onsemi NP0900SAT3G

Overview

NP0900SAT3G from onsemi is a bidirectional thyristor surge protector (TSPD) designed for overvoltage protection in telecom line interfaces. It features 75 V peak off-state voltage (V_DRM), 98 V breakover voltage (V_BO), 4.0 V on-state voltage at 1.0 A, 150 mA holding current, and supports 75 A peak surge current under 10×360 µs waveform - deployed in central office and customer premises equipment to meet GR-1089-CORE and ITU-T K.20 compliance.

For engineers reviewing the NP0900SAT3G datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional crowbar action, SMB package thermal resistance (90 °C/W), low capacitance (65 pF at 1 MHz), compliance with IEC 61000-4-5 Level 4, and compatibility with TIA-968-A surge test profiles.

Technical Context

The NP0900SAT3G operates as a voltage-triggered bidirectional crowbar device: it remains high-impedance below V_DRM (75 V), switches to low-impedance conduction above V_BO (98 V), and latches until current falls below I_H (150 mA). Its dv/dt rating of 5.0 kV/s ensures immunity to false triggering during fast transients.

Designed for telecom primary protection, it handles repetitive surge stress per GR-1089-CORE (2×10 µs, 10×360 µs) and TIA-968-A (10×160 µs), with thermal resistance of 90 °C/W enabling reliable operation up to +150 °C junction temperature in FR4 PCB layouts.

Key Specifications

Pinout & Package

NP0900SAT3G is housed in an SMB (DO-214AA, Case 403C) surface-mount package with two terminals: MT1 and MT2. The package measures 4.06–4.57 mm × 3.30–3.81 mm × 1.90–2.41 mm and is RoHS-compliant (Pb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NP0900SBT3G and NP0900SCT3G, the NP0900SAT3G provides balanced performance for GR-1089-CORE 10×360 µs surge immunity - making it optimal for multi-service access platforms where both duration and amplitude robustness are required without over-specifying cost or footprint.

Availability

NP0900SAT3G is available at Aetrix Electronics and suitable for DSL line cards, VoIP gateways, central office SLIC modules, and ISDN BRI interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant surge protection.

Supply support for NP0900SAT3G 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, sensing, and connectivity solutions for automotive, industrial, cloud, and communications markets.

The NP Series thyristor surge protectors were developed specifically for telecom infrastructure applications - delivering high-surge robustness, bidirectional symmetry, and low-capacitance line protection in compact SMB packages.

FAQ

What is the maximum operating temperature for NP0900SAT3G?

The NP0900SAT3G has a specified operating junction temperature range of −40 °C to +150 °C. This wide range enables deployment in uncontrolled environments such as outdoor DSLAM cabinets or central office frames where ambient temperatures may exceed 85 °C. Thermal resistance (R_θJA) is 90 °C/W on standard FR4 PCBs, allowing direct thermal design validation without additional heatsinking.

Does NP0900SAT3G require external trigger circuitry?

No, the NP0900SAT3G is a self-triggering bidirectional thyristor surge protector. It requires no external gate drive or control signals - conduction initiates automatically when voltage across MT1–MT2 exceeds V_BO (98 V) in either polarity. Once triggered, it remains latched until load current falls below I_H (150 mA), then resets to high-impedance state.

How does NP0900SAT3G compare to MOV-based protectors in telecom applications?

Unlike metal-oxide varistors (MOVs), the NP0900SAT3G offers precise, repeatable V_BO (98 V) with minimal degradation after repeated surges, lower leakage (<5 µA), and stable 65 pF capacitance - critical for maintaining DSL/VoIP signal fidelity. MOVs exhibit parameter drift and higher capacitance (>1000 pF), making NP0900SAT3G preferred for high-speed data line protection.

Is NP0900SAT3G compatible with lead-free reflow soldering processes?

Yes, the NP0900SAT3G is marked with "G" indicating Pb-free and RoHS-compliant construction. It is qualified for standard lead-free reflow profiles (J-STD-020, peak 260 °C), with package dimensions conforming to JEDEC DO-214AA (SMB) specifications. The device's thermal resistance and solder pad layout align with IPC-7351B recommendations for 2 oz copper FR4 boards.

What standards does NP0900SAT3G help satisfy in telecom equipment design?

The NP0900SAT3G supports compliance with GR-1089-CORE (Level 3, 10×360 µs), ITU-T K.20/K.21/K.45, IEC 61000-4-5 (Level 4), TIA-968-A, FCC Part 68, EN 60950, and UL 1950. Its validated surge ratings and bidirectional symmetry eliminate the need for dual-device configurations, simplifying certification test setups and reducing bill-of-materials complexity.