onsemi NP1500SAT3G

Overview

NP1500SAT3G from onsemi is a bidirectional thyristor surge protector (TSPD) designed for overvoltage clamping in telecom line interfaces. It features 140 V peak off-state voltage (V_DRM), 180 V breakover voltage (V_BO), 4.0 V on-state voltage (V_T), 150 mA holding current (I_H), and supports 500 A_(pk) non-repetitive surge current under 10×1000 µs waveform - deployed in central office and customer premises equipment to meet GR-1089-CORE and IEC 61000-4-5 compliance.

For engineers reviewing the NP1500SAT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SMB package mechanical data, telecom-specific surge ratings, thermal resistance (90 °C/W), and direct alternatives aligned with ITU-T K.20/21 and TIA-968-A test requirements.

Technical Context

The NP1500SAT3G operates as a voltage-triggered crowbar device: it remains high-impedance below V_DRM (140 V), switches to low-impedance conduction at V_BO (180 V ±5%), and latches until current falls below I_H (150 mA). Its bidirectional symmetry enables protection of AC-coupled telecom lines without polarity constraints.

It sustains 500 A_(pk) surge current per GR-1089-CORE 10×1000 µs waveform while maintaining <4.0 V clamping (V_T) during conduction, and exhibits 44 pF typical capacitance at 1 MHz - critical for preserving signal integrity in DSL, xDSL, and ISDN line cards.

Key Specifications

Pinout & Package

NP1500SAT3G uses the SMB (DO-214AA, Case 403C) surface-mount package: 4.06–4.57 mm length, 3.30–3.81 mm width, 1.90–2.41 mm height, with gull-wing leads optimized for automated assembly and thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NP1500SBT3G and SM15T15A, NP1500SAT3G delivers superior surge immunity (500 A_(pk) Level 3), inherent bidirectionality, and lower clamping voltage - making it optimal for central office and high-reliability telecom infrastructure where single-device simplicity and robust fail-safe protection are mandatory.

Availability

NP1500SAT3G is available at Aetrix Electronics and suitable for DSL line cards, ISDN interfaces, central office SLIC modules, and VoIP gateway FXS ports requiring stable component supply, long-term lifecycle support, and certified surge protection performance.

Supply support for NP1500SAT3G 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, cloud, and communications markets.

NP1500SAT3G belongs to the NP Series Thyristor Surge Protector Devices - engineered specifically for telecom infrastructure protection, with design focus on GR-1089-CORE, IEC 61000-4-5, and ITU-T K.20/21 compliance in central office and access network equipment.

FAQ

What is the peak off-state voltage (V_DRM) specification for NP1500SAT3G?

The NP1500SAT3G has a peak off-state voltage (V_DRM) of 140 V, meaning it blocks up to 140 V in both polarities before switching to conduction. This value is measured at 25°C and defines the maximum steady-state line voltage the device can withstand without triggering. The NP1500SAT3G maintains this rating across its full operating temperature range of −40°C to +150°C.

Does NP1500SAT3G support bidirectional surge protection without external components?

Yes, NP1500SAT3G is inherently bidirectional due to its symmetrical thyristor structure - it protects AC-coupled telecom lines (e.g., POTS, xDSL) in both positive and negative voltage polarities using only the two main terminals (MT1 and MT2). No external diodes, resistors, or capacitors are needed to achieve full bidirectional clamping, simplifying layout and improving reliability compared to discrete TVS-based solutions.

What surge waveform does NP1500SAT3G support at its highest rating?

NP1500SAT3G supports a 500 A_(pk) non-repetitive surge current under the 10×1000 µs double-exponential decay waveform per GR-1089-CORE Level 3. This is its highest validated surge rating and corresponds to worst-case lightning-induced transients in central office environments. The device also supports 75 A_(pk) at 10×360 µs and 50 A_(pk) at 10×560 µs per TIA-968-A.

How does the 44 pF capacitance of NP1500SAT3G affect broadband line performance?

The NP1500SAT3G's typical capacitance of 44 pF at 1 MHz/2 Vdc bias introduces negligible insertion loss in voiceband (300 Hz–3.4 kHz) and broadband (up to 30 MHz) telecom signals. This low capacitance preserves signal integrity in xDSL and ISDN applications, avoiding attenuation or phase shift that could degrade bit error rate or echo cancellation performance - unlike higher-capacitance MOVs or unidirectional TVS arrays.

Is NP1500SAT3G RoHS compliant and lead-free?

Yes, NP1500SAT3G is RoHS compliant and lead-free, as confirmed by the "G" suffix in its part number and explicit statement in the datasheet. It meets EU Directive 2011/65/EU and JEDEC J-STD-609 for lead-free terminations, with soldering profiles validated per onsemi's Soldering and Mounting Techniques Reference Manual (SOLDERRM/D).