NXP Semiconductors BY229X-800,127

Overview

BY229X-800,127 from NXP Semiconductors (formerly Philips) is a fast, soft-recovery glass-passivated rectifier diode in SOD113 package, rated for 800 V peak repetitive reverse voltage (VRRM), 8 A average forward current (IF(AV)), and 135 ns maximum reverse recovery time (trr). It delivers low forward voltage drop (1.85 V at 20 A), high thermal cycling performance, and isolated mounting tab - designed for primary-side rectification in switched-mode power supplies.

For engineers reviewing the BY229X-800,127 datasheet, BY229X-800,127 pinout, BY229X-800,127 application, or BY229X-800,127 equivalent, key selection criteria include VRRM rating, soft-recovery behavior for EMI reduction, thermal resistance junction-to-heatsink (4.8 K/W with compound), isolation voltage (2500 V RMS), and SOD113 mechanical compatibility with heatsink mounting.

Technical Context

This diode uses double-diffused, glass-passivated construction to achieve fast switching with soft reverse recovery - minimizing voltage overshoot and ringing during turn-off. Its isolated mounting tab enables direct heatsink attachment without insulating washers while maintaining 2500 V RMS isolation between terminals and heatsink.

The device operates up to 150 °C junction temperature and supports sinusoidal or square-wave forward current waveforms. Key dynamic parameters - trr ≤ 135 ns, Qs ≤ 0.7 µC, and dIR/dt ≥ 50 A/µs - are specified at Tj = 25 °C with defined test conditions (e.g., -dIF/dt = 50 A/µs for trr).

Key Specifications

Pinout & Package

SOD113 package: axial-leaded, epoxy-encapsulated, electrically isolated seating plane; net mass 2 g; UL94 V0 compliant; dimensions per Fig.11 (15.8 mm max length, 10.3 mm max height, 3.2 mm lead spacing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06D and VS-8EWH06FNTR-M3, the BY229X-800,127 uniquely combines 800 V blocking, soft recovery, and integrated 2500 V RMS heatsink isolation - making it irreplaceable in universal-input, chassis-mounted, high-reliability SMPS where voltage margin and EMI control are critical.

Availability

BY229X-800,127 is available at Aetrix Electronics and suitable for TV receivers, monitor power supplies, and industrial switched-mode power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for BY229X-800,127 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering analog and power portfolio.

The BY229X series belongs to NXP's legacy high-voltage rectifier product line, engineered specifically for robust, low-EMI AC/DC conversion in consumer and industrial power electronics where reliability under thermal and electrical stress is essential.

FAQ

What is the maximum junction temperature rating for BY229X-800,127?

The BY229X-800,127 has a maximum operating junction temperature (Tj) of 150 °C, as specified in the Absolute Maximum Ratings table. This rating enables reliable operation in high-ambient environments such as enclosed power supplies or industrial enclosures, provided thermal design maintains junction temperature below this limit using the specified Rth j-hs of 4.8 K/W with heatsink compound.

Does BY229X-800,127 have an electrically isolated mounting tab?

Yes, the BY229X-800,127 features an electrically isolated mounting tab, confirmed in the Isolation Limiting Value section: 2500 V RMS isolation voltage from both terminals to external heatsink. This allows direct mechanical attachment to grounded heatsinks without additional insulation, reducing thermal resistance and assembly complexity compared to insulated-mount alternatives.

What is the reverse recovery time (trr) specification for BY229X-800,127?

The BY229X-800,127 has a maximum reverse recovery time (trr) of 135 ns, measured at IF = 1 A, VR > 30 V, and -dIF/dt = 50 A/µs at Tj = 25 °C. This value reflects its fast, soft-recovery behavior - critical for minimizing switching losses and EMI in high-frequency SMPS designs operating above 50 kHz.

Can BY229X-800,127 be used in place of BY229F-800?

No - BY229X-800,127 and BY229F-800 differ in package and thermal performance: BY229X uses SOD113 with isolated tab and 4.8 K/W Rth j-hs (with compound), while BY229F uses SOD100 without isolation and higher Rth j-hs. Mechanical fit, heatsink interface, and isolation requirements are not interchangeable; substitution requires full thermal and safety revalidation.

What is the forward voltage drop of BY229X-800,127 at rated current?

The BY229X-800,127 exhibits a maximum forward voltage drop (VF) of 1.85 V at IF = 20 A and Tj = 25 °C. At its rated average forward current of 8 A, typical VF is ~1.5 V - a key parameter for calculating conduction losses and thermal design in high-efficiency power supplies.