SH331M100ST Equivalent & Substitute Parts Reference

Part Overview

The SH331M100ST is a 330 µF, 100 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Obsolete and is no longer recommended for new designs. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 2000 hours at 105°C, making it suitable for general-purpose applications requiring stable capacitance and moderate ripple current handling.

Due to its obsolete status, identifying equivalent and substitute parts is necessary to maintain design continuity, support existing inventory management, and ensure component availability for legacy system maintenance and repairs.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	100	V
Tolerance	±20%	-
ESR (Equivalent Series Resistance)	400	mOhm @ 120Hz
Lifetime @ Temperature	2000	Hrs @ 105°C
Operating Temperature Range	-40°C to 105°C	-
Lead Spacing	0.295"	(7.50 mm)
Size / Dimension	0.630" Dia	(16.00 mm)
Height - Seated (Max)	0.984"	(25.00 mm)
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
Polarization	Polar	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SH331M100ST is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 100 V (minimum requirement; higher ratings acceptable)
Tolerance: ±20% (acceptable range for general-purpose applications)
Package Type: Radial, Can (through-hole mounting)
Lead Spacing: 0.295" (7.50 mm)
Physical Dimensions: 0.630" Dia × 0.984" Height (maximum seated height)
Polarization: Polar (electrolytic capacitor type)

Acceptable Variation Parameters:

Operating Temperature Range: Substitute parts may have extended lower temperature limits (-55°C vs. -40°C)
Lifetime @ Temperature: Substitute parts may have extended lifetime ratings (8000 Hrs vs. 2000 Hrs @ 105°C)
ESR: Substitute parts may have lower ESR values
Ripple Current: Substitute parts may have different ripple current specifications

The two substitute parts identified—SEK331M100ST (Cornell Dubilier Electronics) and UPW2A331MHD (Nichicon)—meet all critical matching parameters and are therefore electrically and mechanically compatible with the SH331M100ST in applications where the original component is specified.

Parameter Comparison

Parameter	SH331M100ST (Main)	SEK331M100ST (Substitute)	UPW2A331MHD (Substitute)
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Nichicon
Capacitance	330 µF	330 µF	330 µF
Voltage - Rated	100 V	100 V	100 V
Tolerance	±20%	±20%	±20%
ESR	400 mOhm @ 120Hz	400 mOhm	90 mOhms (Impedance)
Lifetime @ Temperature	2000 Hrs @ 105°C	2000 Hrs @ 105°C	8000 Hrs @ 105°C
Operating Temperature	-40°C to 105°C	-55°C to 105°C	-55°C to 105°C
Lead Spacing	0.295" (7.50 mm)	0.295" (7.50 mm)	0.295" (7.50 mm)
Size / Dimension	0.630" Dia (16.00 mm)	0.630" Dia (16.00 mm)	0.630" Dia (16.00 mm)
Height - Seated (Max)	0.984" (25.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can
Polarization	Polar	Not specified	Polar
Product Status	Obsolete	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SEK331M100ST (Cornell Dubilier Electronics)

The SEK331M100ST is an active product from the same manufacturer as the original SH331M100ST. It maintains identical electrical specifications (330 µF, 100 V, ±20% tolerance, 400 mOhm ESR, 2000 Hrs @ 105°C) and mechanical dimensions. The SEK series offers an extended operating temperature range (-55°C to 105°C) compared to the SH series (-40°C to 105°C). This part is ROHS3 compliant and carries REACH Unaffected status, making it suitable for new designs and legacy system replacements where manufacturer continuity is preferred.

UPW2A331MHD (Nichicon)

The UPW2A331MHD is a Nichicon aluminum electrolytic capacitor with identical capacitance, voltage rating, tolerance, and physical dimensions to the SH331M100ST. This part is classified as "Not For New Designs" but remains available in high inventory (16,387 pcs). The UPW2A331MHD offers significant performance advantages: extended lifetime rating of 8000 Hrs @ 105°C (versus 2000 Hrs), lower impedance (90 mOhms), and extended operating temperature range (-55°C to 105°C). This part is ROHS3 compliant and REACH Unaffected. The UPW2A331MHD is appropriate for legacy system support and retrofit applications where enhanced reliability and longer operational life are beneficial.

Selection Criteria:

For new designs and long-term availability: Select SEK331M100ST
For legacy system maintenance with enhanced reliability: Select UPW2A331MHD
For direct replacement in existing assemblies: Either substitute is mechanically and electrically compatible

All three parts are through-hole radial can packages with identical lead spacing and physical footprints, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the SEK331M100ST directly replace the SH331M100ST without PCB modifications?

A: Yes. The SEK331M100ST maintains identical lead spacing (0.295" / 7.50 mm), can diameter (0.630" / 16.00 mm), and maximum seated height (0.984" / 25.00 mm). No PCB layout changes are required for direct substitution.

Q: What is the difference between the SH331M100ST and UPW2A331MHD in terms of reliability?

A: The UPW2A331MHD has a rated lifetime of 8000 Hrs @ 105°C, compared to 2000 Hrs @ 105°C for the SH331M100ST. This represents a 4× improvement in thermal life rating. The UPW2A331MHD also features lower impedance (90 mOhms), which reduces heat generation in ripple current applications.

Q: Are all three parts RoHS compliant?

A: Yes. The SH331M100ST, SEK331M100ST, and UPW2A331MHD are all ROHS3 compliant. The SEK331M100ST and UPW2A331MHD carry additional REACH Unaffected certification.

Q: Why is the UPW2A331MHD marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that Nichicon is not actively promoting this part for new product development. However, the part remains in production and available for legacy system support, maintenance, and retrofit applications. This designation does not affect its suitability for replacement in existing designs.

Q: Can I use a 100 V rated capacitor in place of the SH331M100ST in a circuit designed for 100 V operation?

A: Yes, provided all other electrical parameters (capacitance, tolerance, ESR, ripple current) and mechanical parameters (lead spacing, physical dimensions) match the original specification. Both substitute parts are rated for 100 V and are compatible.

Q: What is the significance of the ±20% tolerance specification?

A: The ±20% tolerance indicates that the actual capacitance value may vary between 264 µF and 396 µF from the nominal 330 µF rating. This tolerance is acceptable for general-purpose applications. All three parts share this tolerance specification, ensuring equivalent performance in circuits designed for this tolerance band.

Q: Are there any differences in ripple current handling between the three parts?

A: The SH331M100ST specifies 720 mA @ 120 Hz and 1.008 A @ 10 kHz. The UPW2A331MHD specifies 702 mA @ 120 Hz and 1.08 A @ 100 kHz. These values are comparable and within acceptable operating ranges for general-purpose applications. The SEK331M100ST does not provide ripple current specifications in the available data.

Q: Can these capacitors be used in high-frequency switching applications?

A: These are general-purpose aluminum electrolytic capacitors designed for standard industrial and consumer applications. For high-frequency switching applications (above 10 kHz), circuit designers should evaluate ripple current specifications and ESR characteristics against specific application requirements.

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