NXP Semiconductors BYC5D-500,127

Overview

BYC5D-500 from NXP Semiconductors is a hyperfast power diode in SOD59 (TO-220AC) package, designed for high-frequency switching in PFC and bridge rectifier stages. It delivers 5 A average forward current, 500 V repetitive peak reverse voltage, 16 ns reverse recovery time at 5 A/400 V, and 1.15–1.45 V forward voltage at 5 A and 150 °C - enabling low-loss operation in CCM PFC circuits.

For engineers reviewing the BYC5D-500 datasheet, BYC5D-500 pinout, BYC5D-500 application, or BYC5D-500 equivalent, key selection criteria include verified trr ≤16 ns at rated conditions, thermal resistance Rth(j-mb) = 2.5 K/W, cathode-connected mounting base, and compatibility with TO-220AC heatsink mounting in high-efficiency SMPS designs.

Technical Context

The BYC5D-500 employs optimized silicon process and junction design to achieve hyperfast soft recovery, minimizing reverse recovery current (IRM ≤11 A) and associated switching losses in synchronous and hard-switched topologies. Its low Qrr and controlled dV/dt behavior reduce EMI generation during turn-off.

Thermally, the device uses a direct-junction-to-mounting-base path with Rth(j-mb) = 2.5 K/W, enabling efficient heat transfer to external heatsinks. The cathode is internally bonded to the metal mounting base, eliminating need for insulating washers in standard TO-220AC installations.

Key Specifications

Pinout & Package

SOD59 (TO-220AC) plastic single-ended package with heatsink-mounted metal base; 2 leads; 1 mounting hole; cathode connected to mounting base.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hyperfast diode applications.

Compared with STTH5L06 and ISL9R5060P2, the BYC5D-500 uniquely combines 500 V rating, 16 ns t_rr, and cathode-integrated mounting base - delivering optimal trade-off of speed, thermal performance, and mechanical simplicity in cost-sensitive CCM PFC designs.

Availability

BYC5D-500 is available at Aetrix Electronics and suitable for Continuous Current Mode (CCM) Power Factor Correction, half-bridge switched-mode power supplies, and industrial lighting ballasts requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for BYC5D-500 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in high-performance analog, logic, and power devices for industrial, automotive, and consumer applications.

The BYC5D-500 belongs to NXP's Hyperfast Diode product line, engineered specifically for high-efficiency, high-frequency switching power conversion - with emphasis on reduced recovery loss, thermal robustness, and ease of heatsink integration in compact SMPS designs.

FAQ

What is the maximum junction temperature rating for the BYC5D-500?

The BYC5D-500 has a maximum junction temperature (T_j) rating of 150 °C, as specified in its Absolute Maximum Ratings table. This allows reliable operation in thermally demanding environments such as enclosed power supplies or high-ambient industrial settings, provided the mounting base temperature remains ≤129 °C per the I_F(AV) derating curve. The BYC5D-500 must not be operated beyond this limit to avoid permanent degradation.

Is the mounting base of the BYC5D-500 electrically isolated?

No, the mounting base of the BYC5D-500 is electrically connected to the cathode (Pin 1), as confirmed in the pinning information and package outline. This internal bond eliminates the need for insulating hardware in standard TO-220AC heatsink mounting, but requires circuit-level isolation of the heatsink if the cathode node is not at chassis ground potential. The BYC5D-500's design intentionally leverages this connection for optimal thermal performance.

What is the reverse recovery time (t_rr) of the BYC5D-500 under typical operating conditions?

The BYC5D-500 exhibits a reverse recovery time of 16 ns under the defined test condition: I_F = 5 A, V_R = 400 V, dI_F/dt = 500 A/µs, and T_j = 25 °C. This value is confirmed in Table 1 (Quick Reference Data) and Table 6 (Characteristics). At higher temperatures or lower dI_F/dt, t_rr may increase slightly, but the BYC5D-500 maintains hyperfast performance across its rated operating range.

Can the BYC5D-500 replace standard ultrafast diodes in existing PFC designs?

Yes, the BYC5D-500 can directly replace many ultrafast diodes in CCM PFC designs due to its identical TO-220AC (SOD59) footprint, same pinout (anode/cathode), and superior t_rr (16 ns vs. typical 30–50 ns). Its lower V_F at high temperature and cathode-integrated base also improve thermal and electrical performance. However, verify layout clearance for mounting base voltage and confirm that 500 V V_RRM meets system requirements before substituting into existing BYC5D-500 designs.

What is the thermal resistance from junction to mounting base (R_th(j-mb)) for the BYC5D-500?

The thermal resistance from junction to mounting base (R_th(j-mb)) for the BYC5D-500 is 2.5 K/W, as specified in Table 5 (Thermal Characteristics). This value is measured under standard test conditions and reflects the device's highly efficient thermal path from die to heatsink via the cathode-connected metal base. When used with a properly torqued heatsink and thermal interface material, the BYC5D-500 achieves predictable junction temperature rise - a key advantage over alternatives with higher R_th(j-mb).