DIP24-1C90-51L Reed Relay SPDT 500mA 24VDC Equivalent & Substitute Parts

Part Overview

The DIP24-1C90-51L is an active-status reed relay manufactured by Standex-Meder Electronics, designed for switching applications requiring single-pole double-throw (SPDT) contact configuration at 24VDC coil voltage. This through-hole mounted component operates at 500mA contact rating with a coil current of 12mA and 2kOhms coil resistance. The relay is ROHS3 compliant and REACH unaffected, suitable for industrial control and signal switching applications. Equivalent parts are identified based on matching coil voltage, contact form, coil current, coil resistance, and termination style, with allowable variations in contact rating, switching voltage, and timing parameters within acceptable operating ranges.

Substiute Parts

DIP24-1C90-51L

Standex-Meder ElectronicsIn Stock: 1040DIP24-1C90-51L Datasheet

Current PartRFQ

HE721C2400

Littelfuse Inc.In Stock: 1223HE721C2400 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DIP24-1C90-51L are identified based on the following critical matching parameters:

Primary Matching Criteria (Must Match):

• Coil Voltage: 24VDC
• Contact Form: SPDT (1 Form C)
• Coil Current: 12mA
• Coil Resistance: 2kOhms
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching

Secondary Parameters (Allowable Variation):

• Contact Rating (Current): Substitute must equal or exceed the application requirement
• Switching Voltage: Substitute must support the application voltage
• Operate/Release Time: Variation acceptable based on application timing requirements
• Operating Temperature Range: Substitute range must encompass application operating conditions
• Must Operate/Release Voltage: Substitute values must be compatible with circuit design

The HE721C2400 from Littelfuse Inc. meets all primary matching criteria and is classified as a direct substitute for the DIP24-1C90-51L.

Parameter Comparison

Engineering Selection Recommendations

DIP24-1C90-51L Selection Criteria:

• Applications requiring 500mA contact current rating
• Circuits requiring faster switching response (0.7ms operate time)
• Systems operating within -20°C to 70°C temperature range
• Applications requiring both 175VAC and 175VDC switching capability
• Standex-Meder component availability and supply chain requirements

HE721C2400 Selection Criteria:

• Applications with contact current requirements of 250mA or lower
• Circuits tolerant of slower switching response (3ms operate and release time)
• Systems requiring extended operating temperature range (-40°C to 85°C)
• Applications requiring only 175VDC switching capability
• Littelfuse component availability and supply chain requirements
• Cost optimization where lower contact rating is acceptable

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility. Selection between these parts depends on specific application current, timing, and temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can HE721C2400 directly replace DIP24-1C90-51L in all applications?

A: Direct replacement is possible only when the application current requirement does not exceed 250mA. The HE721C2400 contact rating is 250mA compared to the DIP24-1C90-51L rating of 500mA. Applications requiring higher current must use the DIP24-1C90-51L or equivalent 500mA-rated substitute.

Q: What are the timing differences between these relays?

A: The DIP24-1C90-51L operates in 0.7ms and releases in 1.5ms. The HE721C2400 operates in 3ms and releases in 3ms. Applications with timing-critical switching requirements must account for these differences in circuit design.

Q: Are the coil specifications identical?

A: Yes. Both relays operate at 24VDC coil voltage, draw 12mA coil current, and have 2kOhms coil resistance. These parameters are identical and ensure compatible drive circuit requirements.

Q: What is the difference in switching voltage capability?

A: The DIP24-1C90-51L supports 175VAC and 175VDC maximum switching voltage. The HE721C2400 specification lists 175VDC maximum only. Applications requiring AC switching capability must use the DIP24-1C90-51L.

Q: Are both relays through-hole mounted with PC pins?

A: Yes. Both relays use through-hole mounting with PC pin termination style, ensuring identical PCB footprint and installation compatibility.

Q: Do both relays meet current regulatory requirements?

A: Yes. Both the DIP24-1C90-51L and HE721C2400 are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components.

Q: What is the operating temperature range difference?

A: The DIP24-1C90-51L operates from -20°C to 70°C. The HE721C2400 operates from -40°C to 85°C, providing a wider temperature range. Applications in extreme temperature environments may benefit from the HE721C2400 extended range.

Q: How do the must-operate and must-release voltages compare?

A: The DIP24-1C90-51L requires 16.8VDC to operate and 3.6VDC to release. The HE721C2400 requires 16VDC to operate and 2VDC to release. Both are compatible with standard 24VDC nominal circuits with typical voltage regulation tolerances.