STMicroelectronics STPTIC-33F1M6

Overview

STPTIC-33F1M6 from STMicroelectronics is a Parascan™ tunable integrated capacitor using barium strontium titanate (BST) dielectric, designed as a voltage-controlled RF matching element in antenna tuning networks. It delivers 3.3 pF nominal capacitance at 2 V bias, 3.5:1 tuning range (C_2V/C_20V), Q ≥ 65 at 900 MHz, +36 dBm peak RF power handling, and operates from DC to 3 GHz in cellular multi-band GSM/WCDMA/LTE handsets.

For engineers reviewing the STPTIC-33F1M6 datasheet, STPTIC-33F1M6 pinout, STPTIC-33F1M6 application, or STPTIC-33F1M6 equivalent, key selection criteria include analog bias control (2–20 V), µQFN-6L package compatibility with high-voltage driver ICs (e.g., STHVDAC series), leakage current ≤100 nA, and transition time ≤135 µs for open-loop antenna matching.

Technical Context

The STPTIC-33F1M6 implements a shunt/series-configurable BST-based varactor structure, where capacitance is tuned continuously via DC bias voltage without RF path interruption. Its parasitic-free flip-chip and µQFN variants maintain low insertion loss and high linearity across 700–3000 MHz bands.

It operates in open-loop adaptive RF systems requiring no feedback sensing-capacitance is set by external voltage source, enabling fast reconfiguration (<135 µs) for dynamic antenna impedance matching under varying grip/hand conditions in mobile phones.

Key Specifications

Pinout & Package

STPTIC-33F1M6 is supplied in µQFN-6L plastic molded package (1.2 × 1.6 × 0.9 mm), RoHS-compliant and ECOPACK®2 certified. The package features exposed thermal pad and solder mask-defined land pattern per Figure 3 of DocID023772 Rev 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar tunable capacitor applications.

Compared with AVX FMC1205330BFR and Qorvo QM33203, STPTIC-33F1M6 provides superior Q-factor and wider tuning range in a production-proven µQFN-6L package-critical for maintaining LTE throughput under marginal signal conditions and enabling single-component antenna calibration across all major cellular bands.

Availability

STPTIC-33F1M6 is available at Aetrix Electronics and suitable for cellular antenna matching, open-loop RF filter tuning, GSM/WCDMA diversity antenna compensation, and LTE MIMO calibration requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for STPTIC-33F1M6 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, designing and manufacturing microcontrollers, power management ICs, sensors, and RF components for automotive, industrial, and consumer markets.

The STPTIC series belongs to ST's RF Tunable Passive portfolio, engineered specifically to replace discrete varactor diodes and fixed capacitor banks in adaptive antenna systems-delivering higher reliability, tighter tolerance, and seamless integration with ST's STHVDAC high-voltage driver ICs.

FAQ

What is the recommended PCB layout for STPTIC-33F1M6 in µQFN-6L?

Use the land pattern in Figure 3 of DocID023772 Rev 4: 0.35 mm × 0.425 mm pads for RF1/RF2 terminals, 0.25 mm × 0.5 mm pad for DC BIAS (A1), and 0.3 mm × 0.3 mm NC pad (A2). Maintain 250 µm solder mask opening around each pad and connect the exposed thermal pad to a solid ground plane via ≥4 thermal vias (0.3 mm diameter, 0.8 mm pitch).

Can STPTIC-33F1M6 be used with 1.8 V logic-level control?

No-STPTIC-33F1M6 requires 2–20 V analog bias voltage for full 3.5:1 tuning range. A 1.8 V supply yields only partial capacitance variation (~1.5:1) and risks instability. Interface via ST's STHVDAC002 or STHVDAC003 high-voltage DACs, which accept 1.8 V SPI inputs and generate compliant 2–20 V outputs.

How does leakage current affect bias network design?

With ≤100 nA leakage at 20 V, the bias network can use high-value resistors (e.g., 1 MΩ) without significant voltage droop. However, for <10 µs settling time, pair the 1 MΩ resistor with a 100 pF local decoupling capacitor at the A1 pin to suppress RF coupling and ensure monotonic tuning response.

Is STPTIC-33F1M6 qualified for reflow per JEDEC J-STD-020D?

Yes-STPTIC-33F1M6 is rated MSL3 and qualified for standard lead-free reflow per Table 5 and Figure 13 in DocID023772 Rev 4: peak temperature 240–245 °C, time above 220 °C = 60–90 s, cooling gradient −2 to −3 °C/s. Avoid convection airflow >1 m/s during reflow to prevent µQFN lateral shift.