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NXP Semiconductors BY329X-1200,127
- Part No.:
- BY329X-1200,127
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
BY329X-1200,127.pdf
- Description:
- DIODE GEN PURP 1.2KV 8A TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:4,787
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Product details
Overview
BY329X-1200,127 from Nexperia (formerly Philips Semiconductors) is a glass-passivated fast soft-recovery rectifier diode in SOD113 package, rated for 1200 V peak repetitive reverse voltage (VRRM), 8 A average forward current (IF(AV)), and 145 ns maximum reverse recovery time (trr). It delivers low forward voltage drop (VF ≤ 1.85 V at 20 A), high thermal cycling performance, and isolated mounting tab - optimized for TV receivers, monitors, and switched-mode power supplies.
For engineers reviewing the BY329X-1200,127 datasheet, BY329X-1200,127 pinout, BY329X-1200,127 application, or BY329X-1200,127 equivalent, key selection criteria include VRRM = 1200 V, IF(AV) = 8 A, trr ≤ 145 ns, soft recovery behavior, and SOD113 mechanical isolation for heatsink mounting.
Technical Context
This device employs double-diffused silicon construction with glass passivation to achieve fast switching and soft reverse recovery-minimizing voltage overshoot and EMI during turn-off. Its soft recovery characteristic is confirmed by trr ≤ 145 ns under IF = 1 A, VR > 30 V, and -dIF/dt = 50 A/µs conditions, with Qs ≤ 0.7 µC and dIR/dt ≤ 60 A/µs.
The SOD113 package provides electrical isolation between terminals and external heatsink (Visol = 2500 V RMS), enabling direct mounting without insulating washers. Thermal resistance junction-to-heatsink is 4.8 K/W with compound, supporting stable operation up to Tj = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1200 V - supports high-voltage DC bus applications in SMPS and CRT-based displays |
| IF(AV) | 8 A - continuous conduction capability at Ths ≤ 83 °C with square-wave current |
| trr | ≤145 ns - enables efficient high-frequency rectification with reduced switching loss |
| VF | ≤1.85 V @ 20 A - lowers conduction loss and improves system efficiency |
| Visol | 2500 V RMS - permits direct heatsink mounting without additional insulation |
| Rth j-hs | 4.8 K/W - ensures effective thermal transfer when using heatsink compound |
| Qs | ≤0.7 µC - contributes to soft recovery, limiting voltage spikes and EMI |
Pinout & Package
SOD113 package with electrically isolated seating plane; 2-pin leaded configuration; net mass 2 g; UL94 V0 epoxy; designed for through-hole mounting and heatsink integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Output terminal for forward conduction; connects to positive rail in bridge or half-wave configurations |
| 2 | Anode | Input terminal for forward conduction; connects to AC input or transformer secondary |
| Tab (seating plane) | Isolated heatsink interface | Electrically isolated from both pins; enables direct thermal coupling to chassis/heatsink without dielectric pads |
Key Features
| Feature | Design Value |
|---|---|
| Fast soft-recovery characteristic | trr ≤ 145 ns with controlled dIR/dt ≤ 60 A/µs and Qs ≤ 0.7 µC - reduces ringing and EMI in high-frequency SMPS |
| Glass-passivated double-diffused junction | Enhances reliability under thermal cycling and humidity exposure - validated for TV and monitor environments |
| Isolated mounting tab | 2500 V RMS isolation between terminals and heatsink - eliminates need for mica washers or silicone pads |
| Low forward voltage drop | VF ≤ 1.85 V at 20 A - cuts conduction losses by ~15% vs. standard FRD equivalents at same current |
Applications
| TV Power Rectification | Monitor HV Supply |
|---|---|
Use Scenario: High-voltage secondary rectification in CRT television flyback-derived power supplies. IC Role / Device Role / Timing Role: Main output rectifier handling 1200 V PIV and 8 A average load in quasi-resonant converters. Use Value: Soft recovery minimizes stress on flyback transformer and snubber components; isolated tab simplifies heatsinking in compact chassis layouts. | Use Scenario: Line-scan and focus voltage generation in analog computer monitors. IC Role / Device Role / Timing Role: Fast, low-loss rectifier in voltage multiplier chains feeding CRT anode supplies. Use Value: 145 ns trr enables stable operation at 15.625 kHz horizontal scan frequency; 2500 V isolation prevents arcing to grounded metal frames. |
| Industrial SMPS Output Stage | AC-DC Adapter Front-End |
Use Scenario: Secondary-side rectification in 100–300 W industrial open-frame power supplies. IC Role / Device Role / Timing Role: High-reliability output diode in full-wave center-tapped or bridge configurations. Use Value: 150 °C max junction temperature and 4.8 K/W Rth j-hs support continuous operation under forced-air cooling without derating. | Use Scenario: Input rectification stage in universal-input (85–265 VAC) offline adapters. IC Role / Device Role / Timing Role: Bridge leg diode handling surge currents up to 65 A IFSM during cold-start. Use Value: 65 A non-repetitive surge rating and soft recovery reduce risk of failure during inrush events and improve long-term field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast rectifier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R06D | VRRM = 600 V (lower); trr = 60 ns (faster); VF = 1.7 V @ 8 A; TO-220AC package | Not suitable for 1200 V systems; requires insulating hardware due to conductive tab | Select only if system VRRM ≤ 600 V and faster trr is prioritized over voltage rating |
| VS-8EWH06FN-M3 | VRRM = 600 V; trr = 65 ns; VF = 1.65 V @ 8 A; DPAK surface-mount package | Surface-mount only; no isolated tab; unsuitable for direct heatsink mounting | Prefer for space-constrained PCBs where isolation and 1200 V rating are not required |
Compared with STTH8R06D and VS-8EWH06FN-M3, the BY329X-1200,127 uniquely combines 1200 V rating, soft recovery, and electrically isolated SOD113 packaging - making it irreplaceable in legacy CRT and high-isolation industrial rectifier designs.
Availability
BY329X-1200,127 is available at Aetrix Electronics and suitable for TV receiver power supplies, monitor HV circuits, and industrial switched-mode power supplies requiring stable component supply, long-lifecycle support, and proven thermal robustness.
Supply support for BY329X-1200,127 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions - spun off from Philips in 2017 and now part of Beijing JianGuang Asset Management Co., Ltd.
The BY329X series belongs to Nexperia's high-voltage fast soft-recovery rectifier family, engineered specifically for reliability-critical analog power conversion in consumer display and industrial power equipment.
FAQ
What is the peak repetitive reverse voltage rating of the BY329X-1200,127?
The BY329X-1200,127 has a peak repetitive reverse voltage (VRRM) rating of 1200 V, verified per IEC 134 limiting values. This rating applies under standard operating conditions with junction temperature ≤150 °C and is critical for use in high-voltage flyback and line-powered rectifier circuits where transient overvoltages must be safely clamped.
Does the BY329X-1200,127 have an electrically isolated mounting tab?
Yes, the BY329X-1200,127 features an electrically isolated seating plane (tab) rated for 2500 V RMS isolation between terminals and external heatsink. This isolation is confirmed in the Philips product specification and enables direct mechanical attachment to grounded metal chassis without insulating hardware - a key advantage over TO-220 or DPAK alternatives.
What is the maximum reverse recovery time for the BY329X-1200,127?
The BY329X-1200,127 has a maximum reverse recovery time (trr) of 145 ns, measured at IF = 1 A, VR > 30 V, and -dIF/dt = 50 A/µs. This value is specified in the "Dynamic Characteristics" section of the official datasheet and reflects its soft-recovery behavior, which suppresses voltage overshoot during commutation in high-frequency SMPS.
Can the BY329X-1200,127 be used in place of the BY329F-1200 variant?
No - the BY329X-1200,127 uses the SOD113 package with isolated tab and 2500 V RMS isolation, while the BY329F-1200 uses the SOD100 package with only 1500 V isolation. Mechanical dimensions, thermal resistance (Rth j-hs = 4.8 K/W vs. 5.9 K/W), and mounting requirements differ significantly; substitution requires PCB and heatsink redesign.
What is the average forward current rating for the BY329X-1200,127 at 83 °C heatsink temperature?
The BY329X-1200,127 is rated for 8 A average forward current (IF(AV)) when the heatsink temperature (Ths) is maintained at ≤83 °C with square-wave current (δ = 0.5). This rating assumes negligible switching and reverse current losses, and is defined in the "Limiting Values" table of the Philips product specification.
BY329X-1200,127 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):
- 1200 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.85 V @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 145 ns
- Current - Reverse Leakage @ Vr:
- 1 mA @ 1000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
- Operating Temperature - Junction:
- 150°C (Max)
BY329X-1200,127 FAQ
1.How can I place an order for BY329X-1200,127 through Aetrix?
Please submit a Request for Quotation (RFQ) for BY329X-1200,127 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 BY329X-1200,127 reliable?
The price and inventory of BY329X-1200,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BY329X-1200,127 is usually 5 days.
3.What payment methods are accepted for BY329X-1200,127?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BY329X-1200,127 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BY329X-1200,127?
BY329X-1200,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BY329X-1200,127 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 BY329X-1200,127?
For technical support, including BY329X-1200,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BY329X-1200,127 requirements.
6.How does Aetrix verify that BY329X-1200,127 is sourced from the original manufacturer or authorized distributors?
All BY329X-1200,127 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 BY329X-1200,127 meets industry standards.
7.What is the process for return or replacement of BY329X-1200,127?
All BY329X-1200,127 units undergo pre-shipment inspection (PSI). If there is an issue with BY329X-1200,127, 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 BY329X-1200,127 part is unused and in its original packaging.
Return procedure for BY329X-1200,127:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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