LH1523BAC Equivalent & Substitute Parts

Part Overview

The LH1523BAC 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-SMD surface mount 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 voltage. The LH1523BAC is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

LH1523BAC

Vishay Semiconductor Opto DivisionIn Stock: 2053LH1523BAC Datasheet

Current PartRFQ

LBB127P

LittelfuseIn Stock: 1783LBB127P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LH1523BAC is determined by strict alignment of the following critical parameters:

• Circuit configuration: SPST-NC (1 Form B) x 2 channels
• Output capability: AC and DC switching
• Load current rating: 200 mA minimum
• Input trigger voltage: Compatible with 1.22 VDC (±tolerance)
• Load voltage range: Minimum 0–200 V; higher ratings are acceptable
• Package type: 8-SMD surface mount with gull wing termination
• Physical dimensions: 0.300" (7.62mm) footprint compatibility
• Environmental compliance: ROHS3 and REACH compliance maintained

The LBB127P from Littelfuse meets these substitution criteria through equivalent electrical performance and identical mechanical packaging, with the exception of an extended load voltage rating (0–250 V) and different moisture sensitivity classification.

Parameter Comparison

Engineering Selection Recommendations

The LBB127P is a direct functional substitute for the obsolete LH1523BAC. Both components share identical circuit topology, load current capacity, on-state resistance, and physical packaging. The LBB127P maintains ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original design.

The LBB127P offers an extended load voltage rating of 0–250 V compared to the LH1523BAC's 0–200 V specification. This extended rating provides additional design margin for applications operating near the upper voltage boundary and does not introduce incompatibility with designs specified for 0–200 V operation.

Input trigger voltage specifications are equivalent (1.22 VDC vs. 1.2 VDC), confirming control circuit compatibility. The LBB127P is currently in active production status, ensuring long-term availability and supply chain continuity.

The moisture sensitivity level difference (MSL 1 vs. MSL 3) reflects different manufacturing and storage requirements. Applications requiring unlimited shelf life storage should account for the MSL 3 classification of the LBB127P through appropriate moisture control during component handling and storage.

Frequently Asked Questions (FAQ)

Q: Can the LBB127P directly replace the LH1523BAC in existing designs?

A: Yes. The LBB127P is mechanically and electrically compatible with the LH1523BAC. Both components use identical 8-SMD gull wing packaging, support 200 mA load current, and operate with equivalent input trigger voltages. PCB layout and footprints require no modification.

Q: What is the significance of the extended 0–250 V load voltage rating on the LBB127P?

A: The LBB127P's 0–250 V rating encompasses the LH1523BAC's 0–200 V specification. Applications designed for 0–200 V operation remain fully compatible. The extended rating provides additional voltage margin for designs operating near maximum load voltage limits.

Q: How does the MSL 3 classification of the LBB127P affect component handling?

A: MSL 3 requires moisture control during storage and handling for up to 168 hours after package opening. The LH1523BAC's MSL 1 classification permits unlimited shelf life. For applications with extended component storage periods, moisture-controlled storage conditions must be implemented for the LBB127P.

Q: Are both components RoHS and REACH compliant?

A: Yes. Both the LH1523BAC and LBB127P are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the operational difference between the 1.22 VDC and 1.2 VDC input specifications?

A: The input voltage specifications are functionally equivalent. The 0.02 VDC difference falls within standard component tolerance ranges and does not affect control circuit design or operation.