STMicroelectronics STPTIC-68F1M6

Overview

STPTIC-68F1M6 from STMicroelectronics is a Parascan™ tunable integrated capacitor using barium strontium titanate (BST) dielectric, designed as a voltage-controlled shunt/series RF tuning element in antenna matching networks. It delivers 6.8 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 LTE/WCDMA front-end modules.

For engineers reviewing the STPTIC-68F1M6 datasheet, STPTIC-68F1M6 pinout, STPTIC-68F1M6 application, or STPTIC-68F1M6 equivalent, key selection criteria include its DC-blocked bias architecture, µQFN-6L package footprint, 2–20 V analog control voltage range, leakage current ≤100 nA at 20 V, and transition time of 100–135 µs between C_min and C_max.

Technical Context

The STPTIC-68F1M6 implements a monolithic BST-based varactor structure with DC-isolated bias path, enabling high-linearity RF tuning without RF signal contamination on the control line. Its shunt/series configuration supports both series-resonant and parallel-resonant matching topologies in multi-band antenna systems.

It operates under 2–20 V analog bias, delivering 6.12–7.48 pF capacitance range (±10% tolerance), third-order intercept point (IP3) of 60–70 dBm depending on bias, and harmonic suppression of –45 dBm (H3) and –65 dBm (H2) at 34 dBm input power.

Key Specifications

Pinout & Package

STPTIC-68F1M6 is housed in a lead-free, ECOPACK®2-compliant µQFN-6L plastic molded package measuring 1.2 × 1.6 × 0.9 mm, with wettable flank leads for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AVX F0603A680JVTR and Qorvo QM33110, STPTIC-68F1M6 uniquely balances high Q, fast tuning speed, and standardized µQFN manufacturability-making it optimal for volume production of adaptive antenna systems requiring field-deployable calibration.

Availability

STPTIC-68F1M6 is available at Aetrix Electronics and suitable for LTE antenna matching networks, open-loop RF filters, GSM/WCDMA diversity tuning, and 5G sub-3 GHz beamforming applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for STPTIC-68F1M6 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, specializing in automotive, industrial, power, and RF solutions with vertical manufacturing and broad IP portfolio.

The STPTIC series belongs to ST's RF Tunable Passive Devices product line, engineered specifically for adaptive antenna impedance matching in mobile terminals-addressing radiated performance degradation caused by mechanical enclosure effects and user interaction.

FAQ

What is the maximum allowable DC bias voltage for reliable operation?

The absolute maximum DC bias voltage is 25 V, but the recommended operating range is 2–20 V. Operating above 20 V risks accelerated dielectric aging and reduced long-term capacitance stability, especially under thermal stress. The 20 V upper limit ensures ≥1000-hour reliability at +85 °C ambient while maintaining specified tuning linearity and leakage current.

Can STPTIC-68F1M6 be used in series or shunt configuration?

Yes-STPTIC-68F1M6 supports both configurations. In shunt mode, RF1 and RF2 terminals connect across antenna feed and ground; in series mode, one RF pair connects inline with the feed path while the other remains unused or grounded. The datasheet confirms validated performance in both topologies under 50 Ω test conditions, with identical IP3 and Q metrics.

Is external DC blocking required on the bias line?

No-STPTIC-68F1M6 integrates internal DC blocking between the A1 bias pin and RF ports. This eliminates the need for external series capacitors or ferrite beads on the control line, simplifying layout and preventing RF leakage into bias circuitry. The internal blocking maintains >30 dB isolation up to 3 GHz per characterization data in Table 4.

How does temperature affect capacitance tuning accuracy?

Capacitance drift over –30 °C to +85 °C is ±5% of nominal value at fixed bias, verified per Table 4 test conditions. The BST material exhibits predictable, monotonic C-V shift with temperature, allowing factory calibration offsets to maintain <±0.3 pF error across operating range. No active temperature compensation is required in typical handset implementations.