SG210 Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The SG210 is an inrush current limiter manufactured by Ametherm, part of the SURGE-GARD™ series. This component is designed to limit inrush current in power supply circuits and related applications. The device features a resistance of 7 Ohms at 25°C with ±15% tolerance and supports a steady-state maximum current of 4 A. The SG210 maintains Active product status and is ROHS3 compliant with CSA and UR approvals. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within specified parameter ranges.

Substiute Parts

SG210

AmethermIn Stock: 865SG210 Datasheet

Current PartRFQ

B57238S0709M000

EPCOS - TDK ElectronicsIn Stock: 1764B57238S0709M000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The B57238S0709M000 from EPCOS - TDK Electronics is identified as a substitute based on the following substitution criteria:

Core Electrical Parameters (Primary Substitution Basis):

• Resistance value: Both parts rated at 7 Ohms
• Tolerance: SG210 ±15% vs. B57238S0709M000 ±20% (wider tolerance acceptable for substitution)
• Steady-state current capability: SG210 4 A vs. B57238S0709M000 6 A (higher rating provides margin)

Mechanical Compatibility:

• Package form factor: Both are cylindrical inrush current limiters with similar lead configurations
• Diameter: SG210 0.600" vs. B57238S0709M000 0.630" (minor dimensional difference within typical PCB layout tolerance)
• Lead spacing: SG210 0.310" vs. B57238S0709M000 0.295" (compatible with standard 0.300" pitch applications)

Compliance & Regulatory:

• Both parts are ROHS3 compliant
• Both carry REACH Unaffected status
• Both classified under HTSUS 8533.40.8070

Parameter Comparison

Engineering Selection Recommendations

Both the SG210 and B57238S0709M000 maintain Active product status and meet current regulatory requirements. The B57238S0709M000 provides equivalent 7 Ohm resistance with higher steady-state current capability (6 A vs. 4 A), making it suitable for applications requiring additional thermal margin. Both components carry ROHS3 compliance and REACH Unaffected designation, ensuring compatibility with current environmental regulations. The wider tolerance specification of the B57238S0709M000 (±20% vs. ±15%) should be evaluated against circuit design requirements for resistance accuracy.

Frequently Asked Questions (FAQ)

Q: Can the B57238S0709M000 directly replace the SG210 in existing designs?

A: The B57238S0709M000 is electrically equivalent at the core specification level (7 Ohm resistance, same steady-state current class). Mechanical fit should be verified due to minor dimensional differences: the B57238S0709M000 has a 0.630" diameter versus the SG210's 0.600" diameter. Lead spacing differs by 0.015" (0.310" vs. 0.295"), which may require PCB layout verification for tight pitch applications.

Q: What is the significance of the tolerance difference between these parts?

A: The SG210 specifies ±15% tolerance while the B57238S0709M000 specifies ±20%. For applications requiring tighter resistance accuracy, the SG210 is preferred. For applications where ±20% tolerance is acceptable, the B57238S0709M000 provides equivalent performance.

Q: Why does the B57238S0709M000 have a higher current rating?

A: The B57238S0709M000 is rated for 6 A steady-state maximum current compared to the SG210's 4 A. This higher rating provides additional thermal margin and may indicate different thermal design characteristics between the two components. Both are suitable for 4 A applications; the B57238S0709M000 offers additional capacity for higher-current designs.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the SG210 and B57238S0709M000 are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What should be considered when selecting between these two parts?

A: Selection should be based on: (1) PCB layout constraints relative to the 0.030" diameter difference and 0.015" lead spacing difference; (2) resistance tolerance requirements for the specific circuit application; (3) thermal design margin needs relative to the 4 A vs. 6 A current ratings; (4) component availability and lead time from respective manufacturers.