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STMicroelectronics BYT03-400RL
- Part No.:
- BYT03-400RL
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
BYT03-400RL.pdf
- Description:
- DIODE GEN PURP 400V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:3,757
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Product details
Overview
BYT03-400RL from STMicroelectronics is an ultrafast recovery rectifier diode in DO-201AD axial package, rated for 400 V repetitive peak reverse voltage, 3 A average forward current at 55°C, and 25 ns maximum reverse recovery time. It serves as a free-wheeling diode in switch-mode power supplies and base-drive circuits for bipolar transistors.
For engineers reviewing the BYT03-400RL datasheet, BYT03-400RL pinout, BYT03-400RL application, or BYT03-400RL equivalent, key selection criteria include ultrafast trr (≤25 ns), low VF (1.4 V max at 3 A, 100°C), surge capability (60 A IFSM), thermal resistance (20 °C/W on infinite heatsink), and DO-201AD mechanical compatibility.
Technical Context
This diode employs ST's planar 400 V technology optimized for minimal conduction and switching losses. Its ultrafast recovery (trr ≤ 25 ns at IF = 0.5 A, IR = 1 A) enables high-frequency operation in SMPS and motor drive snubbers.
It exhibits low forward voltage drop (VF = 1.0–1.4 V at 3 A, 100°C) and negligible stored charge (Qrr not specified but implied by trr/tfr metrics), supporting efficient energy recycling in inductive load circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - blocks up to 400 V reverse voltage without breakdown in repetitive operation |
| IF(AV) | 3 A at TI = 55°C, δ = 0.5 - continuous DC or pulsed average current handling under standard thermal conditions |
| trr (max) | 25 ns - ensures minimal reverse recovery tail, reducing switching loss and EMI in ≥100 kHz converters |
| VF (max) | 1.4 V at IF = 3 A, Tj = 100°C - limits conduction loss to ~4.2 W at full rated current |
| IFSM | 60 A for tp = 10 ms (sinusoidal) - withstands short-circuit or startup surges in power supply outputs |
| Rth(j-a) | 20 °C/W on infinite heatsink with 10 mm leads - defines thermal derating slope for ambient temperature design |
| IR (max) | 0.5 mA at Tj = 100°C, VR = VRRM - low leakage preserves efficiency in high-temperature hold-off stages |
Pinout & Package
DO-201AD axial package: hermetically sealed glass body with two tinned copper alloy leads (anode and cathode), 9.5 mm body length, 25.4 mm overall length, 1.3 mm lead diameter, and UL 94 V-0 epoxy encapsulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Forward current entry terminal | Connected to positive side of inductive load or transistor collector/emitter during freewheeling |
| Cathode (Lead 2) | Forward current exit / reverse blocking terminal | Connected to circuit ground or low-side switch node; sustains 400 V reverse bias during off-state |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast recovery | trr ≤ 25 ns enables use in 100–500 kHz SMPS without excessive switching loss or ringing |
| Low forward voltage | VF ≤ 1.4 V at 3 A/100°C reduces conduction loss vs. standard fast recovery diodes (typically >1.7 V) |
| Negligible switching losses | Combined low Qrr and fast tfr (75 ns) minimize energy dissipation during turn-on/turn-off transitions |
| High surge robustness | 60 A non-repetitive surge rating supports reliable operation during output short-circuit or cold-start events |
Applications
| Switch-Mode Power Supply Output Rectification | Transistor Base-Drive Clamping |
|---|---|
Use Scenario: Used in secondary-side rectification of offline AC/DC adapters and DC/DC converters operating at 100–300 kHz. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during MOSFET/BJT off-time; recovers before next switching cycle. Use Value: 25 ns trr prevents cross-conduction loss and reduces output voltage overshoot compared to 50+ ns diodes. | Use Scenario: Placed across BJT base-emitter junction to clamp negative voltage spikes during fast turn-off. IC Role / Device Role / Timing Role: Fast clamping diode limiting reverse base voltage to <1 V, preventing BJT latch-up or damage. Use Value: Sub-30 ns recovery ensures immediate conduction at edge of base drive transition, suppressing >10 ns spike durations. |
| Inductive Load Snubber Network | DC Motor Commutation Suppression |
Use Scenario: Integrated into RCD snubber across relay coils or solenoid drivers in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Absorbs inductive kickback energy during coil de-energization; conducts only during transient recovery phase. Use Value: Low trr and 400 V VRRM allow clean energy transfer to snubber capacitor without voltage doubling or oscillation. | Use Scenario: Mounted across brushed DC motor terminals to suppress arcing and EMI during commutation. IC Role / Device Role / Timing Role: Bidirectional freewheeling path for armature inductance current during brush transition. Use Value: 3 A IF(AV) and 60 A IFSM handle peak stall currents; 150°C Tj rating ensures reliability in enclosed motor housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH3L04 | TO-220AC package, same VRRM (400 V), IF(AV) = 3 A, trr = 25 ns, VF = 1.35 V typ @ 3 A | Requires heatsink mounting; unsuitable for axial PCB layouts or space-constrained designs | Select when higher thermal mass or forced-air cooling is available and DO-201AD footprint is incompatible |
| ES3J | SMA package, VRRM = 600 V, IF(AV) = 3 A, trr = 35 ns, VF = 1.7 V max @ 3 A | Higher voltage rating but slower recovery and higher VF increase conduction + switching loss in 400 V systems | Select only if 600 V margin is mandatory and 10 ns trr penalty is acceptable for lower-frequency operation |
Compared with STTH3L04 and ES3J, BYT03-400RL offers optimal balance of axial form factor, 400 V rating, 25 ns trr, and 1.4 V VF-making it preferred for compact, high-frequency SMPS where leaded DO-201AD mounting and thermal constraints align.
Availability
BYT03-400RL is available at Aetrix Electronics and suitable for switch-mode power supplies, transistor base-drive protection circuits, and inductive load snubbers requiring stable component supply and consistent DO-201AD mechanical fit.
Supply support for BYT03-400RL 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
BYT03-400RL belongs to ST's ultrafast recovery diode product line, engineered specifically for high-efficiency, high-frequency power conversion where low trr and low VF are critical to system-level efficiency and EMI compliance.
FAQ
What is the maximum junction temperature for BYT03-400RL?
The absolute maximum operating junction temperature is 150°C, as specified in the Absolute Maximum Ratings table. Operation above this temperature risks permanent degradation of the PN junction and increased reverse leakage. Derating curves in Figure 2 show usable IF(AV) drops to zero at 150°C ambient when no heatsink is used.
Is BYT03-400RL suitable for 500 kHz operation?
Yes - its 25 ns maximum reverse recovery time allows reliable operation up to approximately 500 kHz in hard-switched topologies, provided layout minimizes parasitic inductance and dIF/dt remains within datasheet test conditions (e.g., ≤15 A/µs). At higher frequencies, verify tfr and VFP behavior using Figures 7–8.
How does lead length affect thermal performance?
Thermal resistance junction-to-ambient (Rth(j-a)) varies inversely with lead length: Figure 3 shows Rth(j-a) decreases from ~75 °C/W at 5 mm leads to 20 °C/W at 10 mm leads on an infinite heatsink. Longer straight leads improve heat conduction away from the die but must comply with AN1471 bending requirements (≥15 mm straight section post-bend).
Does BYT03-400RL have avalanche rating?
No - the datasheet does not specify avalanche energy (EAS) or unclamped inductive switching (UIS) capability. It is not rated for repetitive avalanche operation. For circuits subject to inductive switching stress beyond VRRM, add external clamping or select an avalanche-rated diode such as STTH8R06D.
BYT03-400RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 55 ns
- Current - Reverse Leakage @ Vr:
- 20 µA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- 150°C (Max)
BYT03-400RL FAQ
1.How can I place an order for BYT03-400RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BYT03-400RL 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 BYT03-400RL reliable?
The price and inventory of BYT03-400RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BYT03-400RL is usually 5 days.
3.What payment methods are accepted for BYT03-400RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BYT03-400RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BYT03-400RL?
BYT03-400RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BYT03-400RL 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 BYT03-400RL?
For technical support, including BYT03-400RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BYT03-400RL requirements.
6.How does Aetrix verify that BYT03-400RL is sourced from the original manufacturer or authorized distributors?
All BYT03-400RL 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 BYT03-400RL meets industry standards.
7.What is the process for return or replacement of BYT03-400RL?
All BYT03-400RL units undergo pre-shipment inspection (PSI). If there is an issue with BYT03-400RL, 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 BYT03-400RL part is unused and in its original packaging.
Return procedure for BYT03-400RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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