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LSMGA201208T121RG Equivalent & Substitute Parts
Part Overview
The LSMGA201208T121RG is a 120 Ohm ferrite bead manufactured by Taiyo Yuden, designed for power line filtering applications in 0805 (2012 Metric) surface mount packages. This component operates at 2.5A maximum current with 32mOhm DC resistance and maintains performance across the -40°C to 125°C temperature range. The part is classified as Active and carries ROHS3 compliance certification.
Substitute parts are necessary when the primary part experiences inventory constraints, extended lead times, or when design requirements permit alternative manufacturers with equivalent electrical and mechanical specifications. The substitute parts listed maintain identical or superior performance characteristics within the same package footprint.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Impedance @ 100 MHz | 120 | Ohms |
| Current Rating (Maximum) | 2.5 | Amperes |
| DC Resistance (Maximum) | 32 | mOhm |
| Package / Case | 0805 (2012 Metric) | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -40 to 125 | °C |
| Filter Type | Power Line | — |
| Number of Lines | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following critical parameters:
Primary Matching Criteria:
- Impedance @ 100 MHz: 120 Ohms (exact match required for primary substitutes)
- Package / Case: 0805 (2012 Metric) (mandatory for mechanical compatibility)
- Mounting Type: Surface Mount (required for PCB assembly compatibility)
- Number of Lines: 1 (functional requirement)
Secondary Compatibility Criteria:
- Current Rating (Maximum): Equal to or greater than 2.5A
- DC Resistance (Maximum): Equal to or less than 32mOhm
- Operating Temperature Range: Must encompass or exceed -40°C to 125°C
- RoHS Status: ROHS3 Compliant (regulatory requirement)
- Moisture Sensitivity Level: 1 (Unlimited) preferred
Substitute parts are grouped into two categories:
Category A - Full Electrical & Mechanical Equivalents (120 Ohm @ 100 MHz): Parts meeting all primary criteria with identical impedance specification. These parts are direct substitutes with no circuit redesign required.
Category B - Parametric Alternatives (100 Ohm @ 100 MHz or Enhanced Current Rating): Parts with minor impedance deviation (100 Ohm) or different filter type classification but maintaining 0805 package and surface mount compatibility. These parts require circuit validation before substitution.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Impedance @ 100 MHz (Ohms) | Current Rating Max (A) | DC Resistance Max (mOhm) | Operating Temp Range (°C) | Filter Type | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| LSMGA201208T121RG | Taiyo Yuden | 120 | 2.5 | 32 | -40 to 125 | Power Line | Active | ROHS3 Compliant |
| FBMH2012HM121-T | Taiyo Yuden | 120 | 2.5 | 32 | -40 to 125 | Power Line | Not For New Designs | ROHS3 Compliant |
| 742792023 | Würth Elektronik | 120 | 3 | 30 | -55 to 125 | Signal Line | Active | ROHS3 Compliant |
| BBUP00201209101Y00 | Pulse Electronics | 100 | 5 | 20 | -55 to 125 | — | Active | ROHS3 Compliant |
| BBUP00201209121Y00 | Pulse Electronics | 120 | 5 | 20 | -55 to 125 | — | Active | ROHS3 Compliant |
| BLM21PG121SN1D | Murata Electronics | 120 | 3 | 30 | -55 to 125 | Power Line | Active | ROHS3 Compliant |
| FBU201209T-121Y-S-H | Cal-Chip Electronics, Inc. | 120 | 5 | 15 | -55 to 125 | Power Line | Active | RoHS Compliant |
| HI0805O121R-10 | Laird-Signal Integrity Products | 120 | 3.5 | 20 | -40 to 125 | Power, Signal Line | Active | ROHS3 Compliant |
| ILHB0805ER121V | Vishay Dale | 120 | 5 | 20 | -55 to 125 | — | Active | ROHS3 Compliant |
| MPZ2012S101AT000 | TDK Corporation | 100 | 4 | 20 | -55 to 125 | Power Line | Active | ROHS3 Compliant |
| WLBD2012HCU121TH | Walsin Technology Corporation | 120 | 5 | 20 | -55 to 125 | Power Line | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Tier 1 - Direct Substitutes (Recommended for New Designs):
The following parts are Active status with ROHS3 compliance and maintain 120 Ohm impedance @ 100 MHz with equal or superior current ratings and lower DC resistance:
- BBUP00201209121Y00 (Pulse Electronics): 120 Ohms, 5A rating, 20mOhm DCR, Active status, extended temperature range (-55°C to 125°C)
- BLM21PG121SN1D (Murata Electronics): 120 Ohms, 3A rating, 30mOhm DCR, Active status, Power Line filter type, extended temperature range
- FBU201209T-121Y-S-H (Cal-Chip Electronics, Inc.): 120 Ohms, 5A rating, 15mOhm DCR, Active status, Power Line filter type, extended temperature range
- HI0805O121R-10 (Laird-Signal Integrity Products): 120 Ohms, 3.5A rating, 20mOhm DCR, Active status, dual Power/Signal Line capability
- ILHB0805ER121V (Vishay Dale): 120 Ohms, 5A rating, 20mOhm DCR, Active status, extended temperature range
- WLBD2012HCU121TH (Walsin Technology Corporation): 120 Ohms, 5A rating, 20mOhm DCR, Active status, Power Line filter type, extended temperature range
Tier 2 - Conditional Substitutes (Requires Circuit Validation):
- 742792023 (Würth Elektronik): 120 Ohms, 3A rating, 30mOhm DCR, Active status, Signal Line classification (differs from Power Line), extended temperature range
- FBMH2012HM121-T (Taiyo Yuden): Identical electrical specifications to LSMGA201208T121RG but marked "Not For New Designs" — use only for legacy design maintenance
Tier 3 - Parametric Alternatives (100 Ohm @ 100 MHz):
- BBUP00201209101Y00 (Pulse Electronics): 100 Ohms, 5A rating, 20mOhm DCR, Active status
- MPZ2012S101AT000 (TDK Corporation): 100 Ohms, 4A rating, 20mOhm DCR, Active status, Power Line filter type
These parts require impedance verification in the target circuit before substitution.
Frequently Asked Questions (FAQ)
Q: Can BBUP00201209121Y00 replace LSMGA201208T121RG directly?
A: Yes. Both parts maintain 120 Ohm impedance @ 100 MHz, 0805 package, surface mount configuration, and ROHS3 compliance. BBUP00201209121Y00 provides superior current rating (5A vs. 2.5A) and lower DC resistance (20mOhm vs. 32mOhm), making it a direct substitute with enhanced performance margin.
Q: What is the difference between Power Line and Signal Line filter types?
A: Filter type classification indicates the intended application. Power Line ferrite beads are optimized for power supply filtering, while Signal Line beads are optimized for signal integrity. The 742792023 (Würth Elektronik) is classified as Signal Line but maintains identical impedance and package specifications. Circuit validation is required before substitution.
Q: Why is FBMH2012HM121-T marked "Not For New Designs"?
A: This designation indicates the part is in mature or declining production phase. While electrically identical to LSMGA201208T121RG, Taiyo Yuden recommends using alternative parts for new designs. Use FBMH2012HM121-T only for legacy product maintenance or repair.
Q: Can I use a 100 Ohm ferrite bead instead of 120 Ohm?
A: Substitution of 100 Ohm parts (BBUP00201209101Y00 or MPZ2012S101AT000) requires circuit validation. The impedance difference affects filtering performance. Verify that the lower impedance value meets your EMI suppression requirements before implementation.
Q: Are all substitute parts ROHS3 compliant?
A: All listed substitutes carry ROHS3 compliance except FBU201209T-121Y-S-H, which carries RoHS Compliant certification. Both certifications meet regulatory requirements; verify your specific compliance requirements before selection.
Q: What is the significance of DC Resistance (DCR) differences?
A: Lower DCR reduces power dissipation and heat generation. LSMGA201208T121RG specifies 32mOhm maximum DCR. Substitute parts with lower DCR (15mOhm to 20mOhm) provide improved thermal performance. Higher DCR values are not acceptable substitutes.
Q: Do all substitute parts fit the same PCB footprint?
A: Yes. All listed substitutes use 0805 (2012 Metric) package with surface mount configuration. Physical dimensions are equivalent (0.079" L x 0.049" W / 2.00mm x 1.25mm). Height variations (0.026" to 0.043") are within standard PCB assembly tolerances.
Q: Which substitute offers the best current rating?
A: Multiple substitutes offer 5A current rating: BBUP00201209121Y00, FBU201209T-121Y-S-H, ILHB0805ER121V, and WLBD2012HCU121TH. All maintain 120 Ohm impedance and 0805 package. Selection should be based on availability, lead time, and cost considerations.
Q: What is Moisture Sensitivity Level (MSL) 1?
A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed substitutes carry MSL 1 (Unlimited) or Not Applicable designation, ensuring compatibility with standard storage and handling procedures.
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