Product Overview
BY459X-1500 High-Voltage Fast Recovery Damper Diode - SOD113 Isolated Tab - CRT Horizontal Deflection
Condition
Unused NOS sourced from an electronics distributor consolidating inventory. Units are clean and pristine with no handling marks. Markings on body confirm BY459X / 1500 / PHm0009 C1. Evaluation: Visual inspection only. Function testing not performed.
Ships same business day from Idaho. Packed carefully.
No hassle resolution if there is an issue. Serving customers since 1999.
Product Overview
The NXP BY459X-1500 is a glass-passivated, double-diffused fast recovery damper diode rated at 1500V reverse voltage and 12A average rectified current. Designed specifically for horizontal deflection circuits in HDTV receivers and multi-sync monitors. The X suffix designates an isolated mounting tab (SOD113 / TO-220F package), which isolates the tab electrically from the circuit while still allowing heatsink mounting for thermal management. Manufactured under the Philips semiconductor lineage - NXP Semiconductors was spun off from Philips' semiconductor division, and the PHm0009 marking on the body reflects that heritage.
Key Features
- Reverse voltage (Vr max): 1500V
- Average rectified current (Io): 12A
- Fast recovery - reverse recovery time trr ≤ 350ns (per datasheet)
- Forward voltage drop ≤ 1.25V (per datasheet)
- Isolated mounting tab - electrically isolated from circuit, compatible with heatsink mounting
- Package: SOD113 / TO-220F (TO-220FP) - two leads
- Soft recovery characteristic
- Glass-passivated, double-diffused construction
Applications
- Horizontal deflection circuits in CRT-based HDTV receivers
- Multi-sync computer monitor repair and restoration
- Arcade monitor horizontal deflection circuit repair
- Vintage CRT television and monitor restoration
- Retro computing monitor repair
Frequently Asked Questions
Is the mounting tab electrically isolated?
Yes. The X suffix in BY459X specifically designates an isolated mounting tab. This allows direct heatsink contact without an additional insulating washer in most applications - verify against your circuit design before assembly.
What is the difference between BY459X and BY459X-1500S?
The -1500 designates 1500V reverse voltage. The S suffix variant has slightly different dynamic characteristics including reverse recovery time (trr), stored charge (Qs), and forward recovery voltage (Vfr) - check your original schematic to confirm which variant your circuit specifies.
Will this work in a modern flat-panel display?
No. This diode is designed for CRT horizontal deflection circuits. Modern LCD, LED, and OLED displays do not use horizontal deflection circuits and have no application for this component.
Is a heatsink required?
Not confirmed for every application - depends on the circuit's operating current and duty cycle. The isolated tab design supports heatsink mounting. Follow your original service documentation for thermal management guidance.
Horizontal deflection circuits don't forgive substitution - the combination of 1500V headroom, fast recovery, and an isolated tab in one package is exactly what this circuit slot was designed around. Yours to put back where it belongs.
