PM74SH-100M Equivalent & Substitute Parts

Part Overview

The PM74SH-100M is a 10 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.65 A with a maximum DC resistance of 70 mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across the industrial temperature range of -40°C to 125°C and is suitable for surface mount applications in nonstandard packaging.

Key Parameters

Parameter	PM74SH-100M
Inductance	10 µH
Inductance Tolerance	±20%
Current Rating	1.65 A
DC Resistance (DCR)	70 mOhm Max
Core Type	Ferrite Drum Core
Shielding	Shielded
Operating Temperature	-40°C to 125°C
Mounting Type	Surface Mount
Frequency - Self Resonant	25 MHz
Inductance Frequency - Test	100 kHz
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PM74SH-100M is determined by the following critical parameters:

Inductance Value: Must be 10 µH with ±20% tolerance
Inductance Test Frequency: 100 kHz or 1 kHz (both acceptable for this application)
Core Material & Type: Ferrite drum core or equivalent wirewound construction
Shielding: Shielded configuration required
Operating Temperature Range: Minimum -40°C to 125°C coverage
Mounting Type: Surface mount only
Current Rating: Must meet or exceed 1.65 A minimum requirement
DC Resistance: Lower DCR values are acceptable (improved performance)

All substitute parts listed maintain the 10 µH inductance specification, ferrite core construction, shielded configuration, and surface mount capability. Substitute parts with higher current ratings and lower DC resistance provide improved thermal performance and reduced losses compared to the obsolete PM74SH-100M.

Parameter Comparison

Parameter	PM74SH-100M	SRR7045-100M	SRR0908-100ML	P1167.103NLT	P1167.103NL
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Pulse Electronics	Pulse Electronics
Inductance	10 µH	10 µH	10 µH	10 µH	10 µH
Inductance Tolerance	±20%	±20%	±20%	±20%	±20%
Current Rating (Amps)	1.65 A	2.7 A	3 A	2 A	2 A
DC Resistance (DCR)	70 mOhm Max	42 mOhm Max	40 mOhm Max	50 mOhm Max	50 mOhm Max
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Drum Core	Wirewound	Wirewound
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 130°C	-40°C to 130°C
Frequency - Self Resonant	25 MHz	25 MHz	11 MHz	26 MHz	26 MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SRR7045-100M (Bourns Inc.)

The SRR7045-100M is the direct equivalent substitute for the PM74SH-100M. Both are Bourns ferrite drum core inductors with identical inductance (10 µH), tolerance (±20%), operating temperature range (-40°C to 125°C), and self-resonant frequency (25 MHz). The SRR7045-100M offers superior electrical performance with 2.7 A current rating and 42 mOhm maximum DCR compared to the obsolete part's 1.65 A and 70 mOhm specifications. The SRR7045-100M is ROHS3 compliant and currently in active production with 7692 units in stock.

Secondary Recommendation: SRR0908-100ML (Bourns Inc.)

The SRR0908-100ML provides the highest current rating (3 A) and lowest DC resistance (40 mOhm) among available substitutes, delivering optimal thermal performance. This part maintains the 10 µH inductance and ferrite core construction. The self-resonant frequency is 11 MHz, which is lower than the PM74SH-100M. The SRR0908-100ML uses 8-SMD gull wing packaging, which differs from the nonstandard packaging of the original part and may require PCB layout modification. ROHS3 compliant and active production status.

Alternative Recommendation: P1167.103NLT or P1167.103NL (Pulse Electronics)

The P1167 series inductors from Pulse Electronics provide cross-manufacturer substitution with identical 10 µH inductance and ±20% tolerance. Both variants offer 2 A current rating and 50 mOhm maximum DCR. The P1167.103NLT is supplied in Tape & Reel packaging, while P1167.103NL is supplied in Tray packaging. Both are ROHS3 compliant with extended operating temperature to 130°C and higher self-resonant frequency (26 MHz). These parts are suitable when multi-source procurement is required.

Compliance Consideration:

The PM74SH-100M is RoHS non-compliant. All substitute parts (SRR7045-100M, SRR0908-100ML, P1167.103NLT, P1167.103NL) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can the SRR7045-100M directly replace the PM74SH-100M without circuit modification?

A: Yes. Both parts share identical inductance (10 µH), tolerance (±20%), operating temperature range (-40°C to 125°C), and self-resonant frequency (25 MHz). The SRR7045-100M has higher current rating and lower DC resistance, making it a direct functional upgrade. Mechanical footprint differences are minimal (7.00mm x 7.00mm vs. 7.80mm x 7.00mm), though PCB layout verification is recommended.

Q: What is the difference between the SRR7045-100M and SRR0908-100ML?

A: Both are Bourns ferrite drum core inductors with 10 µH inductance. The SRR0908-100ML offers higher current capacity (3 A vs. 2.7 A) and lower DC resistance (40 mOhm vs. 42 mOhm). However, the SRR0908-100ML has a lower self-resonant frequency (11 MHz vs. 25 MHz) and uses 8-SMD gull wing packaging instead of nonstandard packaging, requiring PCB layout changes.

Q: Why are the Pulse Electronics P1167 parts listed as alternatives?

A: The P1167.103NLT and P1167.103NL provide cross-manufacturer substitution with identical inductance and tolerance specifications. They are suitable when design requirements allow multi-source procurement or when Bourns parts are unavailable. Both are ROHS3 compliant with extended temperature range to 130°C.

Q: What is the significance of the packaging differences?

A: The PM74SH-100M uses nonstandard packaging. The SRR7045-100M also uses nonstandard packaging and is the closest mechanical match. The SRR0908-100ML uses 8-SMD gull wing packaging with larger dimensions (10.00mm x 9.50mm x 7.80mm), which may require PCB redesign. The P1167 series uses nonstandard packaging similar to the original part.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (SRR7045-100M, SRR0908-100ML, P1167.103NLT, P1167.103NL) are ROHS3 compliant. The original PM74SH-100M is RoHS non-compliant, making substitution necessary for new designs subject to RoHS regulations.

Q: What is the impact of DC resistance differences on circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. The SRR0908-100ML (40 mOhm) and SRR7045-100M (42 mOhm) dissipate less power than the PM74SH-100M (70 mOhm). In high-current applications, this translates to improved thermal stability and extended component life. The P1167 series (50 mOhm) provides intermediate performance.

Q: Can the SRR0908-100ML be used in space-constrained applications?

A: The SRR0908-100ML has larger dimensions (10.00mm x 9.50mm x 7.80mm) compared to the PM74SH-100M (7.80mm x 7.00mm x 4.90mm). It is not suitable for space-constrained designs without PCB layout modification. The SRR7045-100M or P1167 series are better choices for compact applications.

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