CDR156NP-331LC Equivalent & Substitute Parts

Part Overview

The CDR156NP-331LC is a 330 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc., rated for 900 mA continuous current with a maximum DC resistance of 646 mOhm. This surface mount component operates across the temperature range of -40°C to 100°C and is RoHS3 compliant with MSL 1 rating.

The CDR156NP-331LC is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 330 µH inductance in surface mount configurations.

Substiute Parts

CDR156NP-331LC

Sumida America Components Inc.In Stock: 967CDR156NP-331LC Datasheet

Current PartRFQ

P0250.334NLT

Pulse ElectronicsIn Stock: 4564P0250.334NLT Datasheet

DirectRFQ

SDR1806-331KL

Bourns Inc.In Stock: 1532SDR1806-331KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDR156NP-331LC are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 330 µH (exact match required)
• Inductance tolerance: ±15% or tighter
• Current rating: minimum 900 mA continuous
• Saturation current (Isat): minimum 1.6 A
• DC resistance: 646 mOhm or lower
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Operating temperature range: minimum -40°C to 100°C coverage
• RoHS3 compliance required
• MSL rating: 1 (Unlimited)

Identified Substitute Parts:

1. P0250.334NLT (Pulse Electronics) - Direct manufacturer equivalent meeting all primary criteria with enhanced current rating and lower DCR
2. SDR1806-331KL (Bourns Inc.) - Similar configuration with ferrite drum core, tighter tolerance, and active product status

Both substitute parts maintain the 330 µH inductance specification, unshielded configuration, surface mount packaging, and RoHS3 compliance required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

P0250.334NLT (Pulse Electronics) qualifies as a direct manufacturer equivalent. This part is currently in active production status with 4543 units in stock. It meets all electrical specifications with improved performance characteristics: 1 A current rating (versus 900 mA), 560 mOhm maximum DCR (versus 646 mOhm), and 1.9 A saturation current (versus 1.6 A). The extended operating temperature range to 130°C provides additional thermal margin. Physical dimensions are within 0.005" variance on length and width, with height increase of 0.014" maximum. RoHS3 compliance and MSL 1 rating are maintained.

SDR1806-331KL (Bourns Inc.) qualifies as a similar substitute with active product status and 1510 units in stock. This part features tighter inductance tolerance (±10% versus ±15%), ferrite drum core construction matching the original design, and lower DCR at 580 mOhm maximum. Saturation current is 1.8 A. Physical dimensions are slightly smaller, with height reduction of 0.004" and width reduction of 0.040". Operating temperature range extends to 125°C. RoHS3 compliance and MSL 1 rating are maintained. Additional performance data includes Q factor of 18 at 796 kHz and self-resonant frequency of 3.5 MHz.

Both substitute parts are suitable for direct replacement in applications requiring 330 µH inductance at 900 mA continuous current. Selection between P0250.334NLT and SDR1806-331KL depends on specific application requirements regarding DCR, saturation current margin, and physical space constraints.

Frequently Asked Questions (FAQ)

Q: Can P0250.334NLT be used as a direct replacement for CDR156NP-331LC?

A: Yes. P0250.334NLT meets all primary electrical specifications: 330 µH inductance, ±15% tolerance, 1 A current rating (exceeds 900 mA requirement), 1.9 A saturation current, 560 mOhm maximum DCR, unshielded configuration, surface mount packaging, -40°C to 130°C operating range, RoHS3 compliance, and MSL 1 rating. Physical dimensions are within acceptable variance for standard PCB layouts.

Q: What are the key differences between SDR1806-331KL and the original CDR156NP-331LC?

A: SDR1806-331KL provides tighter inductance tolerance (±10% versus ±15%), lower DC resistance (580 mOhm versus 646 mOhm), higher saturation current (1.8 A versus 1.6 A), and extended operating temperature to 125°C. Physical dimensions are slightly smaller. Both use ferrite drum core construction and maintain unshielded, surface mount configuration with RoHS3 compliance.

Q: Are there packaging differences between these substitute parts?

A: The original CDR156NP-331LC packaging is listed as nonstandard. P0250.334NLT is supplied in Tape & Reel (TR) format. SDR1806-331KL is supplied in Cut Tape (CT) and Digi-Reel® format. Both substitute parts are surface mount compatible with standard pick-and-place equipment.

Q: Do the substitute parts have the same moisture sensitivity level?

A: Yes. Both P0250.334NLT and SDR1806-331KL maintain MSL 1 (Unlimited) rating, identical to the original CDR156NP-331LC. No additional moisture control measures are required during storage or handling.

Q: What is the impact of lower DC resistance in substitute parts?

A: Lower DC resistance (560 mOhm for P0250.334NLT and 580 mOhm for SDR1806-331KL versus 646 mOhm for CDR156NP-331LC) reduces resistive losses and heat generation during operation. This provides improved efficiency and thermal performance, particularly beneficial in applications with sustained current draw near the 900 mA rating.

Q: Are both substitute parts RoHS3 compliant?

A: Yes. Both P0250.334NLT and SDR1806-331KL are RoHS3 compliant with EAR99 ECCN classification, matching the original CDR156NP-331LC compliance status.

Q: Can I use either substitute part interchangeably?

A: Both parts meet the core electrical requirements for 330 µH inductance at 900 mA. Selection depends on application-specific priorities: P0250.334NLT offers lower DCR and higher saturation current; SDR1806-331KL offers tighter tolerance and ferrite core construction matching the original design. Physical dimensions differ slightly, requiring PCB layout verification for space-constrained applications.