Nichicon UFG1V331MHM 330µF 35V Radial Aluminum Electrolytic Capacitor

Part Overview

The Nichicon UFG1V331MHM is a 330 µF, 35 V radial aluminum electrolytic capacitor designed for audio applications. This part carries an Obsolete product status, indicating it is no longer in active production. The UFG series operates at 1000 hours lifetime at 85°C with a ±20% capacitance tolerance. Due to its obsolete classification, equivalent and substitute parts with active or improved specifications are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	35 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Lead Spacing	0.197" (5.00mm)
Case Diameter	0.492" (12.50mm)
Height	0.866" (22.00mm)
Mounting Type	Through Hole Radial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the UFG1V331MHM is determined by the following critical parameters:

Primary Substitution Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 35 V minimum (equal or higher voltage acceptable)
Tolerance: ±20% or tighter (±10% acceptable as improvement)
Lead Spacing: 0.197" (5.00mm) (exact match required for PCB compatibility)
Case Diameter: 0.492" (12.50mm) (exact match required for mechanical fit)
Mounting Type: Through Hole Radial (exact match required)
Polarization: Polar (exact match required)

Substitution Categories:

Category 1: Direct Voltage Equivalents (35V rated) Parts maintaining the original 35 V voltage specification with improved or equivalent lifetime characteristics.

Category 2: Voltage Upgrades (50V rated) Parts with elevated voltage ratings (50 V) that provide enhanced safety margins while maintaining identical physical dimensions and lead spacing. These are suitable for direct replacement in applications where the original 35 V specification permits higher-rated components.

Category 3: Higher Voltage Upgrades (63V rated) Parts with 63 V voltage ratings offering maximum safety margin and extended operational capability.

Category 4: Mechanical Variants (Different Case Size) Parts with identical electrical specifications but different physical dimensions, suitable only for applications where PCB layout permits dimensional changes.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Case Diameter	Height	Product Status	RoHS
UFG1V331MHM	Nichicon	UFG	330 µF	35 V	±20%	1000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.492" (12.50mm)	0.866" (22.00mm)	Obsolete	ROHS3
UFG1H331MHM	Nichicon	UFG	330 µF	50 V	±20%	1000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.492" (12.50mm)	0.866" (22.00mm)	Obsolete	ROHS3
UKL1V331MHD	Nichicon	UKL	330 µF	35 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.492" (12.50mm)	0.846" (21.50mm)	Not For New Designs	ROHS3
UKL1V331KHD	Nichicon	UKL	330 µF	35 V	±10%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.492" (12.50mm)	0.846" (21.50mm)	Not For New Designs	ROHS3
UKL1H331KHD	Nichicon	UKL	330 µF	50 V	±10%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.492" (12.50mm)	0.846" (21.50mm)	Not For New Designs	ROHS3
UBT1H331MHD8	Nichicon	UBT	330 µF	50 V	±20%	10000 Hrs @ 125°C	-40°C ~ 125°C	0.197" (5.00mm)	0.492" (12.50mm)	0.866" (22.00mm)	Active	ROHS3
UBW1H331MHD	Nichicon	UBW	330 µF	50 V	±20%	3000 Hrs @ 135°C	-55°C ~ 135°C	0.197" (5.00mm)	0.492" (12.50mm)	0.866" (22.00mm)	Active	ROHS3
UBX1H331MHL	Nichicon	UBX	330 µF	50 V	±20%	1000 Hrs @ 150°C	-55°C ~ 150°C	0.197" (5.00mm)	0.492" (12.50mm)	0.846" (21.50mm)	Active	ROHS3
UPS1J331MHD	Nichicon	UPS	330 µF	63 V	±20%	3000 Hrs @ 105°C	-55°C ~ 105°C	0.197" (5.00mm)	0.492" (12.50mm)	0.866" (22.00mm)	Not For New Designs	ROHS3
UFW1V331MPD	Nichicon	UFW	330 µF	35 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.394" (10.00mm)	0.492" (12.50mm)	Not For New Designs	ROHS3
UKW1V331MPD	Nichicon	UKW	330 µF	35 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.394" (10.00mm)	0.492" (12.50mm)	Not For New Designs	ROHS3

Engineering Selection Recommendations

For Active Production and New Designs:

The UBT1H331MHD8 and UBW1H331MHD are the primary recommended substitutes. Both maintain identical physical dimensions (0.492" diameter, 0.866" height, 5.00mm lead spacing) and electrical specifications (330 µF, ±20% tolerance) while offering 50 V voltage ratings. The UBT1H331MHD8 provides 10000 hours lifetime at 125°C with active product status, making it suitable for long-term production. The UBW1H331MHD extends operating temperature to 135°C with 3000 hours lifetime at that temperature, also maintaining active status.

For Extended Temperature Applications:

The UBX1H331MHL supports operation to 150°C with active product status, maintaining the same physical footprint as the original part. This option is appropriate for applications requiring elevated temperature performance.

For Voltage Margin Enhancement:

The UPS1J331MHD provides 63 V rating with identical physical dimensions, offering maximum safety margin. However, this part carries "Not For New Designs" status and should be considered only for legacy system maintenance.

For Improved Tolerance Requirements:

The UKL1H331KHD and UKL1V331KHD offer ±10% tolerance (tighter than the original ±20%) with 2000 hours lifetime at 85°C. These parts are available in 50 V and 35 V ratings respectively. Both maintain the required 5.00mm lead spacing, though height is reduced to 0.846" (21.50mm).

For Mechanical Variants:

The UFW1V331MPD and UKW1V331MPD feature reduced case diameter (0.394" vs. 0.492") and height (0.492" vs. 0.866"), suitable only for applications where PCB layout accommodates smaller dimensions.

Compliance Consideration:

All substitute parts maintain ROHS3 compliance, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can I use a 50 V rated capacitor in place of the 35 V UFG1V331MHM?

A: Yes. A higher voltage rating provides additional safety margin and is electrically compatible. The UBT1H331MHD8, UBW1H331MHD, and UBX1H331MHL all maintain identical physical dimensions and lead spacing while offering 50 V ratings. Verify that your PCB layout accommodates the specific height of the selected substitute.

Q: What is the difference between the UBT1H331MHD8 and UBW1H331MHD?

A: Both are 330 µF, 50 V, ±20% tolerance capacitors with identical physical dimensions. The UBT1H331MHD8 provides 10000 hours lifetime at 125°C, while the UBW1H331MHD provides 3000 hours lifetime at 135°C. Select based on your application's maximum operating temperature and required lifetime.

Q: Why do some substitutes have "Not For New Designs" status?

A: Parts marked "Not For New Designs" are in limited production or transitioning to obsolescence. While electrically and mechanically compatible, they are not recommended for new product development. For new designs, prioritize parts with Active status: UBT1H331MHD8, UBW1H331MHD, and UBX1H331MHL.

Q: Are the UFW1V331MPD and UKW1V331MPD direct replacements?

A: These parts are electrically equivalent but have different physical dimensions (smaller case diameter and height). They are suitable only if your PCB layout permits the reduced size. Verify mechanical clearance before substitution.

Q: What does ±10% tolerance mean compared to ±20%?

A: ±10% tolerance (UKL series) provides tighter capacitance accuracy than ±20% (UFG series). The actual capacitance will be within ±10% of the rated 330 µF value. This is an improvement over the original specification and is acceptable for direct substitution.

Q: Can I substitute a 63 V rated capacitor for the 35 V original?

A: Yes. The UPS1J331MHD provides 63 V rating with identical physical dimensions and lead spacing. However, this part carries "Not For New Designs" status. For new applications, use the 50 V alternatives (UBT1H331MHD8, UBW1H331MHD, or UBX1H331MHL) which offer active product status.

Q: Do all substitutes maintain the same lead spacing?

A: All recommended substitutes maintain 0.197" (5.00mm) lead spacing, ensuring PCB compatibility. The UFW1V331MPD and UKW1V331MPD are exceptions with different case sizes; verify mechanical fit before use.

Q: What is the significance of "Ripple Current" specifications?

A: Ripple current indicates the maximum AC current the capacitor can handle at specified frequencies. Higher ripple current capability allows operation in higher-stress applications. Verify that your application's ripple current requirements do not exceed the substitute part's rating.

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