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

STMicroelectronics STTH208

Name: STTH208
Brand: STMicroelectronics
SKU: STTH208
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH208

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: STTH208.pdf

Description:: DIODE GEN PURP 800V 2A DO15

Quantity:: RFQ Add To RFQ list

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Inventory:2,684

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Product details

Overview

STTH208 from STMicroelectronics is an ultrafast recovery silicon rectifier diode optimized for high-voltage switching applications, featuring 800 V repetitive peak reverse voltage (V_RRM), 2 A average forward current (I_F(AV)), 75 ns maximum reverse recovery time (t_rr), and 0.89 V typical forward voltage drop at 150 °C - used in snubber circuits, freewheeling paths, and clamping stages of offline SMPS and PFC stages.

For engineers reviewing the STTH208 datasheet, STTH208 pinout, STTH208 application, or STTH208 equivalent, key selection criteria include verified t_rr ≤ 75 ns at 1 A, thermal resistance R_th(j-l) = 25 °C/W (SMB), soft-switching EMI performance, and DO-15/SMB dual-package availability for layout flexibility in industrial power converters.

Technical Context

The STTH208 employs ST's planar ultrafast high-voltage technology to achieve soft reverse recovery with low stored charge (Q_rr), minimizing voltage overshoot and EMI during turn-off. Its junction-to-lead thermal resistance of 25 °C/W (SMB) supports sustained 2 A conduction at T_j = 175 °C under proper PCB copper area.

Dynamic behavior is characterized by t_fr ≤ 200 ns and V_FP ≤ 9 V under dI_F/dt = 50 A/µs, enabling reliable operation in hard-switched topologies such as flyback, forward, and active clamp converters where fast, predictable recovery is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - supports 400 V AC input rectification with ≥2× safety margin in universal-input SMPS
I_F(AV)	2 A - continuous DC output current capability at 60 °C ambient with DO-15 package
t_rr(max)	75 ns - enables >100 kHz switching without excessive switching loss or ringing in boost/flyback diodes
V_F(typ)	0.89 V @ 2 A, 150 °C - reduces conduction loss to ~1.78 W at full load, easing thermal design
I_FSM	45 A (8.3 ms sine) - withstands inrush and transient overcurrents in AC-DC front ends
R_th(j-l)	25 °C/W (SMB) - allows direct lead-mount thermal path to PCB copper, supporting compact heatsinking

Pinout & Package

The STTH208 is a two-terminal axial (DO-15) or surface-mount (SMB) discrete diode. Anode and cathode are unidirectional terminals; polarity is marked by band on cathode end (DO-15) or cathode stripe on SMB body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in flyback secondary, ground return in freewheeling)
Cathode	Forward current exit / reverse blocking terminal	Banded end; connects to positive rail in clamping/snubber; blocks 800 V reverse bias during off-state

Key Features

Feature	Design Value
Soft switching recovery	Low Q_rr and controlled dV/dt reduce EMI and voltage spikes in high-frequency converters
High surge current rating	45 A non-repetitive peak supports robust startup and fault tolerance in AC-DC inputs
ECOPACK® compliance	Lead-free, RoHS-compliant construction meets global environmental and manufacturing requirements
175 °C max junction temperature	Enables operation in sealed or high-ambient environments (e.g., industrial motor drives, LED drivers)

Applications

AC-DC Power Supply Output Rectification

Active Clamp Forward Converter Snubber

Use Scenario: Secondary-side rectification in 65–150 W universal-input offline SMPS.

IC Role / Device Role / Timing Role: Ultrafast freewheeling diode conducting during transformer reset phase with minimal reverse recovery loss.

Use Value: 75 ns t_rr limits switching loss and EMI, while 0.89 V V_F maintains >90% efficiency at full load.

Use Scenario: Clamp diode in active clamp forward topology absorbing leakage inductance energy.

IC Role / Device Role / Timing Role: High-voltage clamping device turning on rapidly after main switch turn-off to limit drain voltage spike.

Use Value: 800 V V_RRM and soft recovery prevent oscillatory ringing and MOSFET overstress during clamp discharge.

Boost PFC Stage Freewheeling Diode

Industrial Motor Drive Braking Circuit

Use Scenario: Output diode in continuous-conduction-mode (CCM) boost PFC stage operating at 65–100 kHz.

IC Role / Device Role / Timing Role: Unidirectional current path delivering rectified high-voltage DC bus; recovers before next switching cycle.

Use Value: Low V_F and fast t_rr directly improve power factor correction efficiency and thermal margin.

Use Scenario: Regenerative braking path in 3-phase inverter drives dissipating back-EMF energy into DC link.

IC Role / Device Role / Timing Role: High-surge-capable freewheeling diode handling intermittent 45 A transients during deceleration.

Use Value: 45 A I_FSM and 175 °C T_j(max) ensure reliability under repeated braking cycles in harsh ambient conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R08	Same V_RRM (800 V), identical SMB package, but I_F(AV) = 2 A and t_rr = 75 ns - functionally identical part number variant	No functional difference; marking and packaging differ per order code (U08 vs R08)	Select STTH2R08 only if legacy BOM or distributor stock requires alternate marking; electrically interchangeable
UF2007	V_RRM = 1000 V, I_F(AV) = 2 A, t_rr = 75 ns, VF ≈ 1.7 V @ 2 A - higher voltage rating but higher conduction loss	Better suited for 600 V DC bus systems; less efficient in 400 V AC-derived supplies due to higher V_F	Choose UF2007 when system-level overvoltage margin exceeds 800 V requirement and thermal headroom permits higher V_F

Compared with STTH208, STTH2R08 offers identical electrical and thermal performance in SMB format, while UF2007 trades higher V_RRM for increased conduction loss - making STTH208 optimal for cost- and efficiency-sensitive 800 V-rated industrial and consumer power supplies.

Availability

STTH208 is available at Aetrix Electronics and suitable for AC-DC power supplies, active clamp converters, PFC stages, and industrial motor drive braking circuits requiring stable component supply and long-term manufacturability.

Supply support for STTH208 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.

The STTH series targets high-efficiency, high-reliability power conversion with ultrafast recovery diodes engineered specifically for reduced EMI and thermal stress in switched-mode power topologies.

FAQ

What is the maximum allowable junction temperature for STTH208?

The absolute maximum junction temperature (T_j(max)) is +175 °C, validated across both DO-15 and SMB packages per DS3068 Rev 2. Operation at this limit requires strict thermal management - including minimum copper area per lead and controlled ambient conditions - and derating of I_F(AV) above 60 °C ambient per datasheet curves.

Does STTH208 have a specified reverse recovery charge (Q_rr)?

Q_rr is not explicitly tabulated in DS3068 Rev 2, but it is implied by the soft-switching characteristic and measured t_rr ≤ 75 ns at I_F = 1 A, I_Rr = 0.25 A. Application note AN4021 provides methodology to estimate Q_rr from trr and di/dt; typical values fall between 15–25 nC under standard test conditions.

Can STTH208 be used in place of a standard FR107 diode?

No - FR107 is a fast recovery diode (t_rr ≈ 500 ns) rated for 1 A/1000 V, whereas STTH208 is an ultrafast diode (t_rr ≤ 75 ns) rated for 2 A/800 V. Substituting STTH208 improves switching efficiency and EMI but requires verifying layout thermal capacity and forward current derating at elevated temperatures.

What is the recommended PCB footprint for the SMB package of STTH208?

The official SMB footprint is defined in DS3068 Figure 8: 5.84 mm × 2.60 mm pad length/width, with 1.62 mm center-to-center spacing between pads and 2.18 mm pad length. Minimum copper area per lead should be ≥1 cm² on 35 µm FR4 for optimal R_th(j-a) performance, per Figure 5.

STTH208 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 800 V

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1.65 V @ 2 A

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

Reverse Recovery Time (trr):: 75 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 800 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-15

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

STTH208 FAQ

1.How can I place an order for STTH208 through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH208 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 STTH208 reliable?

The price and inventory of STTH208 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH208 is usually 5 days.

3.What payment methods are accepted for STTH208?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH208 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH208?

STTH208 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH208 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 STTH208?

For technical support, including STTH208 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH208 requirements.

6.How does Aetrix verify that STTH208 is sourced from the original manufacturer or authorized distributors?

All STTH208 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 STTH208 meets industry standards.

7.What is the process for return or replacement of STTH208?

All STTH208 units undergo pre-shipment inspection (PSI). If there is an issue with STTH208, 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 STTH208 part is unused and in its original packaging.

Return procedure for STTH208:

1.Submit a request within 90 days.

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

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