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onsemi NP1800SCMCT3G
- Part No.:
- NP1800SCMCT3G
- Manufacturer:
- onsemi
- Category:
- Thyristors
- Package:
- DO-214AA, SMB
- Datasheet:
-
NP1800SCMCT3G.pdf
- Description:
- THYRISTOR 170V 400A DO-214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,878
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Product details
Overview
NP1800SCMCT3G from onsemi is a bidirectional ultra-low-capacitance thyristor surge protection device (TSPD) designed for telecom line protection in T1/E1 and xDSL interfaces. It features ±170 V repetitive peak off-state voltage (VDRM), ±220 V breakover voltage (V(BO)), 23 pF nominal off-state capacitance at 1.0 MHz, 4 V on-state voltage at 2.2 A, and 150 mA holding current - enabling low-distortion, high-speed transient clamping without signal integrity loss.
For engineers reviewing the NP1800SCMCT3G datasheet, pinout, applications, or equivalent options, this device is selected for telecom surge compliance (GR-1089-CORE, ITU-T K.20/K.21), low-capacitance line interface protection, and crowbar-mode overvoltage suppression in bidirectional AC/DC data lines.
Technical Context
The NP1800SCMCT3G operates as a voltage-triggered bidirectional crowbar device: it remains high-impedance (open-circuit) under normal operation (IDRM ≤ 5 µA at VDRM), then switches to low-impedance conduction when transient voltage exceeds V(BO) = ±220 V. Its ultra-low 23 pF off-state capacitance ensures minimal insertion loss and phase distortion up to 100 MHz.
It supports non-repetitive surge currents up to 150 A (2×10 µs), 75 A (10×360 µs), and 50 A (10×1000 µs), with thermal resistance RθJA = 90 °C/W on FR4 PCB. The device complies with ULTRA LOW CAPACITANCE BIDIRECTIONAL SURFACE MOUNT THYRISTOR standards per JEDEC DO-214AA (SMB) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | ±170 V - maximum continuous peak voltage before triggering; must exceed system operating voltage (e.g., 150 Vrms T1 ring voltage ≈ 212 V peak) |
| V(BO) | ±220 V - guaranteed maximum clamping voltage seen by protected circuit; defines protection threshold against equipment failure |
| Co | 23 pF at 1.0 MHz / 2 Vdc - enables <0.1 dB insertion loss in 100 Ω DSL/T1 lines up to 30 MHz |
| VT | 4 V at 2.2 A - low on-state voltage allows safe dissipation of 500+ A surge energy in SMB package without thermal runaway |
| IH | 150 mA - minimum current required to sustain conduction; must exceed system fault-hold current to auto-reset after surge |
| IDRM | 5 µA at VDRM - ultra-low leakage preserves DC bias stability and prevents false triggering in voice/data hybrid circuits |
| IPPS (2×10 µs) | 150 A - peak surge capability meets GR-1089-CORE Category A requirements for central office equipment |
Pinout & Package
NP1800SCMCT3G is housed in a JEDEC DO-214AA (SMB) surface-mount package with two terminals: Cathode (K) and Anode (A). The package measures 4.57 mm × 3.81 mm × 2.11 mm (L × W × H), with gull-wing leads optimized for automated placement and reflow soldering on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive surge path terminal | Bidirectional conduction: accepts positive transients relative to Cathode; forms symmetrical crowbar with Cathode |
| Cathode (K) | Negative surge path terminal | Bidirectional conduction: accepts negative transients relative to Anode; completes low-impedance shunt path to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low off-state capacitance | 23 pF - preserves signal integrity in broadband T1/E1 (1.544/2.048 Mbps) and ADSL2+ (24 Mbps) lines |
| Pb-free, RoHS-compliant SMB package | DO-214AA footprint - compatible with standard SMT assembly processes and IPC-7351B land patterns |
| Precise bidirectional breakover voltage | ±220 V - tight V(BO) tolerance ensures consistent clamping across temperature (−40°C to +150°C) |
| Low on-state voltage | 4 V at 2.2 A - minimizes I²R heating during 150 A surges, enabling reliable operation without external heatsinking |
| High surge current rating | 150 A (2×10 µs) - satisfies GR-1089-CORE Level A immunity for telecom central office equipment |
Applications
| T1/E1 Line Interface Protection | xDSL Central Office Equipment |
|---|---|
Use Scenario: Protecting balanced T1 (1.544 Mbps) or E1 (2.048 Mbps) data lines from lightning-induced surges in carrier-grade multiplexers and channel banks. IC Role / Device Role / Timing Role: Bidirectional crowbar protector placed across tip/ring pair; triggers only during >±220 V transients while remaining transparent at ±150 V peak operating voltage. Use Value: 23 pF capacitance avoids attenuation of high-frequency T1 eye diagram; 150 A surge rating meets GR-1089-CORE Category A test requirements. | Use Scenario: Safeguarding ADSL2+ line cards in DSLAMs against induced surges from nearby power lines or lightning strikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on copper subscriber loops; installed differential across line pairs upstream of SLIC and transformer. Use Value: Low 5 µA IDRM prevents DC bias shift in voice-band analog circuits; ±170 V VDRM accommodates 48 V battery + 150 V ringing voltage combinations. |
| Telecom Customer Premises Equipment | Broadband Data Transmission Interfaces |
Use Scenario: Surge protection in residential DSL modems, ISDN NT1 devices, and VoIP gateways connected to PSTN lines. IC Role / Device Role / Timing Role: Fail-safe crowbar device that shorts transients to ground while maintaining open-circuit behavior during normal 48 V DC + 150 V AC ringing operation. Use Value: 150 mA IH ensures automatic recovery after surge; RoHS-compliant SMB package supports automated manufacturing for cost-sensitive CPE. | Use Scenario: Protecting high-speed serial interfaces (e.g., V.35, HDSL) in network access servers and remote concentrators. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor placed directly at connector entry points to minimize stub length and preserve impedance matching. Use Value: 23 pF Co enables >30 MHz bandwidth preservation; ±220 V V(BO) provides margin above 100 V common-mode surge test levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thyristor surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NP1800SCMC | Same electrical specs; differs only in packaging - bulk (no tape/reel) vs. NP1800SCMCT3G's 2500-piece tape-and-reel | No functional difference; used in manual prototyping or low-volume assembly where reel feeding is unnecessary | Select NP1800SCMC for evaluation or small-batch builds; NP1800SCMCT3G for automated SMT production |
| SMBJ170CA | TVS diode (not thyristor); unidirectional clamping; higher capacitance (≈100 pF); lower surge rating (100 A, 10×1000 µs) | Lacks crowbar action - clamps rather than short-circuits; unsuitable for sustained overvoltage events requiring fail-safe short | Choose SMBJ170CA only for lower-cost, lower-performance applications where crowbar behavior and sub-30 pF capacitance are not required |
Compared with NP1800SCMCT3G, NP1800SCMC offers identical protection performance in bulk form but lacks tape-and-reel logistics support, while SMBJ170CA trades crowbar reliability and ultra-low capacitance for simpler TVS architecture and lower cost - making it suitable only for non-critical, lower-bandwidth interfaces.
Availability
NP1800SCMCT3G is available at Aetrix Electronics and suitable for T1/E1 line interface protection, xDSL central office equipment, and telecom customer premises equipment requiring stable component supply, RoHS-compliant sourcing, and GR-1089-CORE certification support.
Supply support for NP1800SCMCT3G 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 manufacturer specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, cloud computing, and communications markets.
The NPMC Series, including NP1800SCMCT3G, was engineered specifically for telecom line protection - delivering ultra-low capacitance, precise bidirectional clamping, and robust surge immunity to meet stringent GR-1089-CORE and ITU-T K.20/K.21 standards.
FAQ
What is the primary function of the NP1800SCMCT3G in a telecom circuit?
The NP1800SCMCT3G functions as a bidirectional thyristor surge protection device (TSPD) that remains transparent during normal operation (≤±170 V) and triggers into a low-impedance crowbar state when transient voltage exceeds ±220 V. This safely shunts damaging surges to ground while preserving signal integrity in T1/E1 and xDSL lines due to its 23 pF off-state capacitance. The NP1800SCMCT3G is explicitly designed for fail-safe overvoltage protection in telecom infrastructure.
Does the NP1800SCMCT3G meet GR-1089-CORE compliance requirements?
Yes, the NP1800SCMCT3G is qualified to meet GR-1089-CORE Category A surge immunity requirements, supporting 150 A peak pulse current (2×10 µs waveform) and 75 A (10×360 µs), as documented in the official onsemi NPMC Series datasheet. Its ±170 V VDRM and ±220 V V(BO) ensure compatibility with central office equipment voltage margins, and the device is listed among components recognized for GR-1089-CORE, ITU-T K.20/K.21, and FCC Part 68 compliance. The NP1800SCMCT3G delivers certified protection without requiring additional external circuitry.
What is the significance of the "T3G" suffix in NP1800SCMCT3G?
The "T3G" suffix in NP1800SCMCT3G indicates a Pb-free, RoHS-compliant device supplied in 2500-piece tape-and-reel packaging per JEDEC standard. The "T" denotes tape-and-reel format, "3" specifies the reel size (standard 13-inch reel), and "G" confirms lead-free construction. This packaging enables direct use in automated SMT assembly lines, and the NP1800SCMCT3G's SMB (DO-214AA) footprint aligns with IPC-7351B land pattern recommendations for reliable reflow soldering.
How does the NP1800SCMCT3G differ from standard TVS diodes like SMBJ170CA?
Unlike unidirectional TVS diodes such as SMBJ170CA, the NP1800SCMCT3G is a bidirectional thyristor-based crowbar device with ultra-low 23 pF capacitance, precise ±220 V breakover voltage, and inherent fail-safe short-circuit behavior during overvoltage. SMBJ170CA offers higher capacitance (~100 pF), lower surge rating (100 A), and clamping (not crowbar) operation - making it unsuitable for sustained overvoltage events where automatic reset and minimal signal distortion are critical. The NP1800SCMCT3G is engineered specifically for telecom line protection where these attributes are mandatory.
Can the NP1800SCMCT3G be used in both AC and DC telecom applications?
Yes, the NP1800SCMCT3G is fully bidirectional and rated for both AC and DC telecom applications. Its ±170 V VDRM and ±220 V V(BO) accommodate combined DC battery feed (e.g., −48 V) and AC ringing voltages (e.g., 150 Vrms ≈ 212 V peak) found in T1/E1 and xDSL systems. The device remains non-conductive below VDRM, handles continuous DC bias, and triggers symmetrically on either polarity of transient surge - making the NP1800SCMCT3G suitable for tip/ring protection in mixed-signal telecom interfaces without polarity concerns.
NP1800SCMCT3G 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):
- 400 A
- Current - Peak Pulse (10/1000µs):
- 100 A
- Current - Hold (Ih):
- 150 mA
- Number of Elements:
- 1
- Capacitance:
- 33pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
NP1800SCMCT3G FAQ
1.How can I place an order for NP1800SCMCT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NP1800SCMCT3G 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 NP1800SCMCT3G reliable?
The price and inventory of NP1800SCMCT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NP1800SCMCT3G is usually 5 days.
3.What payment methods are accepted for NP1800SCMCT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NP1800SCMCT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NP1800SCMCT3G?
NP1800SCMCT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NP1800SCMCT3G 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 NP1800SCMCT3G?
For technical support, including NP1800SCMCT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NP1800SCMCT3G requirements.
6.How does Aetrix verify that NP1800SCMCT3G is sourced from the original manufacturer or authorized distributors?
All NP1800SCMCT3G 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 NP1800SCMCT3G meets industry standards.
7.What is the process for return or replacement of NP1800SCMCT3G?
All NP1800SCMCT3G units undergo pre-shipment inspection (PSI). If there is an issue with NP1800SCMCT3G, 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 NP1800SCMCT3G part is unused and in its original packaging.
Return procedure for NP1800SCMCT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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