T491B475M025AT Equivalent & Substitute Parts

Part Overview

The T491B475M025AT is a 4.7 µF molded tantalum capacitor manufactured by KEMET, rated for 25 V with ±20% tolerance. This surface mount component operates across the temperature range of -55°C to 125°C and features an equivalent series resistance (ESR) of 1.5 Ohm. The part is packaged in 1411 (3528 Metric) form factor and is currently in active production status with RoHS3 compliance.

Equivalent and substitute parts are identified when alternative manufacturers or tolerance grades provide identical or superior electrical and mechanical characteristics within the same package specification. Substitute parts enable design flexibility, support supply chain continuity, and accommodate specific application requirements such as tighter tolerance specifications or alternative packaging formats.

Substiute Parts

T491B475M025AT

KEMETIn Stock: 2064T491B475M025AT Datasheet

Current PartRFQ

T491B475K025AH

KEMETIn Stock: 2954T491B475K025AH Datasheet

UpgradeRFQ

T491B475K025AT

KEMETIn Stock: 5905T491B475K025AT Datasheet

UpgradeRFQ

293D475X0025B2TE3

Vishay SpragueIn Stock: 15272293D475X0025B2TE3 Datasheet

DirectRFQ

TAJB475M025RNJ

KYOCERA AVXIn Stock: 4181TAJB475M025RNJ Datasheet

DirectRFQ

TPSB475M025Y1500

KYOCERA AVXIn Stock: 1770TPSB475M025Y1500 Datasheet

DirectRFQ

593D475X9025B2TE3

Vishay SpragueIn Stock: 6484593D475X9025B2TE3 Datasheet

UpgradeRFQ

TR3B475K025C1500

Vishay SpragueIn Stock: 5005TR3B475K025C1500 Datasheet

UpgradeRFQ

TAJB475K025RNJ

KYOCERA AVXIn Stock: 18520TAJB475K025RNJ Datasheet

SimilarRFQ

TPSB475M025R0900

KYOCERA AVXIn Stock: 3164TPSB475M025R0900 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution relationships for the T491B475M025AT are established based on the following critical parameters:

Primary Substitution Criteria:

• Capacitance value: 4.7 µF (exact match required)
• Voltage rating: 25 V (exact match required)
• Package / Case: 1411 (3528 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)

Secondary Compatibility Parameters:

• Tolerance: ±20% (main part specification) or ±10% (upgrade specification)
• ESR: 1.5 Ohm (main part specification) or equivalent lower values (performance enhancement)
• RoHS compliance: RoHS3 Compliant preferred
• Packaging format: Cut Tape (CT) & Digi-Reel® or Tape & Reel (TR)

Substitute parts are categorized as follows:

Upgrade Parts feature tighter tolerance (±10%) or equivalent ESR characteristics, providing improved performance while maintaining full electrical and mechanical compatibility.

Direct Equivalent Parts from alternative manufacturers (Vishay Sprague, KYOCERA AVX) maintain identical capacitance, voltage, tolerance, and package specifications with minor ESR variations within acceptable operating parameters.

Similar Parts offer the same core electrical specifications with alternative ESR values or packaging options, suitable for applications where ESR performance is not a limiting factor.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: T491B475K025AT

The T491B475K025AT is the preferred upgrade substitute for the T491B475M025AT. Both parts are manufactured by KEMET within the same T491 series and share identical electrical and mechanical specifications with the exception of tolerance grade. The T491B475K025AT provides ±10% tolerance compared to the ±20% tolerance of the main part, delivering improved capacitance accuracy. Both parts are RoHS3 compliant, feature identical ESR (1.5 Ohm), and are available in the same Cut Tape (CT) & Digi-Reel® packaging format. Inventory availability is significantly higher (5892 pcs vs. 2000 pcs), supporting production continuity.

Secondary Recommendation: TR3B475K025C1500 (Vishay Sprague)

The TR3B475K025C1500 from Vishay Sprague's TANTAMOUNT™ TR3 series provides ±10% tolerance with 1.5 Ohm ESR, matching the electrical performance of the primary recommendation. This part is RoHS3 compliant and available in Tape & Reel (TR) packaging. The Vishay Sprague alternative supports multi-source procurement strategies and offers substantial inventory availability (4926 pcs).

Tertiary Recommendation: 593D475X9025B2TE3 (Vishay Sprague)

The 593D475X9025B2TE3 from Vishay Sprague's TANTAMOUNT™ 593D series delivers ±10% tolerance with 1.5 Ohm ESR and RoHS3 compliance. This part is available in Tape & Reel (TR) format with high inventory levels (6397 pcs), supporting supply chain flexibility.

Direct Equivalent Options: TAJB475M025RNJ and TPSB475M025Y1500 (KYOCERA AVX)

Both KYOCERA AVX parts maintain the ±20% tolerance specification of the main part with identical 1.5 Ohm ESR and RoHS3 compliance. These parts are suitable for applications where tolerance specifications match the original design requirement. Both are available in Cut Tape (CT) & Digi-Reel® packaging.

Alternative with Lower ESR: TPSB475M025R0900 (KYOCERA AVX)

The TPSB475M025R0900 provides reduced ESR (900 mOhm) compared to the main part (1.5 Ohm), offering improved high-frequency performance characteristics. This part maintains ±20% tolerance and RoHS3 compliance. The lower ESR specification is suitable for applications requiring enhanced ripple current handling or reduced thermal dissipation.

Not Recommended: T491B475K025AH (KEMET)

The T491B475K025AH does not meet current RoHS compliance requirements (RoHS non-compliant status), limiting its use in applications subject to RoHS regulatory mandates.

Not Recommended: 293D475X0025B2TE3 (Vishay Sprague)

The 293D475X0025B2TE3 features elevated ESR (2.8 Ohm) compared to the main part specification (1.5 Ohm), resulting in higher equivalent series resistance and increased thermal dissipation. This part is suitable only for applications where ESR performance is not a design constraint.

Frequently Asked Questions (FAQ)

Q: Can T491B475K025AT be used as a direct replacement for T491B475M025AT?

A: Yes. The T491B475K025AT is a direct functional replacement with improved tolerance specification (±10% vs. ±20%). Both parts share identical capacitance (4.7 µF), voltage rating (25 V), ESR (1.5 Ohm), package (1411/3528 Metric), and operating temperature range (-55°C to 125°C). The primary difference is packaging format: T491B475K025AT is supplied in Tape & Reel (TR) while T491B475M025AT is supplied in Cut Tape (CT) & Digi-Reel®. Verify packaging compatibility with assembly equipment before implementation.

Q: What is the significance of tolerance differences between ±20% and ±10% specifications?

A: Tolerance specification defines the allowable deviation of actual capacitance value from the nominal rating. The ±20% tolerance of the main part permits capacitance values between 3.76 µF and 5.64 µF. The ±10% tolerance of upgrade parts restricts the range to 4.23 µF to 5.17 µF, providing tighter capacitance accuracy. Applications requiring precise capacitance values benefit from ±10% tolerance parts. Applications with wider tolerance margins function identically with either specification.

Q: Are KYOCERA AVX and Vishay Sprague parts fully compatible with KEMET specifications?

A: Yes, within the specified parameters. TAJB475M025RNJ, TPSB475M025Y1500, TAJB475K025RNJ, TPSB475M025R0900 (KYOCERA AVX) and 293D475X0025B2TE3, 593D475X9025B2TE3, TR3B475K025C1500 (Vishay Sprague) maintain identical capacitance, voltage rating, package dimensions, and operating temperature specifications. All recommended parts are RoHS3 compliant. Verify ESR and tolerance specifications against application requirements before selection.

Q: What does ESR (Equivalent Series Resistance) represent and why does it vary between manufacturers?

A: ESR is the internal resistance of the capacitor at operating frequency, measured in Ohms. Lower ESR values reduce ripple current dissipation and thermal generation. ESR variations between manufacturers result from different internal construction methods, lead frame designs, and manufacturing processes. The main part specifies 1.5 Ohm ESR. Vishay Sprague 293D475X0025B2TE3 features 2.8 Ohm ESR (higher dissipation), while KYOCERA AVX TPSB475M025R0900 features 900 mOhm ESR (lower dissipation). Select ESR specifications based on application thermal and ripple current requirements.

Q: Can parts specified for 1411 (3528 Metric) package be used interchangeably with 1210 package variants?

A: No. Package designation defines physical dimensions and mounting footprint. The 1411 (3528 Metric) package measures 0.138" L x 0.110" W (3.50mm x 2.80mm). Some substitute parts list both 1411 and 1210 package options in their specifications, indicating dual-package availability. Verify the specific package variant ordered matches the PCB footprint design. Incorrect package selection results in assembly incompatibility.

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

A: MSL defines the maximum time a component can be exposed to ambient moisture before soldering without requiring baking. MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions and requires no special handling or baking procedures prior to assembly. All recommended substitute parts carry MSL 1 classification, matching the main part specification.

Q: Are all recommended substitute parts RoHS3 compliant?

A: All recommended substitute parts carry RoHS3 Compliant status with the exception of T491B475K025AH (KEMET), which is RoHS non-compliant. For applications subject to RoHS regulatory requirements, select only parts explicitly marked as RoHS3 Compliant. The main part T491B475M025AT and all primary recommendations meet RoHS3 compliance.

Q: How do packaging formats (Cut Tape vs. Tape & Reel) affect component selection?

A: Packaging format determines the physical presentation and handling method during assembly. Cut Tape (CT) & Digi-Reel® format supplies components on tape with individual component spacing, suitable for manual or semi-automated assembly. Tape & Reel (TR) format supplies components on continuous reel tape, optimized for high-speed automated assembly equipment. Select packaging format based on assembly process capabilities. Both formats contain identical components; only the presentation differs.

Q: What inventory levels should be considered when selecting substitute parts?

A: Inventory availability supports production scheduling and supply chain continuity. The main part T491B475M025AT has 2000 pcs in stock. Recommended substitutes offer higher availability: T491B475K025AT (5892 pcs), 593D475X9025B2TE3 (6397 pcs), TAJB475K025RNJ (18434 pcs), and 293D475X0025B2TE3 (15242 pcs). Higher inventory levels reduce lead time risk and support larger production volumes. Verify current inventory status with supplier before finalizing procurement decisions.