UPJ1E181MPD Equivalent & Substitute Parts

Part Overview

The UPJ1E181MPD is a 180 µF, 25 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is classified as Not For New Designs, indicating it has been superseded in the product lifecycle. Finding equivalent and substitute parts is necessary for maintenance, repair, and legacy system support where original components may no longer be readily available or where design improvements are desired.

Key Parameters

Parameter	Value
Capacitance	180 µF
Voltage Rating	25 V
Tolerance	±20%
Lifetime @ 105°C	3000 Hrs
Operating Temperature Range	-55°C ~ 105°C
Polarization	Polar
Package Type	Radial, Can
Lead Spacing	0.138" (4.60mm)
Diameter	0.315" (8.00mm)
Height	0.630" (16.00mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the UPJ1E181MPD is determined by the following critical parameters:

Capacitance: Must be 180 µF (exact match required)
Voltage Rating: Minimum 25 V (equal or higher voltage rating is acceptable)
Tolerance: ±20% (standard tolerance match)
Package Type: Radial, Can through-hole configuration
Lead Spacing: 0.138" (4.60mm) preferred for direct PCB compatibility; 0.197" (5.00mm) requires PCB layout verification
Physical Dimensions: Diameter and height must accommodate existing PCB footprint and clearance constraints
Polarization: Polar (required for electrolytic capacitor function)

Substitutes are grouped into two categories:

Similar Voltage (25 V): Direct replacements maintaining the same voltage rating. These parts preserve the original circuit design margin.

Upgraded Voltage (35 V): Higher voltage-rated alternatives that provide increased design margin and improved reliability. These are electrically compatible and backward-compatible with 25 V circuits.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Lifetime @ 105°C	Lead Spacing	Diameter	Height	Product Status	Impedance
UPJ1E181MPD	Nichicon	180 µF	25 V	3000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.630" (16.00mm)	Not For New Designs	220 mOhms
UPJ1E181MPD6	Nichicon	180 µF	25 V	5000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.551" (14.00mm)	Not For New Designs	240 mOhms
EEU-FC1E181BJ	Panasonic Electronic Components	180 µF	25 V	2000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.492" (12.50mm)	Active	117 mOhms
EEU-FC1E181B	Panasonic Electronic Components	180 µF	25 V	2000 Hrs	0.197" (5.00mm)	0.315" (8.00mm)	0.650" (16.50mm)	Active	117 mOhms
EEU-FC1E181	Panasonic Electronic Components	180 µF	25 V	2000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.453" (11.50mm)	Active	117 mOhms
ELXY250ELL181MJC5S	Chemi-Con	180 µF	25 V	5000 Hrs	0.197" (5.00mm)	0.394" (10.00mm)	0.551" (14.00mm)	Active	120 mOhms
ELXY350ELL181MH15D	Chemi-Con	180 µF	35 V	3000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.650" (16.50mm)	Active	130 mOhms
ELXV350ELL181MH15D	Chemi-Con	180 µF	35 V	3000 Hrs	0.138" (4.60mm)	0.315" (8.00mm)	0.650" (16.50mm)	Active	160 mOhms

Engineering Selection Recommendations

For Direct Replacement (Same Voltage, 25 V):

EEU-FC1E181BJ (Panasonic) is the preferred direct substitute. It maintains 25 V voltage rating, offers Active product status, and provides identical lead spacing (0.138" / 4.60mm) for direct PCB compatibility. The lower impedance (117 mOhms vs. 220 mOhms) improves ripple current performance. Panasonic's AEC-Q200 automotive qualification provides additional reliability assurance.

EEU-FC1E181 (Panasonic) is an alternative with the same electrical specifications and lead spacing, with a more compact height (0.453" vs. 0.630"), suitable where vertical clearance is constrained.

For Extended Lifetime (Same Voltage, 25 V):

ELXY250ELL181MJC5S (Chemi-Con) extends operational lifetime to 5000 Hrs @ 105°C while maintaining 25 V rating and Active product status. This part requires PCB layout verification due to different lead spacing (0.197" vs. 0.138") and larger physical dimensions.

For Upgraded Voltage Rating (35 V):

ELXY350ELL181MH15D (Chemi-Con) provides 35 V rating with Active product status and AEC-Q200 automotive qualification. It maintains the original lead spacing (0.138" / 4.60mm) and diameter (0.315" / 8.00mm), requiring only height verification (0.650" vs. 0.630"). The 35 V rating increases design margin and is backward-compatible with 25 V circuits.

ELXV350ELL181MH15D (Chemi-Con) offers identical electrical specifications to ELXY350ELL181MH15D with Active product status and AEC-Q200 qualification, with slightly higher impedance (160 mOhms).

Avoid for New Designs:

UPJ1E181MPD6 (Nichicon) carries Not For New Designs status and requires PCB layout modification due to different lead spacing and dimensions.

Frequently Asked Questions (FAQ)

Q: Can I use a 35 V rated capacitor in place of a 25 V capacitor?

A: Yes. A higher voltage-rated capacitor is electrically compatible with a lower voltage circuit. The 35 V alternatives (ELXY350ELL181MH15D, ELXV350ELL181MH15D) provide increased design margin and improved reliability in 25 V applications.

Q: What is the impact of different lead spacing on substitution?

A: Lead spacing determines PCB hole alignment. The original UPJ1E181MPD uses 0.138" (4.60mm) spacing. Substitutes with 0.197" (5.00mm) spacing require PCB layout verification and may not fit existing footprints without modification. Direct replacements maintain 0.138" spacing for plug-and-play compatibility.

Q: Why do some substitutes have lower lifetime ratings?

A: Panasonic EEU-FC series parts specify 2000 Hrs @ 105°C compared to the original 3000 Hrs. This reflects different design specifications but remains suitable for general-purpose applications. For applications requiring extended lifetime, select ELXY250ELL181MJC5S (5000 Hrs) or equivalent extended-life alternatives.

Q: What does AEC-Q200 qualification mean?

A: AEC-Q200 is an automotive industry standard qualification for discrete semiconductors and passive components. Parts carrying this rating (Panasonic EEU-FC series, Chemi-Con ELXY and ELXV series) meet stringent automotive reliability and quality requirements, making them suitable for mission-critical applications.

Q: Are there physical dimension constraints I should consider?

A: Yes. The original part measures 0.315" diameter × 0.630" height. Some substitutes vary in height (0.453" to 0.650"). Verify clearance above the capacitor on the PCB and confirm that taller variants do not interfere with adjacent components or enclosure constraints.

Q: What is impedance and why does it vary among substitutes?

A: Impedance (measured in mOhms) affects ripple current handling and high-frequency performance. Lower impedance (EEU-FC1E181BJ at 117 mOhms) provides better ripple current performance compared to the original (220 mOhms). For applications with high ripple current requirements, select substitutes with lower impedance values.

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