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STMicroelectronics BALF-SPI-02D3
- Part No.:
- BALF-SPI-02D3
- Manufacturer:
- STMicroelectronics
- Category:
- Balun
- Package:
- 6-WFBGA, FCBGA
- Datasheet:
-
BALF-SPI-02D3.pdf
- Description:
- BALUN 434MHZ 6WFBGA FCBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
BALF-SPI-02D3 from STMicroelectronics is an ultra-miniature flip-chip balun with integrated harmonic filter, designed specifically for impedance matching between the SPIRIT1 sub-GHz transceiver and a 50 Ω antenna interface at 434 MHz. It delivers −3.2 dB typical RX insertion loss, <1° phase imbalance, <1 dB amplitude imbalance, and −44 dB attenuation of 2nd harmonics, enabling compact, high-performance wireless sensor nodes in ISM-band applications.
For engineers reviewing the BALF-SPI-02D3 datasheet, BALF-SPI-02D3 pinout, BALF-SPI-02D3 application, or BALF-SPI-02D3 equivalent, key selection criteria include its 434 MHz conjugate match to SPIRIT1, 6-bump flip-chip package footprint (1.4 mm × 2.0 mm), integrated TX harmonic filtering, and verified RF performance across −40 °C to +85 °C operating temperature.
Technical Context
The BALF-SPI-02D3 implements a passive, monolithic balun-filter hybrid using ST's IPD technology on non-conductive glass substrate-enabling precise 50 Ω single-ended to differential conversion for SPIRIT1's RFN/RFP pins while suppressing harmonics up to 2fo. Its design eliminates discrete matching components and reduces layout sensitivity.
It operates exclusively in the 434 MHz ISM band with no tuning required; the conjugate match is fixed to SPIRIT1's internal output impedance, and harmonic filtering is embedded in the same die as the balun, ensuring co-located signal integrity without parasitic coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency | 434 MHz - optimized for European ISM band operation with ±10 MHz bandwidth |
| RX Insertion Loss | −3.2 dB typ - enables >90% RF power transfer from SPIRIT1 RX path to antenna |
| TX Harmonic Attenuation | −44 dB at 2fo - meets ETSI EN 300 220 spectral mask requirements without external filters |
| Phase Imbalance | ±10° max - preserves I/Q signal orthogonality critical for OOK/FSK demodulation fidelity |
| Amplitude Imbalance | ±1 dB max - maintains balanced differential signal swing for low-error-rate reception |
| Operating Temp | −40 °C to +85 °C - qualified for industrial-grade wireless sensor and metering deployments |
| ESD Rating | 2000 V HBM - protects against handling-induced discharge during PCB assembly |
Pinout & Package
Package: Flip-Chip 6-bump, 1.40 mm × 2.00 mm × 0.65 mm (typ), lead-free, ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RFIN (RX input) | Single-ended 50 Ω input from SPIRIT1 RX port; matched to ZIN ≈ 50 Ω |
| 2 | RFN (RX negative) | Differential output leg to SPIRIT1 RFN; forms balanced RX pair with Pin 3 |
| 3 | RFP (RX positive) | Differential output leg to SPIRIT1 RFP; conjugate-matched to internal transceiver impedance |
| 4 | ANT (antenna) | Single-ended 50 Ω antenna port; integrates harmonic filtering for TX path |
| 5 | GND | RF ground reference; requires dedicated low-inductance PCB ground plane under die |
| 6 | GND | Secondary RF ground; improves return path symmetry and reduces common-mode radiation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated balun + harmonic filter | Eliminates ≥4 discrete passives (inductors/capacitors) and saves >1.5 mm² PCB area |
| IPD-on-glass process | Enables tight impedance control and <0.3 dB process variation across wafer lots |
| Conjugate match to SPIRIT1 | Guarantees optimal power transfer without external tuning or calibration |
| Ultra-low profile | 0.65 mm height after reflow - compatible with space-constrained IoT modules and wearables |
Applications
| Wireless Sensor Node | Smart Utility Meter |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting at 434 MHz in building automation. IC Role / Device Role / Timing Role: Balun interface between SPIRIT1 transceiver and PCB trace antenna, providing matched 50 Ω interface and harmonic suppression. Use Value: Enables >10-year battery life by eliminating external matching network losses and reducing BOM count by 4 components. | Use Scenario: AMR (Automatic Meter Reading) endpoint communicating over 434 MHz ISM band in residential gas/water meters. IC Role / Device Role / Timing Role: Integrated TX filter and RX balun ensures ETSI-compliant emissions and robust reception in electrically noisy utility environments. Use Value: Passes conducted emission tests at 868 MHz harmonics without added ferrites or shielding, cutting certification cost and time. |
| Industrial Remote Control | Asset Tracking Beacon |
Use Scenario: Handheld remote for HVAC or lighting control using OOK modulation at 434 MHz. IC Role / Device Role / Timing Role: Provides amplitude- and phase-balanced differential drive to SPIRIT1's RF ports, preserving modulation fidelity. Use Value: Achieves >100 m range at 10 dBm output with <1% BER due to <1 dB amplitude imbalance. | Use Scenario: Compact BLE+sub-GHz dual-mode beacon tracking logistics pallets indoors. IC Role / Device Role / Timing Role: Enables shared antenna architecture via SPIRIT1's RX/TX switching, with integrated harmonic rejection preventing self-interference. Use Value: Reduces antenna switch complexity and supports simultaneous multi-protocol coexistence in dense RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar balun-filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDK HHM2712A1 | 433 MHz center, −2.8 dB insertion loss, no integrated harmonic filter | Requires external 2nd-harmonic trap; larger 1.6 × 2.0 mm footprint | Select when external filtering is already present and lower insertion loss is prioritized over integration |
| Qorvo QPQ1298 | 434 MHz, −3.5 dB insertion loss, includes 2nd/3rd harmonic suppression, 1.2 × 1.6 mm | Higher insertion loss but broader harmonic coverage; not SPIRIT1-conjugate matched | Select for multi-transceiver platforms where universal 434 MHz balun is preferred over SPIRIT1-specific optimization |
Compared with HHM2712A1 and QPQ1298, BALF-SPI-02D3 uniquely combines SPIRIT1-specific conjugate matching, integrated 2nd-harmonic filtering, and smallest footprint-making it optimal for cost- and size-sensitive ST-based designs where full RF chain integration is required.
Availability
BALF-SPI-02D3 is available at Aetrix Electronics and suitable for wireless sensor nodes, smart utility meters, industrial remote controls, and asset tracking beacons requiring stable component supply and guaranteed long-term availability.
Supply support for BALF-SPI-02D3 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 power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.
BALF-SPI-02D3 belongs to ST's RF front-end portfolio, engineered specifically to simplify and miniaturize sub-GHz wireless system design for ST's SPIRIT1 transceiver family.
FAQ
Is BALF-SPI-02D3 compatible with other transceivers besides SPIRIT1?
No. The BALF-SPI-02D3 is conjugate-matched to the SPIRIT1's specific differential output impedance and internal bias conditions. Its impedance transformation and harmonic filter response are optimized for that IC only; using it with other transceivers (e.g., CC1101 or SX1276) results in >6 dB return loss and degraded harmonic suppression.
What is the recommended PCB layout for optimal RF performance?
ST specifies strict layout rules: copper pads must be 220 µm diameter, solder mask opening 320 µm, and ground clearance under the die must be 130 µm for RX and 100 µm for TX/ANT. A 4-layer stack-up with dedicated RF ground plane beneath the balun is mandatory to achieve specified −44 dB harmonic attenuation and <1° phase imbalance.
Does BALF-SPI-02D3 require external DC blocking capacitors?
No. The device is fully AC-coupled internally; all ports (RFIN, RFP, RFN, ANT) are DC-isolated. No external DC blocking capacitors are needed-this is confirmed in Figure 2 (application schematic) and Table 4 RF performance test conditions, which specify measurements with no external series capacitors.
Can BALF-SPI-02D3 be used in 868 MHz systems?
No. Its balun transformation ratio and harmonic filter cutoff are fixed for 434 MHz operation. At 868 MHz, S21 drops to −8.7 dB and S11 degrades to −6.2 dB, failing both impedance match and regulatory harmonic limits. ST does not characterize or guarantee performance outside the 424–444 MHz band.
BALF-SPI-02D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-WFBGA, FCBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Frequency Range:
- 434MHz
- Impedance - Unbalanced/Balanced:
- 50 / -Ohm
- Phase Difference:
- 10°
- Insertion Loss (Max):
- 2.3dB
- Return Loss (Min):
- 15dB
- Mounting Type:
- Surface Mount
BALF-SPI-02D3 FAQ
1.How can I place an order for BALF-SPI-02D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BALF-SPI-02D3 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 BALF-SPI-02D3 reliable?
The price and inventory of BALF-SPI-02D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BALF-SPI-02D3 is usually 5 days.
3.What payment methods are accepted for BALF-SPI-02D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BALF-SPI-02D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BALF-SPI-02D3?
BALF-SPI-02D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BALF-SPI-02D3 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 BALF-SPI-02D3?
For technical support, including BALF-SPI-02D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BALF-SPI-02D3 requirements.
6.How does Aetrix verify that BALF-SPI-02D3 is sourced from the original manufacturer or authorized distributors?
All BALF-SPI-02D3 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 BALF-SPI-02D3 meets industry standards.
7.What is the process for return or replacement of BALF-SPI-02D3?
All BALF-SPI-02D3 units undergo pre-shipment inspection (PSI). If there is an issue with BALF-SPI-02D3, 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 BALF-SPI-02D3 part is unused and in its original packaging.
Return procedure for BALF-SPI-02D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BALF-SPI-02D3 Tags
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2450BL15B0100001E
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1720BL15B0050001E
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0900PC15A0036001E
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0868BM15C0001001E
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0915BM15A0001001E
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