UP0.4C-680 Equivalent & Substitute Parts Reference

Part Overview

The UP0.4C-680 is a 68 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, part of the UNI-PAC™ 0.4C series. This component is rated for 450 mA continuous current with a maximum DC resistance of 1.1 Ohm and operates across the temperature range of -40°C to 85°C. The part is currently classified as obsolete, making identification of equivalent alternatives essential for ongoing design support and production continuity. Substitute components must maintain the 68 µH inductance specification, support the required current ratings, and fit within the nonstandard surface mount package dimensions of 0.260" L x 0.175" W (6.60mm x 4.45mm).

Key Parameters

Parameter	Value	Unit
Inductance	68	µH
Inductance Tolerance	±20%	-
Current Rating	450	mA
Current - Saturation (Isat)	430	mA
DC Resistance (DCR) Maximum	1.1	Ohm
Core Material	Ferrite	-
Shielding	Unshielded	-
Operating Temperature Range	-40°C to 85°C	-
Mounting Type	Surface Mount	-
Package Dimensions (L x W)	0.260" x 0.175" (6.60mm x 4.45mm)	-
Height - Seated (Max)	0.115" (2.92mm)	-
Inductance Test Frequency	100	kHz
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute components for the UP0.4C-680 are classified based on electrical parameter compatibility and product status. The primary substitution criterion is maintenance of the 68 µH inductance specification at the 100 kHz test frequency. Secondary criteria include current rating capacity, DC resistance characteristics, operating temperature range, and physical package dimensions.

Direct Substitutes maintain identical electrical specifications and are sourced from the same manufacturer (Eaton). These parts differ only in packaging format (bulk versus tape & reel) or product status (active versus obsolete).

Similar Substitutes are sourced from alternative manufacturers (Pulse Electronics, Bourns Inc.) and maintain the 68 µH inductance and unshielded wirewound construction. These parts exhibit variations in current rating (400-440 mA range), DC resistance (720 mOhm to 1.1 Ohm), inductance tolerance (±10% to ±20%), and operating temperature ranges (-40°C to 125°C or 130°C). Physical dimensions remain compatible within the nonstandard surface mount package class.

Key Parameters for Substitution Determination:

Inductance: 68 µH (fixed requirement)
Current Rating: Minimum 400 mA (all substitutes meet or exceed 450 mA requirement)
DC Resistance: Maximum 1.1 Ohm (substitutes range from 720 mOhm to 1.1 Ohm)
Core Type: Ferrite drum core or wirewound construction
Shielding: Unshielded
Mounting: Surface Mount
Package Dimensions: 0.260" L x 0.175" W (6.60mm x 4.45mm) footprint compatibility

Parameter Comparison

Parameter	UP0.4C-680 (Main)	UP0.4C-680-R	P0770.683NLT	SDR0603-680KL
Manufacturer	Eaton	Eaton	Pulse Electronics	Bourns Inc.
Product Status	Obsolete	Active	Active	Active
Inductance (µH)	68	68	68	68
Inductance Tolerance	±20%	±20%	±20%	±10%
Current Rating (mA)	450	450	400	440
Current - Saturation (mA)	430	430	400	540
DC Resistance (Ohm Max)	1.1	1.1	0.86	0.72
Core Material	Ferrite	Ferrite	Not specified	Ferrite
Type	Drum Core, Wirewound	Drum Core, Wirewound	Wirewound	Drum Core, Wirewound
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 130	-40 to 125
Inductance Test Frequency (kHz)	100	100	100	1
Package Dimensions (mm)	6.60 x 4.45	6.60 x 4.45	6.60 x 4.45	5.80 x 5.80
Height - Seated (mm Max)	2.92	2.92	2.92	3.90
RoHS Status	Non-compliant	Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

UP0.4C-680-R (Eaton - Electronics Division) is the primary direct substitute. This part maintains identical electrical specifications (68 µH, 450 mA, 1.1 Ohm DCR) and physical dimensions as the main part. The critical distinction is product status: UP0.4C-680-R is active and RoHS compliant, whereas the original UP0.4C-680 is obsolete and RoHS non-compliant. The packaging format differs (tape & reel versus bulk), which is suitable for automated assembly environments. This substitute is recommended for designs requiring direct electrical and mechanical compatibility with active product support.

SDR0603-680KL (Bourns Inc.) is suitable for applications where improved inductance tolerance (±10% versus ±20%) and lower DC resistance (720 mOhm versus 1.1 Ohm) provide performance benefits. This part supports a higher saturation current (540 mA versus 430 mA) and operates across an extended temperature range (-40°C to 125°C). Physical dimensions differ slightly (5.80mm x 5.80mm footprint, 3.90mm height), requiring PCB layout verification. RoHS3 compliance and active product status support long-term availability. The inductance test frequency differs (1 kHz versus 100 kHz), which may affect circuit behavior in high-frequency applications.

P0770.683NLT (Pulse Electronics) provides an alternative with lower DC resistance (860 mOhm) and extended operating temperature range (-40°C to 130°C). Current rating is reduced to 400 mA, which is acceptable only for applications with maximum current requirements below 400 mA. Physical dimensions and height remain compatible. ROHS3 compliance and active status ensure availability. This substitute is appropriate for thermal-demanding applications where the reduced current rating is not a limiting factor.

Selection should prioritize product status (active versus obsolete) and regulatory compliance (RoHS status) as primary criteria. Electrical parameter variations (current rating, DC resistance, tolerance) must be evaluated against specific circuit requirements. Physical dimension compatibility must be confirmed for PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can UP0.4C-680-R be used as a direct replacement for UP0.4C-680 in existing designs?

A: Yes. UP0.4C-680-R maintains identical electrical specifications (68 µH inductance, 450 mA current rating, 1.1 Ohm maximum DC resistance) and physical dimensions (6.60mm x 4.45mm footprint, 2.92mm seated height). The primary difference is packaging format (tape & reel versus bulk) and product status (active versus obsolete). No circuit modifications are required.

Q: What are the implications of the inductance tolerance difference between UP0.4C-680 (±20%) and SDR0603-680KL (±10%)?

A: The SDR0603-680KL provides tighter inductance tolerance, which reduces circuit parameter variation and improves performance consistency. For applications sensitive to inductance variation, the ±10% tolerance of SDR0603-680KL may provide superior performance. However, the ±20% tolerance of the original part is acceptable for most general-purpose filtering and energy storage applications. Circuit simulation should verify tolerance impact on specific application requirements.

Q: Is the SDR0603-680KL physically compatible with the UP0.4C-680 footprint?

A: Physical compatibility requires verification. The SDR0603-680KL footprint (5.80mm x 5.80mm) differs from the UP0.4C-680 footprint (6.60mm x 4.45mm). The seated height also differs (3.90mm versus 2.92mm). PCB layout modifications may be necessary. Mechanical clearance and thermal considerations must be evaluated before implementation.

Q: Why does P0770.683NLT have a lower current rating (400 mA) than the main part (450 mA)?

A: The P0770.683NLT is designed with lower DC resistance (860 mOhm versus 1.1 Ohm), which reduces power dissipation and thermal stress. The lower saturation current (400 mA) reflects the design optimization for reduced losses rather than maximum current capacity. This part is suitable only for applications where the maximum required current does not exceed 400 mA.

Q: What is the significance of the different inductance test frequencies (100 kHz for UP0.4C-680 versus 1 kHz for SDR0603-680KL)?

A: Inductance values are frequency-dependent due to core permeability characteristics. The 100 kHz test frequency for UP0.4C-680 reflects measurement at a higher frequency point, while SDR0603-680KL is specified at 1 kHz. For high-frequency applications (above 10 MHz), the self-resonant frequency (12 MHz for SDR0603-680KL) becomes relevant. Circuit performance at operating frequency should be verified through simulation or testing when substituting between parts with different test frequencies.

Q: Are all substitute parts RoHS compliant?

A: UP0.4C-680-R, P0770.683NLT, and SDR0603-680KL are all RoHS compliant (RoHS3 for the latter two). The original UP0.4C-680 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, any of the three substitute parts satisfy compliance requirements.

Q: Can these inductors be used interchangeably in high-frequency circuits?

A: High-frequency performance depends on self-resonant frequency and Q factor. SDR0603-680KL specifies Q @ 17 at 2.52 MHz and self-resonant frequency of 12 MHz. The original part and other substitutes do not provide these parameters. For circuits operating above 1 MHz, SDR0603-680KL is the preferred choice based on available frequency response data. Other substitutes should be evaluated through circuit simulation or prototype testing.

Q: What packaging considerations apply when transitioning from bulk (UP0.4C-680) to tape & reel formats?

A: Tape & reel packaging (UP0.4C-680-R, P0770.683NLT, SDR0603-680KL) is optimized for automated pick-and-place assembly. Bulk packaging requires manual handling. Tape & reel format reduces component damage during handling and improves assembly efficiency. No electrical or mechanical differences exist; the change is purely logistical and assembly-process related.

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