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Z0805C102ASMST Ferrite Bead 1K OHM 0805 Equivalent & Substitute Parts
Part Overview
The Z0805C102ASMST is a 1 kOhm ferrite bead manufactured by KEMET in the 0805 (2012 Metric) surface mount package. This single-line signal ferrite bead operates at 1 kOhms impedance at 100 MHz with a maximum current rating of 300mA and 400mOhm DC resistance. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement continuity. Ferrite beads in this specification are used for electromagnetic interference (EMI) suppression in signal line applications across a wide range of electronic circuits.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Impedance @ 100 MHz | 1 kOhms |
| Current Rating (Max) | 300mA |
| DC Resistance (Max) | 400mOhm |
| Package / Case | 0805 (2012 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 125°C |
| Number of Lines | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the Z0805C102ASMST is determined by the following critical parameters:
Mandatory Matching Parameters:
- Impedance @ 100 MHz: 1 kOhms
- Package / Case: 0805 (2012 Metric)
- Mounting Type: Surface Mount
- Number of Lines: 1
- Operating Temperature Range: -55°C ~ 125°C
Allowable Variation Parameters:
- Current Rating (Max): The original part specifies 300mA. Substitute parts with equal or higher current ratings (300mA, 400mA, 500mA, or 600mA) are functionally compatible.
- DC Resistance (Max): The original part specifies 400mOhm. Substitute parts with equal or lower DC resistance values (270mOhm through 400mOhm) are functionally compatible.
- Product Status: Active parts are preferred over obsolete or Last Time Buy status for long-term availability.
- Compliance: All substitute parts must maintain ROHS3 compliance and MSL 1 rating.
Substitute parts that meet all mandatory matching parameters and fall within the allowable variation ranges are electrically and mechanically compatible with the Z0805C102ASMST.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz | Current Rating (Max) | DC Resistance (Max) | Package / Case | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| Z0805C102ASMST | KEMET | 1 kOhms | 300mA | 400mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Obsolete | ROHS3 Compliant |
| Z0805C102BSMST | KEMET | 1 kOhms | 400mA | 350mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Obsolete | ROHS3 Compliant |
| BBGK00201209102Y00 | Pulse Electronics | 1 kOhms | 400mA | 300mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | ROHS3 Compliant |
| BBNQ00201209102Y00 | Pulse Electronics | 1 kOhms | 400mA | 400mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | ROHS3 Compliant |
| BLM21AG102SN1D | Murata Electronics | 1 kOhms | 600mA | 280mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | ROHS3 Compliant |
| BLM21AG102SZ1D | Murata Electronics | 1 kOhms | 600mA | 270mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | ROHS3 Compliant |
| CZB2AGTTD102P | KOA Speer Electronics, Inc. | 1 kOhms | 300mA | 400mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | ROHS3 Compliant |
| EMI0805R-1000 | API Delevan Inc. | 1 kOhms | 300mA | 350mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | ROHS3 Compliant |
| FB201209T-102Y-S-1 | Cal-Chip Electronics, Inc. | 1 kOhms | 500mA | 350mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Active | RoHS Compliant |
| MMZ2012R102AT000 | TDK Corporation | 1 kOhms | 500mA | 300mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Last Time Buy | ROHS3 Compliant |
| MMZ2012S102AT000 | TDK Corporation | 1 kOhms | 500mA | 350mOhm | 0805 (2012 Metric) | -55°C ~ 125°C | Last Time Buy | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Active Product Status):
For new designs and long-term procurement, the following active parts are recommended as direct substitutes:
- BBGK00201209102Y00 (Pulse Electronics): Offers improved DC resistance (300mOhm) with higher current rating (400mA) and active product status. Highest inventory availability (40,882 pcs).
- BLM21AG102SN1D (Murata Electronics): Provides superior performance with 600mA current rating and 280mOhm DC resistance. Active status with extensive inventory (167,300 pcs).
- BLM21AG102SZ1D (Murata Electronics): Lowest DC resistance (270mOhm) with 600mA current rating. Active status with 8,047 pcs available.
- CZB2AGTTD102P (KOA Speer Electronics): Exact electrical match to original part (300mA, 400mOhm) with active product status.
- EMI0805R-1000 (API Delevan Inc.): Improved DC resistance (350mOhm) with active product status.
- FB201209T-102Y-S-1 (Cal-Chip Electronics): 500mA current rating with 350mOhm DC resistance and active status.
Secondary Substitutes (Last Time Buy / Obsolete Status):
- Z0805C102BSMST (KEMET): Variant within same series with improved specifications (400mA, 350mOhm). Obsolete status.
- MMZ2012R102AT000 (TDK Corporation): 500mA current rating with 300mOhm DC resistance. Last Time Buy status with large inventory (639,792 pcs).
- MMZ2012S102AT000 (TDK Corporation): 500mA current rating with 350mOhm DC resistance. Last Time Buy status with 85,300 pcs available.
Compliance Considerations:
All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements. The part FB201209T-102Y-S-1 carries RoHS Compliant status rather than ROHS3 Compliant; this remains acceptable for applications requiring RoHS compliance.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with higher current rating than the original Z0805C102ASMST?
A: Yes. The original part is rated for 300mA maximum current. Substitute parts with equal or higher current ratings (400mA, 500mA, or 600mA) are functionally compatible and will operate within specification in the same circuit application.
Q: What is the significance of DC Resistance (DCR) variation among substitute parts?
A: DC resistance affects power dissipation and insertion loss in the circuit. The original part specifies 400mOhm maximum. Substitute parts with lower DC resistance (270mOhm to 350mOhm) will generate less heat and provide improved performance. Parts with equal or higher DC resistance are also acceptable.
Q: Are all substitute parts available in the same 0805 package?
A: Yes. All listed substitute parts are specified for the 0805 (2012 Metric) surface mount package with identical footprint dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm). Height variations exist (1.05mm to 1.10mm maximum), but these are within standard PCB assembly tolerances.
Q: Why is product status important when selecting a substitute?
A: Active products have ongoing manufacturing and supply availability. Obsolete and Last Time Buy parts have limited or no future availability. For new designs, active status parts are preferred. For legacy system support, Last Time Buy parts may be acceptable if sufficient inventory is available.
Q: Is the Z0805C102BSMST a suitable substitute for the Z0805C102ASMST?
A: Yes. The Z0805C102BSMST is a variant within the same KEMET Z-SMS series with improved specifications (400mA current rating versus 300mA, and 350mOhm DC resistance versus 400mOhm). However, both parts are obsolete. Active alternatives are recommended for new procurement.
Q: Can I substitute the MMZ2012R102AT000 or MMZ2012S102AT000 despite their Last Time Buy status?
A: These TDK parts are functionally compatible substitutes with substantial inventory availability (639,792 and 85,300 pcs respectively). They are suitable for applications where current inventory can support the product lifecycle. For indefinite future supply, active status parts are preferable.
Q: What is the difference between ROHS3 Compliant and RoHS Compliant?
A: ROHS3 Compliant indicates compliance with the third iteration of the Restriction of Hazardous Substances directive. RoHS Compliant indicates general RoHS compliance. Both designations satisfy RoHS requirements; ROHS3 represents the current standard. The FB201209T-102Y-S-1 part carries RoHS Compliant status and remains acceptable for RoHS-regulated applications.
Q: Are there any height restrictions I should consider when selecting a substitute?
A: The original part specifies 0.041" (1.05mm) maximum height. Most substitutes range from 1.05mm to 1.10mm maximum height. These variations are negligible for standard PCB assembly and do not affect electrical performance or mechanical fit in typical applications.
Q: Which substitute offers the best overall performance improvement?
A: The BLM21AG102SN1D and BLM21AG102SZ1D (Murata Electronics) offer the highest current ratings (600mA) and lowest DC resistance values (280mOhm and 270mOhm respectively), representing the best performance envelope. Both parts are active with extensive inventory availability.
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