LH1523BB Equivalent & Substitute Parts

Part Overview

The LH1523BB is a solid-state relay (SSR) manufactured by Vishay Semiconductor Opto Division, configured as a SPST-NC (1 Form B) dual-channel device in an 8-DIP package. This component is designed for switching applications requiring 200 mA load current across 0–200 V AC/DC loads with a 1.22 VDC input trigger. The LH1523BB is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

LH1523BB

Vishay Semiconductor Opto DivisionIn Stock: 3267LH1523BB Datasheet

Current PartRFQ

LBB127

IXYS Integrated Circuits DivisionIn Stock: 1878LBB127 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LH1523BB is determined by strict equivalence across the following critical parameters:

• Circuit configuration: SPST-NC (1 Form B) x 2 channels
• Package type: 8-DIP (0.300", 7.62mm) with PC Pin termination
• Load current rating: 200 mA minimum
• Input voltage: 1.2 VDC or lower (lower input voltage ensures compatibility)
• Load voltage range: Must support 0–200 V minimum
• Output type: AC/DC switching capability
• On-state resistance: 10 Ohms maximum
• Mounting: Through-hole configuration

The LBB127 manufactured by IXYS Integrated Circuits Division meets all substitution criteria. This part maintains identical circuit topology, package footprint, and electrical performance specifications while offering an extended load voltage range (0–250 V) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LBB127 is a direct functional equivalent to the LH1523BB for applications requiring SPST-NC solid-state relay switching at 200 mA load current. Selection of the LBB127 is supported by the following factors:

• Identical electrical performance across all critical switching parameters
• Identical mechanical footprint and through-hole pin configuration enabling direct PCB substitution
• Active product status ensures long-term availability and supply chain continuity
• Extended load voltage range (250 V vs. 200 V) provides additional design margin for applications operating near maximum voltage limits
• ROHS3 compliance maintained across both parts
• Equivalent regulatory classification (EAR99, HTSUS 8536.41.0030)

Frequently Asked Questions (FAQ)

Q: Can the LBB127 be used as a direct replacement for the LH1523BB on existing PCBs?

A: Yes. The LBB127 maintains identical 8-DIP (0.300", 7.62mm) package dimensions, PC Pin termination, and through-hole mounting configuration. No PCB modifications are required.

Q: What is the significance of the extended load voltage range in the LBB127?

A: The LBB127 supports 0–250 V load voltage compared to the LH1523BB's 0–200 V range. This extended specification provides additional operational margin and does not affect compatibility with applications designed for the original 0–200 V specification.

Q: Are input voltage differences between the two parts significant?

A: No. The LBB127 input voltage specification (1.2 VDC) is lower than the LH1523BB (1.22 VDC), meaning the LBB127 triggers at a slightly lower input threshold. This represents improved sensitivity and maintains full compatibility with existing drive circuits.

Q: What is the impact of the LH1523BB's obsolete status?

A: Obsolete status indicates the part is no longer manufactured by Vishay. The LBB127, classified as active, is currently produced by IXYS and represents the recommended path for new designs and ongoing system support.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and identical ECCN/HTSUS classifications, ensuring equivalent regulatory acceptance.