Hammond Manufacturing 1535L Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 1535L is a 50 mH unshielded wirewound inductor rated for 65 mA maximum current with a DC resistance of 127 mOhm maximum. This through-hole axial component is designed for general-purpose filtering and energy storage applications in electronic circuits. The 1535L series is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

1535L

Hammond ManufacturingIn Stock: 9441535L Datasheet

Current PartRFQ

70F502AF-RC

Bourns Inc.In Stock: 106270F502AF-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1535L is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 50 mH ±5% tolerance
• Mounting configuration: Through-hole axial package
• Shielding type: Unshielded construction

Secondary Compatibility Factors:

• Current rating must equal or exceed 65 mA
• DC resistance must not exceed 127 mOhm to maintain circuit performance
• Self-resonant frequency and Q factor should support the intended operating frequency range

The Bourns 70F502AF-RC meets the primary inductance and package requirements. However, the substitute exhibits reduced current rating (37 mA versus 65 mA) and increased DC resistance (175 Ohm versus 127 mOhm), indicating application-dependent compatibility.

Parameter Comparison

Engineering Selection Recommendations

Hammond 1535L (Obsolete): The 1535L is no longer in active production. Designs currently using this component require alternative sourcing or redesign.

Bourns 70F502AF-RC (Active Status): The 70F502AF-RC is an active product with documented availability. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Application-Specific Considerations: Selection between these components depends on circuit current requirements. The 1535L supports continuous operation at 65 mA, while the 70F502AF-RC is limited to 37 mA. The 70F502AF-RC exhibits higher DC resistance (175 Ohm versus 127 mOhm), which will increase power dissipation in the inductor. The lower Q factor and self-resonant frequency of the 70F502AF-RC may affect performance in high-frequency filtering applications.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 70F502AF-RC directly replace the Hammond 1535L?

A: Direct replacement is possible only if circuit current does not exceed 37 mA. The increased DC resistance of the substitute will result in higher power dissipation. Verify that the application can tolerate these parameter differences before implementation.

Q: What is the impact of the higher DC resistance in the 70F502AF-RC?

A: The 70F502AF-RC exhibits 175 Ohm maximum DC resistance compared to 127 mOhm in the 1535L. This 1.38-fold increase will generate additional heat during operation. Calculate power dissipation using I²R to confirm thermal compatibility with your circuit design.

Q: Are both components suitable for the same frequency range?

A: The 1535L has a self-resonant frequency of 330 kHz, while the 70F502AF-RC is rated at 196 kHz. Applications operating near or above 196 kHz may experience performance degradation with the substitute. The lower Q factor of the 70F502AF-RC (57 versus 113 at 79 kHz) indicates reduced efficiency in the test frequency range.

Q: Do both components meet current compliance standards?

A: Yes. Both the Hammond 1535L and Bourns 70F502AF-RC are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What are the physical size differences?

A: The Hammond 1535L measures 0.625" diameter × 0.875" length (15.88 mm × 22.22 mm). The Bourns 70F502AF-RC measures 0.400" diameter × 0.630" length (10.16 mm × 16.00 mm). The substitute is physically smaller and may affect PCB layout considerations.