ECQ-E1123KF Equivalent & Substitute Parts

Part Overview

The ECQ-E1123KF is a 0.012 µF film capacitor manufactured by Panasonic Electronic Components, rated for 100V DC operation with polyester metallized dielectric construction. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. The radial through-hole configuration and ±10% tolerance make this capacitor suitable for general-purpose filtering and coupling applications in electronic circuits.

Key Parameters

Parameter	Value
Capacitance	0.012 µF
Tolerance	±10%
Voltage Rating - DC	100V
Dielectric Material	Polyester, Metallized
Mounting Type	Through Hole
Package / Case	Radial
Operating Temperature Range	-40°C ~ 105°C
Lead Spacing	0.197" (5.00mm)
Termination	PC Pins

Substitute Part Grouping Explanation

Substitution of the ECQ-E1123KF is determined by strict equivalence across the following critical parameters:

Capacitance Value: 0.012 µF (exact match required)
Tolerance: ±10% (electrical performance specification)
Voltage Rating - DC: 100V minimum (safety and reliability requirement)
Dielectric Material: Polyester, Metallized (electrical characteristics and stability)
Mounting Type: Through Hole (assembly compatibility)
Package / Case: Radial (form factor and PCB layout compatibility)
Lead Spacing: 5.00mm nominal (PCB hole pattern compatibility)
Termination: PC Pins (soldering interface compatibility)

The BFC237021123 from Vishay Beyschlag/Draloric/BC Components meets all substitution criteria for the ECQ-E1123KF within the MKT370 series.

Parameter Comparison

Parameter	ECQ-E1123KF (Panasonic)	BFC237021123 (Vishay)	Compatibility
Capacitance	0.012 µF	0.012 µF	Equivalent
Tolerance	±10%	±10%	Equivalent
Voltage Rating - DC	100V	100V	Equivalent
Voltage Rating - AC	Not specified	63V	Substitute rated for AC operation
Dielectric Material	Polyester, Metallized	Polyester, Metallized	Equivalent
Operating Temperature Range	-40°C ~ 105°C	-55°C ~ 105°C	Substitute has extended low-temperature range
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Radial	Radial	Equivalent
Size / Dimension	0.307" L x 0.177" W (7.80mm x 4.50mm)	0.283" L x 0.098" W (7.20mm x 2.50mm)	Substitute is physically smaller
Height - Seated (Max)	0.339" (8.60mm)	0.256" (6.50mm)	Substitute has reduced height
Lead Spacing	0.197" (5.00mm)	0.200" (5.08mm)	Equivalent within standard tolerance
Termination	PC Pins	PC Pins	Equivalent
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current RoHS requirements

Engineering Selection Recommendations

The BFC237021123 is a direct functional equivalent for the obsolete ECQ-E1123KF. Selection of this substitute is supported by the following factors:

Electrical Equivalence: Identical capacitance, tolerance, and DC voltage rating ensure functional compatibility in circuit applications.
Product Status: The substitute is in active production, ensuring long-term availability and supply chain continuity.
Compliance: The BFC237021123 is ROHS3 compliant, meeting current regulatory requirements for new designs and manufacturing.
Physical Compatibility: Lead spacing of 5.08mm is within standard PCB hole pattern tolerance relative to the original 5.00mm specification. The reduced physical dimensions of the substitute provide layout flexibility without compromising electrical performance.
Temperature Performance: The extended operating temperature range of -55°C to 105°C provides enhanced reliability across broader environmental conditions compared to the original -40°C to 105°C specification.

Frequently Asked Questions (FAQ)

Q: Can the BFC237021123 be used as a direct replacement for the ECQ-E1123KF on existing PCBs?

A: Yes. The electrical specifications are equivalent, and the lead spacing of 5.08mm is compatible with standard 5.00mm hole patterns. The reduced physical dimensions of the substitute may provide additional clearance on the PCB.

Q: What is the significance of the AC voltage rating difference?

A: The ECQ-E1123KF does not specify an AC voltage rating, while the BFC237021123 is rated for 63V AC. For DC-only applications, this difference is not relevant. For circuits requiring AC operation, the 63V AC rating of the substitute must be evaluated against circuit requirements.

Q: Does the RoHS compliance difference affect substitution?

A: The BFC237021123 is ROHS3 compliant, while the ECQ-E1123KF is RoHS non-compliant. For new designs and manufacturing processes subject to RoHS regulations, the substitute provides compliance. For legacy systems, both parts are functionally equivalent.

Q: Are there any dimensional constraints that would prevent substitution?

A: The substitute is physically smaller in length, width, and height. This reduction in size is advantageous for space-constrained layouts. Lead spacing remains compatible with standard 5.00mm PCB hole patterns.

Q: What is the basis for substitution compatibility?

A: Substitution is based on matching capacitance value (0.012 µF), tolerance (±10%), DC voltage rating (100V), dielectric material (polyester metallized), mounting type (through hole), package configuration (radial), and termination style (PC pins).

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