STMicroelectronics TLP140G

Overview

TLP140G from STMicroelectronics is a tripolar transient surge arrester designed for primary overvoltage protection on analog and ISDN telecom line cards, featuring 140 V breakover voltage (VBO), 100 A peak pulse current (IPP, 10/1000 µs), 150 mA holding current (IH), 110 pF typical capacitance, and D2PAK surface-mount package. It replaces gas tubes in MDFs, terminal equipment, and transmission systems requiring lightning immunity per CCITT K.20, VDE0433, IEC-1000-4-5 Level 4, and FCC Part 68 Type A.

For engineers reviewing the TLP140G datasheet, TLP140G pinout, TLP140G application, or TLP140G equivalent, this device is selected for telecom line-level crowbar protection where low leakage (<5 µA), stable clamping, fail-safe short-circuit behavior, and surface-mount compatibility with PowerSO-10/D2PAK footprints are critical design requirements.

Technical Context

The TLP140G implements a silicon-based tripolar crowbar structure with symmetrical bidirectional triggering between Tip–Ring, Tip–GND, and Ring–GND terminals. Its functional holding current (IH = 150 mA) ensures latching after surge initiation and reliable self-extinguishing only when line current drops below threshold.

It operates across –40°C to +85°C ambient, supports 150°C junction temperature, and maintains <5 µA leakage at 120 V reverse bias. Thermal resistance is 1.0°C/W (junction-to-case), enabling robust power dissipation in telecom line card PCB layouts with copper-filled vias or metal-backed substrates.

Key Specifications

Pinout & Package

Package: D2PAK (TO-263), thermally optimized surface-mount outline with exposed tab for GND connection and mechanical stability. Dimensions: 9.35 mm × 10.28 mm × 4.60 mm (L × W × H), 3.70 mm lead pitch, 260°C/10 s soldering tolerance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar tripolar telecom surge protection applications.

Compared with TLP140M and TLP200G, the TLP140G balances optimal clamping voltage for legacy analog/ISDN lines, proven D2PAK thermal reliability, and drop-in compatibility with existing telecom line card layouts-making it the preferred choice for cost-sensitive, high-volume MDF and CPE protection modules.

Availability

TLP140G is available at Aetrix Electronics and suitable for analog line cards, ISDN U-interface terminals, Main Distribution Frames, and DSLAM protection modules requiring stable component supply, long-lifecycle support, and traceable sourcing for telecom infrastructure OEMs.

Supply support for TLP140G 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, designing and manufacturing analog, power, and microcontroller solutions for industrial, automotive, and communications markets.

The TLPxxM/G/G-1 series belongs to ST's Application-Specific Discretes (A.S.D.) portfolio, engineered explicitly for telecom line protection with tripolar crowbar architecture, fail-safe reliability, and compliance to global surge immunity standards.

FAQ

What is the failure mode of TLP140G under repeated surge stress?

TLP140G fails in a short-circuit mode after exceeding its specified surge endurance (100 A, 10/1000 µs, ≥500 pulses). This ensures downstream circuitry remains protected even at end-of-life-unlike varistors or TVS diodes that may degrade into high-impedance states. No open-circuit risk occurs.

Can TLP140G be used for DC power line protection?

No. TLP140G is designed exclusively for telecom signal line protection (Tip/Ring/GND) and lacks specifications for DC bus voltage ratings, energy absorption in unidirectional modes, or hold-off capability under continuous DC overvoltage. Its 120 V VRM and crowbar behavior make it unsuitable for DC power rails.

How does TLP140G compare to gas discharge tubes (GDTs) in telecom applications?

TLP140G offers faster response (<100 ns vs. >100 ns for GDTs), lower capacitance (110 pF vs. 1–5 pF but with higher parasitic inductance), no electrode wear-out mechanism, and surface-mount compatibility. Unlike GDTs, it does not require follow-on current limiting and exhibits no aging-related parameter drift.

Is thermal derating required when mounting TLP140G on standard FR4 PCBs?

Yes. With Rth(j-a) ≈ 65°C/W on standard FR4, power dissipation must be limited to ≤1.5 W at 70°C ΔT. Derating is mandatory above 60°C ambient; adding copper-filled vias (16×0.7 mm) reduces Rth(j-a) to 12°C/W, enabling 5.8 W operation per ST's recommended layout.