STMicroelectronics LNBTVS6-220S

Overview

LNBTVS6-220S from STMicroelectronics is a unidirectional transient voltage suppressor (TVS) diode designed for lightning and electrical overstress protection of LNBH-series satellite low-noise block downconverter supply ICs. It delivers 500 A peak pulse current (8/20 µs), clamps at ≤33.2 V under 500 A surge, features 23.1–24.2 V breakdown voltage, 0.2 µA leakage at 25 °C, and operates up to 150 °C junction temperature in SMC (DO-214AB) package.

For engineers reviewing the LNBTVS6-220S datasheet, LNBTVS6-220S pinout, LNBTVS6-220S application, or LNBTVS6-220S equivalent, key selection criteria include IEC 61000-4-5 compliance at 500 A, low clamping factor relative to V_BR, unidirectional low-V_F (1.2 V @ 3 A), compatibility with LNBH23/LNBH25 control ICs, and mandatory series inductance (>13 nH) for RF-transparent IF line integration.

Technical Context

This TVS diode employs planar junction technology in a JEDEC DO-214AB (SMC) package to achieve high surge robustness while maintaining low parasitic capacitance. Its unidirectional configuration ensures forward conduction only during overvoltage events on the cathode-biased LNB supply rail, with clamping initiated at 23.1 V and stabilized below 33.2 V at full 500 A stress.

Thermal design is enabled by R_th(j-l) = 15 °C/W (junction-to-leads), supporting sustained operation at T_j = 150 °C and retaining IEC 61000-4-5 compliance even at T_j = 85 °C using standard IPC 7531 footprints. The device integrates UL 94 V0 flammability-rated epoxy and meets MIL-STD-883G HBM Class 3B (25 kV).

Key Specifications

Pinout & Package

Package: SMC (JEDEC DO-214AB), molded plastic case with solderable leads per MIL-STD-750 Method 2026; polarity indicated by cathode band.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ24A and SMCJ22A, LNBTVS6-220S uniquely combines 500 A surge capability, validated 85 °C IEC 61000-4-5 compliance, and LNBH IC co-design-making it irreplaceable for satellite receiver front-end protection where RF transparency and thermal reliability are non-negotiable.

Availability

LNBTVS6-220S is available at Aetrix Electronics and suitable for satellite receiver manufacturing, LNB power module assembly, and professional broadcast distribution equipment requiring stable component supply and guaranteed long-term availability.

Supply support for LNBTVS6-220S 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

LNBTVS6-220S belongs to ST's Transil™ TVS diode family, engineered specifically for low-noise block downconverter protection in satellite reception systems-prioritizing RF signal integrity, thermal resilience, and stringent IEC surge compliance.

FAQ

What is the correct PCB layout practice for LNBTVS6-220S in IF signal paths?

Place LNBTVS6-220S anode directly at the LNBH IC's V_UP output pin and route its cathode through a dedicated >13 nH surface-mount inductor before connecting to the IF connector. Keep the inductor's ground return path short and direct to minimize loop inductance. Avoid routing high-frequency IF traces near the TVS body to prevent capacitive coupling that could degrade 950–2150 MHz signal fidelity.

Does LNBTVS6-220S require derating at elevated ambient temperatures?

Yes-its 500 A peak pulse current rating applies at T_j = 25 °C. At T_j = 85 °C, the device remains fully compliant with IEC 61000-4-5, but actual surge capability reduces to approximately 375 A. Thermal design must ensure junction temperature stays ≤150 °C under worst-case power dissipation, using the published R_th(j-l) = 15 °C/W value and verified board copper area.

Can LNBTVS6-220S be used without a series inductor on the IF line?

No-direct connection to the IF connector is prohibited. LNBTVS6-220S has inherent junction capacitance (~3.5 nF) that would severely attenuate 950–2150 MHz satellite signals. The mandatory >13 nH series inductor creates a high-impedance barrier above 900 MHz while remaining transparent at 22 kHz DiSEqC control frequency, preserving both RF passband and digital command integrity.

How does LNBTVS6-220S differ from generic SMC-packaged TVS diodes like SMAJ24A?

LNBTVS6-220S is characterized and qualified specifically for LNBH regulator protection: it guarantees IEC 61000-4-5 compliance at T_j = 85 °C with standard footprints, features optimized clamping ratio (V_CL/V_BR ≈ 1.37), and undergoes screening for low leakage (0.2 µA) critical to LNB bias stability. Generic TVS diodes lack this application-specific validation and thermal derating data.