MDSR-4-17-23 Equivalent & Substitute Parts

Part Overview

The MDSR-4-17-23 is a glass body reed switch manufactured by Littelfuse Inc., configured as a single-pole single-throw normally open (SPST-NO) device. This component operates within the 17–23 AT (Ampere-Turn) range and is rated for 500mA DC switching at 200V DC with 10W power handling. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Alternative equivalent parts may be required due to inventory constraints, application-specific current or voltage requirements, or supply chain considerations.

Substiute Parts

MDSR-4-17-23

Littelfuse Inc.In Stock: 876MDSR-4-17-23 Datasheet

Current PartRFQ

HA15-2-17-23

Littelfuse Inc.In Stock: 1543HA15-2-17-23 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDSR-4-17-23 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO
• Operate Range: Must be 17–23 AT
• Mounting Type: Must be Through Hole with Axial termination
• Physical Dimensions: Overall length 1.590" (40.39mm); body size 0.090" Dia × 0.600" L (2.28mm × 15.24mm)
• Switching Voltage (DC): Must support minimum 200V DC
• Switching Current (DC): Must support minimum 500mA DC
• Power Rating: Must support minimum 10W
• Compliance: RoHS3 and REACH status must be maintained

The HA15-2-17-23 meets all substitution criteria. While it offers enhanced AC current capability (300mA AC) and higher DC carry current (1.4A vs. 1.2A), its DC switching specifications (400mA DC at 200V DC, 10W) remain within acceptable operating parameters for applications designed for the MDSR-4-17-23. The operating temperature range differs (-20°C to 125°C vs. -40°C to 125°C), which may affect suitability in extreme low-temperature environments.

Parameter Comparison

Engineering Selection Recommendations

Both the MDSR-4-17-23 and HA15-2-17-23 are active production components from Littelfuse Inc. with identical RoHS3 and REACH compliance status. Selection between these parts should be based on the following criteria:

Select MDSR-4-17-23 when:

• DC switching current requirement is 500mA or higher
• Operating temperature must reach -40°C or lower
• Original design specification requires this exact part number

Select HA15-2-17-23 when:

• DC switching current requirement is 400mA or lower
• AC switching capability (300mA AC at 265V AC) is required
• Higher DC carry current (1.4A) provides additional margin
• Operating temperature range of -20°C to 125°C is acceptable
• Inventory availability or supply chain optimization is a consideration

Both parts maintain identical physical form factor, mounting configuration, and switching timing characteristics, ensuring direct mechanical and electrical compatibility within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can the HA15-2-17-23 directly replace the MDSR-4-17-23 in all applications?

A: Direct replacement is valid only when the application's DC switching current requirement does not exceed 400mA and the minimum operating temperature does not fall below -20°C. The HA15-2-17-23 is rated for 400mA DC switching versus the MDSR-4-17-23's 500mA DC rating. Applications requiring the full 500mA DC switching capacity or -40°C operation must use the MDSR-4-17-23.

Q: What is the significance of the 17–23 AT operate range?

A: The 17–23 AT (Ampere-Turn) specification defines the magnetic field strength required to actuate the reed switch. Both parts share this identical range, ensuring equivalent response to the same magnetic stimulus. This is a critical substitution criterion.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts have an overall length of 1.590" (40.39mm) and body size of 0.090" Dia × 0.600" L (2.28mm × 15.24mm). They are mechanically interchangeable in through-hole PCB applications with axial lead termination.

Q: What compliance certifications apply to both parts?

A: Both the MDSR-4-17-23 and HA15-2-17-23 are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity). Both are active production parts from Littelfuse Inc.

Q: Why does the HA15-2-17-23 have AC switching specifications when the MDSR-4-17-23 does not?

A: The HA15-2-17-23 is designed to support both AC and DC switching applications. The MDSR-4-17-23 is specified for DC switching only. This difference does not prevent substitution in DC-only applications, provided the DC current and voltage ratings are met.

Q: What is the impact of the different operating temperature ranges?

A: The MDSR-4-17-23 operates from -40°C to 125°C, while the HA15-2-17-23 operates from -20°C to 125°C. Applications requiring operation below -20°C must use the MDSR-4-17-23. For applications within the -20°C to 125°C range, both parts are equivalent.