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

STMicroelectronics STTH1210DI

Name: STTH1210DI
Brand: STMicroelectronics
SKU: STTH1210DI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1210DI

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: STTH1210DI.pdf

Description:: DIODE GP 1KV 12A TO220AC INS

Quantity:: RFQ Add To RFQ list

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Inventory:6,104

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Product details

Overview

STTH1210DI from STMicroelectronics is an ultrafast recovery, high-voltage silicon rectifier diode in an insulated TO-220 package, rated for 1000 V repetitive peak reverse voltage, 12 A average forward current at Tc = 95 °C, and 48 ns typical reverse recovery time at 125 °C. It delivers soft recovery, low conduction and switching losses, and operates reliably in industrial power supplies and motor control freewheeling circuits.

For engineers reviewing the STTH1210DI datasheet, STTH1210DI pinout, STTH1210DI application, or STTH1210DI equivalent, key selection criteria include its 2500 VRMS electrical insulation rating, 3.1 °C/W junction-to-case thermal resistance, 1.30 V typical forward voltage at 150 °C, and suitability for snubber and demagnetization functions in high-reliability systems.

Technical Context

This diode employs a planar epitaxial structure optimized for ultrafast soft recovery, minimizing voltage overshoot and EMI during turn-off. Its dynamic performance is characterized by a softness factor ≥2 at 125 °C and dIF/dt = −200 A/µs, ensuring robust operation under high di/dt conditions in inductive switching circuits.

The insulated TO-220 package provides 2500 VRMS isolation between the cathode tab and mounting surface, with 7 pF junction-to-case capacitance - critical for maintaining signal integrity in isolated gate-drive or auxiliary supply paths where creepage and coupling must be tightly controlled.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - supports primary-side rectification in 800 V DC-link or 3-phase 400 V AC systems with safety margin
I_F(AV)	12 A at T_c = 95 °C - enables continuous conduction mode operation in high-power SMPS with forced-air cooling
t_rr (typ)	48 ns at T_j = 125 °C, I_F = 12 A, dI_F/dt = −200 A/µs - reduces switching loss and ringing in 100–500 kHz converters
V_F (typ)	1.30 V at T_j = 150 °C, I_F = 12 A - lowers conduction loss to ~15.6 W in high-temp environments
R_th(j-c)	3.1 °C/W - allows 142 W max power dissipation before reaching 175 °C junction limit with 25 °C heatsink
Isolation	2500 V_RMS - meets reinforced insulation requirements for Class I appliances and industrial isolators
C_j	7 pF - minimizes capacitive coupling noise in gate-drive bootstrap or feedback paths

Pinout & Package

STTH1210DI uses an insulated TO-220 package (TO-220Ins) with electrically isolated metal tab. The case is not internally connected to any semiconductor terminal - enabling direct mounting to grounded heatsinks without additional insulating hardware.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to high-side switch node or transformer secondary in freewheeling path
Cathode (Lead 2)	Output current exit point	Routes current to output capacitor or return rail; electrically isolated from tab
Tab (isolated metal surface)	Thermal interface only	Provides mechanical mounting and heat transfer; no electrical connection to die - safe for chassis-grounded heatsinks

Key Features

Feature	Design Value
Ultrafast soft recovery	Softness factor ≥2 ensures low-voltage overshoot and reduced EMI during turn-off in inductive loads
High junction temperature rating	175 °C maximum operating temperature enables use in sealed enclosures or high-ambient industrial environments
Low leakage current	≤30 µA at 125 °C prevents thermal runaway in parallel configurations or high-impedance bias networks
Insulated package	2500 V_RMS isolation eliminates need for mica washers or silicone pads in safety-critical designs
Reproducible ruggedness	Intrinsic design robustness supports surge non-repetitive forward current up to 80 A (10 ms sine)

Applications

Industrial Power Supplies

Motor Drive Freewheeling

Use Scenario: Primary-side rectification in 3 kW telecom rectifiers with active PFC front-end.

IC Role / Device Role / Timing Role: High-voltage output rectifier handling 1000 V transients and dissipating >20 W continuously.

Use Value: 48 ns t_rr and soft recovery reduce snubber losses by 35% vs. standard fast diodes, improving system efficiency above 94%.

Use Scenario: Flyback diode across 400 V DC bus in 15 kW servo drive IGBT modules.

IC Role / Device Role / Timing Role: Freewheeling path for inductive motor current during IGBT turn-off.

Use Value: 2500 V_RMS isolation allows direct heatsink mounting to chassis ground, simplifying layout and reducing parasitic inductance.

Snubber Networks

Bootstrap Supply Demagnetization

Use Scenario: RCD clamp diode in flyback converter operating at 250 kHz with 600 V reflected voltage.

IC Role / Device Role / Timing Role: Clamp energy recirculation path with minimal reverse recovery charge.

Use Value: Q_rr ≤ 2.5 µC at 125 °C limits clamp dissipation and stabilizes clamping voltage across temperature.

Use Scenario: Demagnetization diode in high-side gate driver bootstrap circuit for 600 V half-bridge.

IC Role / Device Role / Timing Role: Provides low-loss return path for bootstrap capacitor discharge during low-side conduction.

Use Value: 7 pF junction capacitance prevents shoot-through risk by limiting capacitive feedthrough into gate drive logic.

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 MUR1210CT	12 A/1000 V dual common-cathode configuration; t_rr = 60 ns (typ); no insulation	Requires external isolation for chassis-grounded heatsinks; suited for dual-output or synchronous rectification	Select when dual-diode topology or lower cost per diode is prioritized over isolation and softness
Vishay VS-12EWH10	12 A/1000 V; t_rr = 55 ns (typ); TO-247AC package; R_th(j-c) = 1.5 °C/W	Higher thermal performance but larger footprint; no built-in isolation - needs insulator kit	Select when thermal budget is tighter than space or isolation constraints, and heatsink isolation can be managed externally

Compared with MUR1210CT and VS-12EWH10, STTH1210DI uniquely integrates 2500 V_RMS isolation and soft recovery in a TO-220 footprint - eliminating insulators, reducing BOM count, and lowering EMI in compact industrial power designs.

Availability

STTH1210DI is available at Aetrix Electronics and suitable for industrial power supplies, motor control systems, snubber networks, and bootstrap supply circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STTH1210DI 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 microcontrollers, power devices, analog ICs, and sensors for industrial, automotive, and consumer markets.

The STTH series targets high-reliability rectification in mission-critical power conversion - emphasizing ruggedness, thermal stability, and dynamic performance in harsh industrial environments.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STTH1210DI is rated for 12 A average forward current at T_c = 95 °C. Exceeding this case temperature requires derating per the datasheet's IF(AV) vs. Tc curve. At T_c = 110 °C, the maximum average current drops to approximately 9.5 A to maintain junction temperature ≤175 °C.

Can STTH1210DI be used in parallel configurations?

Yes, but only with careful thermal and electrical balancing. Its low and stable reverse leakage current (≤30 µA at 125 °C) minimizes current imbalance, and matching V_F across units is recommended. Use identical heatsinking and symmetrical PCB traces to ensure even current sharing.

Does the insulated tab require thermal compound when mounted to a heatsink?

Yes - thermal compound (e.g., silicone-based grease or phase-change pad) is required between the insulated tab and heatsink to minimize thermal resistance. The 3.1 °C/W R_th(j-c) rating assumes optimal thermal interface; omitting compound increases junction temperature by 15–25 °C under full load.

How does soft recovery improve system reliability?

Soft recovery limits di/dt-induced voltage overshoot during turn-off, reducing stress on adjacent switches and passive components. With a softness factor ≥2, STTH1210DI suppresses high-frequency ringing and associated EMI, preventing false triggering of gate drivers and extending electrolytic capacitor life in high-dV/dt environments.

STTH1210DI Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1000 V

Current - Average Rectified (Io):: 12A

Voltage - Forward (Vf) (Max) @ If:: 2 V @ 12 A

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

Reverse Recovery Time (trr):: 90 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 1000 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC ins

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

STTH1210DI FAQ

1.How can I place an order for STTH1210DI through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1210DI 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 STTH1210DI reliable?

The price and inventory of STTH1210DI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1210DI is usually 5 days.

3.What payment methods are accepted for STTH1210DI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1210DI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1210DI?

STTH1210DI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1210DI 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 STTH1210DI?

For technical support, including STTH1210DI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1210DI requirements.

6.How does Aetrix verify that STTH1210DI is sourced from the original manufacturer or authorized distributors?

All STTH1210DI 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 STTH1210DI meets industry standards.

7.What is the process for return or replacement of STTH1210DI?

All STTH1210DI units undergo pre-shipment inspection (PSI). If there is an issue with STTH1210DI, 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 STTH1210DI part is unused and in its original packaging.

Return procedure for STTH1210DI:

1.Submit a request within 90 days.

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

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