Littelfuse XBA170 Equivalent & Substitute Parts

Part Overview

The Littelfuse XBA170 is a solid-state relay (SSR) featuring SPST-NO + SPST-NC configuration in an 8-DIP package. This OptoMOS® device is designed for switching applications up to 350V with a 100mA load capacity and operates on 1.2VDC input. The XBA170 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the same functional circuit topology, package form factor, and voltage specifications while offering improved availability and performance characteristics.

Substiute Parts

XBA170

LittelfuseIn Stock: 811XBA170 Datasheet

Current PartRFQ

AQW610EH

Panasonic Electric WorksIn Stock: 30403AQW610EH Datasheet

MFR RecommendedRFQ

LH1502BB

Vishay Semiconductor Opto DivisionIn Stock: 1481LH1502BB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the XBA170 is determined by the following criteria:

Mandatory Compatibility Parameters:

• Circuit configuration must be SPST-NO + SPST-NC (1 Form A and B)
• Package must be 8-DIP (0.300", 7.62mm)
• Load voltage range must encompass 0 V ~ 350 V
• Output type must support both AC and DC
• Termination style must be PC Pin
• Mounting type must be Through Hole

Performance Parameters:

• Input voltage must be compatible with 1.2VDC nominal operation
• Load current rating must meet or exceed 100 mA minimum requirement
• On-state resistance should be optimized for switching efficiency

The identified substitutes (AQW610EH and LH1502BB) satisfy all mandatory compatibility parameters while offering enhanced electrical performance through higher load current ratings and reduced on-state resistance.

Parameter Comparison

Engineering Selection Recommendations

AQW610EH (Panasonic Electric Works PhotoMOS™ AQW): This substitute offers active product status with ROHS3 compliance. The 1.14VDC input voltage is within acceptable tolerance of the XBA170 specification. Load current capability of 120mA exceeds the 100mA requirement, and on-state resistance of 25 Ohms provides improved switching efficiency compared to the original 50 Ohms. Panasonic's PhotoMOS™ technology provides established reliability in industrial switching applications.

LH1502BB (Vishay Semiconductor Opto Division LH1502): This substitute provides active product status with ROHS3 compliance and MSL rating matching the original XBA170. The 1.26VDC input voltage remains within acceptable operating range. Load current capability of 150mA and on-state resistance of 20 Ohms represent the highest performance specifications among available substitutes. Vishay's LH1502 series is widely deployed in high-reliability switching applications.

Both substitutes maintain full electrical and mechanical compatibility with the XBA170 while offering improved performance metrics and active manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can the AQW610EH or LH1502BB be used as direct replacements for the XBA170 in existing PCB designs?

A: Yes. Both substitutes share identical 8-DIP package dimensions (0.300", 7.62mm), PC Pin termination, and through-hole mounting. Pin-to-pin compatibility is maintained for the SPST-NO + SPST-NC circuit configuration. No PCB layout modifications are required.

Q: What are the input voltage compatibility considerations?

A: The XBA170 operates at 1.2VDC nominal input. The AQW610EH operates at 1.14VDC and the LH1502BB at 1.26VDC. Both substitutes fall within standard engineering tolerance for solid-state relay input specifications and are compatible with 1.2VDC drive circuits.

Q: How do the load current ratings affect component selection?

A: The XBA170 is rated for 100mA maximum load current. The AQW610EH provides 120mA and the LH1502BB provides 150mA. Both substitutes exceed the original specification, allowing operation at the original 100mA load level with additional margin. Applications requiring higher current switching benefit from the enhanced ratings.

Q: What is the significance of on-state resistance differences?

A: The XBA170 specifies 50 Ohms maximum on-state resistance. The AQW610EH provides 25 Ohms and the LH1502BB provides 20 Ohms. Lower on-state resistance reduces power dissipation during switching, improving thermal performance and efficiency. Both substitutes provide superior characteristics.

Q: Are there compliance or regulatory differences between the options?

A: The AQW610EH and LH1502BB both carry ROHS3 compliance certification, meeting current environmental regulations. The XBA170 status is not specified for RoHS. All three parts maintain REACH Unaffected status. For new designs subject to RoHS requirements, the active substitutes are preferred.

Q: What is the product status significance?

A: The XBA170 is classified as obsolete, indicating discontinued manufacturing and limited future availability. Both AQW610EH and LH1502BB maintain active product status with established supply chains and ongoing manufacturing support, ensuring long-term component availability for production and maintenance applications.