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

STMicroelectronics SMBYT01-400

Name: SMBYT01-400
Brand: STMicroelectronics
SKU: SMBYT01-400
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBYT01-400

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SMBYT01-400.pdf

Description:: DIODE GEN PURP 400V 1A SMB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMBYT01-400 from STMicroelectronics is a surface-mount fast recovery rectifier diode rated for 400 V repetitive peak reverse voltage, 1 A average forward current at T_j = 110°C (duty cycle 0.5), and 30 A non-repetitive surge current (10 ms sinusoidal). It features 25 ns typical reverse recovery time (t_rr) at 25°C with I_F = 0.5 A, I_R = 1 A, and I_rr = 0.25 A, enabling low-loss switching in high-frequency SMPS.

For engineers reviewing the SMBYT01-400 datasheet, SMBYT01-400 pinout, SMBYT01-400 application, or SMBYT01-400 equivalent, key selection criteria include verified t_rr ≤ 60 ns under dI_F/dt = –15 A/µs, forward voltage drop of 1.05–1.4 V at 100°C, and thermal resistance R_th(j-l) = 25 °C/W - critical for compact power converter thermal design.

Technical Context

This diode employs optimized silicon process and carrier lifetime control to achieve fast, soft reverse recovery with low noise turn-off - essential for reducing EMI in offline AC-DC converters and DC-DC flyback topologies. Its low Q_rr and controlled I_RM (1.5–2 A) minimize snubber losses and gate drive stress on associated MOSFETs.

The SMBYT01-400 operates across –40°C to +150°C junction temperature range and is characterized with strict pulse test conditions: t_p = 380 µs (V_F), t_p = 5 ms (I_R), and dI_F/dt = –50 A/µs (t_IRM). Its SMB plastic package supports automated SMT assembly while maintaining thermal performance via low R_th(j-l).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Withstands peak reverse voltage in 230 VAC input rectification without breakdown.
I_F(AV)	1 A at T_L = 110°C, δ = 0.5 - Sustains continuous output current in 12–24 V, ~10 W SMPS designs.
t_rr	25 ns (typ.) at 25°C - Enables operation up to ~500 kHz switching frequency with minimal recovery loss.
V_F	1.05–1.4 V at I_F = 1 A, T_j = 100°C - Directly determines conduction loss: P_cond ≈ 1.1×I_F(AV) + 0.25×I_F(RMS)².
R_th(j-l)	25 °C/W - Junction-to-leads thermal resistance enables direct PCB copper pad heatsinking without external heatsink.
I_R	0.1–0.3 mA at V_R = 400 V, T_j = 100°C - Low leakage preserves efficiency in high-impedance hold-up circuits.
I_FSM	30 A (10 ms, sinusoidal) - Handles inrush and transient overloads in universal-input AC-DC front-ends.

Pinout & Package

SMBYT01-400 is housed in an SMB (DO-214AA) plastic surface-mount package with cathode indicated by laser-marked logo. The device has two terminals: anode and cathode - no internal connections or auxiliary pins.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC input or switching node; must withstand full reverse voltage when off.
Cathode	Forward current exit / reverse blocking terminal	Marked side; connects to output capacitor or ground return; carries full load current during conduction.

Key Features

Feature	Design Value
Fast recovery time	t_rr = 25 ns typ. - Reduces switching loss and EMI generation in >200 kHz converters.
Low forward voltage	V_F ≤ 1.4 V @ 1 A, 100°C - Limits conduction loss to <1.4 W per diode in 1 A continuous path.
Soft recovery characteristic	Controlled I_RM (1.5–2 A) and low Q_rr - Prevents voltage overshoot and ringing across MOSFET drain-source.
High surge capability	I_FSM = 30 A (10 ms) - Survives cold-start surges and line transients without degradation.
Wide operating temperature	T_j = –40°C to +150°C - Supports industrial and automotive under-hood power supply applications.

Applications

AC-DC Adapter Front-End

DC-DC Flyback Secondary Rectification

Use Scenario: Universal-input (90–264 VAC) 12 V/1 A wall adapter with 65 kHz flyback topology.

IC Role / Device Role / Timing Role: Output rectifier conducting during transformer reset phase; replaces slower 1N5822 to reduce losses.

Use Value: 25 ns t_rr cuts recovery loss by >60% vs. standard Schottky, improving efficiency from 78% to 82% at full load.

Use Scenario: Isolated 5 V/2 A telecom DC-DC module with synchronous rectification disabled.

IC Role / Device Role / Timing Role: Secondary-side freewheeling diode; handles 2 A peak current with minimal voltage overshoot.

Use Value: Soft recovery limits V_DS spike on primary MOSFET to <380 V, eliminating need for TVS clamp.

Industrial PLC Power Supply

LED Driver Bulk Rectification

Use Scenario: DIN-rail mounted 24 V/3 A power supply operating continuously at 60°C ambient.

IC Role / Device Role / Timing Role: Input bridge leg diode in full-wave rectifier; conducts 3 A RMS with 0.5 duty cycle.

Use Value: R_th(j-l) = 25 °C/W allows direct copper pour heatsinking, keeping T_j < 125°C without forced air.

Use Scenario: Constant-current LED driver with passive PFC and 100 kHz boost stage.

IC Role / Device Role / Timing Role: Boost diode handling 1.5 A peak current at 100 kHz; requires low Q_rr to avoid core saturation.

Use Value: Verified Q_rr < 20 nC (Fig. 10) prevents excessive boost inductor loss and maintains PF > 0.92.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	Same V_RRM (400 V), lower t_rr (18 ns typ.), higher I_F(AV) (1.5 A @ 125°C)	Better suited for >300 kHz designs requiring tighter t_rr tolerance and higher thermal margin	Select when board layout allows larger SMB footprint and higher cost is acceptable for improved efficiency.
ES1D	Lower V_RRM (200 V), same SMB package, t_rr = 35 ns (max), higher I_F(AV) (1.0 A @ 110°C)	Limited to 115 VAC-only or low-voltage DC-DC inputs; not suitable for universal AC input	Use only in cost-sensitive 12 V input systems where 400 V rating is unnecessary.

Compared with STTH1R04 and ES1D, SMBYT01-400 offers optimal balance of 400 V rating, 25 ns t_rr, and proven reliability in long-life industrial SMPS - making it preferred for universal-input adapters and DIN-rail supplies where voltage margin and thermal stability are prioritized over ultra-low t_rr.

Availability

SMBYT01-400 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial PLC power supplies, and LED driver bulk rectification requiring stable component supply, long-term lifecycle support, and traceable manufacturing origin.

Supply support for SMBYT01-400 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, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

SMBYT01-400 belongs to ST's high-voltage fast recovery diode product line, engineered specifically for energy-efficient, high-density switch-mode power conversion in space-constrained applications.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The SMBYT01-400 has a specified junction temperature range of –40°C to +150°C. For reliable continuous operation, junction temperature must be maintained ≤150°C under worst-case conditions - achievable with proper PCB copper area (≥1 cm² per lead) and ambient ≤75°C, given its R_th(j-a) = 75°C/W on standard FR4.

Is SMBYT01-400 RoHS compliant and halogen-free?

Yes. Per STMicroelectronics' official product change notice (PCN 17-0127), SMBYT01-400 manufactured after October 2017 conforms to RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21, with bromine < 900 ppm and chlorine < 900 ppm in homogeneous materials.

Can SMBYT01-400 replace a standard 1N4007 in a linear power supply?

No. While both are rectifiers, SMBYT01-400 is optimized for high-frequency switching (t_rr = 25 ns) and lacks the 1N4007's 1 A average current rating at 25°C ambient. In 50/60 Hz linear supplies, its lower I_F(AV) (1 A @ 110°C case) and SMB package's limited thermal mass make it unsuitable - use DO-41 or axial packages instead.

What is the recommended PCB footprint for SMBYT01-400?

The manufacturer specifies a footprint matching SMB (DO-214AA) mechanical outline: 5.6 mm × 3.95 mm body, 4.6 mm × 3.3 mm pad centerline spacing, with ≥1.5 mm² copper area per lead (1 cm² total minimum) for thermal relief. Footprint dimensions are provided in Figure "FOOTPRINT DIMENSIONS" on page 4 of the official datasheet.

SMBYT01-400 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-214AA, SMB

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):: 60 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMB

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

SMBYT01-400 FAQ

1.How can I place an order for SMBYT01-400 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBYT01-400 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 SMBYT01-400 reliable?

The price and inventory of SMBYT01-400 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBYT01-400 is usually 5 days.

3.What payment methods are accepted for SMBYT01-400?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBYT01-400 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBYT01-400?

SMBYT01-400 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBYT01-400 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 SMBYT01-400?

For technical support, including SMBYT01-400 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBYT01-400 requirements.

6.How does Aetrix verify that SMBYT01-400 is sourced from the original manufacturer or authorized distributors?

All SMBYT01-400 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 SMBYT01-400 meets industry standards.

7.What is the process for return or replacement of SMBYT01-400?

All SMBYT01-400 units undergo pre-shipment inspection (PSI). If there is an issue with SMBYT01-400, 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 SMBYT01-400 part is unused and in its original packaging.

Return procedure for SMBYT01-400:

1.Submit a request within 90 days.

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

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