Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics STTH40P03ST

Name: STTH40P03ST
Brand: STMicroelectronics
SKU: STTH40P03ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STTH40P03ST

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-220-3

Datasheet:: STTH40P03ST.pdf

Description:: DIODE GEN PURP 300V 40A TO220

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,911

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

STTH40P03ST from STMicroelectronics is an ultrafast recovery power rectifier optimized for energy recovery circuits in plasma display panel (PDP) systems. It delivers 40 A average forward current, 300 V repetitive peak reverse voltage, and 1.15 V typical forward voltage at 40 A and 125°C, with soft recovery (Sfactor = 0.5) and 175°C maximum junction temperature.

For engineers reviewing the STTH40P03ST datasheet, STTH40P03ST pinout, STTH40P03ST application, or STTH40P03ST equivalent, key selection criteria include ultrafast reverse recovery time (t_rr ≤ 60 ns at dI_F/dt = 1000 A/µs), low conduction loss (P = 0.88×I_F(AV) + 0.0135×I_F(RMS)²), and TO-220AB package thermal resistance (R_th(j-c) = 1.15 °C/W).

Technical Context

This diode implements a planar epitaxial ultrafast recovery structure with controlled minority-carrier lifetime to achieve soft, noise-free switching and minimal charge evacuation time (t_clamp) during inductive energy recovery cycles. Its 0.5 softness factor and 5–6.5 A peak reverse recovery current (I_RM) at 100°C enable stable operation under high dI_F/dt transients up to 1000 A/µs.

The device is specifically engineered for PDP sustain driver circuits where rapid, low-loss commutation between high-voltage sustain pulses is critical. Its 175°C T_j(max) and low thermal resistance support high-power density layouts without forced air cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	300 V - Withstands repetitive 300 V reverse bias in PDP sustain phase without breakdown
I_F(AV)	40 A - Sustains continuous 40 A forward current in energy recovery path at T_c ≤ 100°C
V_F (typ)	1.15 V @ 40 A, 125°C - Low conduction drop minimizes I²R losses in high-current sustain discharge
t_rr (max)	60 ns @ dI_F/dt = 1000 A/µs - Enables >1 MHz switching in resonant recovery topologies
Sfactor	0.5 - Soft recovery reduces EMI and voltage overshoot during turn-off in inductive loads
R_th(j-c)	1.15 °C/W (TO-220AB) - Enables efficient heat transfer to heatsink in compact PDP module designs
I_RM (typ)	5 A @ 100°C, 100 V - Predictable reverse current aids snubber design and stress analysis

Pinout & Package

STTH40P03ST is housed in a TO-220AB package with isolated tab (electrically connected to cathode), standard 3-pin configuration, and screw-mount thermal interface. Pin 1 = Anode, Pin 2 = Cathode (tab), Pin 3 = Cathode (lead). Mounting torque: 0.55 m·N (max 0.70 m·N).

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input terminal for forward conduction path	Connects to PDP sustain capacitor bank positive node during energy transfer phase
Cathode (Tab & Lead 2/3)	Output terminal and thermal interface	Electrically common cathode node; tab provides primary thermal path to heatsink
Isolated Tab	Thermal and electrical connection point	Electrically tied to cathode; requires insulating washer if heatsink is grounded

Key Features

Feature	Design Value
Ultrafast recovery	t_rr ≤ 60 ns enables >1 MHz PDP sustain frequency without excessive switching loss
Soft recovery (Sfactor = 0.5)	Reduces EMI generation and voltage ringing during turn-off in high-dI/dt PDP circuits
High surge capability	120 A repetitive peak forward current supports transient overloads during panel ignition
175°C junction rating	Allows operation in thermally constrained PDP module environments without derating
Low conduction loss model	P = 0.88×I_F(AV) + 0.0135×I_F(RMS)² enables accurate thermal budgeting

Applications

Plasma Display Panel (PDP) Energy Recovery

PDP Sustain Driver Output Stage

Use Scenario: Recovers inductive energy stored in sustain transformer during each half-cycle of AC sustain waveform.

IC Role / Device Role / Timing Role: Ultrafast power rectifier in resonant recovery loop, conducting only during energy transfer phase.

Use Value: Reduces total power loss by minimizing t_clamp and reverse recovery charge, directly improving luminous efficiency.

Use Scenario: Positioned at output of H-bridge sustain driver to clamp and redirect flyback energy.

IC Role / Device Role / Timing Role: Bidirectional clamping diode enabling zero-voltage switching transitions.

Use Value: Soft recovery suppresses voltage spikes that would otherwise degrade gate drivers and MOSFETs.

High-Frequency Inductive Power Transfer

Industrial DC-DC Resonant Converters

Use Scenario: Used in kHz-range resonant converters requiring fast, low-loss unidirectional current control.

IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement in LLC topologies.

Use Value: 1.15 V V_F at 40 A lowers conduction loss vs. Schottky alternatives above 100 V.

Use Scenario: Energy recovery diode in high-efficiency industrial DC-DC modules for factory automation.

IC Role / Device Role / Timing Role: Fast-recovery path for leakage inductance energy in forward or flyback converters.

Use Value: 175°C T_j(max) and 1.15 °C/W R_th(j-c) support 24/7 operation without thermal throttling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH30L06D	600 V V_RRM, 30 A I_F(AV), TO-220AC package, higher V_F (1.7 V @ 30 A)	Higher voltage rating suits 400–600 V bus systems but lower current capacity limits PDP use	Select when system reverse voltage exceeds 300 V and average current ≤ 30 A
IXYS MUR460E	600 V V_RRM, 4 A I_F(AV), TO-220AC, faster t_rr (35 ns) but lower current rating	Insufficient I_F(AV) for PDP main energy recovery; suitable only for auxiliary snubbers	Use only in low-current, high-dI/dt auxiliary paths-not as direct STTH40P03ST replacement

Compared with STTH30L06D and IXYS MUR460E, STTH40P03ST uniquely balances 40 A current handling, 300 V rating, and soft ultrafast recovery-making it purpose-fit for PDP sustain energy recovery where both current and EMI constraints are simultaneously critical.

Availability

STTH40P03ST is available at Aetrix Electronics and suitable for plasma display panel (PDP) energy recovery circuits, industrial resonant DC-DC converters, and high-frequency inductive power transfer systems requiring stable component supply and long-term manufacturability.

Supply support for STTH40P03ST 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 industrial, automotive, and consumer markets.

STTH40P03ST belongs to ST's Ultrafast Power Rectifier product line, engineered specifically for high-efficiency energy recovery in plasma display and resonant converter applications where soft switching and thermal robustness are essential.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STTH40P03ST supports continuous operation with case temperature up to 100°C when mounted on a heatsink with thermal resistance ≤ 1.15 °C/W. At T_c = 100°C and I_F(AV) = 40 A, junction temperature remains at 175°C-the absolute maximum rated value. Derating is required above this case temperature.

Does the TO-220AB package have electrically isolated tab?

Yes-the TO-220AB package used for STTH40P03ST features an electrically isolated tab connected internally to the cathode. The isolation withstands ≥ 2500 V_RMS per JEDEC standards. A thermal pad or insulating washer must be used when mounting to a grounded heatsink.

How is reverse recovery softness quantified, and why does Sfactor = 0.5 matter?

Softness factor (Sfactor) is defined as the ratio of slow-to-fast reverse recovery current decay time. An Sfactor of 0.5 indicates predominantly gradual current decay-reducing di/dt-induced voltage overshoot and EMI. In PDP sustain drivers, this prevents false triggering of protection circuits and extends MOSFET lifetime.

Can STTH40P03ST replace standard fast recovery diodes in existing PDP designs?

Yes-STTH40P03ST is a direct upgrade over older fast recovery diodes (e.g., BYV26E) in PDP energy recovery circuits. Its lower V_F, faster t_rr, and soft recovery reduce total power loss by up to 22% and eliminate snubber capacitor stress observed with hard-switching alternatives.

STTH40P03ST Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 300 V

Current - Average Rectified (Io):: 40A

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 40 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 50 µA @ 300 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

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

STTH40P03ST FAQ

1.How can I place an order for STTH40P03ST through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH40P03ST 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 STTH40P03ST reliable?

The price and inventory of STTH40P03ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH40P03ST is usually 5 days.

3.What payment methods are accepted for STTH40P03ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH40P03ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH40P03ST?

STTH40P03ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH40P03ST 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 STTH40P03ST?

For technical support, including STTH40P03ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH40P03ST requirements.

6.How does Aetrix verify that STTH40P03ST is sourced from the original manufacturer or authorized distributors?

All STTH40P03ST 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 STTH40P03ST meets industry standards.

7.What is the process for return or replacement of STTH40P03ST?

All STTH40P03ST units undergo pre-shipment inspection (PSI). If there is an issue with STTH40P03ST, 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 STTH40P03ST part is unused and in its original packaging.

Return procedure for STTH40P03ST:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…