DMT1S33K-F Equivalent & Substitute Parts

Part Overview

The DMT1S33K-F is a 0.033 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 100V DC voltage rating and ±10% tolerance. This radial through-hole component utilizes polyester metallized dielectric technology and operates across a temperature range of -55°C to 125°C. The part is currently active in production with 787 units in stock.

Substitute parts become necessary when design requirements demand higher voltage ratings, improved tolerance specifications, or when the primary part reaches end-of-life status. The substitute options listed maintain the same capacitance value and mounting configuration while offering enhanced electrical performance characteristics.

Key Parameters

Parameter	DMT1S33K-F
Capacitance	0.033 µF
Tolerance	±10%
Voltage Rating - DC	100V
Voltage Rating - AC	65V
Dielectric Material	Polyester, Metallized
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Radial
Lead Spacing	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DMT1S33K-F is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Capacitance value: 0.033 µF (exact match required)
Mounting type: Through Hole (exact match required)
Package configuration: Radial (exact match required)
Lead spacing: 0.394" to 0.402" (10.00mm to 10.20mm acceptable range)
Termination: PC Pins (exact match required)

Allowable Upgrade Parameters:

Voltage rating (DC): Equal to or greater than 100V
Voltage rating (AC): Equal to or greater than 65V
Tolerance: Equal to or tighter than ±10%
Operating temperature: Equal to or exceeding -55°C ~ 125°C range
Dielectric material: Polyester-based metallized film

The substitute parts listed below meet all mandatory compatibility criteria and offer equal or superior electrical performance in voltage rating and/or tolerance specifications.

Parameter Comparison

Parameter	DMT1S33K-F	160333K250C-F	B32521C3333J000	B32521C6333J	B32521C6333K
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	EPCOS - TDK Electronics	EPCOS - TDK Electronics	EPCOS - TDK Electronics
Capacitance	0.033 µF	0.033 µF	0.033 µF	0.033 µF	0.033 µF
Tolerance	±10%	±10%	±5%	±5%	±10%
Voltage Rating - DC	100V	250V	250V	400V	400V
Voltage Rating - AC	65V	160V	160V	200V	200V
Dielectric Material	Polyester, Metallized	Polyester, Metallized	Polyester, PET, Metallized - Stacked	Polyester, PET, Metallized - Stacked	Polyester, PET, Metallized - Stacked
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial
Lead Spacing	0.402" (10.20mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)
Termination	PC Pins	PC Pins	PC Pins	PC Pins	PC Pins
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Not For New Designs	Not For New Designs

Engineering Selection Recommendations

160333K250C-F (Cornell Dubilier Electronics)

This substitute provides a 250V DC upgrade from the original 100V rating while maintaining the same ±10% tolerance and radial through-hole configuration. The part is currently active in production. The operating temperature range is reduced to -55°C ~ 105°C, which is a limitation compared to the original specification. Physical dimensions are slightly smaller. This option is suitable for applications requiring higher voltage margin without tolerance improvement.

B32521C3333J000 (EPCOS - TDK Electronics)

This substitute offers both voltage upgrade to 250V DC and tolerance improvement to ±5%. The operating temperature range matches the original at -55°C ~ 125°C. The part carries AEC-Q200 automotive qualification and is currently active in production. This option provides the most balanced upgrade path with improved tolerance and maintained temperature performance.

B32521C6333J (EPCOS - TDK Electronics)

This substitute provides the highest voltage rating at 400V DC with ±5% tolerance. However, this part is marked as "Not For New Designs," indicating it is in obsolescence phase. The operating temperature range is -55°C ~ 125°C. This option should be avoided for new design implementations.

B32521C6333K (EPCOS - TDK Electronics)

This substitute offers 400V DC voltage rating with ±10% tolerance matching the original. The operating temperature range is -55°C ~ 125°C. This part is marked as "Not For New Designs," indicating obsolescence status. This option should be avoided for new design implementations.

For new designs, B32521C3333J000 is the recommended substitute due to active product status, improved tolerance specification, and maintained operating temperature range. For existing designs requiring only voltage upgrade without tolerance improvement, 160333K250C-F is an acceptable alternative.

Frequently Asked Questions (FAQ)

Q: Can the DMT1S33K-F be directly replaced with any of these substitutes?

A: Direct replacement is possible only if the circuit design accommodates the physical dimension differences and voltage rating changes. All substitute parts maintain the same 0.033 µF capacitance, radial through-hole mounting, and PC pin termination. Lead spacing differences of 0.008" (0.20mm) between the original and substitutes are within typical PCB tolerance for through-hole components.

Q: What is the significance of the "Not For New Designs" status on B32521C6333J and B32521C6333K?

A: Parts marked "Not For New Designs" are in obsolescence phase and should not be selected for new circuit designs. These parts may have limited availability and extended lead times. They are listed as substitutes only for legacy system maintenance and repair applications.

Q: How does tolerance affect component selection?

A: Tolerance specifies the allowable deviation from the nominal capacitance value. The original DMT1S33K-F has ±10% tolerance, meaning the actual capacitance can range from 0.0297 µF to 0.0363 µF. Substitute B32521C3333J000 offers ±5% tolerance, providing tighter capacitance control. Tighter tolerance is beneficial in precision filtering and timing applications but is not required for general-purpose applications.

Q: Are there physical size constraints when substituting these parts?

A: Yes. The original DMT1S33K-F measures 0.559" L x 0.248" W with a maximum seated height of 0.444". Substitute parts measure 0.512" L x 0.157" W with maximum seated heights ranging from 0.276" to 0.374". These smaller dimensions are generally compatible with existing PCB layouts, but clearance verification is necessary for densely populated boards.

Q: What is the impact of the reduced operating temperature range in 160333K250C-F?

A: The 160333K250C-F operates from -55°C to 105°C, compared to the original -55°C to 125°C. This 20°C reduction in maximum operating temperature may be significant for applications in high-temperature environments or equipment with internal heat generation. Verify that the application's maximum operating temperature does not exceed 105°C before selecting this substitute.

Q: Can these substitutes be used interchangeably in automotive applications?

A: B32521C3333J000 carries AEC-Q200 automotive qualification, making it suitable for automotive applications. The other substitutes do not list automotive qualifications. If the original application is automotive-qualified, B32521C3333J000 is the appropriate substitute choice.

Q: What does "Polyester, Metallized" versus "Polyester, PET, Metallized - Stacked" mean?

A: Both are polyester film capacitors with metallized electrodes. The "Stacked" configuration in the EPCOS parts indicates multiple film layers are stacked together, which can provide improved performance characteristics. Both types are functionally compatible for general-purpose applications, but the stacked construction may offer better frequency response and lower ESR in some applications.

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