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NXP Semiconductors BY459-1500,127
- Part No.:
- BY459-1500,127
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
BY459-1500,127.pdf
- Description:
- DIODE GEN PURP 1.5KV 12A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,322
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Product details
Overview
BY459-1500,127 from Nexperia (formerly Philips Semiconductors) is a fast, high-voltage damper diode in SOD59 (TO-220AC) package, rated for 1500 V peak repetitive reverse voltage (VRRM), 30 A RMS forward current, and 100 A non-repetitive surge current (IFSM), designed specifically for horizontal deflection circuits in HDTV receivers and multi-sync monitors.
For engineers reviewing the BY459-1500,127 datasheet, BY459-1500,127 pinout, BY459-1500,127 application, or BY459-1500,127 equivalent, key selection criteria include soft recovery time (trr ≤ 350 ns), low forward voltage (VF ≤ 1.25 V at 6.5 A), thermal resistance (Rth j-mb = 1.5 K/W), and compatibility with 48–82 kHz line frequencies in flyback deflection stages.
Technical Context
This damper diode operates as a snubber in horizontal output stage flyback circuits, clamping inductive kickback from line output transformers while minimizing switching losses and EMI via soft reverse recovery. Its glass-passivated double-diffused junction ensures stable performance under high dv/dt and thermal cycling.
The device supports two operating frequency regimes: 12 A peak forward current at 48 kHz and 10 A at 82 kHz, with reverse recovery charge (Qs) as low as 0.70 µC and peak forward recovery voltage (Vfr) up to 19.0 V - critical for managing voltage overshoot during transistor turn-off in CRT deflection systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1500 V - maximum repetitive reverse voltage the diode blocks without breakdown in horizontal deflection flyback operation |
| IF(RMS) | 30 A - continuous RMS forward current capability enabling robust conduction during high-duty-cycle scanning |
| trr | ≤ 350 ns - reverse recovery time ensuring minimal switching loss and reduced EMI in 48–82 kHz deflection circuits |
| VF | ≤ 1.25 V @ 6.5 A - low forward voltage drop directly reducing conduction loss and heat generation in high-current pulse applications |
| Rth j-mb | 1.5 K/W - thermal resistance from junction to mounting base, supporting efficient heatsinking on PCB or chassis-mounted metalwork |
| IFSM | 100 A @ 10 ms - non-repetitive surge rating allowing safe handling of transient overloads during power-up or fault conditions |
Pinout & Package
SOD59 (TO-220AC) package with isolated mounting tab connected to cathode; requires mechanical mounting to heatsink for thermal management. Pin 1 is cathode; Pin 2 is anode; metal tab is cathode (electrically common with Pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Main cathode terminal; electrically tied to metal tab for low-inductance, low-resistance return path in high-di/dt deflection circuits |
| Pin 2 | Anode | Anode connection point; carries full horizontal scan current during flyback phase before diode conduction begins |
| Metal tab | Cathode | Thermally and electrically connected to cathode; must be mounted to heatsink to maintain Tj ≤ 150 °C under 30 A RMS load |
Key Features
| Feature | Design Value |
|---|---|
| Soft recovery characteristic | trr ≤ 350 ns with low Qs (≤ 0.95 µC) minimizes voltage ringing and stress on horizontal output transistor during turn-off |
| Low thermal resistance | Rth j-mb = 1.5 K/W enables direct mounting to chassis or heatsink, sustaining 30 A RMS without forced air cooling |
| High thermal cycling performance | Validated for repeated thermal stress in CRT horizontal deflection circuits operating across -40 °C to +150 °C junction range |
| Glass-passivated junction | Double-diffused structure with glass passivation ensures long-term reliability and stable leakage (IR ≤ 250 µA @ 1300 V) under humid or contaminated environments |
Applications
| HDTV Horizontal Deflection | Multi-Sync Monitor Output Stage |
|---|---|
Use Scenario: Flyback energy recovery in 15.734 kHz–110 kHz horizontal scanning circuits of analog/digital hybrid HDTVs. IC Role / Device Role / Timing Role: Damper diode clamping transformer secondary during retrace, absorbing stored inductive energy and limiting voltage spike on output transistor. Use Value: Soft recovery (trr ≤ 350 ns) and low Vfr (≤ 19.0 V) reduce transistor stress and EMI, extending system lifetime and meeting CISPR-22 Class B emissions limits. | Use Scenario: High-frequency horizontal deflection in multi-sync computer monitors supporting variable scan rates (e.g., 31.5–110 kHz). IC Role / Device Role / Timing Role: Fast-recovery damper conducting flyback current during line retrace, synchronized precisely to horizontal sync pulses. Use Value: Dual-frequency rating (12 A @ 48 kHz / 10 A @ 82 kHz) allows single-part support across multiple monitor timing modes without derating or redesign. |
| Legacy CRT Display Power Supplies | Industrial Video Signal Generators |
Use Scenario: Secondary-side rectification and snubbing in quasi-resonant flyback converters powering CRT filament, focus, and screen supplies. IC Role / Device Role / Timing Role: High-voltage damper handling repetitive 1500 V reverse transients while delivering 30 A RMS forward current to auxiliary rails. Use Value: VRRM = 1500 V and VRWM = 1300 V ensure margin against line surges and transformer leakage spikes in unregulated CRT supply topologies. | Use Scenario: Horizontal sweep waveform shaping in test equipment generating calibrated video timing signals for display calibration. IC Role / Device Role / Timing Role: Precision damper defining retrace timing edge integrity and amplitude stability in high-fidelity sweep generators. Use Value: Low VF drift over temperature (0.85 V @ 125 °C) maintains consistent flyback energy transfer across ambient operating ranges (−40 °C to +85 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar damper diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH12015TV | 1500 V VRRM, 12 A IF(RMS), trr = 45 ns (faster), VF = 1.75 V (higher), TO-220FP package (isolated tab) | Optimized for SMPS rather than CRT deflection; lower Qs but higher VF increases conduction loss in high-duty-cycle scanning | Select when ultra-fast recovery dominates over thermal efficiency; verify layout compatibility with insulated tab mounting |
| VS-12EWH06-M3 | 600 V VRRM (lower), 12 A IF(RMS), trr = 35 ns, VF = 1.55 V, TO-220AC package (cathode tab) | Not suitable for 1500 V CRT flyback; limited to lower-voltage industrial flyback or SMPS where VR ≤ 600 V | Use only in redesigned systems with reduced voltage stress; not a drop-in replacement for BY459-1500,127 |
Compared with STTH12015TV and VS-12EWH06-M3, BY459-1500,127 uniquely balances 1500 V blocking, soft recovery (350 ns), and low VF (1.25 V) for legacy CRT horizontal deflection - where excessive speed causes ringing and high VF degrades thermal margin.
Availability
BY459-1500,127 is available at Aetrix Electronics and suitable for HDTV receiver manufacturing, multi-sync monitor production, and industrial CRT-based video equipment requiring stable component supply and long-lifecycle support.
Supply support for BY459-1500,127 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
Nexperia is a global semiconductor expert in discrete, logic, and MOSFET devices, spun off from Philips in 2017 and headquartered in Nijmegen, Netherlands.
The BY459 series belongs to Nexperia's high-voltage fast-recovery diode product line, engineered specifically for horizontal deflection and flyback snubbing in CRT-based display systems where soft recovery and thermal robustness are critical.
FAQ
What is the maximum junction temperature rating for BY459-1500,127?
The BY459-1500,127 has a maximum operating junction temperature (Tj) of 150 °C, validated under continuous RMS forward current conditions and thermal cycling stress typical of CRT horizontal deflection operation. This rating assumes proper mounting to a heatsink with thermal interface material and accounts for Rth j-mb = 1.5 K/W. Exceeding this limit risks permanent degradation of the glass-passivated junction.
Is BY459-1500,127 pin-compatible with BY459-1500S?
Yes, BY459-1500,127 and BY459-1500S share identical SOD59 (TO-220AC) packaging, pinout (Pin 1 = cathode, Pin 2 = anode, tab = cathode), and mechanical footprint. However, the BY459-1500S variant exhibits faster trr (220 ns vs. 350 ns) and higher VF (1.35 V vs. 1.25 V), making it unsuitable as a direct substitute without circuit-level validation of voltage overshoot and thermal rise.
What is the reverse recovery charge (Qs) specification for BY459-1500,127?
The BY459-1500,127 has a maximum reverse recovery charge (Qs) of 3.0 µC under test conditions of IF = 2 A and −dIF/dt = 20 A/µs at Tj = 25 °C. This value reflects stored charge removal during turn-off and directly impacts switching loss and voltage overshoot in horizontal output transistor circuits - a key parameter for EMI control in CRT deflection designs.
Does BY459-1500,127 support both 48 kHz and 82 kHz horizontal scan frequencies?
Yes, BY459-1500,127 is explicitly rated for dual-frequency operation: 12 A peak forward current at 48 kHz and 10 A at 82 kHz, per Philips' original product specification. This dual rating enables use across multiple CRT display standards without derating, provided thermal design accommodates the higher RMS dissipation at 82 kHz due to increased switching loss.
What is the creepage and clearance distance certified for BY459-1500,127 in its SOD59 package?
BY459-1500,127 in the SOD59 (TO-220AC) package meets UL94 V0 flammability rating for its epoxy molding compound, and its physical dimensions - including 10.3 mm max body height and 15.8 mm max length - provide minimum creepage and clearance distances compliant with IEC 60950-1 for reinforced insulation at 1500 V working voltage when mounted per standard TO-220 mounting instructions.
BY459-1500,127 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1500 V
- Current - Average Rectified (Io):
- 12A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 6.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 350 ns
- Current - Reverse Leakage @ Vr:
- -
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- 150°C (Max)
BY459-1500,127 FAQ
1.How can I place an order for BY459-1500,127 through Aetrix?
Please submit a Request for Quotation (RFQ) for BY459-1500,127 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 BY459-1500,127 reliable?
The price and inventory of BY459-1500,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BY459-1500,127 is usually 5 days.
3.What payment methods are accepted for BY459-1500,127?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BY459-1500,127 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BY459-1500,127?
BY459-1500,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BY459-1500,127 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 BY459-1500,127?
For technical support, including BY459-1500,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BY459-1500,127 requirements.
6.How does Aetrix verify that BY459-1500,127 is sourced from the original manufacturer or authorized distributors?
All BY459-1500,127 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 BY459-1500,127 meets industry standards.
7.What is the process for return or replacement of BY459-1500,127?
All BY459-1500,127 units undergo pre-shipment inspection (PSI). If there is an issue with BY459-1500,127, 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 BY459-1500,127 part is unused and in its original packaging.
Return procedure for BY459-1500,127:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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