UHM1C681MPD Equivalent & Substitute Parts

Part Overview

The UHM1C681MPD is a 680 µF, 16 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is classified as obsolete, indicating it is no longer in active production. Finding equivalent or substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing or repair operations. Substitute parts must maintain electrical compatibility while potentially offering improved performance characteristics such as extended lifetime or enhanced ripple current ratings.

Key Parameters

Parameter	Value
Capacitance	680 µF
Voltage Rating	16 V
Tolerance	±20%
Polarization	Polar
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.197" (5.00mm)
Case Diameter	0.394" (10.00mm)
Height	0.689" (17.50mm)
Operating Temperature Range	-40°C ~ 105°C
Lifetime	2000 Hrs @ 105°C
Application	General Purpose

Substitute Part Grouping Explanation

Substitution of the UHM1C681MPD is determined by the following critical parameters:

Electrical Compatibility Requirements:

Capacitance: 680 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 16 V minimum (equal or higher voltage rating acceptable)
Polarization: Polar (exact match required)

Mechanical Compatibility Requirements:

Package Type: Radial, Can (exact match required)
Lead Spacing: 0.197" (5.00mm) (exact match required)
Case Diameter: 0.394" (10.00mm) (exact match required)
Height: 0.689" (17.50mm) (exact match or smaller acceptable)
Mounting Type: Through Hole (exact match required)

Performance Enhancement Parameters (optional):

Lifetime @ 105°C: 2000 Hrs or greater
Operating Temperature Range: -40°C ~ 105°C or wider
Impedance: Lower values indicate better performance
Ripple Current: Higher values indicate better performance

Substitute parts are grouped into three categories: Upgrade (higher voltage rating or extended lifetime), Similar (same voltage rating with improved lifetime or performance), and Direct (alternative manufacturer equivalent).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lead Spacing	Case Dia	Height	Lifetime @ 105°C	Impedance	Product Status
UHM1C681MPD	Nichicon	680 µF	16 V	±20%	5.00mm	10.00mm	17.50mm	2000 Hrs	18 mOhms	Obsolete
UHV1E681MPD	Nichicon	680 µF	25 V	±20%	5.00mm	10.00mm	17.50mm	6000 Hrs	30 mOhms	Not For New Designs
UHW1E681MPD	Nichicon	680 µF	25 V	±20%	5.00mm	10.00mm	17.50mm	10000 Hrs	30 mOhms	Not For New Designs
UPA1E681MPD	Nichicon	680 µF	25 V	±20%	5.00mm	10.00mm	17.50mm	4000 Hrs	49 mOhms	Active
UPS1C681MPD	Nichicon	680 µF	16 V	±20%	5.00mm	10.00mm	17.50mm	2000 Hrs	140 mOhms	Not For New Designs
UHD1C681MPD6	Nichicon	680 µF	16 V	±20%	5.00mm	10.00mm	17.50mm	4000 Hrs	38 mOhms	Not For New Designs
UHE1C681MPD6	Nichicon	680 µF	16 V	±20%	5.00mm	10.00mm	16.00mm	7000 Hrs	60 mOhms	Not For New Designs
UHV1C681MPD	Nichicon	680 µF	16 V	±20%	5.00mm	10.00mm	14.00mm	6000 Hrs	43 mOhms	Not For New Designs
B41889A4687M	EPCOS - TDK Electronics	680 µF	16 V	±20%	5.00mm	10.00mm	17.00mm	2000 Hrs	390 mOhms @ 120Hz	Active

Engineering Selection Recommendations

For Direct Replacement (Same Electrical and Mechanical Specifications):

UPS1C681MPD maintains identical capacitance, voltage rating, tolerance, and physical dimensions as the UHM1C681MPD. Both are rated for 2000 Hrs @ 105°C. This part is suitable for direct substitution in existing designs where the original part is no longer available. However, product status is "Not For New Designs," indicating limited future availability.

For Improved Reliability (Same Voltage, Extended Lifetime):

UHE1C681MPD6 provides 7000 Hrs @ 105°C lifetime with identical electrical specifications and compatible physical dimensions (height 16.00mm vs. 17.50mm original). This part offers superior reliability for applications requiring extended operational life. Product status is "Not For New Designs."

UHV1C681MPD provides 6000 Hrs @ 105°C lifetime with identical electrical specifications and compatible physical dimensions (height 14.00mm vs. 17.50mm original). This part is suitable for applications where increased reliability is beneficial. Product status is "Not For New Designs."

For Voltage Margin Enhancement (Higher Voltage Rating):

UHV1E681MPD and UHW1E681MPD both provide 25 V rating versus the original 16 V, offering increased voltage margin for the same capacitance and tolerance. UHW1E681MPD provides 10000 Hrs @ 105°C lifetime, the highest available. Both maintain identical lead spacing and case diameter. These parts are suitable for applications where additional voltage headroom is required or beneficial. Product status is "Not For New Designs."

UPA1E681MPD provides 25 V rating with 4000 Hrs @ 105°C lifetime and is the only substitute with "Active" product status, indicating ongoing availability and support for new designs.

For Alternative Manufacturer Supply:

B41889A4687M (EPCOS - TDK Electronics) is an active product providing direct electrical and mechanical compatibility with identical 680 µF, 16 V specifications and 2000 Hrs @ 105°C lifetime. This part is suitable for applications requiring multi-source qualification or where Nichicon supply is constrained. RoHS3 compliance and MSL 1 rating are provided.

Frequently Asked Questions (FAQ)

Q: Can I use a 25 V rated capacitor in place of the 16 V UHM1C681MPD?

A: Yes. A higher voltage rating is electrically compatible and provides additional voltage margin. The UHV1E681MPD, UHW1E681MPD, and UPA1E681MPD all provide 25 V rating with identical 680 µF capacitance and ±20% tolerance. Physical dimensions remain compatible with the original design.

Q: What is the difference between UHV1E681MPD and UHW1E681MPD?

A: Both provide 680 µF, 25 V specifications with identical physical dimensions. The primary difference is lifetime: UHV1E681MPD is rated for 6000 Hrs @ 105°C, while UHW1E681MPD is rated for 10000 Hrs @ 105°C. UHW1E681MPD offers superior reliability for extended-life applications.

Q: Are there any height restrictions I should consider?

A: The original UHM1C681MPD has a maximum seated height of 17.50mm. Substitute parts with equal or smaller heights are mechanically compatible. UHE1C681MPD6 (16.00mm), UHV1C681MPD (14.00mm), and B41889A4687M (17.00mm) all fit within this constraint. UHV1E681MPD, UHW1E681MPD, and UPA1E681MPD match the original height exactly at 17.50mm.

Q: Which substitute part has the lowest impedance?

A: UHV1E681MPD and UHW1E681MPD both provide 30 mOhms impedance, the lowest among 25 V rated substitutes. For 16 V rated parts, UHD1C681MPD6 provides 38 mOhms, and UHV1C681MPD provides 43 mOhms.

Q: Is the B41889A4687M from EPCOS a suitable alternative?

A: Yes. The B41889A4687M provides identical electrical specifications (680 µF, 16 V, ±20% tolerance) and compatible physical dimensions. As an active product from EPCOS - TDK Electronics, it offers ongoing supply availability. This part is suitable for applications requiring multi-source qualification or where Nichicon supply is unavailable.

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

A: This designation indicates the manufacturer is not recommending the part for new circuit designs, though existing inventory may remain available. For new designs, UPA1E681MPD (Nichicon, Active status) or B41889A4687M (EPCOS, Active status) are preferred choices.

Q: Can I use UPA1E681MPD as a direct replacement?

A: UPA1E681MPD provides 680 µF, 25 V specifications with compatible physical dimensions and lead spacing. The higher voltage rating (25 V vs. 16 V) is electrically compatible. However, the operating temperature range extends to -55°C (versus -40°C original), and it is the only substitute with Active product status, making it suitable for new designs requiring long-term availability.

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