PM3700-30 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The PM3700-30 is a 750 µH, 2-line common mode choke manufactured by Bourns Inc., designed for surface mount applications with a maximum current rating of 5.5A and DC resistance of 12mOhm. This part operates across the temperature range of -55°C to 125°C and is housed in a horizontal, 4 PC pad package measuring 0.850" × 0.850" × 0.450" (21.60mm × 21.60mm × 11.43mm).

The PM3700-30 is classified as obsolete. Direct substitutes with identical electrical and mechanical specifications are available in active product status, making component replacement straightforward for ongoing designs and production requirements.

Substiute Parts

PM3700-30

Bourns Inc.In Stock: 710PM3700-30 Datasheet

Current PartRFQ

PM3700-30-RC

Bourns Inc.In Stock: 2406PM3700-30-RC Datasheet

DirectRFQ

PM3700-20-RC

Bourns Inc.In Stock: 1616PM3700-20-RC Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM3700-30 are classified into two categories based on electrical parameter alignment:

Direct Manufacturer Substitute (Identical Specifications) The PM3700-30-RC maintains all electrical and mechanical parameters identical to the PM3700-30: 750 µH inductance, 5.5A current rating, 12mOhm DCR, and identical physical dimensions. The only difference is packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete). This part is a direct replacement requiring no circuit redesign.

Parametric Equivalent (Related Specifications) The PM3700-20-RC operates within the PM3700 series with the same physical footprint and mounting configuration but with different electrical characteristics: 500 µH inductance, 6A current rating, and 10mOhm DCR. This part is suitable only when the application can tolerate lower inductance and higher current capacity. Selection requires verification that the lower inductance value meets circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Option) Select PM3700-30-RC when the original PM3700-30 is no longer available. This part provides identical electrical performance and physical compatibility. The transition from obsolete to active product status ensures long-term supply availability. The upgrade to ROHS3 compliance improves environmental and regulatory standing for new production runs.

For Parametric Equivalent Selection The PM3700-20-RC is suitable only when circuit design permits lower inductance (500 µH vs. 750 µH) and the application benefits from higher current capacity (6A vs. 5.5A). Lower DCR (10mOhm vs. 12mOhm) reduces power dissipation. This selection requires circuit-level analysis to confirm that reduced inductance does not compromise filtering performance or signal integrity.

Both substitute options maintain identical physical dimensions, thermal operating range, and mounting configuration, ensuring PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can PM3700-30-RC be used as a direct drop-in replacement for PM3700-30? A: Yes. The PM3700-30-RC is electrically and mechanically identical to the PM3700-30. The only differences are product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. bulk). No circuit modifications are required.

Q: What is the difference between PM3700-30-RC and PM3700-20-RC? A: PM3700-30-RC maintains the original 750 µH inductance and 5.5A current rating. PM3700-20-RC has lower inductance (500 µH) and higher current capacity (6A). Selection depends on whether the application can operate with reduced inductance values.

Q: Are all three parts compatible with the same PCB footprint? A: Yes. All three parts share identical physical dimensions (0.850" × 0.850" × 0.450"), package type (Horizontal, 4 PC Pad), and mounting configuration (Surface Mount). PCB layout requires no modification when switching between these parts.

Q: What is the significance of the packaging format difference (bulk vs. Tape & Reel)? A: Tape & Reel (TR) packaging is standard for automated assembly and high-volume production. Bulk packaging is typically used for lower-volume or manual assembly applications. Electrical and mechanical performance is identical; packaging format affects only handling and assembly processes.

Q: Does the RoHS3 compliance of the substitute parts affect compatibility? A: No. RoHS3 compliance is an environmental and regulatory attribute that improves the part's suitability for modern production standards. It does not alter electrical performance or physical compatibility. Upgrading to RoHS3-compliant parts is beneficial for regulatory compliance.

Q: Can PM3700-20-RC replace PM3700-30 in all applications? A: No. PM3700-20-RC has different electrical specifications (500 µH vs. 750 µH inductance). It is suitable only for applications where lower inductance is acceptable and higher current capacity is beneficial. Circuit analysis is required to confirm compatibility.