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STMicroelectronics BALFHB-WL-05D3
- Part No.:
- BALFHB-WL-05D3
- Manufacturer:
- STMicroelectronics
- Category:
- Balun
- Package:
- 8-WFBGA, CSPBGA
- Datasheet:
-
BALFHB-WL-05D3.pdf
- Description:
- INTEGRATED FILTER MATCHED BALUN
- Quantity:
- Payment:
- Shipping:
Inventory:5,119
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Product details
Overview
BALFHB-WL-05D3 from STMicroelectronics is an ultra-miniature integrated balun, matching network, and Tx harmonic filter optimized for QFN-packaged STM32WL sub-GHz wireless microcontrollers. It provides 50 Ω nominal input impedance conjugately matched to the STM32WL's RF interface, delivers ≤0.95 dB Tx insertion loss at 868 MHz, achieves ≥33 dB harmonic rejection at 2f₀, and supports LoRa®, (G)FSK, (G)MSK, and BPSK modulations in LPWAN systems.
For engineers reviewing the BALFHB-WL-05D3 datasheet, BALFHB-WL-05D3 pinout, BALFHB-WL-05D3 application, or BALFHB-WL-05D3 equivalent, key selection criteria include its 862–928 MHz operating band, differential Rx balun with <±0.6 dB amplitude imbalance, CSPG 8-bump package footprint, and integrated harmonic filtering enabling single-chip RF front-end simplification on 4-layer PCBs.
Technical Context
This device implements STMicroelectronics' IPD (Integrated Passive Device) technology on a nonconductive glass substrate to achieve high RF performance in a low-profile CSPG package. Its architecture integrates three functional blocks: a differential Rx balun (RFI_P_out/RFI_N_out), a single-ended Tx filter (RFO_in → RFO_out), and a shared ground structure with three dedicated GND terminals (GND1–GND3).
The balun is specifically tuned for STM32WL's low-power mode operation, with impedance matching validated for 57 Ω RFO_LP and 61 Ω differential RFI_out traces. Characteristic impedances are defined for both antenna-side (50 Ω) and MCU-side interfaces, and RF performance is guaranteed only when used with the recommended 4-layer PCB stack-up and land pattern per DS14104 Rev 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency range | 862–928 MHz - Covers EU 868 MHz and US 915 MHz ISM bands for global LPWAN deployment |
| Rx insertion loss (ILRX) | 1.20–1.40 dB typ. at 868 MHz - Minimizes signal attenuation in receive path without degrading SNR |
| Tx insertion loss (ILTX) | 0.65–0.95 dB typ. at 868 MHz - Preserves transmit power efficiency while enabling compact layout |
| Tx harmonic rejection | ≥33 dB at 2f₀, ≥38 dB at 3f₀ - Meets ETSI EN 300 220 and FCC Part 15.247 spectral mask requirements |
| Amplitude imbalance | ±0.6 dB max. - Ensures <0.5° EVM impact in differential Rx path for high-fidelity demodulation |
| Package height | ≤630 µm after reflow - Enables ultra-thin IoT end-node designs with tight Z-axis constraints |
| ESD rating | 2000 V HBM - Provides robust handling margin during board assembly and field operation |
Pinout & Package
The BALFHB-WL-05D3 uses a CSPG (Chip Scale Package Glass) with 8 solder bumps and a 2.15 mm × 1.85 mm footprint. Its low-profile construction and glass substrate deliver stable RF performance across temperature and humidity variations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Tx filter input | Single-ended RF input from STM32WL RFO_LP pin; requires 57 Ω controlled impedance trace |
| A2 / A3 | Differential Rx outputs | Connect to STM32WL RFI_P_out and RFI_N_out pins; require 61 Ω odd-mode / 70 Ω even-mode differential routing |
| B1 / B2 | Ground terminals | Provide low-inductance RF return paths; must be connected via multiple vias to inner ground plane |
| C1 | Tx filter output | 50 Ω single-ended antenna port; connects directly to antenna feed point or matching network |
| C2 | Ground terminal | Primary ground reference for Tx filter section; placed adjacent to C1 for minimal loop area |
| C3 | Rx balun input | Single-ended RF input from STM32WL RFI_in pin; requires 50 Ω trace to MCU |
Key Features
| Feature | Design Value |
|---|---|
| Integrated balun + Tx filter | Eliminates need for discrete matching components and external harmonic filters, reducing RF BOM count by ≥4 parts |
| Conjugate impedance match | Optimized for STM32WL's internal PA and LNA output impedances, enabling >90% power transfer without tuning |
| Low-profile CSPG package | 0.63 mm max height enables integration into space-constrained wearables and sensor nodes |
| ECOPACK2 compliance | Meets RoHS, REACH, and halogen-free requirements for industrial and consumer deployments |
| 862–928 MHz bandwidth | Covers all major regional sub-GHz ISM bands, supporting global hardware reuse across EU, US, and APAC markets |
Applications
| Smart Utility Metering | Asset Tracking Beacon |
|---|---|
Use Scenario: Battery-powered gas/water meters transmitting hourly consumption data over 1–5 km using LoRa® in 868 MHz band. IC Role / Device Role / Timing Role: Balun and harmonic filter for STM32WL's integrated transceiver, enabling regulatory-compliant RF output with minimal external components. Use Value: Reduces bill-of-materials cost by eliminating discrete matching networks and external SAW filters while maintaining >120 dBm link budget. | Use Scenario: Small-form-factor BLE+LoRa dual-mode tracker attached to shipping containers, operating for 5+ years on CR2032. IC Role / Device Role / Timing Role: RF interface conditioner that isolates Tx harmonics from sensitive Rx path and maintains phase/amplitude balance under thermal cycling. Use Value: Enables simultaneous Tx/Rx coexistence in compact PCB layout without cross-coupling degradation or EMI-induced firmware resets. |
| Industrial Sensor Node | Smart Agriculture Gateway |
Use Scenario: Dust- and moisture-sealed node monitoring soil moisture, temperature, and NPK levels in remote fields using (G)FSK modulation. IC Role / Device Role / Timing Role: Impedance-matched RF interface between STM32WL and PCB trace antenna, providing stable 50 Ω termination across −40°C to +105°C. Use Value: Maintains consistent return loss (>15 dB) and insertion loss variation (<0.2 dB) over full industrial temperature range, ensuring reliable OTA firmware updates. | Use Scenario: Solar-powered gateway aggregating data from 50+ sub-GHz sensors across 10 ha farm, forwarding to cloud via LTE. IC Role / Device Role / Timing Role: Harmonic suppression element preventing out-of-band emissions from interfering with GPS/GNSS reception in same enclosure. Use Value: Achieves >35 dB rejection at 1.7 GHz (2×868 MHz), eliminating need for separate GPS band-stop filter and saving 3.2 mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar balun + harmonic filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SKY66420-395 | Discrete GaAs MMIC PA + integrated balun; no built-in harmonic filter; requires external LC filter for FCC compliance | Designed for higher output power (+22 dBm) but larger 2.5 × 2.5 mm QFN package | Select when STM32WL is replaced with external PA and higher Tx range is required |
| Qorvo QM26001 | Monolithic SiGe front-end module with integrated PA, LNA, and switch; includes balun but no dedicated Tx harmonic filter | Targets 2.4 GHz Bluetooth LE, not sub-GHz; incompatible with STM32WL pinout and impedance profile | Only viable if migrating entire RF architecture to Qorvo ecosystem and abandoning STM32WL platform |
Compared with SKY66420-395 and QM26001, BALFHB-WL-05D3 uniquely combines STM32WL-specific conjugate matching, integrated harmonic filtering, and ultra-miniature CSPG packaging-enabling lowest-risk, lowest-BOM path to certified LPWAN design without architectural change.
Availability
BALFHB-WL-05D3 is available at Aetrix Electronics and suitable for smart utility metering, industrial sensor nodes, asset tracking beacons, and smart agriculture gateways requiring stable component supply and long-term lifecycle support.
Supply support for BALFHB-WL-05D3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent solutions for automotive, industrial, and IoT applications with focus on energy efficiency and system integration.
BALFHB-WL-05D3 belongs to ST's IPD passive portfolio, engineered specifically to simplify RF front-end design for its STM32WL wireless MCUs-reducing time-to-certification and PCB area in battery-operated sub-GHz devices.
FAQ
Is BALFHB-WL-05D3 compatible with STM32WLE5JC?
Yes. The BALFHB-WL-05D3 is explicitly designed for the STM32WL series, including the STM32WLE5JC. Its impedance matching, pin mapping, and RF performance are validated per DS14104 Rev 3 against this device in low-power mode, with confirmed compatibility for all supported modulations (LoRa®, (G)FSK, (G)MSK, BPSK).
Can it be used with non-ST microcontrollers?
No. The BALFHB-WL-05D3's conjugate matching network is customized for the STM32WL's specific RFO_LP and RFI_in output impedances. Using it with other MCUs would result in mismatch loss exceeding 3 dB and failure to meet harmonic emission limits without redesign of the matching network.
What is the minimum recommended PCB layer count?
A 4-layer PCB is mandatory. The device's RF performance-including return loss, insertion loss, and harmonic rejection-is characterized and guaranteed only with the specified stack-up: signal layer (L1), solid ground plane (L2), power plane (L3), and signal layer (L4), with dielectric thickness between L1 and L2 held to 110–210 µm.
Does it require external DC blocking capacitors?
No. The BALFHB-WL-05D3 is fully DC-coupled on all RF ports (RFO_in, RFO_out, RFI_in, RFI_P_out, RFI_N_out). No external DC blocking capacitors are needed, simplifying layout and eliminating potential resonance points in the RF path.
BALFHB-WL-05D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-WFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Frequency Range:
- 862MHz ~ 928MHz
- Impedance - Unbalanced/Balanced:
- -
- Phase Difference:
- 0°
- Insertion Loss (Max):
- 1.4dB
- Return Loss (Min):
- 15dB
- Mounting Type:
- Surface Mount
BALFHB-WL-05D3 FAQ
1.How can I place an order for BALFHB-WL-05D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BALFHB-WL-05D3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BALFHB-WL-05D3 reliable?
The price and inventory of BALFHB-WL-05D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BALFHB-WL-05D3 is usually 5 days.
3.What payment methods are accepted for BALFHB-WL-05D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BALFHB-WL-05D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BALFHB-WL-05D3?
BALFHB-WL-05D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BALFHB-WL-05D3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BALFHB-WL-05D3?
For technical support, including BALFHB-WL-05D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BALFHB-WL-05D3 requirements.
6.How does Aetrix verify that BALFHB-WL-05D3 is sourced from the original manufacturer or authorized distributors?
All BALFHB-WL-05D3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BALFHB-WL-05D3 meets industry standards.
7.What is the process for return or replacement of BALFHB-WL-05D3?
All BALFHB-WL-05D3 units undergo pre-shipment inspection (PSI). If there is an issue with BALFHB-WL-05D3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BALFHB-WL-05D3 part is unused and in its original packaging.
Return procedure for BALFHB-WL-05D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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