UP0.4SC-681-R Equivalent & Substitute Parts

Part Overview

The UP0.4SC-681-R is a 680 µH shielded wirewound inductor manufactured by Eaton - Electronics Division, part of the UNI-PAC™ 0.4SC series. This surface mount component is rated for 180 mA continuous current with a maximum DC resistance of 2.2Ohm and operates across the temperature range of -40°C to 125°C. The component maintains Active product status with RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and environmental ratings can be maintained across alternative manufacturers while preserving the core functional specifications required for the application circuit.

Key Parameters

Parameter	Value	Unit
Inductance	680	µH
Inductance Tolerance	±20	%
Current Rating	180	mA
DC Resistance (Max)	2.2	Ohm
Shielding	Shielded	—
Q Factor @ 100kHz	40	—
Self Resonant Frequency	3	MHz
Operating Temperature Range	-40 to 125	°C
Mounting Type	Surface Mount	—
Package Type	Nonstandard	—
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the UP0.4SC-681-R is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Inductance value: 680 µH at ±20% tolerance
Current rating: 180 mA minimum
DC resistance: 2.2Ohm maximum
Q factor: 40 @ 100kHz
Self resonant frequency: 3MHz
Shielding: Shielded configuration required

Mechanical Compatibility Requirements:

Mounting type: Surface Mount
Package classification: Nonstandard
Physical dimensions: Compatible with 0.260" L x 0.175" W footprint (±0.010" tolerance acceptable)
Height seated: 0.115" maximum

Environmental & Compliance Requirements:

Operating temperature range: -40°C to 125°C minimum
RoHS compliance status: Active
Moisture sensitivity: MSL 1 (Unlimited)
Packaging format: Tape & Reel (TR)

The SRR6603-681ML from Bourns Inc. meets all substitution criteria across these parameters.

Parameter Comparison

Parameter	UP0.4SC-681-R (Eaton)	SRR6603-681ML (Bourns)	Match Status
Inductance	680 µH	680 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	180 mA	180 mA	Equivalent
DC Resistance (Max)	2.2 Ohm	2.2 Ohm	Equivalent
Shielding	Shielded	Shielded	Equivalent
Q @ 100kHz	40	40	Equivalent
Self Resonant Frequency	3 MHz	3 MHz	Equivalent
Operating Temperature Range	-40°C to 125°C	-55°C to 125°C	Bourns exceeds minimum
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Type	Nonstandard	Nonstandard	Equivalent
Length	0.260" (6.60mm)	0.260" (6.60mm)	Equivalent
Width	0.175" (4.45mm)	0.173" (4.40mm)	Within tolerance
Height (Max)	0.115" (2.92mm)	0.118" (3.00mm)	Within tolerance
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	Equivalent
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Equivalent

Engineering Selection Recommendations

Primary Part: UP0.4SC-681-R

The UP0.4SC-681-R maintains Active product status with confirmed inventory availability (649 pcs). This component is RoHS Compliant and carries EAR99 export classification. Selection of the primary part is appropriate when Eaton supply chain continuity and existing qualification documentation are required.

Substitute Part: SRR6603-681ML

The SRR6603-681ML from Bourns Inc. is qualified as a direct substitute based on complete electrical and mechanical parameter equivalence. This component demonstrates:

Identical inductance, current rating, DC resistance, and frequency characteristics
Extended operating temperature range (-55°C to 125°C) providing additional thermal margin
ROHS3 Compliant status (exceeds RoHS Compliant requirement)
Higher inventory availability (1419 pcs)
Ferrite drum core construction with documented saturation current specification (55mA)
REACH Unaffected status providing additional regulatory clarity

Selection of the SRR6603-681ML is appropriate when supply availability, extended temperature performance, or regulatory documentation requirements favor the Bourns alternative.

Frequently Asked Questions (FAQ)

Q: Can the SRR6603-681ML be used as a direct replacement for the UP0.4SC-681-R in existing designs?

A: Yes. The SRR6603-681ML meets all electrical specifications (680 µH ±20%, 180 mA, 2.2Ohm DCR, 40 Q @ 100kHz, 3MHz SRF) and mechanical dimensions (0.260" x 0.173" x 0.118" max height) required for direct substitution. Physical dimensions are within acceptable tolerance for PCB footprint compatibility.

Q: What are the differences between these two inductors?

A: The primary differences are manufacturer (Eaton vs. Bourns), core material specification (Eaton core material not specified vs. Bourns ferrite drum core), operating temperature range (Eaton -40°C to 125°C vs. Bourns -55°C to 125°C), and saturation current documentation (Bourns specifies 55mA saturation current). All critical electrical parameters are identical.

Q: Are both parts available in the same packaging format?

A: Yes. Both UP0.4SC-681-R and SRR6603-681ML are supplied in Tape & Reel (TR) packaging format suitable for automated assembly processes.

Q: Which part should be selected for new designs?

A: Selection depends on supply chain strategy and environmental requirements. The SRR6603-681ML offers extended temperature range (-55°C minimum vs. -40°C) and higher documented inventory. The UP0.4SC-681-R may be preferred if existing Eaton qualification or supply agreements are in place.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts are RoHS compliant. The SRR6603-681ML carries ROHS3 Compliant status and REACH Unaffected designation, providing additional regulatory documentation. Both carry EAR99 export classification and identical HTSUS codes (8504.50.4000).

Q: What is the moisture sensitivity rating for both parts?

A: Both components carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no moisture precautions are required during storage, handling, or assembly.

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