STMicroelectronics LCP22-150B1RL

Overview

LCP22-150B1RL from STMicroelectronics is a dual-gate crowbar-type protection IC designed for TIP/RING line protection in bipolar-supply SLICs. It delivers programmable ±120 V firing thresholds, 5 mA max gate trigger current, 50 A peak pulse current (10/1000 µs), and 150 mA min holding current. It enables UL1950/IEC60950-compliant surge suppression in central office and DSLAM line cards.

For engineers reviewing the LCP22-150B1RL datasheet, LCP22-150B1RL pinout, LCP22-150B1RL application, or LCP22-150B1RL equivalent, key selection criteria include bidirectional thyristor-based crowbar action, gate-programmable positive/negative surge thresholds, SO-8 wide package compatibility with UL60950 clearance, and compliance with GR-1089 Core, ITU-T K20/K21, and TIA-968-A standards.

Technical Context

The LCP22 implements two independent thyristor structures - one for positive surges (triggered by Gp) and one for negative surges (triggered by Gn) - enabling simultaneous protection of both TIP and RING lines against lightning and AC power faults. Each gate controls its respective thyristor's breakover voltage via external biasing to +Vbat (up to +120 V) or –Vbat (down to –120 V).

Its crowbar operation clamps surges by shorting the line to GND until current falls below temperature-dependent holding thresholds (IH– ≥ 150 mA at 25 °C). Gate decoupling capacitors (100–220 nF) are required at Gn/Gp to reduce dynamic switching voltage during fast transients, and series PTC/fuse resistors (e.g., Epcos B59173C1130A151) complete the certified protection network.

Key Specifications

Pinout & Package

The LCP22-150B1RL is housed in an SO-8 wide package (ECOPACK®, UL94 V0 rated, lead-free), with 1.27 mm pitch, 7.7–8.25 mm body width (E1), and creepage/clearance compliant with UL60950.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLICPROT-22 and TPD4S012, the LCP22-150B1RL uniquely delivers integrated dual-gate crowbar action with programmable ±120 V thresholds in a single SO-8 wide package - eliminating external polarity management and enabling direct drop-in compliance with GR-1089, ITU-T K20/K21, and TIA-968-A.

Availability

LCP22-150B1RL is available at Aetrix Electronics and suitable for central office line cards, DSLAM front-end protection, and wireless local loop base stations requiring stable component supply and long-term lifecycle support.

Supply support for LCP22-150B1RL 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, and power discrete technologies with strong IP in protection devices and analog ICs.

The LCP22 belongs to ST's Trisil™ family of high-voltage protection ICs, engineered specifically for telecom infrastructure applications demanding robust, standards-compliant, bipolar line protection in space-constrained SO-8 packages.

FAQ

What is the recommended gate decoupling capacitance for LCP22-150B1RL?

The datasheet specifies 100–220 nF for Cn and Cp (Table 7), with 220 nF as the optimized value. These capacitors must be placed as close as possible to Gn/Gp pins and the GND plane to minimize inductance and ensure fast crowbar triggering during fast-rising surges like 2/10 µs transients. Ceramic X7R types are preferred for stability and low ESR.

Can LCP22-150B1RL protect both TIP and RING simultaneously during a common-mode surge?

Yes - the LCP22 topology supports simultaneous crowbar activation on both TIP and RING lines when surge polarity matches their respective gate biases. During a common-mode surge (e.g., +120 V on both lines), Gp triggers Th2 on both lines; during differential surges, only the affected line fires. The GND pin must handle combined peak current (≤50 A total).

Does LCP22-150B1RL require external fuse resistors or PTCs?

Yes - external series resistors (Rs) such as PTCs or fuse resistors are mandatory per Figure 7 and Table 1. They limit current during sustained overvoltage (e.g., AC power cross) and enable compliance with standards like UL1459. The Epcos B59173C1130A151 PTC is explicitly validated in the datasheet for ITU-T K20/K21 testing.

Is LCP22-150B1RL compatible with lead-free reflow soldering processes?

Yes - the SO-8 wide package is ECOPACK®-compliant and rated for lead-free reflow with a peak temperature of 260 °C (10 s duration, Table 2). Thermal resistance Rth(j-a) is 150 °C/W, so board-level thermal design must ensure junction temperature stays within –55 to +125 °C under worst-case surge duty cycles.