STMicroelectronics BYT08PI-400RG

Overview

BYT08PI-400RG from STMicroelectronics is an insulated fast recovery rectifier diode designed for freewheeling and output rectification in switch-mode power supplies (SMPS), motor control circuits, and DC-DC converters. It features 400 V repetitive peak reverse voltage (VRRM), 8 A average forward current (IF(AV)) at Tc = 105°C, 35 ns maximum reverse recovery time (trr), and TO-220AC insulated package with 2500 VRMS isolation rating.

For engineers reviewing the BYT08PI-400RG datasheet, BYT08PI-400RG pinout, BYT08PI-400RG application, or BYT08PI-400RG equivalent, key selection criteria include reverse recovery performance under high dIF/dt conditions, thermal resistance (Rth(j-c) = 3.5 °C/W), junction temperature limits (Tj(max) = 150 °C), and insulation integrity for safety-critical power stage designs.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for low noise turn-off switching and minimal switching losses in high-frequency power conversion. Its fast recovery behavior is characterized by controlled minority carrier lifetime, enabling stable operation at dIF/dt up to −64 A/µs with IRM ≤ 2.8 A and Qrr ≤ 18 nC at Tj = 100°C.

The insulated TO-220AC package integrates a reinforced dielectric barrier between the mounting base and internal semiconductor die, supporting 2500 VRMS isolation without external insulators. Thermal performance is defined by Rth(j-c) = 3.5 °C/W, allowing reliable conduction loss management using P = 1.1 × IF(AV) + 0.024 × IF²(RMS).

Key Specifications

Pinout & Package

BYT08PI-400RG uses an insulated TO-220AC plastic package with creepage/clearance enhanced for 2500 VRMS isolation. The metal tab is electrically isolated from the cathode and anode terminals, enabling direct heatsink mounting without additional insulating hardware.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R04DJF and IXYS MUR840E, BYT08PI-400RG uniquely delivers 2500 VRMS reinforced insulation in a cost-optimized TO-220AC form factor while maintaining industry-leading trr consistency and thermal robustness for industrial and medical power systems.

Availability

BYT08PI-400RG is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, solar microinverters, and medical AC-DC adapters requiring stable component supply, long-term lifecycle support, and certified isolation performance.

Supply support for BYT08PI-400RG 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

BYT08PI-400RG belongs to ST's high-voltage fast recovery diode product line, engineered specifically for efficiency-critical, safety-compliant power conversion where isolation integrity and switching speed must coexist without compromise.

FAQ

What is the maximum allowable case temperature for continuous operation?

The datasheet specifies IF(AV) = 8 A at Tc = 105°C with δ = 0.5. Operation above 105°C case temperature is not rated for continuous duty; derating curves in Figure 3 show 6.5 A at Tc = 125°C. Exceeding 105°C requires thermal modeling to ensure Tj remains ≤150°C.

Does the insulated tab require torque-controlled mounting?

Yes. The recommended torque value is 0.8 N·m, with a maximum of 1.0 N·m. Over-torquing may fracture the epoxy insulation layer or deform the tab, compromising 2500 VRMS isolation integrity and thermal contact reliability.

Can BYT08PI-400RG replace BYT08P-400 in existing designs?

Yes, with mechanical verification. Both share identical electrical specs and TO-220AC footprint, but BYT08PI-400RG adds insulation. Mounting hole alignment and heatsink clearance must be confirmed, as the insulated variant has slightly larger lateral dimensions (e.g., A = 14.23–15.87 mm vs. 4.40–4.60 mm for non-insulated).

How does junction capacitance affect EMI in high-frequency converters?

At 7 pF, CJ contributes minimal displacement current during voltage transitions. In 100 kHz converters, this limits common-mode noise injection into input filters and reduces risk of false triggering in adjacent gate drivers-critical in densely packed power modules where layout parasitics dominate EMI behavior.