MDSR-4-22-28 Equivalent & Substitute Parts

Part Overview

The MDSR-4-22-28 is a glass body reed switch manufactured by Littelfuse Inc., configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This through-hole component operates within a 22–28 AT (Ampere-Turn) range and is rated for 500mA DC switching at 200V DC with 10W power handling. The product is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational characteristics align with the original specification, enabling direct replacement in circuit applications.

Substiute Parts

MDSR-4-22-28

Littelfuse Inc.In Stock: 1644MDSR-4-22-28 Datasheet

Current PartRFQ

HA15-2-22-28

Littelfuse Inc.In Stock: 4162HA15-2-22-28 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDSR-4-22-28 is determined by strict alignment of the following critical parameters:

Electrical Compatibility Criteria:

• Circuit configuration must remain SPST-NO
• Operate range must match 22–28 AT specification
• DC switching current must be rated at or above 500mA
• DC switching voltage must be rated at or above 200V
• Rated power must be 10W or greater
• DC carry current must be 1.2A or greater

Mechanical Compatibility Criteria:

• Mounting type must be Through Hole
• Termination style must be Axial
• Overall length must be 1.590" (40.39mm)
• Body size must be 0.090" Dia × 0.600" L (2.28mm × 15.24mm)

Environmental & Compliance Criteria:

• Operating temperature range must encompass −40°C to 125°C
• RoHS3 compliance required
• MSL rating must be 1 (Unlimited)
• REACH Unaffected status required

The substitute part HA15-2-22-28 meets all electrical, mechanical, and compliance requirements for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

Both the MDSR-4-22-28 and HA15-2-22-28 are active products from Littelfuse Inc. with full RoHS3 compliance and REACH Unaffected status. The HA15-2-22-28 substitute part provides equivalent electrical performance for DC switching applications at 500mA and 200V, with identical mechanical form factor and through-hole axial termination. The substitute offers superior DC carry current capability (1.5A versus 1.2A), providing additional margin in continuous current handling. The operating temperature range of the substitute (−20°C to 125°C) is narrower than the original (−40°C to 125°C); selection between these parts depends on the specific application's minimum operating temperature requirement. Both parts are suitable for direct PCB replacement without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can HA15-2-22-28 be used as a direct replacement for MDSR-4-22-28 in all applications?

A: The HA15-2-22-28 is electrically and mechanically compatible for applications operating at or above −20°C. If your application requires operation below −20°C, the MDSR-4-22-28 with its −40°C minimum rating is required. For applications within the −20°C to 125°C range, both parts are functionally equivalent.

Q: What are the key differences between these two reed switches?

A: The primary differences are: (1) operating temperature minimum (MDSR-4-22-28 operates to −40°C; HA15-2-22-28 to −20°C), and (2) DC carry current rating (MDSR-4-22-28 rated 1.2A; HA15-2-22-28 rated 1.5A). All other electrical, mechanical, and compliance parameters are identical.

Q: Are both parts available in the same packaging?

A: No. The MDSR-4-22-28 is supplied in Box packaging, while the HA15-2-22-28 is supplied in Bulk packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the MDSR-4-22-28 and HA15-2-22-28 are RoHS3 compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Both are classified under ECCN EAR99 and HTSUS 8536.50.9065.

Q: What is the switching current specification for these reed switches?

A: Both parts are rated for 500mA DC switching current at 200V DC. The HA15-2-22-28 additionally supports 350mA AC switching at 265V AC, providing expanded AC application capability.

Q: How do the mechanical dimensions affect substitution?

A: Both parts share identical mechanical specifications: 1.590" (40.39mm) overall length, 0.090" diameter × 0.600" length body size, through-hole mounting, and axial termination. They are footprint-compatible for direct PCB replacement without layout modification.