T520X687M004ASE015 Equivalent & Substitute Parts

Part Overview

The T520X687M004ASE015 is a 680 µF molded tantalum polymer capacitor rated at 4 V with an ESR of 15 mOhm @ 100 kHz, manufactured by KEMET in the KO-CAP® T520 series. This component is classified as obsolete. Due to its discontinued status, equivalent substitute parts from the same manufacturer series are available to maintain design compatibility and ensure supply chain continuity for applications requiring this capacitance and voltage rating.

Key Parameters

Parameter	Value
Capacitance	680 µF
Voltage - Rated	4 V
ESR (Equivalent Series Resistance)	15 mOhm @ 100 kHz
Type	Molded Tantalum Polymer
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 105°C
Lifetime @ Temp.	2000 Hrs @ 105°C
Tolerance	±20%
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the T520X687M004ASE015 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 680 µF
Voltage Rating: 4 V
ESR: 15 mOhm @ 100 kHz
Package / Case: 2917 (7343 Metric)
Type: Molded Tantalum Polymer
Mounting Type: Surface Mount
Operating Temperature Range: -55°C ~ 105°C
Lifetime @ Temp.: 2000 Hrs @ 105°C
Tolerance: ±20%
MSL: 3 (168 Hours)

All substitute parts listed maintain these electrical and mechanical specifications. Variations occur only in physical height (seated maximum) and product status (active vs. obsolete). The substitute parts are all active products from the KEMET KO-CAP® T520 series, offering improved availability compared to the obsolete main part number.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	ESR @ 100 kHz	Package	Height - Seated (Max)	Product Status	RoHS Status	Inventory
T520X687M004ASE015	KEMET	680 µF	4 V	15 mOhm	2917 (7343 Metric)	0.169" (4.30 mm)	Obsolete	RoHS Non-Compliant	956 Pcs
T520D687M004ATE015	KEMET	680 µF	4 V	15 mOhm	2917 (7343 Metric)	0.122" (3.10 mm)	Active	ROHS3 Compliant	2200 Pcs
T520X687M004ATE015	KEMET	680 µF	4 V	15 mOhm	2917 (7343 Metric)	0.169" (4.30 mm)	Active	ROHS3 Compliant	1385 Pcs
T520Y687M004ATE015	KEMET	680 µF	4 V	15 mOhm	2917 (7343 Metric)	0.157" (4.00 mm)	Active	ROHS3 Compliant	2705 Pcs
T520X687M004ATE0157280	KEMET	680 µF	4 V	15 mOhm	2917 (7343 Metric)	0.169" (4.30 mm)	Active	ROHS3 Compliant	744 Pcs
T520X687M004ATE0158000	KEMET	680 µF	4 V	15 mOhm	2917 (7343 Metric)	0.169" (4.30 mm)	Active	ROHS3 Compliant	882 Pcs

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): T520X687M004ATE015 is the direct functional equivalent with identical physical height (0.169" / 4.30 mm) to the obsolete T520X687M004ASE015. This part maintains the same form factor while offering active product status and ROHS3 compliance. Current inventory: 1385 Pcs.

Alternative Substitutes (Height Variation):

T520D687M004ATE015: Reduced height (0.122" / 3.10 mm). Suitable for space-constrained applications where lower profile is beneficial. Highest inventory availability: 2200 Pcs.
T520Y687M004ATE015: Intermediate height (0.157" / 4.00 mm). Moderate profile reduction. Highest inventory availability: 2705 Pcs.

Parametric Equivalents (Reel Configuration Variants):

T520X687M004ATE0157280: Identical to T520X687M004ATE015 with reel configuration variant. Inventory: 744 Pcs.
T520X687M004ATE0158000: Identical to T520X687M004ATE015 with reel configuration variant. Inventory: 882 Pcs.

All substitute parts are ROHS3 compliant, addressing regulatory requirements that the obsolete main part does not meet. Selection should be based on available PCB height clearance and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can T520D687M004ATE015 replace T520X687M004ASE015 in my design? A: Yes. T520D687M004ATE015 is electrically equivalent with identical capacitance (680 µF), voltage rating (4 V), and ESR (15 mOhm @ 100 kHz). The primary difference is physical height: 0.122" (3.10 mm) versus 0.169" (4.30 mm). Verify PCB layout clearance before substitution.

Q: What is the difference between T520X687M004ATE015 and T520X687M004ATE0157280? A: Both parts are electrically and mechanically identical. The suffix variation (7280 vs. 7280) indicates different reel configurations or manufacturing lot tracking. Electrical performance and physical dimensions are equivalent.

Q: Is the obsolete T520X687M004ASE015 still available? A: Yes, 956 Pcs are currently in stock. However, this part is classified as obsolete. For new designs or long-term supply assurance, active substitute parts are recommended.

Q: Why should I choose an active product over the obsolete part? A: Active products offer continued manufacturer support, ROHS3 compliance, and guaranteed long-term availability. Obsolete parts face supply discontinuation risk and do not meet current regulatory standards.

Q: Are all substitute parts compatible with the 2917 (7343 Metric) package footprint? A: Yes. All substitute parts use the identical 2917 (7343 Metric) package with the same footprint dimensions (0.287" L x 0.169" W / 7.30 mm x 4.30 mm). Height variation does not affect PCB footprint compatibility.

Q: What is MSL 3 (168 Hours) and does it affect substitution? A: MSL 3 indicates Moisture Sensitivity Level 3, requiring storage at controlled humidity for up to 168 hours before soldering. All listed parts share this specification, so substitution does not change moisture handling requirements.

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