STMicroelectronics BYT08P-400

Overview

BYT08P-400 from STMicroelectronics is a fast recovery rectifier diode in insulated TO-220AC package, rated for 400 V repetitive peak reverse voltage, 8 A average forward current at Tc = 120°C (δ = 0.5), and 35 ns maximum reverse recovery time (trr) under specified conditions. It serves as a freewheeling diode in high-frequency switch-mode power supplies and motor control circuits where low switching losses and low noise turn-off are critical.

For engineers reviewing the BYT08P-400 datasheet, BYT08P-400 pinout, BYT08P-400 application, or BYT08P-400 equivalent, key selection criteria include verified trr ≤ 35 ns at IF = 0.5 A / IR = 1 A, VF ≤ 1.4 V at Tj = 100°C / IF = 8 A, insulated case with 2500 VRMS isolation, Rth(j-c) = 3.5 °C/W, and surge capability up to 100 A (tp = 10 ms).

Technical Context

This diode employs optimized silicon epitaxial structure and lifetime control to achieve fast, soft reverse recovery-critical for minimizing EMI and voltage overshoot in hard-switched converters. Its low Qrr (recovery charge) and controlled dIF/dt dependence (e.g., IRM = 2.2 A at dIF/dt = −32 A/µs) support stable operation in flyback and forward topologies.

The insulated TO-220AC package enables direct mounting to heatsinks without electrical isolation hardware, while its 7 pF junction capacitance at 1 MHz and VR = 0 V reduces high-frequency coupling. Thermal design relies on Rth(j-c) = 3.5 °C/W and maximum Tj = 150 °C, with conduction loss modeled as P = 1.1 × IF(AV) + 0.024 × IF²(RMS).

Key Specifications

Pinout & Package

Package: Insulated TO-220AC - Molded plastic housing with electrically isolated metal tab (K), enabling direct mechanical attachment to grounded heatsinks without dielectric pads or washers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06D, BYT08P-400 trades 200 V headroom for guaranteed 35 ns trr and built-in isolation; versus VS-8EWH06FN-M3, it offers identical trr performance in a lower-cost, smaller-footprint package but with higher thermal resistance-making it optimal for cost-sensitive, space-constrained 400 V SMPS designs.

Availability

BYT08P-400 is available at Aetrix Electronics and suitable for switch-mode power supplies, motor control circuits, UPS inverters, and industrial snubber networks requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for BYT08P-400 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

BYT08P-400 belongs to ST's high-voltage fast recovery diode product line, engineered specifically for efficiency-critical, high-frequency power conversion where low trr, soft recovery, and thermal robustness are mandatory.

FAQ

What is the maximum junction temperature and how does it affect derating?

The BYT08P-400 has a maximum operating junction temperature of 150 °C. Derating follows standard thermal rules: at Tc = 105 °C, IF(AV) drops to 8 A (δ = 0.5); above that, linear derating applies using Rth(j-c) = 3.5 °C/W. Ambient temperature limits must account for heatsink thermal resistance and airflow.

Is the insulated TO-220AC package compatible with standard TO-220 mounting hardware?

Yes-the insulated TO-220AC uses the same outline and screw hole pattern as standard TO-220AC, but features an electrically isolated metal tab. Mounting torque must stay within 0.8–1.0 N·m to avoid cracking the epoxy and compromising 2500 VRMS isolation.

How does reverse recovery charge (Qrr) vary with temperature and dIF/dt?

Qrr increases with junction temperature and decreases with higher dIF/dt. At Tj = 100 °C and IF = 8 A, Qrr ranges from ~15 nC (dIF/dt = −32 A/µs) to ~9 nC (dIF/dt = −64 A/µs), as shown in Figure 8. This inverse relationship helps stabilize switching loss across operating conditions.

Can BYT08P-400 replace BYT08PI-400 in all applications?

No-BYT08P-400 uses non-insulated TO-220AC, while BYT08PI-400 is the insulated version (2500 VRMS). Substitution is only safe if the circuit already provides external isolation (e.g., ceramic washer, isolated heatsink) and thermal resistance permits (Rth(j-c) = 2.5 °C/W vs. 3.5 °C/W).