Request Quote
(Ships tomorrow)
PM40-470K Equivalent & Substitute Parts
Part Overview
The PM40-470K is a 47 µH unshielded molded inductor manufactured by Bourns Inc., rated for 140 mA with a maximum DC resistance of 5Ohm. This component operates across -55°C to 125°C and is packaged in the 1812 (4532 Metric) surface mount form factor. The PM40-470K is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 47 µH |
| Inductance Tolerance | ±10% |
| Current Rating | 140 mA |
| DC Resistance (Max) | 5Ohm |
| Package / Case | 1812 (4532 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 125°C |
| Shielding | Unshielded |
| Q @ Frequency | 50 @ 2.52MHz |
| Frequency - Self Resonant | 10MHz |
Substitute Part Grouping Explanation
Substitute parts for the PM40-470K are classified based on strict electrical and mechanical compatibility:
Direct Substitutes (Bourns CM45 Series): CM453232-470KL and CM453232-470JL maintain identical inductance (47 µH), current rating (140 mA), DC resistance (5Ohm max), package (1812), and test frequency (2.52 MHz). Both are active products with RoHS3 compliance. The primary difference is inductance tolerance: CM453232-470KL matches the ±10% tolerance of the original part, while CM453232-470JL offers tighter ±5% tolerance. Operating temperature range differs slightly (-40°C ~ 125°C versus -55°C ~ 125°C).
Similar Substitutes (Cross-Manufacturer): 1812-473J (API Delevan), 3613C470K (TE Connectivity), and 744766147 (Würth Elektronik) share the same inductance value, DC resistance, package, and mounting type. These parts maintain 47 µH inductance and 5Ohm maximum DC resistance. Variations exist in current rating (1812-473J: 200 mA), operating temperature range, and core material composition. All are active products with current availability.
Substitution Criteria: All listed parts maintain the critical electrical parameters: 47 µH inductance, 5Ohm maximum DC resistance, and 1812 surface mount package. Mechanical compatibility is ensured through identical package designation and similar physical dimensions.
Parameter Comparison
| Parameter | PM40-470K (Main) | CM453232-470KL | CM453232-470JL | 1812-473J | 3613C470K | 744766147 |
|---|---|---|---|---|---|---|
| Manufacturer | Bourns Inc. | Bourns Inc. | Bourns Inc. | API Delevan Inc. | TE Connectivity | Würth Elektronik |
| Inductance | 47 µH | 47 µH | 47 µH | 47 µH | 47 µH | 47 µH |
| Inductance Tolerance | ±10% | ±10% | ±5% | ±5% | ±10% | ±10% |
| Current Rating (Amps) | 140 mA | 140 mA | 140 mA | 200 mA | 140 mA | 140 mA |
| DC Resistance (Max) | 5Ohm | 5Ohm | 5Ohm | 5Ohm | 5Ohm | 5Ohm |
| Package / Case | 1812 (4532 Metric) | 1812 (4532 Metric) | 1812 (4532 Metric) | 1812 (4532 Metric) | 1812 (4532 Metric) | 1812 (4532 Metric) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Operating Temperature | -55°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -55°C ~ 125°C | -30°C ~ 100°C | -40°C ~ 105°C |
| Q @ Frequency | 50 @ 2.52MHz | 50 @ 2.52MHz | 50 @ 2.52MHz | 50 @ 2.5MHz | 50 @ 2.52MHz | 50 @ 2.52MHz |
| Frequency - Self Resonant | 10MHz | 10MHz | 10MHz | 10MHz | 10MHz | 12MHz |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: CM453232-470KL is the preferred direct substitute. It is manufactured by Bourns Inc., maintains identical electrical specifications (47 µH, ±10% tolerance, 140 mA, 5Ohm DCR), and is ROHS3 compliant with active product status. Inventory availability is substantial (25,100 pcs). The operating temperature range (-40°C ~ 125°C) is slightly reduced compared to the original part; applications requiring -55°C operation must account for this limitation.
Secondary Recommendation: CM453232-470JL offers tighter inductance tolerance (±5%) while maintaining all other critical electrical parameters. This option is suitable for applications with stricter inductance specifications. Inventory is lower (1,663 pcs) and operating temperature range is identical to CM453232-470KL.
Cross-Manufacturer Alternatives: 3613C470K (TE Connectivity) and 744766147 (Würth Elektronik) are ROHS3 compliant active products with identical inductance and DC resistance specifications. Both support the full -55°C to 125°C temperature range requirement. 3613C470K has good inventory (2,126 pcs) and maintains the original operating temperature floor. 744766147 provides the highest self-resonant frequency (12MHz) and adequate inventory (2,400 pcs), though operating temperature is limited to -40°C minimum.
Non-Recommended: 1812-473J (API Delevan) is not RoHS3 compliant and does not meet modern regulatory requirements for new designs.
Frequently Asked Questions (FAQ)
Q: Can CM453232-470KL be used as a direct replacement for PM40-470K?
A: Yes. Both parts share identical inductance (47 µH), inductance tolerance (±10%), current rating (140 mA), DC resistance (5Ohm max), and package (1812 surface mount). The primary consideration is the reduced operating temperature minimum (-40°C versus -55°C). Applications operating above -40°C encounter no functional differences.
Q: What is the difference between CM453232-470KL and CM453232-470JL?
A: Both are Bourns CM45 series parts with identical electrical performance at nominal values. CM453232-470JL specifies ±5% inductance tolerance compared to ±10% for CM453232-470KL. Applications requiring tighter inductance control should specify CM453232-470JL. Operating temperature ranges are identical between both variants.
Q: Are all substitute parts RoHS compliant?
A: No. CM453232-470KL, CM453232-470JL, 3613C470K, and 744766147 are ROHS3 compliant. The 1812-473J part is RoHS non-compliant and is not recommended for new designs subject to RoHS regulations.
Q: Does package size differ between substitute parts?
A: All substitute parts use the 1812 (4532 Metric) package. Physical dimensions are nominally identical (0.177" L x 0.126" W / 4.50mm x 3.20mm). Height variations exist: PM40-470K and substitute parts range from 0.126" to 0.142" (3.20mm to 3.60mm). These variations are within standard PCB assembly tolerances for surface mount components.
Q: Which substitute part has the best availability?
A: CM453232-470KL has the highest inventory (25,100 pcs new original in stock), making it the most readily available option for immediate procurement.
Q: Can I use 1812-473J as a substitute?
A: 1812-473J maintains the same inductance, DC resistance, and package specifications. However, it is RoHS non-compliant and not recommended for new designs. Additionally, it is not ROHS3 compliant, which may conflict with procurement and regulatory requirements.
Q: What is the impact of operating temperature range differences?
A: The PM40-470K operates from -55°C to 125°C. Most substitute parts (CM45 series, 744766147) operate from -40°C minimum. Applications requiring operation below -40°C must retain the original PM40-470K or select 1812-473J or 3613C470K, which support -55°C operation. 3613C470K is ROHS3 compliant and recommended for low-temperature applications.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts