My Inquiry
My Account
STMicroelectronics LNBTVS4-221
- Part No.:
- LNBTVS4-221
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
LNBTVS4-221.pdf
- Description:
- TVS DIODE 20VWM 32VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LNBTVS4-221 from STMicroelectronics is a unidirectional transient voltage suppressor diode designed for lightning and electrical overstress protection of LNB (low-noise block) power supplies in satellite set-top box systems. It delivers 4 kV surge immunity (8/20 µs), features a 22 V breakdown voltage, clamps at 60 V under 2000 A peak pulse current, and exhibits low forward voltage (1.2 V at 3 A), enabling robust overvoltage protection in DC bias rail applications.
For engineers reviewing the LNBTVS4-221 datasheet, LNBTVS4-221 pinout, LNBTVS4-221 application, or LNBTVS4-221 equivalent, key selection criteria include its 4 kV IEC 61000-4-5 compliance, DO-201 axial package compatibility, 22 V standoff rating, unidirectional polarity, and integration with ST's LNBP/LNBS series LNB regulators.
Technical Context
The LNBTVS4-221 operates as a clamping-type TVS diode in series with the LNB supply line, triggered by voltage transients exceeding its 22 V breakdown threshold. Its unidirectional architecture ensures conduction only during positive surges relative to cathode, preserving reverse-bias integrity of downstream regulators.
It achieves fast response (<1 ns) and low clamping factor (VCL/VBR ≈ 2.73) due to optimized silicon junction design, and sustains 5500 W peak pulse power (8/20 µs) without failure-critical for passing IEC/FCC lightning immunity tests in consumer satellite receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 22 V minimum at 1 mA - defines precise turn-on threshold for surge clamping |
| Clamping Voltage (VCL | 60 V at 2000 A (8/20 µs) - limits maximum stress on protected LNB regulator |
| Peak Pulse Power (PPP) | 5500 W - supports high-energy lightning transients per IEC 61000-4-5 |
| Standoff Voltage (VRM) | 32 V - ensures no conduction during normal 22–24 V LNB supply operation |
| Forward Voltage (VF) | 1.2 V at 3 A - minimizes insertion loss and self-heating in DC path |
| Junction-to-Lead Thermal Resistance | 20 °C/W (DO-201) - enables reliable power dissipation without heatsink |
Pinout & Package
Package: DO-201 axial leaded package (cathode indicated by band). Dimensions: ØD = 0.96–1.06 mm, length = 8.5–9.5 mm, body diameter = 4.8–5.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected LNB supply rail | Connected to upstream DC source (e.g., LNBP20 output); conducts surge current toward cathode |
| Cathode | Output side, tied to LNB regulator input | Banded end; referenced to system ground; provides low-impedance path to shunt surge energy |
Key Features
| Feature | Design Value |
|---|---|
| 4 kV Surge Rating (8/20 µs) | Validated per IEC 61000-4-5 with 12 Ω source impedance - meets global regulatory requirements for satellite receivers |
| Low Clamping Factor | VCL/VBR = 2.73 - reduces voltage overshoot margin needed in LNB regulator design |
| Unidirectional Operation | Enables placement directly in positive supply rail without reverse leakage concerns during normal operation |
| DO-201 Mechanical Compatibility | Supports automated axial insertion and wave soldering - aligns with legacy STB manufacturing processes |
Applications
| Satellite Set-Top Box LNB Supply Protection | Terrestrial Digital TV Tuner Module |
|---|---|
Use Scenario: Protects 22 V DC feed to LNB in outdoor satellite dish assemblies exposed to induced lightning surges. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between LNBP20 regulator output and coaxial cable feed. Use Value: Limits transient voltage to ≤60 V during 4 kV events, preventing latch-up or destruction of LNBP21/LNBS21 regulators. | Use Scenario: Shields tuner IC power input in DVB-T/T2 receiver modules mounted near rooftop antennas. IC Role / Device Role / Timing Role: Primary surge suppression device on 22 V bias rail feeding RF front-end amplifiers. Use Value: Maintains <1 µA leakage at 32 V standoff, avoiding quiescent current drift in sensitive analog tuner stages. |
| Multi-Switch LNB Distribution System | Professional Satellite IF Distribution Hub |
Use Scenario: Installed on each output port of DiSEqC-compatible multi-switch units powering multiple LNBs. IC Role / Device Role / Timing Role: Per-port transient guard ensuring fault isolation when one LNB experiences surge coupling. Use Value: Withstands repeated 2000 A pulses without degradation - critical for field-replaceable modular architectures. | Use Scenario: Integrated into rack-mounted IF distribution amplifiers handling multiple satellite bands (C/Ku-band). IC Role / Device Role / Timing Role: Frontline protection on 22 V/13 V dual-rail switching circuitry controlling LNB polarization. Use Value: 1.2 V forward drop minimizes voltage sag during high-current 22 kHz tone modulation bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LNBTVS4-221S | Same electrical specs, SMC surface-mount package instead of DO-201 | Requires reflow assembly; unsuitable for through-hole or manual repair | Select for high-volume SMT production where board space and automation efficiency are prioritized |
| LNBTVS4-220 | Identical package and construction, but 55 V clamping (vs. 60 V) at 1800 A | Lower clamping voltage suits tighter-margin LNB regulators with <55 V absolute max rating | Choose when protecting LNBP11x-series regulators with lower VIN(max) tolerance |
Compared with LNBTVS4-221S and LNBTVS4-220, the LNBTVS4-221 offers the highest clamping voltage (60 V) at the highest surge current (2000 A), making it optimal for ruggedized LNB designs requiring margin against worst-case 4 kV transients while maintaining compatibility with standard DO-201 mounting.
Availability
LNBTVS4-221 is available at Aetrix Electronics and suitable for satellite receiver manufacturing, terrestrial digital TV tuner production, and professional IF distribution equipment requiring stable component supply and long-term obsolescence management.
Supply support for LNBTVS4-221 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 microcontrollers, power ICs, sensors, and discrete components for industrial, automotive, and consumer markets.
The LNBTVSx-22xx series belongs to ST's dedicated protection portfolio for satellite signal chain infrastructure, engineered specifically to meet IEC/FCC surge immunity requirements in LNB power regulation circuits.
FAQ
What is the maximum continuous DC voltage the LNBTVS4-221 can withstand without clamping?
The LNBTVS4-221 has a maximum standoff voltage (VRM) of 32 V, meaning it remains non-conductive up to this DC level under normal operating conditions. At 32 V, leakage current is guaranteed ≤1 µA, ensuring minimal impact on LNB regulator bias stability and power efficiency.
Does the LNBTVS4-221 require a heatsink for 4 kV surge events?
No heatsink is required. The DO-201 package provides 20 °C/W junction-to-lead thermal resistance, and the 5500 W peak pulse power is dissipated in sub-millisecond duration. Thermal mass of axial leads and PCB copper pours suffices for single-event surge handling per IEC 61000-4-5 test profiles.
Can LNBTVS4-221 be used in bidirectional signal lines?
No. The LNBTVS4-221 is unidirectional and intended only for DC power rail protection. Its cathode-anode polarity must be oriented with cathode toward ground or regulated output. For bidirectional data or AC-coupled lines, ST's bidirectional TVS variants (e.g., SMF series) are required.
How does the 1.2 V forward voltage affect LNB system performance?
The 1.2 V forward voltage occurs only during forward conduction (e.g., during surge clamping or accidental reverse wiring). In normal operation, the device is reverse-biased and exhibits <1 µA leakage. Thus, VF does not impact steady-state LNB supply efficiency-it only defines conduction loss during transient events.
LNBTVS4-221 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- LNBTVS
- Packaging:
- Cut Tape (CT)
- 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):
- 331A (8/20µs)
- Power - Peak Pulse:
- 2000W (2kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
LNBTVS4-221 FAQ
1.How can I place an order for LNBTVS4-221 through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBTVS4-221 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 LNBTVS4-221 reliable?
The price and inventory of LNBTVS4-221 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBTVS4-221 is usually 5 days.
3.What payment methods are accepted for LNBTVS4-221?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBTVS4-221 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBTVS4-221?
LNBTVS4-221 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBTVS4-221 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 LNBTVS4-221?
For technical support, including LNBTVS4-221 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBTVS4-221 requirements.
6.How does Aetrix verify that LNBTVS4-221 is sourced from the original manufacturer or authorized distributors?
All LNBTVS4-221 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 LNBTVS4-221 meets industry standards.
7.What is the process for return or replacement of LNBTVS4-221?
All LNBTVS4-221 units undergo pre-shipment inspection (PSI). If there is an issue with LNBTVS4-221, 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 LNBTVS4-221 part is unused and in its original packaging.
Return procedure for LNBTVS4-221:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LNBTVS4-221 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
