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Z0805C252DSMST Ferrite Bead 2.5 kOhm 0805 Equivalent & Substitute Parts
Part Overview
The Z0805C252DSMST is a signal line ferrite bead manufactured by KEMET, designed for electromagnetic interference (EMI) suppression in 0805 (2012 Metric) surface mount applications. This component operates at 2.5 kOhms impedance at 100 MHz with a maximum current rating of 200mA and 750mOhm DC resistance. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Impedance @ 100 MHz | 2.5 kOhms |
| Current Rating (Max) | 200mA |
| DC Resistance (DCR) (Max) | 750mOhm |
| Package / Case | 0805 (2012 Metric) |
| Mounting Type | Surface Mount |
| Filter Type | Signal Line |
| Number of Lines | 1 |
| Operating Temperature Range | -55°C ~ 125°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the Z0805C252DSMST is determined by the following critical parameters:
Mechanical Compatibility: All substitute parts must use the 0805 (2012 Metric) package with surface mount configuration to ensure PCB layout and assembly compatibility.
Electrical Compatibility: Substitute parts must operate within the same impedance range at 100 MHz. The Z0805C252DSMST operates at 2.5 kOhms; acceptable substitutes include parts rated at 2.0 kOhms, 2.2 kOhms, and 2.7 kOhms, as these values fall within the standard ferrite bead impedance series and maintain functional EMI suppression characteristics.
Current Rating: All substitutes must support the 200mA maximum current rating or higher to ensure thermal stability and component longevity under specified operating conditions.
Environmental Compliance: All substitute parts must maintain ROHS3 compliance and MSL 1 rating to ensure regulatory conformance and moisture handling compatibility.
Product Status: Active status substitutes are preferred over obsolete components to ensure long-term supply chain availability.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz | Current Rating (Max) | DCR (Max) | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|
| Z0805C252DSMST | KEMET | 2.5 kOhms | 200mA | 750mOhm | 0805 (2012 Metric) | Obsolete | ROHS3 Compliant |
| 2508052027Z0 | Fair-Rite Products Corp. | 2 kOhms | 200mA | 400mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| 742792092 | Würth Elektronik | 2 kOhms | 200mA | 600mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| 742792093 | Würth Elektronik | 2.2 kOhms | 200mA | 600mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| 742792094 | Würth Elektronik | 2.2 kOhms | 200mA | 500mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| 742792095 | Würth Elektronik | 2.7 kOhms | 200mA | 600mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| BBBK00201209202Y00 | Pulse Electronics | 2 kOhms | 200mA | 700mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| BBBK00201209222Y00 | Pulse Electronics | 2.2 kOhms | 200mA | 700mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| BBBK00201209252Y00 | Pulse Electronics | 2.5 kOhms | 200mA | 700mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| BBGK00201209202Y00 | Pulse Electronics | 2 kOhms | 400mA | 550mOhm | 0805 (2012 Metric) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Impedance Match: BBBK00201209252Y00 (Pulse Electronics) provides an exact impedance match at 2.5 kOhms @ 100 MHz with active product status. This component is the primary substitute for direct replacement applications. The higher DCR of 700mOhm compared to the original 750mOhm remains within acceptable tolerance for signal line ferrite bead applications.
Near-Impedance Alternatives: Components rated at 2.2 kOhms (742792093, 742792094, BBBK00201209222Y00) and 2.7 kOhms (742792095) operate within the standard ferrite bead impedance series and provide functional EMI suppression. These are suitable for applications where impedance tolerance permits deviation from the original 2.5 kOhm specification.
Lower-Impedance Options: Components rated at 2.0 kOhms (2508052027Z0, 742792092, BBBK00201209202Y00) provide reduced impedance and are applicable in circuits where lower impedance values are acceptable or beneficial for EMI suppression characteristics.
Enhanced Current Rating: BBGK00201209202Y00 (Pulse Electronics) supports 400mA maximum current, double the original specification. This component is suitable for applications requiring higher current capacity while maintaining 2.0 kOhm impedance at 100 MHz.
All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and -55°C to 125°C operating temperature range, ensuring regulatory and environmental compatibility with the original component.
Frequently Asked Questions (FAQ)
Q: Can BBBK00201209252Y00 be used as a direct replacement for Z0805C252DSMST?
A: Yes. BBBK00201209252Y00 matches the impedance specification at 2.5 kOhms @ 100 MHz, current rating of 200mA, and 0805 package configuration. The DCR difference of 50mOhm (700mOhm vs. 750mOhm) is within acceptable tolerance for signal line ferrite bead applications. The component is active status, ensuring supply availability.
Q: What is the difference between 2.0 kOhm, 2.2 kOhm, and 2.5 kOhm ferrite beads?
A: These values represent the impedance measured at 100 MHz. Lower impedance values (2.0 kOhm) provide less attenuation but lower insertion loss. Higher impedance values (2.5 kOhm) provide greater EMI suppression. Selection depends on circuit requirements for EMI filtering versus signal integrity.
Q: Are all substitute parts compatible with the same PCB footprint?
A: Yes. All listed substitutes use the 0805 (2012 Metric) package with identical mechanical dimensions (0.079" L x 0.049" W or 2.00mm x 1.25mm), ensuring PCB footprint compatibility. Height variations (1.05mm to 1.10mm maximum) are within standard assembly tolerances.
Q: Why is BBGK00201209202Y00 rated for 400mA instead of 200mA?
A: BBGK00201209202Y00 belongs to the BBGK series, which is designed for higher current applications. The 400mA rating reflects the component's thermal design and material composition. This part is suitable for applications requiring higher current capacity while maintaining 2.0 kOhm impedance.
Q: Do all substitutes meet the same compliance requirements?
A: Yes. All listed substitute parts are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited moisture sensitivity level). All components operate within the -55°C to 125°C temperature range, matching the original specification.
Q: What is the significance of DCR (DC Resistance) variation among substitutes?
A: DCR affects power dissipation and insertion loss at DC and low frequencies. The original Z0805C252DSMST specifies 750mOhm maximum DCR. Substitutes with lower DCR (400mOhm to 600mOhm) generate less heat and provide lower insertion loss. Substitutes with higher DCR (700mOhm) remain within acceptable range for most signal line applications.
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