UFW1H331MPD Equivalent & Substitute Parts

Part Overview

The UFW1H331MPD 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, indicating that while it remains available in inventory, alternative solutions should be evaluated for new product development. Identifying equivalent and substitute parts is necessary to ensure design continuity, manage supply chain flexibility, and support legacy system maintenance.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	50 V
Tolerance	±20%
Lifetime @ Temperature	2000 Hrs @ 85°C
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)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the UFW1H331MPD is determined by the following critical parameters:

Primary Electrical Parameters: Capacitance (330 µF), voltage rating (50 V), and tolerance (±20%) must match exactly. These parameters define the functional equivalence of the capacitor in the circuit.

Thermal Performance: Lifetime rating at 85°C is a key differentiator. The UFW1H331MPD specifies 2000 hours at 85°C. Substitutes with lower lifetime ratings (1000 hours) represent reduced thermal endurance and may not be suitable for applications requiring extended operational life at elevated temperatures.

Mechanical Compatibility: Lead spacing (0.197" / 5.00 mm), case diameter (0.394" / 10.00 mm), and seated height (0.630" / 16.00 mm) must accommodate the PCB layout and physical constraints. Substitutes with different mechanical dimensions require board redesign.

Compliance & Status: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. Product status (Not For New Designs vs. Obsolete) indicates availability and design recommendation level.

The substitute parts are grouped as follows:

Parametric Equivalent (Full Compatibility): UKW1H331MPD matches all electrical and mechanical parameters, including the 2000-hour lifetime rating and identical case dimensions.

Similar Parts (Electrical Match, Reduced Thermal Rating): UFG1H331MHM and RFS-50V331MJ7#5 match capacitance, voltage, and tolerance but feature 1000-hour lifetime ratings and different case dimensions, requiring evaluation for thermal and spatial constraints.

Parameter Comparison

Parameter	UFW1H331MPD	UKW1H331MPD	UFG1H331MHM	RFS-50V331MJ7#5
Manufacturer	Nichicon	Nichicon	Nichicon	Elna America
Series	UFW	UKW	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
Ripple Current @ 120 Hz	570 mA	570 mA	488 mA	965 mA
Ripple Current @ 10 kHz	855 mA	855 mA	Not specified	Not specified
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)
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

Direct Replacement (No Design Changes Required): UKW1H331MPD is the parametric equivalent to UFW1H331MPD. Both parts share identical electrical specifications (330 µF, 50 V, ±20%), thermal rating (2000 hours at 85°C), and mechanical dimensions (0.197" lead spacing, 0.394" diameter, 0.630" height). Both carry "Not For New Designs" status, indicating equivalent lifecycle positioning. This substitute requires no PCB layout modification and maintains full functional compatibility.

Conditional Substitution (Thermal Derating Required): UFG1H331MHM and RFS-50V331MJ7#5 match the core electrical parameters but feature reduced thermal endurance (1000 hours at 85°C versus 2000 hours). These parts are suitable only for applications where the lower lifetime rating does not compromise system reliability. Both parts are marked as Obsolete, indicating limited future availability.

Mechanical Constraint Consideration: RFS-50V331MJ7#5 requires PCB redesign due to larger case dimensions (0.630" diameter, 1.240" height) and wider lead spacing (0.295"). UFG1H331MHM also requires layout modification (0.492" diameter, 0.866" height) but maintains the standard 0.197" lead spacing.

Compliance Status: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original UFW1H331MPD.

Frequently Asked Questions (FAQ)

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

A: Yes. UKW1H331MPD is a parametric equivalent with matching capacitance (330 µF), voltage rating (50 V), tolerance (±20%), thermal rating (2000 hours at 85°C), and mechanical dimensions. No design changes are required.

Q: What is the difference between UFW1H331MPD and UFG1H331MHM?

A: Both parts share identical electrical specifications (330 µF, 50 V, ±20% tolerance). The primary difference is thermal endurance: UFW1H331MPD is rated for 2000 hours at 85°C, while UFG1H331MHM is rated for 1000 hours at 85°C. Additionally, UFG1H331MHM has a larger case diameter (0.492" versus 0.394") and greater height (0.866" versus 0.630"), requiring PCB layout modification.

Q: Is RFS-50V331MJ7#5 compatible with UFW1H331MPD?

A: RFS-50V331MJ7#5 matches the electrical specifications but differs significantly in mechanical dimensions and thermal rating. The case diameter (0.630"), height (1.240"), and lead spacing (0.295") are substantially larger than UFW1H331MPD, requiring PCB redesign. The thermal rating is also reduced to 1000 hours at 85°C. Substitution is possible only if the application tolerates these mechanical and thermal differences.

Q: Why do some substitutes have different case diameters and heights?

A: Aluminum electrolytic capacitors with identical electrical ratings can be manufactured in different physical packages by different manufacturers or series. Larger case dimensions typically correlate with different internal construction or thermal management approaches. PCB layout must accommodate the specific mechanical dimensions of the selected part.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed—UKW1H331MPD, UFG1H331MHM, and RFS-50V331MJ7#5—are ROHS3 compliant and REACH unaffected, matching the compliance status of UFW1H331MPD.

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

A: "Not For New Designs" indicates that the manufacturer recommends against using this part in new product development, though the part remains available. This status typically reflects the manufacturer's strategic direction or product lifecycle planning. For new designs, consulting the manufacturer for current-generation alternatives is advisable.

Q: Can I use an Obsolete part as a substitute?

A: Obsolete parts (UFG1H331MHM and RFS-50V331MJ7#5) are no longer actively manufactured and have limited availability. While they may be available from inventory, future procurement cannot be guaranteed. Use of obsolete parts should be limited to legacy system maintenance or short-term production runs where supply continuity is not critical.

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