SPA6191 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The SPA6191 is a Solid State Relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with 1A load current capacity and 20-280V AC output voltage range. This component features a 4-SIP through-hole package with PC pin termination and zero-cross switching capability for AC loads.

The SPA6191 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and repairs.

Substiute Parts

SPA6191

Sensata-CrydomIn Stock: 4994SPA6191 Datasheet

Current PartRFQ

ASO241

Sensata-CrydomIn Stock: 1255ASO241 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPA6191 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Output Type: Must support AC with zero-cross switching for compatible load control
• Load Voltage Range: Must encompass or exceed the 20-280V specification
• Load Current: Must meet or exceed 1A rating
• Package / Case: Must be 4-SIP to ensure PCB footprint compatibility
• Mounting Type: Must be Through Hole for mechanical compatibility
• Termination Style: Must be PC Pin for electrical connection compatibility

The ASO241 meets all substitution criteria. It maintains identical circuit configuration, output type, package, mounting type, and termination style. The ASO241 provides enhanced specifications with 1.5A load current capacity and 12-280V load voltage range, making it a direct functional substitute with improved current handling capability.

Parameter Comparison

Engineering Selection Recommendations

The ASO241 is the qualified substitute for the SPA6191 based on the following engineering criteria:

Functional Equivalence: The ASO241 maintains identical circuit topology (SPST-NO), output switching characteristics (AC, zero-cross), package form factor (4-SIP), and electrical interface (PC pin termination). These parameters ensure direct functional replacement without circuit redesign.

Performance Enhancement: The ASO241 provides 1.5A load current capacity compared to the SPA6191's 1A rating, offering improved current handling margin. The load voltage range (12-280V) encompasses the SPA6191 specification (20-280V), ensuring compatibility across all intended operating conditions.

Supply Chain Status: The SPA6191 is obsolete with no active production. The ASO241 is an active product with current manufacturing support, ensuring long-term availability for procurement and replacement applications.

Compliance: The ASO241 is RoHS3 compliant and REACH affected, meeting current regulatory requirements for electronic components in most jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can the ASO241 be used as a direct replacement for the SPA6191 without PCB modifications?

A: Yes. The ASO241 maintains identical package geometry (4-SIP), pin configuration (PC pin termination), and mounting type (through-hole). No PCB layout changes are required for mechanical or electrical compatibility.

Q: What are the key differences between the SPA6191 and ASO241?

A: The primary differences are product status (SPA6191 is obsolete; ASO241 is active), load current rating (1A vs. 1.5A), and minimum load voltage (20V vs. 12V). The ASO241 provides enhanced specifications while maintaining identical switching characteristics and package form factor.

Q: Is the ASO241 suitable for applications requiring exactly 1A load current?

A: Yes. The ASO241's 1.5A rating exceeds the 1A requirement, providing operational margin. The component will function correctly in circuits designed for 1A loads.

Q: Are there any input voltage differences between these parts?

A: The SPA6191 input voltage specification is not provided in the available data. The ASO241 specifies 4-10VDC input. Verify input voltage compatibility with your application requirements.

Q: What is the significance of the zero-cross switching feature?

A: Zero-cross switching ensures the relay activates only when the AC voltage waveform crosses zero, reducing electromagnetic interference and switching stress on AC loads. Both the SPA6191 and ASO241 incorporate this feature.

Q: Can the ASO241 be used in legacy systems originally designed with the SPA6191?

A: Yes, provided the application operates within the ASO241's specified load voltage range (12-280V) and current requirements (≤1.5A). The identical package and switching characteristics ensure compatibility with existing circuit designs.