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PM74SH-3R9M-RC Equivalent & Substitute Parts
Part Overview
The PM74SH-3R9M-RC is a 3.9 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2.7 A continuous current with a maximum DC resistance of 28 mOhm. This component is designed for surface mount applications requiring controlled inductance values in compact nonstandard packages. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).
Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter tolerances for this inductor category, ensuring functional compatibility in target applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Inductance | 3.9 | µH |
| Inductance Tolerance | ±20% | - |
| Current Rating | 2.7 | A |
| DC Resistance (Max) | 28 | mOhm |
| Saturation Current | 2.4 | A |
| Shielding | Shielded | - |
| Operating Temperature Range | -40°C to 125°C | - |
| Mounting Type | Surface Mount | - |
| Package Type | Nonstandard | - |
| RoHS Status | ROHS3 Compliant | - |
Substitute Part Grouping Explanation
Substitute parts for the PM74SH-3R9M-RC are qualified based on the following electrical and mechanical criteria:
Primary Substitution Criteria:
- Inductance value within ±20% tolerance band (3.12 µH to 4.68 µH acceptable range)
- Current rating equal to or greater than 2.7 A
- DC resistance at or below 28 mOhm maximum
- Shielded construction to maintain electromagnetic isolation
- Surface mount nonstandard package configuration
- Operating temperature range covering -40°C to 125°C minimum
- RoHS3 compliance and MSL 1 rating
The P1167.362NL from Pulse Electronics qualifies as a substitute based on inductance proximity (3.6 µH falls within the tolerance band), superior current rating (3.1 A exceeds 2.7 A requirement), lower DC resistance (20 mOhm improves performance), shielded construction, and equivalent environmental compliance.
Parameter Comparison
| Parameter | PM74SH-3R9M-RC (Bourns) | P1167.362NL (Pulse Electronics) | Compatibility |
|---|---|---|---|
| Inductance | 3.9 µH | 3.6 µH | Within tolerance band |
| Inductance Tolerance | ±20% | ±30% | Acceptable variance |
| Current Rating | 2.7 A | 3.1 A | Substitute exceeds requirement |
| Saturation Current | 2.4 A | 3.1 A | Substitute provides margin |
| DC Resistance (Max) | 28 mOhm | 20 mOhm | Substitute improves performance |
| Shielding | Shielded | Shielded | Equivalent |
| Operating Temperature | -40°C to 125°C | -40°C to 130°C | Substitute extends range |
| Frequency - Self Resonant | 40 MHz | 40 MHz | Equivalent |
| Inductance Test Frequency | 100 kHz | 100 kHz | Equivalent |
| Mounting Type | Surface Mount | Surface Mount | Equivalent |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Equivalent |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | Equivalent |
Engineering Selection Recommendations
Both the PM74SH-3R9M-RC and P1167.362NL maintain active product status with full RoHS3 compliance and REACH unaffected designation. Selection between these parts should be based on:
PM74SH-3R9M-RC (Primary): Use when exact inductance specification of 3.9 µH is critical to circuit performance and tighter tolerance control is required.
P1167.362NL (Substitute): Use when supply constraints exist for the primary part. The substitute provides improved electrical performance through lower DC resistance (20 mOhm vs. 28 mOhm) and higher current rating (3.1 A vs. 2.7 A), with inductance value within acceptable tolerance band. Extended operating temperature range (-40°C to 130°C) provides additional thermal margin.
Both parts carry equivalent environmental certifications and moisture sensitivity ratings, ensuring compliance with manufacturing and field deployment requirements.
Frequently Asked Questions (FAQ)
Q: Can P1167.362NL be used as a direct replacement for PM74SH-3R9M-RC?
A: Yes, within the electrical parameter tolerances defined for this inductor category. The 3.6 µH inductance of the substitute falls within the ±20% tolerance band of the 3.9 µH primary part, and the substitute exceeds current and saturation ratings while reducing DC resistance.
Q: What is the inductance tolerance band for substitution?
A: The PM74SH-3R9M-RC has ±20% tolerance, establishing an acceptable range of 3.12 µH to 4.68 µH. The P1167.362NL at 3.6 µH operates within this band.
Q: Are there package dimension differences between these parts?
A: Yes. PM74SH-3R9M-RC measures 7.00mm × 7.00mm × 4.80mm (height seated max). P1167.362NL measures 7.54mm × 7.54mm × 4.50mm. Both are nonstandard surface mount packages. Verify PCB layout compatibility before substitution.
Q: Do both parts meet the same compliance standards?
A: Yes. Both parts are ROHS3 compliant, REACH unaffected, carry MSL 1 (unlimited) moisture sensitivity rating, and operate across -40°C to 125°C minimum (P1167.362NL extends to 130°C).
Q: What is the DC resistance impact of substitution?
A: The P1167.362NL substitute has 20 mOhm maximum DC resistance compared to 28 mOhm for the primary part. This 28.6% reduction in resistance improves power efficiency and reduces heat generation in the inductor.
Q: Are there frequency response differences?
A: Both parts share identical self-resonant frequency (40 MHz) and inductance test frequency (100 kHz), ensuring equivalent high-frequency behavior.
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