Equivalent & Substitute Parts for T491B225K020AS

Part Overview

The T491B225K020AS is a 2.2 µF molded tantalum capacitor rated at 20 V with ±10% tolerance, manufactured by KEMET in the 1411 (3528 Metric) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The part operates across a temperature range of -55°C to 125°C with an ESR of 3.5 Ohm and is suitable for general-purpose surface mount applications.

Key Parameters

Parameter	Value
Capacitance	2.2 µF
Tolerance	±10%
Voltage - Rated	20 V
Type	Molded Tantalum
ESR (Equivalent Series Resistance)	3.5 Ohm
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	1411 (3528 Metric)
Size / Dimension	0.138" L x 0.110" W (3.50mm x 2.80mm)
Height - Seated (Max)	0.083" (2.10mm)
Manufacturer Size Code	B
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the T491B225K020AS is determined by strict equivalence across the following critical parameters:

Capacitance: 2.2 µF (exact match required)
Voltage Rating: 20 V (exact match required)
Tolerance: ±10% (exact match required)
ESR: 3.5 Ohm (exact match required)
Package / Case: 1411 (3528 Metric) (exact match required)
Physical Dimensions: 0.138" L x 0.110" W; Height 0.083" max (exact match required)
Mounting Type: Surface Mount (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

All substitute parts listed maintain these electrical and mechanical specifications. Variations in operating temperature range, product status, RoHS compliance, and manufacturer series do not affect functional interchangeability within the specified parameter set.

Parameter Comparison

Parameter	T491B225K020AS (Main)	T491B225K020AT	TAJB225K020H	TH3B225K020F3500	TH3B225K020E3500	293D225X9020B2TE3
Manufacturer	KEMET	KEMET	KYOCERA AVX	Vishay Sprague	Vishay Sprague	Vishay Sprague
Series	T491	T491	TAJ	TH3	TH3	293D
Capacitance	2.2 µF	2.2 µF	2.2 µF	2.2 µF	2.2 µF	2.2 µF
Tolerance	±10%	±10%	±10%	±10%	±10%	±10%
Voltage - Rated	20 V	20 V	20 V	20 V	20 V	20 V
Type	Molded	Molded	Molded	Molded	Molded	Molded
ESR (Equivalent Series Resistance)	3.5 Ohm	3.5 Ohm	3.5 Ohm	3.5 Ohm	3.5 Ohm	3.5 Ohm
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)
Size / Dimension	0.138" L x 0.110" W (3.50mm x 2.80mm)	0.138" L x 0.110" W (3.50mm x 2.80mm)	0.138" L x 0.110" W (3.50mm x 2.80mm)	0.138" L x 0.110" W (3.50mm x 2.80mm)	0.138" L x 0.110" W (3.50mm x 2.80mm)	0.138" L x 0.110" W (3.50mm x 2.80mm)
Height - Seated (Max)	0.083" (2.10mm)	0.083" (2.10mm)	0.083" (2.10mm)	0.083" (2.10mm)	0.083" (2.10mm)	0.083" (2.11mm)
Manufacturer Size Code	B	B	B	B	B	B
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent - KEMET T491B225K020AT

The T491B225K020AT is the direct equivalent within the KEMET T491 series. This part maintains identical electrical and mechanical specifications to the obsolete T491B225K020AS. The primary distinction is product status: T491B225K020AT is active and carries ROHS3 compliance, whereas the original part is obsolete and RoHS non-compliant. This part is supplied in Tape & Reel (TR) packaging and includes a lifetime specification of 2000 Hrs @ 125°C.

Cross-Manufacturer Equivalents - Vishay Sprague TH3 Series

The TH3B225K020F3500 and TH3B225K020E3500 are active cross-manufacturer equivalents from Vishay Sprague. Both parts maintain all critical electrical and mechanical parameters. These components feature an extended operating temperature range of -55°C to 150°C and carry AEC-Q200 automotive qualification. Both are RoHS non-compliant and supplied in Tape & Reel packaging.

Cross-Manufacturer Equivalent - KYOCERA AVX TAJB225K020H

The TAJB225K020H from KYOCERA AVX is an active equivalent meeting all specified electrical and mechanical requirements. This part is RoHS non-compliant and maintains the standard operating temperature range of -55°C to 125°C.

RoHS3 Compliant Alternative - Vishay Sprague 293D225X9020B2TE3

The 293D225X9020B2TE3 is an active substitute from Vishay Sprague's TANTAMOUNT™ 293D series. This part achieves ROHS3 compliance while maintaining all critical electrical and mechanical specifications. The seated height is specified as 0.083" (2.11mm), representing a 0.01mm variance from the main part specification. This part is supplied in Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can T491B225K020AT be used as a direct replacement for T491B225K020AS?

A: Yes. The T491B225K020AT is electrically and mechanically equivalent to the T491B225K020AS across all critical parameters: 2.2 µF capacitance, 20 V rating, ±10% tolerance, 3.5 Ohm ESR, 1411 package, and identical physical dimensions. The primary difference is that T491B225K020AT is active and ROHS3 compliant.

Q: What is the difference between the KEMET and Vishay Sprague substitutes?

A: All substitutes maintain identical electrical specifications (2.2 µF, 20 V, ±10%, 3.5 Ohm ESR) and package dimensions (1411/3528 Metric). The Vishay Sprague TH3 series offers an extended operating temperature range (-55°C to 150°C versus -55°C to 125°C) and AEC-Q200 automotive qualification. The 293D series achieves ROHS3 compliance. Selection depends on application requirements for temperature range, compliance status, and manufacturer preference.

Q: Are all substitute parts available in the same packaging format?

A: The T491B225K020AT, TH3B225K020F3500, TH3B225K020E3500, and 293D225X9020B2TE3 are supplied in Tape & Reel (TR) packaging. The TAJB225K020H packaging format is not specified in the provided data. Confirm packaging requirements with your procurement specification before selection.

Q: Does the 0.01mm height variance in the 293D225X9020B2TE3 affect compatibility?

A: The 293D225X9020B2TE3 specifies a maximum seated height of 0.083" (2.11mm) compared to 0.083" (2.10mm) for the main part. This 0.01mm variance falls within typical PCB assembly tolerances and does not affect functional interchangeability or board-level compatibility.

Q: Which substitute offers the best compliance profile?

A: The T491B225K020AT and 293D225X9020B2TE3 both achieve ROHS3 compliance. The T491B225K020AT is the KEMET equivalent within the original series. The 293D225X9020B2TE3 provides ROHS3 compliance from an alternative manufacturer (Vishay Sprague).

Q: Can I use TH3B225K020F3500 or TH3B225K020E3500 in applications requiring RoHS compliance?

A: No. Both TH3B225K020F3500 and TH3B225K020E3500 are RoHS non-compliant. For RoHS-compliant applications, select T491B225K020AT or 293D225X9020B2TE3.

Q: What is the significance of AEC-Q200 qualification on the Vishay Sprague TH3 parts?

A: AEC-Q200 qualification indicates that TH3B225K020F3500 and TH3B225K020E3500 meet automotive-grade reliability standards. This certification is relevant only if your application requires automotive-qualified components. For general-purpose applications, this qualification does not affect functional interchangeability.

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