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

STMicroelectronics STTH302

Name: STTH302
Brand: STMicroelectronics
SKU: STTH302
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH302

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: STTH302.pdf

Description:: DIODE GEN PURP 200V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:4,164

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Product details

Overview

STTH302 from STMicroelectronics is a 200 V, 3 A ultrafast recovery rectifier diode in DO-201AD package, featuring 35 ns reverse recovery time (trr), 0.75 V max forward voltage at 125°C, and 175°C maximum junction temperature. It serves as a freewheeling or base-drive diode in high-frequency switching power supplies and transistor snubber circuits.

For engineers reviewing the STTH302 datasheet, STTH302 pinout, STTH302 application, or STTH302 equivalent, key selection criteria include trr ≤ 35 ns at IF = 1 A / dIF/dt = −50 A/µs, VF ≤ 0.75 V at IF = 3 A / Tj = 125°C, thermal resistance Rth(j-a) = 25 °C/W on infinite heatsink, and DO-201AD mechanical compatibility with axial-leaded PCB layouts.

Technical Context

The STTH302 employs ST's planar 200 V technology to achieve low conduction losses (VF typ. 0.66 V at 125°C, 3 A) and negligible switching losses via ultrafast recovery (trr typ. 35 ns, max 35 ns). Its junction temperature rating of 175°C enables operation in compact, high-power-density converters without derating.

Dynamic performance is characterized under controlled conditions: trr tested at IF = 1 A, dIF/dt = −50 A/µs, VR = 30 V, Tj = 25°C; VF measured with pulse width tp = 380 µs, δ < 2%; IR leakage remains ≤ 75 µA at Tj = 125°C and VR = VRRM.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	200 V - Maximum repetitive reverse blocking voltage; supports 170 VAC input rectification with margin.
IF(AV)	3 A at TI = 107°C, δ = 0.5 - Continuous DC current capability with standard duty-cycle thermal derating.
trr (max)	35 ns - Enables >1 MHz switching in SMPS output stages without excessive switching loss or EMI.
VF (max)	0.75 V at IF = 3 A, Tj = 125°C - Low conduction loss reduces heat generation in high-duty-cycle freewheeling paths.
Tj (max)	175 °C - Allows direct mounting on heatsinks or integration into thermally constrained industrial power modules.
Rth(j-a)	25 °C/W on infinite heatsink with 10 mm leads - Defines thermal path for estimating junction rise above ambient in axial-leaded layout.
IR (max)	75 µA at Tj = 125°C, VR = VRRM - Minimal leakage preserves efficiency in high-impedance bias networks and standby circuits.

Pinout & Package

DO-201AD axial-leaded package with cathode indicated by white band; lead diameter ∅D = 1.30 mm, overall length B = 25.40 mm, body diameter ∅C = 5.30 mm, and minimum right-angle bend zone of 15 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to switch node (e.g., MOSFET drain) in freewheeling configuration; must withstand IFSM = 130 A surge.
Cathode	Forward current exit / reverse blocking terminal	Marked with white band; ties to output rail or ground return; sustains full VRRM during off-state with <75 µA leakage.

Key Features

Feature	Design Value
Ultrafast recovery	trr ≤ 35 ns ensures minimal reverse recovery charge (Qrr) and reduced turn-off loss in 100–500 kHz SMPS.
High-temperature operation	Rated to Tj = 175°C enables use in sealed enclosures or near hot components without forced cooling.
Low forward voltage	VF ≤ 0.75 V @ 3 A / 125°C cuts conduction loss by ~30% vs. standard fast diodes in same package.
Robust surge handling	IFSM = 130 A (10 ms, sinusoidal) supports inrush and transient overload in AC-DC front ends.
UL94 V-0 epoxy	Flame-retardant encapsulation meets safety requirements for industrial and ITE end equipment.

Applications

Switch-Mode Power Supply Output Rectification

Transistor Base-Drive Clamping

Use Scenario: High-frequency flyback or forward converter secondary-side rectification delivering 12–48 V at up to 3 A.

IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time; recovers before next switching cycle begins.

Use Value: 35 ns trr minimizes tail current overlap with switching device, reducing total system loss and EMI generation.

Use Scenario: Clamp diode across BJT or MOSFET gate/base to suppress voltage spikes during turn-off.

IC Role / Device Role / Timing Role: Fast turn-on and sub-40 ns recovery prevent latch-up and protect driver ICs from overvoltage.

Use Value: Low VF and negligible stored charge enable rapid clamping response without adding delay or ringing.

DC-DC Converter Snubber Network

Industrial Motor Drive Freewheeling

Use Scenario: RCD snubber across power switches in isolated DC-DC modules operating at 200–500 kHz.

IC Role / Device Role / Timing Role: Recirculates snubber capacitor energy back to input or clamp rail during switch turn-off.

Use Value: Ultra-low trr prevents reverse conduction during snubber reset, maintaining energy transfer integrity.

Use Scenario: Freewheeling path for inductive loads in 24–48 V brushless DC motor control H-bridges.

IC Role / Device Role / Timing Role: Provides low-loss current path when PWM-driven half-bridge transistors are off.

Use Value: 175°C Tj rating allows direct PCB mounting near motor drivers without thermal isolation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2L06	600 V VRRM, 2 A IF(AV), trr = 35 ns, DO-204AL (DO-41)	Higher voltage rating but lower current; smaller package limits thermal mass and heatsinking.	Select when 600 V blocking is required and average current ≤ 2 A; verify lead thermal relief for 175°C operation.
ES3D	200 V VRRM, 3 A IF(AV), trr = 35 ns, DO-204AL (DO-41), VF = 0.85 V (max)	Same voltage/current ratings but higher VF increases conduction loss by ~13% at full load.	Acceptable where cost sensitivity outweighs 0.1 V VF penalty; not recommended for thermally constrained 100% duty-cycle use.

Compared with STTH2L06 and ES3D, the STTH302 uniquely combines 200 V/3 A rating, 35 ns trr, and DO-201AD mechanical robustness with 175°C junction capability-making it optimal for space-constrained, high-reliability industrial power stages requiring stable thermal performance.

Availability

STTH302 is available at Aetrix Electronics and suitable for high-frequency switch-mode power supplies, transistor base-drive protection circuits, and industrial DC-DC converter freewheeling paths requiring stable component supply and long-term manufacturability.

Supply support for STTH302 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 automotive, industrial, and consumer markets.

The STTH series targets high-efficiency power conversion, with the STTH302 optimized for ultrafast switching in compact, thermally demanding power supply topologies using planar silicon technology.

FAQ

What is the maximum allowable peak forward surge current for STTH302?

The STTH302 supports a non-repetitive forward surge current (IFSM) of 130 A for 10 ms under sinusoidal waveform conditions. This rating applies only to single-event transients such as inrush or short-circuit recovery; repeated surges require derating per thermal time constants shown in Figure 4 of the datasheet.

Can STTH302 be used in place of a standard fast recovery diode in a 100 kHz PFC circuit?

No-STTH302 is not rated for continuous conduction mode (CCM) PFC applications. Its 3 A average current rating and thermal resistance assume δ = 0.5 duty cycle; PFC diodes require higher IF(AV), lower Qrr, and often TO-220 packaging for sustained 50–100 kHz operation with high RMS current.

How does junction-to-ambient thermal resistance change with PCB copper area?

Rth(j-a) = 25 °C/W is specified on an infinite heatsink with 10 mm leads. On standard FR4 PCBs, Rth(j-a) rises significantly: Figure 2 shows IF(AV) drops to ~1.8 A at Tamb = 70°C with δ = 0.5, implying effective Rth(j-a) ≈ 55–60 °C/W in typical 2-layer board layouts without added copper pour.

Is the white band on STTH302 the anode or cathode indicator?

The white band marks the cathode terminal. This matches industry-standard DO-201AD polarity marking and aligns with the device's unidirectional conduction: forward current flows from unmarked (anode) end to banded (cathode) end, with reverse blocking applied across that polarity.

STTH302 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Cut Tape (CT)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 3 A

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

Reverse Recovery Time (trr):: 35 ns

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

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

STTH302 FAQ

1.How can I place an order for STTH302 through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH302 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 STTH302 reliable?

The price and inventory of STTH302 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH302 is usually 5 days.

3.What payment methods are accepted for STTH302?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH302 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH302?

STTH302 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH302 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 STTH302?

For technical support, including STTH302 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH302 requirements.

6.How does Aetrix verify that STTH302 is sourced from the original manufacturer or authorized distributors?

All STTH302 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 STTH302 meets industry standards.

7.What is the process for return or replacement of STTH302?

All STTH302 units undergo pre-shipment inspection (PSI). If there is an issue with STTH302, 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 STTH302 part is unused and in its original packaging.

Return procedure for STTH302:

1.Submit a request within 90 days.

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

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