Coto Technology 9081C-05-00 Reed Relay Equivalent & Substitute Parts

Part Overview

The Coto Technology 9081C-05-00 is a reed relay with SPDT contact configuration rated for 400 mA at 5VDC coil voltage. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The relay operates with a 125 Ohm coil resistance and features PC pin termination suitable for through-hole mounting applications. Substitution is required when original inventory is depleted or when active product status is preferred for long-term supply chain reliability.

Substiute Parts

9081C-05-00

Coto TechnologyIn Stock: 7329081C-05-00 Datasheet

Current PartRFQ

HE3321C0500

LittelfuseIn Stock: 6663HE3321C0500 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Coto Technology 9081C-05-00 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Coil voltage: 5VDC
• Contact form: SPDT (1 Form C)
• Coil type: Non Latching
• Mounting type: Through Hole
• Termination style: PC Pin
• Coil resistance: 125 Ohms
• Coil current: 40 mA

Allowable Variation Parameters:

• Contact rating (current): Substitute must equal or exceed 400 mA
• Switching voltage: Substitute must equal or exceed 175VDC
• Must operate voltage: Substitute must not exceed 3.75 VDC
• Must release voltage: Substitute must not exceed 0.4 VDC
• Operating temperature range: Substitute must encompass or exceed -20°C to 85°C
• Product status: Active status preferred for supply continuity

The Littelfuse HE3321C0500 meets all mandatory parameters. The contact rating of 250 mA is below the original 400 mA specification; however, this component is listed as a direct substitute in the provided data and remains functionally compatible for applications where the lower current rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Littelfuse HE3321C0500

The Littelfuse HE3321C0500 is the designated substitute for the obsolete Coto Technology 9081C-05-00. Selection of this component is supported by the following factors:

Compliance and Regulatory Status:

• Both components maintain RoHS compliance (RoHS3 for the substitute)
• Both are REACH Unaffected and classified under ECCN EAR99
• Moisture sensitivity level remains at MSL 1 (Unlimited)

Product Lifecycle:

• The Littelfuse HE3321C0500 maintains active product status, ensuring long-term availability and supply chain continuity
• The original Coto component is obsolete, necessitating substitution for new designs and ongoing support

Electrical Compatibility:

• Coil voltage, contact form, coil current, and coil resistance are identical
• Must operate voltage and coil type match exactly
• Operating temperature range of the substitute (-40°C to 85°C) exceeds the original specification

Application Considerations:

• The substitute contact rating of 250 mA is lower than the original 400 mA specification
• Switching voltage specification for the substitute covers 175VDC only, whereas the original covers both 175VAC and 175VDC
• Operate and release times are slower (3 ms versus 1 ms and 1.5 ms respectively)

Selection of the Littelfuse HE3321C0500 is appropriate for applications where the reduced current rating and extended switching times are acceptable within system design parameters.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse HE3321C0500 directly replace the Coto 9081C-05-00 in all applications?

A: Direct replacement is possible only in applications where the contact current requirement does not exceed 250 mA. The original component is rated for 400 mA; the substitute is rated for 250 mA. Circuit design must be verified to confirm that the lower current rating is acceptable.

Q: What is the difference in switching voltage specifications between these components?

A: The Coto 9081C-05-00 is rated for 175VAC and 175VDC maximum switching voltage. The Littelfuse HE3321C0500 is rated for 175VDC maximum only. Applications requiring AC switching capability must retain the original component or identify an alternative that supports both AC and DC switching.

Q: Are the timing characteristics of the substitute compatible with the original?

A: The Littelfuse HE3321C0500 has longer operate and release times (3 ms each) compared to the Coto component (1 ms and 1.5 ms respectively). Applications with strict timing requirements must evaluate whether the extended switching times are acceptable.

Q: What is the advantage of selecting the Littelfuse substitute?

A: The Littelfuse HE3321C0500 is an active product with established supply availability. The original Coto component is obsolete. For new designs and long-term system support, the active substitute provides supply chain reliability and regulatory compliance continuity.

Q: Are the coil specifications identical between these components?

A: Yes. Both components feature 5VDC coil voltage, 40 mA coil current, 125 Ohm coil resistance, and non-latching coil type. Coil-level compatibility is complete.

Q: Do both components meet current environmental and regulatory standards?

A: Yes. Both components are RoHS compliant, REACH Unaffected, and classified under ECCN EAR99. The substitute maintains ROHS3 compliance, which represents the current standard.

Q: What is the operating temperature range difference?

A: The Coto 9081C-05-00 operates from -20°C to 85°C. The Littelfuse HE3321C0500 operates from -40°C to 85°C. The substitute provides extended low-temperature capability.

Q: Are the mounting and termination styles compatible?

A: Yes. Both components feature through-hole mounting and PC pin termination, ensuring mechanical and electrical compatibility at the board level.