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

STMicroelectronics STTH20R04G

Name: STTH20R04G
Brand: STMicroelectronics
SKU: STTH20R04G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH20R04G

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: STTH20R04G.pdf

Description:: DIODE GEN PURP 400V 20A D2PAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STTH20R04G from STMicroelectronics is an ultrafast recovery power rectifier optimized for clamping in plasma display panel (PDP) energy recovery circuits, featuring 20 A average forward current, 400 V repetitive peak reverse voltage, 18 ns typical reverse recovery time, 1.15 V typical forward voltage at 125 °C, and TO-220FPAC insulated package with 2000 VRMS isolation.

For engineers reviewing the STTH20R04G datasheet, STTH20R04G pinout, STTH20R04G application, or STTH20R04G equivalent, this device is selected for high-efficiency, high-surge, low-leakage rectification in fast-switching PDP power stages where thermal robustness (Tj max = 175 °C) and soft recovery (Sfactor = 0.3) reduce EMI and switching losses.

Technical Context

This rectifier employs a planar epitaxial silicon structure engineered to balance low VF (1.15 V typ. @ 125 °C) against ultrafast trr (18 ns typ. @ 25 °C), enabling efficient energy recovery in resonant clamp topologies. Its soft recovery behavior (Sfactor = 0.3) minimizes voltage overshoot and di/dt-induced ringing during turn-off.

The TO-220FPAC package provides electrical insulation (2000 VRMS) and thermal resistance of 5 °C/W (junction-to-case), supporting operation up to 105 °C case temperature with 20 A DC conduction and 150 A non-repetitive surge capability (tp = 10 ms).

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	20 A - Sustained DC output current capacity for continuous clamping duty in PDP sustain circuits.
VRRM	400 V - Maximum repetitive reverse blocking voltage, suitable for 300–400 V bus applications with safety margin.
trr (typ.)	18 ns - Ultrafast reverse recovery enables >1 MHz switching in resonant energy recovery without excessive loss or noise.
VF (typ.)	1.15 V @ Tj = 125 °C - Low forward drop reduces conduction loss (P ≈ 1.05×IF(AV) + 0.015×IF²(RMS)) at elevated temperatures.
Tj (max.)	175 °C - High junction temperature rating supports compact heatsinking and reliable operation under transient overload.
IRM (typ.)	8 A @ dIF/dt = −200 A/µs - Controlled peak reverse recovery current limits stress on driving switches and snubbers.
Sfactor	0.3 - Soft recovery characteristic suppresses voltage spikes and EMI during turn-off in high-dI/dt environments.

Pinout & Package

TO-220FPAC package: insulated plastic housing with metal tab (cathode-connected), 3-pin vertical mounting configuration, 2000 VRMS isolation between tab and leads, recommended torque 0.55 N·m.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry	Connected to switching node (e.g., half-bridge leg) during energy transfer phase.
Cathode (Lead 2)	Output current exit	Connected to clamp capacitor or return path; electrically tied to insulated metal tab.
Tab (Cathode)	Thermal & electrical cathode terminal	Provides primary heat dissipation path and must be isolated from chassis ground per 2000 VRMS rating.

Key Features

Feature	Design Value
Ultrafast recovery	18 ns trr enables high-frequency (>500 kHz) energy recovery with minimal switching loss and EMI.
Insulated TO-220FPAC	2000 VRMS isolation allows direct mounting to grounded heatsinks without additional insulators.
High surge capability	150 A IFSM (10 ms sine) withstands repeated PDP sustain pulse overloads without degradation.
Low leakage current	20 µA IR @ 25 °C ensures minimal standby power loss in high-impedance clamp networks.
ECOPACK®2 compliance	Meets RoHS and halogen-free requirements for industrial and consumer display manufacturing.

Applications

Plasma Display Panel (PDP) Energy Recovery

Industrial DC-DC Clamp Circuits

Use Scenario: Recovers inductive energy from sustain electrode drivers during each AC half-cycle in large-screen PDP TVs.

IC Role / Device Role / Timing Role: Ultrafast clamping diode in resonant LC recovery loop, conducting only during switch-off transition.

Use Value: Reduces power loss by >30% vs. standard fast recovery diodes due to 18 ns trr and soft recovery (Sfactor = 0.3).

Use Scenario: Clamp voltage spikes in high-current flyback or forward converters used in factory automation power supplies.

IC Role / Device Role / Timing Role: Snubber diode absorbing leakage inductance energy during MOSFET turn-off.

Use Value: Enables 20 A continuous clamping at 400 V with 175 °C junction rating, eliminating thermal derating in enclosed enclosures.

LED Driver Flyback Snubber

Uninterruptible Power Supply (UPS) Hold-up Stage

Use Scenario: Suppresses voltage overshoot across primary-side MOSFETs in high-power LED drivers for stadium lighting.

IC Role / Device Role / Timing Role: Fast-recovery clamp diode in RCD snubber network, operating at 100–300 kHz.

Use Value: 1.15 V VF at 125 °C lowers conduction loss versus Schottky alternatives while maintaining 400 V blocking.

Use Scenario: Recovers stored energy from transformer leakage in double-conversion UPS inverters during line-to-battery transfer.

IC Role / Device Role / Timing Role: High-surge rectifier in auxiliary energy recovery path, handling 150 A transient currents.

Use Value: 150 A IFSM rating ensures reliability during grid-failure transients without fuse coordination issues.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH20L04D	Lower VF (1.05 V typ. @ 125 °C) but slower trr (35 ns typ.), TO-220AC (non-insulated) package.	Requires insulating washer for heatsink mounting; better for cost-sensitive, lower-frequency (<200 kHz) designs.	Select when lowest conduction loss dominates over EMI control and isolation is managed externally.
IXYS MUR2040CT	Dual common-cathode configuration, 400 V VRRM, 35 ns trr, TO-220AB package; no insulation rating.	Supports dual-phase clamp or synchronous rectification; lacks 2000 VRMS isolation for direct heatsink mounting.	Choose for space-constrained dual-diode layouts where isolation is handled at board level.

Compared with STTH20R04G, STTH20L04D trades recovery speed for lower VF in non-isolated mounts, while IXYS MUR2040CT offers dual topology flexibility at the expense of insulation and softness-making STTH20R04G optimal for insulated, EMI-sensitive PDP and industrial clamp designs.

Availability

STTH20R04G is available at Aetrix Electronics and suitable for plasma display panel (PDP) energy recovery, industrial DC-DC clamp circuits, and LED driver flyback snubbers requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for STTH20R04G 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

STTH20R04G belongs to ST's high-voltage ultrafast rectifier product line, engineered specifically for energy recovery and clamping in high-frequency, high-surge display and industrial power systems.

FAQ

What is the maximum case temperature for STTH20R04G in TO-220FPAC package?

The STTH20R04G in TO-220FPAC is rated for TC = 105 °C maximum case temperature under 20 A DC forward current conditions. This limit ensures safe operation within its 5 °C/W junction-to-case thermal resistance and 175 °C maximum junction temperature specification.

Does STTH20R04G require external insulation when mounted to a metal heatsink?

No - the TO-220FPAC package provides 2000 VRMS insulation between the cathode-connected metal tab and all leads, allowing direct mounting to grounded heatsinks without mica washers or insulating pads, simplifying thermal design and reducing assembly cost.

How does the softness factor (Sfactor = 0.3) affect circuit performance?

A softness factor of 0.3 indicates controlled, gradual current decay during reverse recovery, reducing di/dt-induced voltage overshoot and electromagnetic interference. This enables cleaner switching waveforms in PDP sustain drivers and eliminates need for aggressive RC snubbers.

Can STTH20R04G replace standard FR-type rectifiers in existing 400 V designs?

Yes - with identical 400 V VRRM and 20 A IF(AV), STTH20R04G offers superior performance over FR-type diodes: 18 ns trr vs. >50 ns, 1.15 V VF vs. >1.3 V, and soft recovery. However, verify layout clearance for TO-220FPAC insulation and thermal interface compatibility before drop-in replacement.

STTH20R04G Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 20A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 20 A

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

Reverse Recovery Time (trr):: 45 ns

Current - Reverse Leakage @ Vr:: 20 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

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

STTH20R04G FAQ

1.How can I place an order for STTH20R04G through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH20R04G 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 STTH20R04G reliable?

The price and inventory of STTH20R04G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH20R04G is usually 5 days.

3.What payment methods are accepted for STTH20R04G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH20R04G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH20R04G?

STTH20R04G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH20R04G 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 STTH20R04G?

For technical support, including STTH20R04G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH20R04G requirements.

6.How does Aetrix verify that STTH20R04G is sourced from the original manufacturer or authorized distributors?

All STTH20R04G 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 STTH20R04G meets industry standards.

7.What is the process for return or replacement of STTH20R04G?

All STTH20R04G units undergo pre-shipment inspection (PSI). If there is an issue with STTH20R04G, 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 STTH20R04G part is unused and in its original packaging.

Return procedure for STTH20R04G:

1.Submit a request within 90 days.

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

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