SSR21NH-M20125 Equivalent & Substitute Parts

Part Overview

The SSR21NH-M20125 is a 2-line common mode choke (CMC) manufactured by KEMET, designed for through-hole mounting applications. This component operates at 12.5 mH inductance at 10 kHz with a maximum current rating of 2A and DC resistance of 160 mOhm. The part is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design revisions, or application-specific requirements within the allowed parameter ranges.

Key Parameters

Parameter	Value
Manufacturer	KEMET
Series	SSR
Number of Lines	2
Inductance @ Frequency	12.5 mH @ 10 kHz
Current Rating (Max)	2A
DC Resistance (Max)	160 mOhm
Voltage Rating - AC	250V
Operating Temperature Range	-25°C ~ 120°C
Mounting Type	Through Hole
Package / Case	Vertical, 4 PC Pin
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SSR21NH-M20125 are grouped based on the following substitution criteria:

Group 1: Identical Electrical Parameters

Inductance: 12.5 mH @ 10 kHz
Current Rating: 2A
DC Resistance: 160 mOhm
Voltage Rating: 250V AC
Operating Temperature: -25°C ~ 120°C
Number of Lines: 2
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Group 2: Reduced Inductance Variants

Inductance: 10.3 mH @ 10 kHz
Current Rating: 2A
DC Resistance: 150 mOhm (lower than main part)
Voltage Rating: 250V AC
Operating Temperature: -25°C ~ 120°C
Number of Lines: 2
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Substitution is permitted when the application tolerates inductance variation within the specified ranges and when mechanical footprint compatibility is confirmed. All substitute parts maintain identical electrical ratings for current, voltage, and temperature operation.

Parameter Comparison

Parameter	SSR21NH-M20125	SSR21NV-M20125	SSR21NHS-M20103	SSR21NVS-M20103
Manufacturer	KEMET	KEMET	KEMET	KEMET
Series	SSR	SSR	SSR	SSR
Number of Lines	2	2	2	2
Inductance @ Frequency	12.5 mH @ 10 kHz	12.5 mH @ 10 kHz	10.3 mH @ 10 kHz	10.3 mH @ 10 kHz
Current Rating (Max)	2A	2A	2A	2A
DC Resistance (Max)	160 mOhm	160 mOhm	150 mOhm	150 mOhm
Voltage Rating - AC	250V	250V	250V	250V
Operating Temperature	-25°C ~ 120°C	-25°C ~ 120°C	-25°C ~ 120°C	-25°C ~ 120°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Vertical, 4 PC Pin	Vertical, 4 PC Pin	Vertical, 4 PC Pin	Vertical, 4 PC Pin
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original SSR21NH-M20125 specification.

For direct replacement with identical electrical characteristics: Select SSR21NV-M20125. This part provides matching inductance (12.5 mH @ 10 kHz), current rating (2A), and DC resistance (160 mOhm). The primary difference is mechanical footprint: SSR21NV-M20125 measures 0.866" L x 0.630" W x 1.063" H, compared to SSR21NH-M20125 at 0.906" L x 0.906" W x 0.571" H. Footprint compatibility must be confirmed before selection.

For applications tolerating reduced inductance: Select SSR21NHS-M20103 or SSR21NVS-M20103. Both parts operate at 10.3 mH @ 10 kHz with improved DC resistance (150 mOhm versus 160 mOhm). SSR21NHS-M20103 maintains the original footprint (0.906" L x 0.906" W x 0.571" H). SSR21NVS-M20103 uses the alternate footprint (0.866" L x 0.630" W x 1.063" H). Selection depends on inductance tolerance requirements and available board space.

All substitute parts are manufactured by KEMET within the SSR series, operate across the identical temperature range (-25°C ~ 120°C), and maintain 250V AC voltage rating.

Frequently Asked Questions (FAQ)

Q: Can SSR21NV-M20125 be used as a direct replacement for SSR21NH-M20125?

A: SSR21NV-M20125 provides identical electrical performance (12.5 mH @ 10 kHz, 2A, 160 mOhm DCR). However, the mechanical footprint differs. SSR21NH-M20125 is 0.906" x 0.906" x 0.571" (height), while SSR21NV-M20125 is 0.866" x 0.630" x 1.063" (height). Board layout compatibility must be verified before substitution.

Q: What is the difference between the 12.5 mH and 10.3 mH variants?

A: The inductance value differs at 10 kHz operating frequency. SSR21NH-M20125 and SSR21NV-M20125 provide 12.5 mH, while SSR21NHS-M20103 and SSR21NVS-M20103 provide 10.3 mH. The 10.3 mH variants also feature lower DC resistance (150 mOhm versus 160 mOhm). Selection depends on circuit inductance requirements and acceptable tolerance ranges.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SSR21NV-M20125, SSR21NHS-M20103, and SSR21NVS-M20103 are all ROHS3 compliant, matching the compliance status of SSR21NH-M20125.

Q: What is the difference between SSR21NHS-M20103 and SSR21NVS-M20103?

A: Both parts provide identical electrical specifications (10.3 mH @ 10 kHz, 2A, 150 mOhm DCR). The difference is mechanical footprint. SSR21NHS-M20103 measures 0.906" L x 0.906" W x 0.571" H (matching the original SSR21NH-M20125 footprint). SSR21NVS-M20103 measures 0.866" L x 0.630" W x 1.063" H (matching the SSR21NV-M20125 footprint). Selection is based on available board space and mounting constraints.

Q: Can these parts operate at temperatures outside -25°C to 120°C?

A: No. All listed parts, including the main part and substitutes, are rated for operation within -25°C to 120°C. Operation outside this range is not supported.

Q: Are all parts available in bulk packaging?

A: Yes. SSR21NH-M20125 (1147 pcs), SSR21NV-M20125 (1298 pcs), SSR21NHS-M20103 (1140 pcs), and SSR21NVS-M20103 (1087 pcs) are all available in bulk packaging with current inventory levels as specified.

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