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STMicroelectronics LNBTVS4-222S
- Part No.:
- LNBTVS4-222S
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
LNBTVS4-222S.pdf
- Description:
- TVS DIODE 20VWM 30VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:791
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Product details
Overview
LNBTVS4-222S from STMicroelectronics is a unidirectional transient voltage suppressor (TVS) diode designed for lightning and ESD protection of LNBH-series satellite low-noise block downconverter power regulators. It features a 23.1 V minimum breakdown voltage, 90 V clamping voltage at 334 A (8/20 µs), 0.2 µA leakage at 25 °C, 1.2 V forward voltage at 3 A, and operates up to 150 °C junction temperature in SMC (DO-214AB) package.
For engineers reviewing the LNBTVS4-222S datasheet, LNBTVS4-222S pinout, LNBTVS4-222S application, or LNBTVS4-222S equivalent, key selection criteria include clamping performance under IEC 61000-4-5 surges, compatibility with LNBH23/LNBH25 control ICs, thermal derating at 85 °C, and series inductance integration for RF transparency in satellite IF paths.
Technical Context
The LNBTVS4-222S employs planar junction technology optimized for high-reliability satellite receiver front-ends. Its unidirectional architecture provides low forward voltage (1.2 V @ 3 A) while maintaining tight breakdown tolerance (23.1–24.2 V) and low clamping factor-critical for protecting sensitive LNBH regulator outputs without interfering with 22 kHz DiSEqC signaling.
It delivers 334 A peak pulse current (8/20 µs, 12 Ω source) and remains IEC 61000-4-5 compliant at 85 °C ambient using standard IPC 7531 footprints. Thermal resistance is 15 °C/W (junction-to-leads), enabling stable operation under sustained surge stress in compact SMC packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 23.1 V min @ 1 mA - ensures reliable triggering before LNBH23 output overvoltage damage threshold |
| Clamping Voltage (VCL) | 90 V @ 334 A (8/20 µs) - limits transient energy delivered to downstream LNBH regulator |
| Leakage Current (IR) | 0.2 µA @ 22 V - negligible DC loading on 12 V LNB supply rail |
| Forward Voltage (VF) | 1.2 V @ 3 A - minimizes conduction loss during DiSEqC 22 kHz envelope transmission |
| Junction Temperature (Tj) | −55 to +150 °C - supports full consumer operating range including hot-set-top-box enclosures |
| Package | SMC (JEDEC DO-214AB) - standardized footprint compatible with IPC 7531 layout guidelines |
| Surge Rating | 334 A (8/20 µs, 12 Ω) - meets IEC 61000-4-5 Level 4 for lightning-induced surges on antenna cables |
Pinout & Package
SMC (JEDEC DO-214AB) surface-mount package with cathode-indicating band; leads are solder-plated and compliant with MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of unidirectional TVS path | Connected to LNBH output rail (e.g., Vup or Vctrl) upstream of series inductor |
| Cathode | Clamping node / ground reference | Connected to system ground (P-GND/A-GND) via low-inductance path; band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping factor (VCL/VBR ≈ 3.9) | Enables robust protection margin below LNBH25 absolute maximum ratings (e.g., 100 V) |
| High surge capability at elevated Tj | Maintains 334 A rating at 85 °C ambient - eliminates derating in thermally constrained STB PCBs |
| Low forward voltage (1.2 V @ 3 A) | Preserves DiSEqC 22 kHz signal integrity without distorting TTL-level envelope modulation |
| UL 94 V0 flammability rating | Meets safety requirements for enclosed consumer electronics housing near power circuits |
| ECOPACK® RoHS-compliant packaging | Supports global environmental compliance without sacrificing thermal or surge performance |
Applications
| Satellite LNB Power Protection | DiSEqC-Controlled Antenna Switching |
|---|---|
Use Scenario: Protecting LNBH23/LNBH25 regulator outputs from lightning-induced surges on coaxial antenna cables in digital satellite receivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LNBH output and series inductor (>13 nH) to clamp transients while preserving 22 kHz DiSEqC signaling. Use Value: Prevents catastrophic failure of LNBH ICs during 4 kV IEC 61000-4-5 surges while maintaining <1.2 V forward drop for clean envelope transmission. | Use Scenario: Securing DiSEqC command lines in multi-LNB installations where voltage spikes occur during switching transitions. IC Role / Device Role / Timing Role: Transient suppression on Vctrl or EXTM pins handling 22 kHz-modulated TTL signals to LNBs. Use Value: Ensures reliable DiSEqC communication by limiting overshoot to <90 V without distorting rise/fall times critical for protocol timing. |
| LNBH Regulator Output Clamping | IF Path Surge Isolation |
Use Scenario: Direct clamping of LNBH26 Vup output rail in single-cable distribution systems exposed to atmospheric discharge. IC Role / Device Role / Timing Role: Primary overvoltage clamp positioned immediately after LNBH regulator output, before series inductor and RF choke. Use Value: Limits transient voltage to ≤90 V during 334 A surges, preventing gate oxide damage in integrated LNBH pass transistors. | Use Scenario: Surge isolation in hybrid LNB modules where IF output shares PCB space with unprotected control lines. IC Role / Device Role / Timing Role: Secondary protection element placed on IF connector ground return path to shunt common-mode surges. Use Value: Reduces RF interference coupling into IF stage by diverting >90% of 8/20 µs surge current away from sensitive RX/TX signal traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Higher clamping voltage (38.9 V @ 22.5 A), lower peak pulse current (22.5 A vs. 334 A), SMB package | Rated for general-purpose board-level ESD, not validated for LNBH-compatible surge profiles or 85 °C IEC 61000-4-5 compliance | Select only for non-satellite applications with lower surge severity and no DiSEqC timing constraints |
| SMCJ24A | Same SMC package, but 38.9 V clamping @ 100 A (8/20 µs); lacks LNB-specific thermal derating data at 85 °C | Designed for industrial power rails-not characterized for LNBH23/LNBH25 interface compatibility or RF-transparent inductor integration | Use only if LNBH-specific clamping margin and DiSEqC forward-voltage performance are not required |
Compared with SMBJ24A and SMCJ24A, LNBTVS4-222S offers 2.3× lower clamping voltage at rated surge current, guaranteed 85 °C IEC 61000-4-5 compliance, and DiSEqC-optimized forward characteristics-making it uniquely suited for satellite LNB regulator protection where timing fidelity and thermal stability are non-negotiable.
Availability
LNBTVS4-222S is available at Aetrix Electronics and suitable for satellite set-top box manufacturing, LNB module assembly, and DiSEqC-enabled antenna switch design requiring stable component supply and long-term obsolescence management.
Supply support for LNBTVS4-222S 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 analog, power, and automotive ICs with strong emphasis on industrial and consumer system solutions.
LNBTVS4-222S belongs to ST's Transil™ TVS diode family, engineered specifically for low-noise block (LNB) protection in satellite reception systems-balancing ultra-low clamping, RF-transparent integration, and thermal resilience in consumer-grade enclosures.
FAQ
What is the purpose of the series inductor used with LNBTVS4-222S?
The series inductor (>13 nH) isolates the TVS diode's intrinsic capacitance from the IF signal path. It presents high impedance above 900 MHz to prevent RF attenuation while remaining transparent at 22 kHz DiSEqC frequencies-ensuring both surge protection and uninterrupted satellite signal transmission.
Can LNBTVS4-222S be used without a series inductor on the IF line?
No. Direct connection to the IF connector would degrade RF signal integrity due to the diode's junction capacitance. The datasheet mandates series inductance to maintain RF transparency; omission risks insertion loss, group delay distortion, and degraded carrier-to-noise ratio in satellite demodulation.
How does LNBTVS4-222S maintain IEC 61000-4-5 compliance at 85 °C?
It achieves this through planar junction design and optimized thermal resistance (15 °C/W). Unlike generic TVS diodes, its surge rating is validated at 85 °C ambient using standard IPC 7531 footprints-ensuring 334 A (8/20 µs) clamping performance remains within specification without external heatsinking.
Is LNBTVS4-222S compatible with LNBH25 and LNBH26 regulators?
Yes. The device is explicitly characterized for use with LNBH23, LNBH24, LNBH25, and LNBH26 regulators per Figures 6–8 in the datasheet. Its 23.1 V breakdown and 90 V clamping align with the 100 V absolute maximum ratings of these ICs, and its 1.2 V forward drop preserves DiSEqC envelope fidelity.
LNBTVS4-222S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- LNBTVS, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22V
- Voltage - Clamping (Max) @ Ipp:
- 30V
- Current - Peak Pulse (10/1000µs):
- 334A (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
LNBTVS4-222S FAQ
1.How can I place an order for LNBTVS4-222S through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBTVS4-222S 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 LNBTVS4-222S reliable?
The price and inventory of LNBTVS4-222S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBTVS4-222S is usually 5 days.
3.What payment methods are accepted for LNBTVS4-222S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBTVS4-222S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBTVS4-222S?
LNBTVS4-222S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBTVS4-222S 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 LNBTVS4-222S?
For technical support, including LNBTVS4-222S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBTVS4-222S requirements.
6.How does Aetrix verify that LNBTVS4-222S is sourced from the original manufacturer or authorized distributors?
All LNBTVS4-222S 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 LNBTVS4-222S meets industry standards.
7.What is the process for return or replacement of LNBTVS4-222S?
All LNBTVS4-222S units undergo pre-shipment inspection (PSI). If there is an issue with LNBTVS4-222S, 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 LNBTVS4-222S part is unused and in its original packaging.
Return procedure for LNBTVS4-222S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LNBTVS4-222S Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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