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NXP Semiconductors BY459X-1500S,127
- Part No.:
- BY459X-1500S,127
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
BY459X-1500S,127.pdf
- Description:
- DIODE GEN PURP 1.5KV 10A TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:7,109
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Product details
Overview
BY459X-1500S,127 from NXP Semiconductors (formerly Philips) is a fast, high-voltage damper diode in SOD113 package with 1500 V peak repetitive reverse voltage (VRRM), ≤1.35 V forward voltage at 6.5 A and 25 °C, and ≤220 ns reverse recovery time (trr). It serves as horizontal deflection damper in CRT-based HDTV receivers and multi-sync monitors.
For engineers reviewing the BY459X-1500S,127 datasheet, BY459X-1500S,127 pinout, BY459X-1500S,127 application, or BY459X-1500S,127 equivalent, key selection criteria include isolated mounting tab capability, soft recovery characteristic for reduced EMI in flyback circuits, thermal resistance junction-to-heatsink of 4.8 K/W (with compound), and RMS forward current rating of 30 A.
Technical Context
This damper diode employs glass-passivated double-diffused construction to achieve fast switching and soft reverse recovery-critical for minimizing voltage overshoot and ringing in horizontal deflection flyback transformers. Its isolated mounting tab enables direct heatsink attachment without electrical isolation hardware.
The device operates with peak forward current up to 12 A at 48 kHz and 10 A at 82 kHz line frequencies, supporting high-frequency CRT scanning. Reverse recovery charge (Qs) is rated ≤0.95 µC at 2 A and −dIF/dt = 20 A/µs, confirming low stored charge for efficient energy recycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1500 V - supports operation in high-voltage horizontal deflection circuits with margin against transient spikes |
| VF @ 6.5 A, 25 °C | ≤1.35 V - reduces conduction loss and thermal stress during peak current pulses |
| trr | ≤220 ns - enables clean turn-off with minimal tail current, suppressing EMI in flyback timing |
| IF(RMS) | 30 A - sustains continuous power dissipation in thermally demanding deflection stages |
| Rth j-hs | 4.8 K/W (with compound) - allows effective heatsinking to maintain Tj ≤ 150 °C under pulsed load |
| Visol | 2500 V RMS - provides reinforced isolation between terminals and heatsink for safety-critical CRT chassis grounding |
| Qs | ≤0.95 µC - limits stored charge to reduce switching loss and voltage overshoot during commutation |
Pinout & Package
SOD113 is a plastic single-ended TO-220–derived package with electrically isolated mounting tab, 2 leads, and 2 g net mass. The tab is internally isolated from both terminals per Fig.8 and mechanical notes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to horizontal output transistor collector and flyback transformer primary return; carries peak reverse voltage |
| 2 | Anode | Connected to B+ supply rail; conducts forward current during flyback energy transfer |
| Tab | Isolated heatsink interface | Electrically isolated per IEC 60747-5-1; enables direct mechanical mounting to grounded heatsink without insulator |
Key Features
| Feature | Design Value |
|---|---|
| Soft recovery characteristic | Low dV/dt-induced snap-off; minimizes EMI generation and snubber stress in horizontal deflection circuits |
| Glass-passivated junction | Enhances reliability under thermal cycling and humidity exposure typical in consumer display environments |
| Isolated mounting tab | Eliminates need for mica washers or silicone pads-reducing assembly cost and thermal interface resistance |
| High thermal cycling performance | Validated for repeated power-on/power-off cycles in CRT displays without parameter drift or bond wire failure |
Applications
| HDTV Horizontal Deflection | Multi-Sync Monitor Flyback |
|---|---|
Use Scenario: High-voltage flyback circuit in 100 Hz+ HDTV receivers requiring stable damper action across varying line frequencies. IC Role / Device Role / Timing Role: Damper diode clamping flyback transformer secondary voltage spike and recycling stored inductive energy. Use Value: ≤220 ns trr and soft recovery suppress ringing, enabling compact snubber design and reducing EMI filter burden. | Use Scenario: Horizontal deflection stage in multi-scan computer monitors operating at 31–120 kHz line frequencies. IC Role / Device Role / Timing Role: Fast-recovery damper conducting reverse recovery current during flyback period to limit voltage overshoot. Use Value: 12 A peak current at 48 kHz and 10 A at 82 kHz support wide frequency range without derating. |
| Industrial CRT Test Equipment | Legacy Broadcast Video Monitors |
Use Scenario: High-reliability deflection circuits in factory calibration and signal integrity test systems. IC Role / Device Role / Timing Role: Isolated-tab damper diode mounted directly to chassis-grounded heatsink for thermal stability. Use Value: 2500 V RMS isolation voltage ensures safety compliance and eliminates creepage/clearance concerns on PCB. | Use Scenario: Broadcast-grade video monitors used in studio control rooms with strict EMI and thermal requirements. IC Role / Device Role / Timing Role: High-voltage damper managing flyback energy in high-brightness CRT drive circuits. Use Value: ≤1.35 V VF at 6.5 A lowers conduction loss, extending thermal margin during extended duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar damper diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH12R06DJF | 600 V VRRM, 12 A IF(RMS), TO-220AC package, non-isolated tab | Lower voltage rating; requires external isolation hardware for CRT chassis mounting | Use only where system VRRM ≤ 600 V and heatsink isolation can be implemented externally |
| VS-12EWH06-M3 | 600 V VRRM, 12 A IF(RMS), TO-247AC package, isolated tab, 175 ns trr | Half the voltage rating; superior softness but insufficient for 1500 V flyback clamp | Select only for lower-voltage deflection designs; not suitable as drop-in replacement for BY459X-1500S,127 |
Compared with STTH12R06DJF and VS-12EWH06-M3, the BY459X-1500S,127 uniquely combines 1500 V VRRM, isolated tab, and soft recovery in SOD113-enabling direct replacement in legacy CRT horizontal deflection without layout or isolation redesign.
Availability
BY459X-1500S,127 is available at Aetrix Electronics and suitable for HDTV receiver manufacturing, multi-sync monitor production, and industrial CRT test equipment requiring stable component supply and long-lifecycle support.
Supply support for BY459X-1500S,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 company formed from the spin-off of Philips' semiconductor division, specializing in high-reliability analog and power devices for automotive, industrial, and consumer applications.
The BY459X series was developed by Philips specifically for horizontal deflection damper applications in CRT-based television and monitor systems, emphasizing high-voltage ruggedness, thermal cycling endurance, and EMI-controlled soft recovery.
FAQ
What is the maximum junction temperature rating for BY459X-1500S,127?
The BY459X-1500S,127 has a maximum operating junction temperature (Tj) of 150 °C, validated under pulsed conditions with heatsink mounting. This rating enables reliable operation in high-power horizontal deflection circuits where transient thermal loads exceed steady-state limits. Derating is required above ambient temperatures of 70 °C when operating near IF(RMS) = 30 A.
Does BY459X-1500S,127 have an electrically isolated mounting tab?
Yes, the BY459X-1500S,127 features an electrically isolated mounting tab per its SOD113 mechanical specification and isolation limiting values. The tab is isolated from both terminals with 2500 V RMS withstand capability, allowing direct mounting to a grounded heatsink without additional insulation hardware-reducing thermal resistance and assembly complexity.
What is the reverse recovery time (trr) specification for BY459X-1500S,127?
The BY459X-1500S,127 has a maximum reverse recovery time (trr) of 220 ns under test conditions of IF = 1 A, VR ≥ 30 V, and Tj = 25 °C. This value reflects its soft recovery behavior, critical for minimizing voltage overshoot and EMI in CRT horizontal deflection flyback circuits where rapid current reversal occurs.
Can BY459X-1500S,127 replace BY459X-1500 in existing designs?
Yes, BY459X-1500S,127 is a direct functional replacement for BY459X-1500, sharing identical VRRM (1500 V), package (SOD113), and pinout. The "S" suffix denotes improved soft recovery and lower trr (220 ns vs. 350 ns), making it preferable for noise-sensitive applications-but no PCB or schematic changes are needed for substitution.
What is the RMS forward current rating of BY459X-1500S,127?
The BY459X-1500S,127 is rated for 30 A RMS forward current under specified thermal conditions. This rating assumes proper heatsinking with thermal resistance junction-to-heatsink ≤4.8 K/W using heatsink compound. Exceeding this value without adequate cooling risks junction temperature exceeding 150 °C and premature failure.
BY459X-1500S,127 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1500 V
- Current - Average Rectified (Io):
- 10A
- Voltage - Forward (Vf) (Max) @ If:
- 1.35 V @ 6.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 220 ns
- Current - Reverse Leakage @ Vr:
- 250 µA @ 1300 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
- Operating Temperature - Junction:
- 150°C (Max)
BY459X-1500S,127 FAQ
1.How can I place an order for BY459X-1500S,127 through Aetrix?
Please submit a Request for Quotation (RFQ) for BY459X-1500S,127 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BY459X-1500S,127 reliable?
The price and inventory of BY459X-1500S,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BY459X-1500S,127 is usually 5 days.
3.What payment methods are accepted for BY459X-1500S,127?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BY459X-1500S,127 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BY459X-1500S,127?
BY459X-1500S,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BY459X-1500S,127 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BY459X-1500S,127?
For technical support, including BY459X-1500S,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BY459X-1500S,127 requirements.
6.How does Aetrix verify that BY459X-1500S,127 is sourced from the original manufacturer or authorized distributors?
All BY459X-1500S,127 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BY459X-1500S,127 meets industry standards.
7.What is the process for return or replacement of BY459X-1500S,127?
All BY459X-1500S,127 units undergo pre-shipment inspection (PSI). If there is an issue with BY459X-1500S,127, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BY459X-1500S,127 part is unused and in its original packaging.
Return procedure for BY459X-1500S,127:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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