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onsemi NTVB170NSC-L
- Part No.:
- NTVB170NSC-L
- Manufacturer:
- onsemi
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
NTVB170NSC-L.pdf
- Description:
- THYRISTOR 170V 100A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,339
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Product details
Overview
NTVB170NSC-L from onsemi is a bidirectional thyristor surge protector (TSPD) designed for overvoltage protection in telecom line interfaces. It features 170 V peak off-state voltage (VDRM), 220 V breakover voltage (V(BO)), 4.0 V on-state voltage (VT), 150 mA holding current (IH), and 800 A peak pulse surge current (IPPS7, 10×1000 µs). It is used in central office and customer premises equipment to meet GR-1089-CORE and ITU-T K.20/21 compliance.
For engineers reviewing the NTVB170NSC-L datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional crowbar action, SMB package compatibility, 170 V VDRM rating, low capacitance (39 pF), and compliance with telecom surge standards including TIA-968-A and IEC 61000-4-5.
Technical Context
The NTVB170NSC-L operates as a voltage-triggered crowbar device: it remains high-impedance below VDRM (170 V), switches to low-impedance conduction at V(BO) = 220 V (both polarities), and latches until current falls below IH = 150 mA. Its dv/dt rating of 5.0 kV/s ensures immunity to false triggering under fast transients.
Designed for telecom primary protection, it handles repetitive 10×1000 µs surges up to 50 A(pk) and non-repetitive pulses up to 500 A(pk) in configuration C per GR-1089-CORE. Thermal resistance is 90 °C/W (Junction-to-Ambient, FR4 PCB), supporting operation from −40 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 170 V - Maximum continuous off-state voltage both polarities; defines maximum operating line voltage before conduction. |
| V(BO) | 220 V - Breakover voltage threshold where device triggers into crowbar mode; ensures reliable clamping above normal line peaks. |
| VT | 4.0 V - On-state voltage at 1.0 A(pk); determines power dissipation during surge (P = VT × IPPS) and limits protected circuit voltage drop. |
| IH | 150 mA - Minimum current required to maintain conduction; ensures clean reset after surge subsides. |
| IPPS7 | 50 A(pk) - Non-repetitive surge current rating for 10×1000 µs waveform; defines maximum single-event energy handling capability. |
| Co | 39 pF - Typical capacitance at 1 MHz, 2 Vdc bias; enables minimal signal distortion in high-speed telecom lines (e.g., xDSL). |
| dv/dt | 5.0 kV/s - Critical rate of rise of off-state voltage; prevents spurious turn-on from fast transient noise. |
Pinout & Package
NTVB170NSC-L is housed in an SMB (DO-214AA, Case 403C) surface-mount package with two terminals: MT1 and MT2. The device is symmetrical and bidirectional; either terminal may serve as anode or cathode depending on polarity of applied surge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 | Main Terminal 1 | One of two identical, interchangeable main terminals; forms bidirectional conduction path with MT2 when triggered. |
| MT2 | Main Terminal 2 | Main terminal opposite MT1; completes crowbar path during overvoltage events in either polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar protection | Single-device replacement for back-to-back SCRs; eliminates layout complexity and component count in AC-coupled telecom lines. |
| Low 39 pF capacitance | Preserves signal integrity in broadband applications such as ADSL/VDSL up to 30 MHz without requiring impedance compensation. |
| 170 V VDRM rating | Supports 120 VAC and 48 VDC telecom systems with sufficient margin against line surges and ringing voltages. |
| Pb-free SMB package | DO-214AA footprint enables automated SMT assembly and thermal performance matching industry-standard TVS diodes. |
| GR-1089-CORE & ITU-T K.20/21 certified | Validated for use in central office and network interface units without additional system-level surge testing. |
Applications
| DSL Line Interface Protection | Central Office Subscriber Line Card |
|---|---|
|
Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Primary crowbar protector placed between line transformer and codec IC; clamps transients before they reach sensitive analog front-end. Use Value: 39 pF capacitance avoids signal attenuation or phase shift in 1–30 MHz DSL bands; 170 V VDRM accommodates 120 VAC ring signals plus safety margin. |
Use Scenario: Front-end surge protection on subscriber line cards in telephone exchange equipment compliant with GR-1089-CORE. IC Role / Device Role / Timing Role: First-stage protector in multi-tiered defense; diverts >500 A surges (2×10 µs) away from secondary protectors and line interface ICs. Use Value: Bidirectional symmetry eliminates need for dual devices; SMB footprint allows dense placement near RJ-11 connectors without compromising PCB space. |
| VoIP Gateway Analog FXS Port | ISDN BRI U-Interface Protection |
|
Use Scenario: Safeguarding analog telephony ports in enterprise VoIP gateways exposed to PSTN line surges and ESD events. IC Role / Device Role / Timing Role: Standalone overvoltage protector across tip/ring lines; latches during surge and resets automatically when loop current drops below 150 mA. Use Value: 4.0 V VT ensures low clamping voltage during conduction, limiting stress on downstream SLIC and isolation transformers. |
Use Scenario: Protecting ISDN Basic Rate Interface (BRI) U-interface circuits from induced surges on 2-wire, 140 kbit/s digital lines. IC Role / Device Role / Timing Role: Bidirectional crowbar placed before line driver/receiver ICs; responds within nanoseconds to 10×360 µs surges per ITU-T K.21. Use Value: 220 V V(BO) provides precise trigger margin above 150 V DC line voltage while avoiding nuisance tripping from normal transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thyristor surge protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NTVB170SC-L | Same VDRM (170 V) and V(BO) (265 V), but higher breakover voltage; 39 pF capacitance identical. | Higher V(BO) delays triggering-better for systems with high ringing voltage but less responsive to fast transients. | Select NTVB170SC-L only if design requires higher trip threshold to avoid false triggering on benign line events. |
| NTVB220NSC-L | Higher VDRM (220 V) and V(BO) (300 V); same IH (150 mA), VT (4.0 V), and Co (33 pF). | Suitable for 240 VAC systems or hybrid AC/DC telecom infrastructure; not recommended for standard 120 VAC or 48 VDC lines due to elevated trip point. | Choose NTVB220NSC-L only when protecting higher-voltage interfaces where 170 V VDRM is insufficient. |
Compared with NTVB170SC-L and NTVB220NSC-L, the NTVB170NSC-L offers optimal balance of 170 V system compatibility, 220 V precise triggering, and 39 pF signal transparency-making it the preferred choice for standard telecom line cards and DSL/VoIP analog ports.
Availability
NTVB170NSC-L is available at Aetrix Electronics and suitable for DSL line interface protection, central office subscriber line cards, VoIP gateway FXS ports, and ISDN BRI U-interface protection requiring stable component supply and long-term lifecycle support.
Supply support for NTVB170NSC-L 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and communications markets.
The NTVB Series is part of onsemi's dedicated telecom protection portfolio, engineered specifically for GR-1089-CORE and ITU-T K.20/21 compliance in central office, access network, and customer premises equipment.
FAQ
What is the primary function of the NTVB170NSC-L in a telecom circuit?
The NTVB170NSC-L functions as a bidirectional thyristor surge protector (TSPD) that acts as a crowbar device-remaining non-conductive below 170 V (VDRM), triggering at 220 V (V(BO)) in either polarity, and diverting surge current away from sensitive components. Its role in telecom circuits is to provide primary overvoltage protection for DSL, VoIP, and ISDN line interfaces while maintaining low capacitance and fast response.
Does the NTVB170NSC-L require external triggering or control circuitry?
No, the NTVB170NSC-L is a passive, voltage-triggered device with no gate or control input. It relies solely on intrinsic thyristor characteristics: it switches to low-impedance conduction when voltage across MT1–MT2 exceeds V(BO) = 220 V in either direction, and remains latched until current falls below IH = 150 mA. No external bias, timing, or drive circuitry is needed for operation.
How does the 39 pF capacitance of the NTVB170NSC-L affect high-speed data lines like VDSL?
The 39 pF typical capacitance of the NTVB170NSC-L is measured at 1 MHz with 2 Vdc bias and is low enough to avoid significant insertion loss or group delay in VDSL2 (up to 30 MHz). In practice, this value preserves signal integrity across tip/ring pairs without requiring equalization or impedance tuning-enabling direct integration into ADSL/VDSL line card designs without performance penalty.
Can the NTVB170NSC-L be used in DC-powered telecom equipment such as 48 VDC POTS line cards?
Yes, the NTVB170NSC-L is rated for 170 V peak off-state voltage (VDRM) and operates bidirectionally, making it suitable for 48 VDC systems with substantial transient headroom. Its 220 V breakover voltage ensures robust immunity to common-mode surges while remaining well below destructive levels, and its −40 °C to +150 °C operating range supports industrial-grade DC-powered line cards.
What is the significance of the "-L" suffix in NTVB170NSC-L?
The "-L" suffix in NTVB170NSC-L denotes a lead-free (Pb-free) version compliant with RoHS Directive 2011/65/EU. This marking confirms that the device uses environmentally compliant materials in its SMB (DO-214AA) package and meets onsemi's Pb-free soldering and mounting specifications-including compatible reflow profiles and halogen-free molding compound.
NTVB170NSC-L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Breakover:
- 220V
- Voltage - Off State:
- 170V
- Voltage - On State:
- 4 V
- Current - Peak Pulse (8/20µs):
- -
- Current - Peak Pulse (10/1000µs):
- 100 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 1
- Capacitance:
- 99pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
NTVB170NSC-L FAQ
1.How can I place an order for NTVB170NSC-L through Aetrix?
Please submit a Request for Quotation (RFQ) for NTVB170NSC-L 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 NTVB170NSC-L reliable?
The price and inventory of NTVB170NSC-L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NTVB170NSC-L is usually 5 days.
3.What payment methods are accepted for NTVB170NSC-L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NTVB170NSC-L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NTVB170NSC-L?
NTVB170NSC-L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NTVB170NSC-L 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 NTVB170NSC-L?
For technical support, including NTVB170NSC-L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NTVB170NSC-L requirements.
6.How does Aetrix verify that NTVB170NSC-L is sourced from the original manufacturer or authorized distributors?
All NTVB170NSC-L 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 NTVB170NSC-L meets industry standards.
7.What is the process for return or replacement of NTVB170NSC-L?
All NTVB170NSC-L units undergo pre-shipment inspection (PSI). If there is an issue with NTVB170NSC-L, 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 NTVB170NSC-L part is unused and in its original packaging.
Return procedure for NTVB170NSC-L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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