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Z0603C431CSMST Ferrite Bead 430 Ohm 0603 Equivalent & Substitute Parts
Part Overview
The Z0603C431CSMST is a 430 Ohm ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This single-line signal filtering component operates at 100 MHz impedance with a maximum current rating of 200mA and 850mOhm DC resistance. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity.
Ferrite beads in this category function as electromagnetic interference (EMI) suppressors for signal line applications. The Z0603C431CSMST belongs to KEMET's Z-SMS series and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Impedance @ 100 MHz | 430 Ohms |
| Current Rating (Maximum) | 200mA |
| DC Resistance (Maximum) | 850mOhm |
| Package / Case | 0603 (1608 Metric) |
| Number of Lines | 1 |
| Operating Temperature Range | -55°C to 125°C |
| Mounting Type | Surface Mount |
| Height (Maximum) | 0.037" (0.95mm) |
| RoHS Status | RoHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the Z0603C431CSMST is determined by the following critical parameters:
Primary Substitution Criteria:
- Package / Case: 0603 (1608 Metric) surface mount form factor
- Number of Lines: Single signal line configuration
- Operating Temperature Range: -55°C to 125°C minimum
- Mounting Type: Surface mount compatibility
- RoHS3 Compliance and MSL 1 rating
Secondary Compatibility Parameters:
- Impedance @ 100 MHz: 430 Ohms nominal (tolerance range 400–500 Ohms acceptable for signal line filtering)
- Current Rating: Minimum 200mA (higher ratings provide design margin)
- DC Resistance: Maximum 850mOhm (lower values reduce insertion loss)
Substitute parts are grouped into two categories:
Category A – Direct Impedance Match (420–430 Ohms): Parts with impedance within ±10 Ohms of the original specification, providing closest functional equivalence.
Category B – Near-Impedance Match (470–500 Ohms): Parts with impedance 40–70 Ohms above the original specification, suitable for applications where slightly higher attenuation is acceptable and current or DCR performance is improved.
All listed substitutes maintain the 0603 package, single-line configuration, and full temperature range operation. All are RoHS3 compliant with MSL 1 rating.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz | Current Rating (Max) | DC Resistance (Max) | Package | Height (Max) | Product Status |
|---|---|---|---|---|---|---|---|
| Z0603C431CSMST | KEMET | 430 Ohms | 200mA | 850mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Obsolete |
| BLM18BD421SN1D | Murata Electronics | 420 Ohms | 200mA | 550mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| BLM18BD471SN1D | Murata Electronics | 470 Ohms | 200mA | 550mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| BLM18BB471SN1D | Murata Electronics | 470 Ohms | 300mA | 850mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| BLM18HG471SN1D | Murata Electronics | 470 Ohms | 200mA | 850mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| BLM18HK471SN1D | Murata Electronics | 470 Ohms | 200mA | 700mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| BLM18RK471SN1D | Murata Electronics | 470 Ohms | 200mA | 500mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| 742792642 | Würth Elektronik | 470 Ohms | 200mA | 450mOhm | 0603 (1608 Metric) | 0.039" (1.00mm) | Active |
| 742792643 | Würth Elektronik | 470 Ohms | 400mA | 350mOhm | 0603 (1608 Metric) | 0.039" (1.00mm) | Active |
| ACML-0603-501-T | Abracon LLC | 500 Ohms | 200mA | 450mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
| BMC1JY0400AN | TE Connectivity Passive Product | 400 Ohms | 400mA | 300mOhm | 0603 (1608 Metric) | 0.037" (0.95mm) | Active |
Engineering Selection Recommendations
Primary Recommendation – Direct Impedance Equivalent:
BLM18BD421SN1D (Murata Electronics) provides the closest impedance match at 420 Ohms, within 10 Ohms of the original Z0603C431CSMST specification. This part is active, RoHS3 compliant, and maintains the identical 0603 package and 200mA current rating. The DC resistance of 550mOhm is lower than the original 850mOhm, reducing insertion loss. This part is suitable for direct substitution in signal line filtering applications.
Secondary Recommendation – Improved Performance Profile:
BLM18RK471SN1D (Murata Electronics) operates at 470 Ohms impedance with 500mOhm DC resistance, offering improved current handling characteristics and reduced insertion loss compared to the original part. The 470 Ohm impedance provides slightly higher attenuation, acceptable for most signal line EMI suppression applications. This part is active and RoHS3 compliant.
Alternative for Higher Current Applications:
BLM18BB471SN1D (Murata Electronics) provides 470 Ohm impedance with 300mA current rating, suitable for applications requiring higher current capacity than the original 200mA specification. DC resistance matches the original at 850mOhm.
High-Volume Availability Option:
BLM18BD471SN1D (Murata Electronics) is available in high inventory (60,200 pieces) with 470 Ohm impedance, 200mA current rating, and 550mOhm DC resistance. This part supports procurement continuity for high-volume production requirements.
Würth Elektronik Alternative:
742792642 (Würth Elektronik) provides 470 Ohm impedance with superior DC resistance of 450mOhm and high inventory availability (27,542 pieces). Height specification is 0.039" (1.00mm), marginally higher than the original 0.037" (0.95mm), requiring verification of PCB clearance in space-constrained applications.
All recommended substitutes are RoHS3 compliant, MSL 1 rated, and operate across the -55°C to 125°C temperature range.
Frequently Asked Questions (FAQ)
Q: Can BLM18BD421SN1D be used as a direct replacement for Z0603C431CSMST?
A: Yes. BLM18BD421SN1D matches the original part in package (0603), current rating (200mA), operating temperature range (-55°C to 125°C), and RoHS3 compliance. The impedance difference of 10 Ohms (420 Ohms vs. 430 Ohms) is within acceptable tolerance for signal line ferrite bead applications. The lower DC resistance (550mOhm vs. 850mOhm) provides improved performance.
Q: What is the impedance tolerance range for acceptable substitution?
A: Substitutes with impedance between 400 Ohms and 500 Ohms at 100 MHz are functionally compatible with the Z0603C431CSMST for signal line filtering. The original 430 Ohm specification allows ±70 Ohms variation while maintaining EMI suppression effectiveness. Parts outside this range require application-specific verification.
Q: Does the height difference between 0.037" and 0.039" affect PCB assembly?
A: The 0.002" (0.05mm) height difference is negligible for standard PCB assembly processes. However, applications with height-constrained designs or specific solder reflow profiles should verify clearance. Würth Elektronik parts (742792642, 742792643) specify 0.039" maximum height compared to 0.037" for KEMET and most Murata parts.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity) rating, matching the original Z0603C431CSMST environmental and regulatory specifications.
Q: Which substitute offers the lowest DC resistance?
A: BMC1JY0400AN (TE Connectivity) provides the lowest DC resistance at 300mOhm, with 400 Ohm impedance and 400mA current rating. This part is suitable for applications prioritizing minimal insertion loss and higher current capacity.
Q: Can I use a 470 Ohm ferrite bead instead of 430 Ohm?
A: Yes. The 470 Ohm impedance provides approximately 9% higher attenuation than the original 430 Ohm specification. For signal line EMI suppression, this increased attenuation is generally beneficial and does not degrade circuit performance. Multiple active 470 Ohm options are available from Murata, Würth Elektronik, and Abracon.
Q: What is the difference between BLM18BD471SN1D and BLM18HK471SN1D?
A: Both parts operate at 470 Ohms impedance with 200mA current rating in 0603 package. The primary difference is DC resistance: BLM18BD471SN1D specifies 550mOhm maximum, while BLM18HK471SN1D specifies 700mOhm maximum. BLM18BD471SN1D provides lower insertion loss and is preferred for applications sensitive to signal attenuation.
Q: Is packaging format (Cut Tape vs. Tape & Reel) a substitution factor?
A: Packaging format does not affect electrical or mechanical compatibility. Cut Tape (CT) and Tape & Reel (TR) formats are logistics and procurement considerations. Both formats are suitable for the same application; selection depends on production volume and assembly line requirements.
Q: Which substitute has the highest current rating?
A: 742792643 (Würth Elektronik) and BMC1JY0400AN (TE Connectivity) both provide 400mA maximum current rating, double the original 200mA specification. These parts are suitable for applications requiring higher current capacity with maintained EMI suppression.
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