PM74SH-680M-RC Equivalent & Substitute Parts

Part Overview

The PM74SH-680M-RC is a 68 µH shielded drum core wirewound inductor manufactured by Bourns Inc., designed for surface mount applications. This component features a 770 mA current rating, 210 mOhm maximum DC resistance, and operates across the -40°C to 125°C temperature range. The part maintains Active product status and is RoHS3 compliant. Substitute parts are identified based on matching inductance value, shielding type, core material, and compatible electrical performance parameters within acceptable tolerance ranges.

Substiute Parts

PM74SH-680M-RC

Bourns Inc.In Stock: 1042PM74SH-680M-RC Datasheet

Current PartRFQ

SRR0908-680ML

Bourns Inc.In Stock: 3210SRR0908-680ML Datasheet

SimilarRFQ

SRR7045-680M

Bourns Inc.In Stock: 17270SRR7045-680M Datasheet

SimilarRFQ

P1167.683NLT

Pulse ElectronicsIn Stock: 12167P1167.683NLT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM74SH-680M-RC are qualified based on the following critical parameters:

• Inductance value: 68 µH (matching specification)
• Inductance tolerance: ±20% (matching specification)
• Shielding: Shielded construction required
• Core material: Ferrite or equivalent shielded construction
• Current rating: Equal to or greater than 770 mA
• DC resistance: Maximum 210 mOhm or lower
• Operating temperature range: Minimum -40°C to 125°C coverage
• Surface mount configuration
• RoHS3 compliance and REACH unaffected status

The three identified substitutes meet these criteria with variations in current handling capacity, package dimensions, and DC resistance characteristics.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain Active product status and full RoHS3 compliance with REACH unaffected designation, ensuring regulatory alignment with the original PM74SH-680M-RC.

SRR7045-680M provides direct dimensional and electrical equivalence with identical footprint (7.00 × 7.00 × 4.80 mm), matching DC resistance (210 mOhm max), and identical self-resonant frequency (10 MHz). Current rating increases to 1.2 A with saturation current of 750 mA, providing enhanced headroom for the 770 mA application requirement.

SRR0908-680ML offers the lowest DC resistance (184 mOhm max) and highest current capacity (1.25 A with 1.9 A saturation), but requires accommodation of larger package dimensions (10.00 × 9.50 × 7.80 mm) and different package configuration (8-SMD, Gull Wing). Self-resonant frequency reduces to 2.5 MHz.

P1167.683NLT from Pulse Electronics maintains similar footprint dimensions (7.54 × 7.54 × 4.50 mm) and current rating (780 mA), but exhibits higher DC resistance (310 mOhm max) and lower self-resonant frequency (8.8 MHz). Operating temperature extends to 130°C maximum.

Frequently Asked Questions (FAQ)

Q: Can SRR7045-680M directly replace PM74SH-680M-RC without PCB layout changes?

A: Yes. SRR7045-680M maintains identical footprint dimensions (7.00 × 7.00 mm) and height (4.80 mm), enabling direct substitution without PCB modification.

Q: What are the DC resistance implications when selecting a substitute?

A: DC resistance directly affects power dissipation and thermal performance. PM74SH-680M-RC and SRR7045-680M both specify 210 mOhm maximum. SRR0908-680ML provides lower resistance (184 mOhm), reducing losses. P1167.683NLT exhibits higher resistance (310 mOhm), increasing power dissipation by approximately 48% at rated current.

Q: Is the SRR0908-680ML package change compatible with existing designs?

A: SRR0908-680ML uses 8-SMD Gull Wing packaging with larger dimensions (10.00 × 9.50 × 7.80 mm) compared to the nonstandard 7.00 × 7.00 × 4.80 mm footprint of PM74SH-680M-RC. PCB layout redesign is required for this substitution.

Q: How do saturation current ratings affect circuit performance?

A: Saturation current indicates the threshold where inductance begins to degrade. PM74SH-680M-RC saturates at 600 mA. All substitutes provide equal or higher saturation ratings (750 mA to 1.9 A), ensuring stable inductance performance across the 770 mA operating range.

Q: Are all substitutes suitable for the full -40°C to 125°C operating range?

A: Yes. All substitutes support minimum -40°C to 125°C operation. P1167.683NLT extends to 130°C maximum, providing additional thermal margin.

Q: What is the significance of self-resonant frequency differences?

A: Self-resonant frequency defines the upper frequency limit where the inductor maintains inductive behavior. PM74SH-680M-RC and SRR7045-680M both specify 10 MHz. SRR0908-680ML reduces to 2.5 MHz, limiting high-frequency applications. P1167.683NLT specifies 8.8 MHz. Application frequency requirements must remain below these thresholds.