ECA-2EM4R7BJ Equivalent & Substitute Parts

Part Overview

The ECA-2EM4R7BJ is a 4.7 µF, 250 V aluminum electrolytic capacitor in radial configuration manufactured by Panasonic Electronic Components. This through-hole component is rated for 2000 hours at 85°C and is designed for general-purpose applications. The part is currently active and in stock with 672 units available in Tape & Box packaging.

Equivalent and substitute parts are identified when electrical parameters (capacitance, voltage rating, tolerance, and thermal lifetime) and mechanical specifications (lead spacing, case size, and mounting type) align with application requirements. Substitutes may differ in packaging format, manufacturer, or enhanced performance characteristics while maintaining functional compatibility.

Key Parameters

Parameter	Value
Capacitance	4.7 µF
Voltage Rating	250 V
Tolerance	±20%
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature Range	-25°C ~ 85°C
Lead Spacing	0.138" (4.60mm)
Case Diameter	0.315" (8.00mm)
Height (Seated Max)	0.492" (12.50mm)
Mounting Type	Through Hole
Package Type	Radial, Can

Substitute Part Grouping Explanation

Substitution relationships are established based on the following criteria:

Direct Equivalents maintain identical electrical specifications (capacitance, voltage, tolerance, lifetime) and mechanical dimensions. Differences are limited to packaging format (Bulk vs. Tape & Box vs. Cut Tape).

Similar Parts share core electrical parameters but may have minor mechanical variations such as lead spacing or height, provided the differences do not affect PCB layout compatibility.

Upgrade Parts exceed the original specifications in voltage rating or operating temperature range while maintaining the same capacitance, tolerance, and physical footprint. These provide enhanced performance margins for the same application.

The following parameters determine substitution eligibility:

Capacitance value (must match: 4.7 µF)
Voltage rating (must equal or exceed: 250 V)
Tolerance (must match or be tighter: ±20%)
Lead spacing (must match or be compatible with PCB design)
Case diameter (must match: 0.315" / 8.00mm)
Mounting type (must remain: Through Hole, Radial)

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Height (Max)	Packaging	Product Status
ECA-2EM4R7BJ	Panasonic	4.7 µF	250 V	±20%	2000 Hrs @ 85°C	-25°C ~ 85°C	0.138" (4.60mm)	0.492" (12.50mm)	Tape & Box	Active
ECA-2EM4R7	Panasonic	4.7 µF	250 V	±20%	2000 Hrs @ 85°C	-25°C ~ 85°C	0.138" (4.60mm)	0.492" (12.50mm)	Bulk	Active
ECA-2EM4R7B	Panasonic	4.7 µF	250 V	±20%	2000 Hrs @ 85°C	-25°C ~ 85°C	0.197" (5.00mm)	0.492" (12.50mm)	Cut Tape	Active
UVR2E4R7MPD1TD	Nichicon	4.7 µF	250 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.138" (4.60mm)	0.512" (13.00mm)	Cut Tape	Not For New Designs
UVK2V4R7MPD1TD	Nichicon	4.7 µF	350 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.138" (4.60mm)	0.512" (13.00mm)	Cut Tape	Not For New Designs
UVC2G4R7MPD1TD	Nichicon	4.7 µF	400 V	±20%	2000 Hrs @ 105°C	-40°C ~ 105°C	0.138" (4.60mm)	0.512" (13.00mm)	Cut Tape	Active

Engineering Selection Recommendations

For Direct Replacement (Same Specifications):

ECA-2EM4R7 (Panasonic, Bulk packaging) is a direct electrical equivalent with identical voltage, capacitance, tolerance, and thermal rating. Selection depends on packaging requirements and procurement volume.
ECA-2EM4R7B (Panasonic, Cut Tape) maintains electrical equivalence but features a 0.197" (5.00mm) lead spacing compared to the original 0.138" (4.60mm). This part is suitable only if PCB layout accommodates the wider lead pitch.

For Enhanced Performance:

UVC2G4R7MPD1TD (Nichicon, 400 V, 2000 Hrs @ 105°C) provides upgraded voltage rating and higher temperature lifetime rating. This part is recommended for applications requiring improved thermal margin or higher voltage stress tolerance. Product status is Active, supporting long-term design continuity.

For Voltage Margin Applications:

UVK2V4R7MPD1TD (Nichicon, 350 V) offers intermediate voltage rating with extended operating temperature range (-40°C ~ 85°C). However, product status is "Not For New Designs," limiting suitability for new development.

For Legacy System Maintenance:

UVR2E4R7MPD1TD (Nichicon, 250 V) matches the original voltage specification with extended operating temperature range. Product status is "Not For New Designs," indicating this part is suitable for field replacement or legacy system support only.

All substitute parts maintain ROHS3 compliance and through-hole radial mounting configuration. Lead spacing and case height variations must be verified against PCB layout constraints before selection.

Frequently Asked Questions (FAQ)

Q: Can ECA-2EM4R7B be used as a direct replacement for ECA-2EM4R7BJ?

A: ECA-2EM4R7B is electrically equivalent but has a different lead spacing (0.197" vs. 0.138"). It can be used only if the PCB layout accommodates the wider 5.00mm lead pitch. Verify footprint compatibility before substitution.

Q: What is the difference between the Panasonic and Nichicon substitute parts?

A: Panasonic ECA-2EM series parts are direct electrical equivalents differing only in packaging. Nichicon UVR, UVK, and UVC series parts offer enhanced specifications: UVR2E4R7MPD1TD matches voltage but extends temperature range; UVK2V4R7MPD1TD increases voltage to 350 V; UVC2G4R7MPD1TD provides the highest voltage (400 V) and temperature rating (105°C).

Q: Why are some substitute parts marked "Not For New Designs"?

A: Parts designated "Not For New Designs" indicate the manufacturer is phasing out the product line. These parts remain available for existing inventory and field replacement but should not be selected for new product development. For new designs, choose parts with "Active" status such as ECA-2EM4R7 or UVC2G4R7MPD1TD.

Q: Can I use a 400 V rated capacitor (UVC2G4R7MPD1TD) in place of a 250 V rated capacitor (ECA-2EM4R7BJ)?

A: Yes. A higher voltage rating provides additional safety margin and is electrically compatible. The 400 V part also offers improved thermal performance (2000 Hrs @ 105°C vs. 2000 Hrs @ 85°C), making it suitable for applications with elevated ambient temperatures or thermal stress.

Q: Are there packaging differences that affect assembly?

A: Yes. ECA-2EM4R7BJ is supplied in Tape & Box format. ECA-2EM4R7 is Bulk packaging. Nichicon substitutes are Cut Tape. Verify that your assembly process and procurement workflow support the selected packaging format.

Q: What is the impact of lead spacing differences on PCB design?

A: Lead spacing determines the distance between solder pads on the PCB. ECA-2EM4R7BJ and most substitutes use 0.138" (4.60mm) spacing. ECA-2EM4R7B uses 0.197" (5.00mm). Mismatched spacing will result in assembly failure. Confirm PCB footprint before selecting a substitute with different lead spacing.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed—ECA-2EM4R7BJ, ECA-2EM4R7, ECA-2EM4R7B, UVR2E4R7MPD1TD, UVK2V4R7MPD1TD, and UVC2G4R7MPD1TD—are ROHS3 compliant and suitable for applications requiring RoHS certification.

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