Equivalent & Substitute Parts for Coto Technology 9081-05-00

Part Overview

The Coto Technology 9081-05-00 is a reed relay with SPST-NO contact form rated for 500 mA at 200VAC/200VDC switching voltage. Designed for through-hole mounting with 5VDC coil operation, this component belongs to the 9000 Spartan series. The part is classified as obsolete, necessitating identification of active equivalent components that maintain functional and electrical compatibility for ongoing system support and new designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	9081-05-00
Manufacturer	Coto Technology
Category	Relays
Contact Form	SPST-NO (1 Form A)
Contact Rating (Current)	500 mA
Coil Voltage	5VDC
Switching Voltage	200VAC, 200VDC - Max
Coil Current	10 mA
Coil Resistance	500 Ohms
Mounting Type	Through Hole
Termination Style	PC Pin
Operating Temperature Range	-20°C ~ 85°C
Product Status	Obsolete
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the 9081-05-00 is determined by strict equivalence across the following critical parameters:

Contact form: SPST-NO configuration
Contact rating: 500 mA minimum
Coil voltage: 5VDC
Coil current: 10 mA
Coil resistance: 500 Ohms
Switching voltage capability: 200VDC minimum
Mounting type: Through hole
Termination style: PC pin
Operating temperature range: Must encompass or exceed -20°C to 85°C

The Littelfuse HE3321A0400 meets all substitution criteria. This part maintains identical electrical specifications for coil operation, contact rating, and switching voltage performance. The HE3321A0400 operates across -40°C to 85°C, providing extended low-temperature capability beyond the original specification. Both components feature non-latching coil operation and unlimited moisture sensitivity rating (MSL 1).

Parameter Comparison

Parameter	Coto 9081-05-00	Littelfuse HE3321A0400	Compatibility
Contact Form	SPST-NO (1 Form A)	SPST-NO (1 Form A)	Identical
Contact Rating (Current)	500 mA	500 mA	Identical
Coil Voltage	5VDC	5VDC	Identical
Coil Current	10 mA	10 mA	Identical
Coil Resistance	500 Ohms	500 Ohms	Identical
Switching Voltage (Max)	200VAC, 200VDC	200VDC	Compatible
Must Operate Voltage	3.75 VDC	3.75 VDC	Identical
Must Release Voltage	0.4 VDC	0.5 VDC	Compatible
Operate Time	0.5 ms	1 ms	Compatible
Release Time	0.2 ms	1 ms
Operating Temperature Range	-20°C ~ 85°C	-40°C ~ 85°C	Compatible (Extended)
Mounting Type	Through Hole	Through Hole	Identical
Termination Style	PC Pin	PC Pin	Identical
Coil Type	Non Latching	Non Latching	Identical
RoHS Status	RoHS Compliant	ROHS3 Compliant	Compatible
MSL Rating	1 (Unlimited)	1 (Unlimited)	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical
ECCN	EAR99	EAR99	Identical

Engineering Selection Recommendations

The Littelfuse HE3321A0400 is the direct functional equivalent for the obsolete Coto Technology 9081-05-00. Selection is supported by the following factors:

Active product status: The HE3321A0400 is currently in active production, ensuring long-term availability and supply chain continuity.
Regulatory compliance: Both components maintain REACH unaffected status and EAR99 export classification. The HE3321A0400 achieves ROHS3 compliance, meeting current environmental standards.
Electrical equivalence: Coil voltage, current, resistance, contact rating, and switching voltage specifications are identical or compatible across both components.
Mechanical compatibility: Through-hole mounting and PC pin termination enable direct board-level substitution without layout modification.
Extended operating range: The HE3321A0400 supports -40°C to 85°C operation, providing enhanced performance margin at low temperatures compared to the original -20°C to 85°C specification.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse HE3321A0400 replace the Coto 9081-05-00 in existing designs?

A: Yes. Both components share identical contact form (SPST-NO), coil voltage (5VDC), coil current (10 mA), coil resistance (500 Ohms), contact rating (500 mA), and through-hole PC pin termination. Electrical and mechanical compatibility is confirmed.

Q: What are the differences in switching voltage specifications?

A: The Coto 9081-05-00 specifies 200VAC and 200VDC maximum switching voltage. The Littelfuse HE3321A0400 specifies 200VDC maximum. For applications requiring 200VAC switching capability, the original specification must be verified against actual circuit requirements.

Q: How do the timing characteristics compare?

A: The Coto 9081-05-00 operates in 0.5 ms and releases in 0.2 ms. The Littelfuse HE3321A0400 operates in 1 ms and releases in 1 ms. Both timing values remain within typical relay response windows for standard switching applications. Applications with critical timing requirements must evaluate the 0.5 ms difference in operate time.

Q: Are there packaging differences?

A: The Coto 9081-05-00 is supplied in standard packaging. The Littelfuse HE3321A0400 is supplied in bulk packaging. Reel or tape specifications should be confirmed with the supplier for automated assembly processes.

Q: What is the temperature operating range difference?

A: The Coto 9081-05-00 operates from -20°C to 85°C. The Littelfuse HE3321A0400 operates from -40°C to 85°C. The extended low-temperature range of the HE3321A0400 provides additional margin for applications in cold environments.

Q: Are both components RoHS compliant?

A: Yes. The Coto 9081-05-00 is RoHS compliant. The Littelfuse HE3321A0400 is ROHS3 compliant, meeting current environmental standards.

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