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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

STMicroelectronics LNBTVS6-221S

Name: LNBTVS6-221S
Brand: STMicroelectronics
SKU: LNBTVS6-221S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LNBTVS6-221S

Manufacturer:: STMicroelectronics

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: LNBTVS6-221S.pdf

Description:: TVS DIODE 20VWM 32VC SMC

Quantity:: RFQ Add To RFQ list

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Inventory:8,810

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Product details

Overview

LNBTVS6-221S 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 power regulators. It delivers 500 A peak pulse current (8/20 µs), 33.2 V clamping voltage at 500 A, 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 LNBTVS6-221S datasheet, LNBTVS6-221S pinout, LNBTVS6-221S application, or LNBTVS6-221S equivalent, key selection criteria include IEC 61000-4-5 compliance at 500 A, low clamping factor (V_CL/V_BR ≈ 1.37), unidirectional low forward voltage (1.2 V @ 3 A), and compatibility with LNBH23/LNBH25 control ICs in satellite receiver front-end protection circuits.

Technical Context

This TVS diode uses planar junction technology to achieve stable clamping performance across the full consumer temperature range (−55 °C to +85 °C ambient) while maintaining IEC 61000-4-5 compliance even at T_j = 85 °C. Its unidirectional configuration enables integration into DC-biased LNB supply lines without reverse conduction path concerns.

The device is optimized for placement between the LNBH output and antenna cable interface, requiring series inductance (>13 nH) to isolate its intrinsic capacitance from RF IF paths. It supports DiSEqC 22 kHz envelope signaling and withstands 25 kV HBM ESD per MIL-STD-883G method 3015-7 Class 3B.

Key Specifications

Parameter	Value and Actual Design Meaning
Peak Pulse Current (8/20 µs)	500 A - sustains IEC 61000-4-5 surge testing at 6 kV with 12 Ω source impedance
Clamping Voltage @ 500 A	33.2 V - limits transient overvoltage to safe level for downstream LNBH25/LNBH26 regulators
Breakdown Voltage Range	23.1–24.2 V @ 1 mA - matches typical LNBH output regulation range (22 V nominal)
Leakage Current	0.2 µA @ 22 V, 25 °C - negligible standby power loss in always-on satellite receiver power rails
Forward Voltage	1.2 V @ 3 A - minimizes DC drop and thermal stress during normal LNBH load operation
Junction Temperature Max	+150 °C - enables reliable operation in enclosed set-top box enclosures with limited airflow
Package	SMC (DO-214AB) - JEDEC-registered footprint compatible with IPC 7531 standard PCB layout

Pinout & Package

SMC (JEDEC DO-214AB) surface-mount package with cathode-indicating band; two-terminal unidirectional configuration.

Pin/Terminal	Circuit Role	Design Meaning
Anode	DC input connection to LNBH regulator output	Accepts 12–18 V DC supply; must be routed through ≥13 nH series inductor before IF connector
Cathode	Ground reference / surge return path	Connected to system power ground (P-GND); provides low-impedance path for transient energy dissipation

Key Features

Feature	Design Value
Low clamping factor (V_CL/V_BR)	≈1.37 - ensures tighter voltage margin between breakdown and clamping, improving LNBH survival under fast transients
High surge capability at T_jmax	1250 W @ 10/1000 µs - maintains protection integrity during sustained surges in thermally stressed environments
UL 94 V0 flammability rating	Epoxy resin housing - meets fire-safety requirements for consumer electronics enclosures
Compatibility with LNBH ICs	Validated with LNBH23, LNBH24, LNBH25, LNBH26 - eliminates need for external biasing or level-shifting circuitry

Applications

Satellite Set-Top Box LNB Power Protection

Digital Satellite Receiver Front-End

Use Scenario: Protecting LNBH25-regulated 13/18 V supply line feeding coaxial cable to outdoor satellite dish LNB.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between LNBH25 output and series inductor; clamps lightning-induced common-mode surges on antenna cable.

Use Value: Enables 6 kV IEC 61000-4-5 compliance without derating at 85 °C ambient, preserving LNBH25 lifetime in hot-climate deployments.

Use Scenario: Surge protection in multi-LNB DiSEqC switching systems where multiple coaxial feeds share a single receiver.

IC Role / Device Role / Timing Role: Per-port TVS on each LNBH-controlled feed line; blocks differential-mode transients induced by relay switching and nearby lightning.

Use Value: Prevents false DiSEqC command corruption and LNB lock-up by limiting transient overshoot to <34 V during 500 A surges.

Integrated LNB Module Protection

Professional Satellite Signal Distribution

Use Scenario: Embedded protection in compact integrated LNB modules used in motorized dish systems with built-in 22 kHz tone generation.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on regulated DC rail powering internal LNB and tone oscillator circuitry.

Use Value: Maintains 22 kHz signal integrity by limiting clamping delay to <1 ns and avoiding RF attenuation via proper inductor isolation.

Use Scenario: Centralized protection in multiswitch-based distribution systems serving hotels or apartment complexes.

IC Role / Device Role / Timing Role: Input-stage TVS on each multiswitch LNB input port; handles repeated surges from long cable runs exposed to atmospheric discharge.

Use Value: Delivers 22.5 kW peak pulse power (8/20 µs) to absorb cumulative surge energy without degradation over 10+ years of service.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ24A	Lower IPP (400 A), higher V_CL (38.9 V), SMB package	Limited to 4 kV IEC 61000-4-5; unsuitable for 6 kV LNBH25 designs	Select only if system-level surge requirement is ≤4 kV and board space constrains SMC use.
SMCJ24A	Same SMC package, identical V_BR, but V_CL = 38.9 V @ 43.5 A (not 500 A)	Rated for 43.5 A (8/20 µs), not 500 A - fails under full LNBTVS6-level surge stress	Not a functional substitute; requires redesign of surge test compliance strategy.

Compared with SMAJ24A and SMCJ24A, LNBTVS6-221S uniquely combines 500 A surge handling, 33.2 V clamping, and LNBH-specific validation-enabling direct drop-in replacement in satellite receiver designs certified to IEC 61000-4-5 Level 3 (6 kV) without thermal or voltage margin compromise.

Availability

LNBTVS6-221S is available at Aetrix Electronics and suitable for satellite receiver manufacturing, LNB module assembly, and professional multiswitch production requiring stable component supply and long-term lifecycle support.

Supply support for LNBTVS6-221S 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 automotive ICs for industrial, consumer, and communications markets.

LNBTVS6-221S belongs to ST's Transil™ TVS diode product line, engineered specifically for high-reliability surge protection in satellite signal chain power rails-balancing low clamping, high surge robustness, and RF-transparent integration.

FAQ

What is the maximum continuous DC voltage this TVS can withstand without clamping?

The LNBTVS6-221S has a stand-off voltage (V_RM) of 22 V, meaning it remains non-conductive up to 22 V DC under normal operation. Its breakdown begins at 23.1 V (min), so it safely regulates LNBH25's 13/18 V outputs without leakage or conduction during steady-state conditions.

Can this device be used without the recommended series inductor?

No. The LNBTVS6-221S exhibits intrinsic capacitance that attenuates RF signals above 900 MHz. Without the ≥13 nH series inductor specified in ST's application schematics (Figures 6–9), IF signal integrity degrades, causing video pixelation or loss of DiSEqC communication in satellite receivers.

How does its 150 °C junction rating impact real-world reliability?

The +150 °C T_jmax allows sustained operation in sealed set-top boxes where internal temperatures reach 85–100 °C. Unlike lower-rated TVS diodes, LNBTVS6-221S maintains full 500 A surge capability at T_j = 85 °C per Figure 3, preventing thermal runaway during repeated lightning events.

Is this part RoHS-compliant and halogen-free?

Yes. LNBTVS6-221S is supplied in an ECOPACK®-compliant SMC package meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The epoxy molding compound is UL 94 V0 rated and complies with MIL-STD-750 solderability standards.

LNBTVS6-221S Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: DO-214AB, SMC

Series:: LNBTVS, TRANSIL™

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 20V

Voltage - Breakdown (Min):: 22V

Voltage - Clamping (Max) @ Ipp:: 32V

Current - Peak Pulse (10/1000µs):: 500A (8/20µs)

Power - Peak Pulse:: 22500W (22.5kW)

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMC

LNBTVS6-221S FAQ

1.How can I place an order for LNBTVS6-221S through Aetrix?

Please submit a Request for Quotation (RFQ) for LNBTVS6-221S 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 LNBTVS6-221S reliable?

The price and inventory of LNBTVS6-221S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBTVS6-221S is usually 5 days.

3.What payment methods are accepted for LNBTVS6-221S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBTVS6-221S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LNBTVS6-221S?

LNBTVS6-221S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LNBTVS6-221S 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 LNBTVS6-221S?

For technical support, including LNBTVS6-221S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBTVS6-221S requirements.

6.How does Aetrix verify that LNBTVS6-221S is sourced from the original manufacturer or authorized distributors?

All LNBTVS6-221S 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 LNBTVS6-221S meets industry standards.

7.What is the process for return or replacement of LNBTVS6-221S?

All LNBTVS6-221S units undergo pre-shipment inspection (PSI). If there is an issue with LNBTVS6-221S, 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 LNBTVS6-221S part is unused and in its original packaging.

Return procedure for LNBTVS6-221S:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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