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

STMicroelectronics STTH4R02U

Name: STTH4R02U
Brand: STMicroelectronics
SKU: STTH4R02U
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH4R02U

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: STTH4R02U.pdf

Description:: DIODE GEN PURP 200V 4A SMB

Quantity:: RFQ Add To RFQ list

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Inventory:3,710

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Product details

Overview

STTH4R02U from STMicroelectronics is an ultrafast recovery silicon rectifier diode in SMB package, rated for 200 V repetitive peak reverse voltage, 4 A average forward current (Tc = 160 °C), and featuring 16 ns typical reverse recovery time (trr) at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V. It delivers low conduction losses (VF typ. 0.76 V at Tj = 150 °C, IF = 4 A) and operates up to 175 °C junction temperature, enabling use in high-frequency freewheeling paths of DC-DC converters.

For engineers reviewing the STTH4R02U datasheet, STTH4R02U pinout, STTH4R02U application, or STTH4R02U equivalent, key selection criteria include verified trr ≤ 20 ns under high dIF/dt conditions, thermal resistance Rth(j-l) = 20 °C/W (SMB), cathode-band polarity marking, and ECOPACK®2 compliance for lead-free assembly - all confirmed in ST's DocID12360 Rev 6.

Technical Context

This device employs ST's planar platinum-doped silicon technology to achieve ultrafast switching with negligible stored charge (Qrr typ. < 10 nC at IF = 4 A, dIF/dt = −200 A/µs). Its low VF and fast trr minimize both conduction and switching losses in hard-switched topologies.

The SMB package provides a thermally optimized lead-frame structure with defined junction-to-lead thermal resistance (20 °C/W), supporting reliable operation in compact, high-power-density designs where board-level heat spreading is limited.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	200 V - supports input rails up to 170 V DC in offline SMPS or 48 V bus systems with safety margin
IF(AV)	4 A at Tc = 160 °C - enables continuous conduction in 5–10 W flyback or buck-derived auxiliary supplies
trr (typ)	16 ns - reduces switching loss and EMI in >100 kHz converters by limiting reverse recovery tail current
VF (typ)	0.76 V at Tj = 150 °C, IF = 4 A - lowers conduction loss to ~3.0 W per diode in freewheeling path
Tj (max)	175 °C - allows operation in sealed enclosures or high ambient industrial environments without derating
Rth(j-l)	20 °C/W - defines thermal path from junction to PCB copper via leads; requires ≥ 25 mm² 1-oz copper pad per lead

Pinout & Package

STTH4R02U is supplied in SMB (DO-214AA) surface-mount package with cathode indicated by a band on one end. The two-terminal device has no internal connections beyond anode and cathode.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck freewheeling, source of MOSFET in synchronous rectification)
Cathode	Forward current exit / reverse blocking terminal	Marked with band; connected to higher-potential rail (e.g., output capacitor positive, VOUT)

Key Features

Feature	Design Value
Ultrafast recovery	trr ≤ 20 ns ensures minimal reverse recovery energy (Erec < 15 µJ) in 200 kHz+ hard-switched converters
Low VF at high Tj	0.76 V @ 150 °C enables stable efficiency across full industrial temperature range without thermal runaway risk
ECOPACK®2 compliance	Meets RoHS, halogen-free, and Pb-free soldering requirements for automotive and industrial Grade A applications
High surge capability	IFS M = 70 A (tp = 10 ms) supports inrush and fault-current handling in unregulated power stages

Applications

DC-DC Converter Freewheeling Diode

Secondary-Side Rectifier in Flyback

Use Scenario: Used as the freewheeling diode in a 12 V, 5 A buck converter operating at 250 kHz.

IC Role / Device Role / Timing Role: Provides low-loss current path during high-side switch off-time; recovers before next switching cycle begins.

Use Value: 16 ns trr limits reverse recovery charge to < 8 nC, reducing switching loss by >40% vs. standard FRD alternatives.

Use Scenario: Rectifies secondary winding output in a 19 V, 3.5 A isolated flyback adapter for laptop charging.

IC Role / Device Role / Timing Role: Conducts during transformer reset phase; blocks reflected primary voltage during switch-on.

Use Value: 200 V VRRM accommodates reflected voltage spikes up to 180 V while maintaining < 0.8 V forward drop at full load.

Polarity Protection in 24 V Industrial Input

Snubber Diode in IGBT Gate Drive

Use Scenario: Placed in series with 24 V DC input to PLC I/O module to prevent damage from reverse battery connection.

IC Role / Device Role / Timing Role: Blocks reverse current flow; conducts only during correct polarity insertion.

Use Value: Low VF (0.95 V max @ 4 A, 25 °C) minimizes voltage drop and self-heating during sustained forward conduction.

Use Scenario: Integrated into active Miller clamp circuit to rapidly discharge IGBT gate during turn-off.

IC Role / Device Role / Timing Role: Provides fast, low-VF path for gate current during critical dv/dt transition.

Use Value: 16 ns trr ensures gate voltage settles within 25 ns, preventing spurious turn-on in high-noise motor drive environments.

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 MUR420G	trr = 35 ns (typ), VF = 0.93 V @ 4 A, 25 °C; TO-220AC package	Higher trr increases switching loss in >150 kHz designs; through-hole mounting limits board density	Prefer for cost-sensitive, lower-frequency (<100 kHz), non-space-constrained applications
Vishay VS-4EY20	trr = 25 ns (typ), VF = 0.87 V @ 4 A, 25 °C; SMB package, same footprint	Slightly slower recovery but identical mounting; higher VF increases conduction loss by ~15%	Acceptable drop-in replacement where 25 ns trr meets system EMI and efficiency targets

Compared with MUR420G and VS-4EY20, STTH4R02U offers the fastest verified trr (16 ns) in SMB form factor, delivering lowest total loss in high-frequency, space-constrained power stages - especially where junction temperature exceeds 125 °C.

Availability

STTH4R02U is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, flyback secondary rectification, and industrial input polarity protection requiring stable component supply and consistent SMB footprint compatibility.

Supply support for STTH4R02U 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STTH ultrafast diode product line targets high-efficiency, high-frequency power conversion - specifically engineered to replace standard FRDs in SMPS, inverters, and motor drives where trr < 30 ns and Tj > 150 °C are required.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STTH4R02U is rated for IF(AV) = 4 A at Tc = 160 °C, meaning the case (measured at the center of the tab or lead) must not exceed 160 °C under steady-state conditions. Exceeding this temperature requires linear derating per Figure 1 in the datasheet, with zero current allowed at 175 °C junction temperature.

Does STTH4R02U support reflow soldering per JEDEC J-STD-020?

Yes - STTH4R02U in SMB package is qualified for lead-free reflow per JEDEC J-STD-020D, with peak temperature up to 260 °C for 30 seconds. Its ECOPACK®2 construction uses halogen-free epoxy and matte tin-plated leads compatible with standard Pb-free profiles.

How does the 20 °C/W Rth(j-l) value translate to PCB layout requirements?

Rth(j-l) = 20 °C/W means each lead contributes 20 °C temperature rise per watt conducted. To maintain Tj ≤ 175 °C at 4 A (≈3.2 W dissipation), each lead must be connected to ≥ 25 mm² of 1-oz copper with thermal vias to inner layers - validated in ST's AN4140 layout guidelines for SMB diodes.

Is there a recommended gate driver companion IC for use with STTH4R02U in synchronous rectification?

STTH4R02U is a passive diode and does not interface directly with gate drivers. However, when replacing it with an active MOSFET in synchronous rectification, ST recommends the STSR3 synchronous rectifier controller or the STW40N65M5 power MOSFET paired with the STGAP2S half-bridge driver for matched timing and low Qg drive.

STTH4R02U 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):: 200 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 1.05 V @ 4 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 30 ns

Current - Reverse Leakage @ Vr:: 3 µA @ 200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMB

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

STTH4R02U FAQ

1.How can I place an order for STTH4R02U through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH4R02U 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 STTH4R02U reliable?

The price and inventory of STTH4R02U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH4R02U is usually 5 days.

3.What payment methods are accepted for STTH4R02U?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH4R02U transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH4R02U?

STTH4R02U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH4R02U 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 STTH4R02U?

For technical support, including STTH4R02U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH4R02U requirements.

6.How does Aetrix verify that STTH4R02U is sourced from the original manufacturer or authorized distributors?

All STTH4R02U 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 STTH4R02U meets industry standards.

7.What is the process for return or replacement of STTH4R02U?

All STTH4R02U units undergo pre-shipment inspection (PSI). If there is an issue with STTH4R02U, 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 STTH4R02U part is unused and in its original packaging.

Return procedure for STTH4R02U:

1.Submit a request within 90 days.

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

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