MITI-3V1-13-19 Equivalent & Substitute Parts

Part Overview

The MITI-3V1-13-19 is a glass body reed switch manufactured by Littelfuse Inc., configured as a single-pole single-throw normally open (SPST-NO) device. This component is rated for 250mA DC switching at 170V with a 10W power rating and operates within a 13–19AT magnetic field range. The part is currently obsolete, necessitating identification of functionally compatible alternatives to maintain circuit performance in existing designs or new production runs.

Substiute Parts

MITI-3V1-13-19

Littelfuse Inc.In Stock: 787MITI-3V1-13-19 Datasheet

Current PartRFQ

MITI-7-15-20

Littelfuse Inc.In Stock: 6787MITI-7-15-20 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MITI-3V1-13-19 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must remain SPST-NO to preserve switching logic
• Switching Current (DC): Substitute must support minimum 250mA DC
• Switching Voltage (DC): Substitute must support minimum 170V DC
• Power Rating: Substitute must support minimum 10W
• Mounting and Termination: Must match Through Hole with Axial termination for PCB compatibility
• Operating Temperature Range: Must encompass −40°C to 125°C
• Magnetic Operate Range: Substitute operate range must overlap or be compatible with application requirements

The MITI-7-15-20 meets all substitution criteria. While its operate range (15–20AT) is slightly higher than the original (13–19AT), both devices share identical switching current capacity (250mA DC), voltage rating (170V DC), power rating (10W), physical form factor, and thermal specifications. The MITI-7-15-20 is currently in active production status, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The MITI-7-15-20 is the direct substitute for the obsolete MITI-3V1-13-19. Both components are manufactured by Littelfuse Inc. and maintain identical electrical performance for DC switching applications at 250mA and 170V. Both devices are ROHS3 compliant and carry MSL rating of 1, ensuring equivalent environmental and regulatory compliance.

The MITI-7-15-20 offers additional functionality through AC switching capability (180mA at 120V), which does not compromise DC performance. The slightly higher operate range (15–20AT versus 13–19AT) is acceptable for applications where the original 13–19AT range was specified, provided the magnetic field strength in the application falls within the 15–20AT window. The MITI-7-15-20 exhibits faster operate time (500 µs versus 0.45 ms), which may improve circuit response characteristics.

The MITI-7-15-20 is currently in active production status, ensuring immediate availability and long-term supply continuity. Physical form factor compatibility is confirmed: both devices use Through Hole mounting with Axial termination and share identical body dimensions (0.071" diameter × 0.276" length).

Frequently Asked Questions (FAQ)

Q: Can the MITI-7-15-20 directly replace the MITI-3V1-13-19 in existing designs?

A: Yes. Both components share identical DC switching specifications (250mA at 170V), power rating (10W), mounting type (Through Hole), termination style (Axial), and operating temperature range (−40°C to 125°C). Physical dimensions are compatible. The primary consideration is magnetic operate range: the MITI-7-15-20 operates at 15–20AT versus the original 13–19AT. Direct substitution is valid if the application's magnetic field strength falls within the 15–20AT range.

Q: What is the significance of the operate range difference?

A: Operate range defines the magnetic field strength (in Ampere-Turns) required to close the reed switch contacts. The MITI-3V1-13-19 closes at 13–19AT; the MITI-7-15-20 closes at 15–20AT. If your application generates a magnetic field between 13–15AT, the original part will close but the substitute will not. Verify your application's magnetic field strength before substitution.

Q: Are there compliance or certification differences?

A: No. Both the MITI-3V1-13-19 and MITI-7-15-20 are ROHS3 compliant with MSL rating of 1 (Unlimited). Both carry identical environmental and regulatory certifications.

Q: Why is the MITI-7-15-20 shorter in overall length?

A: The MITI-7-15-20 has an overall length of 1.590" (40.39mm) compared to 1.811" (46.00mm) for the MITI-3V1-13-19. This dimensional difference does not affect electrical performance or PCB compatibility. Both devices use identical body diameter (0.071") and axial termination, allowing direct PCB footprint substitution.

Q: Does the faster operate time of the MITI-7-15-20 affect circuit behavior?

A: The MITI-7-15-20 operates in 500 µs versus 0.45 ms for the original part. This faster response may improve circuit switching speed. For most applications, this difference is negligible. If your circuit timing is critical, verify that faster switching does not introduce unintended behavior.

Q: Is the MITI-7-15-20 available in the same packaging?

A: The MITI-7-15-20 is supplied in Box packaging. Confirm packaging requirements with your procurement process.