RL187-103J-RC Equivalent & Substitute Parts

Part Overview

The RL187-103J-RC is a 10 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 40 mA maximum current with 40 Ohm maximum DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 105°C and is ROHS3 compliant.

Substiute Parts

RL187-103J-RC

Bourns Inc.In Stock: 948RL187-103J-RC Datasheet

Current PartRFQ

AIUR-04-103J

Abracon LLCIn Stock: 2165AIUR-04-103J Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RL187-103J-RC is determined by strict equivalence across the following critical parameters:

• Inductance value: 10 mH with ±5% tolerance
• Current rating: 40 mA minimum
• DC resistance: 40 Ohm maximum
• Core type: Ferrite, unshielded drum core
• Mounting configuration: Through hole, radial vertical cylinder
• Self-resonant frequency: 400 kHz
• Test frequency: 79.6 kHz

The AIUR-04-103J from Abracon LLC meets all these core electrical and mechanical specifications, qualifying it as a direct substitute for the obsolete RL187-103J-RC.

Parameter Comparison

Engineering Selection Recommendations

The AIUR-04-103J is the qualified substitute for the RL187-103J-RC based on electrical and mechanical parameter equivalence. The substitute part is currently in active production status with 2056 units available in inventory, compared to the obsolete status of the original part with 874 units remaining.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection. The substitute part is supplied in bulk packaging and carries a Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Physical dimensions show minor variation: the AIUR-04-103J has a slightly larger diameter of 0.335" (8.50 mm) compared to 0.315" (8.00 mm) for the original part, while height remains identical at 0.441" (11.20 mm). This dimensional difference must be evaluated within the context of the specific PCB layout and mechanical clearance requirements of the application.

Frequently Asked Questions (FAQ)

Q: Can the AIUR-04-103J be used as a direct replacement for the RL187-103J-RC?

A: Yes. Both parts share identical electrical specifications: 10 mH inductance at ±5% tolerance, 40 mA current rating, 40 Ohm maximum DC resistance, ferrite unshielded core, and 400 kHz self-resonant frequency. Both are through-hole mounted in radial vertical cylinder configuration and tested at 79.6 kHz.

Q: What is the difference in operating temperature range?

A: The RL187-103J-RC operates from -55°C to 105°C, while the AIUR-04-103J operates from -25°C to 85°C. Applications requiring operation below -25°C or above 85°C must use the original Bourns part or identify alternative solutions.

Q: Are there physical dimension differences?

A: The AIUR-04-103J has a diameter of 0.335" (8.50 mm) compared to 0.315" (8.00 mm) for the RL187-103J-RC. Height is identical at 0.441" (11.20 mm). PCB layout and mechanical clearance must accommodate the larger diameter.

Q: What is the difference in Q factor?

A: The RL187-103J-RC specifies Q @ 79.6 kHz of 100, while the AIUR-04-103J specifies Q @ 79.6 kHz of 40. This difference in quality factor may affect circuit performance in applications sensitive to inductor losses.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the RL187-103J-RC and AIUR-04-103J are ROHS3 compliant and REACH unaffected.

Q: What is the inventory status?

A: The RL187-103J-RC (obsolete) has 874 units available. The AIUR-04-103J (active production) has 2056 units available, providing greater supply security for ongoing production requirements.