SR305C684KAATR1 Equivalent & Substitute Parts

Part Overview

The SR305C684KAATR1 is a 0.68 µF ±10% 50V ceramic capacitor with X7R temperature coefficient manufactured by KYOCERA AVX in the SkyCap® SR series. This radial through-hole component is designed for general-purpose applications across an operating temperature range of -55°C to 125°C.

The SR305C684KAATR1 carries an Obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this capacitor specification.

Key Parameters

Parameter	Value
Capacitance	0.68 µF
Tolerance	±10%
Voltage Rating	50V
Temperature Coefficient	X7R
Operating Temperature Range	-55°C to 125°C
Mounting Type	Through Hole
Package Type	Radial
Lead Spacing	0.200" (5.08mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SR305C684KAATR1 are classified into three categories based on electrical and mechanical compatibility:

Direct Equivalents (Same Voltage Rating - 50V): Parts maintaining identical capacitance (0.68 µF), tolerance (±10%), voltage rating (50V), temperature coefficient (X7R), and operating temperature range (-55°C to 125°C). These parts differ only in physical dimensions, lead style, or packaging format while maintaining electrical performance in the original application.

Manufacturer Recommended Equivalent: SR305C684KARTR1 from KYOCERA AVX represents the active production equivalent with identical electrical specifications and packaging in Tape & Reel format, replacing the obsolete SR305C684KAATR1.

Upgraded Voltage Rating (100V): Parts with identical capacitance, tolerance, and temperature coefficient but rated for 100V operation. These provide enhanced voltage margin and are suitable for applications where the original 50V rating is adequate but higher voltage headroom is beneficial.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Temp Coeff	Mounting	Package	Lead Spacing	Product Status	Inventory
SR305C684KAATR1	KYOCERA AVX	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.200" (5.08mm)	Obsolete	885 Pcs
SR305C684KARTR1	KYOCERA AVX	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.200" (5.08mm)	Active	1025 Pcs
SR301C684KARTR1	KYOCERA AVX	0.68 µF	100V	±10%	X7R	Through Hole	Radial	0.200" (5.08mm)	Active	725 Pcs
C330C684K5R5TA	KEMET	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.200" (5.08mm)	Active	560350 Pcs
FK20X7R1H684KN000	TDK Corporation	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Not For New Designs	1527 Pcs
FK24X7R1H684KR000	TDK Corporation	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Not For New Designs	1276 Pcs
K684K20X7RF5TH5	Vishay Beyschlag/Draloric/BC Components	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Active	1026 Pcs
RDER71H684K2K1H03B	Murata Electronics	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Active	985 Pcs
RDER71H684K2M1H03A	Murata Electronics	0.68 µF	50V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Active	4116 Pcs
FK22X7R2A684KN000	TDK Corporation	0.68 µF	100V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Not For New Designs	2426 Pcs
FK26X7R2A684KN000	TDK Corporation	0.68 µF	100V	±10%	X7R	Through Hole	Radial	0.197" (5.00mm)	Not For New Designs	2162 Pcs

Engineering Selection Recommendations

Primary Selection: SR305C684KARTR1 (KYOCERA AVX) is the recommended direct replacement. This part maintains identical electrical specifications and mechanical compatibility with the obsolete SR305C684KAATR1 while offering Active product status and higher inventory availability (1025 Pcs).

Alternative Direct Equivalents: C330C684K5R5TA (KEMET), RDER71H684K2M1H03A (Murata Electronics), and K684K20X7RF5TH5 (Vishay) provide functionally equivalent 50V solutions from established manufacturers with Active product status. All maintain the required 0.68 µF capacitance, ±10% tolerance, X7R temperature coefficient, and -55°C to 125°C operating range. Lead spacing tolerance of 0.197" (5.00mm) versus the original 0.200" (5.08mm) requires PCB layout verification for through-hole applications.

Voltage-Upgraded Options: SR301C684KARTR1 (KYOCERA AVX), FK22X7R2A684KN000 (TDK), and FK26X7R2A684KN000 (TDK) provide 100V rated equivalents with identical capacitance and tolerance specifications. These are suitable for applications where the original 50V rating is adequate but additional voltage margin is desired. All maintain ROHS3 compliance and X7R temperature stability.

Compliance Verification: All listed substitutes maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can SR305C684KARTR1 directly replace SR305C684KAATR1 in existing designs?

A: Yes. SR305C684KARTR1 maintains identical electrical specifications (0.68 µF, ±10%, 50V, X7R, -55°C to 125°C) and mechanical compatibility (0.200" lead spacing, radial through-hole package). The primary difference is packaging format (Tape & Reel versus the original format) and Active product status.

Q: What is the significance of the X7R temperature coefficient?

A: X7R designates a temperature coefficient of ±15% across the -55°C to 125°C operating range. This specification is consistent across all listed substitutes and ensures stable capacitance performance across the full operating temperature envelope required for general-purpose applications.

Q: Are parts with 0.197" (5.00mm) lead spacing compatible with PCBs designed for 0.200" (5.08mm) spacing?

A: Lead spacing tolerance of 0.003" (0.08mm) requires PCB layout verification. While minor spacing variations may accommodate through-hole insertion, designs with tight mechanical tolerances should confirm compatibility with the specific PCB footprint before implementation.

Q: When should 100V rated equivalents be selected instead of 50V parts?

A: 100V rated parts (SR301C684KARTR1, FK22X7R2A684KN000, FK26X7R2A684KN000) are suitable for applications where the original 50V rating is adequate but higher voltage margin is beneficial for reliability or design margin. Electrical performance at 50V operation remains identical to 50V rated parts.

Q: What inventory considerations apply to substitute selection?

A: C330C684K5R5TA (KEMET) offers significantly higher inventory (560350 Pcs) compared to other direct equivalents, supporting high-volume production requirements. RDER71H684K2M1H03A (Murata) provides 4116 Pcs in Cut Tape packaging for moderate-volume applications.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification consistent with the original SR305C684KAATR1 specification.

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