Coto Technology 9081-05-10 Equivalent & Substitute Parts

Part Overview

The Coto Technology 9081-05-10 is a reed relay with SPST-NO contact form rated for 500 mA at 200VAC/200VDC maximum switching voltage. This component operates at 5VDC coil voltage with 10 mA coil current and features EMI shielding for noise-sensitive applications. The product is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and board-level repairs.

Substiute Parts

9081-05-10

Coto TechnologyIn Stock: 10189081-05-10 Datasheet

Current PartRFQ

HE3321A0400

Littelfuse Inc.In Stock: 4954HE3321A0400 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 9081-05-10 is based on matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Coil voltage: 5VDC
• Contact form: SPST-NO
• Current rating: 500 mA minimum
• Switching voltage capability: 200VDC minimum
• Mounting: Through hole with PC pin termination
• Coil type: Non-latching operation
• Coil current: 10 mA

The Littelfuse HE3321A0400 satisfies these requirements with identical coil voltage, contact form, current rating, coil current, and mounting configuration. Both components use PC pin termination suitable for PCB assembly and operate as non-latching relays. The substitute maintains RoHS compliance and REACH compliance status.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse HE3321A0400 is the functional equivalent for obsolete Coto Technology 9081-05-10 applications. Both components meet identical electrical specifications for coil voltage, contact form, current rating, and coil resistance. The Littelfuse part offers extended operating temperature range (-40°C to 85°C versus -20°C to 85°C) and maintains ROHS3 compliance with REACH unaffected status, supporting current regulatory requirements.

The substitute part demonstrates longer operate and release times (1 ms versus 0.5 ms and 0.2 ms respectively), which is acceptable in non-time-critical switching applications. The slightly higher must-release voltage (0.5 VDC versus 0.4 VDC) remains well within acceptable control circuit tolerances given the 3.75 VDC must-operate threshold common to both components.

The Littelfuse HE3321A0400 maintains active product status with established supply availability, addressing the obsolescence constraint of the original Coto component.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse HE3321A0400 be used as a direct pin-for-pin replacement? A: Yes. Both components use identical through-hole PC pin termination and SPST-NO contact configuration, compatible with existing PCB layouts designed for the Coto 9081-05-10.

Q: What is the impact of the increased switching times in the Littelfuse part? A: The Littelfuse HE3321A0400 operates at 1 ms for both operate and release times compared to 0.5 ms and 0.2 ms in the original. This difference is acceptable for general-purpose switching applications where microsecond-level timing precision is not required.

Q: Are there compliance differences between the two parts? A: The Littelfuse part carries ROHS3 compliance, providing upgraded regulatory coverage compared to standard RoHS compliance. Both maintain REACH unaffected status.

Q: What accounts for the wider operating temperature range in the Littelfuse substitute? A: The Littelfuse HE3321A0400 is specified for -40°C to 85°C operation, extending the lower temperature bound by 20°C. This extended range accommodates more demanding environmental conditions while maintaining identical electrical performance within the original -20°C to 85°C range.

Q: Is the slightly higher must-release voltage a concern? A: No. Both parts specify 3.75 VDC must-operate voltage. The must-release voltage difference (0.4 VDC to 0.5 VDC) represents a negligible change in control circuit behavior and does not impact practical application compatibility.