Bourns Inc. SDR1105-101KL: Premium Drum Core Wirewound Inductor for Demanding Applications

The SDR1105-101KL from Bourns Inc. represents the gold standard in surface mount drum core wirewound inductors, delivering exceptional performance in power conversion and filtering applications. This comprehensive guide explores every aspect of this critical component, helping engineers make informed design decisions.

In-Depth Product Analysis

Manufacturer Background

Bourns Inc., a global leader in electronic components since 1947, designed the SDR1105-101KL to meet the rigorous demands of modern electronics. As an Active product in their catalog, it benefits from continuous quality improvements and manufacturing support.

Technical Specifications Breakdown

Inductance Characteristics:
Nominal: 100 H 10%
Test Frequency: 1 kHz
Temperature Stability: Excellent across -40 C to +125 C range

Current Handling:
Rated Current: 1.5A
Saturation Current (Isat): 2.8A
Thermal Derating: Minimal up to 85 C

Efficiency Metrics:
DC Resistance: 320m max
Core Material: High-grade ferrite
Q Factor: Typically >30 at 1MHz

Mechanical Design Excellence

The SDR1105-101KL features a robust surface-mount package with:
Dimensions: 11.10mm 10.00mm 5.00mm
Termination: Sn/Pb or lead-free options
Weight: Approximately 1.8g
Mounting: Compatible with standard SMT processes

Advanced Applications

This inductor excels in:
1. Switch-Mode Power Supplies: Provides excellent noise suppression in buck/boost converters
2. Automotive Electronics: Meets vibration requirements for engine control units
3. RF Circuits: Low-loss characteristics benefit impedance matching networks
4. Industrial Controls: Reliable operation in harsh environments

Competitive Advantages

The SDR1105-101KL outperforms alternatives with:
20% better current handling than similar-sized inductors
Tight inductance tolerance ( 10%) for precision circuits
RoHS compliance for global market acceptance
100% automated optical inspection for quality assurance

Design Considerations

For optimal performance:
Maintain 0.5mm clearance from heat sources
Use thermal relief patterns in PCB layout
Consider parallel inductors for higher current needs
Avoid placement near strong magnetic fields

Reliability Data

Extensive testing confirms:
MTBF >1,000,000 hours at rated current
Withstands 1,000 thermal cycles (-40 C to +125 C)
Moisture Sensitivity Level (MSL): 1 (unlimited floor life)

Purchasing Information

Available through:
Authorized distributors (Digi-Key, Mouser, etc.)
Tape and reel packaging (standard 1,000 pieces/reel)
Sample quantities for prototyping
Custom reel quantities available

Conclusion

The Bourns SDR1105-101KL sets the benchmark for drum core wirewound inductors, combining precision engineering with rugged reliability. Its 100 H inductance, 1.5A current rating, and compact SMT package make it ideal for power electronics designers seeking uncompromising performance. For your next power supply, converter, or filtering application, trust the proven performance of Bourns' SDR1105 series.

For technical support or design assistance, contact Bourns' engineering team or visit their application notes library for implementation guidelines. Upgrade your designs today with this industry-leading inductor solution.