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PM105S-680M Equivalent & Substitute Parts Reference
Part Overview
The PM105S-680M is a 68 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 970 mA continuous current with a maximum DC resistance of 220mOhm. This component features ferrite core construction with nonstandard packaging and operates across the temperature range of -30°C to 100°C.
The PM105S-680M has reached obsolete product status. Locating equivalent or substitute components is necessary to support ongoing design requirements, system maintenance, and production continuity. Active alternatives with comparable electrical characteristics and improved availability are available from the same manufacturer.
Substiute Parts
Key Parameters
| Parameter | PM105S-680M |
|---|---|
| Inductance | 68 µH |
| Current Rating | 970 mA |
| DC Resistance (DCR) | 220mOhm Max |
| Core Type | Ferrite Drum Core, Shielded |
| Tolerance | ±20% |
| Operating Temperature | -30°C ~ 100°C |
| Mounting Type | Surface Mount |
| Self Resonant Frequency | 11 MHz |
| RoHS Status | Non-compliant |
Substitute Part Grouping Explanation
Substitute components for the PM105S-680M are selected based on the following critical parameters:
- Inductance Value: 68 µH (exact match required)
- Current Rating: Minimum 970 mA to support original application requirements
- DC Resistance: Maximum 220mOhm to maintain electrical performance
- Core Material: Ferrite construction
- Mounting Type: Surface mount configuration
- Shielding: Electromagnetic shielding characteristics
The two substitute parts identified—SDR1006-680KL and SRR0908-680ML—both maintain the 68 µH inductance specification and support current ratings exceeding the original 970 mA requirement. Both are active products with improved compliance certifications and enhanced availability compared to the obsolete PM105S-680M.
Parameter Comparison
| Parameter | PM105S-680M | SDR1006-680KL | SRR0908-680ML |
|---|---|---|---|
| Inductance | 68 µH | 68 µH | 68 µH |
| Current Rating (Amps) | 970 mA | 1.1 A | 1.25 A |
| DC Resistance (DCR) | 220mOhm Max | 220mOhm Max | 184mOhm Max |
| Tolerance | ±20% | ±10% | ±20% |
| Core Type | Ferrite Drum Core, Shielded | Ferrite Drum Core, Unshielded | Ferrite Drum Core, Shielded |
| Operating Temperature | -30°C ~ 100°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Self Resonant Frequency | 11 MHz | 7 MHz | 2.5 MHz |
| Product Status | Obsolete | Active | Active |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
SDR1006-680KL is an active product with ROHS3 compliance and an extended operating temperature range (-40°C to 125°C). This unshielded variant provides a 1.1 A current rating with tighter inductance tolerance (±10%) and equivalent DC resistance. The unshielded configuration reduces electromagnetic interference containment compared to the original shielded design.
SRR0908-680ML maintains shielded construction matching the original PM105S-680M architecture. This component offers the highest current rating (1.25 A) and the lowest DC resistance (184mOhm Max), delivering improved thermal performance. ROHS3 compliance and extended temperature range (-40°C to 125°C) support modern manufacturing and environmental standards. The 8-SMD gull wing package differs from the nonstandard original packaging.
Both substitutes are manufactured by Bourns Inc. and carry REACH Unaffected and EAR99 ECCN classifications, matching the regulatory profile of the original component.
Frequently Asked Questions (FAQ)
Q: Can SDR1006-680KL replace PM105S-680M in shielded applications?
A: SDR1006-680KL is an unshielded variant. Applications requiring electromagnetic shielding should use SRR0908-680ML instead, which maintains the shielded drum core construction of the original PM105S-680M.
Q: What is the impact of the ±10% tolerance in SDR1006-680KL versus ±20% in the original?
A: The tighter ±10% tolerance in SDR1006-680KL provides improved inductance accuracy. This is beneficial for applications with strict inductance specifications but does not prevent substitution in designs tolerating ±20% variation.
Q: Are there package compatibility considerations?
A: The original PM105S-680M uses nonstandard packaging. SRR0908-680ML employs 8-SMD gull wing packaging, which may require PCB layout modifications. SDR1006-680KL maintains nonstandard packaging similar to the original. Verify footprint compatibility before design implementation.
Q: Do the substitute parts support the original operating temperature range?
A: Both substitutes extend the operating temperature range to -40°C ~ 125°C, exceeding the original -30°C ~ 100°C specification. This provides improved thermal margin for demanding applications.
Q: What is the significance of DC resistance differences?
A: SRR0908-680ML offers 184mOhm Max DCR compared to 220mOhm Max in the original and SDR1006-680KL. Lower DC resistance reduces resistive losses and heat generation, improving efficiency in current-carrying applications.
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