SXR681M050ST Equivalent & Substitute Parts

Part Overview

The SXR681M050ST is a 680 µF, 50 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 4000 hours at 105°C, suitable for general-purpose applications requiring stable capacitance and low equivalent series resistance.

Key Parameters

Parameter	Value
Capacitance	680 µF
Tolerance	±20%
Voltage - Rated	50 V
ESR (Equivalent Series Resistance)	200 mOhm @ 120 Hz
Lifetime @ Temperature	4000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Lead Spacing	0.197" (5.00 mm)
Size / Dimension	0.472" Dia (12.00 mm)
Height - Seated (Max)	1.378" (35.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SXR681M050ST is determined by the following critical parameters:

Primary Substitution Criteria:

Capacitance value: 680 µF (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Lead spacing: 0.197" (5.00 mm) (exact match required)
Mounting type: Through Hole (exact match required)
Package type: Radial, Can (exact match required)

Secondary Compatibility Parameters:

Voltage rating: Substitute parts must equal or exceed 50 V
Operating temperature range: Substitute parts must support -40°C to 105°C minimum
Physical dimensions: Height and diameter must accommodate PCB layout constraints

The substitute parts identified (EEU-FC1J681L, UPW1J681MHD6, and EKZE630ELL681MK40S) maintain identical capacitance, tolerance, lead spacing, and mounting configuration. All three substitute parts feature 63 V voltage ratings, which exceed the original 50 V specification, providing enhanced voltage margin. Dimensional variations exist in diameter and height; physical verification against PCB layout is required before implementation.

Parameter Comparison

Parameter	SXR681M050ST (Original)	EEU-FC1J681L (Panasonic)	UPW1J681MHD6 (Nichicon)	EKZE630ELL681MK40S (Chemi-Con)
Capacitance	680 µF	680 µF	680 µF	680 µF
Tolerance	±20%	±20%	±20%	±20%
Voltage - Rated	50 V	63 V	63 V	63 V
Lifetime @ 105°C	4000 Hrs	5000 Hrs	7000 Hrs	5000 Hrs
Operating Temperature	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 105°C
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Size / Dimension (Dia)	0.472" (12.00 mm)	0.492" (12.50 mm)	0.492" (12.50 mm)	0.492" (12.50 mm)
Height - Seated (Max)	1.378" (35.00 mm)	1.378" (35.00 mm)	1.398" (35.50 mm)	1.634" (41.50 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Not For New Designs	Active

Engineering Selection Recommendations

EEU-FC1J681L (Panasonic Electronic Components)

This substitute is classified as Active product status with AEC-Q200 automotive qualification. The part provides 5000-hour lifetime at 105°C, exceeding the original 4000-hour specification. Extended operating temperature range (-55°C to 105°C) offers improved low-temperature performance. Panasonic FC series components are widely available with 34,375 pieces in current inventory. This part is suitable for new designs and ongoing production requiring automotive-grade reliability.

UPW1J681MHD6 (Nichicon)

This substitute offers the highest rated lifetime at 7000 hours @ 105°C. Product status is classified as Not For New Designs, limiting its application to legacy system maintenance and repair. The part maintains identical lead spacing and mounting configuration. Height specification of 1.398" (35.50 mm) requires verification against PCB clearance constraints. Current inventory of 1,854 pieces supports limited production volumes.

EKZE630ELL681MK40S (Chemi-Con)

This substitute is classified as Active product status with general-purpose application rating. The part delivers 5000-hour lifetime at 105°C with lowest impedance specification at 21 mOhms, providing superior high-frequency ripple current performance. Height specification of 1.634" (41.50 mm) represents the largest vertical dimension among substitute options and requires explicit PCB layout verification. Current inventory of 11,668 pieces supports sustained production requirements.

Frequently Asked Questions (FAQ)

Q: Can the SXR681M050ST be directly replaced with any of the substitute parts?

A: Direct replacement requires verification of three factors: (1) PCB layout accommodation of dimensional variations, particularly height differences ranging from 1.378" to 1.634"; (2) voltage rating compatibility, as all substitutes feature 63 V ratings exceeding the original 50 V specification; (3) lead spacing confirmation at 0.197" (5.00 mm) for all options.

Q: What is the primary difference between the three substitute parts?

A: The three substitutes differ in product status, lifetime rating, and physical dimensions. EEU-FC1J681L is Active with automotive qualification. UPW1J681MHD6 offers longest lifetime (7000 hours) but is Not For New Designs. EKZE630ELL681MK40S is Active with lowest impedance (21 mOhms) but tallest height (1.634").

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all three substitute parts (EEU-FC1J681L, UPW1J681MHD6, and EKZE630ELL681MK40S) are ROHS3 compliant, matching the original SXR681M050ST compliance status.

Q: What is the impact of the 63 V rating on substitute parts compared to the original 50 V specification?

A: The 63 V rating on all substitute parts provides enhanced voltage margin above the original 50 V specification. This represents an upgrade in voltage capability and does not create compatibility issues in circuits designed for 50 V operation.

Q: Which substitute part is recommended for new design implementations?

A: EEU-FC1J681L is the appropriate choice for new designs, as it maintains Active product status and includes AEC-Q200 automotive qualification. UPW1J681MHD6 is restricted from new designs per product status classification.

Q: How do physical dimensions affect substitution decisions?

A: All substitute parts maintain identical lead spacing (0.197" / 5.00 mm) and diameter specifications of 0.492" (12.50 mm), except the original at 0.472" (12.00 mm). Height variations range from 1.378" to 1.634", requiring PCB layout verification to confirm clearance compatibility with adjacent components and enclosure constraints.

Q: What is the significance of impedance specifications listed for substitute parts?

A: Impedance values (47 mOhms for Panasonic and Nichicon; 21 mOhms for Chemi-Con) indicate high-frequency performance characteristics. Lower impedance values correlate with improved ripple current handling at elevated frequencies, beneficial for switching power supply applications.

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