T350B474K050AS Equivalent & Substitute Parts

Part Overview

The T350B474K050AS is a 0.47 µF conformal coated tantalum capacitor rated for 50 V operation in a radial through-hole package. Manufactured by KEMET as part of the T350 UltraDip II series, this component is designed for general-purpose applications requiring reliable energy storage in compact form factors. The part is currently active in production with 637 units in stock.

Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support applications where alternative compliance certifications or packaging specifications are required.

Key Parameters

Parameter	Value	Unit
Capacitance	0.47	µF
Voltage Rating	50	V
Tolerance	±10%	—
Type	Conformal Coated Tantalum	—
ESR	13	Ohm
Operating Temperature Range	-55°C to 125°C	—
Mounting Type	Through Hole Radial	—
Package Diameter	0.177" (4.50 mm)	—
Maximum Seated Height	0.299" (7.60 mm)	—
Lead Spacing	0.100" (2.54 mm)	—

Substitute Part Grouping Explanation

Substitute parts for the T350B474K050AS are identified based on electrical and mechanical parameter equivalence. The substitution logic is structured as follows:

Direct Manufacturer Equivalent (KEMET): The T350B474K050AT maintains identical electrical specifications (0.47 µF, 50 V, ±10% tolerance, 13 Ohm ESR) and mechanical dimensions (0.177" diameter, 0.299" height, 0.100" lead spacing). The primary distinction is RoHS compliance status: T350B474K050AT is ROHS3 compliant, whereas the main part is RoHS non-compliant.

Cross-Manufacturer Equivalent (KYOCERA AVX): The TAP474K050SCS from KYOCERA AVX meets all critical electrical parameters (0.47 µF, 50 V, ±10% tolerance, 13 Ohm ESR) and operates within the same temperature range (-55°C to 125°C). Mechanical dimensions are functionally equivalent with minor variations: 0.177" diameter (identical), 0.276" height (0.023" shorter), and 0.098" lead spacing (0.002" tighter). This part includes documented lifetime rating (1000 Hrs @ 85°C) and ROHS3 compliance.

Substitution Criteria:

Capacitance: 0.47 µF (exact match required)
Voltage Rating: 50 V (exact match required)
Tolerance: ±10% (exact match required)
ESR: 13 Ohm (exact match required)
Operating Temperature: -55°C to 125°C (exact match required)
Package Type: Radial through-hole (exact match required)
Mechanical Compatibility: Diameter and lead spacing within PCB layout tolerances

Parameter Comparison

Parameter	T350B474K050AS (Main)	T350B474K050AT (Direct Equivalent)	TAP474K050SCS (Cross-Manufacturer)
Manufacturer	KEMET	KEMET	KYOCERA AVX
Series	T350 UltraDip II	T350 UltraDip II	TAP
Capacitance	0.47 µF	0.47 µF	0.47 µF
Voltage Rating	50 V	50 V	50 V
Tolerance	±10%	±10%	±10%
Type	Conformal Coated	Conformal Coated	Conformal Coated
ESR	13 Ohm	13 Ohm	13 Ohm
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Through Hole Radial	Through Hole Radial	Through Hole Radial
Package Diameter	0.177" (4.50 mm)	0.177" (4.50 mm)	0.177" (4.50 mm)
Maximum Height	0.299" (7.60 mm)	0.299" (7.60 mm)	0.276" (7.00 mm)
Lead Spacing	0.100" (2.54 mm)	0.100" (2.54 mm)	0.098" (2.50 mm)
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant
Lifetime @ Temp.	Not Specified	Not Specified	1000 Hrs @ 85°C
Current Inventory	637 Pcs	915 Pcs	2321 Pcs

Engineering Selection Recommendations

For RoHS Compliance Requirements: The T350B474K050AT is the direct equivalent when ROHS3 compliance is mandated. This KEMET part maintains identical electrical and mechanical specifications while satisfying regulatory requirements. It is produced by the same manufacturer and series, ensuring design continuity.

For Cross-Manufacturer Flexibility: The TAP474K050SCS from KYOCERA AVX provides an alternative source for supply chain resilience. This part meets all electrical specifications and includes documented reliability data (1000 Hrs @ 85°C). The 0.023" reduction in seated height and 0.002" tighter lead spacing are within standard PCB layout tolerances for radial through-hole components and do not compromise mechanical compatibility.

For Regulatory and Compliance Considerations: Both substitute parts carry ROHS3 compliance and REACH Unaffected status, aligning with modern regulatory frameworks. The main part (T350B474K050AS) is RoHS non-compliant and should be evaluated against project-specific compliance requirements before selection.

For Inventory and Availability: The TAP474K050SCS offers the highest current inventory (2321 units), followed by T350B474K050AT (915 units). Selection based on availability should account for lead time and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can T350B474K050AT be used as a direct replacement for T350B474K050AS?

A: Yes. The T350B474K050AT is electrically and mechanically equivalent. Both parts share identical capacitance (0.47 µF), voltage rating (50 V), tolerance (±10%), ESR (13 Ohm), operating temperature range (-55°C to 125°C), and package dimensions. The primary difference is RoHS compliance status. Substitution is valid for applications where ROHS3 compliance is acceptable or required.

Q: What are the mechanical compatibility considerations for TAP474K050SCS?

A: The TAP474K050SCS has a seated height of 0.276" compared to 0.299" for the main part, a difference of 0.023". Lead spacing is 0.098" versus 0.100", a difference of 0.002". These variations are within standard PCB layout tolerances for radial through-hole components and do not affect mechanical fit or electrical performance in standard applications.

Q: Are all three parts suitable for the same operating temperature range?

A: Yes. All three parts operate across -55°C to 125°C. The TAP474K050SCS includes additional reliability documentation specifying 1000 hours of operation at 85°C, providing quantified performance data for thermal stress analysis.

Q: What is the significance of the conformal coating on these capacitors?

A: Conformal coating provides environmental protection against moisture, salt spray, and contaminants. All three parts in this comparison are conformal coated, ensuring equivalent environmental performance across different manufacturers and part numbers.

Q: How do ESR values affect circuit performance?

A: All three parts have identical ESR of 13 Ohm. ESR determines ripple current handling, transient response, and power dissipation. Equivalent ESR values ensure interchangeable performance in filtering, decoupling, and energy storage applications.

Q: Which part should be selected for new designs?

A: For new designs, T350B474K050AT or TAP474K050SCS are recommended due to ROHS3 compliance. T350B474K050AT maintains KEMET sourcing continuity, while TAP474K050SCS provides cross-manufacturer redundancy and higher inventory availability.

Q: Are there any lead-time differences between these parts?

A: Lead times depend on current inventory and supplier logistics. TAP474K050SCS currently has the highest inventory (2321 units), potentially offering shorter procurement cycles. Specific lead-time information should be obtained from component distributors.

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