LBA127LSTR Equivalent & Substitute Parts

Part Overview

The LBA127LSTR is an IXYS Integrated Circuits Division solid state relay featuring SPST-NO + SPST-NC (1 Form A and B) configuration in 8-SMD surface mount packaging. This OptoMOS® series component operates with 1.2VDC input and supports load voltages from 0V to 250V at 150mA maximum load current. The part is Active status and RoHS3 compliant, designed for applications requiring dual-channel relay functionality in compact surface mount form factors. Equivalent parts are identified based on matching circuit topology, package geometry, and electrical performance within specified operating ranges.

Substiute Parts

LBA127LSTR

IXYS Integrated Circuits DivisionIn Stock: 3383LBA127LSTR Datasheet

Current PartRFQ

LH1512BACTR

Vishay Semiconductor Opto DivisionIn Stock: 2100LH1512BACTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LBA127LSTR is determined by the following critical parameters:

Circuit topology must match: SPST-NO + SPST-NC (1 Form A and B) configuration is mandatory for functional equivalence.

Package geometry must be identical: 8-SMD (0.300", 7.62mm) with Gull Wing termination ensures PCB compatibility without layout redesign.

Input voltage compatibility: Substitute parts must accept the 1.2VDC control signal within specified input voltage ranges.

Load voltage and current ratings: Substitute parts must support the application's load voltage (0V ~ 250V) and current requirements (150mA maximum).

Output type: AC and DC output capability must be maintained.

Surface mount mounting type is required for board-level integration.

Active product status and RoHS3 compliance ensure long-term availability and regulatory alignment.

The LH1512BACTR from Vishay Semiconductor Opto Division qualifies as a substitute based on matching circuit configuration, identical package geometry, compatible input voltage (1.26VDC), and surface mount termination. While the LH1512BACTR supports higher load current (200mA) and lower on-state resistance (10 Ohms), its maximum load voltage specification (0V ~ 200V) represents a constraint relative to the LBA127LSTR's 250V rating.

Parameter Comparison

Engineering Selection Recommendations

Both the LBA127LSTR and LH1512BACTR are Active status components with ROHS3 compliance and unlimited moisture sensitivity ratings, supporting long-term design continuity and regulatory requirements.

The LBA127LSTR is the primary selection when load voltages approach or exceed 200V, as its 250V maximum load voltage specification provides margin for high-voltage applications.

The LH1512BACTR is suitable for applications where load voltage remains below 200V and where the improved on-state resistance (10 Ohms versus 15 Ohms) and higher current capacity (200mA versus 150mA) provide operational advantages. The LH1512BACTR's lower on-state resistance reduces power dissipation in the relay element.

Both parts share identical package geometry, termination style, and circuit configuration, eliminating PCB layout modifications during substitution.

Input voltage specifications are compatible within normal circuit tolerance ranges (1.2VDC versus 1.26VDC).

Frequently Asked Questions (FAQ)

Q: Can the LH1512BACTR replace the LBA127LSTR in all applications?

A: The LH1512BACTR is functionally equivalent for applications where the load voltage does not exceed 200V. If your application requires load voltages between 200V and 250V, the LBA127LSTR is the required selection. Both parts share identical package geometry and circuit topology, so PCB compatibility is maintained.

Q: What is the significance of the 8-SMD (0.300", 7.62mm) package specification?

A: This specification defines the physical footprint and lead spacing for surface mount assembly. Both the LBA127LSTR and LH1512BACTR use this identical package geometry, ensuring direct PCB compatibility without layout redesign or requalification.

Q: Are there differences in input voltage requirements between these parts?

A: The LBA127LSTR operates at 1.2VDC input, while the LH1512BACTR operates at 1.26VDC input. These specifications are compatible within standard circuit design tolerances and do not require control signal modifications.

Q: How do the on-state resistance values affect component selection?

A: On-state resistance determines power dissipation across the relay element during conduction. The LH1512BACTR's lower on-state resistance (10 Ohms) generates less heat than the LBA127LSTR (15 Ohms) at equivalent load currents. This becomes significant in high-current or thermally constrained applications.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance certifies that the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. Both parts carry this certification, supporting regulatory compliance in regulated markets.

Q: Can these relays handle both AC and DC loads?

A: Yes. Both the LBA127LSTR and LH1512BACTR support AC and DC output types, providing flexibility for diverse load applications.