

Q: What packaging options are available?

A: The CT05-3050-G1 is supplied in Tape & Reel (TR) packaging, supporting automated assembly operations. Packaging specification for UM2378 is not provided in technical documentation.