KEMET T491A474M025AT4153

Introduction to the KEMET T491A474M025AT4153 Product

The KEMET T491A474M025AT4153 represents an industrial-grade, molded surface mount tantalum capacitor tailored to meet the requirements of rigorous automated production lines. Originating from the reputable T491 series, this device is engineered for general purpose filtering and decoupling in power management and signal processing circuits. The T491A474M025AT4153 model comes in a compact 1206 package (3.2 mm × 1.6 mm metric footprint), offering a rated capacitance of 0.47 µF, a voltage rating of 25 VDC, and a standard tolerance of ±20%. With a seated height of 1.8 mm and robust MnO₂ construction, the device ensures mechanical reliability, making it suitable for densely populated circuit boards in industrial and consumer electronics alike.

Main Features and Advantages of the KEMET T491A474M025AT4153

Central to the T491A series is the fusion of KEMET's mature solid tantalum technology and high-reliability manufacturing processes. The capacitor is compliant with EIA Standard 535BAAC, underscoring its pedigree in quality and performance. Among its standout features are symmetrical terminations suitable for automated placement, a halogen-free, UL94 V-0 compliant epoxy encapsulant, and optional gold, matte tin, or tin-lead terminations to support a variety of soldering and attachment processes. Enhanced by laser marking for dependable traceability and 100% surge current testing on selected case sizes, the T491A474M025AT4153 simplifies inventory management and process integration. Its wide operating temperature range (-55°C to +125°C) and 2000-hour lifetime at maximum rated temperature signal robustness under challenging environmental conditions.

Technical Data and Details of the KEMET T491A474M025AT4153

The electrical and mechanical attributes of the KEMET T491A474M025AT4153 specify its utility for a broad spectrum of designs. Key characteristics include:

– Capacitance: 0.47 µF

– Voltage Rating: 25 VDC

– Tolerance: ±20%

– ESR: 130 Ω

– Case Size: 1206 (3.2 × 1.6 mm)

– Rated Lifetime: 2000 hours at 125°C

– Mounting: Surface-mount (SMT) compatible

– Moisture Sensitivity Level: MSL 1 (unlimited floor life)

– RoHS and REACH compliant construction

The part carries KEMET's 'A' size code and is designed for low-profile, high-density applications, with extended value ranges available throughout the T491 series. The typical physical dimensions and lead spacing allow easy placement using standard SMT machinery, and the preferred packaging method—Tape & Reel per EIA 481—supports high-volume automation.

Usage Examples of the KEMET T491A474M025AT4153

The T491A474M025AT4153 finds application as a reliable decoupling and filtering element across various devices demanding stable, pulse-handling capacitance. Notable deployment contexts include DC/DC converter modules, portable electronics, communications equipment, and control units in factory automation. Its surface-mount format lends itself to miniaturized and multi-layer PCB architectures. The device's characteristic stability across temperature and bias conditions ensures consistent system performance in both consumer and industrial environments.

Performance Attributes and Design Guidelines for the KEMET T491A474M025AT4153

For engineers, understanding the capacitor’s performance metrics—such as ESR behavior versus frequency and allowable ripple current—is critical. The T491A474M025AT4153 is engineered to tolerate defined ripple currents/voltages within the context of its thermal and electrical limits; excessive peak voltages or continuous reverse polarity may damage the device, necessitating prudent circuit design. Environmental derating is advised to maintain reliability; for instance, operating temperatures approaching the upper limit should prompt designers to apply compensation factors to maximum power dissipation ratings. KEMET’s K-SIM online simulation tool can be leveraged to analyze the device’s behavior with respect to DC bias, frequency response, and ambient conditions, supporting rigorous system design validation.

Soldering, Installation and Storage Recommendations for KEMET T491A474M025AT4153

Integration into SMT assemblies requires adherence to recommended soldering profiles (convection, IR, vapor phase, or wave) per IPC/J-STD-020D standards. Preheating is advised to mitigate thermal shock, and the component is rated for three reflow passes. Hand soldering is permitted with process control care—specifically, heating pads rather than the capacitor body to avoid encapsulant damage. Storage should be in controlled environments: <40°C, <60% RH, and free of corrosive agents; KEMET suggests consumption of existing stock within three years to ensure solderability.

Environmental Standards and Reliability of KEMET T491A474M025AT4153

The T491A474M025AT4153 is RoHS-compliant and halogen-free, with epoxy materials meeting UL94 V-0 flame resistance and ASTM E595 outgassing standards. This makes it a responsible choice for designs requiring strict material safety and compliance. Its industrial grade MnO₂ cathode structure enables long-term stability even in settings with elevated humidity or temperature extremes.

Packaging and Logistics Details for KEMET T491A474M025AT4153

KEMET applies EIA Standard 481 packaging, using 8 mm and 12 mm carrier tape on 7" and 13" reels for the T491A474M025AT4153. This arrangement guarantees compatibility with automated pick-and-place equipment and secure shipment. The packaging ensures proper orientation, minimal rotation and lateral movement risk, robust peel strength, and industry-standard traceability via bar code labeling, supporting lean manufacturing logistics and defect-free assembly.

Alternative or Substitute Models for KEMET T491A474M025AT4153

When evaluating the KEMET T491A474M025AT4153 for substitution or cross-reference, engineers may consider other options within the T491 series—such as alternative capacitance, tolerance, ESR, or voltage ratings available in the same form factor. Variants with tighter tolerances (±10%), different termination finishes (gold, non-magnetic tin, or traditional tin-lead), and higher voltage ratings may be selected to meet more demanding electrical or reliability requirements. It is essential to review the compatibility with existing land patterns and performance envelopes before making substitutions.

Conclusion

: Selecting the KEMET T491A474M025AT4153 for Modern Electronic Systems

The KEMET T491A474M025AT4153 stands as a robust, high-quality tantalum surface mount capacitor designed for reliability, safety, and compatibility with automated electronic assembly. Its feature set, compliance credentials, and performance profile make it an attractive solution for engineers and procurement specialists seeking proven filtering or decoupling capacity in compact SMT designs. Careful attention to specification, mounting, and operating limits will ensure optimal device performance and lifecycle, making the T491A474M025AT4153 a staple choice for next-generation electronic applications.