MRJB4304 Equivalent & Substitute Parts

Part Overview

The MRJB4304 is a rotary switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a 3-position, 4-pole, 3-throw (4P3T) non-shorting switch rated for 0.4VA at 20V AC/DC. The switch features a screwdriver slot actuator, gold-plated nickel contacts, and through-hole PC pin termination with epoxy sealed terminals. This part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing applications requiring component replacement.

Substiute Parts

MRJB4304

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1189MRJB4304 Datasheet

Current PartRFQ

A403S1RNCB

C&KIn Stock: 745A403S1RNCB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MRJB4304 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• 3-position, 4-pole, 3-throw (4P3T) circuit configuration
• Non-shorting (BBM) contact timing
• 0.4VA current rating at AC/DC operation
• 20V AC and 20V DC voltage ratings

Mechanical Equivalence Requirements:

• Screwdriver slot actuator type
• 30° angle of throw
• Gold contact finish
• PC pin termination style
• Through-hole mounting capability

Environmental & Compliance Requirements:

• RoHS compliance status
• Moisture Sensitivity Level 1 (Unlimited)

The substitute part A403S1RNCB from C&K meets all electrical and mechanical equivalence criteria while maintaining compliance certifications. Differences in contact material composition (copper alloy versus nickel), actuator length specification, depth behind panel, and mounting configuration options do not preclude functional substitution when the primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

The A403S1RNCB from C&K is a direct functional equivalent to the obsolete MRJB4304. Selection between these parts is based on the following engineering criteria:

Product Status Consideration: The MRJB4304 is classified as obsolete. The A403S1RNCB maintains active product status, ensuring ongoing availability and manufacturer support for new designs and production requirements.

Compliance Certifications: Both parts maintain RoHS compliance. The A403S1RNCB carries ROHS3 compliance certification and REACH Unaffected status, providing enhanced regulatory documentation for applications requiring advanced environmental compliance verification.

Electrical Performance: Both parts deliver identical electrical performance across all specified parameters: 4P3T configuration, 0.4VA rating, 20V AC/DC operation, and non-shorting contact timing. No electrical performance degradation occurs with substitution.

Mechanical Integration: The A403S1RNCB supports both panel mount and through-hole mounting configurations, providing greater installation flexibility than the MRJB4304. The through-hole PC pin termination remains consistent. Physical depth behind panel differs (14.48mm versus 7.62mm), requiring verification of available panel space in existing designs.

Contact Material Difference: The A403S1RNCB uses copper alloy contacts with gold finish, compared to the MRJB4304's nickel contacts with gold finish. Both configurations maintain gold surface finish for equivalent contact reliability and signal integrity at the specified 0.4VA rating.

Frequently Asked Questions (FAQ)

Q: Can the A403S1RNCB directly replace the MRJB4304 in existing circuit designs?

A: Yes. The A403S1RNCB meets all electrical and mechanical equivalence criteria for the MRJB4304. Both parts deliver identical 4P3T switching configuration, 0.4VA current rating, 20V AC/DC voltage operation, and non-shorting contact timing. PC pin termination and screwdriver slot actuation are consistent across both parts.

Q: What is the significance of the different depth behind panel measurements?

A: The MRJB4304 specifies 7.62mm depth behind panel, while the A403S1RNCB specifies 14.48mm. This difference reflects the A403S1RNCB's dual mounting capability (panel mount and through-hole). In through-hole applications, verify available panel space to accommodate the greater depth. Panel cutout dimensions for the A403S1RNCB are specified as circular 9.80mm diameter.

Q: Are there differences in contact material that affect performance?

A: The MRJB4304 uses nickel contacts with gold finish; the A403S1RNCB uses copper alloy contacts with gold finish. Both configurations provide equivalent contact reliability and signal integrity at the 0.4VA rating. The gold finish on both parts ensures consistent contact resistance and corrosion resistance for the specified electrical load.

Q: What is the difference between the actuator length specifications?

A: The MRJB4304 specifies actuator length as 1.02mm. The A403S1RNCB specifies actuator length as flush. Both configurations use screwdriver slot actuation with 30° angle of throw. The flush actuator on the A403S1RNCB provides a more compact profile suitable for panel-mounted applications.

Q: Are both parts RoHS compliant?

A: Yes. The MRJB4304 is RoHS Compliant. The A403S1RNCB is ROHS3 Compliant and carries REACH Unaffected status, providing enhanced regulatory documentation for applications requiring advanced environmental compliance verification.

Q: What is the moisture sensitivity level for both parts?

A: Both the MRJB4304 and A403S1RNCB carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or soldering processes.

Q: Can the A403S1RNCB be used in both panel mount and through-hole applications?

A: Yes. The A403S1RNCB supports both panel mount and through-hole mounting configurations. The MRJB4304 is specified for through-hole mounting only. Verify panel cutout dimensions (circular 9.80mm diameter) and available depth space (14.48mm) when implementing panel mount configuration.