Taiwan Semiconductor Corporation DBLS104G-T

Overview

DBLS104G-T from Taiwan Semiconductor is a 1 A, 400 V repetitive peak reverse voltage (V_RRM) standard quad bridge rectifier in DBLS package, featuring 40 A peak forward surge current (I_FSM), 15 °C/W junction-to-lead thermal resistance, and UL Recognized (E-326854) construction - used in AC/DC front-end rectification for compact SMPS.

For engineers reviewing the DBLS104G-T datasheet, DBLS104G-T pinout, DBLS104G-T application, or DBLS104G-T equivalent, key selection criteria include verified 400 V V_RRM, 1 A average forward current rating, 1.1 V max forward voltage at 1 A, moisture sensitivity level 1 compliance, and DBLS surface-mount package compatibility with automated PCB assembly.

Technical Context

The DBLS104G-T integrates four silicon diodes in a single-phase full-wave bridge configuration, enabling AC-to-DC conversion without external interconnection. Its DBLS molded plastic package supports reflow soldering per J-STD-002, with matte tin-plated leads and UL 94V-0 flammability rating.

Thermally, it delivers R_θJL = 15 °C/W and R_θJA = 40 °C/W, allowing sustained 1 A conduction at up to 150 °C junction temperature. Reverse leakage remains ≤2 µA at 25 °C and ≤100 µA at 125 °C under rated V_R.

Key Specifications

Pinout & Package

Package: DBLS - surface-mount, 4-terminal molded plastic case with gull-wing leads, UL 94V-0 rated, 0.360 g typical 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 GBU4K and MB10F, the DBLS104G-T uniquely balances 40 A surge capability, DBLS surface-mount form factor, and UL recognition - making it optimal for next-generation compact, certified, and high-reliability AC/DC converters.

Availability

DBLS104G-T is available at Aetrix Electronics and suitable for switching mode power supplies, USB wall adapters, and LED lighting applications requiring stable component supply, RoHS/halogen-free compliance, and UL-recognized reliability.

Supply support for DBLS104G-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, protection, and signal conditioning markets since 1979.

The DBLS series was developed specifically for high-density, surface-mount AC/DC front-end rectification in space-constrained consumer and industrial power supplies - emphasizing thermal efficiency, regulatory compliance, and automated assembly readiness.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for DBLS104G-T?

The DBLS104G-T has a specified V_RRM of 400 V, meaning it can reliably block up to 400 V of reverse voltage across its terminals in repetitive operation. This rating is confirmed in the Absolute Maximum Ratings table and distinguishes DBLS104G-T from higher-voltage variants like DBLS105G-T (600 V) and DBLS107G-T (1000 V). Designers must ensure system peak reverse voltage stays below this limit with appropriate derating margin.

Does DBLS104G-T support lead-free reflow soldering?

Yes, DBLS104G-T supports lead-free reflow soldering per J-STD-002. Its matte tin-plated leads are qualified for standard Pb-free thermal profiles, and its DBLS package is rated for moisture sensitivity level 1 - eliminating the need for pre-baking. The device also complies with RoHS and halogen-free standards (IEC 61249-2-21), confirming full process compatibility with modern eco-compliant manufacturing lines.

What is the forward voltage drop (V_F) specification for DBLS104G-T at rated current?

The DBLS104G-T specifies a maximum forward voltage of 1.1 V at I_F = 1 A and T_J = 25 °C, measured per diode under pulsed conditions (PW = 0.3 ms). This value directly impacts conduction losses and thermal performance in continuous operation. At elevated junction temperatures, V_F decreases slightly, but system-level thermal design must account for worst-case 1.1 V to ensure adequate margin for efficiency and temperature rise calculations.

Is DBLS104G-T UL Recognized, and what is its file number?

Yes, DBLS104G-T is UL Recognized under file number E-326854. This certification applies to the DBLS104G-T variant specifically and confirms compliance with UL 60747-4 for semiconductor devices. It validates the molded plastic package's flammability (UL 94V-0), electrical insulation, and long-term reliability - supporting faster end-product safety approvals for power supplies and adapters sold in North America.

How does the thermal performance of DBLS104G-T compare to standard KBP bridge rectifiers?

DBLS104G-T offers R_θJL = 15 °C/W and R_θJA = 40 °C/W, significantly better than typical KBP packages (R_θJA ≈ 50–60 °C/W). Its DBLS gull-wing leads provide superior thermal conduction to PCB copper, enabling higher power density without heatsinks. In practice, this allows DBLS104G-T to sustain 1 A at 75 °C ambient where a KBP404 would require derating - critical for slim-profile adapters and enclosed lighting drivers.