RL110-101K Equivalent & Substitute Parts

Part Overview

The RL110-101K is a 100 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.7 A with a maximum DC resistance of 160 mOhm. This through-hole component features a radial, vertical cylinder configuration with 4 leads and operates across a temperature range of -30°C to 100°C. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Inductance	100 µH
Tolerance	±10%
Current Rating	1.7 A
DC Resistance (Max)	160 mOhm
Core Type	Ferrite, Unshielded
Mounting Type	Through Hole
Package / Case	Radial, Vertical Cylinder, 4 Leads (Open)
Frequency - Self Resonant	5.7 MHz
Operating Temperature Range	-30°C ~ 100°C
Size / Dimension	0.394" Dia (10.00 mm)

Substitute Part Grouping Explanation

Substitution of the RL110-101K is determined by strict equivalence across the following electrical and mechanical parameters:

Inductance value: 100 µH at 1 kHz test frequency
Inductance tolerance: ±10%
Current rating: 1.7 A minimum
DC resistance: 160 mOhm maximum
Core material and shielding: Ferrite, unshielded
Package configuration: Radial, vertical cylinder, 4 leads (open)
Mounting type: Through hole
Self-resonant frequency: 5.7 MHz
Physical dimensions: 0.394" diameter (10.00 mm)

The RCH110NP-101K from Sumida America Components Inc. meets all specified electrical parameters and maintains mechanical compatibility with the original RL110-101K design.

Parameter Comparison

Parameter	RL110-101K (Bourns)	RCH110NP-101K (Sumida)	Match Status
Inductance	100 µH	100 µH	Equivalent
Tolerance	±10%	±10%	Equivalent
Current Rating (Amps)	1.7 A	1.7 A	Equivalent
DC Resistance (Max)	160 mOhm	160 mOhm	Equivalent
Core Type	Ferrite, Unshielded	Ferrite, Unshielded	Equivalent
Frequency - Self Resonant	5.7 MHz	5.7 MHz	Equivalent
Operating Temperature Range	-30°C ~ 100°C	-40°C ~ 100°C	Substitute Exceeds
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Radial, Vertical Cylinder, 4 Leads (Open)	Radial, Vertical Cylinder, 4 Leads (Open)	Equivalent
Size / Dimension	0.394" Dia (10.00 mm)	0.394" Dia (10.00 mm)	Equivalent
Height - Seated (Max)	0.394" (10.00 mm)	0.413" (10.50 mm)	Substitute Within Tolerance
Inductance Frequency - Test	1 kHz	1 kHz	Equivalent
Product Status	Obsolete	Active	Substitute Available
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

The RCH110NP-101K is a direct electrical and mechanical equivalent to the RL110-101K. Selection between these parts should be based on the following factors:

Product Availability: The RL110-101K is obsolete. The RCH110NP-101K is active and currently in production, ensuring long-term supply chain continuity.

Compliance Status: The RCH110NP-101K is ROHS3 compliant, whereas the RL110-101K is non-compliant. For applications subject to RoHS regulations, the Sumida part is the required choice.

Operating Temperature: The RCH110NP-101K extends the lower operating temperature limit to -40°C, compared to -30°C for the original part. This provides additional thermal margin for applications operating in cold environments.

Physical Dimensions: The RCH110NP-101K height is 0.413" (10.50 mm) versus 0.394" (10.00 mm) for the RL110-101K. This 0.019" difference must be verified against PCB layout constraints and enclosure clearances.

Packaging: The RCH110NP-101K is supplied in bulk packaging, whereas the original part packaging is unspecified. Confirm packaging requirements for your procurement process.

Frequently Asked Questions (FAQ)

Q: Can the RCH110NP-101K replace the RL110-101K in existing designs?

A: Yes. Both parts are electrically equivalent at 100 µH ±10%, 1.7 A, and 160 mOhm maximum DC resistance. Both use ferrite unshielded drum core construction with identical self-resonant frequency (5.7 MHz) and through-hole radial mounting. Mechanical compatibility is confirmed for standard PCB layouts. Verify the 0.019" height difference (10.50 mm vs. 10.00 mm) against your specific board design and enclosure clearances.

Q: What is the inductance tolerance, and does it affect substitution?

A: Both parts are specified at ±10% tolerance at 1 kHz test frequency. This tolerance applies equally to both the original and substitute part, ensuring equivalent performance in circuit applications where inductance variation within this range is acceptable.

Q: Are there any compliance differences between these parts?

A: Yes. The RCH110NP-101K is ROHS3 compliant, while the RL110-101K is RoHS non-compliant. For applications or markets requiring RoHS compliance, the Sumida part is mandatory. The original Bourns part cannot be used in RoHS-regulated applications.

Q: What is the significance of the extended temperature range on the RCH110NP-101K?

A: The RCH110NP-101K operates from -40°C to 100°C, compared to -30°C to 100°C for the RL110-101K. This extended lower temperature limit provides additional operational margin for applications in cold environments or equipment with wide ambient temperature requirements.

Q: How do the physical dimensions compare, and does the height difference matter?

A: Both parts have a 0.394" (10.00 mm) diameter. The height difference is 0.019" (0.50 mm), with the RCH110NP-101K at 0.413" (10.50 mm) versus the RL110-101K at 0.394" (10.00 mm). This difference is negligible for most applications but must be verified against PCB layout, component spacing, and enclosure clearances in space-constrained designs.

Q: Is the RCH110NP-101K available in the same packaging as the original part?

A: The RCH110NP-101K is supplied in bulk packaging. Confirm your procurement requirements for tape-and-reel or alternative packaging options with your supplier.

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