TXA685M050P1C Equivalent & Substitute Parts Reference

Part Overview

The TXA685M050P1C is a 6.8 µF hermetically sealed tantalum capacitor rated at 50 V, manufactured by Cornell Dubilier Electronics (CDE) in axial through-hole configuration. This component is classified as obsolete, indicating discontinued production and limited availability in the supply chain. The part maintains 977 units in current inventory stock. Identification of equivalent substitute parts is necessary to ensure design continuity and procurement reliability for applications requiring this capacitance and voltage specification.

Substiute Parts

TXA685M050P1C

Cornell Dubilier Electronics (CDE)In Stock: 1080TXA685M050P1C Datasheet

Current PartRFQ

135D685X9075C2

Vishay SpragueIn Stock: 1201135D685X9075C2 Datasheet

UpgradeRFQ

135D685X9075C6

Vishay SpragueIn Stock: 939135D685X9075C6 Datasheet

UpgradeRFQ

135D685X9125C2

Vishay SpragueIn Stock: 717135D685X9125C2 Datasheet

UpgradeRFQ

135D685X9125C6

Vishay SpragueIn Stock: 2103135D685X9125C6 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TXA685M050P1C are selected based on the following criteria that define functional equivalence:

Primary Matching Criteria:

• Capacitance value: 6.8 µF (exact match required)
• Mounting type: Through hole axial configuration
• Type: Hermetically sealed tantalum construction
• Operating temperature range: Minimum -55°C to 125°C support

Voltage Rating Consideration: Substitute parts are grouped by voltage rating. The original part operates at 50 V. Substitute parts with higher voltage ratings (75 V and 125 V) are electrically compatible in 50 V applications, as voltage derating provides additional safety margin. Lower voltage ratings are not acceptable substitutes.

Tolerance Improvement: The original TXA685M050P1C specifies ±20% tolerance. All substitute parts from Vishay Sprague 135D series offer improved ±10% tolerance, providing tighter capacitance control.

Temperature Range Variants: Substitute parts are available in two temperature configurations: -55°C to 125°C and -55°C to 200°C. Both support the original operating range; the extended range variants provide additional thermal headroom for demanding applications.

Parameter Comparison

Engineering Selection Recommendations

Substitution Validity: All four Vishay Sprague 135D series parts (135D685X9075C2, 135D685X9075C6, 135D685X9125C2, 135D685X9125C6) are valid electrical substitutes for the TXA685M050P1C. Each part maintains the required 6.8 µF capacitance, through-hole axial mounting configuration, and hermetically sealed tantalum construction. All substitute parts are classified as active products with current manufacturing status, ensuring long-term supply chain availability.

Voltage Rating Selection:

• 75 V rated parts (135D685X9075C2, 135D685X9075C6): Provide 50% voltage derating margin above the original 50 V specification. Suitable for applications with moderate voltage headroom requirements.
• 125 V rated parts (135D685X9125C2, 135D685X9125C6): Provide 150% voltage derating margin. Recommended for applications requiring maximum voltage safety margin or operating in high-stress electrical environments.

Temperature Range Selection:

• Standard range (-55°C to 125°C): 135D685X9075C2 and 135D685X9125C2 match the original operating temperature specification.
• Extended range (-55°C to 200°C): 135D685X9075C6 and 135D685X9125C6 support elevated temperature applications beyond the original specification.

Tolerance Improvement: All substitute parts feature ±10% tolerance compared to the original ±20% tolerance, resulting in improved capacitance accuracy and reduced circuit performance variation.

Physical Dimensions: Substitute parts measure 0.203" diameter x 0.453" length (5.16mm x 11.51mm), compared to the original 0.185" diameter x 0.474" length (4.70mm x 12.04mm). Verify PCB layout and mechanical clearance before implementation.

Compliance Considerations: All parts maintain identical RoHS non-compliance and REACH unaffected status. No compliance advantage is gained through substitution.

Inventory Availability: The 135D685X9125C6 variant offers the highest current inventory (1995 units), providing optimal supply chain security for high-volume procurement.

Frequently Asked Questions (FAQ)

Q: Can I use a 75 V or 125 V rated substitute in a 50 V application?

A: Yes. Higher voltage-rated capacitors are electrically compatible in lower voltage applications. The 75 V and 125 V rated substitutes provide voltage derating, which improves reliability and extends component life in 50 V circuits.

Q: What is the difference between the C2 and C6 variants?

A: The C2 variants (135D685X9075C2, 135D685X9125C2) operate over -55°C to 125°C. The C6 variants (135D685X9075C6, 135D685X9125C6) extend the upper temperature limit to 200°C. Select C6 for applications requiring elevated temperature operation; otherwise, C2 variants are sufficient.

Q: Will the slightly larger physical dimensions of the substitute parts fit my PCB?

A: The substitute parts measure 0.203" diameter x 0.453" length compared to the original 0.185" diameter x 0.474" length. The diameter increase is 0.018" and the length decrease is 0.021". Verify your PCB layout accommodates these dimensional changes before component placement.

Q: Why do the substitute parts have different ESR values?

A: The 75 V rated substitutes (135D685X9075C2, 135D685X9075C6) specify 6.8 Ohm ESR, while the 125 V rated substitutes (135D685X9125C2, 135D685X9125C6) specify 11.7 Ohm ESR. ESR variation is inherent to different voltage ratings within the same capacitance family. Verify ESR compatibility with your circuit's ripple current and frequency requirements.

Q: Is the ±10% tolerance improvement significant for my application?

A: The tolerance improvement from ±20% to ±10% reduces capacitance variation by 50%. This results in tighter circuit performance, reduced tolerance stack-up in multi-component designs, and improved predictability in frequency-dependent applications. Evaluate your circuit's sensitivity to capacitance variation to determine if this improvement is beneficial.

Q: Which substitute part should I select for new designs?

A: For new designs, the 135D685X9125C6 is recommended. It offers the highest voltage rating (125 V), extended temperature range (-55°C to 200°C), improved tolerance (±10%), active product status, and highest current inventory (1995 units). This combination provides maximum design flexibility and supply chain security.

Q: Are all substitute parts RoHS compliant?

A: No. All substitute parts maintain RoHS non-compliance status identical to the original TXA685M050P1C. If RoHS compliance is required for your application, alternative component families must be evaluated.