Equivalent & Substitute Parts for 9081C-24-00

Part Overview

The Coto Technology 9081C-24-00 is a reed relay with SPDT contact configuration rated for 400 mA at 24VDC coil voltage. This component is classified as obsolete, necessitating identification of active substitute parts for new designs and ongoing production requirements. The relay features through-hole PC pin termination, non-latching coil operation, and operates across the temperature range of -20°C to 85°C. Locating functionally equivalent alternatives ensures design continuity and supply chain reliability.

Substiute Parts

9081C-24-00

Coto TechnologyIn Stock: 8389081C-24-00 Datasheet

Current PartRFQ

HE3321C2400

Littelfuse Inc.In Stock: 7347HE3321C2400 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 9081C-24-00 are identified based on electrical and mechanical compatibility within the reed relay category. The primary substitution criteria are:

Critical Matching Parameters:

• Coil voltage: 24VDC
• Contact form: SPDT (1 Form C)
• Coil type: Non Latching
• Termination style: PC Pin
• Mounting type: Through Hole
• Coil current: 12 mA
• Coil resistance: 2 kOhms
• Must operate voltage: 18 VDC
• Must release voltage: 2 VDC

Allowable Variation Parameters:

• Contact rating current: Substitute parts may have equal or higher current ratings
• Switching voltage: Substitute parts must meet or exceed the maximum switching voltage specification
• Operating temperature range: Substitute parts must encompass or exceed the original operating range
• Product status: Active status preferred for ongoing availability

The HE3321C2400 from Littelfuse Inc. meets all critical matching parameters and represents an active alternative to the obsolete 9081C-24-00.

Parameter Comparison

Engineering Selection Recommendations

The HE3321C2400 from Littelfuse Inc. serves as a direct substitute for the obsolete 9081C-24-00. Selection of this alternative is supported by the following factors:

Compliance and Regulatory Status: Both parts maintain RoHS and REACH compliance, ensuring regulatory alignment for new designs and production environments.

Electrical Equivalence: The substitute part matches all critical electrical parameters including coil voltage, contact form, coil current, and voltage thresholds. The 24VDC coil voltage, SPDT configuration, and 12 mA coil current are identical.

Mechanical Compatibility: Through-hole mounting and PC pin termination are preserved, enabling direct board-level substitution without layout modifications.

Active Product Status: The HE3321C2400 is actively manufactured by Littelfuse Inc., providing assured long-term availability compared to the obsolete 9081C-24-00.

Design Considerations: Applications requiring the full 400 mA contact rating of the original part must evaluate the 250 mA rating of the substitute. Applications with timing-critical requirements must account for the increased operate and release times (3 ms versus 1 ms and 1.5 ms respectively). The extended operating temperature range of the substitute (-40°C to 85°C) provides additional thermal margin.

Frequently Asked Questions (FAQ)

Q: Can the HE3321C2400 directly replace the 9081C-24-00 in existing designs?

A: Direct substitution is possible for applications where the 250 mA contact rating is sufficient. The coil voltage, contact form, termination style, and mounting type are identical. Applications requiring the full 400 mA rating require circuit evaluation.

Q: What is the primary difference between these two relay models?

A: The primary difference is the contact current rating: the 9081C-24-00 is rated for 400 mA, while the HE3321C2400 is rated for 250 mA. Additionally, the HE3321C2400 has longer operate and release times (3 ms each versus 1 ms and 1.5 ms).

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

A: The 9081C-24-00 is supplied with unspecified packaging, while the HE3321C2400 is supplied in tube packaging. Both use PC pin termination and through-hole mounting.

Q: Does the substitute part meet the same regulatory requirements?

A: Both parts are RoHS compliant and REACH unaffected. The substitute carries ROHS3 compliance, which represents a current revision of the RoHS standard.

Q: What is the impact of the different operating temperature ranges?

A: The 9081C-24-00 operates from -20°C to 85°C, while the HE3321C2400 operates from -40°C to 85°C. The substitute provides a wider lower temperature range, offering additional thermal margin for cold environment applications.

Q: Are the coil electrical characteristics identical?

A: Yes. Both parts have 24VDC coil voltage, 12 mA coil current, and 2 kOhms coil resistance. Must operate and must release voltages are also identical at 18 VDC and 2 VDC respectively.

Q: What should be verified before substitution in timing-sensitive applications?

A: Applications where relay switching speed is critical must account for the increased operate time (3 ms versus 1 ms) and release time (3 ms versus 1.5 ms) of the HE3321C2400.