STMicroelectronics THBT15011DRL

Overview

THBT15011DRL from STMicroelectronics is a bidirectional trisil overvoltage protector for telecom line interfaces, providing triple-mode crowbar protection between tip–ground, ring–ground, and tip–ring. It features 150 V breakdown voltage (VBO), 30 A peak pulse current (10/1000 µs), 150 mA holding current (IH), and SO-8 package with 4-point ground configuration for low-inductance surge conduction-used in line card surge protection per Telcordia GR-1089-Core Level 2.

For engineers reviewing the THBT15011DRL datasheet, THBT15011DRL pinout, THBT15011DRL application, or THBT15011DRL equivalent, key selection criteria include longitudinal/transversal mode symmetry, dynamic VBO under 2/10 µs 2.5 kV stress, leakage current ≤5 µA at 135 V, and compatibility with SLIC interface ratings in POTS and VoIP terminal equipment.

Technical Context

This device implements a monolithic tripolar thyristor structure enabling simultaneous bidirectional clamping across three differential pairs without external components. Its "4-point" ground layout (pins 2,3,6,7) minimizes L·di/dt-induced overshoot during fast transients like 2/10 µs surges.

Static parameters are characterized at 25 °C with guaranteed VBO min = 150 V and max IRM = 5 µA at VRM = 135 V; dynamic VBO remains ≤190 V under 2/10 µs 2.5 kV surge with 62 Ω line protection resistor-meeting first-level Telcordia immunity requirements when used with series resistors.

Key Specifications

Pinout & Package

THBT15011DRL uses an SO-8 plastic package (ECOPACK®, lead-free, UL94 V0 compliant) with 1.27 mm pitch and 4.9 mm × 6.0 mm body dimensions. Pin assignment enables symmetric tip/ring routing and distributed grounding to suppress parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THBT15011DRL, PESD5V0S1BA lacks bidirectional crowbar action and holding capability needed for -48 V systems, while SP1003-01FTG introduces excessive capacitance and slower reset-making THBT15011DRL uniquely suited for SLIC-coupled analog telephony protection requiring matched longitudinal/transversal clamping and controlled latch-hold behavior.

Availability

THBT15011DRL is available at Aetrix Electronics and suitable for telecom line cards, VoIP terminal equipment, payphone ground-key circuits, and POTS telephone set protection requiring stable component supply and long-term lifecycle support.

Supply support for THBT15011DRL 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, MCU, and protection devices for industrial, automotive, and communications markets.

THBT15011DRL belongs to ST's Trisil™ overvoltage protection product line, engineered specifically for robust, low-inductance crowbar action in analog telephony infrastructure-addressing Telcordia-compliant surge immunity with monolithic integration and 4-point grounding.

FAQ

What is the function of the four ground pins (2,3,6,7) in THBT15011DRL?

The four ground pins implement a "4-point" bonding architecture that distributes surge current across multiple parallel low-inductance paths. This reduces total package inductance by minimizing bond-wire loop area, ensuring sub-10 ns response to fast transients like 2/10 µs surges and suppressing L·di/dt overshoot during clamping-critical for meeting Telcordia GR-1089 first-level immunity.

Can THBT15011DRL be used without external series resistors in Telcordia-compliant designs?

No. Per Telcordia GR-1089-Core Section 4.3.2, THBT15011DRL requires line-series resistors (e.g., 10 Ω or 62 Ω depending on surge level) to limit follow current and ensure safe operation during 1000 V (10/1000 µs) and 2500 V (2/10 µs) tests. The device's 150 mA holding current necessitates external impedance to guarantee automatic reset after surge clearance.

How does THBT15011DRL differ from standard bidirectional TVS diodes in telecom protection?

Unlike TVS diodes-which clamp then recover passively-THBT15011DRL is a thyristor-based crowbar that latches into low-impedance conduction until line voltage falls below its holding threshold (~48 V). This provides superior energy handling for sustained overvoltages and eliminates leakage-related power loss during normal operation, making it ideal for -48 V battery-fed telecom interfaces.

Is THBT15011DRL compatible with lead-free reflow soldering processes?

Yes. THBT15011DRL is supplied in an ECOPACK®-compliant SO-8 package with lead-free second-level interconnects, qualified for standard Pb-free reflow profiles up to 260 °C peak temperature for 10 seconds. The epoxy mold compound meets UL94 V0 flammability rating and complies with JEDEC JESD97 marking standards.