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STMicroelectronics LNBTVS4-221S
- Part No.:
- LNBTVS4-221S
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
LNBTVS4-221S.pdf
- Description:
- TVS DIODE 20VWM 32VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,396
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Product details
Overview
LNBTVS4-221S 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 334 A peak pulse current (8/20 µs), 23.1–24.2 V breakdown voltage, 60 V clamping voltage at 334 A, 0.2 µA leakage at 25 °C, and operates up to 150 °C junction temperature in SMC (DO-214AB) package.
For engineers reviewing the LNBTVS4-221S datasheet, LNBTVS4-221S pinout, LNBTVS4-221S application, or LNBTVS4-221S equivalent, this device is selected specifically for IEC 61000-4-5-compliant surge protection on 12 V LNBH supply lines in satellite receiver front-ends where low capacitance, high clamping efficiency, and thermal stability at 85 °C ambient are critical.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low clamping factor across temperature. Its unidirectional configuration enables integration with LNBH23/LNBH24/LNBH25/LNBH26 ICs without reverse-bias interference on DC supply paths.
The device meets IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact), IEC 61000-4-5 (4 kV, 12 Ω source), and MIL-STD-883G Class 3B HBM (25 kV), while maintaining compliance at Tj = 85 °C using standard IPC 7531 footprints - enabling drop-in replacement in existing LNB protection layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Current (8/20 µs) | 334 A - withstands 4 kV surges per IEC 61000-4-5 with 12 Ω source impedance |
| Breakdown Voltage (VBR) | 23.1–24.2 V @ 1 mA - ensures reliable triggering above LNBH23/24 regulated 12–18 V output |
| Clamping Voltage (VCL) | 60 V @ 334 A - limits transient overvoltage to safe level for downstream LNBH IC inputs |
| Leakage Current | 0.2 µA @ 22 V - negligible loading on LNBH quiescent current budget |
| Junction Temperature Range | −55 to +150 °C - supports operation in sealed satellite receiver enclosures with no active cooling |
| Package | SMC (DO-214AB) - JEDEC-registered footprint compatible with IPC 7531, 0.245 g mass, UL 94 V0 resin |
Pinout & Package
SMC package (JEDEC DO-214AB) with cathode-indicating band; two-terminal unidirectional configuration optimized for series placement on LNBH supply rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC input connection to LNBH regulator output | Connected directly to VOUT of LNBH23/LNBH24/LNBH25/LNBH26 ICs; carries full operating current |
| Cathode | DC return path to ground via series inductor | Connected through ≥13 nH inductor to P-GND; blocks RF signal path while passing surge energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping factor (VCL/VBR ≈ 2.5) | Enables tighter overvoltage margin control vs. LNBH IC absolute maximum ratings (typically 65 V) |
| High surge capability at elevated temperature | Maintains IEC 61000-4-5 compliance at Tj = 85 °C - eliminates derating in thermally constrained set-top box designs |
| Low forward voltage (1.2 V @ 3 A) | Minimizes DC voltage drop during normal operation; avoids affecting LNB bias regulation accuracy |
| Low intrinsic capacitance (5.5 pF) | Reduces RF attenuation in IF path when used with ≥13 nH series inductor per Figure 9 |
Applications
| Satellite LNB Power Protection | LNBH23/LNBH24-Based Receivers |
|---|---|
Use Scenario: Protecting 12 V DC supply line feeding LNBH23/LNBH24 ICs in digital satellite receivers against antenna-coupled lightning surges. IC Role / Device Role: Unidirectional TVS placed between LNBH output and series inductor, shunting surge energy to ground. Use Value: Prevents catastrophic failure of LNBH ICs under 4 kV IEC 61000-4-5 surges while preserving 22 kHz DiSEqC signaling integrity. |
Use Scenario: Integration into reference designs for ST's LNBH23L and LNBH24L dual-output LNB regulators. IC Role / Device Role: Primary surge clamp on VUP rail, coordinated with external 13 nH inductor to isolate RF path. Use Value: Enables single-component compliance with IEC 61000-4-5 without redesigning PCB layout or adding filtering components. |
| LNBH25/LNBH26 High-Voltage Systems | Multi-Switch DiSEqC Front-Ends |
Use Scenario: Surge protection for LNBH25/LNBH26-based systems delivering up to 21 V to wideband LNBs. IC Role / Device Role: Standoff voltage (23.1 V min) ensures stable clamping above LNBH25's extended output range. Use Value: Eliminates need for higher-VBR alternatives while retaining compatibility with legacy SMC footprints. |
Use Scenario: Protection of multi-switch DiSEqC controllers handling simultaneous 13/18 V switching and 22 kHz tone injection. IC Role / Device Role: Fast-response TVS on common supply rail shared by multiple LNBH outputs and tone generators. Use Value: Prevents latch-up or gate oxide damage in DiSEqC logic during antenna-port transients. |
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 VBR (26.7–29.5 V), lower IPP (100 A @ 8/20 µs), SMB package | Not rated for 4 kV IEC 61000-4-5 at 85 °C; requires larger footprint derating | Select only if system ambient < 60 °C and surge level ≤ 2 kV; not suitable for LNBH23/24 direct replacement |
| SMCJ24A | Same SMC package, but VBR = 26.7–29.5 V, IPP = 123 A @ 8/20 µs, higher VCL (38.9 V) | Lacks specified 4 kV IEC 61000-4-5 compliance; clamping voltage exceeds LNBH23 absolute max rating | Use only in non-satellite applications requiring general-purpose 24 V rail protection; avoid in LNBH designs |
Compared with SMBJ24A and SMCJ24A, LNBTVS4-221S delivers verified 4 kV surge immunity at 85 °C ambient with precise 23.1–24.2 V triggering and 60 V clamping - making it the only option qualified for direct integration with ST's LNBH family without thermal or electrical compromise.
Availability
LNBTVS4-221S is available at Aetrix Electronics and suitable for satellite receiver manufacturing, LNBH regulator reference designs, and DiSEqC switch module production requiring stable component supply and full IEC 61000-4-5 compliance.
Supply support for LNBTVS4-221S 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
LNBTVS4-221S belongs to ST's Transil™ TVS diode product line, engineered specifically for low-noise block (LNB) protection in satellite reception systems - emphasizing low capacitance, high-temperature surge resilience, and seamless interoperability with ST's LNBH-series regulator ICs.
FAQ
What is the maximum surge current LNBTVS4-221S can handle without failure?
LNBTVS4-221S is rated for 334 A peak pulse current under the 8/20 µs waveform per IEC 61000-4-5. At this level, its clamping voltage remains at 60 V, and it maintains functionality after the event. Exceeding 334 A may cause permanent short-circuit failure, as stated in Table 2's absolute maximum ratings footnote.
Can LNBTVS4-221S be used without the series inductor shown in Figure 9?
No. Direct connection to the IF connector would introduce 5.5 pF capacitance that attenuates RF signals above 900 MHz. The ≥13 nH series inductor forms an LC trap that blocks high-frequency surges while remaining transparent at 22 kHz DiSEqC tone frequency - a mandatory design requirement confirmed in Application Information section 2.
How does LNBTVS4-221S differ from LNBTVS4-220S and LNBTVS4-222S?
LNBTVS4-221S has identical VBR (23.1–24.2 V) and IPP (334 A) as other LNBTVS4 variants, but differs in clamping voltage: 60 V (vs. 55 V for -220S and 30 V for -222S). This reflects tighter VCL binning for applications demanding precise overvoltage limiting at high surge currents.
Is LNBTVS4-221S RoHS-compliant and halogen-free?
Yes. Per Package Information section 3, LNBTVS4-221S uses RoHS-compliant packaging and ECOPACK®-qualified materials. Its epoxy resin meets UL 94 V0 flammability rating, and solderability complies with MIL-STD-750 Method 2026 - confirming full environmental compliance for modern satellite receiver manufacturing.
LNBTVS4-221S 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):
- 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
LNBTVS4-221S FAQ
1.How can I place an order for LNBTVS4-221S through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBTVS4-221S 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 LNBTVS4-221S reliable?
The price and inventory of LNBTVS4-221S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBTVS4-221S is usually 5 days.
3.What payment methods are accepted for LNBTVS4-221S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBTVS4-221S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBTVS4-221S?
LNBTVS4-221S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBTVS4-221S 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 LNBTVS4-221S?
For technical support, including LNBTVS4-221S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBTVS4-221S requirements.
6.How does Aetrix verify that LNBTVS4-221S is sourced from the original manufacturer or authorized distributors?
All LNBTVS4-221S 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 LNBTVS4-221S meets industry standards.
7.What is the process for return or replacement of LNBTVS4-221S?
All LNBTVS4-221S units undergo pre-shipment inspection (PSI). If there is an issue with LNBTVS4-221S, 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 LNBTVS4-221S part is unused and in its original packaging.
Return procedure for LNBTVS4-221S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LNBTVS4-221S 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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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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