STMicroelectronics LCP02-150B1

Overview

LCP02-150B1 from STMicroelectronics is a dual-thyristor crowbar protection IC designed for SLIC (Subscriber Line Interface Circuit) applications in telecom line cards. It provides programmable overvoltage protection on TIP and RING lines with separate negative (Gn) and positive (Gp) gate control, -110V to +95V firing range, 30A peak pulse current (10/1000µs), and UL497B approval (E136224). It is used in central office, PBX, and ADSL G.Lite systems requiring bidirectional surge suppression.

For engineers reviewing the LCP02-150B1 datasheet, LCP02-150B1 pinout, LCP02-150B1 application, or LCP02-150B1 equivalent, key selection criteria include programmable dual-polarity threshold control, SO-8 wide package thermal performance (R_th(j-a) = 150°C/W), holding current temperature derating, and compliance with ITU-T K20/K21, Bellcore GR-1089-CORE, and FCC Part 68 lightning surge standards.

Technical Context

The LCP02-150B1 implements two independent thyristor-based crowbar structures-one for negative surges (triggered via Gn at -110V to 0V), one for positive surges (triggered via Gp at 0V to +95V)-with transistor-assisted gate triggering to minimize battery current during clamping. Each path supports programmable breakover voltage via external gate biasing.

It operates across dual-battery SLIC topologies (e.g., -110V/+95V differential ≤190V), delivers 30A peak pulse current under 10/1000µs waveform, and maintains functional operation from -20°C to +85°C with defined holding current derating per Figure 2. Capacitance between LINE/GND is 60pF at -3V reverse bias.

Key Specifications

Pinout & Package

Package: SO-8 Wide (8-pin plastic surface-mount, 7.62–8.89 mm body width, 1.51–2.00 mm height, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SLIC protection applications.

Compared with SLIC02-150B1 and TPD2S701DR, the LCP02-150B1 uniquely combines UL497B certification, 30A surge handling, and programmable dual-threshold crowbar action-making it the sole option for certified telecom central office and PBX deployments requiring robust, field-proven line protection.

Availability

LCP02-150B1 is available at Aetrix Electronics and suitable for Central Office line cards, PBX systems, and ADSL G.Lite modems requiring stable component supply, long-term lifecycle support, and certified surge protection performance.

Supply support for LCP02-150B1 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, power, and smart mobility solutions with broad IP and manufacturing scale.

The LCP02 product line targets telecom infrastructure protection ICs, specifically engineered to replace discrete thyristor arrays in SLIC front-ends while delivering programmable, standards-compliant, and thermally robust crowbar functionality.

FAQ

What is the maximum allowable differential voltage between TIP and RING when using LCP02-150B1?

The LCP02-150B1 supports a maximum total battery supply voltage (∆V_bat) of 190V, defined as the absolute sum of negative and positive battery rails (e.g., -110V + +95V). This limit ensures safe operation of both internal thyristors and prevents breakdown under steady-state DC conditions, regardless of TIP–RING differential swing during normal signaling.

How does the LCP02-150B1 achieve low gate trigger current while maintaining fast response?

It uses integrated bipolar transistors to amplify gate drive current: a small IGn or IGp (≤5mA) injected into Gn or Gp biases the transistor base, which then delivers higher current to the thyristor gate. This architecture reduces required external drive strength while enabling sub-100ns turn-on delay, critical for suppressing fast-rising lightning transients before SLIC damage occurs.

Can LCP02-150B1 be used in single-supply SLIC designs?

Yes - it supports single-negative-supply configurations (e.g., -110V only) by connecting Gp to GND and leaving it inactive, while Gn is biased to -V_bat. In this mode, only the negative thyristor path operates, providing protection down to -110V with full 30A surge capability and 150mA holding current, as verified in Bellcore GR-1089-CORE intrabuilding tests.

What is the recommended value and placement for external capacitors Cn and Cp?

STMicroelectronics specifies 220nF ceramic capacitors placed as close as possible to Gn and Gp pins and their respective ground reference tracks. This minimizes parasitic inductance and ensures rapid gate charging during fast transients (e.g., 1.2/50µs surges), reducing dynamic breakover voltage at TIP/RING by up to 40% compared to layouts without these capacitors.