SSA-250 Current Sensor Equivalent & Substitute Parts

Part Overview

The Riedon SSA-250 is an isolated current sensor module designed for DC current measurement applications up to 250A. This single-channel shunt-based sensor provides ratiometric voltage output with bidirectional measurement capability and chassis mount configuration. The SSA-250 carries a "Not For New Designs" product status, indicating that alternative solutions should be evaluated for new development projects. Identifying equivalent and substitute parts is necessary to ensure design continuity, improve product availability, and access active product lines with enhanced specifications.

Substiute Parts

SSA-250

RiedonIn Stock: 798SSA-250 Datasheet

Current PartRFQ

SSA2-250

RiedonIn Stock: 868SSA2-250 Datasheet

SimilarRFQ

SSA-100

RiedonIn Stock: 1282SSA-100 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSA-250 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Current sensing range (250A nominal rating)
• Single channel configuration
• Shunt sensor type
• Ratiometric voltage output
• Bidirectional measurement capability
• Chassis mount form factor
• Module package type
• Supply voltage compatibility (3V ~ 5.5V)
• Frequency response (300kHz)
• Linearity and accuracy specifications

Substitution Categories:

Direct Equivalent (Same Current Rating): The SSA2-250 provides identical 250A current sensing with enhanced specifications including AC/DC measurement capability and extended operating temperature range, while maintaining the same output characteristics and mounting configuration.

Parametric Equivalent (Reduced Current Rating): The SSA-100 operates within the same electrical and mechanical framework as the SSA-250 but with a 100A current sensing limit. This part is suitable for applications requiring lower current measurement ranges while preserving all other functional parameters.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Current Rating):

The SSA2-250 is the recommended substitute for new designs and ongoing production. This part maintains identical current sensing capability (250A) and mechanical compatibility while offering an active product status. The SSA2-250 extends measurement capability to AC/DC operation compared to the SSA-250's DC-only specification. The operating temperature range extends to 125°C, providing enhanced thermal performance for demanding applications. Accuracy specification is ±0.2% compared to ±0.1% for the SSA-250; this difference is within acceptable tolerance for most industrial current sensing applications. All other electrical parameters, including supply voltage, frequency response, response time, and output characteristics, remain identical.

For Current Range Reduction:

The SSA-100 provides a parametric equivalent solution for applications requiring measurement of currents up to 100A. This part maintains all core electrical and mechanical characteristics of the SSA-250 platform, including identical supply voltage, frequency response, response time, and accuracy specifications. The SSA-100 is suitable for lower-current measurement scenarios where the full 250A range is not required. Both the SSA-250 and SSA-100 carry "Not For New Designs" status; however, the SSA-100 remains available with substantial inventory.

Compliance Considerations:

All three parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility across industrial and commercial applications. Moisture sensitivity level (MSL) is rated at 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can the SSA2-250 directly replace the SSA-250 in existing designs?

A: Yes. The SSA2-250 maintains identical mechanical mounting (chassis mount module configuration) and electrical interface (3V ~ 5.5V supply, ratiometric voltage output). The primary differences are product status (Active vs. Not For New Designs), measurement capability (AC/DC vs. DC only), and operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). Accuracy differs by 0.1% (±0.2% vs. ±0.1%), which is typically acceptable for current sensing applications.

Q: Is the SSA-100 suitable as a substitute for the SSA-250?

A: The SSA-100 is a parametric equivalent only for applications measuring currents up to 100A. It cannot replace the SSA-250 in systems requiring the full 250A measurement range. All other electrical parameters (supply voltage, output type, response time, frequency response) are identical, making it suitable for lower-current applications within the same design framework.

Q: What are the key differences between SSA and SSA2 series?

A: The SSA2 series represents an enhanced product line with active status. The SSA2-250 adds AC/DC measurement capability compared to DC-only operation in the SSA-250. The SSA2 series also extends the operating temperature range to 125°C. Both series maintain identical current sensing ranges, output characteristics, and mounting configurations.

Q: Are there any supply voltage compatibility issues when substituting these parts?

A: No. All three parts (SSA-250, SSA2-250, and SSA-100) operate within the identical supply voltage range of 3V ~ 5.5V. No circuit modifications are required for voltage supply compatibility.

Q: What is the significance of the "Not For New Designs" status?

A: This status indicates that the SSA-250 and SSA-100 are mature products no longer recommended for new development projects. Riedon recommends using the SSA2-250 (Active status) for new designs to ensure long-term product availability and access to enhanced specifications.

Q: Do these parts require different mounting procedures?

A: No. All three parts use identical chassis mount configuration and module package type. Mechanical installation procedures remain unchanged across SSA-250, SSA2-250, and SSA-100.

Q: How does the accuracy specification difference affect system performance?

A: The SSA2-250 specifies ±0.2% accuracy compared to ±0.1% for the SSA-250. This 0.1% difference represents a relative accuracy variation of approximately 0.25A at full 250A range. For most industrial current sensing applications, this difference falls within acceptable measurement tolerance and does not require system recalibration.