Equivalent & Substitute Parts for 48BFSP1M6RT

Part Overview

The 48BFSP1M6RT is an SPDT slide switch manufactured by Grayhill Inc., rated for 0.4VA at 20V AC/DC. This through-hole, right-angle mounted switch features gold-plated copper alloy contacts, epoxy sealed terminals, and polyamide actuators. The component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical ratings, mechanical configurations, and circuit topologies are available from alternative manufacturers. This ensures design flexibility and supply chain continuity while maintaining functional equivalence.

Substiute Parts

48BFSP1M6RT

Grayhill Inc.In Stock: 78548BFSP1M6RT Datasheet

Current PartRFQ

1571984-1

TE Connectivity ALCOSWITCH SwitchesIn Stock: 43461571984-1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 48BFSP1M6RT is determined by strict equivalence across the following critical parameters:

Electrical Equivalence:

• Circuit type must be SPDT
• Current rating must be 0.4VA or higher (AC/DC)
• Voltage rating must be 20V AC and 20V DC minimum
• Contact material must provide gold-plated finish for equivalent conductivity and corrosion resistance

Mechanical Equivalence:

• Mounting configuration must be through-hole, right-angle orientation
• Termination must be PC pin style for PCB compatibility
• Switch function must be On-On (no intermediate position)
• Actuator material must be polymer-based (polyamide or polybutylene terephthalate)

Environmental & Regulatory Equivalence:

• Operating temperature range must encompass -30°C to 85°C or demonstrate equivalent thermal performance
• RoHS3 compliance is mandatory
• Epoxy sealed terminals required for environmental protection

The substitute part 1571984-1 (TE Connectivity ALCOSWITCH Switches, TSS Series) meets all substitution criteria through matching electrical ratings, identical mounting and termination specifications, and equivalent environmental sealing.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (48BFSP1M6RT): Select the Grayhill 48BFSP1M6RT when the original design specification explicitly requires the 48B series characteristics, when inventory availability is critical (715 units in stock), or when the design has been validated against this specific part number. This part maintains Active product status with full ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute Part Selection (1571984-1): The TE Connectivity 1571984-1 is a direct functional equivalent suitable for applications where:

• Supply chain continuity is required and primary part availability is constrained
• The application operates within the -20°C to 80°C temperature envelope (narrower than primary part)
• Enhanced electrical life (60,000 cycles versus 30,000 cycles) provides design margin
• Documented mechanical life specification (60,000 cycles) is required for reliability analysis
• Non-shorting contact sequence (BBM) is compatible with circuit requirements

Both parts maintain identical electrical ratings (0.4VA, 20V AC/DC), circuit configuration (SPDT), mounting method (through-hole right-angle), and termination style (PC pin). Both are ROHS3 compliant and feature epoxy sealed terminals with gold-plated contacts.

Dimensional Consideration: The actuator length difference (3.10mm primary versus 2.79mm substitute) is minor and does not affect PCB footprint compatibility. Both parts share identical switch travel (3.05mm), ensuring equivalent mechanical operation.

Frequently Asked Questions (FAQ)

Q: Can 1571984-1 be used as a direct replacement for 48BFSP1M6RT in existing designs?

A: Yes, for applications operating within -20°C to 80°C. The substitute part matches all critical electrical parameters (0.4VA, 20V AC/DC, SPDT configuration), mounting type (through-hole right-angle), and termination style (PC pin). The narrower operating temperature range is the only functional limitation. If the design requires operation below -20°C or above 80°C, the primary part must be retained.

Q: What is the difference between the contact timing specifications?

A: The primary part (48BFSP1M6RT) does not specify contact timing. The substitute part (1571984-1) specifies Non-Shorting (BBM) contact sequence, meaning the new contact closes before the old contact opens. This is a standard SPDT characteristic and is compatible with typical circuit applications. Verify circuit requirements if shorting contact behavior is specifically needed.

Q: Are there any PCB layout changes required when substituting 1571984-1 for 48BFSP1M6RT?

A: No PCB layout changes are required. Both parts use identical through-hole, right-angle mounting with PC pin termination. The minor actuator length difference (3.10mm versus 2.79mm) does not affect footprint compatibility or solder pad positioning.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on supply availability and application requirements. The TE Connectivity 1571984-1 offers advantages in electrical life (60,000 cycles) and documented mechanical life specification. The Grayhill 48BFSP1M6RT is appropriate if the design specifically requires the 48B series or if the extended temperature range (-30°C to 85°C) is necessary.

Q: What is the significance of the "Non-Shorting (BBM)" specification on the substitute part?

A: BBM (Break-Before-Make) contact timing ensures the existing contact opens before the new contact closes, preventing momentary short circuits during switching. This is standard for SPDT switches and is suitable for most applications. If the circuit requires Make-Before-Break (MBB) behavior, this must be verified with the circuit design requirements.

Q: Are both parts suitable for high-reliability applications?

A: Both parts are suitable for standard industrial applications. The substitute part (1571984-1) provides higher electrical life (60,000 cycles) and documented mechanical life, offering additional design margin. For mission-critical applications, conduct application-specific reliability analysis based on cycle count requirements and environmental conditions.

Q: What is the inventory status for each part?

A: The primary part (48BFSP1M6RT) has 715 units in stock. The substitute part (1571984-1) has 4,263 units in stock. The substitute offers significantly higher availability for immediate procurement needs.