SLP681M350H4P3 Equivalent & Substitute Parts Reference

Part Overview

The SLP681M350H4P3 is a 680 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Active product status and is designed for general-purpose applications requiring high-capacitance energy storage in power supply and filtering circuits.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter tolerances for this product category. Substitutes listed in this reference maintain the same capacitance value (680 µF), tolerance (±20%), physical dimensions (35 mm diameter, 47 mm height), lead spacing (10 mm), and mounting configuration (through-hole snap-in).

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	680	µF	Critical - Must match exactly
Tolerance	±20%	%	Critical - Must match exactly
Voltage - Rated	350	V	Critical - Substitutes must equal or exceed
Lead Spacing	10.00	mm	Critical - Must match for PCB compatibility
Size / Dimension	35.00 Dia	mm	Critical - Must match for mechanical fit
Height - Seated (Max)	47.00	mm	Critical - Must match for clearance
Package / Case	Radial, Can - Snap-In	-	Critical - Must match mounting type
Mounting Type	Through Hole	-	Critical - Must match PCB assembly method
Operating Temperature	-25°C ~ 105°C	°C	Important - Substitutes must cover or exceed range
Lifetime @ Temp.	3000	Hrs @ 105°C	Important - Substitutes may equal or exceed
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance
Polarization	Polar	-	Critical - Must match polarity requirement

Substitute Part Grouping Explanation

Substitute parts for the SLP681M350H4P3 are qualified based on the following substitution logic:

Critical Matching Parameters:

Capacitance: 680 µF (exact match required)
Tolerance: ±20% (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Physical Dimensions: 35 mm diameter, 47 mm height maximum (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)

Voltage Substitution Rule: Substitute parts must have a rated voltage equal to or greater than 350 V. All qualified substitutes in this reference operate at 400 V, which exceeds the original specification and provides enhanced voltage margin.

Temperature and Lifetime Considerations: Substitute parts must support the operating temperature range of -25°C to 105°C. Lifetime ratings at 105°C may equal or exceed the original 3000 hours specification. Extended lifetime ratings (5000 hours) represent enhanced reliability but do not disqualify a part from substitution.

Compliance Requirements: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original component.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance (%)	ESR @ Frequency	Lifetime @ 105°C (Hrs)	Operating Temp (°C)	Lead Spacing (mm)	Size Dia (mm)	Height Max (mm)	Ripple Current @ 120 Hz (A)
SLP681M350H4P3	Cornell Dubilier Electronics	SLP0712TE	680	350	±20	488 mOhm @ 120 Hz	3000	-25 ~ 105	10.00	35.00	47.00	2.2
400MXG680MEFCSN35X45	Rubycon	MXG	680	400	±20	Not specified	3000	-25 ~ 105	10.00	35.00	47.00	2.27
B43508B9687M000	EPCOS - TDK Electronics	B43508	680	400	±20	180 mOhm @ 100 Hz	3000	-40 ~ 105	10.00	35.00	47.00	2.07
B43644A9687M000	EPCOS - TDK Electronics	B43644	680	400	±20	140 mOhm @ 100 Hz	5000	-40 ~ 105	10.00	35.00	47.00	2.53
LGN2G681MELC45	Nichicon	LGN	680	400	±20	Not specified	3000	-25 ~ 105	10.00	35.00	47.00	2.12
LGX2G681MELC45	Nichicon	LGX	680	400	±20	Not specified	5000	-25 ~ 105	10.00	35.00	47.00	2.12
LQS2G681MELC45	Nichicon	LQS	680	400	±20	Not specified	3000	-25 ~ 105	10.00	35.00	47.00	2.12

Engineering Selection Recommendations

All substitute parts listed in this reference maintain Active product status and full compliance with ROHS3 and REACH regulations, ensuring regulatory alignment with the original SLP681M350H4P3 component.

Voltage Margin Enhancement: All substitute parts operate at 400 V rated voltage, compared to the original 350 V specification. This 50 V increase provides additional voltage margin in applications where the original component operates near its rated limit.

Thermal Performance Considerations: Substitute parts maintain the -25°C to 105°C operating temperature range or extend it to -40°C minimum (EPCOS B43508 and B43644 series). Extended temperature range does not affect substitution validity but may provide operational benefits in extreme cold environments.

Lifetime Rating Options: Standard lifetime substitutes (3000 hours @ 105°C) are available from Rubycon MXG, Nichicon LGN, and Nichicon LQS series. Extended lifetime substitutes (5000 hours @ 105°C) are available from EPCOS B43644 and Nichicon LGX series. Selection between standard and extended lifetime depends on application reliability requirements, not substitution eligibility.

Equivalent Series Resistance (ESR): Where ESR data is provided, substitute parts demonstrate comparable or superior performance. EPCOS B43644A9687M000 exhibits the lowest ESR at 140 mOhm @ 100 Hz, while EPCOS B43508B9687M000 provides 180 mOhm @ 100 Hz. These values support low-impedance filtering applications.

Ripple Current Capacity: All substitute parts maintain ripple current capacity within the range of 2.07 A to 2.53 A @ 120 Hz, supporting equivalent or enhanced current handling compared to the original 2.2 A specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 400 V rated capacitor for the original 350 V component?

A: Yes. A higher voltage rating (400 V) is a valid substitution for a lower voltage requirement (350 V). The capacitor will operate safely with additional voltage margin. This is a standard engineering practice that does not compromise circuit function.

Q: Are all substitute parts mechanically identical to the original SLP681M350H4P3?

A: Yes. All substitute parts share identical physical dimensions (35 mm diameter, 47 mm height), lead spacing (10 mm), and snap-in mounting configuration. They are direct mechanical replacements on the PCB.

Q: What is the difference between 3000-hour and 5000-hour lifetime ratings?

A: Lifetime rating indicates the expected operational duration at maximum rated temperature (105°C) before capacitance degradation reaches specified limits. A 5000-hour rating provides extended service life compared to 3000 hours. Both ratings are acceptable substitutes; selection depends on application longevity requirements.

Q: Do I need to verify ESR specifications before substitution?

A: ESR (Equivalent Series Resistance) is provided for reference where available. All substitute parts maintain ESR values compatible with general-purpose filtering applications. If your circuit has specific ESR requirements, consult the detailed datasheet for the selected substitute part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original component.

Q: Can I use a substitute part with an extended operating temperature range (-40°C to 105°C instead of -25°C to 105°C)?

A: Yes. An extended temperature range is a superset of the original range and does not disqualify substitution. The component will function correctly across the original operating window and provide additional capability at lower temperatures.

Q: What is the significance of different manufacturer series (MXG, B43508, LGN, LGX, LQS)?

A: Series designations identify different product lines within each manufacturer's portfolio. Each series may have distinct internal construction, performance characteristics, or reliability ratings. All listed series are qualified substitutes based on matching critical electrical and mechanical parameters.

Q: If ESR is not specified for a substitute part, does that affect substitution validity?

A: No. ESR data is supplementary performance information. Absence of ESR specification does not invalidate substitution, as all parts meet the critical matching criteria: capacitance, voltage, tolerance, physical dimensions, and package type. Consult the manufacturer datasheet if ESR is critical to your application.

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