MDSR-4-22-38 Equivalent & Substitute Parts

Part Overview

The MDSR-4-22-38 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 designed for applications requiring low-power switching with an operating range of 22 to 38 ampere-turns (AT) and a rated power capacity of 10W at 500mA DC. The part is currently in active production status with 853 units available in bulk packaging. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, application-specific voltage requirements, or packaging preferences.

Substiute Parts

MDSR-4-22-38

Littelfuse Inc.In Stock: 929MDSR-4-22-38 Datasheet

Current PartRFQ

MDCG-4-22-38

Littelfuse Inc.In Stock: 1664MDCG-4-22-38 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDSR-4-22-38 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO
• Operate range: 22 ~ 38 AT
• Mounting type: Through Hole
• Termination style: Axial
• Physical dimensions: 0.090" Dia x 0.600" L (2.28mm x 15.24mm)
• Operating temperature range: -40°C ~ 125°C
• Rated power: 10W
• DC switching voltage: 200 V minimum
• DC switching current: 500mA minimum
• DC carry current: 1.2A minimum

The MDCG-4-22-38 qualifies as a direct substitute because it maintains all mandatory electrical and mechanical parameters. Both devices share identical operate range, physical form factor, temperature rating, and power specifications. The MDCG-4-22-38 additionally supports AC switching at 140V and 350mA, providing extended application flexibility while maintaining full DC compatibility with the original MDSR-4-22-38 specification.

Parameter Comparison

Engineering Selection Recommendations

Both the MDSR-4-22-38 and MDCG-4-22-38 are active production components manufactured by Littelfuse Inc. and carry identical ROHS3 compliance and REACH unaffected status. Selection between these parts is based on application requirements and packaging availability.

The MDSR-4-22-38 is specified for DC-only switching applications at 500mA and 200V DC. The MDCG-4-22-38 provides equivalent DC performance with the addition of AC switching capability at 140V and 350mA, making it suitable for applications requiring dual AC/DC functionality. Both devices maintain identical mechanical form factor, thermal operating range, and switching response times, ensuring direct interchangeability in through-hole PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the MDCG-4-22-38 replace the MDSR-4-22-38 in all applications?

A: Yes. The MDCG-4-22-38 maintains all DC electrical specifications of the MDSR-4-22-38 (500mA at 200V DC, 10W rated power) and adds AC switching capability. Physical dimensions, mounting type, and thermal characteristics are identical, ensuring direct substitution in through-hole circuits.

Q: What is the primary difference between these two parts?

A: The MDCG-4-22-38 supports both AC and DC switching, while the MDSR-4-22-38 is specified for DC applications only. Both share identical operate range (22 ~ 38 AT), power rating (10W), and physical form factor.

Q: Are there packaging differences between these substitutes?

A: Yes. The MDSR-4-22-38 is supplied in bulk packaging, while the MDCG-4-22-38 is supplied in box packaging. Electrical and mechanical specifications remain identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MDSR-4-22-38 and MDCG-4-22-38 are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: What switching response times should be expected?

A: Both parts operate with 0.6 ms operate time and 0.2 ms release time, providing identical switching response characteristics.