M39003/01-2785 Equivalent & Substitute Parts

Part Overview

The M39003/01-2785 is a 6.8 µF hermetically sealed tantalum capacitor rated for 35 V, manufactured by Vishay Sprague to MIL-PRF-39003/1 military specifications. This axial through-hole component is designed for high-reliability applications requiring stable capacitance performance across extended temperature ranges (-55°C to 125°C). The part is currently active in production with 1011 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter tolerances for this product category.

Substiute Parts

M39003/01-2785

Vishay SpragueIn Stock: 1044M39003/01-2785 Datasheet

Current PartRFQ

M39003/01-6108

KEMETIn Stock: 1095M39003/01-6108 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the M39003/01-2785 is based on the following critical parameters:

• Capacitance Value: Must be 6.8 µF
• Voltage Rating: Must be 35 V or higher
• Type: Hermetically sealed tantalum construction
• Mounting: Through-hole axial package
• Temperature Range: Must support -55°C to 125°C operation
• Series Compliance: MIL-PRF-39003/1 military specification

The M39003/01-6108 qualifies as a direct substitute because it maintains identical capacitance, voltage rating, hermetic sealing, axial mounting, temperature range, and military series compliance. Tolerance variation (±10% versus ±20%) and ESR specification (2.5 Ohm) represent improved electrical characteristics that do not preclude substitution in applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

Both the M39003/01-2785 and M39003/01-6108 are active production components meeting MIL-PRF-39003/1 military specifications. Selection between these parts should be based on:

• Tolerance Requirements: The M39003/01-6108 offers tighter tolerance (±10%) compared to the M39003/01-2785 (±20%), providing improved capacitance accuracy for precision applications.
• Failure Rate: The M39003/01-2785 specifies a lower failure rate (R: 0.01%) versus the M39003/01-6108 (B: 0.1%), relevant for ultra-high-reliability mission-critical systems.
• ESR Specification: The M39003/01-6108 provides explicit ESR rating (2.5 Ohm), enabling precise circuit performance prediction in applications sensitive to series resistance.
• Compliance Status: Both parts share identical RoHS and REACH compliance status, with no differentiation in regulatory standing.
• Availability: Both parts are in active stock (1011 and 1015 units respectively), ensuring supply continuity.

Frequently Asked Questions (FAQ)

Q: Can M39003/01-6108 replace M39003/01-2785 in existing designs?

A: Yes. Both parts maintain identical capacitance (6.8 µF), voltage rating (35 V), hermetic sealing, axial through-hole mounting, temperature range (-55°C to 125°C), and MIL-PRF-39003/1 military series compliance. The substitute offers improved tolerance and specified ESR without introducing incompatibility.

Q: What is the physical size difference between these parts?

A: Both parts use manufacturer size code B. The M39003/01-2785 measures 0.185" diameter × 0.474" length (4.70mm × 12.04mm). The M39003/01-6108 measures 0.185" diameter × 0.610" length (4.70mm × 15.49mm). The length difference must be accommodated in board layout and mechanical clearance planning.

Q: Does the ±10% tolerance of M39003/01-6108 affect circuit compatibility?

A: The tighter tolerance of M39003/01-6108 (±10%) is a subset of the M39003/01-2785 tolerance range (±20%). Applications designed for ±20% tolerance will operate within specification with the ±10% substitute. Applications requiring maximum tolerance margin should reference the original ±20% specification.

Q: What is the significance of the failure rate difference?

A: The M39003/01-2785 specifies failure rate R (0.01%), while M39003/01-6108 specifies failure rate B (0.1%). For applications with stringent reliability requirements, the lower failure rate of the M39003/01-2785 may be the determining factor. Both rates comply with MIL-PRF-39003/1 military standards.

Q: Are there compliance or certification differences?

A: Both parts are RoHS non-compliant and REACH Affected with identical ECCN (EAR99) and HTSUS (8532.21.0020) classifications. No compliance differentiation exists between the two parts.