K121J15C0GF53L2 Equivalent & Substitute Parts

Part Overview

The K121J15C0GF53L2 is a 120 pF ceramic capacitor manufactured by Vishay Beyschlag/Draloric/BC Components in the Mono-Kap™ K series. This radial through-hole component operates at 50V with C0G/NP0 temperature coefficient and ±5% tolerance, suitable for general-purpose applications across the -55°C to 125°C temperature range. The part is currently active in production. Equivalent and substitute parts are identified to support component sourcing flexibility, inventory management, and design continuity when the primary part becomes unavailable.

Key Parameters

Parameter	Value
Capacitance	120 pF
Tolerance	±5%
Voltage - Rated	50V
Temperature Coefficient	C0G, NP0
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Radial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the K121J15C0GF53L2 is determined by strict equivalence across the following critical parameters: capacitance value (120 pF), tolerance (±5%), rated voltage (50V), temperature coefficient (C0G/NP0), operating temperature range (-55°C to 125°C), mounting type (through-hole radial), and regulatory compliance (ROHS3). Physical dimensions and lead spacing may vary within acceptable mechanical tolerances for through-hole radial packages. All identified substitutes maintain identical electrical specifications and compliance certifications, ensuring functional interchangeability in general-purpose applications.

Parameter Comparison

Parameter	K121J15C0GF53L2 (Vishay)	FK18C0G1H121JN020 (TDK)	FK28C0G1H121JN000 (TDK)	RDE5C1H121J0K1H03B (Murata)
Manufacturer	Vishay Beyschlag/Draloric/BC Components	TDK Corporation	TDK Corporation	Murata Electronics
Capacitance	120 pF	120 pF	120 pF	120 pF
Tolerance	±5%	±5%	±5%	±5%
Voltage - Rated	50V	50V	50V	50V
Temperature Coefficient	C0G, NP0	C0G, NP0	C0G, NP0	C0G, NP0
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial
Size / Dimension	0.157" L x 0.102" W (4.00mm x 2.60mm)	0.157" L x 0.098" W (4.00mm x 2.50mm)	0.157" L x 0.098" W (4.00mm x 2.50mm)	0.157" L x 0.098" W (4.00mm x 2.50mm)
Height - Seated (Max)	0.220" (5.60mm)	0.217" (5.50mm)	0.217" (5.50mm)	0.236" (6.00mm)
Lead Spacing	0.098" (2.50mm)	0.098" (2.50mm)	0.197" (5.00mm)	0.197" (5.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Not For New Designs	Not For New Designs	Active

Engineering Selection Recommendations

FK18C0G1H121JN020 (TDK) is electrically equivalent to K121J15C0GF53L2 with identical capacitance, tolerance, voltage rating, and temperature coefficient. This part carries ROHS3 compliance and is suitable for direct substitution in existing designs. However, TDK has designated this part as "Not For New Designs," indicating it is in end-of-life status. Lead spacing matches the primary part at 0.098" (2.50mm), ensuring mechanical compatibility.

FK28C0G1H121JN000 (TDK) maintains full electrical equivalence but features a different lead spacing of 0.197" (5.00mm), requiring PCB layout verification before implementation. This part is also designated "Not For New Designs" and carries ROHS3 compliance.

RDE5C1H121J0K1H03B (Murata) is electrically equivalent with identical electrical specifications and ROHS3 compliance. This part maintains active product status, making it the preferred choice for new designs requiring a long-term supply commitment. Lead spacing is 0.197" (5.00mm), requiring PCB layout confirmation. Maximum seated height is 0.236" (6.00mm), slightly higher than the primary part.

For new designs, RDE5C1H121J0K1H03B is recommended due to active product status and assured long-term availability. For existing designs with 0.098" (2.50mm) lead spacing, FK18C0G1H121JN020 provides direct mechanical compatibility, though end-of-life status should be considered for long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can FK28C0G1H121JN000 be used as a direct replacement for K121J15C0GF53L2?

A: FK28C0G1H121JN000 is electrically equivalent but has different lead spacing (0.197" vs. 0.098"). Direct PCB substitution is not possible without layout modification. Verify hole spacing on your PCB before selection.

Q: What is the difference between the TDK FK series substitutes?

A: FK18C0G1H121JN020 has 0.098" (2.50mm) lead spacing, matching the primary part. FK28C0G1H121JN000 has 0.197" (5.00mm) lead spacing. Both are electrically identical but mechanically different. Select based on your PCB hole pattern.

Q: Why is RDE5C1H121J0K1H03B recommended for new designs?

A: RDE5C1H121J0K1H03B maintains active product status with Murata, ensuring continued availability and supply chain stability. TDK's FK series parts are designated "Not For New Designs," indicating end-of-life trajectory.

Q: Are all substitutes ROHS3 compliant?

A: Yes. K121J15C0GF53L2, FK18C0G1H121JN020, FK28C0G1H121JN000, and RDE5C1H121J0K1H03B are all ROHS3 compliant.

Q: What is the maximum height difference among these parts?

A: Maximum seated heights range from 0.217" (5.50mm) for TDK parts to 0.236" (6.00mm) for the Murata part. The primary Vishay part is 0.220" (5.60mm). Verify clearance in your application before selection.

Q: Can I use RDE5C1H121J0K1H03B in a design originally specified for K121J15C0GF53L2?

A: Electrical substitution is valid. However, verify PCB hole spacing (0.197" vs. 0.098") and component height clearance (0.236" vs. 0.220") before implementation.

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