T491E477M010AS Equivalent & Substitute Parts

Part Overview

The T491E477M010AS is a 470 µF molded tantalum capacitor rated at 10 V, manufactured by KEMET in the 2824 (7260 Metric) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -55°C to 125°C and features a 500 mOhm equivalent series resistance (ESR) with ±20% capacitance tolerance. Substitute parts must maintain electrical equivalence in capacitance, voltage rating, and physical package dimensions while meeting RoHS3 compliance requirements.

Key Parameters

Parameter	Value	Specification Basis
Capacitance	470 µF	Core electrical requirement
Voltage Rating	10 V	Maximum operating voltage
Tolerance	±20%	Acceptable capacitance deviation
Package / Case	2824 (7260 Metric)	Physical footprint compatibility
Mounting Type	Surface Mount	PCB assembly method
Operating Temperature	-55°C to 125°C	Environmental operating range
Type	Molded or Conformal Coated Tantalum	Construction technology
RoHS Status	ROHS3 Compliant	Regulatory requirement

Substitute Part Grouping Explanation

Substitution for the T491E477M010AS is determined by strict electrical and mechanical parameter matching. All substitute parts must satisfy the following criteria:

Mandatory Matching Parameters:

Capacitance: 470 µF (exact value)
Voltage Rating: 10 V (minimum)
Package / Case: 2824 (7260 Metric)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 125°C (minimum)
RoHS3 Compliance: Required

Acceptable Variations:

ESR (Equivalent Series Resistance): Substitutes may have lower ESR values without functional impact
Tantalum Type: Both molded and conformal coated constructions are acceptable
Moisture Sensitivity Level (MSL): Variations permitted based on application requirements
Product Status: Active parts are preferred over obsolete parts

The substitute parts identified below meet all mandatory parameters and are available in active production status.

Parameter Comparison

Parameter	T491E477M010AS (Main)	T491E477M010AT	594D477X0010R2T	595D477X0010R2T
Manufacturer	KEMET	KEMET	Vishay Sprague	Vishay Sprague
Capacitance	470 µF	470 µF	470 µF	470 µF
Tolerance	±20%	±20%	±20%	±20%
Voltage Rating	10 V	10 V	10 V	10 V
Type	Molded	Molded	Conformal Coated	Conformal Coated
ESR	500 mOhm	500 mOhm	45 mOhm	120 mOhm
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Package / Case	2824 (7260 Metric)	2824 (7260 Metric)	2824 (7260 Metric)	2824 (7260 Metric)
Size (L x W)	7.30 mm x 6.00 mm	7.30 mm x 6.00 mm	7.20 mm x 6.00 mm	7.20 mm x 6.00 mm
Height (Max)	3.80 mm	3.80 mm	3.75 mm	3.75 mm
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	2A (4 Weeks)	2A (4 Weeks)

Engineering Selection Recommendations

Primary Substitute: T491E477M010AT

The T491E477M010AT is the direct equivalent from KEMET. This part maintains identical electrical specifications (470 µF, 10 V, ±20% tolerance, 500 mOhm ESR) and physical dimensions to the obsolete T491E477M010AS. The T491E477M010AT is in active production status with 2000 hours lifetime rating at 125°C. Packaging is available in Tape & Reel (TR) format. This part is the recommended first choice for direct replacement due to manufacturer continuity and specification matching.

Secondary Substitutes: 594D477X0010R2T and 595D477X0010R2T

Both Vishay Sprague parts (594D and 595D series) meet all mandatory electrical and mechanical parameters. These conformal coated tantalum capacitors provide alternative sourcing from a different manufacturer. The 594D477X0010R2T features 45 mOhm ESR (lower than the original), while the 595D477X0010R2T features 120 mOhm ESR (lower than the original). Both parts are in active production status. Physical dimensions are slightly smaller (7.20 mm x 6.00 mm length versus 7.30 mm x 6.00 mm), which remains compatible with 2824 package footprints. MSL rating is 2A (4 Weeks) for both Vishay parts, compared to MSL 1 (Unlimited) for KEMET parts.

Selection Criteria:

Use T491E477M010AT for direct manufacturer continuity and unlimited moisture sensitivity handling
Use 594D477X0010R2T or 595D477X0010R2T when Vishay sourcing is preferred or when lower ESR performance is beneficial
All three substitutes are RoHS3 compliant and suitable for -55°C to 125°C operating environments
Conformal coated variants (Vishay parts) require MSL-compliant storage and handling procedures

Frequently Asked Questions (FAQ)

Q: Can T491E477M010AT be used as a direct replacement for T491E477M010AS?

A: Yes. The T491E477M010AT is electrically and mechanically equivalent. Both parts feature 470 µF capacitance, 10 V rating, ±20% tolerance, 500 mOhm ESR, and identical 2824 package dimensions. The primary difference is product status: T491E477M010AS is obsolete while T491E477M010AT is in active production.

Q: What is the difference between molded and conformal coated tantalum capacitors?

A: Molded tantalum capacitors (T491E series) feature a molded epoxy case. Conformal coated tantalum capacitors (594D and 595D series) have a conformal coating applied over the component. Both types meet the same electrical specifications for this application. Conformal coated parts typically have lower moisture sensitivity in certain environments but require MSL-compliant handling.

Q: Are the Vishay Sprague parts (594D and 595D) compatible with the original KEMET footprint?

A: Yes. Both Vishay parts use the 2824 (7260 Metric) package with dimensions of 7.20 mm x 6.00 mm (length x width) and 3.75 mm maximum height. The original KEMET part measures 7.30 mm x 6.00 mm x 3.80 mm. These minor dimensional differences remain within 2824 package compatibility and do not affect PCB layout or assembly.

Q: What does MSL rating mean, and why do the Vishay parts have MSL 2A instead of MSL 1?

A: MSL (Moisture Sensitivity Level) indicates how a component responds to moisture exposure during storage and handling. MSL 1 (Unlimited) means the part has unlimited shelf life without special moisture control. MSL 2A (4 Weeks) means the part must be used within 4 weeks of opening the moisture barrier bag. For applications requiring extended storage, the KEMET T491E477M010AT with MSL 1 is preferred.

Q: Can I use the 594D477X0010R2T (45 mOhm ESR) instead of the 595D477X0010R2T (120 mOhm ESR)?

A: Yes. Both parts meet the electrical requirements. The 594D477X0010R2T has lower ESR, which may provide performance benefits in applications sensitive to impedance characteristics. The 595D477X0010R2T has higher ESR but remains within acceptable parameters. Selection depends on specific circuit requirements and ESR performance criteria.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The T491E477M010AT, 594D477X0010R2T, and 595D477X0010R2T are all RoHS3 compliant, matching the compliance status of the original T491E477M010AS.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across -55°C to 125°C, matching the original part's temperature specification.

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