STMicroelectronics THBT27011DRL

Overview

THBT27011DRL from STMicroelectronics is a bidirectional trisil overvoltage protector for telecom line interfaces, providing triple-mode crowbar protection between TIP–GND, RING–GND, and TIP–RING. It features 270 V standoff voltage, 380 V minimum breakdown voltage, 30 A peak pulse current (10/1000 µs), 150 mA holding current, and SO-8 package with 4-point ground configuration for low-inductance surge conduction in telephone line cards.

For engineers reviewing the THBT27011DRL datasheet, THBT27011DRL pinout, THBT27011DRL application, or THBT27011DRL equivalent, key selection criteria include longitudinal/transversal mode symmetry, dynamic VBO under 2/10 µs (400 V), compliance with Telcordia GR-1089-Core Level 1 & 2 surges, and SO-8 thermal resistance (Rth(j-a) = 170 °C/W).

Technical Context

This device implements a monolithic triple bidirectional thyristor structure enabling simultaneous crowbar action across all three telecom line pairs. Its "4-point" internal bonding minimizes parasitic inductance-critical for clamping fast transients like 2/10 µs (5000 V) surges without L·di/dt overshoot.

Dynamic breakover voltage is specified per test circuit 3 with defined line protection resistors (Rp = 62 Ω for 2/10 µs), ensuring predictable turn-on under Telcordia-compliant stress conditions. Static parameters guarantee VBR ≥ 380 V and VRM = 240 V, supporting SLIC interface compatibility and long-term reliability in -40°C to +150°C ambient.

Key Specifications

Pinout & Package

THBT27011DRL is housed in an SO-8 plastic package compliant with JEDEC MS-012, UL94 V0 epoxy, and ECOPACK® lead-free interconnect standards. Dimensions: 4.90 mm × 6.00 mm × 1.75 mm (typ.), 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THBT20011DRL and PGB1020303MR, THBT27011DRL uniquely supports 240 V steady-state operation and 400 V dynamic clamping in all three protection modes-enabling robust, self-sustaining crowbar action for full Telcordia GR-1089-Core Level 1 compliance in 48 V telecom systems.

Availability

THBT27011DRL is available at Aetrix Electronics and suitable for central office line cards, DSLAM protection modules, VoIP gateway interfaces, and payphone line interfaces requiring stable component supply and long-term lifecycle support.

Supply support for THBT27011DRL 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, digital, and mixed-signal ICs for automotive, industrial, and communications markets.

THBT27011DRL belongs to ST's Trisil™ overvoltage protection product line, engineered specifically for robust, low-inductance crowbar protection in telecom infrastructure where SLIC interface survivability and Telcordia compliance are mandatory.

FAQ

What is the maximum continuous operating voltage for THBT27011DRL?

The THBT27011DRL has a stand-off voltage (VRM) of 240 V, meaning it can continuously block up to 240 V DC or RMS AC across any protected pair (TIP–GND, RING–GND, or TIP–RING) while maintaining leakage current ≤5 µA. This rating is validated per Table 4 in the official ST datasheet Rev 8 (Feb 2008).

Does THBT27011DRL require external current limiting resistors?

No-THBT27011DRL is a latching crowbar device with 150 mA holding current (IH), so it remains conductive after triggering until line current falls below that threshold. Unlike TVS diodes, it does not require series resistors for energy limitation during sustained overvoltages such as AC power cross events.

How does the "4-point" ground configuration improve surge performance?

The four dedicated GND pins (pins 2, 3, 6, 7) minimize total loop inductance in the surge current path, directly suppressing L·di/dt voltage overshoot during fast transients (e.g., 2/10 µs). This ensures the device triggers at its rated dynamic VBO (400 V) without parasitic ringing, as confirmed in Figure 8 and Application Note section 2.1.

Is THBT27011DRL compatible with lead-free reflow soldering processes?

Yes-THBT27011DRL uses an ECOPACK® SO-8 package with lead-free second-level interconnect, qualified for standard Pb-free reflow profiles. The maximum lead temperature is rated at 260 °C for 10 seconds, matching IPC/JEDEC J-STD-020D requirements for SnAgCu soldering.