SN3R3M035ST Equivalent & Substitute Parts

Part Overview

The SN3R3M035ST is a 3.3 µF, 35 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The part operates across a temperature range of -40°C to 85°C with a rated lifetime of 1000 hours at 85°C, suitable for general-purpose applications requiring through-hole mounting.

Substiute Parts

SN3R3M035ST

Cornell Dubilier Electronics (CDE)In Stock: 844SN3R3M035ST Datasheet

Current PartRFQ

ECE-A1HN3R3U

Panasonic Electronic ComponentsIn Stock: 2038ECE-A1HN3R3U Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN3R3M035ST is determined by the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 3.3 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Polarization: Bi-Polar (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can (exact match required)
• Lead Spacing: 0.079" (2.00mm) (exact match required)
• Size / Dimension: 0.197" Dia (5.00mm) (exact match required)

Allowable Variation Parameters:

• Voltage - Rated: Substitute must equal or exceed 35 V
• Operating Temperature Range: Substitute must support -40°C ~ 85°C minimum
• Lifetime @ Temp.: Substitute may differ from 1000 Hrs @ 85°C
• ESR (Equivalent Series Resistance): Substitute may differ
• Ripple Current: Substitute may differ

The ECE-A1HN3R3U from Panasonic Electronic Components qualifies as a substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

The ECE-A1HN3R3U is a qualified substitute for the obsolete SN3R3M035ST based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match or exceed the original specification. The substitute provides a higher rated voltage (50 V versus 35 V), which is acceptable for direct substitution in circuits designed for 35 V operation. The capacitance value, tolerance, and operating temperature range are identical.

Mechanical Compatibility: Lead spacing, package type, and body diameter are identical, ensuring direct PCB footprint compatibility. The substitute is 0.039" (1.00mm) taller in seated height. This dimension difference must be verified against available board clearance in the target application.

Product Status and Compliance: The ECE-A1HN3R3U is classified as Active, providing long-term availability and supply chain stability. Both parts maintain ROHS3 compliance, satisfying regulatory requirements.

Lifetime Performance: The substitute provides extended lifetime (2000 hours at 85°C versus 1000 hours), representing improved reliability characteristics.

Frequently Asked Questions (FAQ)

Q: Can the ECE-A1HN3R3U directly replace the SN3R3M035ST on existing PCBs?

A: Yes, for applications where the additional 0.039" (1.00mm) height does not create clearance conflicts. Verify available vertical space above the component mounting location before implementation.

Q: Why does the substitute have a higher voltage rating (50 V versus 35 V)?

A: Higher voltage-rated capacitors of identical capacitance and package dimensions are acceptable substitutes. The circuit will operate normally at the lower voltage stress level. This does not affect circuit performance or reliability.

Q: Are the lead spacing and footprint dimensions identical?

A: Yes. Both parts feature 0.079" (2.00mm) lead spacing and 0.197" (5.00mm) body diameter, ensuring identical PCB footprint compatibility.

Q: What is the significance of the extended lifetime specification?

A: The ECE-A1HN3R3U provides 2000 hours at 85°C compared to 1000 hours for the original part. This represents improved long-term reliability and is not a limitation for substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN3R3M035ST and ECE-A1HN3R3U are ROHS3 compliant, meeting current environmental and regulatory standards.

Q: What is the tolerance specification, and does it affect substitution?

A: Both parts carry ±20% tolerance. This tolerance applies to the capacitance value and is identical between the original and substitute, ensuring equivalent circuit performance.