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Z0603C331CSMST Equivalent & Substitute Parts
Part Overview
The Z0603C331CSMST is a 330 Ohm ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This component functions as a single-line signal filter for electromagnetic interference suppression in electronic circuits. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Impedance @ Frequency | 330 Ohms @ 100 MHz |
| Current Rating (Max) | 200 mA |
| DC Resistance (DCR) (Max) | 850 mOhm |
| Package / Case | 0603 (1608 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 125°C |
| Filter Type | Signal Line |
| Number of Lines | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the Z0603C331CSMST is determined by the following critical parameters:
Impedance Matching: The primary electrical characteristic is impedance at 100 MHz. Substitutes must provide either 330 Ohms (direct impedance match) or 300 Ohms (parametric equivalent within ferrite bead tolerance bands).
Current Rating Compatibility: The original part supports 200 mA maximum current. Substitutes with equal or higher current ratings (200 mA, 300 mA, or 400 mA) are functionally compatible.
DC Resistance (DCR): Maximum DCR values range from 300 mOhm to 850 mOhm across available substitutes. Lower DCR values indicate improved performance characteristics.
Package and Mounting: All substitutes maintain the 0603 (1608 Metric) surface mount package, ensuring mechanical and footprint compatibility.
Environmental and Compliance Standards: All substitutes maintain -55°C to 125°C operating temperature range, ROHS3 compliance, MSL 1 rating, and REACH unaffected status.
Packaging Format: Substitutes are available in Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR) formats.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz | Current Rating (Max) | DCR (Max) | Package / Case | Packaging Format | Product Status |
|---|---|---|---|---|---|---|---|
| Z0603C331CSMST | KEMET | 330 Ohms | 200 mA | 850 mOhm | 0603 (1608 Metric) | Cut Tape (CT) & Digi-Reel® | Obsolete |
| BLM18BD331SN1D | Murata Electronics | 330 Ohms | 200 mA | 500 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| BLM18BB331SN1D | Murata Electronics | 330 Ohms | 400 mA | 580 mOhm | 0603 (1608 Metric) | Cut Tape (CT) & Digi-Reel® | Active |
| BLM18HK331SN1D | Murata Electronics | 330 Ohms | 200 mA | 500 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| BBGK00160808331Y00 | Pulse Electronics | 330 Ohms | 400 mA | 300 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| 74279264 | Würth Elektronik | 300 Ohms | 200 mA | 350 mOhm | 0603 (1608 Metric) | Cut Tape (CT) & Digi-Reel® | Active |
| 742792640 | Würth Elektronik | 300 Ohms | 300 mA | 350 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| ACML-0603-301-T | Abracon LLC | 300 Ohms | 200 mA | 350 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| BBBK00160808301Y00 | Pulse Electronics | 300 Ohms | 300 mA | 400 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| BBNQ00160808301Y00 | Pulse Electronics | 300 Ohms | 400 mA | 400 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
| EMI0603R-300 | API Delevan Inc. | 300 Ohms | 300 mA | 350 mOhm | 0603 (1608 Metric) | Tape & Reel (TR) | Active |
Engineering Selection Recommendations
Direct Impedance Match (330 Ohms @ 100 MHz)
The following active substitutes provide identical impedance to the Z0603C331CSMST:
-
BLM18BD331SN1D (Murata Electronics): Matches original specifications with 200 mA current rating and 500 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
BLM18BB331SN1D (Murata Electronics): Provides enhanced current rating of 400 mA with 580 mOhm DCR. Available in Cut Tape & Digi-Reel format, matching original packaging preference. ROHS3 compliant, MSL 1, REACH unaffected.
-
BLM18HK331SN1D (Murata Electronics): Matches original 200 mA current rating with 500 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
BBGK00160808331Y00 (Pulse Electronics): Provides superior DCR performance at 300 mOhm with enhanced 400 mA current rating. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
Parametric Equivalent (300 Ohms @ 100 MHz)
The following active substitutes provide 300 Ohm impedance, representing parametric equivalence within ferrite bead impedance tolerance specifications:
-
74279264 (Würth Elektronik): Matches 200 mA current rating with improved 350 mOhm DCR. Available in Cut Tape & Digi-Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
742792640 (Würth Elektronik): Provides enhanced 300 mA current rating with 350 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
ACML-0603-301-T (Abracon LLC): Matches 200 mA current rating with 350 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
BBBK00160808301Y00 (Pulse Electronics): Provides enhanced 300 mA current rating with 400 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
BBNQ00160808301Y00 (Pulse Electronics): Provides enhanced 400 mA current rating with 400 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
-
EMI0603R-300 (API Delevan Inc.): Provides enhanced 300 mA current rating with 350 mOhm DCR. Available in Tape & Reel format. ROHS3 compliant, MSL 1, REACH unaffected.
All substitutes maintain the 0603 (1608 Metric) surface mount package, -55°C to 125°C operating temperature range, ROHS3 compliance, MSL 1 rating, and REACH unaffected status.
Frequently Asked Questions (FAQ)
Q: Can I use a 300 Ohm ferrite bead as a substitute for the 330 Ohm Z0603C331CSMST?
A: Yes. The 300 Ohm impedance value at 100 MHz represents a parametric equivalent within standard ferrite bead impedance tolerance specifications. Both values function within the same application category for signal line filtering.
Q: What is the significance of DCR (DC Resistance) in ferrite bead selection?
A: DCR represents the resistive loss of the ferrite bead at DC and low frequencies. Lower DCR values indicate reduced signal attenuation and power dissipation. The Z0603C331CSMST specifies 850 mOhm maximum DCR. Substitutes with lower DCR values (300–580 mOhm) provide improved performance characteristics while maintaining functional compatibility.
Q: Does current rating affect substitution compatibility?
A: Current rating determines the maximum continuous current the ferrite bead can handle without exceeding thermal limits. The Z0603C331CSMST supports 200 mA. Substitutes with equal or higher current ratings (200 mA, 300 mA, or 400 mA) are compatible. Substitutes with lower current ratings are not suitable.
Q: Are Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging formats interchangeable?
A: Both formats contain identical components and are functionally equivalent. The difference is in delivery and handling format. Cut Tape & Digi-Reel® is suitable for manual assembly or small-volume applications. Tape & Reel is optimized for automated assembly processes. Selection depends on manufacturing process requirements, not electrical performance.
Q: What does MSL 1 (Unlimited) moisture sensitivity level mean?
A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitutes maintain this specification, ensuring consistent handling procedures.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitutes are ROHS3 compliant and REACH unaffected, matching the environmental and regulatory compliance status of the original Z0603C331CSMST.
Q: Which substitute provides the best overall performance improvement?
A: Selection depends on specific application requirements. BBGK00160808331Y00 (Pulse Electronics) provides the lowest DCR (300 mOhm) with matching 330 Ohm impedance and enhanced 400 mA current rating. For applications requiring parametric equivalence, EMI0603R-300 (API Delevan Inc.) and 742792640 (Würth Elektronik) offer 350 mOhm DCR with enhanced current ratings.
Q: Can I substitute the Z0603C331CSMST in existing designs without PCB modifications?
A: Yes. All listed substitutes maintain the 0603 (1608 Metric) surface mount package with identical footprint dimensions (0.063" L x 0.031"–0.032" W) and maximum height (0.037"–0.039"). No PCB layout changes are required.
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