UKW1H331MPD Equivalent & Substitute Parts

Part Overview

The UKW1H331MPD is a 330 µF, 50 V aluminum electrolytic capacitor in radial configuration manufactured by Nichicon. This component is rated for 2000 hours at 85°C and is designed for audio applications. The part carries a "Not For New Designs" status, making identification of equivalent alternatives essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	50 V
Tolerance	±20%
Lifetime @ 85°C	2000 Hrs
Operating Temperature Range	-40°C ~ 85°C
Polarization	Polar
Mounting Type	Through Hole
Package Type	Radial, Can
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)
Height (Seated Max)	0.630" (16.00 mm)
Ripple Current @ 120 Hz	570 mA
Ripple Current @ 10 kHz	855 mA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the UKW1H331MPD is determined by the following core parameters:

Capacitance value: 330 µF (exact match required)
Voltage rating: 50 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting type: Through Hole (exact match required)
Package type: Radial, Can (exact match required)
Operating temperature range: -40°C ~ 85°C (exact match required)

Substitute parts are grouped into two categories based on thermal lifetime performance:

Category A - Equivalent Thermal Performance (2000 Hrs @ 85°C): UFW1H331MPD (Nichicon UFW series)

Category B - Reduced Thermal Performance (1000 Hrs @ 85°C): UFG1H331MHM (Nichicon UFG series), RFS-50V331MJ7#5 (Elna America RFS/SILMIC II series)

Parameter Comparison

Parameter	UKW1H331MPD	UFW1H331MPD	UFG1H331MHM	RFS-50V331MJ7#5
Manufacturer	Nichicon	Nichicon	Nichicon	Elna America
Series	UKW	UFW	UFG	RFS / SILMIC II
Capacitance	330 µF	330 µF	330 µF	330 µF
Voltage Rating	50 V	50 V	50 V	50 V
Tolerance	±20%	±20%	±20%	±20%
Lifetime @ 85°C	2000 Hrs	2000 Hrs	1000 Hrs	1000 Hrs
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Polarization	Polar	Polar	Polar	Polar
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package Type	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.295" (7.50 mm)
Case Diameter	0.394" (10.00 mm)	0.394" (10.00 mm)	0.492" (12.50 mm)	0.630" (16.00 mm)
Height (Seated Max)	0.630" (16.00 mm)	0.630" (16.00 mm)	0.866" (22.00 mm)	1.240" (31.50 mm)
Ripple Current @ 120 Hz	570 mA	570 mA	488 mA	965 mA
Ripple Current @ 10 kHz	855 mA	855 mA	Not specified	Not specified
Product Status	Not For New Designs	Not For New Designs	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

UFW1H331MPD (Nichicon UFW Series) is the primary equivalent substitute. This part maintains identical electrical specifications, thermal lifetime rating (2000 Hrs @ 85°C), physical dimensions, and ripple current performance. Both the UKW1H331MPD and UFW1H331MPD carry "Not For New Designs" status, indicating comparable product lifecycle positioning. Both are ROHS3 compliant and suitable for direct replacement in existing designs.

UFG1H331MHM (Nichicon UFG Series) is a functional substitute with reduced thermal lifetime (1000 Hrs @ 85°C versus 2000 Hrs). This part is marked as Obsolete. Physical dimensions differ: case diameter increases to 0.492" (12.50 mm) and height to 0.866" (22.00 mm). Ripple current capability at 120 Hz is reduced to 488 mA. This part is suitable only for applications where thermal lifetime requirements are less stringent and PCB layout accommodates larger physical dimensions.

RFS-50V331MJ7#5 (Elna America RFS/SILMIC II Series) is a functional substitute with reduced thermal lifetime (1000 Hrs @ 85°C) and is marked as Obsolete. Physical dimensions are significantly larger: case diameter 0.630" (16.00 mm), height 1.240" (31.50 mm), and lead spacing 0.295" (7.50 mm). Ripple current capability at 120 Hz is higher at 965 mA. This part requires PCB layout modification and is suitable only for applications where thermal lifetime requirements are less stringent and physical space permits larger component dimensions.

Frequently Asked Questions (FAQ)

Q: Can UFW1H331MPD be used as a direct replacement for UKW1H331MPD?

A: Yes. UFW1H331MPD is a parametric equivalent with identical electrical specifications, thermal lifetime rating, physical dimensions, and ripple current performance. No PCB layout modification is required.

Q: What is the difference between the UKW and UFW series?

A: Both series are manufactured by Nichicon and share identical specifications for the 330 µF 50 V rating. The primary difference is series designation; both carry "Not For New Designs" status and are ROHS3 compliant.

Q: Can UFG1H331MHM be used in place of UKW1H331MPD?

A: UFG1H331MHM is functionally compatible but with limitations. Thermal lifetime is reduced from 2000 Hrs to 1000 Hrs @ 85°C. Physical dimensions are larger (0.492" diameter, 0.866" height versus 0.394" diameter, 0.630" height). Ripple current at 120 Hz is reduced to 488 mA. Use only if application thermal requirements are less stringent and PCB layout accommodates larger dimensions.

Q: Can RFS-50V331MJ7#5 be used in place of UKW1H331MPD?

A: RFS-50V331MJ7#5 is functionally compatible but with significant limitations. Thermal lifetime is reduced from 2000 Hrs to 1000 Hrs @ 85°C. Physical dimensions are substantially larger (0.630" diameter, 1.240" height, 0.295" lead spacing). PCB layout modification is required. Use only if application thermal requirements are less stringent and physical space permits larger component dimensions.

Q: What does "Not For New Designs" status mean?

A: This designation indicates the part is in mature production phase and may be discontinued in the future. Existing designs using this part can continue production. New designs should evaluate current-generation alternatives from the manufacturer.

Q: What does "Obsolete" status mean?

A: Obsolete parts are no longer in active production. Inventory availability is limited. These parts are suitable for maintenance and repair of existing equipment but should not be specified for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. UKW1H331MPD, UFW1H331MPD, UFG1H331MHM, and RFS-50V331MJ7#5 are all ROHS3 compliant.

Q: What is the significance of lead spacing differences?

A: Lead spacing determines PCB hole pattern compatibility. UKW1H331MPD, UFW1H331MPD, and UFG1H331MHM all use 0.197" (5.00 mm) lead spacing and are mechanically interchangeable on the same PCB. RFS-50V331MJ7#5 uses 0.295" (7.50 mm) lead spacing and requires PCB modification.

Q: What is the significance of case diameter differences?

A: Case diameter affects PCB footprint and available board space. Larger diameter components may not fit in compact layouts. UKW1H331MPD and UFW1H331MPD use 0.394" (10.00 mm) diameter. UFG1H331MHM uses 0.492" (12.50 mm) diameter. RFS-50V331MJ7#5 uses 0.630" (16.00 mm) diameter.

Q: What is ripple current and why does it matter?

A: Ripple current is the maximum AC current the capacitor can handle without exceeding temperature limits. Higher ripple current capability indicates better performance in high-frequency switching applications. UKW1H331MPD and UFW1H331MPD support 855 mA @ 10 kHz. UFG1H331MHM and RFS-50V331MJ7#5 specifications at 10 kHz are not provided.

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