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Equivalent & Substitute Parts for T491B107M004AS
Part Overview
The T491B107M004AS is a 100 µF molded tantalum capacitor manufactured by KEMET, rated for 4 V operation in a 1411 (3528 Metric) surface mount package. This component is classified as obsolete product status. Due to its obsolete designation, direct replacement with active production alternatives is necessary for new designs and ongoing procurement requirements. The substitute parts listed maintain electrical and mechanical compatibility while offering active product status and improved availability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Capacitance | 100 | µF |
| Voltage - Rated | 4 | V |
| Tolerance | ±20% | — |
| Type | Molded Tantalum | — |
| Package / Case | 1411 (3528 Metric) | — |
| Size / Dimension | 0.138" L x 0.110" W (3.50mm x 2.80mm) | — |
| Height - Seated (Max) | 0.083" (2.10mm) | — |
| ESR (Equivalent Series Resistance) | 900 | mOhm |
| Operating Temperature | -55°C ~ 125°C | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the T491B107M004AS is determined by the following mandatory parameters:
Primary Compatibility Criteria:
- Capacitance: 100 µF (exact match required)
- Voltage - Rated: 4 V (exact match required)
- Package / Case: 1411 (3528 Metric) (exact match required)
- Mounting Type: Surface Mount (exact match required)
- Operating Temperature Range: -55°C ~ 125°C (exact match required)
Secondary Compatibility Parameters:
- Tolerance: ±20% (exact match) or tighter tolerance acceptable
- Type: Molded Tantalum (exact match required)
- RoHS Status: ROHS3 Compliant (exact match required)
- Moisture Sensitivity Level: 1 (Unlimited) (exact match required)
Variable Parameters (Non-Critical for Substitution):
- ESR (Equivalent Series Resistance): May vary within acceptable operating ranges
- Manufacturer: Different manufacturers acceptable if all primary criteria met
- Product Status: Active status preferred over obsolete
- Packaging Format: Tape & Reel (TR) or Cut Tape (CT) acceptable for procurement flexibility
Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (same manufacturer, active status) and Cross-Manufacturer Equivalents (alternative manufacturers, identical electrical and mechanical specifications).
Parameter Comparison
| Part Number | Manufacturer | Capacitance (µF) | Voltage (V) | Tolerance | Package | ESR (mOhm) | Height Max (mm) | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| T491B107M004AS | KEMET | 100 | 4 | ±20% | 1411 (3528) | 900 | 2.10 | Obsolete | — |
| T491B107M004AT | KEMET | 100 | 4 | ±20% | 1411 (3528) | 900 | 2.10 | Active | Tape & Reel |
| T494B107M004AT | KEMET | 100 | 4 | ±20% | 1411 (3528) | 650 | 2.10 | Active | Tape & Reel |
| T494T107M004AT | KEMET | 100 | 4 | ±20% | 1411 (3528) | 4.5 | 1.20 | Active | Tape & Reel |
| F930G107KBA | KYOCERA AVX | 100 | 4 | ±10% | 1411 (3528) | 900 | 2.30 | Active | Tape & Reel |
| F930G107MBA | KYOCERA AVX | 100 | 4 | ±20% | 1411 (3528) | 900 | 2.30 | Active | Cut Tape & Digi-Reel |
| F930J107KBA | KYOCERA AVX | 100 | 6.3 | ±10% | 1411 (3528) | 900 | 2.30 | Active | Tape & Reel |
| TAJB107M004RNJ | KYOCERA AVX | 100 | 4 | ±20% | 1411 (3528) | 900 | 2.10 | Active | Tape & Reel |
| TAJT107M004RNJ | KYOCERA AVX | 100 | 4 | ±20% | 1411 (3528) | 1.4 | 1.20 | Active | Tape & Reel |
| 293D107X0004B2TE3 | Vishay Sprague | 100 | 4 | ±20% | 1411 (3528) | 1.8 | 2.11 | Active | Tape & Reel |
| 593D107X0004B2TE3 | Vishay Sprague | 100 | 4 | ±20% | 1411 (3528) | 450 | 2.11 | Active | Tape & Reel |
Engineering Selection Recommendations
Primary Recommendation: T491B107M004AT
The T491B107M004AT is the direct equivalent from KEMET. It maintains identical electrical specifications (100 µF, 4 V, ±20% tolerance, 900 mOhm ESR) and mechanical dimensions (1411 package, 2.10 mm height) as the obsolete T491B107M004AS. Product status is active with 2000 Hrs @ 125°C lifetime rating. RoHS3 compliance and MSL 1 rating are maintained. This part provides the most direct replacement path with no design modifications required.
Secondary Recommendation: T494B107M004AT
The T494B107M004AT offers improved performance through reduced ESR (650 mOhm versus 900 mOhm). All other electrical parameters remain identical. Mechanical compatibility is maintained. Active product status with 2000 Hrs @ 125°C lifetime. Selection of this part is appropriate when lower ESR performance is beneficial to circuit operation.
Alternative Recommendation: TAJB107M004RNJ (KYOCERA AVX)
The TAJB107M004RNJ provides cross-manufacturer equivalence with identical electrical specifications and mechanical dimensions. ESR matches the original part at 900 mOhm. Active product status with high inventory availability (25,300 Pcs). RoHS3 and MSL 1 compliance maintained. This part is suitable when supply chain diversification or cost optimization is required.
Performance-Enhanced Option: TAJT107M004RNJ
The TAJT107M004RNJ offers significantly reduced ESR (1.4 Ohm) and lower profile height (1.20 mm). Electrical ratings remain identical. Active product status. Selection appropriate for applications requiring improved high-frequency performance or space-constrained designs.
Note on F930J107KBA:
The F930J107KBA operates at 6.3 V rated voltage, exceeding the 4 V requirement of the original part. While mechanically compatible and electrically functional in 4 V circuits, this part is not a direct substitute due to voltage rating mismatch. Use only when higher voltage rating is required by circuit design.
Frequently Asked Questions (FAQ)
Q: Can I use F930J107KBA as a direct replacement for T491B107M004AS?
A: F930J107KBA is not a direct substitute. While it maintains the same capacitance (100 µF), package (1411), and physical dimensions, the rated voltage is 6.3 V instead of 4 V. The part will function in a 4 V circuit, but the voltage rating mismatch disqualifies it as a true equivalent. Use only when circuit design specifically requires higher voltage rating.
Q: What is the difference between T491B107M004AT and T494B107M004AT?
A: Both parts are KEMET 100 µF, 4 V molded tantalum capacitors in 1411 package with identical dimensions. The primary difference is ESR: T491B107M004AT has 900 mOhm ESR, while T494B107M004AT has 650 mOhm ESR. The lower ESR of T494B107M004AT provides improved high-frequency performance and reduced heat generation. Both are active products with identical compliance ratings.
Q: Are KYOCERA AVX parts (TAJ series) compatible with KEMET T491/T494 parts?
A: Yes. TAJB107M004RNJ and TAJT107M004RNJ are cross-manufacturer equivalents that maintain identical electrical specifications (100 µF, 4 V, ±20% tolerance) and mechanical compatibility (1411 package, surface mount). All parts meet RoHS3 and MSL 1 requirements. Selection between manufacturers is based on supply availability and cost considerations.
Q: What does ESR variation mean for my circuit?
A: ESR (Equivalent Series Resistance) affects impedance at high frequencies and heat dissipation. Lower ESR values (1.4 Ohm to 450 mOhm) provide better high-frequency performance and reduced ripple current heating. Higher ESR values (900 mOhm) are acceptable for general-purpose applications. Selection depends on circuit frequency requirements and thermal constraints.
Q: Can I substitute parts with different tolerances?
A: The original part specifies ±20% tolerance. Parts with tighter tolerance (±10%, such as F930G107KBA) are acceptable substitutes as they provide improved accuracy. Parts with looser tolerance are not recommended. Tolerance selection depends on circuit accuracy requirements.
Q: What is the significance of MSL 1 rating?
A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture baking requirements. All listed substitute parts carry MSL 1 rating, meaning they can be stored and handled without special moisture control procedures. This simplifies procurement and inventory management.
Q: Are there height restrictions I should consider?
A: The original T491B107M004AS has maximum seated height of 2.10 mm. Most substitutes maintain this height. However, T494T107M004AT and TAJT107M004RNJ offer reduced height (1.20 mm), beneficial for space-constrained designs. F930G107KBA, F930G107MBA, and F930J107KBA have slightly increased height (2.30-2.31 mm). Verify PCB clearance requirements before selection.
Q: What packaging options are available?
A: Substitute parts are available in Tape & Reel (TR) format for automated assembly, or Cut Tape (CT) & Digi-Reel format for manual handling. Selection depends on manufacturing process requirements. All formats maintain identical electrical and mechanical specifications.
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