T491D157M010AS Equivalent & Substitute Parts

Part Overview

The T491D157M010AS is a 150 µF molded tantalum capacitor rated at 10 V in a 2917 (7343 Metric) surface mount package, manufactured by KEMET. This part is classified as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning. The component features a 700 mOhm equivalent series resistance (ESR) and operates across a temperature range of -55°C to 125°C. Substitution is necessary to maintain supply chain reliability and access to active product alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

T491D157M010AS

KEMETIn Stock: 2429T491D157M010AS Datasheet

Current PartRFQ

T491D157M010AT

KEMETIn Stock: 2438T491D157M010AT Datasheet

DirectRFQ

293D157X0010D2TE3

Vishay SpragueIn Stock: 5487293D157X0010D2TE3 Datasheet

SimilarRFQ

TPSD157M010H0100

KYOCERA AVXIn Stock: 1094TPSD157M010H0100 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491D157M010AS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 150 µF (exact match required)
• Voltage Rating: 10 V (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Variation permitted within component design specifications
• Product Status: Active status preferred for new designs; obsolete status acceptable for legacy system maintenance
• RoHS Compliance: Variation permitted based on application requirements
• Packaging Format: Cut Tape (CT), Digi-Reel®, or Tape & Reel (TR) formats are interchangeable for procurement purposes

Three substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

T491D157M010AT (KEMET)

This part is the direct manufacturer equivalent from KEMET. It maintains identical electrical specifications (150 µF, 10 V, ±20%, 700 mOhm ESR) and mechanical dimensions to the main part. The T491D157M010AT is classified as active product status, ensuring ongoing availability and supply chain support. It achieves ROHS3 compliance, meeting modern regulatory requirements. This part is available in Cut Tape (CT) and Digi-Reel® packaging formats. Selection of T491D157M010AT is appropriate for new designs and legacy system replacements where KEMET sourcing is preferred.

293D157X0010D2TE3 (Vishay Sprague)

This part is manufactured by Vishay Sprague under the TANTAMOUNT™ series and meets all mandatory electrical and mechanical parameters. The ESR specification is 600 mOhm, which is lower than the main part's 700 mOhm. This represents an allowable variation within component design specifications and does not compromise circuit compatibility. The 293D157X0010D2TE3 is active product status with ROHS3 compliance. It is supplied in Tape & Reel (TR) packaging. Selection of this part is appropriate when Vishay Sprague sourcing is required or when lower ESR characteristics are beneficial to circuit performance.

TPSD157M010H0100 (KYOCERA AVX)

This part is manufactured by KYOCERA AVX under the TPS series and meets all mandatory electrical and mechanical parameters. The ESR specification is 100 mOhm, which is significantly lower than the main part's 700 mOhm. This represents an allowable variation and indicates superior high-frequency performance characteristics. The TPSD157M010H0100 is active product status. It is supplied in Tape & Reel (TR) packaging. Note that this part carries RoHS non-compliant status, matching the main part's compliance profile. Selection of this part is appropriate when KYOCERA AVX sourcing is required or when low ESR performance is a circuit design requirement.

Frequently Asked Questions (FAQ)

Q: Can T491D157M010AT be used as a direct replacement for T491D157M010AS?

A: Yes. T491D157M010AT is the active equivalent from KEMET with identical capacitance (150 µF), voltage rating (10 V), tolerance (±20%), ESR (700 mOhm), package (2917), and operating temperature range (-55°C to 125°C). The primary difference is product status (active versus obsolete) and improved RoHS3 compliance.

Q: What is the significance of ESR differences among the substitute parts?

A: ESR (Equivalent Series Resistance) affects high-frequency performance and ripple current handling. The main part specifies 700 mOhm. The 293D157X0010D2TE3 offers 600 mOhm, and the TPSD157M010H0100 offers 100 mOhm. Lower ESR values improve performance in high-frequency applications and reduce heat generation. All three values are within acceptable substitution parameters for this capacitor category.

Q: Are packaging format differences (Cut Tape, Digi-Reel®, Tape & Reel) significant for substitution?

A: Packaging format differences are procurement and handling considerations only. They do not affect electrical or mechanical compatibility. Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) formats contain identical components and are interchangeable for circuit design purposes. Format selection depends on assembly equipment and inventory management requirements.

Q: Does RoHS compliance status affect substitution eligibility?

A: RoHS compliance status is a regulatory and application-specific consideration. The main part (T491D157M010AS) is RoHS non-compliant. Substitute parts T491D157M010AT and 293D157X0010D2TE3 are ROHS3 compliant, while TPSD157M010H0100 is RoHS non-compliant. Selection depends on end-application regulatory requirements. For new designs targeting RoHS compliance, T491D157M010AT or 293D157X0010D2TE3 are appropriate. For legacy systems matching the original compliance profile, TPSD157M010H0100 is suitable.

Q: Can these substitute parts be used interchangeably in the same circuit board design?

A: Yes, all three substitute parts are mechanically and electrically compatible for circuit board designs. They share identical capacitance, voltage rating, tolerance, package dimensions, and operating temperature range. Differences in ESR and RoHS compliance do not prevent interchangeability. However, circuit performance may vary slightly due to ESR differences, particularly in high-frequency or high-ripple-current applications.

Q: What is the Moisture Sensitivity Level (MSL) significance?

A: All parts, including the main part and substitutes, carry MSL 1 (Unlimited) rating. This indicates no moisture sensitivity restrictions and no special storage or handling requirements. Parts can be stored and handled under standard conditions without moisture-related degradation concerns.

Q: Is the 2917 (7343 Metric) package size identical across all parts?

A: Yes. All parts maintain identical package dimensions: 0.287" L x 0.169" W (7.30 mm x 4.30 mm) with maximum seated height of 0.122" (3.10 mm). Physical compatibility with printed circuit board layouts is guaranteed across all substitute parts.