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Equivalent & Substitute Parts for PM40-1R0K
Part Overview
The Bourns PM40-1R0K is a 1 µH unshielded molded inductor rated for 450 mA with a maximum DC resistance of 500 mOhm, packaged in 1812 (4532 Metric) surface mount format. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 1 µH |
| Current Rating | 450 mA |
| DC Resistance (DCR) | 500 mOhm Max |
| Package / Case | 1812 (4532 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 125°C |
| Shielding | Unshielded |
| Q @ Frequency | 50 @ 7.96 MHz |
| Frequency - Self Resonant | 100 MHz |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:
- Inductance Value: 1 µH (exact match required)
- Current Rating: Minimum 450 mA
- DC Resistance: Maximum 500 mOhm
- Package: 1812 (4532 Metric) surface mount
- Shielding: Unshielded
- Operating Temperature: Must support -55°C to 125°C range or equivalent operational envelope
- Q Factor & Self-Resonant Frequency: 50 @ 7.96 MHz and 100 MHz respectively
Parts are classified as direct equivalents when all parameters match within specified tolerances. Similar parts meeting the core electrical requirements but with variations in core material, tolerance, or compliance status are listed separately.
Parameter Comparison
| Part Number | Manufacturer | Inductance | Current Rating (mA) | DCR (Max) | Core Type | Tolerance | Operating Temp | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| PM40-1R0K | Bourns Inc. | 1 µH | 450 | 500 mOhm | Iron Powder | ±10% | -55°C ~ 125°C | Obsolete | Non-compliant |
| CM453232-1R0JL | Bourns Inc. | 1 µH | 450 | 500 mOhm | Ferrite | ±5% | -40°C ~ 125°C | Active | ROHS3 Compliant |
| CM453232-1R0KL | Bourns Inc. | 1 µH | 450 | 500 mOhm | Ferrite | ±10% | -40°C ~ 125°C | Active | ROHS3 Compliant |
| 1812-102J | API Delevan Inc. | 1 µH | 634 | 500 mOhm | Ferrite | ±5% | -55°C ~ 125°C | Active | Non-compliant |
| 3613C1R0K | TE Connectivity Passive Product | 1 µH | 450 | 500 mOhm | Ferrite | ±20% | -30°C ~ 100°C | Active | ROHS3 Compliant |
| 74476601 | Würth Elektronik | 1 µH | 450 | 500 mOhm | Ferrite | ±10% | -40°C ~ 105°C | Active | ROHS3 Compliant |
| IMC1812BN1R0K | Vishay Dale | 1 µH | 450 | 500 mOhm | Iron Powder | ±10% | -55°C ~ 125°C | Active | Non-compliant |
| IMC1812ER1R0K | Vishay Dale | 1 µH | 450 | 500 mOhm | Iron Powder | ±10% | -55°C ~ 125°C | Active | ROHS3 Compliant |
| IMC1812ES1R0K | Vishay Dale | 1 µH | 450 | 500 mOhm | Iron Powder | ±10% | -55°C ~ 125°C | Active | ROHS3 Compliant |
| IMC1812ET1R0K | Vishay Dale | 1 µH | 450 | 500 mOhm | Iron Powder | ±10% | -55°C ~ 125°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Bourns Manufacturer)
CM453232-1R0KL and CM453232-1R0JL are active Bourns products meeting all electrical specifications of the PM40-1R0K. Both are ROHS3 compliant and available in production quantities. CM453232-1R0KL maintains ±10% tolerance matching the original part, while CM453232-1R0JL offers tighter ±5% tolerance. Operating temperature range is -40°C to 125°C, which covers the primary operational envelope of the obsolete part.
Vishay Dale Equivalents
IMC1812ER1R0K, IMC1812ES1R0K, and IMC1812ET1R0K are active Vishay Dale products with identical electrical ratings and full temperature range support (-55°C to 125°C). All three are ROHS3 compliant. These parts use iron powder cores matching the original PM40-1R0K construction and are available in production volumes.
Alternative Manufacturers
API Delevan 1812-102J provides higher current capacity (634 mA) with identical inductance and DCR specifications. It maintains the full -55°C to 125°C temperature range but is not RoHS compliant. Würth Elektronik 74476601 meets all electrical requirements with ROHS3 compliance and -40°C to 105°C operating range. TE Connectivity 3613C1R0K is ROHS3 compliant but operates within -30°C to 100°C range and carries ±20% tolerance.
Frequently Asked Questions (FAQ)
Q: Can CM453232-1R0KL directly replace PM40-1R0K in existing designs?
A: Yes. Both parts share identical inductance (1 µH), current rating (450 mA), and DC resistance (500 mOhm Max) specifications. Package dimensions are 1812 (4532 Metric) surface mount. The primary difference is core material (ferrite vs. iron powder) and operating temperature floor (-40°C vs. -55°C). If your application operates above -40°C, this substitution is electrically and mechanically compatible.
Q: What is the difference between CM453232-1R0JL and CM453232-1R0KL?
A: Both are Bourns CM45 series inductors with identical electrical ratings and package specifications. The primary distinction is inductance tolerance: CM453232-1R0JL specifies ±5% tolerance while CM453232-1R0KL specifies ±10% tolerance. Selection depends on circuit tolerance requirements.
Q: Are Vishay Dale IMC1812 parts suitable replacements?
A: Yes. IMC1812ER1R0K, IMC1812ES1R0K, and IMC1812ET1R0K meet all electrical specifications and support the full -55°C to 125°C temperature range. All three are ROHS3 compliant and use iron powder cores, maintaining closer electrical characteristics to the original PM40-1R0K than ferrite-core alternatives.
Q: Does operating temperature range affect substitution eligibility?
A: Operating temperature range is a critical selection parameter. The PM40-1R0K operates from -55°C to 125°C. Substitutes with narrower ranges (such as 3613C1R0K at -30°C to 100°C or 74476601 at -40°C to 105°C) are suitable only if your application does not require the full original temperature envelope.
Q: What is the significance of RoHS compliance status?
A: RoHS compliance indicates conformance to Restriction of Hazardous Substances regulations. ROHS3-compliant parts (CM453232 series, Würth 74476601, and Vishay IMC1812ER/ES/ET variants) are preferred for new designs and regulated markets. Non-compliant alternatives (PM40-1R0K, IMC1812BN1R0K, 1812-102J) may be restricted in certain applications or regions.
Q: Can I use 1812-102J as a substitute despite higher current rating?
A: Yes. The 1812-102J provides 634 mA current capacity, exceeding the 450 mA requirement. Inductance, DCR, and package specifications match the PM40-1R0K. However, it is not RoHS compliant and operates within the same -55°C to 125°C range. Use this part only if RoHS non-compliance is acceptable for your application.
Q: How do core material differences affect performance?
A: PM40-1R0K uses iron powder core construction. Ferrite-core alternatives (CM453232 series, Würth 74476601, TE Connectivity 3613C1R0K) exhibit different frequency response and Q-factor characteristics. Iron powder cores (Vishay IMC1812 series) maintain closer electrical behavior to the original part. Core material selection should align with circuit frequency response requirements.
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