LS75C4D-T Equivalent & Substitute Parts

Part Overview

The LS75C4D-T is a tactile switch manufactured by Citizen, classified as SPST-NO (Single Pole Single Throw - Normally Open) with a contact rating of 0.02A at 12VDC. This surface mount component features top actuation with a 0.50mm actuator height and 0.15mm switch travel. The part is currently obsolete, which necessitates identification of equivalent substitute components that maintain functional and mechanical compatibility for new designs or production continuity.

Substiute Parts

LS75C4D-T

CitizenIn Stock: 4717LS75C4D-T Datasheet

Current PartRFQ

LS75C4D4

CitizenIn Stock: 812LS75C4D4 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LS75C4D-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Circuit configuration: SPST-NO
• Switch function: Off-Mom (Momentary)
• Contact rating: 0.02A @ 12VDC
• Mounting type: Surface Mount
• Outline dimensions: 2.80mm x 1.90mm
• Actuator height: 0.50mm
• Actuator orientation: Top Actuated
• Switch travel: 0.15mm
• Termination style: SMD (SMT) Tab
• Mechanical life: 300,000 Cycles

Allowable Variation Parameters:

• Operating force: ±5gf tolerance acceptable
• Ingress protection: Enhanced ratings (IP67) are compatible
• Moisture sensitivity level: Higher MSL ratings acceptable
• Product status: Active status preferred for availability

The substitute part LS75C4D4 meets all mandatory matching parameters and represents a direct functional equivalent with enhanced environmental protection specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LS75C4D4

The LS75C4D4 is the direct equivalent substitute for the obsolete LS75C4D-T. Both components share identical electrical specifications, mechanical dimensions, and functional characteristics within the LS75 series from Citizen.

Compliance and Certification:

• Both parts maintain RoHS Compliance status
• Both parts carry ECCN EAR99 classification
• Both parts share identical HTSUS code 8536.50.9031

Availability Advantage: The LS75C4D4 is currently in active production status with 771 units in stock, compared to the obsolete LS75C4D-T. This ensures supply chain continuity for new designs and production requirements.

Environmental Enhancement: The LS75C4D4 provides IP67 ingress protection (dust tight, waterproof), which exceeds the unspecified ingress protection of the original part. This enhancement is compatible with all applications designed for the LS75C4D-T and provides additional environmental robustness.

Handling Consideration: The LS75C4D4 carries MSL 2A (4 weeks) moisture sensitivity, compared to MSL 1 (unlimited) for the original part. Standard SMD handling procedures for MSL 2A components must be observed during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can LS75C4D4 be used as a direct replacement for LS75C4D-T in existing designs?

A: Yes. The LS75C4D4 is functionally and mechanically equivalent. All electrical parameters, circuit configuration, contact ratings, mounting dimensions, and actuator specifications are identical. The substitute part can be used without design modifications.

Q: What is the difference in operating force between these parts?

A: The LS75C4D-T specifies 240gf operating force, while the LS75C4D4 specifies 245gf. This 5gf difference is within normal manufacturing tolerance for tactile switches and does not affect functional compatibility or user experience in momentary switch applications.

Q: Does the IP67 rating on LS75C4D4 affect compatibility?

A: No. The IP67 ingress protection rating on the LS75C4D4 represents an enhancement over the unspecified ingress protection of the LS75C4D-T. Enhanced environmental protection is compatible with all applications designed for the original part and provides additional robustness in humid or wet environments.

Q: What does MSL 2A mean for the LS75C4D4?

A: MSL 2A indicates Moisture Sensitivity Level 2A with a floor life of 4 weeks. This means the component must be stored in a dry environment and used within 4 weeks of opening the original packaging. Standard SMD moisture control procedures (desiccant storage, baking if necessary) apply. The original LS75C4D-T with MSL 1 has unlimited floor life.

Q: Are both parts RoHS compliant?

A: Yes. Both LS75C4D-T and LS75C4D4 are RoHS Compliant and carry identical ECCN EAR99 and HTSUS classifications.

Q: Why is the LS75C4D-T listed as obsolete?

A: The LS75C4D-T has been discontinued by Citizen. The LS75C4D4 is the active production equivalent that replaces it in the product line.

Q: What are the PCB footprint requirements for LS75C4D4?

A: The LS75C4D4 maintains the identical 2.80mm x 1.90mm outline dimensions and SMD (SMT) Tab termination style as the LS75C4D-T. Existing PCB designs require no modification.

Q: Can these parts be used interchangeably in production?

A: Yes. The LS75C4D4 can be substituted for LS75C4D-T in production without design changes, BOM modifications, or assembly procedure adjustments. Standard SMD assembly processes apply to both parts.