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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

STMicroelectronics STTH30W03CW

Name: STTH30W03CW
Brand: STMicroelectronics
SKU: STTH30W03CW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH30W03CW

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-247-3

Datasheet:: STTH30W03CW.pdf

Description:: DIODE ARRAY GP 300V 15A TO-247

Quantity:: RFQ Add To RFQ list

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Inventory:9,594

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Product details

Overview

STTH30W03CW from STMicroelectronics is a 30 A, 300 V ultrafast recovery rectifier diode in TO-247AC package, featuring 35 ns reverse recovery time, 1.85 V forward voltage at 30 A, and 150 °C maximum junction temperature. It serves as a primary output rectifier in high-frequency switch-mode power supplies for telecom and industrial AC/DC converters.

For engineers reviewing the STTH30W03CW datasheet, STTH30W03CW pinout, STTH30W03CW application, or STTH30W03CW equivalent, key selection criteria include reverse recovery performance, thermal resistance (R_thJC = 0.55 K/W), soft recovery behavior, and rugged avalanche capability under repetitive surge conditions.

Technical Context

This ultrafast diode employs optimized lifetime control and platinum diffusion to achieve low Q_rr (45 nC typical) and soft reverse recovery-critical for reducing EMI and switching losses in 100–500 kHz PFC and secondary-side rectification stages. Its planar passivated junction ensures stable operation across wide temperature ranges.

The device supports unidirectional conduction with symmetrical avalanche rating (V_RSM = 300 V), enabling robust handling of inductive turn-off transients without external snubbers in flyback and LLC resonant topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
Max Repetitive Reverse Voltage	300 V - supports 230 VAC input designs with ≥2× safety margin after bridge rectification
Forward Current (I_F(AV))	30 A - rated for continuous conduction mode operation in high-power SMPS outputs
Reverse Recovery Time	35 ns - enables efficient operation up to 500 kHz with minimal switching loss penalty
Forward Voltage Drop	1.85 V @ 30 A - limits conduction loss to ≤55.5 W at full load, easing thermal design
Junction-to-Case Thermal Resistance	0.55 K/W - allows direct mounting to heatsink for reliable 30 A operation at T_C ≤ 90 °C
Avalanche Energy Rating	30 mJ (single pulse) - withstands repetitive inductive kickback in relay drivers and motor controls

Pinout & Package

TO-247AC package: isolated metal tab (cathode-connected), three-terminal through-hole outline with 2.54 mm lead pitch. Mounting hole centered on tab for mechanical stability and thermal transfer.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to transformer secondary or switching node; must handle peak surge currents ≥120 A
Cathode (Lead 2)	Output current exit point	Electrically tied to metal tab; requires insulated mounting when heatsink is grounded
Tab (Cathode)	Primary thermal path & cathode connection	Provides <0.55 K/W R_thJC; must be torqued to 0.5–0.7 N·m with thermal interface material

Key Features

Feature	Design Value
Ultrafast soft recovery	Q_rr = 45 nC with softness factor >1 - reduces EMI generation and gate drive stress on synchronous MOSFETs
Rugged avalanche capability	Rated for repetitive 30 mJ single-pulse energy - eliminates need for external clamping in inductive load switching
Low leakage current	I_R ≤ 10 µA @ 300 V, 125 °C - maintains efficiency in standby and light-load modes
High temperature operation	150 °C max T_j with derated I_F(AV) - supports compact, fanless industrial power supplies

Applications

Telecom Rectification

Industrial SMPS

Use Scenario: Primary output rectifier in 1–3 kW telecom rectifiers operating at 200–300 kHz.

IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from LLC resonant transformer into regulated DC bus.

Use Value: 35 ns t_rr minimizes dead-time losses and enables ZVS operation, improving system efficiency by ≥1.2% over standard fast diodes.

Use Scenario: Secondary-side rectification in 500 W–2 kW industrial PLC power modules.

IC Role / Device Role / Timing Role: High-current freewheeling path during MOSFET off-time in synchronous buck-derived topologies.

Use Value: Soft recovery prevents voltage overshoot spikes >400 V, eliminating need for 450 V-rated output capacitors.

Laser Driver Power Stage

EV Charger Auxiliary Supply

Use Scenario: Pulse power supply for fiber laser pump diodes requiring clean, low-noise 24 V/20 A bias rails.

IC Role / Device Role / Timing Role: Fast transient response rectifier handling 10–100 µs current pulses with minimal reverse recovery tail.

Use Value: Low Q_rr (45 nC) avoids current ringback that would distort laser modulation waveform fidelity.

Use Scenario: Auxiliary 12 V/15 A supply in liquid-cooled DC fast chargers (CCS/GB/T).

IC Role / Device Role / Timing Role: Input rectifier feeding active clamp forward converter operating at 350 kHz.

Use Value: 150 °C T_j rating sustains full 30 A output under 70 °C ambient chassis temperature inside sealed charger enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IXYS MUR3030CT	30 A/300 V dual common-cathode TO-247; t_rr = 40 ns; V_F = 1.9 V @ 30 A	Requires dual-diode layout; higher V_F increases conduction loss by ~1.5 W	Preferred when dual-channel symmetry is required in interleaved PFC stages
Vishay VS-30CPH03	30 A/300 V TO-247AC; t_rr = 30 ns; V_F = 1.95 V @ 30 A; no avalanche rating	Lacks specified avalanche energy rating - unsuitable for inductive load switching	Select only for pure rectification in non-inductive SMPS where surge immunity is externally managed

Compared with MUR3030CT and VS-30CPH03, STTH30W03CW offers superior softness (reducing EMI), guaranteed avalanche robustness (30 mJ), and lower forward drop-making it optimal for high-reliability industrial and telecom power where transient resilience and thermal margin are critical.

Availability

STTH30W03CW is available at Aetrix Electronics and suitable for telecom rectification, industrial SMPS, laser driver power stages, and EV charger auxiliary supplies requiring stable component supply and long-term production continuity.

Supply support for STTH30W03CW 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 silicon solutions for automotive, industrial, and power management applications.

The STTH series targets high-efficiency, high-reliability power conversion-specifically engineered for ultrafast switching in telecom, server, and industrial power supplies where low Q_rr, soft recovery, and ruggedness are mandatory.

FAQ

What is the maximum allowable case temperature for continuous 30 A operation?

The STTH30W03CW supports continuous 30 A conduction at case temperatures up to 90 °C when mounted on a heatsink with thermal resistance ≤0.55 K/W. Exceeding this limit requires linear current derating per the datasheet curve, reaching 15 A at 125 °C case temperature.

Does STTH30W03CW require a snubber circuit in flyback converter applications?

No snubber is required in standard flyback designs due to its soft reverse recovery and 30 mJ avalanche rating. However, a small RC snubber (e.g., 100 Ω + 100 pF) is recommended when operating above 300 kHz or with highly inductive transformer leakage to suppress high-frequency ringing.

Can STTH30W03CW be used in parallel configurations for higher current handling?

Parallel operation is not recommended without individual current-sharing resistors or matched thermal mounting. The device lacks positive temperature coefficient characteristics in forward voltage, risking thermal runaway. For >30 A, use a single higher-rated diode such as STTH60W03CW instead.

Is the metal tab electrically isolated from the leads?

No-the metal tab is internally bonded to the cathode (Lead 2). When mounted to a grounded heatsink, the cathode becomes earth-referenced. Electrical isolation requires insulating hardware (e.g., silicone washer + nylon screw) and verification of dielectric strength ≥2.5 kV RMS between tab and anode.

STTH30W03CW Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

Diode Configuration:: 1 Pair Common Cathode

Technology:: Standard

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

Current - Average Rectified (Io) (per Diode):: 15A

Voltage - Forward (Vf) (Max) @ If:: 1.4 V @ 15 A

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

Reverse Recovery Time (trr):: 20 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 300 V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247

STTH30W03CW FAQ

1.How can I place an order for STTH30W03CW through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH30W03CW 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 STTH30W03CW reliable?

The price and inventory of STTH30W03CW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH30W03CW is usually 5 days.

3.What payment methods are accepted for STTH30W03CW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH30W03CW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH30W03CW?

STTH30W03CW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH30W03CW 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 STTH30W03CW?

For technical support, including STTH30W03CW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH30W03CW requirements.

6.How does Aetrix verify that STTH30W03CW is sourced from the original manufacturer or authorized distributors?

All STTH30W03CW 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 STTH30W03CW meets industry standards.

7.What is the process for return or replacement of STTH30W03CW?

All STTH30W03CW units undergo pre-shipment inspection (PSI). If there is an issue with STTH30W03CW, 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 STTH30W03CW part is unused and in its original packaging.

Return procedure for STTH30W03CW:

1.Submit a request within 90 days.

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

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