TE Connectivity 2-1879057-1 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 2-1879057-1 is a 22 µF molded tantalum capacitor rated for 35 V operation in a 2917 (7343 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing production and maintenance applications. The part features 700 mOhm equivalent series resistance and operates across the temperature range of -55°C to 125°C. Substitution is required to ensure continued availability and supply chain reliability for designs utilizing this capacitor specification.

Key Parameters

Parameter	Value
Capacitance	22 µF
Tolerance	±10%
Voltage Rating	35 V
Type	Molded Tantalum
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 125°C
ESR (Equivalent Series Resistance)	700 mOhm
Moisture Sensitivity Level	MSL 1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 2-1879057-1 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Capacitance: 22 µF (exact match required)
Voltage Rating: 35 V (exact match required)
Tolerance: ±10% (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)

Secondary Compatibility Parameters:

Type: Molded or Conformal Coated Tantalum (both acceptable for functional equivalence)
ESR: 700 mOhm baseline; lower ESR values (600 mOhm, 400 mOhm, 300 mOhm, 275 mOhm, 270 mOhm, 320 mOhm) are functionally compatible and represent performance improvements
Moisture Sensitivity Level: MSL 1 or MSL 2A acceptable
Physical Dimensions: Minor variations in height and length within package specification tolerance

Substitute parts are classified as either Direct Equivalents (matching all primary and secondary parameters) or Similar Alternatives (matching all primary criteria with variations in ESR or coating type that provide equivalent or superior performance).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Type	ESR	Package	Temp Range	Product Status	MSL
2-1879057-1	TE Connectivity	22 µF	35 V	±10%	Molded	700 mOhm	2917	-55°C to 125°C	Obsolete	MSL 1
F931V226KNC	KYOCERA AVX	22 µF	35 V	±10%	Molded	700 mOhm @ 100kHz	2917	-55°C to 125°C	Active	MSL 1
T491D226K035AT	KEMET	22 µF	35 V	±10%	Molded	700 mOhm	2917	-55°C to 125°C	Active	MSL 1
293D226X9035D2TE3	Vishay Sprague	22 µF	35 V	±10%	Molded	600 mOhm	2917	-55°C to 125°C	Active	MSL 1
293D226X9035E2TE3	Vishay Sprague	22 µF	35 V	±10%	Molded	600 mOhm	2917	-55°C to 125°C	Active	MSL 1
593D226X9035D2TE3	Vishay Sprague	22 µF	35 V	±10%	Molded	300 mOhm	2917	-55°C to 125°C	Active	MSL 1
593D226X9035E2TE3	Vishay Sprague	22 µF	35 V	±10%	Molded	275 mOhm	2917	-55°C to 125°C	Active	MSL 1
594D226X9035D2T	Vishay Sprague	22 µF	35 V	±10%	Conformal Coated	270 mOhm	2917	-55°C to 125°C	Active	MSL 2A
595D226X9035D2T	Vishay Sprague	22 µF	35 V	±10%	Conformal Coated	320 mOhm	2917	-55°C to 125°C	Active	MSL 2A
T491X226K035AT	KEMET	22 µF	35 V	±10%	Molded	700 mOhm	2917	-55°C to 125°C	Active	MSL 1
T494D226K035AT	KEMET	22 µF	35 V	±10%	Molded	400 mOhm	2917	-55°C to 125°C	Active	MSL 1

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility):

The following parts provide direct functional equivalence to the TE Connectivity 2-1879057-1 with active product status and full compliance certifications:

F931V226KNC (KYOCERA AVX): Active status, ROHS3 compliant, MSL 1, 700 mOhm ESR specification. Suitable for direct replacement in all applications.
T491D226K035AT (KEMET): Active status, ROHS3 compliant, MSL 1, 700 mOhm ESR specification. Suitable for direct replacement in all applications.
T491X226K035AT (KEMET): Active status, ROHS3 compliant, MSL 1, 700 mOhm ESR specification. Suitable for direct replacement in all applications.

Performance-Enhanced Alternatives (Lower ESR):

The following parts meet all primary substitution criteria with reduced ESR values, providing improved electrical performance characteristics:

293D226X9035D2TE3 (Vishay Sprague): Active status, ROHS3 compliant, MSL 1, 600 mOhm ESR. Lower ESR improves transient response and reduces thermal dissipation.
293D226X9035E2TE3 (Vishay Sprague): Active status, ROHS3 compliant, MSL 1, 600 mOhm ESR. Lower ESR improves transient response and reduces thermal dissipation.
593D226X9035D2TE3 (Vishay Sprague): Active status, ROHS3 compliant, MSL 1, 300 mOhm ESR. Significantly reduced ESR for applications requiring superior high-frequency performance.
593D226X9035E2TE3 (Vishay Sprague): Active status, ROHS3 compliant, MSL 1, 275 mOhm ESR. Significantly reduced ESR for applications requiring superior high-frequency performance.
T494D226K035AT (KEMET): Active status, ROHS3 compliant, MSL 1, 400 mOhm ESR. Moderate ESR reduction for improved performance.

Conformal Coated Alternatives (Environmental Protection):

The following parts provide conformal coating for enhanced environmental protection with active product status:

594D226X9035D2T (Vishay Sprague): Active status, ROHS3 compliant, MSL 2A, 270 mOhm ESR, conformal coated. Suitable for applications requiring moisture and contamination protection.
595D226X9035D2T (Vishay Sprague): Active status, ROHS3 compliant, MSL 2A, 320 mOhm ESR, conformal coated. Suitable for applications requiring moisture and contamination protection.

All substitute parts are REACH Unaffected and classified as EAR99 for export control purposes, matching the regulatory status of the original component.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower ESR than the original 2-1879057-1?

A: Yes. Lower ESR values (600 mOhm, 400 mOhm, 300 mOhm, 275 mOhm, 270 mOhm, 320 mOhm) are functionally compatible and represent performance improvements. Lower ESR reduces impedance at high frequencies and decreases thermal dissipation, which is beneficial for most circuit applications.

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

A: Molded tantalum capacitors feature a standard epoxy molded case. Conformal coated variants (594D226X9035D2T and 595D226X9035D2T) include an additional protective coating that provides enhanced resistance to moisture and environmental contamination. Conformal coated parts carry MSL 2A rating versus MSL 1 for molded types.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original TE Connectivity 2-1879057-1 is obsolete and does not carry RoHS certification, but all recommended substitutes meet current RoHS3 requirements.

Q: Can I interchange parts with different manufacturer size codes (D, E, X)?

A: Manufacturer size codes indicate internal construction variations. Parts with different size codes may have minor dimensional differences in height or length. The 2917 (7343 Metric) package specification accommodates these variations. Verify physical dimensions against your PCB layout constraints before selection.

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

A: MSL 1 (Unlimited) indicates the component can be stored indefinitely without moisture absorption concerns. MSL 2A (4 Weeks) requires controlled storage conditions and baking procedures if storage exceeds specified timeframes. For standard manufacturing environments, both ratings are acceptable; MSL 1 parts offer greater handling flexibility.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly across manufacturers. T491D226K035AT (KEMET) offers the highest inventory availability at 2700 pieces. 593D226X9035E2TE3 (Vishay Sprague) provides 10100 pieces for applications requiring high-volume supply assurance.

Q: What is the lifetime specification for these capacitors?

A: KEMET parts (T491 and T494 series) specify 2000 hours at 125°C. KYOCERA AVX F931V226KNC specifies 2000 hours at 125°C. Vishay Sprague molded and conformal coated variants do not provide explicit lifetime specifications in the provided data. For applications requiring defined lifetime specifications, KEMET or KYOCERA AVX parts are recommended.

Q: Can I use T491X226K035AT as a direct replacement for T491D226K035AT?

A: Yes. Both are KEMET T491 series parts with identical electrical specifications (22 µF, 35 V, ±10%, 700 mOhm ESR, MSL 1). The primary difference is the manufacturer size code (X versus D), which indicates minor internal construction variations. Both are functionally equivalent for circuit applications.

Q: What packaging options are available for these substitutes?

A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging formats. Selection depends on manufacturing process requirements. Tape & Reel packaging is standard for automated assembly lines, while Cut Tape & Digi-Reel® is suitable for lower-volume or mixed-component applications.

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