70F337AP-RC Equivalent & Substitute Parts

Part Overview

The 70F337AP-RC is a 330 nH unshielded wirewound inductor manufactured by Bourns Inc., rated for 1.69 A with a maximum DC resistance of 700mOhm. This component features a phenolic core and axial through-hole mounting in a 0.120" diameter by 0.310" length package. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design requirements and production continuity.

Substiute Parts

70F337AP-RC

Bourns Inc.In Stock: 78470F337AP-RC Datasheet

Current PartRFQ

1537R-04M

API Delevan Inc.In Stock: 9611537R-04M Datasheet

SimilarRFQ

B78108E1331M000

EPCOS - TDK ElectronicsIn Stock: 6027B78108E1331M000 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 70F337AP-RC is determined by the following critical parameters: inductance value (330 nH), tolerance (±20%), operating temperature range (-55°C ~ 125°C), mounting type (through hole axial), and shielding configuration (unshielded). The current rating and DC resistance are secondary selection criteria that influence performance in specific circuit applications.

Two substitute parts meet these core requirements:

1537R-04M (API Delevan Inc.) matches the primary electrical specifications with identical inductance, tolerance, and temperature range. This molded inductor variant provides lower DC resistance (90mOhm vs. 700mOhm) and slightly reduced current rating (1.58 A vs. 1.69 A).

B78108E1331M000 (EPCOS - TDK Electronics) also maintains the 330 nH inductance and ±20% tolerance within the same temperature range. This drum core wirewound inductor offers significantly higher current capacity (5.3 A) and substantially lower DC resistance (23mOhm), with ferrite core construction and higher saturation current (10.1 A).

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with ROHS3 compliance, providing long-term availability and regulatory alignment compared to the obsolete 70F337AP-RC.

1537R-04M is suitable for applications where the original current rating of 1.69 A is adequate and DC resistance characteristics are not critical. The molded construction and lower DC resistance offer improved thermal performance in moderate-current applications. This part is available in Tape & Reel packaging.

B78108E1331M000 is appropriate for applications requiring higher current capacity or lower DC resistance performance. The ferrite drum core construction and 5.3 A rating provide significant performance headroom. This part is available in Cut Tape packaging and carries MSL 1 (Unlimited) moisture sensitivity rating. The REACH Affected status requires verification against specific supply chain requirements.

Selection between these substitutes depends on circuit current requirements, thermal constraints, and packaging format needs for production processes.

Frequently Asked Questions (FAQ)

Q: Can 1537R-04M directly replace 70F337AP-RC in all applications?

A: 1537R-04M maintains identical inductance (330 nH), tolerance (±20%), and operating temperature range. The current rating is 1.58 A versus 1.69 A, and DC resistance is 90mOhm versus 700mOhm. Direct substitution is valid for circuits operating at or below 1.58 A where the lower DC resistance does not create unintended circuit behavior changes.

Q: What are the advantages of B78108E1331M000 over the original part?

A: B78108E1331M000 provides 5.3 A current capacity (versus 1.69 A), 23mOhm DC resistance (versus 700mOhm), and ferrite core construction. These characteristics reduce power dissipation and thermal stress in higher-current applications. The higher saturation current (10.1 A) provides additional design margin.

Q: Are there packaging differences between these parts?

A: 70F337AP-RC uses standard through-hole axial packaging (0.120" Dia x 0.310" L). 1537R-04M is slightly larger (0.156" Dia x 0.375" L) and supplied in Tape & Reel format. B78108E1331M000 is comparable in size (0.157" Dia x 0.374" L) and supplied in Cut Tape format. Physical dimensions must be verified against PCB layout constraints.

Q: Do all three parts meet the same compliance standards?

A: All three parts are ROHS3 compliant and carry EAR99 ECCN classification. B78108E1331M000 is REACH Affected, while 70F337AP-RC and 1537R-04M are REACH Unaffected. Supply chain and regulatory requirements must be evaluated based on end-use geography and customer specifications.

Q: What is the impact of different core materials on circuit performance?

A: 70F337AP-RC and 1537R-04M use phenolic cores, while B78108E1331M000 uses ferrite. Ferrite cores typically provide better high-frequency performance and lower DC resistance. The choice depends on circuit frequency requirements and thermal management needs.