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The 919AS-100M=P3 is a surface-mount inductor manufactured by TOKO. Below are its specifications, descriptions, and features:

Specifications:

• Inductance: 10 μH (microhenries)
• Tolerance: ±20%
• DC Resistance (DCR): 0.24 Ω (ohms) (typical)
• Rated Current: 100 mA
• Saturation Current: 130 mA (typical)
• Operating Temperature Range: -40°C to +85°C
• Package Type: SMD (Surface Mount Device)
• Dimensions (L x W x H): 4.5 mm x 3.2 mm x 1.9 mm

Descriptions:

• Designed for high-frequency filtering and power supply applications.
• Suitable for DC-DC converters, voltage regulators, and noise suppression circuits.
• Compact SMD form factor for space-constrained PCB designs.

Features:

• Shielded construction for reduced electromagnetic interference (EMI).
• High reliability with stable inductance over temperature variations.
• RoHS compliant, ensuring environmental safety.

This inductor is commonly used in consumer electronics, telecommunications, and automotive applications.

(Note: Always verify datasheet details for exact application requirements.)

# Technical Analysis of TOKO 919AS-100M=P3 Inductor

## 1. Practical Application Scenarios

The TOKO 919AS-100M=P3 is a surface-mount power inductor designed for high-frequency filtering and energy storage in compact electronic circuits. Key applications include:

Power Supply Noise Suppression

The inductor is widely used in switch-mode power supplies (SMPS) to attenuate high-frequency noise, particularly in DC-DC converters. Its 10 µH inductance and low DC resistance (DCR) make it suitable for suppressing ripple currents in buck/boost topologies.

RF and Communication Circuits

In RF modules and wireless communication devices, the 919AS-100M=P3 acts as a choke to block unwanted high-frequency interference while allowing DC or low-frequency signals to pass. Its stable inductance over temperature variations ensures reliable performance in 5G, Wi-Fi, and IoT applications.

Automotive Electronics

Due to its robust construction, this inductor is employed in automotive power management systems, such as infotainment and ADAS modules, where vibration resistance and thermal stability are critical.

Consumer Electronics

The component is found in smartphones, tablets, and wearables, where space constraints demand high-efficiency, miniaturized inductors for voltage regulation and EMI suppression.

## 2. Common Design-Phase Pitfalls and Avoidance Strategies

Saturation Current Miscalculation

Designers may overlook the inductor’s saturation current (Isat), leading to core saturation under high load conditions. This reduces efficiency and can cause overheating.

Mitigation: Verify the peak current in the application does not exceed the specified Isat (e.g., 1.2 A for the 919AS-100M=P3). Use simulation tools to model transient loads.

Thermal Management Neglect

Insufficient thermal planning can degrade performance, especially in high-ambient-temperature environments.

Mitigation: Ensure adequate PCB copper pours or heatsinking near the inductor. Monitor temperature rise during prototyping.

Incorrect Footprint Implementation

Misalignment or improper pad sizing can lead to soldering defects or mechanical stress.

Mitigation: Follow the manufacturer’s recommended land pattern and reflow profile to prevent tombstoning or cold joints.

EMI Interference Due to Layout

Poor placement near sensitive traces or high-speed signals can introduce coupling noise.

Mitigation: Position the inductor away from high-frequency lines and use ground shielding if necessary.

## 3. Key Technical Considerations for Implementation

• Frequency Response: The 919AS-100M=P3 operates optimally in the 1–10 MHz range. Beyond this, parasitic effects may degrade performance.
• DCR Impact: The low DCR (~0.15 Ω) minimizes power loss but must be balanced against size constraints.
• Automated Assembly Compatibility: The component is compatible with standard pick-and-place and reflow processes, but moisture sensitivity (MSL rating) should be observed.

By addressing these factors, designers can maximize the reliability and efficiency of the 919AS-100M=P3 in their applications.