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

STMicroelectronics STTH3R04U

Name: STTH3R04U
Brand: STMicroelectronics
SKU: STTH3R04U
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH3R04U

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: STTH3R04U.pdf

Description:: DIODE GEN PURP 400V 3A SMB

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Product details

Overview

STTH3R04U from STMicroelectronics is an ultrafast recovery silicon rectifier diode optimized for high-frequency switching applications. It features 400 V repetitive peak reverse voltage (V_RRM), 3 A average forward current (I_F(AV)), 18 ns typical reverse recovery time (t_rr) at 1 A/–100 A/µs, 0.9 V typical forward voltage drop (V_F) at 3 A and 150 °C junction temperature, and is packaged in SMB (DO-214AA) surface-mount format for use in low-voltage inverters and free-wheeling circuits.

For engineers reviewing the STTH3R04U datasheet, STTH3R04U pinout, STTH3R04U application, or STTH3R04U equivalent, key selection criteria include verified t_rr ≤ 25 ns at 125 °C, thermal resistance R_th(j-l) = 25 °C/W (SMB), cathode-band polarity marking, and compatibility with 100 A/µs dI_F/dt transient conditions in SMPS base-drive stages.

Technical Context

This diode employs ST's planar platinum-doped junction technology to achieve negligible switching losses and stable recovery behavior across –65 °C to +175 °C operating range. Its low Q_RR (typ. 35 nC at 3 A, 320 V, 125 °C) and controlled dI_F/dt sensitivity (t_rr varies <15% from 10 to 100 A/µs) support clean turn-off in hard-switched converters.

The SMB package provides 0.12 g mass, 5.10 × 3.30 mm footprint, and 1.5 mm profile-enabling high-density PCB layouts while maintaining R_th(j-a) ≈ 4.5 °C/W on 1 cm² copper. Cathode identification via molded band ensures unambiguous orientation during automated assembly.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Withstands repetitive reverse transients up to 400 V without breakdown in flyback or LLC resonant topologies.
I_F(AV)	3 A at T_lead = 70 °C - Sustains continuous conduction in 24–48 V DC-DC output stages with standard PCB copper area.
t_rr (typ)	18 ns at I_F = 1 A, dI_F/dt = –100 A/µs, V_R = 30 V, T_j = 25 °C - Enables >500 kHz switching without excessive EMI or voltage overshoot.
V_F (typ)	0.9 V at I_F = 3 A, T_j = 150 °C - Minimizes conduction loss P_cond ≈ 0.9×I_F(AV) + 0.083×I_F(RMS)² in thermally constrained designs.
T_j(max)	175 °C - Supports operation in sealed industrial enclosures or automotive under-hood environments with active thermal management.
R_th(j-l)	25 °C/W (SMB) - Allows direct lead-to-heatsink thermal path for pulse-current handling up to 60 A (10 ms, non-repetitive).

Pinout & Package

SMB (DO-214AA) surface-mount package with molded cathode band; 2-terminal device with anode and cathode leads formed for gull-wing soldering. Thermal pad not present; heat transfer occurs via leads and body conduction.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck sync rectifier or emitter in BJT base drive clamp).
Cathode	Forward current exit / reverse blocking terminal	Marked by molded band; ties to higher-potential rail (e.g., V_CC, output capacitor positive, or collector supply).

Key Features

Feature	Design Value
Ultrafast recovery	t_rr = 18 ns typ. enables clean zero-voltage switching in 300–800 kHz SMPS without snubbers.
Low V_F at high T_j	0.9 V at 150 °C reduces thermal runaway risk in parallel configurations and improves efficiency at full load.
Platinum-doped junction	Stable t_rr and Q_RR over temperature (±10% variation from 25–125 °C) simplifies dynamic loss modeling.
ECOPACK® compliance	Lead-free second-level interconnect meets JEDEC JESD97; RoHS-compliant with UL94 V0 epoxy encapsulation.

Applications

Switch-Mode Power Supply Output Rectification

BJT/MOSFET Base/Gate Clamp Protection

Use Scenario: Used as secondary-side freewheeling diode in 24 V/100 W offline flyback converter operating at 350 kHz.

IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during primary switch off-time; recovers before next switching cycle begins.

Use Value: 18 ns t_rr prevents reverse recovery current overlap with primary switch turn-on, reducing switching loss by ≥35% vs. standard fast recovery diodes.

Use Scenario: Placed across BJT base-emitter junction in high-speed motor driver to suppress negative voltage spikes during turn-off.

IC Role / Device Role / Timing Role: Clamping diode conducting only during nanosecond-scale voltage reversal; blocks >400 V reverse transients.

Use Value: 400 V V_RRM and 5 µA leakage at 125 °C ensure reliable clamping without false triggering or thermal drift.

DC-DC Polarity Protection

High-Frequency Inverter Free-Wheeling

Use Scenario: Installed in series with input of 12 V industrial controller to prevent damage from reversed battery connection.

IC Role / Device Role / Timing Role: Forward-conducting protection element with minimal voltage drop; blocks reverse current during miswiring.

Use Value: 0.9 V V_F at 3 A limits power loss to <2.7 W, avoiding thermal shutdown in compact enclosures.

Use Scenario: Employed in half-bridge inverter driving 48 V BLDC motor with 20 kHz PWM carrier frequency.

IC Role / Device Role / Timing Role: Freewheeling path for inductive back-EMF during PWM dead-time; handles 60 A surge peaks.

Use Value: 60 A I_FSM rating and 175 °C T_j(max) sustain repeated 10 ms surges without degradation in motor control loops.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR340 SMB	t_rr = 50 ns (typ), V_F = 1.3 V @ 3 A, 25 °C; same SMB package and 400 V rating.	Higher recovery loss in >300 kHz designs; suitable for cost-sensitive 100–200 kHz supplies.	Select when t_rr < 25 ns is not required and V_F penalty is acceptable for BOM simplification.
Vishay VS-3EYH04-M3/5BT	t_rr = 22 ns (typ), V_F = 0.92 V @ 3 A, 125 °C; SMB package, 400 V, but rated I_F(AV) = 3.0 A at T_c = 115 °C.	Higher thermal derating margin; requires heatsink for sustained 3 A at ambient >70 °C.	Prefer where junction temperature margin is critical and board space allows localized copper pour.

Compared with MUR340 SMB and VS-3EYH04-M3/5BT, STTH3R04U delivers the lowest t_rr (18 ns) and best high-temperature V_F stability (0.9 V @ 150 °C), making it optimal for compact, high-frequency, thermally constrained switching applications without sacrificing surge robustness.

Availability

STTH3R04U is available at Aetrix Electronics and suitable for switch-mode power supplies, motor drive clamping circuits, and DC input polarity protection requiring stable component supply, consistent SMB footprint, and guaranteed 18 ns t_rr performance.

Supply support for STTH3R04U 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.

The STTH ultrafast diode product line targets high-efficiency, high-frequency power conversion systems-specifically engineered to replace slower recovery diodes in SMPS, inverters, and protection circuits where switching loss dominates thermal design.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The STTH3R04U has a maximum operating junction temperature of 175 °C, validated under infinite heatsink conditions with 10 mm lead length. At this temperature, V_F remains 0.9–1.15 V (typ–max) and t_rr increases to ≤35 ns-both within specification limits defined in Table 4 and Table 5 of the official datasheet.

Is the STTH3R04U suitable for synchronous rectification?

No-STTH3R04U is a unidirectional, non-controlled rectifier diode with no gate or control terminal. It cannot be actively switched like a MOSFET-based synchronous rectifier. It functions only as a passive, fast-recovery freewheeling or clamp element in circuits where body diode conduction or discrete diode placement is required.

Does the SMB package include a thermal pad?

No-the STTH3R04U in SMB (DO-214AA) package has no exposed thermal pad. Thermal dissipation relies solely on conduction through the two gull-wing leads and epoxy body. The specified R_th(j-l) = 25 °C/W assumes 10 mm straight lead length on infinite heatsink, per Table 3.

How does reverse recovery charge (Q_RR) vary with temperature?

Q_RR decreases as junction temperature rises: typical values are ~55 nC at 25 °C and ~35 nC at 125 °C (IF = 3 A, VR = 320 V), per Figure 8. This inverse relationship reduces dynamic loss at elevated temperatures, improving thermal stability in high-load conditions.

STTH3R04U Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

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):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMB

Operating Temperature - Junction:: 175°C (Max)

STTH3R04U FAQ

1.How can I place an order for STTH3R04U through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH3R04U 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 STTH3R04U reliable?

The price and inventory of STTH3R04U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH3R04U is usually 5 days.

3.What payment methods are accepted for STTH3R04U?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH3R04U transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH3R04U?

STTH3R04U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH3R04U 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 STTH3R04U?

For technical support, including STTH3R04U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH3R04U requirements.

6.How does Aetrix verify that STTH3R04U is sourced from the original manufacturer or authorized distributors?

All STTH3R04U 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 STTH3R04U meets industry standards.

7.What is the process for return or replacement of STTH3R04U?

All STTH3R04U units undergo pre-shipment inspection (PSI). If there is an issue with STTH3R04U, 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 STTH3R04U part is unused and in its original packaging.

Return procedure for STTH3R04U:

1.Submit a request within 90 days.

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

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