ISC1210ER3R3K Equivalent & Substitute Parts

Part Overview

The ISC1210ER3R3K is a 3.3 µH shielded drum core wirewound inductor manufactured by Vishay Dale, designed for surface mount applications in the 1210 (3225 Metric) package. This component operates at 270 mA maximum current with 1.1Ohm maximum DC resistance and is rated for -55°C to 125°C operating temperature. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or supply chain considerations.

Substiute Parts

ISC1210ER3R3K

Vishay DaleIn Stock: 1050ISC1210ER3R3K Datasheet

Current PartRFQ

CMH322522-3R3KL

Bourns Inc.In Stock: 4535CMH322522-3R3KL Datasheet

DirectRFQ

74476403

Würth ElektronikIn Stock: 330774476403 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISC1210ER3R3K are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 3.3 µH (±10% tolerance maintained)
• Package / Case: 1210 (3225 Metric) surface mount
• Current Rating: minimum 260 mA (within 96% of original 270 mA specification)
• DC Resistance: maximum 1.2Ohm (within acceptable operating margin)
• Operating Temperature Range: -55°C to 125°C minimum
• Shielding configuration: Shielded or Unshielded (application-dependent)
• Core Material: Iron Powder or Ferrite (both acceptable for equivalent inductance performance)
• Frequency Test: 7.96 MHz (standard measurement frequency)
• RoHS3 Compliance: Required

Substitution Logic: The ISC1210ER3R3K can be substituted with parts meeting all primary criteria. Current rating variance of 10 mA (270 mA to 260 mA) and DC resistance increase of 0.1Ohm (1.1Ohm to 1.2Ohm) remain within acceptable engineering tolerances for this inductor category. Shielding differences are noted for applications requiring electromagnetic isolation. Core material differences (Iron Powder vs. Ferrite) do not affect the specified electrical performance at the test frequency.

Parameter Comparison

Engineering Selection Recommendations

CMH322522-3R3KL (Bourns Inc.) qualifies as a direct substitute for the ISC1210ER3R3K. Both parts maintain identical inductance, tolerance, frequency test parameters, and operating temperature range. The 10 mA current rating reduction and 0.1Ohm DC resistance increase are within acceptable margins. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited), indicating equivalent moisture sensitivity handling. Shielding is maintained in both designs. Ferrite core material in the Bourns part provides equivalent performance at the specified test frequency.

74476403 (Würth Elektronik) is a qualified substitute with the following considerations: Electrical parameters (inductance, tolerance, current rating, DC resistance, Q factor, and frequency test) are equivalent. The part is ROHS3 compliant. However, this part is unshielded, which may affect electromagnetic compatibility in applications requiring shielding. Operating temperature range is reduced to -40°C to 105°C, which does not cover the full -55°C lower limit of the original part. MSL rating is 3 (168 Hours), requiring stricter moisture control during storage and assembly compared to MSL 1 parts.

Selection between substitutes depends on application requirements for shielding and operating temperature range. Both substitutes are Active status products with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CMH322522-3R3KL replace ISC1210ER3R3K in all applications?

A: CMH322522-3R3KL is electrically and mechanically compatible with ISC1210ER3R3K for applications operating within -55°C to 125°C and requiring shielded inductors. The 10 mA current rating difference (260 mA vs. 270 mA) and 0.1Ohm DC resistance increase are within acceptable engineering tolerances for this component category.

Q: What is the difference between shielded and unshielded inductors?

A: Shielded inductors (ISC1210ER3R3K and CMH322522-3R3KL) contain electromagnetic shielding to minimize radiated emissions and susceptibility to external magnetic fields. Unshielded inductors (74476403) do not include this shielding. Selection depends on circuit layout and electromagnetic compatibility requirements.

Q: Is 74476403 suitable as a substitute?

A: 74476403 meets electrical specifications for inductance, tolerance, current rating, and DC resistance. However, it is unshielded and has a reduced operating temperature range (-40°C to 105°C vs. -55°C to 125°C). Use this part only in applications that do not require the full temperature range or shielding characteristics of the original part.

Q: What does MSL rating mean for these inductors?

A: Moisture Sensitivity Level (MSL) indicates moisture absorption limits during storage and assembly. MSL 1 (Unlimited) parts like ISC1210ER3R3K and CMH322522-3R3KL have no moisture-related storage restrictions. MSL 3 (168 Hours) parts like 74476403 must be used within 168 hours of package opening or require baking before assembly.

Q: Are all three parts ROHS3 compliant?

A: Yes. ISC1210ER3R3K, CMH322522-3R3KL, and 74476403 are all ROHS3 compliant, meeting hazardous substance restrictions for electronic components.

Q: Can I use these inductors interchangeably on the same PCB?

A: All three parts use the 1210 (3225 Metric) surface mount package with identical footprint dimensions (0.126" L x 0.098" W / 3.20mm x 2.49-2.50mm). Physical placement is interchangeable. Electrical performance differences (shielding, core material, temperature range) must be evaluated for specific circuit requirements.