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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics BYT01-400RL

Name: BYT01-400RL
Brand: STMicroelectronics
SKU: BYT01-400RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BYT01-400RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: BYT01-400RL.pdf

Description:: DIODE GEN PURP 400V 1A DO15

Quantity:: RFQ Add To RFQ list

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Inventory:2,455

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Product details

Overview

BYT01-400RL from STMicroelectronics is a 400 V, 1 A ultrafast recovery rectifier diode in DO-15 axial package, optimized for base-drive switching circuits and freewheeling in SMPS. It delivers low conduction loss (VF ≤ 1.4 V @ 1 A, 100°C), negligible switching loss, and fast reverse recovery (trr ≤ 25 ns @ IF = 0.5 A, IR = 1 A), enabling high-efficiency operation in compact power converters.

For engineers reviewing the BYT01-400RL datasheet, BYT01-400RL pinout, BYT01-400RL application, or BYT01-400RL equivalent, key selection criteria include its 400 V repetitive peak reverse voltage, 30 A non-repetitive surge rating, 150°C maximum junction temperature, DO-15 thermal resistance (45 °C/W on infinite heatsink), and ultrafast trr performance critical for high-frequency switching topologies.

Technical Context

This diode employs ST's planar silicon technology to achieve tightly controlled reverse recovery characteristics and stable forward voltage across temperature. Its ultrafast trr (16–25 ns typ./max) and low Qrr support minimal switching loss in hard-switched flyback and forward converters operating up to several hundred kHz.

The device features low forward recovery voltage (VFP = 9.5 V @ dIF/dt = 50 A/µs) and controlled forward recovery time (tfr = 60 ns), reducing voltage overshoot during turn-on transients in inductive switching paths-critical for protecting IGBTs and MOSFETs in motor drive and SMPS gate drive stages.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	400 V - Withstands repetitive reverse voltage up to 400 V without breakdown, suitable for 230 VAC input rectification with safety margin.
IF(AV)	1 A @ TI = 80°C, δ = 0.5 - Sustains average forward current of 1 A under standard duty-cycle thermal conditions.
trr	16–25 ns - Ultrafast reverse recovery minimizes switching loss and EMI in high-frequency (>100 kHz) power converters.
VF	1.0–1.4 V @ IF = 1 A, Tj = 100°C - Low forward drop reduces conduction loss and improves thermal efficiency in continuous conduction mode.
IFSM	30 A @ tp = 10 ms, sinusoidal - Handles short-duration inrush or fault currents without failure, supporting robust overcurrent resilience.
Rth(j-a)	45 °C/W - Thermal resistance from junction to ambient on infinite heatsink with 10 mm leads, enabling accurate thermal design in open-frame supplies.
IR	0.5 mA @ Tj = 100°C, VR = VRRM - Low leakage preserves efficiency in high-temperature environments like enclosed industrial power modules.

Pinout & Package

BYT01-400RL is housed in a DO-15 axial leaded package with cathode band marking. Leads are tinned copper, epoxy body meets UL 94 V-0, and mechanical dimensions comply with JEDEC DO-15 standard (A: 6.05–6.75 mm, B: 2.95–3.53 mm, C: 26–31 mm, D: 0.71–0.88 mm).

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connected to switch node or inductor output; must withstand dIF/dt up to 50 A/µs during turn-on.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to positive rail or controller reference; blocks 400 V reverse voltage while sustaining <0.5 mA leakage at 100°C.

Key Features

Feature	Design Value
Ultrafast recovery	trr ≤ 25 ns enables >200 kHz switching in flyback converters without excessive loss or ringing.
Low VF at high Tj	VF ≤ 1.4 V @ 100°C ensures stable conduction loss across industrial temperature range.
High surge capability	30 A IFSM supports reliable startup and transient overload handling in unregulated DC-DC stages.
Controlled forward recovery	tfr = 60 ns and VFP = 9.5 V limit voltage overshoot when commutating inductive loads.
UL 94 V-0 epoxy	Flame-retardant encapsulation meets safety requirements for Class II power supplies and industrial equipment.

Applications

Switch-Mode Power Supply Freewheeling

Transistor Base Drive Clamping

Use Scenario: Used as freewheeling diode across primary-side snubber or secondary-side output inductor in offline AC-DC adapters.

IC Role / Device Role / Timing Role: Provides low-loss current path during MOSFET off-time, minimizing voltage spike and energy dissipation.

Use Value: 25 ns trr and 1.4 V VF reduce switching loss by ~35% vs. standard fast recovery diodes at 100 kHz, improving efficiency by 0.8–1.2%.

Use Scenario: Placed across BJT or MOSFET base-emitter/base-gate terminals to clamp negative voltage spikes during turn-off.

IC Role / Device Role / Timing Role: Acts as active clamping diode to suppress inductive kickback and prevent transistor saturation reversal.

Use Value: 60 ns tfr and 9.5 V VFP ensure predictable clamping response with minimal delay, preventing unintended device latch-up in high-dI/dt driver circuits.

DC-DC Converter Output Rectification

Motor Drive Flyback Snubbing

Use Scenario: Rectifies output in isolated 12 V/1 A buck-derived DC-DC module for telecom interface cards.

IC Role / Device Role / Timing Role: Conducts forward current during transformer reset phase; blocks reverse voltage during primary conduction.

Use Value: 400 V VRRM provides 2× margin over 12 V output reflected to primary, ensuring long-term reliability under line surges.

Use Scenario: Integrated into RC-snubber network across IGBT collector-emitter in 24 V BLDC motor control H-bridge.

IC Role / Device Role / Timing Role: Absorbs inductive energy during IGBT turn-off and recirculates it safely through the snubber resistor.

Use Value: 30 A IFSM rating tolerates repeated 25 A peak snubber currents, extending snubber lifetime beyond 10⁶ cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	Same VRRM (400 V), higher IF(AV) = 1.3 A, lower trr = 15 ns, TO-220AC package	Requires heatsink mounting; unsuitable for axial PCB layouts	Select when higher current or lower trr is prioritized and board space allows TO-220 footprint.
ES1D	Lower VRRM = 200 V, same DO-15 package, trr = 35 ns, VF = 1.7 V @ 1 A	Not rated for 400 V systems; limited to 115 VAC input designs	Choose only for cost-sensitive 200 V-class applications where trr margin is acceptable.

Compared with STTH1R04 and ES1D, BYT01-400RL uniquely balances 400 V rating, DO-15 form factor, and 25 ns trr-making it optimal for space-constrained, universal-input SMPS where axial mounting and voltage margin are mandatory.

Availability

BYT01-400RL is available at Aetrix Electronics and suitable for switch-mode power supplies, transistor base-drive protection circuits, and motor drive snubbers requiring stable component supply and consistent DO-15 mechanical fit.

Supply support for BYT01-400RL 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.

BYT01-400RL belongs to ST's ultrafast recovery diode product line, engineered specifically for high-efficiency, high-frequency power conversion where low trr and stable VF across temperature are essential.

FAQ

What is the maximum junction temperature for BYT01-400RL?

The absolute maximum junction temperature (Tj) is 150°C, verified per STMicroelectronics' datasheet Absolute Ratings table. Operation above this temperature risks permanent degradation of silicon structure and increased leakage. Derating curves (Fig. 2) show IF(AV) drops to ~0.7 A at Tamb = 100°C with δ = 0.5, confirming thermal limits under real-world ambient conditions.

Is BYT01-400RL suitable for use in 230 VAC input rectifiers?

Yes-its 400 V VRRM provides sufficient margin for 230 VAC (325 V peak) full-wave rectification, including line surges up to 400 V. The device's low IR (<0.5 mA @ 100°C) prevents thermal runaway in bridge configurations, and its DO-15 package supports standard PCB layout practices for AC-DC front-end stages.

How does BYT01-400RL differ from standard fast recovery diodes?

Unlike standard fast recovery diodes (trr ≈ 50–100 ns), BYT01-400RL achieves trr ≤ 25 ns due to optimized carrier lifetime control in ST's planar process. This results in significantly lower switching loss, reduced EMI generation, and improved efficiency in converters operating above 100 kHz-verified by dynamic test conditions in the datasheet (IF = 0.5 A, IR = 1 A, dIF/dt = −15 A/µs).

Can BYT01-400RL be used in place of BYT01-400 in automated assembly?

Yes-BYT01-400RL is the tape-and-reel variant of BYT01-400 (6000 pcs/reel), sharing identical electrical specs, DO-15 package dimensions, and marking ("BYT01-400"). The "RL" suffix denotes reel packaging only; no parametric or mechanical differences exist, making it fully compatible with pick-and-place machines calibrated for DO-15 components.

BYT01-400RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-204AC, DO-15, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 1 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-15

Operating Temperature - Junction:: -40°C ~ 150°C

BYT01-400RL FAQ

1.How can I place an order for BYT01-400RL through Aetrix?

Please submit a Request for Quotation (RFQ) for BYT01-400RL 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 BYT01-400RL reliable?

The price and inventory of BYT01-400RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BYT01-400RL is usually 5 days.

3.What payment methods are accepted for BYT01-400RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BYT01-400RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BYT01-400RL?

BYT01-400RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BYT01-400RL 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 BYT01-400RL?

For technical support, including BYT01-400RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BYT01-400RL requirements.

6.How does Aetrix verify that BYT01-400RL is sourced from the original manufacturer or authorized distributors?

All BYT01-400RL 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 BYT01-400RL meets industry standards.

7.What is the process for return or replacement of BYT01-400RL?

All BYT01-400RL units undergo pre-shipment inspection (PSI). If there is an issue with BYT01-400RL, 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 BYT01-400RL part is unused and in its original packaging.

Return procedure for BYT01-400RL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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