CDRH74-331MC Equivalent & Substitute Parts

Part Overview

The CDRH74-331MC is a 330 µH shielded surface mount inductor manufactured by Sumida America Components Inc., rated for 320 mA continuous current with a maximum DC resistance of 1.86 Ohm. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement continuity. The part operates across a temperature range of -40°C to 100°C and is mounted in a nonstandard 7.30mm × 7.30mm package with 4.50mm seated height.

Due to its obsolete status, equivalent and substitute inductors with matching or superior electrical characteristics are required for new production runs, redesigns, and legacy system maintenance.

Substiute Parts

CDRH74-331MC

Sumida America Components Inc.In Stock: 1216CDRH74-331MC Datasheet

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CDRH74NP-331MC-B

Sumida America Components Inc.In Stock: 5104CDRH74NP-331MC-B Datasheet

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DR74-331-R

Eaton - Electronics DivisionIn Stock: 2299DR74-331-R Datasheet

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P1167.334NLT

Pulse ElectronicsIn Stock: 3684P1167.334NLT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDRH74-331MC are classified based on strict electrical and mechanical parameter alignment:

Direct Equivalent Criteria:

• Inductance value: 330 µH (exact match required)
• Current rating: minimum 320 mA
• DC resistance: 1.86 Ohm maximum
• Shielding: shielded construction
• Mounting: surface mount
• Tolerance: ±20%
• Package footprint: compatible with 7.30mm × 7.30mm mounting area

Acceptable Variation Parameters:

• Current rating may exceed 320 mA (provides design margin)
• DC resistance may be lower than 1.86 Ohm (reduces power loss)
• Operating temperature range may exceed -40°C to 100°C (provides extended thermal margin)
• Package height may vary within PCB assembly constraints
• Inductance test frequency may differ (100 kHz vs. 1 kHz) without affecting substitution validity

Non-Negotiable Parameters:

• Inductance must remain 330 µH
• Shielding must be maintained
• Surface mount configuration must be preserved
• Tolerance must be ±20% or tighter

Parameter Comparison

Engineering Selection Recommendations

CDRH74NP-331MC-B (Direct Equivalent - Recommended Primary Choice)

The CDRH74NP-331MC-B is the direct equivalent substitute for the obsolete CDRH74-331MC. Both parts are manufactured by Sumida America Components Inc. within the same CDRH74 series and share identical electrical specifications: 330 µH inductance, 320 mA current rating, 1.86 Ohm maximum DC resistance, and matching package dimensions (7.30 × 7.30 × 4.50 mm).

The CDRH74NP-331MC-B is currently in active production status with 5025 units in stock. This part achieves ROHS3 compliance, addressing regulatory requirements that the original obsolete part does not meet. The packaging format is Tape & Reel (TR), suitable for automated assembly processes. Operating temperature range remains -40°C to 100°C, maintaining thermal compatibility with the original design.

DR74-331-R (Alternative Substitute - Higher Current Rating)

The DR74-331-R manufactured by Eaton Electronics Division provides a substitute option with enhanced current handling capability. This part maintains the 330 µH inductance and ±20% tolerance while offering 450 mA current rating (versus 320 mA), providing 40.6% additional current margin. DC resistance is reduced to 1.41 Ohm, resulting in lower power dissipation compared to the original 1.86 Ohm specification.

Package dimensions are slightly larger (7.60 × 7.60 × 4.35 mm) compared to the original (7.30 × 7.30 × 4.50 mm). This part is ROHS3 compliant and rated for extended operating temperature range (-40°C to 125°C). The DR74-331-R is suitable for applications where increased current capacity and reduced thermal dissipation are beneficial, provided PCB footprint accommodates the 7.60mm length and width.

P1167.334NLT (Alternative Substitute - Extended Temperature Range)

The P1167.334NLT manufactured by Pulse Electronics offers a substitute with extended thermal operating range (-40°C to 130°C) and improved high-frequency performance (self-resonant frequency 3 MHz). Inductance remains 330 µH with ±20% tolerance. Current rating is 350 mA (9.4% above the original 320 mA specification), and DC resistance is 1.47 Ohm maximum (lower than the original 1.86 Ohm).

Package dimensions are 7.54 × 7.54 × 4.50 mm, representing a minor increase in length and width from the original 7.30 × 7.30 mm. This part is ROHS3 compliant and REACH unaffected. The P1167.334NLT is appropriate for applications requiring enhanced thermal stability or higher-frequency circuit operation.

Selection Basis:

All three substitute parts meet the mandatory electrical criteria: 330 µH inductance, shielded construction, surface mount configuration, and ±20% tolerance. Selection between CDRH74NP-331MC-B, DR74-331-R, and P1167.334NLT depends on specific application requirements regarding current margin, thermal dissipation, operating temperature envelope, and PCB layout constraints. All substitutes are ROHS3 compliant, addressing regulatory compliance gaps in the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the CDRH74NP-331MC-B be used as a direct replacement for the CDRH74-331MC without circuit modification?

A: Yes. The CDRH74NP-331MC-B is electrically and mechanically identical to the CDRH74-331MC. Both parts share the same inductance (330 µH), current rating (320 mA), DC resistance (1.86 Ohm maximum), package dimensions (7.30 × 7.30 × 4.50 mm), and operating temperature range (-40°C to 100°C). No circuit redesign is required. The primary difference is product status (active vs. obsolete) and regulatory compliance (ROHS3 vs. non-compliant).

Q: What is the significance of the lower DC resistance in the DR74-331-R (1.41 Ohm vs. 1.86 Ohm)?

A: Lower DC resistance reduces power dissipation in the inductor. Power loss is calculated as I²R; therefore, the DR74-331-R dissipates approximately 24% less power than the CDRH74-331MC at the same current level. This results in lower operating temperature and improved thermal performance. The trade-off is slightly larger package dimensions (7.60 × 7.60 mm vs. 7.30 × 7.30 mm).

Q: Is the P1167.334NLT suitable for high-frequency applications?

A: The P1167.334NLT specifies a self-resonant frequency of 3 MHz, indicating improved high-frequency performance compared to the original CDRH74-331MC (self-resonant frequency not specified). This part is suitable for circuits operating at frequencies approaching or within the megahertz range. The inductance test frequency for P1167.334NLT is 100 kHz, compared to 1 kHz for the original part, reflecting its high-frequency design optimization.

Q: Can the DR74-331-R be used in applications with tight PCB space constraints?

A: The DR74-331-R has slightly larger package dimensions (7.60 × 7.60 × 4.35 mm) compared to the original CDRH74-331MC (7.30 × 7.30 × 4.50 mm). The length and width increase by 0.30 mm in each direction. If the PCB layout has minimal clearance around the original component footprint, the DR74-331-R may not fit without redesign. The CDRH74NP-331MC-B maintains identical dimensions and is the preferred choice for space-constrained applications.

Q: What does ROHS3 compliance mean for these substitute parts?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers) in electrical and electronic equipment. The original CDRH74-331MC is RoHS non-compliant. All three substitute parts (CDRH74NP-331MC-B, DR74-331-R, and P1167.334NLT) are ROHS3 compliant, meeting current regulatory requirements for new product designs and procurement.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. The CDRH74NP-331MC-B, DR74-331-R, and P1167.334NLT are all supplied in Tape & Reel (TR) packaging format, suitable for automated pick-and-place assembly processes. The original CDRH74-331MC packaging format is not specified in the available data. TR packaging is standard for high-volume surface mount production.

Q: Which substitute part offers the best thermal performance?

A: The DR74-331-R provides the lowest DC resistance (1.41 Ohm), resulting in the lowest power dissipation and best thermal performance at rated current. Additionally, the DR74-331-R supports an extended operating temperature range (-40°C to 125°C) compared to the original (-40°C to 100°C). The P1167.334NLT offers the widest operating temperature range (-40°C to 130°C) and also features reduced DC resistance (1.47 Ohm). Selection depends on whether thermal dissipation reduction or extended temperature range is the primary design requirement.

Q: Can the current rating difference (320 mA vs. 450 mA for DR74-331-R) affect circuit behavior?

A: Current rating indicates the maximum continuous current the inductor can safely carry without exceeding saturation or thermal limits. A higher current rating (450 mA vs. 320 mA) does not change circuit behavior if the actual operating current remains at or below 320 mA. The higher rating provides design margin and improved reliability. However, if the circuit requires operation near the 320 mA limit, the DR74-331-R's higher saturation current (540 mA) provides additional safety margin before inductor saturation occurs.