CL43B334KBFNNNE Equivalent & Substitute Parts Reference

Part Overview

The CL43B334KBFNNNE is a 0.33 µF ±10% 50V ceramic capacitor manufactured by Samsung Electro-Mechanics in the 1812 (4532 Metric) package. This surface mount multilayer ceramic capacitor (MLCC) with X7R temperature coefficient is designed for general purpose applications and operates across the temperature range of -55°C to 125°C. The part is ROHS3 compliant, REACH unaffected, and carries MSL 1 (unlimited moisture sensitivity level) rating. Equivalent and substitute parts are identified when manufacturers discontinue production, inventory becomes unavailable, or design requirements necessitate alternative electrical or mechanical specifications within the same package footprint.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	0.33 µF	Must remain constant for direct equivalents
Tolerance	±10%	Defines acceptable capacitance variation; tighter tolerances (±5%) represent upgrades
Voltage Rating	50V	Minimum voltage requirement; higher ratings are upgrades
Temperature Coefficient	X7R	Must match for equivalent substitution
Package / Case	1812 (4532 Metric)	Physical footprint; must match for PCB compatibility
Operating Temperature Range	-55°C to 125°C	Must meet or exceed application requirements
Mounting Type	Surface Mount, MLCC	Must remain surface mount for automated assembly compatibility
RoHS Status	ROHS3 Compliant	Regulatory requirement; all substitutes must maintain compliance
MSL Rating	1 (Unlimited)	Moisture sensitivity; substitutes must meet or exceed this rating

Substitute Part Grouping Explanation

Substitute parts for the CL43B334KBFNNNE are categorized into two groups based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications (0.33 µF, ±10%, 50V, X7R) and physical package dimensions (1812/4532 Metric). These parts are interchangeable without circuit redesign:

C1812C334K5RAC7800 (KEMET)
KGM43AR71H334KV (KYOCERA AVX)

Upgrade Substitutes modify one or more electrical parameters while maintaining the same package footprint and core functionality. These parts are suitable when design requirements permit enhanced performance characteristics:

Tolerance upgrades (±5% instead of ±10%)
Voltage rating upgrades (100V or 250V instead of 50V)

All substitute parts maintain X7R temperature coefficient, 1812 (4532 Metric) package, surface mount configuration, ROHS3 compliance, and MSL 1 rating. Operating temperature range remains -55°C to 125°C across all substitutes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Tolerance	Voltage Rating	Temperature Coefficient	Package	Thickness (Max)	Inventory Status
CL43B334KBFNNNE	Samsung Electro-Mechanics	0.33 µF	±10%	50V	X7R	1812 (4532 Metric)	0.057" (1.45mm)	974 Pcs
C1812C334K5RAC7800	KEMET	0.33 µF	±10%	50V	X7R	1812 (4532 Metric)	0.043" (1.10mm)	19400 Pcs
KGM43AR71H334KV	KYOCERA AVX	0.33 µF	±10%	50V	X7R	1812 (4532 Metric)	0.055" (1.40mm)	6630 Pcs
C1812C334J5RAC7800	KEMET	0.33 µF	±5%	50V	X7R	1812 (4532 Metric)	0.043" (1.10mm)	4036 Pcs
C1812C334JARAC7800	KEMET	0.33 µF	±5%	250V	X7R	1812 (4532 Metric)	0.065" (1.65mm)	1792 Pcs
C1812C334K1RAC7800	KEMET	0.33 µF	±10%	100V	X7R	1812 (4532 Metric)	0.065" (1.65mm)	2400 Pcs
C1812C334KARAC7800	KEMET	0.33 µF	±10%	250V	X7R	1812 (4532 Metric)	0.065" (1.65mm)	14322 Pcs
KGM43AR71H334JV	KYOCERA AVX	0.33 µF	±5%	50V	X7R	1812 (4532 Metric)	0.055" (1.40mm)	2378 Pcs
KGM43BR72A334JV	KYOCERA AVX	0.33 µF	±5%	100V	X7R	1812 (4532 Metric)	0.057" (1.45mm)	925 Pcs
KGM43BR72A334KV	KYOCERA AVX	0.33 µF	±10%	100V	X7R	1812 (4532 Metric)	0.057" (1.45mm)	1157 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

Select C1812C334K5RAC7800 (KEMET) or KGM43AR71H334KV (KYOCERA AVX) when the original CL43B334KBFNNNE is unavailable. Both parts maintain 0.33 µF ±10% 50V X7R specifications with identical electrical performance. C1812C334K5RAC7800 offers significantly higher inventory availability (19400 pcs) and reduced thickness (0.043" vs 0.057"), providing potential PCB assembly advantages. KGM43AR71H334KV maintains thickness closer to the original specification (0.055" vs 0.057") and carries 6630 pcs in stock.

For Tolerance Upgrade (±5% Specification):

C1812C334J5RAC7800 (KEMET) or KGM43AR71H334JV (KYOCERA AVX) provide tighter capacitance tolerance (±5%) while maintaining 50V rating and X7R temperature coefficient. These upgrades are suitable for applications requiring improved capacitance accuracy without voltage rating changes. Both parts are ROHS3 compliant and MSL 1 rated.

For Voltage Rating Upgrade:

C1812C334K1RAC7800 (100V, ±10%) or C1812C334KARAC7800 (250V, ±10%) provide enhanced voltage headroom for the same 0.33 µF capacitance. These upgrades are appropriate for circuits operating at higher supply voltages or requiring increased safety margins. C1812C334KARAC7800 offers the highest inventory (14322 pcs) among upgrade options.

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, EAR99 ECCN classification, and MSL 1 moisture sensitivity rating. Operating temperature range remains -55°C to 125°C across all options.

Frequently Asked Questions (FAQ)

Q: Can I use C1812C334K5RAC7800 as a direct replacement for CL43B334KBFNNNE?

A: Yes. Both parts specify 0.33 µF ±10% 50V X7R in 1812 (4532 Metric) package with identical electrical performance. The KEMET part offers higher inventory availability and slightly reduced thickness (0.043" vs 0.057"), which may provide assembly benefits without affecting electrical function.

Q: What is the difference between direct equivalents and upgrade substitutes?

A: Direct equivalents (C1812C334K5RAC7800, KGM43AR71H334KV) maintain all electrical specifications identical to the original part. Upgrade substitutes modify tolerance (±5% vs ±10%) or voltage rating (100V or 250V vs 50V) while preserving the 0.33 µF capacitance and 1812 package footprint. Upgrades are suitable when design requirements permit enhanced performance.

Q: Will a 100V or 250V rated capacitor work in a 50V circuit?

A: Yes. Higher voltage ratings are backward compatible in lower voltage applications. A 250V-rated capacitor operates correctly in a 50V circuit. However, higher voltage ratings typically result in increased thickness, which may affect PCB assembly clearances. Verify mechanical fit before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, matching the original CL43B334KBFNNNE specifications.

Q: What does ±10% tolerance mean compared to ±5%?

A: Tolerance specifies the acceptable deviation from the nominal 0.33 µF capacitance value. ±10% allows variation between 0.297 µF and 0.363 µF. ±5% provides tighter control between 0.3135 µF and 0.3465 µF. Tighter tolerance (±5%) is an upgrade suitable for precision applications.

Q: Can I substitute KGM43BR72A334JV (100V, ±5%) for the original 50V part?

A: Yes. The KGM43BR72A334JV provides both voltage upgrade (100V) and tolerance upgrade (±5%) while maintaining 0.33 µF capacitance and 1812 package. This substitution is suitable when design requirements permit enhanced specifications. Verify PCB clearance for the 0.057" thickness.

Q: What is the significance of X7R temperature coefficient?

A: X7R specifies the capacitance change across the operating temperature range (-55°C to 125°C). X7R maintains stable capacitance within ±15% across this range. All substitute parts maintain X7R specification, ensuring consistent performance across temperature extremes.

Q: Does package thickness affect PCB assembly?

A: Yes. Thickness variations (0.043" to 0.065") may impact reflow profile, component placement clearances, and underfill processes. C1812C334K5RAC7800 (0.043") offers the thinnest profile, while voltage-upgraded parts (0.065") are thicker. Verify mechanical compatibility with PCB design before substitution.

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