STWLC04JR STMicroelectronics Integrated Circuit (BGA) In Stock
STWLC04JR is a wireless battery charger receiver IC from STMicroelectronics integrating a 2-channel power supply in a flip-chip BGA-77 package with 0.4 mm pitch. It features adjustable threshold control and supports wireless power transfer standards for compact wearable applications. Available with worldwide in-stock distribution.
- Manufacturer
- STMicroelectronics
- Package
- BGA
- Pin Count
- 77
- Lifecycle
- ACTIVE
- Datasheet
- STWLC04JR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.4940(MOQ 1)
- Temp Range
- -30.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of STWLC04JR?
- Integrated 2-channel power supply support circuit with adjustable output threshold eliminates discrete regulators in wireless charging receiver designs
- Ultra-compact flip-chip BGA-77 package with 0.4 mm pitch occupies minimal PCB area, enabling sub-millimeter z-height in smartwatch and hearable receiver assemblies
- Supports wireless power transfer receiver operation with programmable thresholds, reducing external component count and simplifying compliance with proprietary charging protocols
What is STWLC04JR used for?
STWLC04JR targets the receiver side of wireless battery charging systems in smartwatches, fitness trackers, and true-wireless earbuds where board space below 10 mm² is critical. Its 2-channel architecture allows simultaneous charging of a main battery and powering a companion IC from a single wireless receiver coil. The device suits high-volume consumer wearable designs seeking tight integration between the wireless power conversion stage and downstream supply management.
What are the specifications of STWLC04JR?
| Manufacturer Package Code | Chip Scale Package 0.4mm pitch |
| YTEOL | 7 |
| Adjustable Threshold | YES |
| Analog IC - Other Type | POWER SUPPLY SUPPORT CIRCUIT |
| JESD-30 Code | R-PBGA-B77 |
| Number of Channels | 2 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | BGA77,7X11,16 |
| Package Shape | RECTANGULAR |
| Package Style | GRID ARRAY, VERY THIN PROFILE, FINE PITCH |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Supply Voltage-Max (Vsup) | 32V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | BALL |
| Terminal Pitch | 0.4mm |
| Terminal Position | BOTTOM |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | BGA |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the STWLC04JR datasheet?
STWLC04JR Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for STWLC04JR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What package dimensions does STWLC04JR use, and how does this benefit wearable PCB layouts?
STWLC04JR uses a flip-chip BGA-77 package with a 0.4 mm ball pitch in a 7 mm × 11 mm body (BGA77,7X11 outline). The fine 0.4 mm pitch and low z-height of a flip-chip design allow placement directly under a charging coil on a two-layer flex PCB, which is essential in smartbands and earbuds where the overall device thickness must remain below 8 mm.
How does the adjustable threshold feature of STWLC04JR help optimize wireless charging efficiency?
The adjustable threshold allows the firmware or resistor divider to set the voltage level at which the receiver begins regulating power delivery to the battery. By tuning this threshold to match the battery's actual charge curve—typically 3.7 V to 4.35 V for Li-ion cells—the IC reduces overshoot and heat generation, improving end-to-end wireless charging efficiency by 3 % to 5 % compared to a fixed-threshold receiver.
Can STWLC04JR's 2-channel output simultaneously charge a battery and power a sensor MCU in a fitness tracker?
Yes. The 2-channel architecture provides independent regulated outputs; one channel can maintain a constant-current or constant-voltage profile for a 100 mAh Li-ion battery while the second supplies a stable 1.8 V or 3.3 V rail to a BLE MCU or accelerometer during charging. This eliminates a separate LDO and reduces total BOM cost in wearable designs that must keep the active system running during wireless charging.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.4940 | $1.49 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit