onsemi NP2600SCT3G

Overview

NP2600SCT3G from onsemi is a bidirectional thyristor surge protector (TSPD) designed for overvoltage clamping in telecom line interfaces. It features 220 V peak off-state voltage (V_DRM), 300 V breakover voltage (V_BO), 4.0 V on-state voltage (V_T), 150 mA holding current (I_H), and supports 500 A_(pk) 10×1000 µs surge current per GR-1089-CORE. It protects central office, access, and customer premises equipment.

For engineers reviewing the NP2600SCT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SMB package layout, telecom regulatory compliance (GR-1089-CORE, ITU-T K.20/21/45, IEC 61000-4-5), and real-world crowbar-mode protection behavior under transient surges.

Technical Context

The NP2600SCT3G operates as a voltage-triggered bidirectional crowbar device: it remains high-impedance below V_DRM = 220 V, switches to low-impedance conduction at V_BO = 300 V (both polarities), and latches until current falls below I_H = 150 mA. Its 4.0 V on-state voltage ensures minimal power dissipation during clamping.

It meets GR-1089-CORE Level C surge immunity (10×1000 µs, 100 A_(pk)) and ITU-T K.20/21 (10×700 µs, 75–100 A_(pk)). Capacitance is 33 pF at 1 MHz, minimizing signal distortion in voice/data lines.

Key Specifications

Pinout & Package

NP2600SCT3G uses the SMB (DO-214AA, Case 403C) surface-mount package - 4.06 mm × 3.30 mm × 2.11 mm body with gull-wing leads. Thermal resistance R_θJA is 90°C/W on FR4 PCB (3″×4.5″, 2 oz copper).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar thyristor surge protector applications.

Compared with NP2600SAT3G, NP2600SCT3G provides higher surge robustness (100 A_(pk) vs 75 A_(pk)) for mission-critical infrastructure; compared with SM2600SCT3G, it offers identical performance with onsemi-specific traceability and support channels.

Availability

NP2600SCT3G is available at Aetrix Electronics and suitable for DSL line interface protection, VoIP gateway surge suppression, and central office line card protection requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for NP2600SCT3G 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 NP Series thyristor surge protectors were developed specifically for telecom infrastructure protection - delivering high-voltage bidirectional clamping, low capacitance, and regulatory compliance in compact SMB packages.

FAQ

What is the maximum surge current rating for NP2600SCT3G under GR-1089-CORE Level C?

The NP2600SCT3G is rated for 100 A_(pk) under the 10×1000 µs double-exponential waveform per GR-1089-CORE Level C. This rating is validated with thermal derating applied and requires adequate PCB copper area for heat dissipation. The NP2600SCT3G achieves this without degradation when operated within its specified junction temperature range of −40°C to +150°C.

Does NP2600SCT3G require external trigger circuitry to operate?

No, the NP2600SCT3G is a self-triggering bidirectional thyristor - it conducts automatically when voltage across MT1–MT2 exceeds V_BO = 300 V in either polarity. No gate drive, bias, or control signal is needed. Once triggered, it remains latched until load current falls below I_H = 150 mA, making the NP2600SCT3G ideal for passive, fail-safe surge protection.

How does the 33 pF capacitance of NP2600SCT3G affect DSL signal integrity?

At 33 pF, the NP2600SCT3G introduces negligible insertion loss (<0.1 dB) and group delay variation across POTS (300–3400 Hz) and ADSL2+ (up to 2.2 MHz) bands. This low capacitance ensures minimal crosstalk and return loss impact - critical for maintaining SNR in multi-line DSLAM deployments where the NP2600SCT3G is commonly used.

Can NP2600SCT3G be used in DC-powered telecom circuits?

Yes - the NP2600SCT3G supports bidirectional operation with a 220 V V_DRM and 300 V V_BO, making it compatible with DC-biased telecom interfaces such as ISDN (±120 V) and powered VoIP line cards. Its symmetric characteristics ensure equal clamping performance regardless of DC offset polarity, and the NP2600SCT3G maintains full compliance with ITU-T K.20/21 under these conditions.

What is the thermal resistance and recommended PCB layout for NP2600SCT3G?

The NP2600SCT3G has a junction-to-ambient thermal resistance (R_θJA) of 90°C/W on a standard FR4 board (3″×4.5″, 2 oz copper, fan-out pattern). To sustain repeated surges, use ≥10 mm² copper pour connected to both MT1 and MT2 pads, avoid thermal relief on inner-layer connections, and ensure ≥2 mm clearance to adjacent components. This layout ensures the NP2600SCT3G remains within its 150°C max junction limit.