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

STMicroelectronics STTH1512PI

Name: STTH1512PI
Brand: STMicroelectronics
SKU: STTH1512PI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1512PI

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DOP3I-2 Insulated (Straight Leads)

Datasheet:: STTH1512PI.pdf

Description:: DIODE GEN PURP 1.2KV 15A DOP3I

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Product details

Overview

STTH1512PI from STMicroelectronics is a 1200 V, 15 A ultrafast recovery diode in insulated DOP3I package, featuring 53 ns typical reverse recovery time (trr), 1.20 V typical forward voltage (VF) at 15 A/150 °C, and 2500 V_rms electrical insulation - optimized for high-frequency rectification and freewheeling in industrial motor drives and switch-mode power supplies.

For engineers reviewing the STTH1512PI datasheet, STTH1512PI pinout, STTH1512PI application, or STTH1512PI equivalent, this device is selected for demanding high-voltage, high-temperature rectification where soft recovery, low conduction loss, and thermal robustness (T_j = 175 °C) are critical to system reliability and EMI control.

Technical Context

This diode employs an optimized silicon epitaxial structure enabling ultrafast, soft reverse recovery with S-factor ≥1.5 at 125 °C, minimizing voltage overshoot and oscillation during turn-off in hard-switched topologies. Its low Q_rr (typ. 2.5 µC at 125 °C) and controlled dV/dt behavior support stable operation in high-dI/dt environments up to 500 A/µs.

The DOP3I package provides galvanic isolation (2500 V_rms) and low junction-to-case thermal resistance (2.0 °C/W), enabling direct mounting to heatsinks without insulating washers while maintaining creepage/clearance compliance in safety-critical 1200 V systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - supports DC bus voltages up to 850 V in 3-phase rectifiers with 1.4× safety margin.
I_F(AV)	15 A at T_c = 105 °C - continuous conduction capability under forced-air-cooled industrial heatsink conditions.
t_rr (typ)	53 ns at I_F = 1 A, dI/dt = −100 A/µs, V_R = 30 V, T_j = 25 °C - enables >100 kHz switching in PFC and auxiliary supplies.
V_F (typ)	1.20 V at I_F = 15 A, T_j = 150 °C - reduces conduction loss to ~18 W at full load, improving thermal budget in compact designs.
R_th(j–c)	2.0 °C/W - allows 75 W power dissipation with ≤150 °C temperature rise from case to junction at steady state.
I_R (max)	100 µA at V_R = V_RRM, T_j = 125 °C - ensures minimal leakage-induced thermal runaway risk in high-temperature operation.
S-factor	≥1.5 at I_F = 15 A, dI/dt = −200 A/µs, V_R = 600 V, T_j = 125 °C - suppresses voltage ringing and EMI during inductive turn-off.

Pinout & Package

DOP3I is a 3-pin insulated through-hole package with electrically isolated metal tab (2500 V_rms insulation, 12 pF capacitance), designed for direct heatsink mounting without additional insulation hardware. Pin 1 (Anode), Pin 2 (Cathode), Pin 3 (Isolated Tab / Thermal Pad).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Main current entry point; connected to high-side switching node or AC input in bridge configurations.
Pin 2	Cathode	Main current exit point; routed to DC bus capacitor or load return path.
Pin 3 (Tab)	Isolated thermal pad	Electrically floating metal surface for mechanical attachment and thermal conduction to heatsink; no circuit connection required.

Key Features

Feature	Design Value
Ultrafast soft recovery	t_rr = 53 ns with S-factor ≥1.5 - reduces switching losses and EMI in high-frequency converters without snubber circuits.
High junction temperature rating	T_j(max) = 175 °C - enables operation in sealed enclosures or high-ambient environments without derating penalties.
Insulated DOP3I package	2500 V_rms isolation, 2.0 °C/W R_th(j–c) - eliminates need for mica washers and simplifies thermal design in Class I safety systems.
Low leakage current	I_R ≤ 100 µA at 125 °C - improves long-term reliability in high-temperature rectifier applications by reducing thermal runaway risk.
High surge capability	I_FSM = 200 A (10 ms sine) - withstands inrush currents in motor drive DC links and UPS input stages.

Applications

Industrial Motor Drives

Switch-Mode Power Supplies

Use Scenario: Freewheeling path in IGBT-based 3-phase inverter stages of HVAC compressors and pump controllers.

IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode clamping inductive kickback during IGBT turn-off.

Use Value: Soft recovery (S ≥1.5) prevents voltage overshoot beyond 1200 V rating, eliminating need for RC snubbers and reducing component count.

Use Scenario: Output rectification in 1–3 kW telecom and server PSUs operating at 100–200 kHz.

IC Role / Device Role / Timing Role: High-efficiency secondary-side rectifier handling 15 A average current with minimal conduction loss.

Use Value: 1.20 V V_F at 150 °C cuts conduction loss by ~12% vs. standard fast diodes, directly improving efficiency and thermal margin.

Uninterruptible Power Supplies

Induction Heating Systems

Use Scenario: Input bridge rectification in double-conversion UPS units with 600–800 V DC bus.

IC Role / Device Role / Timing Role: Primary rectifier handling high peak line currents and transient surges.

Use Value: 200 A non-repetitive surge rating and 175 °C junction temperature ensure reliable operation during brownouts and load transients.

Use Scenario: Resonant tank rectification in 10–20 kW induction cooktops and industrial heating inverters.

IC Role / Device Role / Timing Role: High-dI/dt rectifier in series-resonant half-bridge output stage.

Use Value: 500 A/µs dI/dt capability and low Q_rr (2.5 µC) maintain zero-voltage switching integrity across wide power ranges.

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
IXYS MUR1512CT	TO-220AC dual common-cathode configuration; t_rr = 65 ns (typ); no insulation; R_th(j–c) = 1.3 °C/W.	Requires external insulation for chassis-grounded heatsinks; better thermal performance but higher EMI risk due to harder recovery.	Select when dual-diode topology is needed and isolation is handled externally; avoid in Class I safety-critical designs without added insulation.
Vishay VS-15EWH12	D²PAK package; t_rr = 55 ns (typ); V_F = 1.35 V (15 A, 125 °C); R_th(j–c) = 1.5 °C/W; no isolation.	Lower thermal resistance but lacks 2500 V_rms insulation; requires insulating pad and tighter layout for creepage.	Select for space-constrained PCBs where thermal performance outweighs isolation needs; verify creepage compliance per IEC 62368-1.

Compared with MUR1512CT and VS-15EWH12, STTH1512PI uniquely delivers integrated 2500 V_rms isolation in a single-diode TO-style package, eliminating external insulation components while maintaining competitive t_rr and thermal performance - ideal for safety-certified industrial power systems.

Availability

STTH1512PI is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, and induction heating systems requiring stable component supply, long-lifecycle assurance, and certified sourcing traceability.

Supply support for STTH1512PI 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.

This diode belongs to ST's STTH ultrafast recovery diode product line, engineered specifically for high-efficiency, high-reliability rectification in industrial power conversion systems operating at elevated temperatures and voltages.

FAQ

What is the maximum recommended mounting torque for the STTH1512PI DOP3I package?

The manufacturer specifies a recommended torque range of 0.80 N·m for the DOP3I package, with an absolute maximum of 1.0 N·m. Exceeding 1.0 N·m risks mechanical damage to the internal die attach or leadframe, potentially compromising thermal performance and long-term reliability. Use a calibrated torque screwdriver for consistent assembly.

Can STTH1512PI be used in place of a standard 1200 V fast recovery diode in a PFC boost converter?

Yes - its 53 ns t_rr (typ), soft recovery (S ≥1.5), and low Q_rr make it suitable for continuous-conduction-mode (CCM) PFC stages operating up to 200 kHz. However, verify gate driver slew rate compatibility, as faster diode turn-off may increase dV/dt stress on MOSFETs if snubber design is unchanged.

Does the DOP3I package require thermal interface material between the tab and heatsink?

Yes - although the tab is electrically isolated, thermal interface material (e.g., silicone grease or phase-change pad) is required to fill microscopic air gaps and achieve the specified R_th(j–c) = 2.0 °C/W. Omitting TIM increases effective thermal resistance by 30–50%, risking premature thermal shutdown or reduced lifetime.

How does STTH1512PI's leakage current compare to standard fast diodes at 125 °C?

At 125 °C and V_R = V_RRM, STTH1512PI exhibits ≤100 µA reverse leakage - approximately 3× lower than typical fast diodes (300–500 µA). This lower leakage directly improves thermal stability in high-temperature operation and extends mean time between failures in mission-critical rectifier applications.

STTH1512PI Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DOP3I-2 Insulated (Straight Leads)

Packaging:: Tube

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1200 V

Current - Average Rectified (Io):: 15A

Voltage - Forward (Vf) (Max) @ If:: 2.1 V @ 15 A

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

Reverse Recovery Time (trr):: 105 ns

Current - Reverse Leakage @ Vr:: 15 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DOP3I

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

STTH1512PI FAQ

1.How can I place an order for STTH1512PI through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1512PI 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 STTH1512PI reliable?

The price and inventory of STTH1512PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1512PI is usually 5 days.

3.What payment methods are accepted for STTH1512PI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1512PI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1512PI?

STTH1512PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1512PI 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 STTH1512PI?

For technical support, including STTH1512PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1512PI requirements.

6.How does Aetrix verify that STTH1512PI is sourced from the original manufacturer or authorized distributors?

All STTH1512PI 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 STTH1512PI meets industry standards.

7.What is the process for return or replacement of STTH1512PI?

All STTH1512PI units undergo pre-shipment inspection (PSI). If there is an issue with STTH1512PI, 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 STTH1512PI part is unused and in its original packaging.

Return procedure for STTH1512PI:

1.Submit a request within 90 days.

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

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