T491C336K010ZTAC00 Equivalent & Substitute Parts

Part Overview

The T491C336K010ZTAC00 is a 33 µF molded tantalum capacitor manufactured by KEMET, rated for 10 V operation in a 2312 (6032 Metric) surface mount package. This component is classified as obsolete, indicating discontinuation from active production. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this capacitor specification.

Key Parameters

Parameter	Value
Capacitance	33 µF
Tolerance	±10%
Voltage Rating	10 V
Package / Case	2312 (6032 Metric)
Type	Molded Tantalum
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Lifetime @ Temperature	2000 Hrs @ 125°C
Physical Dimensions	0.236" L x 0.126" W (6.00mm x 3.20mm)
Height - Seated (Max)	0.110" (2.80mm)
Manufacturer Size Code	C
Features	General Purpose
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the T491C336K010ZTAC00 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Capacitance: 33 µF (exact match required)
Tolerance: ±10% (exact match required)
Voltage Rating: 10 V (exact match required)
Package / Case: 2312 (6032 Metric) (exact match required)
Type: Molded Tantalum (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Lifetime @ Temperature: 2000 Hrs @ 125°C (exact match required)
Physical Dimensions: 0.236" L x 0.126" W / 6.00mm x 3.20mm (exact match required)
Height - Seated (Max): 0.110" (2.80mm) (exact match required)
Manufacturer Size Code: C (exact match required)

Secondary Consideration:

ESR (Equivalent Series Resistance): Acceptable variance within 1.5Ohm to 1.6Ohm range

All substitute parts listed below meet these criteria and are manufactured by KEMET within the T491 series. Substitutes differ only in packaging configuration (Tape & Reel), product status (Active vs. Obsolete), RoHS compliance certification, or internal traceability codes that do not affect electrical or mechanical performance.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage	Package	ESR (Ohm)	Product Status	RoHS Status	Inventory (Pcs)
T491C336K010ZTAC00	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Obsolete	ROHS3 Compliant	819
T491C336K010AT	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.6	Active	ROHS3 Compliant	47531
T491C336K010AH	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	RoHS non-compliant	812
T491C336K010AT2478	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	1094
T491C336K010AT4100	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	1145
T491C336K010AT4153	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	1043
T491C336K010AT4280	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	861
T491C336K010AT4539	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	784
T491C336K010AT7280	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	983
T491C336K010ATAU50	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	4200
T491C336K010ATAU507280	KEMET	33 µF	±10%	10 V	2312 (6032 Metric)	1.5	Active	ROHS3 Compliant	1126

Engineering Selection Recommendations

Primary Recommendation:

T491C336K010AT is the preferred substitute for T491C336K010ZTAC00. This part maintains full electrical and mechanical equivalence with the original specification while offering the following advantages:

Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance aligns with current regulatory requirements
Highest inventory level (47531 Pcs) provides immediate procurement availability
ESR of 1.6Ohm remains within acceptable operational parameters for general purpose applications

Secondary Recommendations:

For applications requiring ROHS3 compliance with matching ESR (1.5Ohm):

T491C336K010AT7280: 983 Pcs in stock, ROHS3 compliant
T491C336K010ATAU50: 4200 Pcs in stock, ROHS3 compliant, highest secondary inventory
T491C336K010AT2478: 1094 Pcs in stock, ROHS3 compliant
T491C336K010AT4100: 1145 Pcs in stock, ROHS3 compliant
T491C336K010AT4153: 1043 Pcs in stock, ROHS3 compliant
T491C336K010AT4539: 784 Pcs in stock, ROHS3 compliant

Alternative for Non-Compliant Applications:

T491C336K010AH is electrically equivalent with 1.5Ohm ESR but carries RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not required.

All substitute parts are manufactured by KEMET within the T491 series and maintain identical electrical performance, thermal characteristics, and mechanical form factor as the original T491C336K010ZTAC00.

Frequently Asked Questions (FAQ)

Q: Can T491C336K010AT be used as a direct replacement for T491C336K010ZTAC00?

A: Yes. T491C336K010AT is a direct substitute. Both parts share identical capacitance (33 µF), tolerance (±10%), voltage rating (10 V), package (2312/6032 Metric), operating temperature range (-55°C ~ 125°C), and lifetime specification (2000 Hrs @ 125°C). The ESR difference (1.6Ohm vs. 1.5Ohm) is within acceptable operational variance for general purpose applications.

Q: What is the difference between the various T491C336K010AT variants (AT2478, AT4100, AT4153, AT4280, AT4539, AT7280, ATAU50, ATAU507280)?

A: All variants are electrically and mechanically identical. The suffix codes represent internal KEMET traceability, manufacturing lot identification, or packaging configuration designations. These codes do not affect electrical performance, mechanical compatibility, or thermal characteristics. Selection among variants may be based on inventory availability or procurement lead time requirements.

Q: Is RoHS compliance a critical factor in selecting a substitute?

A: RoHS compliance status depends on application requirements and regulatory jurisdiction. T491C336K010AT and most variants are ROHS3 compliant, meeting current EU and international environmental standards. T491C336K010AH is RoHS non-compliant and should be selected only when regulatory exemptions apply or compliance is not required.

Q: Does the ESR difference between 1.5Ohm and 1.6Ohm affect circuit performance?

A: The ESR variance (1.5Ohm to 1.6Ohm) is negligible for general purpose applications. Both values fall within the same performance class for 33 µF, 10 V molded tantalum capacitors. Circuit-level impact is minimal unless the design operates at the thermal or frequency limits of the specification. Consult application-specific circuit analysis if ESR sensitivity is critical.

Q: Can I mix different substitute part numbers in the same assembly?

A: Yes. All substitute parts listed are electrically and mechanically equivalent. Mixing different part numbers within the same assembly does not introduce compatibility issues, as they share identical electrical characteristics, package dimensions, and thermal performance.

Q: What is the significance of the 2312 (6032 Metric) package designation?

A: The 2312 designation refers to the imperial package size (0.236" L x 0.126" W), while 6032 Metric is the equivalent metric dimension (6.00mm x 3.20mm). Both designations describe the same physical package. The maximum seated height is 0.110" (2.80mm), which is critical for PCB layout and component clearance verification.

Q: Are there any cross-manufacturer substitutes available?

A: The provided substitute list includes only KEMET T491 series parts. Cross-manufacturer alternatives (such as AVX, Vishay, or Panasonic equivalents) are not included in this reference. If cross-manufacturer substitution is required, consult manufacturer datasheets to verify electrical, mechanical, and thermal equivalence.

Q: What is Moisture Sensitivity Level (MSL) 1, and why is it important?

A: MSL 1 indicates unlimited moisture sensitivity, meaning the component does not require special moisture control during storage, handling, or assembly. This simplifies supply chain management and reduces storage costs compared to higher MSL ratings.

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