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onsemi NTVB170SA-L
- Part No.:
- NTVB170SA-L
- Manufacturer:
- onsemi
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
NTVB170SA-L.pdf
- Description:
- THYRISTOR 170V 50A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,552
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Product details
Overview
NTVB170SA-L from onsemi is a bidirectional thyristor surge protector (TSPD) designed for overvoltage clamping in telecom line interfaces. It features 170 V peak off-state voltage (VDRM), 240 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 protects central office and customer premises equipment per GR-1089-CORE and ITU-T K.20/21.
For engineers reviewing the NTVB170SA-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 TIA-968-A and IEC 61000-4-5 surge immunity standards.
Technical Context
The NTVB170SA-L operates as a voltage-triggered crowbar device: when transient voltage exceeds V(BO) = 240 V in either polarity, it latches into low-impedance conduction until current falls below IH = 150 mA. Its dv/dt rating of 5.0 kV/s ensures robust immunity to false triggering under fast-rising noise.
Designed for telecom primary protection, it supports dual-polarity surge suppression without external polarity management. Its 39 pF typical capacitance at 1 MHz minimizes signal distortion on voice/data lines, and its 90 °C/W junction-to-ambient thermal resistance enables reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 170 V - Maximum continuous reverse/forward blocking voltage before conduction begins |
| V(BO) | 240 V - Voltage threshold at which device triggers into crowbar mode in either polarity |
| VT | 4.0 V - On-state voltage drop at 1.0 A peak current, defining clamping headroom during surge |
| IH | 150 mA - Minimum current required to maintain conduction after triggering; determines reset behavior |
| IPPS7 | 50 A(pk) - Non-repetitive surge current capability for 10×1000 µs waveform per GR-1089-CORE |
| Co | 39 pF - Signal-line capacitance at 1 MHz/2 Vdc bias, critical for maintaining DSL/VoIP bandwidth integrity |
| TJ Range | −40 °C to +150 °C - Operating junction temperature range supporting industrial and outdoor telecom deployments |
Pinout & Package
NTVB170SA-L is housed in an SMB (DO-214AA) surface-mount package per JEDEC case 403C, with two terminals: MT1 and MT2. The device is symmetrical and bidirectional; neither terminal is designated anode or cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 | Main Terminal 1 | One of two identical, interchangeable main terminals; connects to protected line or ground reference point |
| MT2 | Main Terminal 2 | Second identical main terminal; completes crowbar path across protected circuit when triggered |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Crowbar Protection | Triggers symmetrically above ±240 V, eliminating need for back-to-back diodes or polarity-aware layout |
| Low Clamping Voltage | 4.0 V on-state voltage limits energy dissipation and downstream component stress during surge events |
| High Surge Current Rating | Supports 50 A peak (10×1000 µs) per GR-1089-CORE, enabling single-device protection for Category A/B/C telecom ports |
| Low Signal-Line Capacitance | 39 pF typical capacitance preserves high-frequency signal integrity on xDSL, ISDN, and VoIP interfaces |
| Pb-Free SMB Package | DO-214AA footprint enables automated assembly and meets RoHS requirements without derating |
Applications
| Central Office Line Cards | Digital Subscriber Line (xDSL) Interfaces |
|---|---|
Use Scenario: Protecting analog line interface circuits (ALIC) on carrier-grade DSLAM line cards from lightning-induced surges on copper loops. IC Role / Device Role / Timing Role: Primary crowbar protector placed between tip/ring and transceiver IC, clamping transients before they reach sensitive PHY components. Use Value: Enables compliance with GR-1089-CORE Level 3 (50 A, 10×1000 µs) using a single discrete device, reducing BOM count and PCB area vs. hybrid TVS+GDT solutions. |
Use Scenario: Safeguarding ADSL2+/VDSL2 line drivers and receivers against longitudinal surges on twisted-pair subscriber lines. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on differential pair, operating transparently during normal 1–30 MHz signal transmission. Use Value: 39 pF capacitance avoids attenuation in upstream/downstream bands; 170 V VDRM accommodates AC ringing voltages while maintaining margin to V(BO). |
| VoIP Gateway FXS Ports | Industrial Ethernet Media Converters |
Use Scenario: Securing foreign exchange station (FXS) ports in enterprise VoIP gateways against power cross and lightning surges on POTS lines. IC Role / Device Role / Timing Role: First-stage protector in series with isolation transformer secondary, shunting surge energy to ground before reaching SLIC and codec. Use Value: 240 V V(BO) provides sufficient margin above 120 Vrms ring voltage (≈170 Vpk), preventing nuisance triggering during normal operation. |
Use Scenario: Protecting RS-485/RS-232 data lines in industrial media converters deployed near outdoor cabling or motor drives. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on data pair, rated for IEC 61000-4-5 Level 3 (1 kV/2 Ω, 10×1000 µs) surge immunity. Use Value: SMB package allows direct placement at connector entry point; 150 mA IH ensures clean reset after surge without latch-up or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thyristor surge protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-01WTG | Unidirectional; 100 V VDRM; 150 V V(BO); TO-236 package; 120 pF capacitance | Requires back-to-back configuration for bidirectional protection; higher capacitance limits use in >10 MHz applications | Select only if unidirectional protection suffices and board space permits dual-device layout |
| onsemi NTVB170NSC-L | Same VDRM (170 V) and V(BO) (220 V); lower breakover voltage; identical SMB package and pinout | Slightly faster trigger response but reduced margin to AC ringing peaks; same thermal and surge ratings | Prefer NTVB170SA-L where higher V(BO) margin is needed for noisy or long-loop deployments |
Compared with SP1003-01WTG and NTVB170NSC-L, the NTVB170SA-L offers superior bidirectional simplicity, tighter capacitance control for broadband signals, and higher V(BO) margin-making it optimal for GR-1089-CORE-compliant telecom line cards requiring single-device, low-distortion protection.
Availability
NTVB170SA-L is available at Aetrix Electronics and suitable for central office line cards, xDSL interface modules, and VoIP gateway FXS ports requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for NTVB170SA-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 focused on energy-efficient innovation for automotive, industrial, cloud, and communications markets.
The NTVB Series is part of onsemi's circuit protection portfolio, engineered specifically for telecom infrastructure applications requiring high-reliability, bidirectional surge suppression with minimal signal impact.
FAQ
What is the primary function of the NTVB170SA-L in a telecom circuit?
The NTVB170SA-L functions as a bidirectional thyristor surge protector (TSPD), providing crowbar-type overvoltage protection on telecom line interfaces. When transient voltage exceeds ±240 V, it latches into low-impedance conduction to divert surge current away from sensitive downstream components. Its design ensures robust protection for central office, access network, and customer premises equipment per GR-1089-CORE and ITU-T K.20/21 standards - a core role fulfilled by every NTVB170SA-L unit deployed in compliant systems.
Does the NTVB170SA-L require a gate trigger signal to operate?
No, the NTVB170SA-L is a gateless, voltage-triggered device. It relies solely on intrinsic thyristor characteristics: conduction initiates automatically when applied voltage across MT1–MT2 exceeds the breakover voltage (V(BO) = 240 V) in either polarity. No external control signal, bias, or timing circuitry is needed - the NTVB170SA-L operates autonomously as a passive crowbar element, simplifying system design and improving reliability.
How does the NTVB170SA-L reset after conducting a surge event?
The NTVB170SA-L resets automatically when the current through MT1–MT2 falls below its holding current (IH = 150 mA). After surge energy dissipates and line current drops - such as during AC zero-crossing or post-surge decay - the device returns to its high-impedance off-state. This self-resetting behavior eliminates the need for external reset circuitry and ensures the NTVB170SA-L remains ready for subsequent transients without intervention.
Can the NTVB170SA-L be used in DC-powered circuits like PoE interfaces?
Yes, the NTVB170SA-L is suitable for DC applications including Power over Ethernet (PoE) data line protection, provided the steady-state DC voltage remains ≤170 V (VDRM) and well below 240 V (V(BO)). Its bidirectional symmetry and 150 mA holding current ensure stable operation during PoE mode transitions and surge events. Designers must verify that PoE voltage envelopes and fault currents align with NTVB170SA-L ratings before integration.
What is the significance of the "A" suffix in NTVB170SA-L?
The "A" in NTVB170SA-L denotes the specific variant within the NTVB170 family, corresponding to a marking code of "170A" on the device body and indicating a V(BO) rating of 240 V. This distinguishes it from other variants like NTVB170NSC-L (220 V V(BO)) or NTVB170SC-L (265 V V(BO)). The "-L" suffix confirms Pb-free packaging per JEDEC DO-214AA (SMB) standards - a consistent identifier across all NTVB170SA-L units shipped.
NTVB170SA-L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Breakover:
- 265V
- Voltage - Off State:
- 170V
- Voltage - On State:
- 4 V
- Current - Peak Pulse (8/20µs):
- -
- Current - Peak Pulse (10/1000µs):
- 50 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 1
- Capacitance:
- 39pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
NTVB170SA-L FAQ
1.How can I place an order for NTVB170SA-L through Aetrix?
Please submit a Request for Quotation (RFQ) for NTVB170SA-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 NTVB170SA-L reliable?
The price and inventory of NTVB170SA-L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NTVB170SA-L is usually 5 days.
3.What payment methods are accepted for NTVB170SA-L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NTVB170SA-L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NTVB170SA-L?
NTVB170SA-L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NTVB170SA-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 NTVB170SA-L?
For technical support, including NTVB170SA-L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NTVB170SA-L requirements.
6.How does Aetrix verify that NTVB170SA-L is sourced from the original manufacturer or authorized distributors?
All NTVB170SA-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 NTVB170SA-L meets industry standards.
7.What is the process for return or replacement of NTVB170SA-L?
All NTVB170SA-L units undergo pre-shipment inspection (PSI). If there is an issue with NTVB170SA-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 NTVB170SA-L part is unused and in its original packaging.
Return procedure for NTVB170SA-L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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