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Z0603C121CSMST Ferrite Bead 120 OHM 0603 Equivalent & Substitute Parts
Part Overview
The Z0603C121CSMST is a single-line ferrite bead manufactured by KEMET in the Z-SMS series, designed for signal line filtering applications. This component provides 120 Ohms of impedance at 100 MHz in a compact 0603 (1608 Metric) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Impedance @ 100 MHz | 120 Ohms |
| Current Rating (Maximum) | 300 mA |
| DC Resistance (Maximum) | 500 mOhm |
| Package / Case | 0603 (1608 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C to 125°C |
| Filter Type | Signal Line |
| Number of Lines | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the Z0603C121CSMST is determined by the following critical parameters:
Primary Matching Criteria:
- Impedance at 100 MHz: 120 Ohms (exact match required for signal filtering performance)
- Package / Case: 0603 (1608 Metric) (physical and electrical compatibility)
- Mounting Type: Surface Mount (assembly process compatibility)
- Operating Temperature Range: -55°C to 125°C (environmental specification)
- Filter Type: Signal Line (functional application category)
- Number of Lines: 1 (circuit topology requirement)
Secondary Compatibility Parameters:
- Current Rating: Substitute parts with equal or higher current capacity maintain functional compatibility
- DC Resistance: Lower DC resistance values provide improved performance characteristics
- RoHS Status: ROHS3 Compliant (regulatory requirement)
- Moisture Sensitivity Level: 1 (Unlimited) (handling and storage compatibility)
Substitute parts are grouped into two categories: Parametric Equivalents (matching all primary criteria with potential improvements in secondary parameters) and Near-Equivalents (matching primary criteria with variations in impedance value).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz | Current Rating (Max) | DC Resistance (Max) | Package / Case | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|
| Z0603C121CSMST | KEMET | 120 Ohms | 300 mA | 500 mOhm | 0603 (1608 Metric) | Obsolete | ROHS3 Compliant |
| Z0603C121BSMST | KEMET | 120 Ohms | 350 mA | 200 mOhm | 0603 (1608 Metric) | Obsolete | ROHS3 Compliant |
| 2506031217Z0 | Fair-Rite Products Corp. | 120 Ohms | 450 mA | 300 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 74279262 | Würth Elektronik | 120 Ohms | 500 mA | 300 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 742792620 | Würth Elektronik | 100 Ohms | 500 mA | 150 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 742792621 | Würth Elektronik | 140 Ohms | 550 mA | 200 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| ACML-0603-121-T | Abracon LLC | 120 Ohms | 600 mA | 400 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| BBBK00160808101Y00 | Pulse Electronics | 100 Ohms | 400 mA | 200 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| BBBK00160808121Y00 | Pulse Electronics | 120 Ohms | 400 mA | 250 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| BBGK00160808101Y00 | Pulse Electronics | 100 Ohms | 600 mA | 150 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| BBGK00160808121Y00 | Pulse Electronics | 120 Ohms | 600 mA | 150 mOhm | 0603 (1608 Metric) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Parametric Equivalents (120 Ohms @ 100 MHz):
The following parts provide exact impedance matching and are recommended as primary substitutes:
-
BBBK00160808121Y00 (Pulse Electronics): Active product status with 120 Ohms impedance, 400 mA current rating, and 250 mOhm DC resistance. Extensive inventory availability (167,633 pcs) supports production continuity.
-
BBGK00160808121Y00 (Pulse Electronics): Active product status with 120 Ohms impedance, 600 mA current rating, and 150 mOhm DC resistance. Superior current handling and reduced DC resistance provide enhanced performance margin. High inventory availability (172,142 pcs).
-
74279262 (Würth Elektronik WE-CBF series): Active product status with 120 Ohms impedance, 500 mA current rating, and 300 mOhm DC resistance. Suitable for applications requiring higher current capacity.
-
2506031217Z0 (Fair-Rite Products Corp.): Active product status with 120 Ohms impedance, 450 mA current rating, and 300 mOhm DC resistance. Established alternative from established ferrite bead manufacturer.
-
ACML-0603-121-T (Abracon LLC): Active product status with 120 Ohms impedance and 600 mA current rating. Highest current capacity among 120 Ohm equivalents.
Near-Equivalent Alternatives (Impedance Variation):
The following parts maintain 0603 package compatibility and operating temperature range but with different impedance values:
-
742792621 (Würth Elektronik WE-CBF series): 140 Ohms @ 100 MHz with 550 mA current rating. Suitable for applications where slightly higher impedance is acceptable.
-
742792620 (Würth Elektronik WE-CBF series): 100 Ohms @ 100 MHz with 500 mA current rating. Suitable for applications where slightly lower impedance is acceptable.
-
BBBK00160808101Y00 and BBGK00160808101Y00 (Pulse Electronics): 100 Ohms @ 100 MHz alternatives with varying current ratings.
All recommended substitutes maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and -55°C to 125°C operating temperature range.
Frequently Asked Questions (FAQ)
Q: Can I use BBGK00160808121Y00 as a direct replacement for Z0603C121CSMST?
A: Yes. Both components provide 120 Ohms impedance at 100 MHz in 0603 (1608 Metric) surface mount packages. BBGK00160808121Y00 is an active product with superior specifications: 600 mA current rating (versus 300 mA) and 150 mOhm DC resistance (versus 500 mOhm). Electrical and mechanical compatibility is maintained.
Q: What is the difference between BBBK00160808121Y00 and BBGK00160808121Y00?
A: Both are Pulse Electronics ferrite beads with 120 Ohms impedance at 100 MHz in 0603 packages. BBBK00160808121Y00 provides 400 mA current rating with 250 mOhm DC resistance. BBGK00160808121Y00 provides 600 mA current rating with 150 mOhm DC resistance. Selection depends on circuit current requirements and acceptable DC resistance losses.
Q: Can I substitute a 100 Ohm ferrite bead for the 120 Ohm Z0603C121CSMST?
A: Substitution with 100 Ohm impedance represents a functional change. The 120 Ohm specification determines filtering performance at 100 MHz. Use 100 Ohm alternatives only if circuit design permits impedance variation or if application requirements are less stringent than the original specification.
Q: Can I substitute a 140 Ohm ferrite bead for the 120 Ohm Z0603C121CSMST?
A: Substitution with 140 Ohm impedance represents a functional change. The 120 Ohm specification determines filtering performance at 100 MHz. Use 140 Ohm alternatives only if circuit design permits impedance variation or if application requirements are less stringent than the original specification.
Q: Why is Z0603C121BSMST listed as obsolete if it is a KEMET equivalent?
A: Z0603C121BSMST is a parametric equivalent from KEMET's Z-SMS series with identical impedance (120 Ohms @ 100 MHz) but improved specifications (350 mA current rating, 200 mOhm DC resistance). Both Z0603C121CSMST and Z0603C121BSMST are classified as obsolete products. Active alternatives from other manufacturers are recommended for new designs.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the regulatory status of the original Z0603C121CSMST component.
Q: What is the significance of DC resistance (DCR) in ferrite bead selection?
A: DC resistance represents resistive losses in the ferrite bead at direct current. Lower DC resistance values reduce power dissipation and heat generation in the component. Substitute parts with lower DC resistance (such as BBGK00160808121Y00 at 150 mOhm) provide improved efficiency compared to the original part (500 mOhm).
Q: Can I use ACML-0603-121-T in high-current applications?
A: ACML-0603-121-T provides 600 mA current rating, the highest among 120 Ohm equivalents. This component is suitable for applications requiring maximum current capacity within the 0603 package format.
Q: What packaging options are available for 120 Ohm 0603 ferrite beads?
A: Substitute parts are available in Cut Tape (CT), Tape & Reel (TR), and Digi-Reel® packaging formats. Selection depends on production volume and assembly process requirements. All packaging formats maintain identical electrical and mechanical specifications.
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