M39003/01-5478 Equivalent & Substitute Parts

Part Overview

The M39003/01-5478 is a 1 µF hermetically sealed tantalum capacitor rated for 50 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 the -55°C to 125°C operating temperature range. The part is currently active and available in inventory. Substitute parts are identified to address supply continuity, alternative failure rate requirements, or specific ESR characteristics needed for particular circuit applications.

Key Parameters

Parameter	Value
Capacitance	1 µF
Tolerance	±5%
Voltage Rating	50 V
Type	Hermetically Sealed
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C to 125°C
Series	Military, MIL-PRF-39003/1, CSR13
Features	High Reliability

Substitute Part Grouping Explanation

Substitution for M39003/01-5478 is determined by the following criteria:

Core Electrical Parameters (Must Match):

Capacitance: 1 µF
Voltage Rating: 50 V
Type: Hermetically Sealed
Series: MIL-PRF-39003/1, CSR13

Allowable Variations:

Tolerance: Original part specifies ±5%; substitute parts with ±10% tolerance are acceptable as they remain within the same military specification envelope
ESR (Equivalent Series Resistance): Substitute parts specify 8 Ohm @ 100kHz or 8 Ohm; these values are provided where available and do not restrict substitution
Failure Rate: Original part rated R (0.01%); substitute parts offer alternative failure rates (M, P, S, B) to match specific reliability requirements

Physical Compatibility:

Mounting Type: Through Hole (all parts)
Package: Axial (all parts)
Size Code: A (all parts)
Dimensional variations exist (original: 0.135" Dia x 0.286" L; substitutes: 0.135" Dia x 0.422" L) but remain within axial package constraints

All substitute parts are manufactured by KEMET under the same military specification base product number M39003/01 and maintain active product status.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage Rating	ESR	Failure Rate	Operating Temperature	Inventory (Pcs)
M39003/01-5478	Vishay Sprague	1 µF	±5%	50 V	—	R (0.01%)	-55°C to 125°C	734
M39003/01-2356	KEMET	1 µF	±10%	50 V	8 Ohm @ 100kHz	M (1%)	-55°C to 125°C	1080
M39003/01-2836	KEMET	1 µF	±10%	50 V	8 Ohm	R (0.01%)	-55°C to 125°C	1189
M39003/01-2596	KEMET	1 µF	±10%	50 V	8 Ohm	P (0.1%)	-55°C to 125°C	1149
M39003/01-3076	KEMET	1 µF	±10%	50 V	8 Ohm	S (0.001%)	-55°C to 125°C	1118
M39003/01-6194	KEMET	1 µF	±10%	50 V	8 Ohm	B (0.1%)	-55°C to 125°C	1135

Engineering Selection Recommendations

For Direct Replacement (Matched Failure Rate): M39003/01-2836 provides equivalent R-level failure rate (0.01%) to the original M39003/01-5478, with higher inventory availability (1189 pcs vs. 734 pcs). Both parts maintain MIL-PRF-39003/1 certification and active product status.

For Enhanced Reliability: M39003/01-3076 offers S-level failure rate (0.001%), representing the highest reliability option among available substitutes. This part is appropriate for applications requiring superior long-term performance under military or aerospace specifications.

For Standard Reliability Applications: M39003/01-2356, M39003/01-2596, and M39003/01-6194 provide alternative failure rates (M, P, and B respectively) suitable for applications where the original R-level specification is not mandatory. These parts maintain full MIL-PRF-39003/1 compliance.

Compliance Considerations: All substitute parts share identical RoHS non-compliance status, REACH-affected designation, ECCN (EAR99), and HTSUS classification (8532.21.0020) with the original part. No compliance barriers exist for substitution.

Frequently Asked Questions (FAQ)

Q: Can M39003/01-2836 be used as a direct replacement for M39003/01-5478?

A: Yes. Both parts maintain identical capacitance (1 µF), voltage rating (50 V), failure rate (R, 0.01%), operating temperature range (-55°C to 125°C), and MIL-PRF-39003/1 certification. The tolerance difference (±5% vs. ±10%) does not prevent substitution within military specification parameters. Physical dimensions differ slightly (length: 0.286" vs. 0.422"), but both conform to axial package constraints.

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

A: Failure rate codes (R, M, P, S, B) indicate the expected percentage of component failures per 1000 hours of operation under specified conditions. R (0.01%) represents the original specification. S (0.001%) indicates superior reliability; M (1%) indicates lower reliability. Selection depends on application criticality and mission requirements.

Q: Are there dimensional compatibility concerns with substitute parts?

A: Substitute parts are longer (0.422" L vs. 0.286" L) but maintain the same 0.135" diameter and axial package configuration. Verify available board space and lead routing before substitution. All parts use identical through-hole mounting and lead spacing.

Q: Do substitute parts have different ESR characteristics?

A: Substitute parts specify 8 Ohm ESR (measured @ 100kHz or unspecified frequency), while the original part does not provide ESR data. ESR affects high-frequency performance and ripple current handling. Verify ESR requirements for your specific circuit application before substitution.

Q: Can parts with ±10% tolerance replace a ±5% tolerance specification?

A: Yes, within MIL-PRF-39003/1 military specifications. The ±10% tolerance is a broader specification that encompasses the ±5% tolerance range. Substitution is valid provided circuit design does not require the tighter tolerance control of the original part.

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