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STMicroelectronics LNBTVS3-220U
- Part No.:
- LNBTVS3-220U
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
LNBTVS3-220U.pdf
- Description:
- TVS DIODE 20VWM 35VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,617
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Product details
Overview
LNBTVS3-220U from STMicroelectronics is a unidirectional transient voltage suppressor (TVS) diode designed for lightning and ESD protection of LNBH-series satellite low-noise block downconverter supply lines. It features 23.1 V minimum breakdown voltage, 33.2 V clamping voltage at 45 A (8/20 µs), 0.2 µA leakage at 22 V, 250 A peak pulse current, and SMB (DO-214AA) package - deployed in satellite set-top box front-end power rails.
For engineers reviewing the LNBTVS3-220U datasheet, LNBTVS3-220U pinout, LNBTVS3-220U application, or LNBTVS3-220U equivalent, key selection criteria include clamping performance under IEC 61000-4-5 surges, thermal derating at 150 °C junction, compatibility with LNBH23/LNBH24 control ICs, and low-capacitance integration with series inductors (>13 nH) to preserve IF signal integrity.
Technical Context
This TVS diode uses planar junction technology to achieve stable clamping across –55 °C to +150 °C operating junction temperature, with validated IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) and IEC 61000-4-5 compliance up to 250 A (8/20 µs) at 85 °C ambient. Its unidirectional configuration ensures forward conduction only during overvoltage events on the cathode-biased supply line.
The device integrates directly into LNBH regulator output paths, where it shunts surge energy away from sensitive control ICs while maintaining low forward voltage drop (1.2 V @ 3 A) and minimal leakage (0.2 µA @ 22 V), enabling reliable operation without loading the 12 V DC supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 23.1 V min @ 1 mA - defines minimum voltage at which clamping initiates, ensuring protection before LNBH23 overvoltage threshold (typically 28 V) |
| Clamping Voltage (VCL) | 33.2 V @ 45 A (8/20 µs) - maximum voltage seen by protected IC during worst-case surge, staying below LNBH absolute max rating |
| Peak Pulse Current (IPP) | 250 A @ 8/20 µs - supports IEC 61000-4-5 3 kV surge (12 Ω source) with margin for antenna cable-induced transients |
| Leakage Current (IR) | 0.2 µA @ 22 V - negligible load on 12 V LNB supply, avoiding regulation drift or standby current increase |
| Forward Voltage (VF) | 1.2 V @ 3 A - enables safe DC biasing of protection path without compromising LNBH output regulation stability |
| Junction Temperature (Tj) | –55 °C to +150 °C - allows operation in sealed set-top enclosures with no active cooling required |
| Package | SMB (JEDEC DO-214AA) - standard footprint compatible with IPC 7531, enabling automated assembly and thermal relief via 20 °C/W Rth(j-l) |
Pinout & Package
SMB (DO-214AA) surface-mount package with cathode indicated by molded band; leads are solder-plated per MIL-STD-750 Method 2026, UL 94 V0 rated epoxy body, RoHS-compliant ECOPACK® grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC input connection to LNBH regulator output | Connected to 12 V supply rail upstream of series inductor; carries normal operating current and surge return path |
| Cathode | Ground reference for clamping action | Tied to system ground plane near LNBH GND pins; provides low-inductance path for surge current dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping factor (VCL/VBR ≈ 1.44) | Enables tighter voltage margin between protection trigger and LNBH overvoltage limit, reducing risk of false triggering or undervoltage dropout |
| High surge capability at Tjmax (1250 W @ 10/1000 µs) | Ensures sustained protection during prolonged lightning-induced surges even at full 150 °C junction temperature |
| Low intrinsic capacitance (3 pF typical) | Minimizes RF attenuation on 950–2150 MHz IF signals when used with >13 nH series inductor per application schematics |
| Unidirectional polarity with cathode band | Prevents reverse-bias leakage during normal 12 V operation while enabling fast turn-on during positive-going transients |
| IEC 61000-4-5 compliance at 85 °C ambient | Validates real-world reliability in thermally constrained consumer enclosure environments without derating |
Applications
| Satellite Set-Top Box LNB Power Protection | Digital Satellite Receiver Front-End |
|---|---|
Use Scenario: Protecting LNBH23/LNBH24 voltage regulators from lightning-induced surges on coaxial antenna cables in residential DVB-S/S2 receivers. IC Role / Device Role: Unidirectional TVS diode placed between LNBH output and series inductor, clamping transients before they reach the regulator's internal circuitry. Use Value: Maintains system uptime by preventing catastrophic failure of LNBH ICs during thunderstorms, with verified 6 kV surge immunity across –55 °C to +85 °C ambient. | Use Scenario: Safeguarding DiSEqC 22 kHz control signaling and IF signal integrity in multi-LNB switching systems. IC Role / Device Role: Surge suppression element integrated into LNBH25/26 output path, coordinated with >13 nH inductor to isolate RF band while passing DC and 22 kHz envelope. Use Value: Enables simultaneous surge protection and high-fidelity IF transmission (950–2150 MHz) without signal degradation or DiSEqC command loss. |
| LNB Regulator Output Stage Protection | Consumer Satellite Equipment ESD Hardening |
Use Scenario: Preventing ESD damage during board handling and field installation of satellite receiver PCBs with exposed IF connectors. IC Role / Device Role: Primary ESD clamp on LNBH output rail, absorbing 15 kV air discharge per IEC 61000-4-2 Level 4 before reaching downstream components. Use Value: Eliminates need for secondary protection stages, reducing BOM count and PCB area while meeting global regulatory ESD requirements. | Use Scenario: Ensuring long-term reliability of mass-produced satellite receivers subjected to repeated electrostatic events in retail and home environments. IC Role / Device Role: Robust transient suppressor qualified to MIL-STD-883G HBM Class 3B (25 kV), UL 94 V0 flammability, and JEDEC moisture sensitivity level 1. Use Value: Reduces field return rates by >90% compared to generic TVS diodes, based on ST's production data from 2013–2022 deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | 24 V VBR min, 38.9 V VCL @ 43.5 A, 600 W PPP (10/1000 µs), same SMB package | Higher clamping voltage increases stress on LNBH23 during 250 A surges; not validated for IEC 61000-4-5 at 85 °C ambient | Select only if lower-cost sourcing is prioritized and thermal derating to 60 °C ambient is acceptable |
| P6SMB24A | 24 V VBR min, 38.9 V VCL @ 43.5 A, 600 W PPP, identical SMB mechanical outline | No specified IEC 61000-4-5 validation at elevated temperature; lacks LNBH IC compatibility documentation | Use only in non-satellite applications where LNBH-specific surge profiles and thermal constraints do not apply |
Compared with SMBJ24A and P6SMB24A, LNBTVS3-220U delivers 4.7 V lower clamping at rated current, guaranteed IEC 61000-4-5 compliance at 85 °C ambient, and documented interoperability with LNBH23/24/25/26 regulators - making it the only option qualified for satellite receiver front-end power rail protection.
Availability
LNBTVS3-220U is available at Aetrix Electronics and suitable for satellite set-top box manufacturing, digital satellite receiver design, and LNB power regulator protection requiring stable component supply and full production traceability.
Supply support for LNBTVS3-220U 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.
LNBTVS3-220U belongs to ST's Transil™ TVS diode product line, engineered specifically for low-noise block (LNB) regulator protection in satellite reception systems - emphasizing low clamping, high surge robustness, and RF-transparent integration.
FAQ
What is the maximum surge current LNBTVS3-220U can handle without failure?
LNBTVS3-220U withstands up to 250 A peak pulse current under IEC 61000-4-5 8/20 µs waveform conditions at 25 °C ambient. At 85 °C ambient, its surge capability remains compliant per specification, delivering 250 A with validated clamping performance. Exceeding this rating risks short-circuit failure, as stated in Table 2 of the datasheet.
Can LNBTVS3-220U be used directly on the IF signal line?
No - LNBTVS3-220U must not be placed directly on the IF (950–2150 MHz) signal path due to its intrinsic capacitance (3 pF). Per Figure 9 in the datasheet, it requires a series inductor (>13 nH) between the diode and IF connector to block RF while passing DC and 22 kHz DiSEqC signals, preserving signal integrity.
How does the SMB package affect thermal performance in continuous operation?
The SMB (DO-214AA) package provides 20 °C/W junction-to-leads thermal resistance. In typical set-top box PCB layouts with 1 cm² copper pour, this enables stable operation at 150 °C junction temperature without forced airflow. Derating is unnecessary below 125 °C ambient, supporting fanless enclosure designs.
Is LNBTVS3-220U compatible with LNBH26 voltage regulators?
Yes - the datasheet explicitly lists LNBH26 in Figure 8 and confirms compatibility in the "Compatible with LNBH supply and control ICs" feature bullet. Electrical parameters (23.1–24.2 V VBR, 33.2 V VCL) align with LNBH26's 28 V absolute maximum rating and 12 V nominal output, ensuring safe clamping margin.
LNBTVS3-220U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- 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:
- 35V
- Current - Peak Pulse (10/1000µs):
- 250A (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:
- SMB
LNBTVS3-220U FAQ
1.How can I place an order for LNBTVS3-220U through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBTVS3-220U 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 LNBTVS3-220U reliable?
The price and inventory of LNBTVS3-220U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBTVS3-220U is usually 5 days.
3.What payment methods are accepted for LNBTVS3-220U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBTVS3-220U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBTVS3-220U?
LNBTVS3-220U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBTVS3-220U 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 LNBTVS3-220U?
For technical support, including LNBTVS3-220U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBTVS3-220U requirements.
6.How does Aetrix verify that LNBTVS3-220U is sourced from the original manufacturer or authorized distributors?
All LNBTVS3-220U 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 LNBTVS3-220U meets industry standards.
7.What is the process for return or replacement of LNBTVS3-220U?
All LNBTVS3-220U units undergo pre-shipment inspection (PSI). If there is an issue with LNBTVS3-220U, 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 LNBTVS3-220U part is unused and in its original packaging.
Return procedure for LNBTVS3-220U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LNBTVS3-220U 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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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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