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

STMicroelectronics STTH3R04Q

Name: STTH3R04Q
Brand: STMicroelectronics
SKU: STTH3R04Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH3R04Q

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: STTH3R04Q.pdf

Description:: DIODE GEN PURP 400V 3A DO15

Quantity:: RFQ Add To RFQ list

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Inventory:7,675

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Product details

Overview

STTH3R04Q from STMicroelectronics is a 400 V, 3 A ultrafast recovery diode using platinum-doped planar technology, optimized for low-loss switching in base-drive and transistor circuits. It delivers typ. 18 ns reverse recovery time (trr), 0.9 V forward voltage at 150 °C, and operates up to 175 °C junction temperature - enabling use in high-frequency inverters and polarity protection.

For engineers reviewing the STTH3R04Q datasheet, STTH3R04Q pinout, STTH3R04Q application, or STTH3R04Q equivalent, key selection criteria include its DO-15 axial package thermal resistance (25 °C/W junction-to-lead), negligible switching losses, and validated performance under dIF/dt up to 200 A/µs at 125 °C.

Technical Context

This ultrafast diode employs Pt-doping to minimize minority carrier lifetime, achieving low trr and IRM while maintaining low VF. Its dynamic behavior is characterized by 75 ns forward recovery time (tfr) and 2.5 V forward recovery voltage (VFP) at 3 A and 100 A/µs dIF/dt.

Thermal design relies on conduction cooling via leads: Rth(j-l) = 25 °C/W (DO-15, 10 mm lead length on infinite heatsink). Reverse leakage remains ≤50 µA at 125 °C and VR = 400 V, supporting stable operation in high-temperature industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	400 V - blocks repetitive reverse voltages up to 400 V without breakdown in SMPS and inverter bridge legs.
IF(AV)	3 A - average forward current rating at Tlead = 70 °C with DO-15 package, defining continuous conduction capability.
trr (typ)	18 ns - measured at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V, Tj = 25 °C; enables >1 MHz switching in resonant converters.
VF (typ)	0.9 V - forward voltage at IF = 3.0 A and Tj = 150 °C; directly determines conduction loss P ≈ 0.9×IF + 0.083×IF²(RMS).
Tj (max)	175 °C - maximum junction temperature; allows operation in sealed enclosures or near heat-generating components.
IRM (max)	5.5 A - peak reverse recovery current at IF = 3.0 A, dIF/dt = −200 A/µs, VR = 320 V, Tj = 125 °C; informs snubber sizing.
Rth(j-l)	25 °C/W - junction-to-lead thermal resistance (DO-15, 10 mm leads); defines temperature rise per watt dissipated into PCB traces.

Pinout & Package

STTH3R04Q is housed in a DO-15 axial leaded package with cathode indicated by a band. Leads are tinned copper, compliant with JEDEC JESD97 and RoHS/ECOPACK® requirements.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-side switch node or input rail; must withstand surge current IFSM = 60 A (10 ms, sinusoidal).
Cathode	Forward current exit / reverse blocking terminal	Marked by colored band; ties to switching node or output rail; sustains full VRRM during off-state with <50 µA leakage at 125 °C.

Key Features

Feature	Design Value
Ultrafast recovery	trr = 18 ns typ. at 100 A/µs dIF/dt ensures minimal switching loss and EMI in >500 kHz DC-DC converters.
Low VF at high Tj	0.9 V typ. at 150 °C reduces conduction loss drift in thermally stressed environments like motor drive heatsinks.
High Tj rating	175 °C max junction temperature supports operation in unventilated industrial controls without derating.
Platinum-doped planar structure	Enables precise control of carrier lifetime for consistent trr and IRM across production lots and temperature.
DO-15 mechanical robustness	Rated for 1.16 g weight and 10 mm lead length; validated for wave soldering and board-level mechanical stress.

Applications

Switch-Mode Power Supply Output Rectification

Motor Drive Freewheeling Diode

Use Scenario: Secondary-side rectification in 30–100 W offline flyback or forward converters operating at 65–130 kHz.

IC Role / Device Role / Timing Role: Fast-recovery freewheel path for transformer reset; clamps inductive kick during MOSFET off-time.

Use Value: 18 ns trr minimizes reverse conduction overlap loss with synchronous FETs; 0.9 V VF lowers output loss at full load.

Use Scenario: Bidirectional freewheeling path across H-bridge motor windings in 24–48 V BLDC drives.

IC Role / Device Role / Timing Role: Provides low-loss return path for back-EMF current during PWM dead-time.

Use Value: 5.5 A IRM at 125 °C prevents snap-off failure during high-dI/dt commutation; DO-15 axial form factor simplifies heatsinking.

Solar Microinverter DC Link Protection

Industrial Polarity Reversal Guard

Use Scenario: Reverse-polarity blocking and transient clamping on PV string inputs of single-phase microinverters.

IC Role / Device Role / Timing Role: Unidirectional current gate between panel and MPPT stage; absorbs line transients.

Use Value: 400 V VRRM withstands string open-circuit voltage surges; 175 °C Tj rating accommodates rooftop ambient extremes.

Use Scenario: Input polarity protection for 12–24 V programmable logic controllers and sensor interfaces.

IC Role / Device Role / Timing Role: Series-connected anode-in configuration to block reverse supply connection.

Use Value: 3 A IF(AV) supports continuous 2 A system loads; 5 µA IR at 25 °C ensures negligible standby drain.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06	600 V VRRM, 3 A IF(AV), trr = 35 ns (typ), VF = 1.15 V @ 150 °C	Higher voltage margin but slower recovery; suited for 400–600 V bus systems where dV/dt is lower.	Select when system VBUS exceeds 450 V but switching frequency is ≤100 kHz.
UF3004	400 V VRRM, 3 A IF(AV), trr = 50 ns (typ), VF = 1.25 V @ 25 °C, no 125 °C VF spec	Higher VF and longer trr increase conduction and switching losses; lacks high-Tj characterization.	Acceptable only for cost-sensitive, non-thermally constrained 50–60 Hz rectification or low-frequency clamp.

Compared with STTH3R04Q, STTH3L06 trades speed for voltage headroom, while UF3004 sacrifices both recovery performance and high-temperature VF stability - making STTH3R04Q optimal for thermally demanding, high-frequency switching where loss minimization is critical.

Availability

STTH3R04Q is available at Aetrix Electronics and suitable for high-frequency inverters, motor drive freewheeling, and industrial polarity protection requiring stable component supply and DO-15 axial packaging.

Supply support for STTH3R04Q 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion, with STTH3R04Q specifically engineered for ultrafast switching in compact, thermally constrained systems using axial leaded packages.

FAQ

What is the maximum allowable lead temperature during soldering for STTH3R04Q?

The STTH3R04Q DO-15 package is rated for wave soldering per JEDEC J-STD-020. Peak lead temperature must not exceed 260 °C for ≤10 seconds. Preheating to 150 °C and controlled ramp rates prevent thermal shock to the epoxy body and internal die bonds.

Can STTH3R04Q replace a standard FR107 in a 100 kHz flyback converter?

Yes - STTH3R04Q offers significantly lower trr (18 ns vs. ~500 ns for FR107) and reduced reverse recovery charge (QRR), cutting switching losses by >70% at 100 kHz. Its 0.9 V VF at 150 °C also improves efficiency over FR107's typical 1.3 V, provided layout accommodates DO-15 lead spacing.

Is STTH3R04Q suitable for synchronous rectification topologies?

No - STTH3R04Q is a unidirectional, non-controlled diode. It cannot replace MOSFET-based synchronous rectifiers that require gate drive. However, it serves as a robust bootstrap or auxiliary clamp diode in synchronous designs where fast, reliable uncontrolled conduction is needed.

How does the DO-15 package affect thermal performance compared to SMB or SMC variants?

STTH3R04Q's DO-15 package has Rth(j-l) = 25 °C/W (vs. 17 °C/W for SMC), limiting power dissipation to ~1.2 W at ΔT = 30 °C. Effective thermal design requires ≥10 mm straight leads soldered to wide copper pours; it is less efficient than surface-mount variants but offers superior mechanical reliability in vibration-prone environments.

STTH3R04Q Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Box (TB)

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):: 35 ns

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

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-15

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

STTH3R04Q FAQ

1.How can I place an order for STTH3R04Q through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH3R04Q 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 STTH3R04Q reliable?

The price and inventory of STTH3R04Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH3R04Q is usually 5 days.

3.What payment methods are accepted for STTH3R04Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH3R04Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH3R04Q?

STTH3R04Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH3R04Q 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 STTH3R04Q?

For technical support, including STTH3R04Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH3R04Q requirements.

6.How does Aetrix verify that STTH3R04Q is sourced from the original manufacturer or authorized distributors?

All STTH3R04Q 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 STTH3R04Q meets industry standards.

7.What is the process for return or replacement of STTH3R04Q?

All STTH3R04Q units undergo pre-shipment inspection (PSI). If there is an issue with STTH3R04Q, 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 STTH3R04Q part is unused and in its original packaging.

Return procedure for STTH3R04Q:

1.Submit a request within 90 days.

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

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