EYP-1BF145 Thermal Cutoff (TCO) Equivalent & Substitute Parts

Part Overview

The EYP-1BF145 is a Thermal Cutoff (TCO) device manufactured by Panasonic Electronic Components, rated for 250VAC/50VDC operation with a functioning temperature of 145°C (293°F). This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing maintenance, repair, and new design applications where equivalent thermal protection is required.

Substiute Parts

EYP-1BF145

Panasonic Electronic ComponentsIn Stock: 1227EYP-1BF145 Datasheet

Current PartRFQ

SDF DF144S

CanthermIn Stock: 4038SDF DF144S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the EYP-1BF145 is determined by the following critical parameters:

• Voltage Rating (AC/DC): Substitute must support minimum 250VAC and 50VDC
• Rated Functioning Temperature: Substitute must operate at or near 145°C (±1°C tolerance acceptable for thermal protection equivalence)
• Holding Temperature: Substitute must maintain thermal stability at or above 125°C
• Package / Case: Substitute must use Axial configuration for mechanical and electrical compatibility
• Approval Certifications: Substitute must maintain compliance with required regulatory standards (UL, cUL, VDE, PSE, CCC)

The SDF DF144S from Cantherm meets these substitution criteria with a functioning temperature of 144°C, which falls within the acceptable thermal operating range for equivalent protection.

Parameter Comparison

Engineering Selection Recommendations

The SDF DF144S serves as a functional equivalent for the obsolete EYP-1BF145 based on the following criteria:

• Thermal Operating Point: The 144°C functioning temperature of the SDF DF144S is within 1°C of the EYP-1BF145 specification, providing equivalent thermal protection characteristics.
• Voltage Compatibility: Both components are rated for 250VAC operation, matching the primary voltage requirement.
• Mechanical Compatibility: Axial package configuration ensures direct form-factor compatibility in existing circuit designs.
• Regulatory Compliance: The SDF DF144S maintains active certifications from UL, cUL, VDE, PSE, and CCC. Applications requiring BEAB or CSA certification should be evaluated separately.
• Availability: The SDF DF144S is actively manufactured with confirmed inventory, addressing the obsolescence of the EYP-1BF145.

Frequently Asked Questions (FAQ)

Q: Can the SDF DF144S directly replace the EYP-1BF145 in all applications?

A: The SDF DF144S is mechanically and thermally compatible for most applications. However, applications requiring BEAB or CSA certification should be reviewed against the SDF DF144S certification profile, which includes CCC, cUL, PSE, UL, and VDE.

Q: What is the significance of the 1°C difference in functioning temperature (145°C vs. 144°C)?

A: A 1°C difference is within normal manufacturing tolerance for thermal cutoff devices and does not affect functional equivalence. Both components provide thermal protection at essentially the same operating point.

Q: Does the SDF DF144S have a DC voltage rating?

A: The SDF DF144S specification provided does not include a DC voltage rating. For applications requiring DC operation, the 50VDC rating of the EYP-1BF145 should be confirmed with the manufacturer before substitution.

Q: Why is the holding temperature of the SDF DF144S lower (120°C vs. 125°C)?

A: The 5°C difference in holding temperature reflects design variations between manufacturers. The SDF DF144S will maintain thermal stability at 120°C, which is acceptable for most thermal protection applications. Applications with specific holding temperature requirements should be evaluated against actual circuit operating conditions.

Q: Is the Axial package configuration the same between both parts?

A: Yes, both the EYP-1BF145 and SDF DF144S use Axial package configuration, ensuring mechanical and electrical compatibility in circuit board layouts and component mounting.

Q: What certifications are most critical for my application?

A: Certification requirements depend on the end-use application and regional regulations. The SDF DF144S maintains UL, cUL, VDE, PSE, and CCC certifications. If BEAB or CSA certification is mandatory, alternative substitutes should be evaluated or the application should be reviewed for certification necessity.