MITI-3V1-Q2146 Equivalent & Substitute Parts

Part Overview

The MITI-3V1-Q2146 is a glass body reed switch manufactured by Littelfuse Inc., configured as a single-pole single-throw normally open (SPST-NO) device. This through-hole component is rated for 250mA DC switching at 170V DC and operates across a temperature range of -40°C to 125°C. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure ongoing component availability for production and repair applications.

Substiute Parts

MITI-3V1-Q2146

Littelfuse Inc.In Stock: 748MITI-3V1-Q2146 Datasheet

Current PartRFQ

MITI-7-Q2146

Littelfuse Inc.In Stock: 909MITI-7-Q2146 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MITI-3V1-Q2146 is based on strict electrical and mechanical parameter alignment within the Littelfuse reed switch product family. The primary substitute, MITI-7-Q2146, maintains compatibility through the following critical parameters:

Electrical Compatibility:

• Identical SPST-NO circuit configuration
• DC switching current rating of 250mA (meets or exceeds original specification)
• DC switching voltage of 170V (identical to original)
• DC carry current of 500mA (identical to original)
• Operating temperature range of -40°C to 125°C (identical to original)

Mechanical Compatibility:

• Through-hole mounting type (identical)
• Axial termination style (identical)
• Glass body reed construction (identical)
• Body diameter and length specifications (identical: 0.071" Dia × 0.276" L)

Functional Compatibility:

• Operate time of 0.5 ms (original: 450 µs; within acceptable switching performance envelope)
• Release time of 0.2 ms (identical to original)
• Capacitance of 0.3 pF (identical to original)

The MITI-7-Q2146 is classified as active product status with current manufacturing support and regulatory compliance documentation (EAR99, HTSUS 8536.50.9065).

Parameter Comparison

Engineering Selection Recommendations

The MITI-7-Q2146 is the direct substitute for the obsolete MITI-3V1-Q2146 based on the following engineering criteria:

Product Status and Availability: The MITI-3V1-Q2146 is classified as obsolete, indicating discontinued manufacturing and limited long-term component availability. The MITI-7-Q2146 maintains active product status with current manufacturing support from Littelfuse Inc., ensuring reliable supply chain access for new production builds and field replacements.

Regulatory and Compliance Status: The MITI-7-Q2146 carries current regulatory classifications (EAR99 export control designation and HTSUS commodity code 8536.50.9065), confirming compliance with current trade and manufacturing standards. The obsolete MITI-3V1-Q2146 lacks current regulatory documentation.

Electrical and Mechanical Equivalence: All critical electrical parameters—DC switching current (250mA), DC switching voltage (170V), DC carry current (500mA), and operating temperature range (-40°C to 125°C)—are identical between the original and substitute parts. Mechanical parameters including mounting type (through-hole), termination style (axial), body dimensions, and glass reed construction are fully compatible.

Switching Performance: The operate time difference of 50 microseconds (MITI-3V1-Q2146: 450 µs; MITI-7-Q2146: 0.5 ms) falls within the acceptable performance envelope for reed switch applications and does not introduce functional incompatibility in standard switching circuits.

Frequently Asked Questions (FAQ)

Q: Can the MITI-7-Q2146 be used as a direct replacement for the MITI-3V1-Q2146 in existing designs?

A: Yes. The MITI-7-Q2146 is electrically and mechanically equivalent to the MITI-3V1-Q2146 across all critical parameters: DC switching current (250mA), DC switching voltage (170V), DC carry current (500mA), operating temperature range (-40°C to 125°C), through-hole mounting, and axial termination. No circuit modifications are required.

Q: What is the significance of the operate time difference between these parts?

A: The MITI-3V1-Q2146 operates in 450 microseconds, while the MITI-7-Q2146 operates in 0.5 milliseconds (500 microseconds). This 50-microsecond difference is negligible for standard reed switch applications and does not affect functional compatibility in typical switching circuits.

Q: Why is the MITI-3V1-Q2146 classified as obsolete?

A: Obsolete classification indicates that Littelfuse Inc. has discontinued manufacturing of this part number. The MITI-7-Q2146 represents the active equivalent within the current product portfolio, ensuring ongoing availability and manufacturing support.

Q: Are there any package or footprint differences between these parts?

A: No. Both parts share identical mechanical specifications: 0.071-inch diameter body, 0.276-inch length, through-hole mounting, and axial termination. PCB footprints and mounting requirements are identical.

Q: What regulatory certifications apply to the MITI-7-Q2146?

A: The MITI-7-Q2146 carries EAR99 export control classification and HTSUS commodity code 8536.50.9065, confirming compliance with current U.S. export regulations and tariff classifications for reed switches.

Q: Is the MITI-7-Q2146 suitable for both AC and DC applications?

A: The MITI-7-Q2146 is rated for 180mA AC and 250mA DC switching. The original MITI-3V1-Q2146 specification provided only DC ratings (250mA). For DC-only applications, both parts are fully compatible. AC capability in the substitute part provides additional application flexibility without compromising DC performance.