9081C-24-10 Equivalent & Substitute Parts

Part Overview

The 9081C-24-10 is a reed relay manufactured by Coto Technology, classified as a SPDT (Single Pole Double Throw) switching device with a 24VDC coil and 400mA contact rating. This component is marked as obsolete, necessitating identification of active equivalent parts to ensure continued circuit functionality and procurement availability. The relay operates with a 2kΩ coil resistance, non-latching configuration, and EMI shielding suitable for control circuit applications.

Substiute Parts

9081C-24-10

Coto TechnologyIn Stock: 10869081C-24-10 Datasheet

Current PartRFQ

HE3321C2400

Littelfuse Inc.In Stock: 7347HE3321C2400 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9081C-24-10 is based on electrical compatibility within the reed relay category. The critical parameters governing substitute selection are:

Primary Compatibility Criteria:

• Coil voltage: 24VDC (identical requirement)
• Contact form: SPDT (1 Form C) (identical switching topology)
• Coil current: 12 mA (identical drive requirement)
• Coil type: Non Latching (identical operational mode)
• Coil resistance: 2 kOhms (identical electrical load)
• Termination style: PC Pin (identical printed circuit board integration)
• Mounting type: Through Hole (identical physical installation)
• Must operate voltage: 18 VDC minimum (identical activation threshold)
• Must release voltage: 2 VDC maximum (identical deactivation threshold)

Secondary Compatibility Parameters (allowing variation within functional limits):

• Contact rating current: Minimum 400mA required; lower ratings indicate reduced current handling capacity
• Switching voltage: Minimum 175VDC required; lower ratings indicate reduced voltage isolation capability
• Operating temperature range: Extended range acceptable; minimum -20°C and maximum 85°C required
• Timing parameters (operate/release time): Variation acceptable within circuit design constraints
• Compliance certifications: RoHS and REACH status required for regulatory adherence

The HE3321C2400 from Littelfuse Inc. meets all primary criteria with the following considerations: contact rating reduced from 400mA to 250mA, switching voltage limited to 175VDC (no VAC specification), extended operating temperature range (-40°C to 85°C), and extended timing characteristics (3ms operate/release vs. 1ms/1.5ms).

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 9081C-24-10 is classified as obsolete, making the HE3321C2400 (active product status from Littelfuse Inc.) the appropriate substitute for continued procurement and design continuity.

Compliance Assessment: Both parts satisfy RoHS and REACH regulatory requirements. The HE3321C2400 achieves ROHS3 compliance, representing current regulatory alignment superior to the obsolete part's RoHS standard.

Electrical Compatibility: The HE3321C2400 maintains identical coil drive characteristics (24VDC, 12mA, 2kΩ) and switching topology (SPDT, non-latching), ensuring control circuit integration without modification. The contact current rating reduction from 400mA to 250mA requires circuit load verification; applications exceeding 250mA cannot use this substitute.

Mechanical Integration: Identical through-hole PC pin termination and packaging geometry (Tube) enable direct printed circuit board installation without layout revision.

Timing Considerations: The HE3321C2400 exhibits extended operate and release times (3ms each versus 1ms/1.5ms). Circuits with tight timing requirements must evaluate whether 3ms latency is acceptable; circuits with 10ms or greater timing margins generally accommodate this characteristic without function degradation.

Frequently Asked Questions (FAQ)

Q: Can the HE3321C2400 directly replace the 9081C-24-10 in all applications? A: Direct substitution requires verification that the application load current does not exceed 250mA (the substitute's contact rating). The original part supports 400mA; applications drawing 251-400mA require alternative solutions. All other electrical parameters and mounting interfaces are compatible.

Q: What is the significance of the reduced contact current rating in the HE3321C2400? A: Contact current rating establishes the maximum continuous current the relay contacts can safely switch without degradation. A 250mA rating indicates the substitute can reliably control loads up to 250mA; exceeding this limit risks contact erosion and premature failure.

Q: Does the HE3321C2400 operate at the same coil voltage as the 9081C-24-10? A: Yes. Both parts require 24VDC for coil activation and operate at identical activation/deactivation voltage thresholds (18VDC operate, 2VDC release), enabling direct control circuit connection.

Q: Why does the HE3321C2400 lack an AC voltage rating while the original part specifies 175VAC? A: The substitute is rated only for DC switching (175VDC max). Applications requiring AC voltage isolation or AC load switching must confirm the circuit operates in DC mode exclusively. AC circuit applications cannot use this substitute.

Q: Does the extended timing in the HE3321C2400 affect circuit function? A: The substitute's 3ms operate and release times introduce a 2ms delay compared to the original 1ms operate time and 1.5ms longer release time. Applications with timing-critical functions (such as sequence-dependent switching or high-frequency pulsing) must evaluate whether this latency affects performance. Circuits with >10ms cycle times typically accommodate this characteristic without degradation.

Q: Are the physical footprints and pin configurations identical? A: Yes. Both parts use through-hole PC pin termination and SPDT contact form, enabling installation in existing circuit board layouts without modification.

Q: What is the benefit of the HE3321C2400's extended temperature range? A: The substitute operates down to -40°C versus the original -20°C minimum, providing improved functionality in cold ambient conditions. This extended range is beneficial for applications in unheated environments, cold storage, or outdoor installations.