12PSB Equivalent & Substitute Parts Reference

Part Overview

The 12PSB is an incandescent lamp designed for telephone slide applications, featuring a clear T-2 lens with a round flat top configuration and 12V voltage rating. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain system functionality and ensure continued availability for replacement and new designs.

Substiute Parts

12PSB

JKL Components Corp.In Stock: 84612PSB Datasheet

Current PartRFQ

SM1250G

JKL Components Corp.In Stock: 808SM1250G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 12PSB is based on the following critical parameters that must align for functional compatibility:

Mandatory Matching Parameters:

• Voltage Rating: 12V
• Type: Incandescent
• Color: Clear
• Lead Style: Telephone Slide Base configuration

Allowable Variation Parameters:

• Lens Style: Round with Domed Top (RT-2) is acceptable as a functional substitute for Round with Flat Top (T-2) in telephone slide applications
• Lens Size: RT-2 accommodates the same mounting envelope as T-2
• MSCP: Variation from 0.5 to 0.16 is permissible based on application requirements
• Base Product Number: Substitutes may use different base designations while maintaining electrical and mechanical compatibility

The SM1250G meets all mandatory parameters and represents an active equivalent part suitable for replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The SM1250G is the designated manufacturer-recommended substitute for the obsolete 12PSB. Selection of this part is supported by:

• Active product status ensuring ongoing availability and supply chain continuity
• Identical voltage rating and incandescent type maintaining electrical compatibility
• Matching color specification and moisture sensitivity classification
• Equivalent regulatory compliance (REACH Unaffected, EAR99 classification)
• RoHS3 compliance providing additional environmental standards adherence
• Telephone slide base configuration suitable for the same mounting applications

The transition from T-2 to RT-2 lens geometry and the reduction in MSCP from 0.5 to 0.16 represent acceptable design variations within telephone slide lamp applications. The Liliput T6.8 base specification maintains mechanical compatibility with standard telephone slide mounting interfaces.

Frequently Asked Questions (FAQ)

Q: Can SM1250G directly replace 12PSB in existing designs? A: Yes. Both parts share identical voltage rating, incandescent type, clear color, and telephone slide base configuration. The lens geometry change from T-2 flat top to RT-2 domed top and MSCP reduction are compatible with telephone slide applications.

Q: What is the significance of the MSCP difference between 12PSB and SM1250G? A: MSCP (Mean Spherical Candle Power) measures luminous intensity. The 12PSB provides 0.5 MSCP while SM1250G provides 0.16 MSCP. This reduction reflects the different lens geometries and is acceptable for telephone slide indicator lamp applications where absolute brightness is not the primary design constraint.

Q: Are there packaging differences between these parts? A: The 12PSB is supplied with standard packaging, while SM1250G is supplied in Box packaging. Both maintain identical moisture sensitivity classification (MSL 1 - Unlimited).

Q: Why is 12PSB classified as obsolete? A: Obsolete status indicates the part is no longer manufactured. SM1250G represents the active equivalent part from the same manufacturer, ensuring design continuity and component availability.

Q: Do both parts meet the same regulatory requirements? A: Yes. Both parts are REACH Unaffected and classified as EAR99 under export control regulations. SM1250G additionally carries RoHS3 compliance certification.