IWTX5547EEEB8R5KF1 - 8.5µH Wireless Charging Tx Coil | Vishay Dale
MPN: IWTX5547EEEB8R5KF1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.4 | $8.40 |
| 10 | $7.56 | $75.60 |
| 100 | $6.72 | $672.00 |
| 500 | $5.88 | $2,940.00 |
| 1,000 | $5.04 | $5,040.00 |
IWTX5547EEEB8R5KF1 Overview
A wireless charging transmitter coil (a Tx coil) is a flat wound inductor that converts high-frequency alternating current from a driver IC into an alternating magnetic field, which a corresponding receiver coil in a portable device converts back into DC power to charge a battery. Within the power management ecosystem, Tx coils sit between the DC-DC converter and the antenna stage; they are part of the inductive coupling subassembly that defines the Wireless Power Consortium's Qi standard interoperability envelope. The IWTX-family Mp = Wireless Charging Transmitter Coil, packaged as a self-shielded single-layer assembly with integrated ferrite backing, eliminates the need for a separate shield plate on the PCB.
Key specifications include an 8.5 µH nominal inductance designed for resonance in the 100-200 kHz Qi band, a Q factor reflecting the coil's low-loss winding, a 56 mΩ maximum DC resistance (DCR) that limits I²R losses at high currents, and a 5 W to 15 W power rating suitable for fast-charging smartphones and small electronics. The integrated magnetic shield reduces stray-field emissions, simplifying EMI compliance for Qi MP-A8 systems. Operating and storage temperature spans of -40 °C to +105 °C support automotive, industrial, and consumer environments. The coil's flat form factor and pre-attached shielding deliver consistent inductance and coupling distance without additional mechanical assembly.
Technically, the IWTX5547EEEB8R5KF1 employs a single-layer winding over a precision bobbin with a high-permeability ferrite backing plate. The pre-tuned inductance targets resonance with common Qi transmitter ICs, reducing matching network design effort. The integrated shield redirects magnetic flux downward toward the receiver and limits backward emission toward the PCB, which improves EMC margins and reduces coupling losses during misalignment.
Typical applications include Qi-compliant wireless charging transmitters for consumer smartphones and tablets, automotive in-cabin charging pads, medical and industrial handheld charging cradles, 5 W to 15 W wireless power reference designs, and Qi MP-A8 resonant transmitter modules. The coil is well-suited to designs that adopt WPC MP-A8 reference layouts.
When integrating this Tx coil, follow the recommended landing pattern, observe the minimum standoff distance to the receiver, and verify the matching network with the chosen transmitter IC. Adequate thermal management is required at 15 W continuous operation to keep the winding within its 40 °C temperature-rise rating.
This page synthesizes verified distributor pricing, drop-in same-family alternatives, and practical design considerations not commonly included in the manufacturer's two-page summary datasheet.
Drop-in alternatives for IWTX5547EEEB8R5KF1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
IWTX5547EEEB8R5KF2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
IWTX5547EEEB8R3KF1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
IWTX47R0EEEB8R5KF1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
IWTX5547EEEB8R5KF1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Vishay Dale |
| Series | IWTX |
| Product Type | Wireless Charging Transmitter Coil / Shield |
| Number of Coils | 1 |
| Number of Layers | 1 |
| Nominal Inductance | 8.5 µH |
| DC Resistance (Max) | 56 mΩ |
| Power Rating | 5 W to 15 W |
| Qi Standard Reference | Qi MP-A8 |
| Heat Rating Current | Based on 40 °C temperature rise |
| Saturation Current | Based on 10% inductance change |
| Humidity Range | 60% RH |
| Operating Temperature | -40 °C to +105 °C |
| Storage Temperature | -40 °C to +105 °C |
| Mounting Type | Surface Mount (PCB pad / adhesive) |
| RoHS Status | Compliant |
IWTX5547EEEB8R5KF1 Pin Configuration
| Pin 1 | Winding Lead 1 — Litz-wire termination for Tx tank circuit |
| Pin 2 | Winding Lead 2 — Litz-wire termination for Tx tank circuit |
| Pin 3 | Shield Ground Pad — Ferrite-shield GND connection (thermal/EMI pad) |
Typical Applications
IWTX5547EEEB8R5KF1 is suitable for 6 applications: Smartphone / Tablet Qi Charging Pad, Automotive In-Cabin Wireless Charger, Medical-Device Charging Cradle, Industrial / IoT Handheld Charger, Public Furniture / Furniture-Embedded Charging, Qi MP-A8 Reference / Evaluation Board.
Smartphone / Tablet Qi Charging Pad
The IWTX5547EEEB8R5KF1 serves as the Qi MP-A8 Tx coil in 5 W-to-15 W consumer charging pads for smartphones and tablets. Its 8.5 µH inductance resonates with all common Qi transmitter ICs (e.g., TI BQ500511, IDT P9235) in the 100-200 kHz band, simplifying matching-network design. The 56 mΩ DCR limits I²R losses, supporting the 15 W fast-charging envelope with realistic 85%+ efficiency. The integrated ferrite shield directs flux downward toward the receiver and reduces stray-field emissions, easing FCC/CE EMC compliance. Coil thermal margins (40 °C rise at rated power) sustain repetitive fast-charge sessions without derating. Used in desktop stands, multi-coil pads, and travel chargers.
Recommended
Automotive In-Cabin Wireless Charger
The IWTX5547EEEB8R5KF1 supports automotive center-console and armrest charging pods operating at -40 °C to +105 °C. Its Qi MP-A8 compliance interoperates with virtually every Qi phone on the market, while the integrated shield blocks magnetic-field leakage toward sensitive in-cabin electronics and wiring harnesses. With a 15 W upper power rating, the coil can deliver fast-charge to mid-tier phones and standard 5 W to legacy devices. The 56 mΩ DCR keeps I²R heating modest under continuous operation, important when the pad is buried in non-cooled console space. Designers pair it with automotive-grade Qi MCUs and FOD (foreign-object detection) ICs.
Recommended
Medical-Device Charging Cradle
Medical and industrial handhelds benefit from the IWTX5547EEEB8R5KF1 because it provides a sealed, contactless charging interface - critical in clinical environments where exposed charging pins can trap disinfectants or harbor contamination. The 8.5 µH inductance tunes to the Qi band, while the coil's 56 mΩ DCR supports low-power 5 W operation typical of medical devices such as blood-pressure monitors, infusion pumps, and diagnostic scanners. The -40 °C to +105 °C range also supports operation in cold storage or sterilizer-adjacent workflows. EMI shielding minimizes radiated emissions that could couple into sensitive bio-signal acquisition circuits.
Recommended
Industrial / IoT Handheld Charger
Industrial handheld scanners, ruggedized tablets, and IoT sensor hubs use the IWTX5547EEEB8R5KF1 as the Tx coil in charging cradles exposed to dust, vibration, and temperature swings. The flat PCB-mounted form factor integrates into sealed docking stations, while the integrated ferrite shield reduces edge-field emissions that can interfere with nearby RF modules such as Wi-Fi 6E or Bluetooth. The 56 mΩ DCR and 15 W power rating support fast-charging in factory-automation cells, and the -40 °C to +105 °C range ensures reliability in unconditioned shop-floor environments.
Recommended
Public Furniture / Furniture-Embedded Charging
Coffee-shop tables, airport lounges, and hotel-room desks integrate the IWTX5547EEEB8R5KF1 transmitter coil directly into furniture. The integrated ferrite shield limits stray-field leakage into furniture electronics (USB hubs, lighting controls) and reduces radiated emissions into the surrounding environment. The 8.5 µH inductance is Qi-compliant and interoperable across consumer devices, while the 15 W ceiling supports fast-charging service-tier customers. The 40 °C temperature-rise rating is conservative for high-traffic public installations.
Recommended
Qi MP-A8 Reference / Evaluation Board
Designers use the IWTX5547EEEB8R5KF1 in Qi MP-A8 reference designs and evaluation boards for fast-charging transmitters. The 8.5 µH inductance matches the WPC's reference matching network, enabling drop-in evaluation of receiver-side interoperability. Combined with Qi Tx controller ICs, the coil supports 5 W baseline, 7.5 W Apple, and 10-15 W Android fast-charging profiles. The integrated shield and proven 56 mΩ DCR make this coil a benchmark for new Qi transmitter designs, shortening hardware development cycles and WPC pre-compliance testing.
Recommended
Recommended Products Summary
Engineering reference data for IWTX5547EEEB8R5KF1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IWTX5547EEEB8R5KF2 | IWTX5547EEEB8R3KF1 | IWTX47R0EEEB8R5KF1 |
|---|---|---|---|---|
| Brand | Vishay Intertechnology | Vishay Intertechnology - same brand | Vishay Intertechnology - same brand | Vishay Intertechnology - same brand |
| Package | IWTX shielded coil (MP-A8 footprint) | IWTX shielded coil (MP-A8 footprint) - same | IWTX shielded coil (MP-A8 footprint) - same | IWTX shielded coil (MP-A8 footprint) - same |
| Nominal Inductance | 8.5 µH | 8.5 µH | 8.5 µH | 8.5 µH |
| DC Resistance (Max) | 56 mΩ | 56 mΩ | ~50 mΩ (-11%) | ≤56 mΩ |
| Power Rating | 5 W to 15 W | 5 W to 15 W | 5 W to 15 W | 5 W to 15 W |
| Qi Standard Reference | Qi MP-A8 | Qi MP-A8 | Qi MP-A8 | Qi MP-A8 |
| Integrated Shield | Yes (ferrite backed) | Yes (ferrite backed) | Yes (ferrite backed) | Yes (ferrite backed) |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C |
Key Differentiators
- Integrated ferrite shield eliminates separate shield plate (vs Discrete non-shielded 8.5 µH Tx coils)
- Qi MP-A8 reference compatibility (vs Non-MP-A8 8.5 µH Tx coils)
- Wide -40 °C to +105 °C temperature envelope (vs Consumer-grade coils rated 0 °C to +70 °C)
Design Notes
Place the IWTX5547EEEB8R5KF1 on a 2-oz copper landing pattern with sufficient clearance to surrounding ground pours, per the Vishay Dale MP-A8 reference layout. Maintain at least 5 mm of keep-out around the coil to prevent nearby ferrite or steel from shunting the magnetic flux. Verify the underside shield pad is electrically floating or grounded according to the chosen transmitter IC's EMI strategy.
Estimated: at 15 W continuous transmit power with 56 mΩ DCR, the coil dissipates roughly I²R loss (~0.22 W at 2 A_RMS) plus ferrite and eddy-current losses; total winding temperature rise is bounded to 40 °C above 25 °C ambient per the Vishay Dale 40 °C-rise spec. Avoid placing the coil directly over non-thermally-conductive housings; if the design operates near this 40 °C envelope, provide an aluminum or copper thermal spreader on the enclosure side to limit hotspot temperatures.
Do not route high-frequency digital or analog traces directly beneath the IWTX5547EEEB8R5KF1 - the shield reduces but does not eliminate cross-coupling. Verify foreign-object detection (FOD) thresholds with the chosen Tx IC, since coil-to-coil coupling varies with receiver alignment. When scaling to multi-coil arrays, ensure each coil meets the WPC spatial requirement for the chosen Qi version (BPP / EPP).
Compliance Information
RoHS compliant per Vishay Dale product page. The wireless charging coil itself is not AEC-Q100 qualified; AEC-Q100 qualification applies to active ICs, not passive coils. The coil supports automotive Qi charging pads when paired with an automotive-grade Qi Tx IC.