Taiwan Semiconductor Corporation DBLS154G-T

Overview

DBLS154G-T from Taiwan Semiconductor is a 1.5A, 400V repetitive peak reverse voltage (V_RRM) standard quad bridge rectifier in DBLS package, featuring 50A peak surge current (I_FSM), 1.1V max forward voltage at 1.5A, and 2µA max reverse leakage at 25°C - deployed in AC/DC front-end stages of compact switching mode power supplies.

For engineers reviewing the DBLS154G-T datasheet, DBLS154G-T pinout, DBLS154G-T application, or DBLS154G-T equivalent, key selection criteria include V_RRM = 400V, I_F = 1.5A, thermal resistance R_θJA = 40°C/W, UL recognition E-326854, and RoHS/halogen-free compliance for cost-sensitive, space-constrained industrial and consumer power conversion designs.

Technical Context

The DBLS154G-T integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals externally accessible. Its DBLS molded plastic package supports surface-mount assembly and meets J-STD-002 solderability and JESD 201 Class 1A whisker resistance requirements.

Rated for continuous operation up to T_J = 150°C, it delivers 10.37 A²s fusing I²t rating under 8.3ms half-sine surge, with junction-to-ambient thermal resistance of 40°C/W and junction-to-lead of 15°C/W - enabling reliable conduction in thermally constrained PCB layouts without forced airflow.

Key Specifications

Pinout & Package

Package: DBLS - surface-mount, molded plastic quad bridge rectifier with 4 external terminals (AC1, AC2, +, –), UL 94V-0 rated compound, matte tin-plated leads, 0.360 g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K and MB154, the DBLS154G-T offers optimal balance of 400V rating, compact DBLS footprint, 50A surge capability, and UL E-326854 recognition - making it preferred for space-constrained, high-volume adapter and SMPS designs requiring certified reliability without over-spec'ing voltage rating.

Availability

DBLS154G-T is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, LED lighting drivers, and industrial control power supplies requiring stable component supply, long-term manufacturability, and regulatory-compliant sourcing.

Supply support for DBLS154G-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 DBLS154G-T belongs to TSC's standard bridge rectifier product line, engineered for cost-effective, high-yield AC/DC conversion in consumer and industrial power supplies where reliability, regulatory compliance, and SMT manufacturability are prioritized.

FAQ

What is the maximum junction temperature rating for DBLS154G-T?

The DBLS154G-T has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table. This allows sustained operation in enclosed or high-ambient environments such as sealed LED drivers or industrial control cabinets. Thermal design must ensure junction temperature remains below this limit using R_θJA = 40°C/W and actual power dissipation derived from I_F and V_F.

Does DBLS154G-T meet RoHS and halogen-free requirements?

Yes, the DBLS154G-T is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the official Taiwan Semiconductor datasheet Version E2103. This ensures suitability for export to EU, China, and other regulated markets, and supports green manufacturing initiatives without compromising electrical performance or reliability.

What is the marking code printed on the DBLS154G-T package?

The DBLS154G-T is marked "DBLS154G" on the top surface of the DBLS package, followed by "G" (indicating green molding compound), a date code (e.g., "YW"), and factory code (e.g., "F"). This marking aligns with Taiwan Semiconductor's standardized DBLS series labeling and enables traceability and visual identification on assembled PCBs.

Is DBLS154G-T suitable for use in medical equipment power supplies?

No - Taiwan Semiconductor explicitly states that DBLS154G-T products are not designed for medical, life-saving, or life-sustaining applications. The device lacks the extended qualification, enhanced process controls, and dedicated safety certifications required for such uses. For medical-grade power supplies, consult TSC's qualified medical portfolio or alternative certified bridge rectifiers.

What is the I²t rating for DBLS154G-T and how is it applied in circuit protection?

The DBLS154G-T has an I²t rating of 10.37 A²s for fusing under 8.3ms half-sine surge conditions. This value is used to coordinate with upstream fuses or circuit breakers - ensuring the rectifier fails before the protection device trips during transient overcurrent events, thereby preventing catastrophic failure and supporting predictable fault behavior in adapter and SMPS designs.