LP681M200H1P3 Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The LP681M200H1P3 is a 680 µF, 200 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is Active status and designed for general-purpose applications requiring high capacitance at elevated voltages. Substitute parts are identified to provide alternatives with improved performance characteristics, enhanced reliability ratings, or optimized dimensional specifications for specific installation requirements.

Key Parameters

Parameter	LP681M200H1P3
Capacitance	680 µF
Tolerance	±20%
Voltage - Rated	200 V
ESR (Equivalent Series Resistance) @ 120Hz	370 mOhm
Lifetime @ 105°C	1000 Hrs
Operating Temperature Range	-40°C ~ 105°C
Lead Spacing	0.394" (10.00 mm)
Size / Diameter	1.378" (35.00 mm)
Height - Seated (Max)	0.984" (25.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
RoHS Status	ROHS3 Compliant
Polarization	Polar

Substitute Part Grouping Explanation

Substitute parts for the LP681M200H1P3 are categorized based on electrical and mechanical parameter compatibility. All substitute parts maintain the core electrical specifications: 680 µF capacitance, ±20% tolerance, and 200 V rated voltage. The primary differentiators enabling substitution are:

Allowed Variance Parameters:

ESR (Equivalent Series Resistance): Lower values indicate improved performance
Lifetime @ 105°C: Extended lifetime ratings provide enhanced reliability
Physical dimensions (diameter and height): Within snap-in mounting compatibility constraints
Lead spacing: Maintained at 0.394" (10.00 mm) across all substitutes
Ripple current ratings: Determine thermal performance under operational stress

All substitute parts retain identical polarization (polar), mounting type (through hole), package style (radial, can snap-in), and comply with ROHS3 and REACH requirements.

Parameter Comparison

Parameter	LP681M200H1P3	381LR681M200J032	381LR681M200K022	381LX681M200K022
Capacitance	680 µF	680 µF	680 µF	680 µF
Tolerance	±20%	±20%	±20%	±20%
Voltage - Rated	200 V	200 V	200 V	200 V
ESR @ 120Hz	370 mOhm	219 mOhm	219 mOhm	Not specified
Lifetime @ 105°C	1000 Hrs	3000 Hrs	3000 Hrs	3000 Hrs
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Diameter	1.378" (35.00 mm)	0.984" (25.00 mm)	1.181" (30.00 mm)	1.181" (30.00 mm)
Height - Seated (Max)	0.984" (25.00 mm)	1.457" (37.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)
Ripple Current @ 120Hz	1.51 A	2.42 A	2.42 A	1.7 A
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

381LR681M200J032: This substitute offers 41% lower ESR (219 mOhm vs. 370 mOhm) and triple the thermal lifetime (3000 Hrs vs. 1000 Hrs), with enhanced ripple current capacity. The smaller diameter (25.00 mm vs. 35.00 mm) reduces board space, though the increased height (37.00 mm vs. 25.00 mm) requires vertical clearance verification. Active status and ROHS3 compliance ensure regulatory alignment.

381LR681M200K022: This substitute combines the ESR and thermal lifetime improvements of the 381LR series (219 mOhm, 3000 Hrs) with dimensions positioned between the original and 381LR681M200J032 (30.00 mm diameter, 32.00 mm height). This configuration balances thermal performance with moderate spatial requirements. Active status and ROHS3 compliance confirmed.

381LX681M200K022: This substitute maintains the same form factor as 381LR681M200K022 (30.00 mm diameter, 32.00 mm height) and extended 3000 Hr thermal lifetime. The ESR value is not specified in available documentation. Lower ripple current rating (1.7 A @ 120Hz) requires load verification in high-ripple applications. Active status and ROHS3 compliance established.

All substitute parts comply with ROHS3 and REACH requirements and maintain Active product status, ensuring continued availability and regulatory support.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the LP681M200H1P3? A: Substitute parts must maintain the core electrical specifications: 680 µF capacitance, ±20% tolerance, and 200 V rated voltage. Additionally, lead spacing (10.00 mm), mounting type (through hole), and package style (radial, can snap-in) must match. Physical dimensions (diameter and height) may vary provided they fit the installation space and snap-in mounting frame.

Q: Why are some substitute parts larger or smaller than the original? A: The 381LR series parts use different construction technologies that change physical dimensions while maintaining electrical ratings. The 381LR681M200J032 has a smaller diameter but taller height due to internal design optimization. The 381LR681M200K022 and 381LX681M200K022 offer intermediate dimensions. Board layout and available vertical clearance determine which dimensional configuration is acceptable.

Q: What does the lower ESR in substitute parts mean? A: Equivalent Series Resistance (ESR) of 219 mOhm (in 381LR series parts) versus 370 mOhm (original) results in lower heat dissipation and improved ripple current handling. Lower ESR is advantageous in high-frequency switching applications and reduces voltage ripple at the capacitor terminals.

Q: Are all substitute parts guaranteed to be compatible? A: Compatibility depends on installation constraints. All substitutes share identical lead spacing and snap-in mounting compatibility. However, physical dimensions must fit available board space. The 381LR681M200J032, being smaller in diameter but taller, suits space-constrained layouts where vertical clearance exists. The 381LR681M200K022 and 381LX681M200K022 offer balanced dimensional trade-offs.

Q: What is the difference between 381LR681M200J032 and 381LR681M200K022? A: Both parts feature identical electrical specifications (219 mOhm ESR, 3000 Hr lifetime, 2.42 A ripple current @ 120Hz). The primary difference is physical dimensions: 381LR681M200J032 is 0.984" (25.00 mm) diameter × 1.457" (37.00 mm) height, while 381LR681M200K022 is 1.181" (30.00 mm) diameter × 1.260" (32.00 mm) height. Selection depends on board layout constraints.

Q: How does the 381LX681M200K022 compare to other substitutes? A: The 381LX681M200K022 matches the physical dimensions of 381LR681M200K022 (30.00 mm diameter, 32.00 mm height) and shares the extended 3000 Hr thermal lifetime. However, its ripple current rating is lower (1.7 A @ 120Hz vs. 2.42 A), making it less suitable for high-ripple-current applications. ESR is not specified for this part, limiting thermal analysis in noise-critical circuits.

Q: Can I use a substitute with different voltage rating? A: All listed substitutes are rated for 200 V, matching the original part. No voltage derating is necessary. Using a lower-voltage substitute would be unsuitable for this 200 V application.

Q: What certifications do the substitute parts hold? A: All substitute parts (381LR681M200J032, 381LR681M200K022, 381LX681M200K022) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original LP681M200H1P3. All maintain Active product status, ensuring continued manufacturer support and availability.

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