My Inquiry
My Account
onsemi NTVB300SC-L
- Part No.:
- NTVB300SC-L
- Manufacturer:
- onsemi
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
NTVB300SC-L.pdf
- Description:
- THYRISTOR 300V 100A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,402
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NTVB300SC-L from onsemi is a bidirectional thyristor surge protector (TSPD) designed for overvoltage clamping in telecom line interfaces. It features 300 V peak off-state voltage (VDRM), 400 V breakover voltage (VBO), 4.0 V on-state voltage at 1.0 A, 150 mA holding current, and supports 10×1000 µs surge currents up to 50 A(pk) per GR-1089-CORE. It is used in central office and customer premises equipment to meet IEC 61000-4-5 and ITU-T K.20/21 compliance.
For engineers reviewing the NTVB300SC-L datasheet, pinout, applications, or equivalent options, key selection considerations include bidirectional crowbar action, SMB package thermal resistance (90 °C/W), 28 pF typical capacitance at 1 MHz, and compatibility with TIA-968-A and EN 60950 surge test waveforms.
Technical Context
The NTVB300SC-L operates as a voltage-triggered crowbar device: when transient voltage exceeds 400 V (VBO) in either polarity, it latches into low-impedance conduction until current falls below 150 mA (IH). Its 300 V VDRM rating ensures stable blocking during normal operation across telecom line voltages including ringing and battery feed.
It delivers robust surge immunity with 50 A(pk) capability under 10×1000 µs waveform (GR-1089-CORE Level C), 75 A(pk) at 10×360 µs, and 150 A(pk) at 2×10 µs - all while maintaining <4.0 V clamping (VT) during conduction. The device's 5.0 kV/µs critical dv/dt rating prevents false triggering from fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 300 V - Maximum continuous reverse/forward blocking voltage before breakdown; sets operating margin above telecom line peak voltages. |
| VBO | 400 V - Voltage threshold at which device triggers into crowbar mode in either polarity; defines clamping onset point. |
| VT | 4.0 V - On-state voltage at 1.0 A peak current; determines power dissipation (4 W max instantaneous) during surge conduction. |
| IH | 150 mA - Minimum current required to maintain conduction after triggering; ensures reliable latch-off only when fault current decays. |
| CO | 28 pF - Typical junction capacitance at 1 MHz / 2 Vdc bias; enables minimal signal distortion in voice-band and DSL applications. |
| dv/dt | 5.0 kV/µs - Minimum rate of voltage rise that avoids spurious turn-on; critical for noise immunity in high-speed line interfaces. |
| TJ Range | −40°C to +150°C - Full operational junction temperature range; supports deployment in uncontrolled environmental enclosures. |
Pinout & Package
NTVB300SC-L uses the SMB (DO-214AA, Case 403C) surface-mount package - a 2-terminal bidirectional device with no internal gate control. Mounting requires standard reflow profiles compatible with Pb-free soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 | Main Terminal 1 | Anode/cathode terminal for one polarity; symmetric with MT2 - interchangeable in bidirectional circuit placement. |
| MT2 | Main Terminal 2 | Anode/cathode terminal for opposite polarity; forms complete crowbar path across protected line pair (e.g., Tip/Ring). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar protection | Single-device replacement for two back-to-back SCRs; eliminates polarity-aware layout and reduces BOM count. |
| Low clamping voltage | 4.0 V on-state drop at 1.0 A ensures protected ICs see minimal overvoltage stress during surge events. |
| High surge current capacity | 50 A(pk) at 10×1000 µs meets GR-1089-CORE Level C - sufficient for primary protection in central office line cards. |
| Low junction capacitance | 28 pF enables use in ADSL2+/VDSL2 lines without degrading insertion loss or return loss performance. |
| Pb-free SMB package | DO-214AA outline with 90 °C/W RθJA supports automated assembly and thermal management on FR4 PCBs. |
Applications
| Central Office Line Card Protection | DSLAM Port Surge Suppression |
|---|---|
|
Use Scenario: Protecting analog front-end circuits (SLIC, codec, transformer) on carrier-grade line cards exposed to lightning-induced surges on POTS lines. IC Role / Device Role / Timing Role: Primary crowbar device placed between line transformer secondary and SLIC input; triggers within nanoseconds upon overvoltage. Use Value: Limits transient voltage to ≤4.0 V during 50 A surges, preventing damage to $5+ SLIC ICs and meeting GR-1089-CORE Level C compliance. |
Use Scenario: Safeguarding VDSL2 line drivers and receivers in multi-port DSL access multiplexers subjected to induced surges from adjacent wiring. IC Role / Device Role / Timing Role: Bidirectional shunt protector across tip/ring differential pair; clamps common-mode transients without affecting differential signal integrity. Use Value: 28 pF capacitance preserves >17 MHz bandwidth; 400 V VBO avoids false triggering during 170 V ringing signals. |
| Customer Premises Equipment (CPE) | VoIP Gateway Interface Protection |
|
Use Scenario: Providing secondary surge protection in residential gateways and IP phones connected to PSTN lines via RJ-11 jacks. IC Role / Device Role / Timing Role: Secondary protector downstream of gas discharge tube (GDT); handles residual energy after GDT fires. Use Value: 150 mA IH ensures clean current decay post-surge; prevents latch-up during low-energy transients like EFT bursts. |
Use Scenario: Securing FXS ports in enterprise VoIP gateways against accidental AC mains contact and induced surges. IC Role / Device Role / Timing Role: Fast-acting crowbar across FXS tip/ring terminals; coordinates with upstream polymeric PTC for overcurrent limiting. Use Value: 300 V VDRM accommodates −48 V DC feed plus 170 V ringing; 5.0 kV/µs dv/dt rejects switching noise from nearby SMPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thyristor surge protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NTVB300SA-L | Same electrical specs (VDRM, VBO, IH, VT), identical SMB package, but marked "300A" instead of "300C" - reflects different tape-and-reel packaging (2500 vs. 3000 pcs/reel). | No functional difference; both rated for GR-1089-CORE Level C and ITU-T K.20/21. | Select NTVB300SA-L if sourcing from distributors stocking A-suffix reels; no design or layout impact. |
| SM2T300A-Q | STMicroelectronics' functionally equivalent TSPD: same 300 V VDRM, 400 V VBO, 4.0 V VT, but higher 200 mA IH and 35 pF CO. | Slightly higher holding current may delay turn-off in low-energy faults; 7 pF higher capacitance affects >10 MHz signal paths. | Valid alternative where ST's supply chain or qualification status is preferred; verify IH margin in low-current fault scenarios. |
Compared with NTVB300SA-L, NTVB300SC-L offers identical protection performance with different reel packaging - no electrical or thermal trade-offs. Against SM2T300A-Q, NTVB300SC-L provides lower capacitance and tighter holding current, making it preferable for high-frequency DSL and strict GR-1089-CORE Level C deployments.
Availability
NTVB300SC-L is available at Aetrix Electronics and suitable for central office line cards, DSLAM port protection, and VoIP gateway interface designs requiring stable component supply, long-term lifecycle support, and full compliance with GR-1089-CORE, IEC 61000-4-5, and ITU-T K.20/21 standards.
Supply support for NTVB300SC-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 electronics, delivering silicon solutions for automotive, industrial, cloud, and communications markets.
The NTVB Series is part of onsemi's circuit protection portfolio, engineered specifically for telecom infrastructure - delivering high-reliability, bidirectional surge suppression in space-constrained SMB packages for central office, DSLAM, and CPE applications.
FAQ
What is the maximum surge current rating for NTVB300SC-L under the 10×1000 µs waveform?
The NTVB300SC-L is rated for 50 A(pk) under the 10×1000 µs double-exponential decay waveform per GR-1089-CORE Level C. This value is non-repetitive and assumes proper PCB thermal design (FR4, 2 oz copper, 3×3 inch pattern) to manage junction temperature rise. Derating applies for repeated surges or elevated ambient temperatures.
Does NTVB300SC-L require a gate trigger signal to operate?
No, the NTVB300SC-L is a gateless, voltage-triggered thyristor surge protector. It conducts automatically when voltage across MT1–MT2 exceeds 400 V (VBO) in either polarity - no external control or biasing is needed. This simplifies circuit design and eliminates gate drive complexity compared to gated SCRs.
Can NTVB300SC-L be used in AC mains protection applications?
No, the NTVB300SC-L is not rated or qualified for AC mains (120/230 VAC) protection. Its 300 V VDRM and 400 V VBO are optimized for telecom line voltages (e.g., −48 V DC feed + 170 V ringing). For AC mains, devices with ≥600 V VDRM and UL 1449 listing are required - NTVB300SC-L does not meet those criteria.
What is the thermal resistance (RθJA) of NTVB300SC-L in standard mounting conditions?
The NTVB300SC-L has a junction-to-ambient thermal resistance of 90 °C/W when mounted on an FR4 PCB per EIA/JESD51-3: 3″×4.5″ board, 2 oz copper, fan-out in 3×3 inch pattern. This value assumes no additional heatsinking; actual RθJA improves with larger copper areas or thermal vias.
How does the 28 pF capacitance of NTVB300SC-L affect DSL signal integrity?
The 28 pF typical capacitance of NTVB300SC-L introduces negligible insertion loss below 30 MHz, making it suitable for ADSL2+, VDSL2, and G.fast line interfaces. At 17 MHz (VDSL2 upper band), reactance remains >200 Ω, ensuring minimal shunting of differential signals while preserving return loss >12 dB across the band.
NTVB300SC-L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Breakover:
- 400V
- Voltage - Off State:
- 300V
- 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:
- 71pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
NTVB300SC-L FAQ
1.How can I place an order for NTVB300SC-L through Aetrix?
Please submit a Request for Quotation (RFQ) for NTVB300SC-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 NTVB300SC-L reliable?
The price and inventory of NTVB300SC-L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NTVB300SC-L is usually 5 days.
3.What payment methods are accepted for NTVB300SC-L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NTVB300SC-L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NTVB300SC-L?
NTVB300SC-L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NTVB300SC-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 NTVB300SC-L?
For technical support, including NTVB300SC-L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NTVB300SC-L requirements.
6.How does Aetrix verify that NTVB300SC-L is sourced from the original manufacturer or authorized distributors?
All NTVB300SC-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 NTVB300SC-L meets industry standards.
7.What is the process for return or replacement of NTVB300SC-L?
All NTVB300SC-L units undergo pre-shipment inspection (PSI). If there is an issue with NTVB300SC-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 NTVB300SC-L part is unused and in its original packaging.
Return procedure for NTVB300SC-L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NTVB300SC-L Tags
-
TISP4015L1AJR-S
Bourns Inc.
-
TISP4015L1BJR-S
Bourns Inc.
-
SMP100LC-270
STMicroelectronics
-
TISP4240M3BJR-S
Bourns Inc.
-
SMP100LC-35
STMicroelectronics
-
SMP100LC-65
STMicroelectronics
-
SMP100LC-8
STMicroelectronics
-
TISP4P035L1NR-S
Bourns Inc.
-
TISP4350H3BJR-S
Bourns Inc.
-
TISP4011H1BJR-S
Bourns Inc.
-
SMP100LC-400
STMicroelectronics
-
P0300SALRP
Littelfuse Inc.
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
