Taiwan Semiconductor Corporation RTBS40M

Overview

RTBS40M from Taiwan Semiconductor is a 4A, 1000V fast recovery quad bridge rectifier in TBS package, featuring 300 ns reverse recovery time, 1.10 V forward voltage at 4A/25°C, and 110 A surge current rating. It serves as the AC–DC input stage in compact high-efficiency SMPS for LED drivers and industrial adapters.

For engineers reviewing the RTBS40M datasheet, RTBS40M pinout, RTBS40M application, or RTBS40M equivalent, key selection criteria include repetitive peak reverse voltage (1000 V), thermal resistance (R_θJL = 17 °C/W), junction temperature range (−55 to +150 °C), and UL recognition (E-326854).

Technical Context

The RTBS40M integrates four fast recovery diodes in a single monolithic bridge configuration with glass-passivated junctions, enabling stable operation under high dv/dt and repetitive surge conditions. Its 300 ns trr and low Qrr support high-frequency switching up to 100 kHz in flyback and forward converters.

Thermal performance is optimized for PCB-mounted operation: R_θJL = 17 °C/W and R_θJC = 15 °C/W measured on a 16 mm × 16 mm Cu pad, allowing 4 A continuous conduction without forced air cooling at ambient ≤ 65 °C.

Key Specifications

Pinout & Package

Package: TBS - Surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity marked on top surface. Dimensions per Taiwan Semiconductor package outline drawing (Rev. B2103).

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K, RTBS40M offers superior thermal performance and smaller footprint; compared with GBJ4M, it delivers faster recovery and lower conduction loss-making it optimal for high-density, high-efficiency SMPS where thermal headroom and EMI control are critical.

Availability

RTBS40M is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and industrial AC/DC adapters requiring stable component supply, UL-compliant construction, and extended temperature operation.

Supply support for RTBS40M 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.

The RTBS40M belongs to TSC's TBS-series fast recovery bridge rectifiers, engineered specifically for high-efficiency, space-constrained AC–DC conversion in LED lighting, adapters, and industrial power supplies.

FAQ

What is the maximum junction temperature rating for the RTBS40M?

The RTBS40M has a maximum junction temperature (T_JMAX) of +150 °C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet (Rev. B2103). This allows reliable operation in enclosed LED driver housings and industrial enclosures where ambient temperatures reach 85 °C, provided thermal design maintains junction temperature below this limit. The RTBS40M's R_θJL = 17 °C/W supports this capability when mounted on a 16 mm × 16 mm copper pad.

Does the RTBS40M have UL recognition, and what is the file number?

Yes, the RTBS40M is UL Recognized under file number E-326854, as confirmed in the "Features" section of the official Taiwan Semiconductor datasheet. This certification covers flammability (UL 94V-0), electrical insulation, and long-term reliability testing-enabling direct use in end products seeking UL/CSA safety approval without additional component-level qualification. The RTBS40M's UL recognition applies to the full TBS package configuration shipped in tape-and-reel format.

What is the reverse recovery time (t_rr) of the RTBS40M, and under what test conditions is it specified?

The RTBS40M has a reverse recovery time (t_rr) of 300 ns maximum, measured under the condition: I_F = 0.5 A, I_R = 1.0 A, I_RR = 0.25 A, as stated in the Electrical Specifications table. This parameter is critical for minimizing switching losses and EMI in high-frequency SMPS designs. The RTBS40M's 300 ns t_rr enables stable operation up to 100 kHz in flyback converters, outperforming standard recovery bridges that typically exceed 500 ns.

Is the RTBS40M compliant with RoHS and halogen-free standards?

Yes, the RTBS40M is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the Features section of the Taiwan Semiconductor datasheet. All materials-including molding compound, lead frame, and plating-meet these environmental requirements. This compliance ensures the RTBS40M is suitable for export to EU, Japan, and other regulated markets, and supports customer sustainability reporting. The RTBS40M's halogen-free status is verified through material declarations and third-party lab testing.

What is the marking code printed on the RTBS40M device body?

The marking code on the RTBS40M device body is "RT40M", as specified in the Absolute Maximum Ratings table under "Marking code on the device". This 4-character laser-marked identifier appears adjacent to the date code (YW) and factory code (F) on the top surface of the TBS package. The RTBS40M's marking conforms to JEDEC standards and is legible under 20× magnification for automated optical inspection (AOI) during SMT assembly.