PM74SH-331M-RC Equivalent & Substitute Parts

Part Overview

The PM74SH-331M-RC is a 330 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 400 mA continuous current with a maximum DC resistance of 730 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is ROHS3 compliant. The part is currently active in production with 898 pieces available in stock. Substitute parts are identified when equivalent inductance values, shielding characteristics, and core materials are maintained within acceptable tolerance ranges while accommodating different current ratings and DC resistance specifications.

Substiute Parts

PM74SH-331M-RC

Bourns Inc.In Stock: 943PM74SH-331M-RC Datasheet

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SRR7045-331M

Bourns Inc.In Stock: 2141SRR7045-331M Datasheet

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P1167.334NLT

Pulse ElectronicsIn Stock: 3684P1167.334NLT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM74SH-331M-RC are qualified based on the following criteria:

Primary Matching Parameters:

• Inductance value of 330 µH maintained within ±20% tolerance
• Shielded construction to prevent electromagnetic interference
• Surface mount packaging in nonstandard form factor
• Operating temperature range compatibility (-40°C minimum, 125°C minimum upper limit)
• ROHS3 compliance and MSL 1 rating

Acceptable Variation Parameters:

• Current rating may differ provided the application does not exceed the substitute part's maximum rating
• DC resistance may vary within the constraints of the application's power dissipation budget
• Saturation current (Isat) may differ as long as the operating current remains below saturation limits
• Self-resonant frequency may vary within acceptable bounds for the intended frequency of operation

The SRR7045-331M qualifies as a direct substitute with identical inductance, shielding, core type, and DC resistance, while offering increased current capacity (600 mA vs. 400 mA). The P1167.334NLT maintains the 330 µH inductance and shielded construction but operates at lower current (350 mA) with higher DC resistance (1.47 Ohm), requiring application-specific evaluation.

Parameter Comparison

Engineering Selection Recommendations

SRR7045-331M Selection Criteria: The SRR7045-331M is the preferred substitute when the application permits higher current capacity. Both parts share identical inductance, DC resistance, core construction, and self-resonant frequency characteristics. The SRR7045-331M provides 600 mA current rating compared to the PM74SH-331M-RC's 400 mA, with marginally higher saturation current (270 mA vs. 250 mA). Both parts maintain ROHS3 compliance, MSL 1 rating, and identical operating temperature minimums. Footprint compatibility is confirmed with matching 7.00 mm x 7.00 mm dimensions and 4.80 mm seated height. This substitute is suitable for applications where current headroom is beneficial or where supply chain availability of the SRR7045-331M is advantageous.

P1167.334NLT Selection Criteria: The P1167.334NLT maintains the 330 µH inductance and shielded construction required for electromagnetic compatibility. However, this part operates at reduced current capacity (350 mA vs. 400 mA) and exhibits significantly higher DC resistance (1.47 Ohm vs. 730 mOhm). The P1167.334NLT is suitable only for applications where the 350 mA current rating is sufficient and where the increased power dissipation from higher DC resistance is acceptable. The slightly larger footprint (7.54 mm x 7.54 mm) and lower self-resonant frequency (3 MHz vs. 4 MHz) must be evaluated against circuit layout and frequency response requirements. ROHS3 compliance and MSL 1 rating are maintained. This substitute is appropriate when the PM74SH-331M-RC and SRR7045-331M are unavailable and application parameters permit the noted deviations.

Frequently Asked Questions (FAQ)

Q: Can the SRR7045-331M be used as a direct replacement for the PM74SH-331M-RC?

A: Yes. Both parts share identical inductance (330 µH), DC resistance (730 mOhm Max), core type (drum core wirewound ferrite), shielding, self-resonant frequency (4 MHz), and physical dimensions (7.00 mm x 7.00 mm x 4.80 mm). The SRR7045-331M provides higher current capacity (600 mA vs. 400 mA), making it suitable for applications operating at or below 400 mA. Compliance certifications (ROHS3, MSL 1, REACH Unaffected) are identical.

Q: What are the limitations of using the P1167.334NLT as a substitute?

A: The P1167.334NLT has three primary limitations: (1) reduced current rating of 350 mA, which is below the PM74SH-331M-RC's 400 mA specification; (2) significantly higher DC resistance of 1.47 Ohm compared to 730 mOhm, resulting in increased power dissipation and heat generation; (3) lower self-resonant frequency of 3 MHz versus 4 MHz, which may affect performance in higher frequency applications. The footprint is also slightly larger (7.54 mm x 7.54 mm). This substitute is only appropriate when application current requirements do not exceed 350 mA and increased DC resistance is acceptable.

Q: Are all three parts compatible with the same PCB footprint?

A: The PM74SH-331M-RC and SRR7045-331M share identical dimensions (7.00 mm x 7.00 mm x 4.80 mm) and are footprint-compatible. The P1167.334NLT has a slightly larger footprint (7.54 mm x 7.54 mm x 4.50 mm) and may require PCB layout verification to confirm clearance and placement compatibility.

Q: Do all substitute parts meet the same environmental and compliance standards?

A: Yes. All three parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity ratings, and are REACH Unaffected. Operating temperature ranges are -40°C to 125°C for the PM74SH-331M-RC and SRR7045-331M, and -40°C to 130°C for the P1167.334NLT, providing equivalent or superior thermal performance.

Q: What is the primary difference between the PM74SH-331M-RC and SRR7045-331M?

A: The primary difference is current rating: the SRR7045-331M is rated for 600 mA versus the PM74SH-331M-RC's 400 mA. All other electrical and mechanical specifications are identical, including inductance, DC resistance, core construction, and physical dimensions.

Q: When should the P1167.334NLT be selected over the other options?

A: The P1167.334NLT should be selected only when the PM74SH-331M-RC and SRR7045-331M are unavailable and the application meets all of the following conditions: (1) operating current does not exceed 350 mA; (2) increased power dissipation from 1.47 Ohm DC resistance is acceptable; (3) circuit operation at frequencies below 3 MHz is required or acceptable; (4) PCB layout accommodates the slightly larger 7.54 mm x 7.54 mm footprint.