Equivalent & Substitute Parts for 108SML004MD8

Part Overview

The 108SML004MD8 is a 1000 µF, 4 V aluminum electrolytic capacitor in surface mount radial can package manufactured by Cornell Dubilier / Illinois Capacitor. This component is classified as Active product status and is designed for general purpose applications requiring compact SMD form factors with controlled ESR characteristics.

Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter tolerances for the application circuit, while accommodating mechanical and thermal constraints of the target assembly environment.

Substiute Parts

108SML004MD8

Cornell Dubilier / Illinois CapacitorIn Stock: 1249108SML004MD8 Datasheet

Current PartRFQ

108AXZ6R3M

Cornell Dubilier / Illinois CapacitorIn Stock: 8278108AXZ6R3M Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for 108SML004MD8 is based on the following criteria:

Mandatory Matching Parameters:

• Capacitance: 1000 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: Radial, Can - SMD (exact match required)
• Size / Dimension: 0.315" Dia (8.00mm) (exact match required)
• Height - Seated (Max): 0.417" (10.60mm) (exact match required)
• Surface Mount Land Size: 0.327" L x 0.327" W (8.30mm x 8.30mm) (exact match required)
• Mounting Type: Surface Mount (exact match required)

Allowable Upgrade Parameters:

• Voltage - Rated: Substitute must equal or exceed 4 V
• ESR @ 120Hz: Lower values are acceptable (improved performance)
• Lifetime @ Temperature: Equal or greater lifetime acceptable
• Operating Temperature Range: Must encompass or exceed -40°C ~ 85°C
• Ripple Current @ 120 Hz: Equal or greater values acceptable
• Ripple Current @ 100 kHz: Equal or greater values acceptable
• RoHS Status: Must maintain ROHS3 Compliant status
• Moisture Sensitivity Level: Equal or lower MSL acceptable

The substitute part 108AXZ6R3M meets all mandatory matching parameters and provides improvements in voltage rating, ESR performance, temperature range, and ripple current handling.

Parameter Comparison

Engineering Selection Recommendations

108AXZ6R3M as Direct Substitute:

The 108AXZ6R3M is a direct substitute for 108SML004MD8 based on the following engineering criteria:

1. Electrical Equivalence: Both parts maintain identical capacitance (1000 µF) and tolerance (±20%), ensuring circuit performance equivalence at the component level.

2. Mechanical Compatibility: Identical package dimensions, height, and surface mount land size ensure direct PCB layout compatibility without redesign.

3. Performance Enhancement: The substitute provides measurable improvements in ESR (464 mOhm vs. 580 mOhm), higher ripple current capability at 100 kHz (600 mA vs. 450 mA), and extended operating temperature range (-55°C ~ 105°C vs. -40°C ~ 85°C).

4. Voltage Rating Upgrade: The 6.3 V rating of 108AXZ6R3M exceeds the 4 V requirement of 108SML004MD8, providing additional design margin for transient voltage conditions.

5. Compliance Status: Both parts maintain ROHS3 compliance and identical MSL rating, ensuring regulatory and manufacturing process compatibility.

6. Product Availability: Both parts are Active status with established supply chains (1183 Pcs and 8182 Pcs in stock respectively).

Selection Basis: Substitution is supported by identical mandatory parameters and superior performance characteristics across all allowable upgrade parameters.

Frequently Asked Questions (FAQ)

Q: Can 108AXZ6R3M replace 108SML004MD8 in existing PCB designs without layout modifications?

A: Yes. Both parts share identical package dimensions (0.315" Dia), height (0.417"), and surface mount land size (0.327" L x 0.327" W). PCB footprints are directly compatible without redesign.

Q: What is the significance of the voltage rating difference (4 V vs. 6.3 V)?

A: The 108AXZ6R3M's higher voltage rating (6.3 V) provides additional design margin. In circuits designed for 4 V operation, the substitute operates at lower stress levels, potentially extending component lifetime and improving reliability margins.

Q: Does the lower ESR of 108AXZ6R3M (464 mOhm vs. 580 mOhm) affect circuit performance?

A: Lower ESR is a performance improvement. It reduces heat generation, improves voltage regulation, and enhances transient response characteristics. No circuit modifications are required.

Q: Are both parts suitable for the same temperature operating range?

A: The 108SML004MD8 operates from -40°C to 85°C. The 108AXZ6R3M extends this range to -55°C to 105°C. The substitute accommodates the original operating range and provides extended capability for more demanding thermal environments.

Q: What is the difference in ripple current handling between these parts?

A: At 100 kHz, 108AXZ6R3M handles 600 mA compared to 108SML004MD8's 450 mA. At 120 Hz, both handle 300 mA. Higher ripple current capability reduces thermal stress in high-frequency switching applications.

Q: Are there packaging differences between these parts?

A: The 108SML004MD8 is supplied in standard packaging, while 108AXZ6R3M is supplied in Tape & Reel (TR) format. Both are surface mount radial can packages with identical mechanical specifications. Tape & Reel packaging is standard for automated assembly processes.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 Compliant, REACH Unaffected, and carry identical MSL rating of 1 (Unlimited). Regulatory and manufacturing process requirements are equivalent.

Q: What is the lifetime specification difference?

A: Both parts specify 2000 hours lifetime. The 108SML004MD8 is rated at 85°C, while 108AXZ6R3M is rated at 105°C. The substitute maintains the same lifetime specification at a higher temperature, indicating improved thermal performance.