EASTERN Inductor SMD: Datasheet, Specifications, Applications & Selection Tips for Compact Circuits
1. EASTERN Inductor SMD: Datasheet Overview
The EASTERN Inductor SMD datasheet is a critical resource for engineers, providing electrical, mechanical, and environmental specifications. Below are key parameters from a typical 10uH SMD model (e.g., EASTERN L1005-100K):
| Parameter | Specification | Significance |
|---|---|---|
| Inductance (L) | 10μH ±2% (at 100kHz, 0.1A) | Defines energy storage capacity; critical for frequency tuning in filters and oscillators. |
| Q Factor | ≥45 (at 100kHz, 0.1A) | Measures efficiency; higher Q reduces energy loss in RF and power circuits. |
| DC Resistance (DCR) | ≤0.2Ω (max) | Low DCR minimizes voltage drop, improving efficiency in 5V/3.3V power rails. |
| Current Rating | 1.2A (continuous), 2A (peak) | Maximum current before saturation; vital for power supply and motor control designs. |
| Operating Temperature | -40°C to +125°C | Ensures reliability in extreme environments (e.g., automotive underhood, industrial controls). |
| Package Size | 0805 (2.0mm × 1.25mm), 1206 (3.2mm × 1.6mm) | Compact sizes for space-constrained PCBs (e.g., wearables, IoT sensors). |
2. Key Specifications: Decoding 10uH–100uH SMD Inductors
EASTERN SMD inductors are available in a range of inductance values (10uH–100uH) and package sizes, each optimized for specific applications. Below are critical specifications and their impact:
2.1 Q Factor & Efficiency
A Q factor of ≥45 ensures minimal energy loss. For example, in a 1MHz RFID reader, a 10uH inductor with Q=45 reduces losses by 30% compared to a lower-Q inductor, extending battery life by 15–20%.
2.2 DC Resistance (DCR)
With DCR ≤0.2Ω, a 10uH inductor in a 5V/1A circuit introduces a voltage drop of $V_{drop} = I \times DCR = 0.1A \times 0.2Ω = 0.02V$, ensuring stable voltage for sensitive ICs like microcontrollers.
2.3 Current Rating & Saturation
A 1.2A continuous rating prevents saturation in 5V power supplies. Saturation (when the core can’t store more magnetic energy) causes inductance to drop sharply—for example, a 10uH inductor may lose 20% of its inductance at 1.5A, degrading filter performance.
3. Applications: Where SMD Inductors Excel in Compact Circuits
EASTERN SMD inductors’ small size and high efficiency make them ideal for compact PCBs. Below are common use cases with technical justification:
| Application | Inductor Size | Key Requirement | Example Circuit |
|---|---|---|---|
| Wearable Devices (Smartwatches) | 0805 (2.0mm × 1.25mm) | Low DCR, high Q for battery efficiency | Heart rate monitor power supply filter |
| Portable Power Supplies | 1206 (3.2mm × 1.6mm) | 1.2A current rating for 5V/2A outputs | USB-C charger DC-DC converter |
| RF Modules (Wi-Fi/Bluetooth) | 0805 | Q ≥45 for 2.4GHz signal integrity | Wi-Fi antenna matching network |
| Automotive Sensors | 1206 | -40°C to +125°C temperature range | Engine control unit (ECU) voltage regulator |
4. Selection Tips: Matching SMD Inductors to Your Design
Choosing the right EASTERN SMD inductor requires balancing size, power, and frequency. Use these tips to optimize your selection:
| Design Need | Recommendation | Example Model |
|---|---|---|
| Ultra-compact PCB (≤100mm²) | 0805 package (2.0mm × 1.25mm), 10uH–22uH | EASTERN L1005-100K (10uH, 0805) |
| High-current power supply (≥1A) | 1206 package (3.2mm × 1.6mm), 22uH–47uH, 1.5A+ rating | EASTERN L1206-220K (22uH, 1206) |
| High-frequency RF circuit (≥1MHz) | 0805 package, Q ≥60, low DCR (≤0.15Ω) | EASTERN L1005-100K-HQ (10uH, 0805, HQ) |
5. Common Problem: Overheating & Signal Loss in SMD Inductors
Compact SMD inductors often face two key issues: overheating at high currents and signal loss at high frequencies. Let’s examine a real-world scenario:
| Symptom | Root Cause | Example |
|---|---|---|
| PCB temperature rises by 15°C above ambient | Core hysteresis losses at high frequencies (≥500kHz). | A 10uH inductor in a 1MHz buck converter overheats, warping the PCB. |
| RF signal strength drops by 20% | Core saturation from excessive AC current (≥1.5A). | An RFID reader’s 10uH inductor loses 2μH at 2.4GHz, reducing read range by 30%. |
6. Solution: Optimizing SMD Inductors for Compact PCBs
Address overheating and signal loss with these strategies:
6.1 Use Shielded Core Inductors
Shielded models (e.g., EASTERN L1005-100K-SH) reduce electromagnetic interference (EMI) and core losses by 15–20% in high-frequency circuits, lowering operating temperature by 10–12°C.
6.2 Parallel a Bypass Capacitor
Add a 100pF ceramic capacitor in parallel to shunt high-frequency AC current. For a 1MHz circuit: $X_C = \frac{1}{2\pi f C} = \frac{1}{2\pi \times 1e6 \times 100e-12} ≈ 1.59kΩ$, reducing core losses and stabilizing inductance.
6.3 Select a Higher-Q Model
EASTERN’s high-Q inductors (Q ≥60) reduce losses by 30% in 1MHz applications. For example, the L1005-100K-HQ maintains 10uH ±2% at 1MHz, ensuring consistent filter performance.
| Problem | Solution | Outcome |
|---|---|---|
| Overheating in 1MHz buck converter | Shielded 10uH inductor + 100pF capacitor | Temperature rise reduced to 5°C; inductance stable at 10μH ±2%. |
| RFID read range degradation | Switch to Q=60 10uH inductor | Read range improves from 2m to 3.5m; signal loss minimized. |
The EASTERN Inductor SMD is a versatile, compact component that excels in modern electronics design. By understanding its datasheet, specifications, and application needs—and addressing challenges like overheating with targeted solutions—you can create efficient, reliable circuits for wearables, power supplies, and RF modules. Whether you’re a seasoned engineer or a hobbyist, this guide equips you to select and use EASTERN SMD inductors with confidence in your compact designs.
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