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

STMicroelectronics STTH302S

Name: STTH302S
Brand: STMicroelectronics
SKU: STTH302S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH302S

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: STTH302S.pdf

Description:: DIODE GEN PURP 200V 3A SMC

Quantity:: RFQ Add To RFQ list

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Inventory:7,298

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Product details

Overview

STTH302S from STMicroelectronics is a 200 V, 3 A ultrafast recovery rectifier diode in SMC (DO-214AB) package, optimized for base-drive switching circuits and freewheeling in SMPS. It delivers low conduction loss (VF = 0.66 V @ 125°C, 3 A), negligible switching loss, and fast reverse recovery (trr = 35 ns @ 25°C), enabling high-efficiency operation in DC-DC converters and motor drive snubbers.

For engineers reviewing the STTH302S datasheet, STTH302S pinout, STTH302S application, or STTH302S equivalent, key selection criteria include its 175°C maximum junction temperature, 100 A non-repetitive surge rating, thermal resistance (Rth(j–l) = 20°C/W), and low reverse leakage (<75 µA @ 125°C).

Technical Context

The STTH302S employs ST's planar epitaxial process to achieve controlled minority-carrier lifetime, yielding ultrafast soft recovery with minimal ringing. Its dynamic behavior is characterized by trr ≤ 35 ns, tfr ≤ 70 ns, and VFP ≤ 1.6 V under standardized dIF/dt = 50 A/µs conditions.

Thermal design is supported by validated Rth(j–l) = 20°C/W and Rth(j–a) = 75°C/W (on 1 cm² FR4 PCB), with derating curves confirming 3 A average current capability at 107°C case temperature (δ = 0.5 duty cycle).

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	200 V - Withstands repetitive reverse voltage up to 200 V without breakdown, suitable for 100–120 VAC input rectification and 48 V bus clamping.
IF(AV)	3 A @ T_L = 107°C, δ = 0.5 - Sustains continuous forward current of 3 A under typical SMPS duty-cycle conditions.
VF	0.66 V @ T_j = 125°C, I_F = 3 A - Low forward drop reduces conduction loss and improves efficiency in high-frequency power stages.
trr	35 ns @ T_j = 25°C, I_F = 1 A, dI_F/dt = −50 A/µs - Enables operation up to ~3 MHz switching frequencies with minimal switching loss and EMI.
Tj(max)	175°C - Allows reliable operation in thermally constrained industrial and automotive under-hood environments.
Rth(j–l)	20°C/W - Junction-to-lead thermal resistance enables direct heatsinking via PCB copper pour or metal-core board mounting.

Pinout & Package

STTH302S is housed in an SMC (DO-214AB) surface-mount package with cathode-banded marking. The package features a single cathode terminal and a single anode terminal, designed for high-current PCB trace routing and automated reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to positive side of source (e.g., switch node in buck converter); must handle 100 A surge pulses.
Cathode	Forward current exit / reverse blocking node	Marked with band; connects to output rail or ground return; withstands 200 V reverse bias during off-state.

Key Features

Feature	Design Value
Ultrafast soft recovery	trr ≤ 35 ns with low peak reverse recovery current (I_RM ≤ 5 A @ dI_F/dt = 200 A/µs), minimizing voltage overshoot and EMI.
High-temperature operation	Rated for continuous use at T_j = 175°C, supporting compact designs without forced air cooling.
Low conduction loss	VF = 0.66 V @ 125°C/3 A reduces power dissipation to <2 W in typical 3 A applications, easing thermal management.
Robust surge capability	IFS_M = 100 A (10 ms sine half-wave) supports transient overload conditions in motor drives and PFC stages.

Applications

Switch-Mode Power Supply Freewheeling

Transistor Base Drive Clamping

Use Scenario: Used as output rectifier/freewheeling diode in 50–200 W offline flyback and forward converters.

IC Role / Device Role / Timing Role: Freewheeling path for transformer secondary current during MOSFET off-time; recovers before next switching cycle.

Use Value: 35 ns trr ensures minimal energy loss during recovery, improving overall efficiency by ≥0.5% vs. standard fast recovery diodes.

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

IC Role / Device Role / Timing Role: Fast-turn-on path to discharge stored charge and prevent device latch-up during rapid switching transitions.

Use Value: Low VFP (1.6 V) and soft recovery limit clamp voltage overshoot to <2.5 V, protecting sensitive driver ICs.

DC-DC Converter Output Rectification

Motor Drive Snubber Network

Use Scenario: Secondary-side rectifier in isolated 12 V/3 A telecom DC-DC modules operating at 300–500 kHz.

IC Role / Device Role / Timing Role: Conducts continuous forward current while blocking reverse voltage during synchronous rectifier dead time.

Use Value: 3 A average rating and 20°C/W Rth(j–l) allow full-load operation on 2 oz copper without heatsink.

Use Scenario: Snubber diode in IGBT-based 3-phase inverter leg for HVAC compressors and industrial pumps.

IC Role / Device Role / Timing Role: Absorbs inductive kickback energy during IGBT turn-off, limiting dv/dt stress on switching devices.

Use Value: 100 A IFSM rating handles repetitive motor stall currents; 175°C Tj(max) sustains reliability in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L02	Same 200 V/3 A rating but in smaller SOD-123FL package; higher VF (0.85 V @ 125°C) and slower trr (50 ns).	Lower power density; unsuitable for >200 kHz operation or high ambient temperature (>105°C).	Select when board space is critical and thermal budget allows higher VF penalty.
ES3D	3 A/200 V in SMA package; trr = 35 ns but Tj(max) = 150°C and Rth(j–l) = 25°C/W.	Reduced thermal margin limits sustained 3 A operation above 85°C ambient without heatsinking.	Select for cost-sensitive consumer applications where 150°C junction limit is acceptable.

Compared with STTH3L02 and ES3D, the STTH302S provides superior thermal robustness (175°C Tj, 20°C/W Rth), lower VF at high temperature, and identical trr-making it optimal for industrial-grade power supplies requiring long-term reliability under thermal stress.

Availability

STTH302S is available at Aetrix Electronics and suitable for switch-mode power supplies, motor drive snubbers, and transistor base-clamp circuits requiring stable component supply, extended temperature operation, and repeatable ultrafast recovery performance.

Supply support for STTH302S 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 industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion, with the STTH302S specifically engineered for ultrafast switching applications demanding low loss, soft recovery, and high-temperature resilience in compact SMC packages.

FAQ

What is the maximum allowable case temperature for continuous 3 A operation?

The STTH302S supports IF(AV) = 3 A at TL = 107°C with 0.5 duty cycle, per datasheet Fig. 2. For continuous DC operation, derate to ≤2.2 A at 107°C case temperature. Thermal design must ensure junction temperature remains ≤175°C using Rth(j–l) = 20°C/W and measured lead temperature.

Is the STTH302S suitable for synchronous rectification replacement?

No-the STTH302S is a unidirectional ultrafast rectifier, not a synchronous MOSFET. It lacks gate control and cannot be actively switched. It serves as a passive freewheeling or clamp element; synchronous rectification requires a logic-level N-channel MOSFET with gate driver coordination.

How does reverse recovery behavior change at elevated junction temperature?

Per Fig. 9, trr increases ~1.8× and QRR rises ~2.2× as Tj rises from 25°C to 125°C. At 125°C, trr ≈ 63 ns and QRR ≈ 22 nC (vs. 35 ns / 10 nC at 25°C), requiring adjusted snubber sizing and EMI filtering in high-temperature designs.

Can the STTH302S be used in AC line input bridge configurations?

No-its VRRM = 200 V is insufficient for universal AC input (up to 375 V peak). It is rated for DC-DC secondary-side use, low-voltage AC-DC outputs (e.g., 24 V/48 V), or clamping in sub-200 V DC systems. For AC input rectification, select ≥600 V diodes such as STTH8R06.

STTH302S Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: SMC

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

STTH302S FAQ

1.How can I place an order for STTH302S through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH302S 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 STTH302S reliable?

The price and inventory of STTH302S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH302S is usually 5 days.

3.What payment methods are accepted for STTH302S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH302S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH302S?

STTH302S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH302S 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 STTH302S?

For technical support, including STTH302S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH302S requirements.

6.How does Aetrix verify that STTH302S is sourced from the original manufacturer or authorized distributors?

All STTH302S 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 STTH302S meets industry standards.

7.What is the process for return or replacement of STTH302S?

All STTH302S units undergo pre-shipment inspection (PSI). If there is an issue with STTH302S, 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 STTH302S part is unused and in its original packaging.

Return procedure for STTH302S:

1.Submit a request within 90 days.

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

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