Equivalent & Substitute Parts for 687KXM025M

Part Overview

The 687KXM025M is a 680 µF, 25 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier / Illinois Capacitor. This component is classified as Active product status and is designed for general-purpose applications requiring through-hole mounting. The part operates across a temperature range of -55°C to 105°C with a rated lifetime of 4000 hours at 105°C. Substitute parts are identified to address inventory availability, extended operational lifetime requirements, or enhanced electrical performance characteristics while maintaining core functional compatibility.

Key Parameters

Parameter	Specification
Capacitance	680 µF
Voltage Rating	25 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)
Operating Temperature Range	-55°C to 105°C
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 687KXM025M are identified based on strict electrical and mechanical parameter compatibility. The substitution logic is governed by the following criteria:

Primary Compatibility Requirements:

Capacitance value: 680 µF (exact match required)
Tolerance: ±20% (exact match required)
Package type: Radial, Can (exact match required)
Lead spacing: 0.197" (5.00 mm) (exact match required)
Case diameter: 0.394" (10.00 mm) (exact match required)
Mounting type: Through Hole (exact match required)
Operating temperature range: -55°C to 105°C (exact match required)
Polarization: Polar (exact match required)

Allowable Variation Parameters:

Voltage rating: Equal to or greater than 25 V
Lifetime at temperature: Equal to or greater than 4000 hours at 105°C
ESR and impedance: Lower values indicate improved performance
Ripple current capability: Higher values indicate improved performance

The identified substitute parts meet all primary compatibility requirements. Variations in voltage rating and thermal lifetime represent performance enhancements or alternative specifications suitable for specific application contexts.

Parameter Comparison

Parameter	687KXM025M (Main)	ELXZ250ELL681MJ20S	ELZA350ELL681MJ20S
Manufacturer	Cornell Dubilier / Illinois Capacitor	Chemi-Con	Chemi-Con
Series	KXM	LXZ	LZA
Capacitance	680 µF	680 µF	680 µF
Tolerance	±20%	±20%	±20%
Voltage Rating	25 V	25 V	35 V
ESR @ 120 Hz	341.3 mOhm	Not specified	Not specified
Lifetime @ 105°C	4000 Hrs	5000 Hrs	4000 Hrs
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Ripple Current @ 120 Hz	1.092 A	732 mA	930 mA
Ripple Current @ 100 kHz	1.82 A	1.22 A	1.55 A
Impedance	69 mOhms	52 mOhms	35 mOhms
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Height (Max)	0.866" (22.00 mm)	0.846" (21.50 mm)	0.846" (21.50 mm)
Package Type	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

ELXZ250ELL681MJ20S (Chemi-Con LXZ Series)

This substitute maintains the 25 V voltage rating of the original 687KXM025M while providing extended thermal lifetime of 5000 hours at 105°C compared to the original 4000 hours. The part carries AEC-Q200 automotive qualification and ROHS3 compliance. The lower impedance (52 mOhms versus 69 mOhms) and reduced ESR provide improved electrical performance. Physical dimensions are compatible with the original, with a maximum seated height of 0.846" (21.50 mm) versus 0.866" (22.00 mm) for the original part. This substitute is suitable for applications requiring extended operational lifetime or improved thermal performance within the same voltage class.

ELZA350ELL681MJ20S (Chemi-Con LZA Series)

This substitute provides a higher voltage rating of 35 V while maintaining the 680 µF capacitance and ±20% tolerance. The thermal lifetime matches the original at 4000 hours at 105°C. The part carries AEC-Q200 automotive qualification and ROHS3 compliance. The significantly lower impedance (35 mOhms versus 69 mOhms) and improved ripple current handling at both 120 Hz and 100 kHz provide enhanced electrical performance. Physical dimensions are compatible with the original. This substitute is suitable for applications where higher voltage margin is required or where improved electrical performance characteristics are beneficial.

Both substitute parts are Active status products with full regulatory compliance. Selection between substitutes depends on whether extended thermal lifetime (ELXZ250ELL681MJ20S) or higher voltage rating with improved impedance (ELZA350ELL681MJ20S) aligns with application requirements.

Frequently Asked Questions (FAQ)

Q: Can ELXZ250ELL681MJ20S be used as a direct replacement for 687KXM025M?

A: Yes. Both parts share identical capacitance (680 µF), tolerance (±20%), voltage rating (25 V), lead spacing (0.197" / 5.00 mm), case diameter (0.394" / 10.00 mm), operating temperature range (-55°C to 105°C), and mounting type (through-hole radial can). The ELXZ250ELL681MJ20S provides extended thermal lifetime (5000 hours versus 4000 hours at 105°C) and lower impedance, making it functionally compatible and electrically superior.

Q: Can ELZA350ELL681MJ20S be used as a direct replacement for 687KXM025M?

A: Yes. Both parts share identical capacitance (680 µF), tolerance (±20%), lead spacing (0.197" / 5.00 mm), case diameter (0.394" / 10.00 mm), operating temperature range (-55°C to 105°C), and mounting type (through-hole radial can). The ELZA350ELL681MJ20S has a higher voltage rating (35 V versus 25 V), which provides additional voltage margin. The lower impedance (35 mOhms versus 69 mOhms) represents improved electrical performance.

Q: What is the physical compatibility between these parts?

A: All three parts use identical lead spacing (0.197" / 5.00 mm) and case diameter (0.394" / 10.00 mm), ensuring PCB footprint compatibility. The substitute parts have slightly reduced maximum seated heights (0.846" / 21.50 mm versus 0.866" / 22.00 mm), which presents no clearance issues in standard through-hole applications.

Q: Are there differences in ripple current handling?

A: Yes. The 687KXM025M specifies 1.092 A at 120 Hz and 1.82 A at 100 kHz. The ELXZ250ELL681MJ20S specifies 732 mA at 120 Hz and 1.22 A at 100 kHz. The ELZA350ELL681MJ20S specifies 930 mA at 120 Hz and 1.55 A at 100 kHz. Applications with specific ripple current requirements should verify compatibility with the selected substitute.

Q: What certifications do the substitute parts carry?

A: Both ELXZ250ELL681MJ20S and ELZA350ELL681MJ20S carry AEC-Q200 automotive qualification and ROHS3 compliance. The original 687KXM025M carries ROHS3 compliance. All three parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Which substitute should be selected for extended operational life?

A: The ELXZ250ELL681MJ20S provides extended thermal lifetime of 5000 hours at 105°C compared to 4000 hours for both the original part and the ELZA350ELL681MJ20S.

Q: Which substitute provides the lowest impedance?

A: The ELZA350ELL681MJ20S provides the lowest impedance at 35 mOhms, compared to 52 mOhms for ELXZ250ELL681MJ20S and 69 mOhms for the original 687KXM025M.

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