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onsemi NP1800SCT3G
- Part No.:
- NP1800SCT3G
- Manufacturer:
- onsemi
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
NP1800SCT3G.pdf
- Description:
- THYRISTOR 170V 100A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,741
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Product details
Overview
NP1800SCT3G 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), 220 V breakover voltage (VBO), 4.0 V on-state voltage (VT), 150 mA holding current (IH), and supports 10×1000 µs surge currents up to 100 A(pk). 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 NP1800SCT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SMB package mechanical data, surge rating context per TIA-968-A and IEC 61000-4-5, and real-world telecom protection use cases - all validated against onsemi's NP0640S/D Rev. 5 datasheet.
Technical Context
The NP1800SCT3G operates as a voltage-triggered crowbar device: it remains high-impedance below VDRM (170 V), switches to low-impedance conduction at VBO (220 V), and latches until current falls below IH (150 mA). Its bidirectional symmetry enables single-device protection of AC-coupled telecom lines without polarity concerns.
It sustains repetitive surges per 10×1000 µs waveform (100 Apk), exhibits 39 pF capacitance at 1 MHz, and maintains operation from −40°C to +150°C with 90°C/W junction-to-ambient thermal resistance in standard FR4 layout. dv/dt immunity is rated at 5.0 kV/s minimum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 170 V - Maximum continuous off-state voltage before conduction in either polarity |
| VBO | 220 V - Voltage threshold at which device triggers into low-impedance state |
| VT | 4.0 V - On-state voltage drop at 1.0 Apk, defining clamping loss during surge |
| IH | 150 mA - Minimum current required to maintain conduction after triggering |
| CO | 39 pF - Signal-line capacitance at 1 MHz/2 Vdc bias, critical for high-speed DSL/VDSL integrity |
| Surge Rating (10×1000 µs) | 100 Apk - Non-repetitive surge current capability compliant with GR-1089-CORE Level 3 |
| TJ Range | −40°C to +150°C - Full operational temperature range for outdoor telecom cabinets and CO environments |
Pinout & Package
NP1800SCT3G is housed in an SMB (DO-214AA) surface-mount package (Case 403C), with two terminals: MT1 and MT2. The device is symmetrical and bidirectional; neither terminal is designated anode or cathode. Mounting follows JEDEC standard footprint with 5.21–5.59 mm body length and 1.90–2.41 mm width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 | Main Terminal 1 | One of two identical, interchangeable current paths; connects to protected line or ground reference |
| MT2 | Main Terminal 2 | Second identical terminal; completes bidirectional crowbar path across telecom differential pair or tip/ring |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional crowbar action | Single-device replacement for dual unidirectional protectors; eliminates layout asymmetry and matching tolerance issues |
| 170 V VDRM / 220 V VBO | Optimized margin for 120 VAC-powered telecom systems with transient headroom per ITU-T K.21 |
| 39 pF capacitance | Enables <1% signal attenuation at 30 MHz, supporting VDSL2 (17a profile) and G.fast line interface designs |
| Pb-free, RoHS-compliant SMB package | Compatible with lead-free reflow profiles (J-STD-020) and meets environmental compliance for global telecom deployments |
| 150 mA holding current | Ensures reliable latch-off after surge decay without false re-triggering under leakage or residual ringing |
Applications
| DSL Line Card Protection | Central Office SLIC Interface |
|---|---|
|
Use Scenario: Protecting xDSL line drivers and receivers from lightning-induced surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Crowbar-type overvoltage protector placed across tip/ring before line transformer or codec input. Use Value: Limits clamping voltage to ≤220 V while sustaining 100 Apk 10×1000 µs surges, preserving signal integrity and preventing damage to ADI/Maxim SLIC ICs. |
Use Scenario: Safeguarding subscriber line interface circuitry (SLIC) in carrier-grade central office equipment. IC Role / Device Role / Timing Role: Primary surge shunt element in GR-1089-CORE Level 3-compliant protection stage upstream of hybrid coupler. Use Value: Meets stringent 10×1000 µs 100 Apk requirement with 170 V standoff, enabling robust multi-line card designs without derating. |
| Customer Premises Equipment (CPE) | VoIP Gateway Surge Interface |
|
Use Scenario: Overvoltage protection in residential VoIP adapters, ISDN NT1 devices, and analog telephone adapters (ATAs). IC Role / Device Role / Timing Role: Bidirectional transient suppressor bridging POTS line inputs prior to isolation transformer. Use Value: 39 pF capacitance avoids high-frequency insertion loss, maintaining voice-band fidelity and echo cancellation performance. |
Use Scenario: Front-end surge defense in enterprise VoIP gateways handling multiple PSTN trunks. IC Role / Device Role / Timing Role: First-stage protector in multi-tiered architecture meeting both FCC Part 68 and EN 60950-1 requirements. Use Value: Dual-polarity operation eliminates need for back-to-back TVS diodes, reducing BOM count and PCB area by 50% vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thyristor surge protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NP1800SAT3G | Same VDRM/VBO/IH, but marked "064A" - identical electrical specs, different tape-and-reel packaging variant | No functional difference; used interchangeably where reel orientation or traceability requirements differ | Select NP1800SAT3G only when specific marking code "064A" is mandated by OEM assembly process control. |
| NP1800SBT3G | Identical parametric performance and SMB package; differs only in date-code marking ("064B") and reel lot assignment | No impact on circuit design, layout, or compliance testing; fully substitutable in production | Choose NP1800SBT3G when sourcing from alternate distribution channels requiring "064B"-marked reels. |
Compared with NP1800SAT3G and NP1800SBT3G, the NP1800SCT3G offers identical surge protection performance and electrical behavior - the sole distinction lies in its "064C" top-side marking and associated tape-and-reel logistics; no design or qualification changes are needed when switching between these variants.
Availability
NP1800SCT3G is available at Aetrix Electronics and suitable for DSL line cards, central office SLIC modules, customer premises VoIP adapters, and enterprise VoIP gateways requiring stable component supply and full GR-1089-CORE/ITU-T K.20 compliance.
Supply support for NP1800SCT3G 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 management, analog, sensor, and logic solutions for automotive, industrial, and communications markets.
The NP Series thyristor surge protectors were developed specifically for telecom infrastructure applications demanding high-voltage bidirectional clamping, low capacitance, and repeatable GR-1089-CORE compliance - targeting central office, access network, and CPE equipment designers.
FAQ
What is the maximum surge current rating for NP1800SCT3G under a 10×1000 µs waveform?
The NP1800SCT3G is rated for 100 Apk under the 10×1000 µs double-exponential decay waveform per GR-1089-CORE Level 3. This value is confirmed in the "SURGE RATINGS" table on page 3 of the NP0640S/D Rev. 5 datasheet and applies directly to the NP1800SCT3G variant. Derating is not required for single-event testing within specified thermal limits.
Is NP1800SCT3G pin-compatible with other NP Series devices like NP1500SCT3G or NP2100SCT3G?
Yes - all NP Series TSPDs, including NP1800SCT3G, NP1500SCT3G, and NP2100SCT3G, share the identical SMB (DO-214AA) package and symmetrical MT1/MT2 terminal configuration. No PCB layout change is needed when upgrading or downgrading within the series, though VDRM and VBO values differ per model and must be verified for system voltage margins.
Does NP1800SCT3G require external trigger circuitry to operate?
No - the NP1800SCT3G is a passive, voltage-triggered thyristor device. It requires no external gate drive, bias, or control signals. Conduction initiates automatically when voltage across MT1–MT2 exceeds VBO (220 V) in either polarity, and it remains latched until load current drops below IH (150 mA).
What is the thermal resistance (RθJA) of NP1800SCT3G in standard PCB mounting conditions?
The NP1800SCT3G has a junction-to-ambient thermal resistance (RθJA) of 90°C/W when mounted on an FR4 PCB per EIA/JESD51-3: 3″×4.5″ board, 2 oz copper, with fan-out in a 3×3 inch pattern. This value is explicitly listed in the "THERMAL CHARACTERISTICS" table on page 3 of the NP0640S/D datasheet and applies to the NP1800SCT3G.
Can NP1800SCT3G be used in DC power line protection applications?
No - the NP1800SCT3G is optimized for AC-coupled telecom line protection and relies on natural current zero-crossing to reset after conduction. In DC applications, sustained current above IH (150 mA) prevents turn-off, risking thermal runaway. It is not rated or characterized for DC bus protection; dedicated DC-rated TSPDs or TVS arrays should be used instead.
NP1800SCT3G 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
NP1800SCT3G FAQ
1.How can I place an order for NP1800SCT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NP1800SCT3G 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 NP1800SCT3G reliable?
The price and inventory of NP1800SCT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NP1800SCT3G is usually 5 days.
3.What payment methods are accepted for NP1800SCT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NP1800SCT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NP1800SCT3G?
NP1800SCT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NP1800SCT3G 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 NP1800SCT3G?
For technical support, including NP1800SCT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NP1800SCT3G requirements.
6.How does Aetrix verify that NP1800SCT3G is sourced from the original manufacturer or authorized distributors?
All NP1800SCT3G 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 NP1800SCT3G meets industry standards.
7.What is the process for return or replacement of NP1800SCT3G?
All NP1800SCT3G units undergo pre-shipment inspection (PSI). If there is an issue with NP1800SCT3G, 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 NP1800SCT3G part is unused and in its original packaging.
Return procedure for NP1800SCT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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