Nichicon URU1H331MHD Equivalent & Substitute Parts

Part Overview

The Nichicon URU1H331MHD is a 330 µF, 50 V aluminum electrolytic capacitor in radial, can package configuration designed for general purpose applications. This component operates across a temperature range of -40°C to 85°C with a rated lifetime of 2000 hours at 85°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and maintenance requirements.

Key Parameters

Parameter	Value
Capacitance	330 µF
Tolerance	±20%
Voltage - Rated	50 V
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Ripple Current @ 120 Hz	530 mA
Ripple Current @ 10 kHz	795 mA
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.492" (12.50 mm)
Height - Seated (Max)	0.551" (14.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
Polarization	Polar

Substitute Part Grouping Explanation

Substitution of the URU1H331MHD is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Capacitance: 330 µF
Tolerance: ±20%
Voltage Rating: 50 V
Polarization: Polar

Mechanical Parameters (Must Match):

Lead Spacing: 0.197" (5.00 mm)
Mounting Type: Through Hole
Package / Case: Radial, Can

Performance Parameters (Must Match or Exceed):

Lifetime @ Temperature: 2000 Hrs @ 85°C (minimum)
Operating Temperature Range: -40°C ~ 85°C (minimum)

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents — Parts with identical electrical, mechanical, and performance specifications. These provide direct replacement capability with no design modifications required.

Category 2: Similar Substitutes — Parts with identical electrical and mechanical specifications but variations in physical dimensions, ripple current ratings, or thermal performance. These require verification of board layout and thermal environment compatibility.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Operating Temp Range	Case Dia	Height (Max)	Ripple Current @ 120 Hz	Ripple Current @ 10 kHz	Product Status
URU1H331MHD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.492" (12.50 mm)	0.551" (14.00 mm)	530 mA	795 mA	Obsolete
URS1H331MHD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.492" (12.50 mm)	0.551" (14.00 mm)	530 mA	795 mA	Active
URZ1H331MHD	Nichicon	330 µF	50 V	±20%	1000 Hrs @ 105°C	-55°C ~ 105°C	0.492" (12.50 mm)	0.551" (14.00 mm)	370 mA	555 mA	Active
UVR1H331MPD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.394" (10.00 mm)	0.689" (17.50 mm)	590 mA	885 mA	Not For New Designs
ECA-1HM331	Panasonic	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.394" (10.00 mm)	0.669" (17.00 mm)	500 mA	850 mA	Active
ECA-1HM331B	Panasonic	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.394" (10.00 mm)	0.669" (17.00 mm)	500 mA	850 mA	Active
SK331M050ST	Cornell Dubilier Electronics	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.394" (10.00 mm)	0.906" (23.00 mm)	Not Specified	Not Specified	Active
337SAK050M	Cornell Dubilier / Illinois Capacitor	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.492" (12.50 mm)	0.551" (14.00 mm)	520 mA	780 mA	Active

Engineering Selection Recommendations

Primary Recommendation: Nichicon URS1H331MHD

The URS1H331MHD is the preferred direct replacement for the obsolete URU1H331MHD. This part maintains identical electrical specifications, mechanical dimensions, and thermal performance characteristics. The URS1H331MHD is classified as active product status with ROHS3 compliance and extensive inventory availability (1,000,200 pieces in stock). No design modifications or board layout adjustments are required for this substitution.

Secondary Recommendation: Cornell Dubilier 337SAK050M

The 337SAK050M provides parametric equivalence with matching case diameter and height dimensions. This part meets all electrical and mechanical requirements with active product status and ROHS3 compliance. Ripple current specifications are within 2% of the original part at both 120 Hz and 10 kHz frequencies.

Alternative Options with Layout Verification Required:

The Panasonic ECA-1HM331 and ECA-1HM331B offer electrical equivalence but feature reduced case diameter (0.394" versus 0.492") and increased height (0.669" versus 0.551"). These parts are suitable for applications where board space permits the dimensional variation. Both are active products with ROHS3 compliance and high inventory availability.

The Nichicon URZ1H331MHD extends operating temperature range to 105°C and provides enhanced thermal performance for elevated temperature environments. However, ripple current capacity is reduced by approximately 30%, requiring thermal analysis for applications with high AC current demands.

The Nichicon UVR1H331MPD is classified as "Not For New Designs" and should not be selected for new applications despite meeting electrical and thermal specifications.

Frequently Asked Questions (FAQ)

Q: Can the URU1H331MHD be directly replaced with the URS1H331MHD without any modifications?

A: Yes. The URS1H331MHD is a parametric equivalent with identical capacitance, voltage rating, tolerance, case dimensions, lead spacing, and thermal performance. Direct substitution is possible without design changes.

Q: What is the difference between the Nichicon URZ1H331MHD and the URU1H331MHD?

A: The URZ1H331MHD extends the operating temperature range to -55°C to 105°C and provides 1000 hours lifetime at 105°C versus 2000 hours at 85°C for the original part. However, ripple current capacity is reduced by approximately 30%. This part is suitable for high-temperature applications but requires verification that reduced ripple current does not impact circuit performance.

Q: Are the Panasonic ECA-1HM331 and ECA-1HM331B suitable replacements?

A: These parts are electrically and functionally equivalent but feature different physical dimensions. The case diameter is reduced from 0.492" to 0.394", and height is increased from 0.551" to 0.669". Board layout verification is required to confirm adequate clearance. The primary difference between ECA-1HM331 and ECA-1HM331B is packaging format (Bulk versus Tape & Box).

Q: What does "Not For New Designs" mean for the UVR1H331MPD?

A: This designation indicates the manufacturer has discontinued active support for new product development. While the part meets electrical specifications, it should not be selected for new designs. Existing designs using this part may continue to source inventory, but migration to active alternatives is recommended for long-term supply chain stability.

Q: How do I verify compatibility of substitute parts with different case diameters?

A: Verify board layout clearance for the substitute part's physical dimensions. Confirm that the reduced case diameter (0.394" versus 0.492") does not create spacing conflicts with adjacent components. Additionally, verify that increased height does not exceed available vertical clearance in the assembly.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (URS1H331MHD, URZ1H331MHD, ECA-1HM331, ECA-1HM331B, SK331M050ST, and 337SAK050M) are ROHS3 compliant. The original URU1H331MHD and UVR1H331MPD are REACH Unaffected but do not carry explicit RoHS certification.

Q: What is the significance of ESR (Equivalent Series Resistance) specifications?

A: ESR values are not provided for most parts in this comparison. The SK331M050ST specifies 400 mOhm ESR, and the 337SAK050M specifies 603 mOhm @ 120 Hz. Lower ESR generally indicates better high-frequency performance and reduced heat generation. If ESR is critical for your application, contact the manufacturer for complete specifications on parts where this parameter is not listed.

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