CDR95NP-3R3MC Equivalent & Substitute Parts

Part Overview

The CDR95NP-3R3MC is a 3.3 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc., rated for 6.2 A continuous current with a maximum DC resistance of 12.5 mOhm. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement.

The CDR95 series inductor is designed for surface mount applications in power conversion, filtering, and energy storage circuits. Due to its obsolete status, direct replacements from active product lines are required to maintain supply chain continuity and ensure long-term component availability.

Key Parameters

Parameter	CDR95NP-3R3MC Value	Substitution Relevance
Inductance	3.3 µH	Critical - must match exactly
Current Rating (Amps)	6.2 A	Critical - minimum acceptable rating
DC Resistance (DCR)	12.5 mOhm Max	Critical - affects efficiency and thermal performance
Current - Saturation (Isat)	7.8 A	Important - defines linear operating range
Shielding	Unshielded	Important - affects EMI characteristics
Type	Drum Core, Wirewound	Important - construction method
Material - Core	Ferrite	Important - core composition
Tolerance	±20%	Important - inductance accuracy
Operating Temperature	-40°C ~ 100°C	Important - thermal operating range
Mounting Type	Surface Mount	Critical - PCB assembly compatibility
RoHS Status	ROHS3 Compliant	Important - regulatory compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Important - storage and handling requirements

Substitute Part Grouping Explanation

Substitution of the CDR95NP-3R3MC is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 3.3 µH (exact match required)
Current rating: minimum 6.2 A continuous
DC resistance: maximum 12.5 mOhm preferred; up to 15 mOhm acceptable with thermal analysis
Core type: Ferrite drum core or equivalent wirewound construction
Shielding: Unshielded configuration
Mounting: Surface mount, nonstandard package
Tolerance: ±20%

Secondary Compatibility Factors:

Operating temperature range: minimum -40°C to +100°C
RoHS3 compliance required
MSL rating of 1 (unlimited moisture sensitivity)
Saturation current: minimum 6.4 A

Parts are grouped as direct equivalents when all primary criteria are met. Parts with current ratings below 6.2 A or DC resistance exceeding 15 mOhm are classified as similar alternatives requiring application-specific evaluation.

Parameter Comparison

Parameter	CDR95NP-3R3MC	SDR1005-3R3ML	74458003	B82464P4332M000	B82476A1332M000	B82476B1332M100	P0751.332NLT	UP2UC-3R3-R
Manufacturer	Sumida	Bourns	Würth Elektronik	EPCOS - TDK	EPCOS - TDK	EPCOS - TDK	Pulse Electronics	Eaton
Inductance (µH)	3.3	3.3	3.3	3.3	3.3	3.3	3.3	3.3
Current Rating (A)	6.2	5.0	6.2	5.5	5.4	5.9	5.4	5.4
Isat (A)	7.8	6.4	15.8	5.9	6.4	6.4	6.4	6.4
DCR Max (mOhm)	12.5	15	18	12	13.5	13.5	18	15
Shielding	Unshielded	Unshielded	Unshielded	Shielded	Unshielded	Unshielded	Unshielded	Unshielded
Type	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Wirewound	Wirewound
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite	Not specified	Not specified
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%	±20%	±20%
Operating Temp (°C)	-40 to 100	-40 to 125	-40 to 125	-55 to 150	-55 to 150	-55 to 150	-40 to 130	-25 to 85
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
AEC-Q200	Not listed	Not listed	Not listed	Yes	Not listed	Yes	Not listed	Not listed

Engineering Selection Recommendations

Direct Equivalents (Preferred Substitutes):

74458003 (Würth Elektronik WE-PD4 Series) is the primary direct equivalent. This part maintains the 6.2 A current rating matching the original CDR95NP-3R3MC specification. Although DC resistance is 18 mOhm (higher than the original 12.5 mOhm), the saturation current of 15.8 A provides superior headroom. The part is active, ROHS3 compliant, and operates across -40°C to 125°C. Thermal analysis is required to confirm acceptable power dissipation in the target application.

B82476B1332M100 (EPCOS - TDK Electronics B82476B1 Series) provides a near-equivalent alternative with 5.9 A current rating and 13.5 mOhm DCR. This part carries AEC-Q200 automotive qualification and operates across -55°C to 150°C, offering extended temperature range. The current rating is 95% of the original specification, suitable for applications with moderate current margin.

Secondary Alternatives (Acceptable with Application Review):

SDR1005-3R3ML (Bourns SDR1005 Series) offers 5.0 A current rating with 15 mOhm DCR. This part is active and widely available (2400 pcs in stock). The reduced current rating (81% of original) requires verification that application peak currents do not exceed 5.0 A continuous or 6.4 A saturation limits.

B82476A1332M000 (EPCOS - TDK Electronics B82476A1 Series) provides 5.4 A rating with 13.5 mOhm DCR and extended temperature range (-55°C to 150°C). Suitable for applications where the 5.4 A rating is adequate.

P0751.332NLT (Pulse Electronics P0751NL Series) and UP2UC-3R3-R (Eaton UNI-PAC™ 2UC Series) both offer 5.4 A ratings with 18 mOhm and 15 mOhm DCR respectively. These parts are active and available but require thermal verification due to higher DCR values.

Regulatory and Compliance Status:

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original part's environmental specifications. Parts B82476B1332M100 and B82464P4332M000 carry AEC-Q200 certification, suitable for automotive applications requiring enhanced reliability qualification.

Frequently Asked Questions (FAQ)

Q: Can SDR1005-3R3ML replace CDR95NP-3R3MC directly?

A: SDR1005-3R3ML is functionally compatible for inductance and core type but has a 5.0 A current rating versus the original 6.2 A. This part is acceptable only if application peak currents remain below 5.0 A continuous operation. Verify saturation margin (6.4 A Isat) against maximum transient current conditions.

Q: What is the significance of the 18 mOhm DCR in 74458003 compared to the original 12.5 mOhm?

A: The 5.5 mOhm increase in DC resistance results in proportionally higher I²R losses. For a 6.2 A load, this represents approximately 44% additional power dissipation (0.476 W vs 0.325 W). Thermal analysis of the PCB layout and ambient conditions is required to confirm acceptable junction temperature.

Q: Why does B82464P4332M000 have shielding while the original is unshielded?

A: B82464P4332M000 is classified as shielded, which alters its EMI emission profile. In applications sensitive to magnetic field coupling or where unshielded operation is specifically required for circuit function, this part is not suitable. Use unshielded alternatives: B82476B1332M100, B82476A1332M000, or SDR1005-3R3ML.

Q: What is the difference between Drum Core and generic Wirewound construction?

A: Drum core inductors (CDR95NP-3R3MC, SDR1005-3R3ML, 74458003, B82476 series) feature a cylindrical ferrite core with wire wound around it, providing defined inductance and saturation characteristics. Generic wirewound parts (P0751.332NLT, UP2UC-3R3-R) do not specify core material, potentially indicating air-core or alternative construction. Drum core parts are preferred for this application due to specified ferrite core material.

Q: Are there package dimension differences between substitutes?

A: Yes. The original CDR95NP-3R3MC measures 12.90mm L × 9.40mm W × 5.20mm H. Substitute dimensions vary: SDR1005-3R3ML is 12.70mm × 10.00mm × 5.00mm; 74458003 is 18.54mm × 15.24mm × 7.11mm (significantly larger). Verify PCB layout clearance before selecting 74458003. Smaller alternatives (B82476 series, P0751.332NLT, UP2UC-3R3-R) maintain similar footprints to the original.

Q: Which substitute offers the best thermal performance?

A: B82464P4332M000 has the lowest DCR at 12 mOhm, matching the original specification closely. However, its 5.5 A rating is lower than required. B82476B1332M100 offers 13.5 mOhm DCR with 5.9 A rating and AEC-Q200 qualification, providing a balanced thermal and electrical profile for most applications.

Q: Can I use a substitute with a higher current rating than 6.2 A?

A: Yes. Parts with current ratings exceeding 6.2 A (such as 74458003 at 6.2 A or higher saturation current) are acceptable and provide additional safety margin. However, verify that physical dimensions and DCR values are compatible with thermal and space constraints.

Q: What does AEC-Q200 certification mean for inductor selection?

A: AEC-Q200 is an automotive electronics qualification standard ensuring enhanced reliability through stress testing and quality controls. Parts B82476B1332M100 and B82464P4332M000 carry this certification, making them suitable for automotive and mission-critical applications requiring documented reliability qualification.

Q: Is the operating temperature range critical for substitution?

A: The original CDR95NP-3R3MC operates -40°C to 100°C. Most substitutes extend this range to 125°C or higher. If the application operates within -40°C to 100°C, all substitutes are acceptable. If operation exceeds 100°C, verify the substitute's upper temperature limit. UP2UC-3R3-R has a reduced upper limit of 85°C and is not suitable for high-temperature applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message