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PM20-8R2K Equivalent & Substitute Parts
Part Overview
The PM20-8R2K is an 8.2 µH unshielded molded inductor manufactured by Bourns Inc., rated for 170 mA with a maximum DC resistance of 2.3Ohm. This component operates across the temperature range of -55°C to 125°C in a 1210 (3225 Metric) surface mount package. The part is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 8.2 µH |
| Tolerance | ±10% |
| Current Rating | 170 mA |
| DC Resistance (Max) | 2.3Ohm |
| Core Material | Ferrite |
| Shielding | Unshielded |
| Package | 1210 (3225 Metric) |
| Operating Temperature | -55°C to 125°C |
| Q @ 7.96 MHz | 30 |
| Self Resonant Frequency | 40 MHz |
Substitute Part Grouping Explanation
Substitution eligibility for the PM20-8R2K is determined by the following critical parameters: inductance value (8.2 µH), current rating capability, DC resistance specification, core material compatibility, package form factor, and operating temperature range. All identified substitute parts maintain the 8.2 µH inductance value and ferrite or iron powder core construction. Current rating and DC resistance are the primary differentiators among candidates. Parts with current ratings at or above 170 mA and DC resistance at or below 2.3Ohm are electrically compatible. Physical dimensions and mounting type must align with 1210 (3225 Metric) surface mount requirements.
Parameter Comparison
| Parameter | PM20-8R2K (Main) | CM322522-8R2JL | CM322522-8R2KL | 1210-822J | IMC1210EB8R2K |
|---|---|---|---|---|---|
| Manufacturer | Bourns Inc. | Bourns Inc. | Bourns Inc. | API Delevan Inc. | Vishay Dale |
| Inductance | 8.2 µH | 8.2 µH | 8.2 µH | 8.2 µH | 8.2 µH |
| Tolerance | ±10% | ±5% | ±10% | ±5% | ±10% |
| Current Rating (mA) | 170 | 140 | 140 | 305 | 194 |
| DC Resistance (Max) | 2.3Ohm | 2Ohm | 2Ohm | 2Ohm | 2Ohm |
| Core Material | Ferrite | Ferrite | Ferrite | Ferrite | Iron Powder |
| Shielding | Unshielded | Unshielded | Unshielded | Unshielded | Unshielded |
| Package | 1210 (3225 Metric) | Nonstandard | Nonstandard | 1210 (3225 Metric) | 1210 (3225 Metric) |
| Operating Temperature | -55°C to 125°C | -40°C to 125°C | -40°C to 125°C | -55°C to 125°C | -55°C to 125°C |
| Q @ 7.96 MHz | 30 | 30 | 30 | 30 @ 7.9 MHz | 30 |
| Self Resonant Frequency | 40 MHz | 40 MHz | 40 MHz | 35 MHz | 38 MHz |
| Product Status | Obsolete | Active | Active | Active | Active |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant | Non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
CM322522-8R2KL and CM322522-8R2JL are both active Bourns products with ROHS3 compliance, offering direct electrical compatibility with the PM20-8R2K. However, both use nonstandard package geometry, requiring mechanical verification before implementation. The 1210-822J from API Delevan Inc. maintains standard 1210 (3225 Metric) package dimensions and offers superior current rating (305 mA), though it does not meet RoHS compliance. The IMC1210EB8R2K from Vishay Dale provides ROHS3 compliance, standard 1210 package form, and adequate current rating (194 mA), making it suitable for applications requiring regulatory compliance and standard package compatibility. Selection should prioritize product status (active vs. obsolete), compliance requirements, and mechanical package constraints specific to the application.
Frequently Asked Questions (FAQ)
Q: Can CM322522-8R2JL or CM322522-8R2KL directly replace PM20-8R2K? A: Both parts maintain identical inductance (8.2 µH), equivalent Q factor (30 @ 7.96 MHz), and self-resonant frequency (40 MHz). However, both use nonstandard package geometry rather than standard 1210 (3225 Metric), requiring mechanical layout verification. Current ratings of 140 mA are below the original 170 mA specification.
Q: What is the impact of lower current rating in substitute parts? A: CM322522-8R2JL and CM322522-8R2KL are rated for 140 mA versus the original 170 mA. Applications operating at or below 140 mA are unaffected. Circuits requiring the full 170 mA rating should use 1210-822J (305 mA) or IMC1210EB8R2K (194 mA).
Q: Does package form factor affect electrical performance? A: The nonstandard package used by CM322522 series parts maintains equivalent electrical characteristics (inductance, Q, resonant frequency) but requires PCB layout modification. Standard 1210 packages (1210-822J, IMC1210EB8R2K) provide direct mechanical compatibility.
Q: Which substitute offers the best compliance profile? A: IMC1210EB8R2K and both CM322522 variants are ROHS3 compliant. The 1210-822J does not meet RoHS requirements. For applications requiring regulatory compliance, IMC1210EB8R2K combines ROHS3 certification with standard 1210 package compatibility.
Q: Are there temperature range limitations with substitute parts? A: CM322522-8R2JL and CM322522-8R2KL operate from -40°C to 125°C, narrower than the original -55°C to 125°C range. Applications requiring -55°C operation must use 1210-822J or IMC1210EB8R2K, both rated to -55°C.
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