Taiwan Semiconductor Corporation DBL155G-T

Overview

DBL155G-T from Taiwan Semiconductor is a 1.5A, 600V standard quad bridge rectifier in DBL package, featuring 50A peak surge current, 1.1V max forward voltage per diode at 1.5A, and 2µA max reverse leakage at 25°C - used in AC/DC front-end conversion for compact switching mode power supplies.

For engineers reviewing the DBL155G-T datasheet, DBL155G-T pinout, DBL155G-T application, or DBL155G-T equivalent, key selection criteria include repetitive peak reverse voltage (600V), thermal resistance (15°C/W junction-to-lead), RoHS/halogen-free compliance, and UL recognition for safety-critical board-level integration.

Technical Context

The DBL155G-T integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals externally accessible. Its DBL molded plastic package supports surface-mount assembly and meets J-STD-002 solderability and JESD 201 Class 1A whisker resistance standards.

Thermal performance is defined by R_θJL = 15°C/W and R_θJA = 40°C/W, enabling operation up to 150°C junction temperature. Electrical behavior includes 10.3 A²s fusing I²t rating and 25pF typical junction capacitance per diode at 1MHz/4V.

Key Specifications

Pinout & Package

Package: DBL - molded plastic, UL 94V-0 rated, matte tin-plated leads, 0.360g weight, polarity marked on top surface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bridge rectifier applications.

Compared with GBU6K-E3/51, DBL155G-T offers lower thermal resistance and smaller footprint; versus GBU6J, it provides identical performance with Taiwan Semiconductor's UL-recognized construction and halogen-free compliance.

Availability

DBL155G-T is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and LED driver power stages requiring stable component supply, consistent parametric performance, and regulatory-compliant sourcing.

Supply support for DBL155G-T 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power, automotive, and industrial markets since 1979.

The DBL15xG-T series targets cost-sensitive, high-volume AC/DC front-end applications where reliability, safety certification, and environmental compliance are mandatory - especially in compact, thermally constrained power supplies.

FAQ

What is the peak repetitive reverse voltage rating for DBL155G-T?

The DBL155G-T has a repetitive peak reverse voltage (V_RRM) rating of 600 V, as specified in the Absolute Maximum Ratings table. This value defines the maximum instantaneous reverse voltage each diode can block repeatedly without breakdown. It supports universal AC input ranges (e.g., 85–265 V_RMS) with adequate safety margin and is confirmed across all official Taiwan Semiconductor documentation for this exact part number.

Does DBL155G-T meet RoHS and halogen-free requirements?

Yes, DBL155G-T is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet. The "G" suffix in the part number denotes green (halogen-free) molding compound, and the device carries no restricted substances above threshold limits - critical for export compliance and environmentally regulated end equipment.

What is the forward voltage drop of DBL155G-T at rated current?

The DBL155G-T exhibits a maximum forward voltage (V_F) of 1.1 V per diode at I_F = 1.5 A and T_J = 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and directly impacts conduction losses and thermal design. At elevated junction temperatures, V_F decreases slightly, but the 1.1 V max ensures predictable power dissipation in worst-case ambient conditions.

Is DBL155G-T UL recognized, and what is its file number?

Yes, DBL155G-T is UL Recognized under File # E-326854, as documented in the FEATURES section of the official Taiwan Semiconductor datasheet. This recognition applies to the DBL154G-T through DBL157G-T family and confirms compliance with UL 60747-4 for discrete semiconductors - supporting faster end-product safety certification in North American markets.

What is the thermal resistance from junction to lead for DBL155G-T?

The junction-to-lead thermal resistance (R_θJL) of DBL155G-T is 15°C/W, as published in the THERMAL PERFORMANCE section. This parameter enables efficient heat transfer from the silicon die to the PCB copper via the leads, allowing designers to estimate temperature rise under load without external heatsinks - particularly valuable in space-constrained adapter and lighting applications.