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

STMicroelectronics STTA812DIRG

Name: STTA812DIRG
Brand: STMicroelectronics
SKU: STTA812DIRG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTA812DIRG

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-220-2 Insulated, TO-220AC

Datasheet:: STTA812DIRG.pdf

Description:: DIODE GP 1.2KV 8A TO220AC INS

Quantity:: RFQ Add To RFQ list

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Inventory:7,281

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Product details

Overview

STTA812DIRG from STMicroelectronics is an ultra-fast, soft-recovery 1200 V, 8 A high-voltage diode in insulated TO-220AC package, featuring 50 ns typical reverse recovery time, 2.0 V maximum forward voltage at 8 A, and 2500 V_RMS electrical insulation. It serves as a freewheeling, snubber, clamping, or high-voltage rectifier diode in motor control and SMPS primary/secondary stages.

For engineers reviewing the STTA812DIRG datasheet, STTA812DIRG pinout, STTA812DIRG application, or STTA812DIRG equivalent, key selection criteria include softness factor (1.2), low conduction losses (V_to = 1.57 V, r_d = 54 mΩ), thermal resistance (R_th(j-c) = 3.3 °C/W), and dI/dt robustness up to –500 A/µs at 125 °C.

Technical Context

This diode employs optimized carrier lifetime control and tailored doping profiles to achieve ultra-fast turn-off with soft recovery-minimizing voltage overshoot and EMI during IGBT/MOSFET freewheeling transitions. Its softness factor of 1.2 (at 125 °C, 600 V, –500 A/µs) ensures controlled tail current decay, reducing stress on companion switches.

Designed for high-frequency, high-pulsed-current operation, it delivers stable dynamic performance across –65 °C to +150 °C junction temperature range, with validated reverse recovery behavior up to 100 ns (max) and peak reverse recovery current of 25 A under harsh dI/dt conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Withstands repetitive 1200 V reverse bias without breakdown, enabling use in 800 V DC bus SMPS and industrial motor drives.
I_F(AV)	8 A - Continuous average forward current rating at case temperature ≤ 85 °C, suitable for sustained conduction in power stage freewheel paths.
t_rr (typ)	50 ns - Ultra-short reverse recovery time minimizes switching loss overlap in hard-switched topologies operating above 50 kHz.
V_F (max)	2.0 V @ 8 A, 125 °C - Low forward drop reduces conduction loss (P₁ ≈ 19.5 W at T_c = 85 °C), critical for thermal management in compact designs.
R_th(j-c)	3.3 °C/W - Junction-to-case thermal resistance for insulated TO-220AC package, defining heatsink sizing for reliable 150 °C max junction operation.
S factor	1.2 (typ) - Softness ratio (t_b/t_a) ensures gentle current tail decay, suppressing voltage ringing and reducing EMI filter burden.
V_ISO	2500 V_RMS - Reinforced insulation enables direct mounting on live heatsinks in isolated power stages without additional barrier pads.

Pinout & Package

STTA812DIRG uses an insulated TO-220AC package with electrically isolated tab (2500 V_RMS, 7 pF capacitance). The device has two terminals: anode and cathode, mounted on opposite sides of the molded body. Mounting torque must not exceed 1.0 m·N.

Pin/Terminal	Circuit Role	Design Meaning
Anode (K)	Forward current entry point	Connected to switched node (e.g., IGBT collector or transformer primary); polarity must match freewheel path direction.
Cathode (A)	Forward current exit point	Connected to DC rail or return path; electrically isolated tab allows direct heatsink attachment without shorting to circuit ground.

Key Features

Feature	Design Value
Ultra-fast soft recovery	t_rr = 50 ns (typ), S factor = 1.2 - Enables clean turn-off with minimal voltage overshoot in IGBT co-packaged applications.
High-voltage ruggedness	V_RRM = 1200 V, V_RSM = 1200 V - Supports 800–1000 V DC link systems with margin for transient spikes.
Low conduction loss	V_to = 1.57 V, r_d = 54 mΩ - Enables accurate conduction loss modeling (P₁ = V_to·I_F(AV) + r_d·I_F(RMS)²) for thermal design.
Insulated package	2500 V_RMS isolation, 7 pF leakage capacitance - Eliminates need for insulating washers; reduces parasitic coupling in high-dV/dt environments.
High dI/dt immunity	Withstands –500 A/µs at 125 °C - Maintains stable recovery behavior under extreme switching transients in motor drive inverters.

Applications

Motor Drive Inverter Freewheeling

SMPS Primary Snubber/Clamp

Use Scenario: Used across IGBT collector-emitter in 3-phase inverter legs for regenerative energy recirculation during PWM dead-time.

IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss, soft-recovery current path during switch off-state; critical for minimizing voltage spikes and EMI.

Use Value: 1.2 softness factor and 50 ns t_rr reduce peak V_CE overshoot by >30% vs. standard fast diodes, lowering IGBT voltage derating needs.

Use Scenario: Placed across primary winding of flyback or forward converter transformers to clamp leakage inductance spikes.

IC Role / Device Role / Timing Role: Snubber diode absorbing stored energy during MOSFET turn-off; requires fast, low-capacitance, high-V_R capability.

Use Value: 2500 V_RMS isolation and 7 pF capacitance minimize capacitive coupling to heatsink, preserving snubber timing accuracy and noise immunity.

SMPS Secondary High-Voltage Rectification

Inductive Load Demagnetization

Use Scenario: Rectifying high-voltage outputs (≥600 V) in telecom or industrial SMPS secondary circuits with synchronous or quasi-resonant topology.

IC Role / Device Role / Timing Role: High-voltage output rectifier handling pulsed forward current up to 110 A peak with minimal reverse recovery loss.

Use Value: 1200 V V_RRM and 100 ns t_rr (max) support 600–800 V output rails while maintaining efficiency >92% at 100 kHz switching.

Use Scenario: Connected across solenoids, relays, or transformer primaries to safely dissipate stored magnetic energy during de-energization.

IC Role / Device Role / Timing Role: Demagnetizing diode providing controlled, low-loss discharge path; must avoid voltage reversal and oscillation.

Use Value: Soft recovery (S = 1.2) prevents current snap-off and suppresses ringing-induced contact arcing in electromechanical systems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1212D	V_RRM = 1200 V, t_rr = 60 ns (typ), non-insulated TO-220AC, R_th(j-c) = 2.3 °C/W	Lacks 2500 V_RMS isolation; requires insulating pad for heatsink mounting	Select when board layout permits insulated mounting and lower thermal resistance is prioritized over isolation.
IXYS MUR1220CT	V_RRM = 1200 V, t_rr = 75 ns (typ), dual common-cathode DPAK, no isolation	Dual-diode configuration; higher t_rr and no reinforced insulation	Choose only for cost-sensitive dual-channel designs where softness and isolation are secondary to footprint density.

Compared with STTH1212D and MUR1220CT, STTA812DIRG uniquely combines 2500 V_RMS isolation, 50 ns t_rr, and 1.2 softness in a single-diode TO-220AC Ins. package-making it optimal for space-constrained, high-reliability industrial inverters where heatsink integration and EMI control are critical.

Availability

STTA812DIRG is available at Aetrix Electronics and suitable for motor control inverters, industrial SMPS primary clamping, and high-voltage rectification requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STTA812DIRG 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.

STTA812DIRG belongs to the TURBOSWITCH family-engineered specifically for ultra-low-loss, soft-recovery operation in high-frequency, high-dI/dt power conversion systems where diode-induced switching stress limits system efficiency and reliability.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The maximum operating junction temperature is 150 °C. At T_j = 150 °C, parameters including V_F, I_R, and t_rr shift per datasheet curves-e.g., reverse leakage rises to 4 mA, and softness factor remains stable at 1.2. Thermal design must ensure R_th(j-c) + R_th(c-s) + R_th(s-a) keeps T_j ≤ 150 °C under worst-case I_F(AV) = 8 A and ambient conditions.

Can STTA812DIRG replace standard fast recovery diodes in existing IGBT modules?

Yes-provided mechanical mounting and thermal interface accommodate the insulated TO-220AC package. Its 50 ns t_rr and 1.2 softness improve switching behavior versus legacy 100+ ns diodes, but PCB layout must maintain low-inductance cathode routing and verify gate drive stability due to reduced voltage overshoot.

Is the 2500 V_RMS insulation rating certified to any safety standard?

The 2500 V_RMS isolation is verified per IEC 60747-5-2 for basic insulation in power semiconductor devices. It meets creepage/clearance requirements for reinforced insulation in Pollution Degree 2 environments, but system-level certification (e.g., UL 62368-1) requires full end-equipment validation.

How does the softness factor impact EMI in motor drive applications?

A softness factor of 1.2 indicates a longer tail current decay relative to initial reverse current peak (t_b/t_a = 1.2), which reduces dV/dt during turn-off and suppresses high-frequency ringing. This directly lowers conducted EMI in 3-phase inverter outputs, easing compliance with EN 55011 Class A limits without oversized RC snubbers.

STTA812DIRG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: TURBOSWITCH™

Package/Case:: TO-220-2 Insulated, TO-220AC

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 2.2 V @ 8 A

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

Reverse Recovery Time (trr):: 100 ns

Current - Reverse Leakage @ Vr:: 100 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC ins

Operating Temperature - Junction:: 150°C (Max)

STTA812DIRG FAQ

1.How can I place an order for STTA812DIRG through Aetrix?

Please submit a Request for Quotation (RFQ) for STTA812DIRG 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 STTA812DIRG reliable?

The price and inventory of STTA812DIRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTA812DIRG is usually 5 days.

3.What payment methods are accepted for STTA812DIRG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTA812DIRG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTA812DIRG?

STTA812DIRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTA812DIRG 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 STTA812DIRG?

For technical support, including STTA812DIRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTA812DIRG requirements.

6.How does Aetrix verify that STTA812DIRG is sourced from the original manufacturer or authorized distributors?

All STTA812DIRG 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 STTA812DIRG meets industry standards.

7.What is the process for return or replacement of STTA812DIRG?

All STTA812DIRG units undergo pre-shipment inspection (PSI). If there is an issue with STTA812DIRG, 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 STTA812DIRG part is unused and in its original packaging.

Return procedure for STTA812DIRG:

1.Submit a request within 90 days.

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

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