Equivalent & Substitute Parts for M30R334M5

Part Overview

The Cornell Dubilier Electronics M30R334M5 is a 0.33 µF ±20% 50V ceramic capacitor with X7R temperature coefficient in radial through-hole configuration. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers. The M30 series radial ceramic capacitor remains in general-purpose applications requiring stable capacitance across the -55°C to 125°C operating range. Active substitute parts maintain the same capacitance value, voltage rating, and mounting characteristics while offering improved availability and compliance status.

Key Parameters

Parameter	Value	Criticality for Substitution
Capacitance	0.33 µF	Critical - Must match exactly
Voltage Rating	50V	Critical - Must equal or exceed
Tolerance	±20%	Critical - Determines circuit performance margin
Temperature Coefficient	X7R	Critical - Defines capacitance stability
Operating Temperature Range	-55°C to 125°C	Critical - Environmental compatibility
Mounting Type	Through Hole Radial	Critical - PCB layout compatibility
Lead Spacing	0.200" (5.08mm)	Critical - PCB footprint compatibility
Package / Case	Radial	Critical - Physical form factor

Substitute Part Grouping Explanation

Substitution logic is based on the following mandatory parameters:

Primary Equivalence Criteria:

Capacitance value: 0.33 µF (exact match required)
Voltage rating: 50V minimum (equal or higher acceptable)
Temperature coefficient: X7R or C0G/NP0 (both acceptable for general-purpose applications)
Mounting type: Through-hole radial (exact match required)
Lead spacing: 0.200" (5.08mm) standard radial pitch
Operating temperature: -55°C to 125°C (minimum requirement)

Substitution Categories:

Direct Equivalent (Same Specifications):

K334M20X7RF53K5 (Vishay Beyschlag) - Identical electrical specifications, X7R dielectric, active status

Upgraded Substitutes (Enhanced Performance):

C330C334F5G5TA, C330C334G5G5TA, C330C334J5G5TA, C330C334K5G5TA (KEMET GoldMax 300 Comm C0G, 50V) - Tighter tolerance (±1% to ±10%), C0G/NP0 dielectric provides superior temperature stability, same voltage rating
C330C334F1G5TA, C330C334G1G5TA, C330C334J1G5TA, C330C334K1G5TA (KEMET GoldMax 300 Comm C0G, 100V) - Higher voltage rating (100V), tighter tolerance, C0G/NP0 dielectric
C330C334K1R5TA (KEMET GoldMax 300 Comm X7R, 100V) - Same X7R dielectric, higher voltage rating (100V), ±10% tolerance

All substitute parts maintain through-hole radial configuration with 0.200" lead spacing and -55°C to 125°C operating range.

Parameter Comparison

Parameter	M30R334M5 (CDE)	K334M20X7RF53K5 (Vishay)	C330C334K5G5TA (KEMET)	C330C334F5G5TA (KEMET)	C330C334K1R5TA (KEMET)
Capacitance	0.33 µF	0.33 µF	0.33 µF	0.33 µF	0.33 µF
Tolerance	±20%	±20%	±10%	±1%	±10%
Voltage Rating	50V	50V	50V	50V	100V
Temperature Coefficient	X7R	X7R	C0G/NP0	C0G/NP0	X7R
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial
Lead Spacing	0.200" (5.08mm)	0.197" (5.00mm)	0.200" (5.08mm)	0.200" (5.08mm)	0.200" (5.08mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

K334M20X7RF53K5 from Vishay Beyschlag provides direct electrical equivalence with X7R dielectric and ±20% tolerance matching the original M30R334M5. This part is active and ROHS3 compliant. Lead spacing is 0.197" (5.00mm) versus the original 0.200" (5.08mm), requiring verification of PCB footprint compatibility. This substitute is suitable for applications where X7R temperature stability and ±20% tolerance are acceptable.

For Enhanced Performance with Same Voltage Rating (50V):

KEMET GoldMax 300 Comm C0G series parts (C330C334K5G5TA, C330C334J5G5TA, C330C334G5G5TA, C330C334F5G5TA) offer tighter tolerance specifications (±10%, ±5%, ±2%, ±1% respectively) with C0G/NP0 dielectric providing superior temperature coefficient stability. All maintain 50V rating, through-hole radial configuration, and 0.200" lead spacing. These parts are active and ROHS3 compliant. Selection depends on tolerance requirements of the application circuit.

For Enhanced Performance with Higher Voltage Rating (100V):

KEMET GoldMax 300 Comm C0G series parts at 100V rating (C330C334K1G5TA, C330C334J1G5TA, C330C334G1G5TA, C330C334F1G5TA) provide increased voltage margin and tighter tolerances. C330C334K1R5TA maintains X7R dielectric with 100V rating and ±10% tolerance. All are active and ROHS3 compliant with standard 0.200" lead spacing. These upgrades are suitable for applications requiring improved reliability margins or stricter tolerance control.

Compliance Consideration:

The original M30R334M5 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for new designs and manufacturing.

Frequently Asked Questions (FAQ)

Q: Can K334M20X7RF53K5 be used as a direct replacement for M30R334M5?

A: K334M20X7RF53K5 matches the electrical specifications (0.33 µF, ±20%, 50V, X7R, -55°C to 125°C) and mounting type (through-hole radial). However, lead spacing is 0.197" (5.00mm) compared to the original 0.200" (5.08mm). Verify PCB footprint compatibility before substitution. The part is active and ROHS3 compliant.

Q: What is the difference between X7R and C0G/NP0 dielectrics?

A: X7R dielectric exhibits ±15% capacitance change across the -55°C to 125°C temperature range. C0G/NP0 dielectric provides superior stability with minimal capacitance change across temperature. For general-purpose applications, both are acceptable. C0G/NP0 is preferred for precision circuits requiring tighter tolerance control.

Q: Can I use a 100V rated capacitor in place of a 50V rated capacitor?

A: Yes. Voltage rating indicates the maximum safe operating voltage. A 100V rated capacitor can be used in a 50V application. However, physical dimensions may differ. Verify that C330C334K1G5TA, C330C334F1G5TA, or C330C334K1R5TA fit the PCB layout before substitution.

Q: What does ±20%, ±10%, ±5%, and ±1% tolerance mean?

A: Tolerance specifies the allowable deviation from the nominal capacitance value. ±20% means the actual capacitance can range from 0.264 µF to 0.396 µF. ±1% means the range is 0.3267 µF to 0.3333 µF. Tighter tolerance (lower percentage) is required for precision circuits; general-purpose applications accept wider tolerance.

Q: Are all substitute parts compatible with the original PCB layout?

A: All substitute parts maintain through-hole radial configuration with 0.200" lead spacing except K334M20X7RF53K5 (0.197" spacing). Physical dimensions vary slightly. Verify lead spacing and seated height against PCB hole pattern and clearance requirements before final selection.

Q: Why is the original M30R334M5 obsolete?

A: The M30 series from Cornell Dubilier Electronics has been discontinued. Active manufacturers including Vishay Beyschlag and KEMET produce functionally equivalent or upgraded alternatives with improved compliance status and availability.

Q: Which substitute part should I choose for a new design?

A: For new designs, select from active KEMET GoldMax 300 Comm series parts (C330C334K5G5TA or higher tolerance variants) or Vishay K334M20X7RF53K5. KEMET parts offer tighter tolerance options and higher voltage ratings. All are ROHS3 compliant and readily available.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided all parts meet the circuit's capacitance, voltage, and tolerance requirements. However, using identical part numbers ensures consistent performance and simplifies inventory management.

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