MITI-3V1-Q2621 Equivalent & Substitute Parts

Part Overview

The MITI-3V1-Q2621 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 designed for DC switching applications with a 250mA operating current rating and 170V DC switching voltage capability. The part is 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-Q2621

Littelfuse Inc.In Stock: 946MITI-3V1-Q2621 Datasheet

Current PartRFQ

MITI-7-Q2621

Littelfuse Inc.In Stock: 937MITI-7-Q2621 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MITI-3V1-Q2621 is determined by equivalence across the following critical parameters:

Circuit Configuration: Both the main part and substitute maintain SPST-NO topology, ensuring identical switching behavior and pin functionality.

Switching Current Capability: The substitute part supports 250mA DC switching current, matching the primary operating specification of the original component.

DC Switching Voltage: The substitute maintains 170V DC switching voltage rating, preserving voltage compatibility in target applications.

Mounting and Termination: Through-hole mounting with axial termination style is preserved, enabling direct mechanical and electrical compatibility in existing PCB layouts.

Operating Temperature Range: The substitute operates across the identical -40°C to 125°C temperature envelope, maintaining thermal performance specifications.

Body Dimensions and Capacitance: Physical dimensions and parasitic capacitance (0.3 pF) remain consistent, ensuring form-factor compatibility and signal integrity characteristics.

The MITI-7-Q2621 substitute part is classified as active product status, providing assured long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The MITI-7-Q2621 is the direct substitute for the obsolete MITI-3V1-Q2621 based on functional equivalence across all critical electrical and mechanical parameters. Both components are manufactured by Littelfuse Inc. and maintain identical SPST-NO circuit configuration, DC switching current (250mA), DC switching voltage (170V), operating temperature range (-40°C to 125°C), and parasitic capacitance (0.3 pF).

The substitute part carries active product status with EAR99 export classification and HTSUS code 8536.50.9065, ensuring regulatory compliance and supply chain continuity. The MITI-7-Q2621 is currently in stock with 837 pieces available as new original inventory.

Minor differences exist in operate time (0.5 ms versus 450 µs) and overall length (40.39mm versus 46.00mm). The operate time difference of 50 microseconds is within typical application tolerances for reed switch switching applications. The reduced overall length of the substitute part accommodates existing through-hole PCB layouts without requiring design modification, as the body diameter and termination style remain unchanged.

Selection of the MITI-7-Q2621 eliminates obsolescence risk and provides access to an actively manufactured component with established supply chain support.

Frequently Asked Questions (FAQ)

Q: Can the MITI-7-Q2621 be used as a direct replacement for the MITI-3V1-Q2621 in existing designs?

A: Yes. Both components share identical SPST-NO circuit configuration, 250mA DC switching current, 170V DC switching voltage, operating temperature range, and body dimensions. The through-hole axial termination style enables direct PCB compatibility without layout modification.

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

A: The MITI-7-Q2621 operates at 0.5 ms compared to the MITI-3V1-Q2621 at 450 µs, representing a 50-microsecond difference. This variance is typical among reed switch variants and does not affect compatibility in standard switching applications. Applications requiring sub-microsecond timing precision should evaluate this parameter against specific circuit requirements.

Q: Does the shorter overall length of the MITI-7-Q2621 affect PCB assembly?

A: No. The substitute part measures 40.39mm overall length versus 46.00mm for the original part. The body diameter (1.80mm) and axial termination style remain identical, ensuring compatibility with existing through-hole footprints. The reduced length provides additional clearance in confined PCB layouts.

Q: What is the product status difference, and why does it matter?

A: The MITI-3V1-Q2621 is classified as obsolete, indicating discontinued manufacturing and limited availability. The MITI-7-Q2621 is active product status, ensuring ongoing manufacturing, established supply chain support, and long-term component availability for production and repair applications.

Q: Are there any regulatory or compliance differences between these parts?

A: The MITI-7-Q2621 carries EAR99 export classification and HTSUS code 8536.50.9065. These designations confirm compliance with standard export and tariff requirements for electronic switching components. The original part is marked as obsolete without current regulatory designations.

Q: Can the MITI-7-Q2621 handle the same current and voltage specifications?

A: Yes. The substitute part maintains identical DC switching current (250mA), DC switching voltage (170V), and current carry rating (500mA DC). Electrical performance specifications are fully equivalent across all switching and load parameters.