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Z0201C121BSMST Ferrite Bead 120 OHM 0201 Equivalent & Substitute Parts
Part Overview
The Z0201C121BSMST is a 120 Ohm ferrite bead manufactured by KEMET, designed for single-line signal filtering applications in 0201 (0603 Metric) surface mount packages. This component operates at 100 MHz impedance with a maximum current rating of 200mA and DC resistance of 500mOhm across an operating temperature range of -55°C to 125°C.
The Z0201C121BSMST is classified as obsolete. Equivalent and substitute ferrite beads are available from active manufacturers including Murata Electronics, TE Connectivity, Würth Elektronik, Pulse Electronics, TDK Corporation, and Cal-Chip Electronics. Selection of alternative components requires verification of electrical parameters, mechanical compatibility, and application-specific requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Impedance @ 100 MHz | 120 | Ohms |
| Current Rating (Maximum) | 200 | mA |
| DC Resistance (Maximum) | 500 | mOhm |
| Package / Case | 0201 (0603 Metric) | — |
| Size / Dimension | 0.024" L x 0.012" W (0.60mm x 0.30mm) | — |
| Height (Maximum) | 0.013" (0.33mm) | — |
| 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 (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Ferrite bead substitution is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:
Electrical Parameters:
- Impedance at 100 MHz (120 Ohms for direct equivalents)
- Current rating (minimum 200mA for Z0201C121BSMST applications)
- DC resistance (500mOhm nominal tolerance)
Mechanical Parameters:
- Package type (0201 / 0603 Metric)
- Physical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm)
- Height (0.013" / 0.33mm maximum)
- Mounting type (Surface Mount)
Environmental Parameters:
- Operating temperature range (-55°C to 125°C)
- RoHS3 compliance
- Moisture sensitivity level (MSL 1)
Substitute parts are grouped into two categories:
Category 1: Parametric Equivalents (120 Ohms @ 100 MHz) Parts with identical impedance at 100 MHz, matching current ratings, and equivalent DC resistance. These parts are direct functional replacements.
Category 2: Similar Impedance Alternatives Parts with different impedance values (100 Ohms or 240 Ohms @ 100 MHz) that maintain identical mechanical and thermal specifications. These parts are suitable only when impedance variation is acceptable for the application.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz (Ohms) | Current Rating (mA) | DC Resistance (mOhm) | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|
| Z0201C121BSMST | KEMET | 120 | 200 | 500 | 0201 (0603 Metric) | Obsolete | Cut Tape (CT) & Digi-Reel® |
| BLM03AG121SN1D | Murata Electronics | 120 | 200 | 500 | 0201 (0603 Metric) | Active | Cut Tape (CT) & Digi-Reel® |
| BLM03BD121SN1D | Murata Electronics | 120 | 250 | 500 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
| BMC1HY0120AN | TE Connectivity Passive Product | 120 | 200 | 450 | 0201 (0603 Metric) | Active | Cut Tape (CT) |
| BBSJ00060303121Y00 | Pulse Electronics | 120 | 250 | 500 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
| BBSY00060303121Y00 | Pulse Electronics | 120 | 200 | 500 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
| 742692003 | Würth Elektronik | 120 | 200 | 450 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
| FB060303T-121Y-S | Cal-Chip Electronics, Inc. | 120 | 200 | 450 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
| BMC1HY0100AN | TE Connectivity Passive Product | 100 | 200 | 400 | 0201 (0603 Metric) | Active | Cut Tape (CT) |
| FB060303T-101Y-S | Cal-Chip Electronics, Inc. | 100 | 200 | 400 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
| MMZ0603S241CT000 | TDK Corporation | 240 | 200 | 570 | 0201 (0603 Metric) | Active | Tape & Reel (TR) |
Engineering Selection Recommendations
Direct Parametric Equivalents (120 Ohms @ 100 MHz, 200mA Rating)
The following parts provide direct electrical and mechanical equivalence to the Z0201C121BSMST:
-
BLM03AG121SN1D (Murata Electronics): Active product status. Identical impedance, current rating, and DC resistance. Available in Cut Tape & Digi-Reel® packaging matching the original part. ROHS3 compliant, MSL 1.
-
BMC1HY0120AN (TE Connectivity Passive Product): Active product status. Impedance and current rating match the original specification. DC resistance of 450mOhm is lower than the original 500mOhm specification. Available in Cut Tape packaging. ROHS3 compliant.
-
FB060303T-121Y-S (Cal-Chip Electronics, Inc.): Active product status. Impedance and current rating match the original specification. DC resistance of 450mOhm is lower than the original 500mOhm specification. Available in Tape & Reel packaging. RoHS compliant, MSL 1.
-
742692003 (Würth Elektronik): Active product status. Impedance and current rating match the original specification. DC resistance of 450mOhm is lower than the original 500mOhm specification. Available in Tape & Reel packaging. ROHS3 compliant, MSL 1.
Enhanced Current Rating Alternatives (120 Ohms @ 100 MHz, 250mA Rating)
The following parts provide identical impedance with increased current capacity:
-
BLM03BD121SN1D (Murata Electronics): Active product status. 120 Ohm impedance with 250mA current rating (exceeds original 200mA specification). DC resistance and package specifications match the original part. Available in Tape & Reel packaging. ROHS3 compliant, MSL 1.
-
BBSJ00060303121Y00 (Pulse Electronics): Active product status. 120 Ohm impedance with 250mA current rating (exceeds original 200mA specification). DC resistance and package specifications match the original part. Available in Tape & Reel packaging. ROHS3 compliant, MSL 1.
Alternative Impedance Options (Same Package and Thermal Specifications)
-
BBSY00060303121Y00 (Pulse Electronics): Active product status. 120 Ohm impedance with 200mA current rating and 500mOhm DC resistance. Identical to original electrical specifications. Available in Tape & Reel packaging. ROHS3 compliant, MSL 1.
-
BMC1HY0100AN (TE Connectivity Passive Product): Active product status. 100 Ohm impedance at 100 MHz. Suitable only when 100 Ohm impedance is acceptable for the application. DC resistance of 400mOhm is lower than the original specification. Available in Cut Tape packaging.
-
FB060303T-101Y-S (Cal-Chip Electronics, Inc.): Active product status. 100 Ohm impedance at 100 MHz. Suitable only when 100 Ohm impedance is acceptable for the application. DC resistance of 400mOhm is lower than the original specification. Available in Tape & Reel packaging.
-
MMZ0603S241CT000 (TDK Corporation): Active product status. 240 Ohm impedance at 100 MHz. Suitable only when 240 Ohm impedance is acceptable for the application. DC resistance of 570mOhm exceeds the original specification. Available in Tape & Reel packaging. ROHS3 compliant, MSL 1.
All recommended substitutes maintain the 0201 (0603 Metric) package form factor, surface mount mounting type, and -55°C to 125°C operating temperature range. All parts are RoHS3 compliant with MSL 1 moisture sensitivity rating.
Frequently Asked Questions (FAQ)
Q: Can BLM03AG121SN1D be used as a direct replacement for Z0201C121BSMST?
A: Yes. BLM03AG121SN1D provides identical electrical specifications (120 Ohms @ 100 MHz, 200mA, 500mOhm DC resistance) and mechanical compatibility (0201 package, 0.024" x 0.012" dimensions, 0.013" height). Both are available in Cut Tape & Digi-Reel® packaging. BLM03AG121SN1D is an active product from Murata Electronics.
Q: What is the difference between the 120 Ohm and 100 Ohm ferrite beads?
A: The primary difference is impedance at 100 MHz. The 120 Ohm parts (Z0201C121BSMST, BLM03AG121SN1D, BMC1HY0120AN, FB060303T-121Y-S, 742692003) provide higher impedance filtering. The 100 Ohm parts (BMC1HY0100AN, FB060303T-101Y-S) provide lower impedance filtering. Selection depends on the specific EMI filtering requirements of the application. These parts are not interchangeable without circuit analysis.
Q: Can I use BLM03BD121SN1D instead of Z0201C121BSMST?
A: Yes, with the following consideration: BLM03BD121SN1D has a higher current rating of 250mA compared to the original 200mA specification. All other electrical parameters (120 Ohms @ 100 MHz, 500mOhm DC resistance) and mechanical specifications are identical. This part is suitable for applications where the original 200mA rating is adequate or where higher current capacity is beneficial.
Q: What is the difference between Cut Tape and Tape & Reel packaging?
A: Cut Tape (CT) & Digi-Reel® packaging is supplied in individual tape segments suitable for manual handling and smaller volume applications. Tape & Reel (TR) packaging is supplied on continuous reels suitable for automated assembly equipment and higher volume production. Both packaging types contain identical components; the difference is in supply format and handling method.
Q: Are all substitute parts RoHS3 compliant?
A: All recommended substitute parts listed are RoHS3 compliant or RoHS compliant. Compliance certifications are provided in the parameter comparison table. All parts maintain MSL 1 (Unlimited) moisture sensitivity level.
Q: Can MMZ0603S241CT000 (240 Ohm) be used in place of Z0201C121BSMST (120 Ohm)?
A: No, not without circuit analysis and validation. MMZ0603S241CT000 has double the impedance (240 Ohms vs. 120 Ohms @ 100 MHz). This will significantly alter the filtering characteristics and EMI suppression performance of the circuit. Use only if the application specifically requires 240 Ohm impedance.
Q: What is the significance of DC resistance (DCR) differences between parts?
A: DC resistance affects power dissipation and signal insertion loss. The original Z0201C121BSMST specifies 500mOhm maximum DC resistance. Substitute parts with lower DC resistance (450mOhm) will dissipate less power and introduce less signal loss. Substitute parts with higher DC resistance (570mOhm) will dissipate more power. For most signal line applications, these differences are negligible; however, high-current or noise-sensitive applications should verify compatibility.
Q: Are all parts available in the same physical dimensions?
A: Yes. All substitute parts listed maintain the 0201 (0603 Metric) package specification with dimensions of 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum height of 0.013" (0.33mm). All parts are surface mount components suitable for automated assembly on standard PCB layouts.
Q: What is the operating temperature range for all substitute parts?
A: All substitute parts operate across the same temperature range as the original Z0201C121BSMST: -55°C to 125°C. This specification is consistent across all recommended alternatives.
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