MITI-3V1-Q4397 Equivalent & Substitute Parts

Part Overview

The MITI-3V1-Q4397 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 operations at 170V DC. The part is currently classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure ongoing component availability for production and field service applications.

Substiute Parts

MITI-3V1-Q4397

Littelfuse Inc.In Stock: 721MITI-3V1-Q4397 Datasheet

Current PartRFQ

MITI-7-Q4397

Littelfuse Inc.In Stock: 1235MITI-7-Q4397 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The MITI-7-Q4397 qualifies as a direct substitute for the MITI-3V1-Q4397 based on the following alignment of critical electrical and mechanical parameters:

Electrical Compatibility:

• Both devices maintain SPST-NO circuit configuration
• DC switching current rating of 250mA is identical
• DC switching voltage of 170V is identical
• Current carry capacity of 500mA (DC) is identical
• Operating temperature range of -40°C ~ 125°C is identical
• Capacitance specification of 0.3 pF is identical

Mechanical Compatibility:

• Both employ glass body reed switch construction
• Both utilize through-hole mounting
• Both feature axial termination style
• Body dimensions are identical: 0.071" Dia x 0.276" L (1.80mm x 7.00mm)

Product Status Advantage:

• MITI-7-Q4397 carries Active product status, ensuring continued availability and support
• MITI-3V1-Q4397 is classified as Obsolete

The MITI-7-Q4397 additionally supports AC switching at 180mA and 120V AC, providing extended operational flexibility without compromising DC performance specifications.

Parameter Comparison

Engineering Selection Recommendations

The MITI-7-Q4397 is the appropriate selection for applications currently specified with MITI-3V1-Q4397 components. This substitution is supported by:

Electrical Equivalence: All DC electrical parameters critical to circuit operation are identical, including switching current (250mA), switching voltage (170V), and current carry capacity (500mA).

Mechanical Compatibility: Through-hole mounting, axial termination, and body dimensions ensure direct physical compatibility in existing PCB layouts and assembly processes.

Product Lifecycle Status: The MITI-7-Q4397 maintains Active product status with Littelfuse Inc., ensuring continued manufacturing support, availability, and compliance documentation. The MITI-3V1-Q4397 obsolete status creates supply chain risk and limits access to technical support.

Compliance and Certification: The MITI-7-Q4397 carries ECCN classification EAR99 and HTSUS code 8536.50.9065, providing regulatory clarity for procurement and export documentation.

Operational Characteristics: While operate time increases marginally from 450 µs to 0.5 ms, this difference does not impact DC switching applications within standard circuit timing requirements. Release time remains constant at 0.2 ms.

Frequently Asked Questions (FAQ)

Q: Can MITI-7-Q4397 be used as a direct replacement for MITI-3V1-Q4397 in existing designs?

A: Yes. The MITI-7-Q4397 maintains identical DC electrical specifications (250mA switching current, 170V switching voltage, 500mA carry current) and mechanical compatibility (through-hole mounting, axial termination, identical body dimensions). No circuit modifications are required.

Q: What is the significance of the overall length difference between these parts?

A: The MITI-7-Q4397 has an overall length of 1.590" (40.39mm) compared to 1.811" (46.00mm) for the MITI-3V1-Q4397. This shorter profile does not affect electrical performance and may provide layout advantages. Body dimensions remain identical, ensuring consistent electrical characteristics.

Q: Does the MITI-7-Q4397 support AC switching applications?

A: Yes. The MITI-7-Q4397 supports AC switching at 180mA and 120V AC in addition to its DC specifications. This extended capability does not compromise DC performance and provides design flexibility for applications requiring AC switching capability.

Q: Why is product status important in this substitution?

A: The MITI-3V1-Q4397 is classified as Obsolete, indicating discontinued manufacturing and limited availability. The MITI-7-Q4397 maintains Active status, ensuring ongoing production, component availability, and manufacturer technical support for the design lifecycle.

Q: Are there any timing differences between these components?

A: Operate time differs slightly: MITI-3V1-Q4397 operates at 450 µs while MITI-7-Q4397 operates at 0.5 ms. Release time is identical at 0.2 ms for both devices. This marginal difference in operate time does not impact standard DC switching circuit performance.

Q: What certifications and compliance information is available for the substitute part?

A: The MITI-7-Q4397 carries ECCN classification EAR99 and HTSUS code 8536.50.9065, providing regulatory documentation for procurement, inventory management, and export compliance purposes.