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

STMicroelectronics STTA212S

Name: STTA212S
Brand: STMicroelectronics
SKU: STTA212S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTA212S

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: STTA212S.pdf

Description:: DIODE GEN PURP 1.2KV 2A SMC

Quantity:: RFQ Add To RFQ list

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Inventory:3,463

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Product details

Overview

STTA212S from STMicroelectronics is an ultra-fast, soft-recovery 1200 V high-voltage power diode in SMC package, rated for 2 A average forward current and 65 ns typical reverse recovery time (t_rr), with 1.5 V max forward voltage at 2 A and 125 °C junction temperature. It is engineered for snubbing, clamping, demagnetization, and high-voltage rectification in motor control and SMPS primary/secondary stages.

For engineers reviewing the STTA212S datasheet, STTA212S pinout, STTA212S application, or STTA212S equivalent, key selection criteria include softness factor (S = 0.9), low dynamic resistance (175 mΩ), low conduction losses (P₁ = 2.5 W at δ = 0.5), and thermal resistance (R_th(j–I) = 21 °C/W), critical for high-frequency freewheeling and IGBT/MOSFET loss reduction.

Technical Context

The STTA212S employs optimized carrier lifetime control to achieve soft reverse recovery (S factor = 0.9 at dIF/dt = −50 A/µs, T_j = 125 °C) and minimize EMI generation during turn-off. Its low t_rr (65 ns typ at 25 °C) and low I_RM (6.0 A max at 125 °C) reduce switching losses in companion transistors.

Designed for high-voltage, high-dI/dt operation, it supports repetitive peak reverse voltage (V_RRM) of 1200 V and surge current (I_FSM) up to 25 A (10 ms sine), with thermal performance validated for lead-temperature-limited dissipation (P_max = 2.8 W at T_lead = 67 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Withstands repetitive reverse voltage up to 1200 V without breakdown in clamping/snubber circuits.
t_rr (typ)	65 ns - Enables high-frequency switching (>100 kHz) with minimal tail current and reduced transistor stress.
V_F (max)	1.5 V @ 2 A, 125 °C - Limits conduction loss to ≤3 W in continuous 2 A operation at elevated temperature.
S factor	0.9 - Soft recovery reduces voltage overshoot and EMI in IGBT freewheeling and SMPS demag paths.
R_th(j–I)	21 °C/W - Allows ~120 °C junction rise above lead at 2.5 W conduction loss, supporting compact heatsinking.
I_F(AV)	2 A - Rated average forward current under specified thermal conditions (δ = 0.5, T_lead = 72 °C).
I_FSM	25 A @ 10 ms sine - Handles short-duration overload events in motor drive startup or fault conditions.

Pinout & Package

STTA212S is housed in an SMC (DO-214AB) surface-mount plastic package with cathode indicated by a band. The device has two terminals: Anode (A) and Cathode (K), with no internal gating or control pins.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to positive side of load or switch node; must withstand full system voltage during reverse bias.
Cathode (K)	Forward current exit / reverse voltage reference	Marked by band; ties to ground or low-side switch node; defines polarity for clamping and freewheel paths.

Key Features

Feature	Design Value
Ultra-fast soft recovery	t_rr = 65 ns (typ), S = 0.9 - Reduces voltage spikes and EMI in high-dI/dt freewheeling applications.
Low conduction loss	V_F = 1.5 V max @ 2 A, 125 °C - Enables efficient operation in thermally constrained motor control PCBs.
High-voltage ruggedness	V_RRM = 1200 V, V_RSM = 1200 V - Supports direct use in 800 V DC bus systems with margin for transient overvoltage.
Optimized thermal path	R_th(j–I) = 21 °C/W - Facilitates reliable operation at 2.5 W dissipation with standard copper pour on FR4.

Applications

Motor Drive Freewheel Diode

SMPS Primary Snubber Diode

Use Scenario: Used across IGBT collector-emitter in 3-phase inverter legs to provide safe current recirculation during switching transitions.

IC Role / Device Role / Timing Role: Freewheeling diode enabling zero-voltage turn-on and limiting voltage overshoot during IGBT turn-off.

Use Value: Soft recovery (S = 0.9) suppresses ringing and reduces IGBT switching losses by >20% vs. standard fast diodes.

Use Scenario: Placed across primary winding of flyback or resonant converters to clamp voltage spikes during MOSFET turn-off.

IC Role / Device Role / Timing Role: Clamping diode absorbing leakage inductance energy with minimal delay and overshoot.

Use Value: 1200 V rating and 65 ns t_rr ensure reliable clamping at 400–800 V DC bus with <100 ns response.

SMPS Secondary Rectifier

Demagnetization Diode

Use Scenario: High-voltage output rectifier in offline AC-DC adapters delivering ≥24 V at >1 A into capacitive loads.

IC Role / Device Role / Timing Role: Output rectifier conducting during transformer secondary voltage polarity reversal.

Use Value: Low V_F (1.5 V max) and soft recovery maintain efficiency >88% at 100 kHz while minimizing output ripple.

Use Scenario: Connected across relay coils or solenoid drivers to dissipate stored magnetic energy when switched off.

IC Role / Device Role / Timing Role: Demagnetizing diode providing controlled discharge path for inductive kickback.

Use Value: 25 A surge rating and 1200 V V_RRM prevent failure during 100 V+ coil flyback events with fast dI/dt.

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
STTH2R012DJF	Same 1200 V V_RRM, but TO-220AC package; t_rr = 60 ns (typ), V_F = 1.45 V (max)	Requires through-hole mounting and larger heatsink; better for higher-current discrete designs	Select when board space allows TO-220 and thermal budget exceeds 3.5 W.
ES1J-M3/5AT	Lower V_RRM (600 V), smaller SMC package, t_rr = 35 ns (typ), V_F = 1.7 V (max)	Not suitable for 800 V bus systems; limited to ≤400 V DC applications	Choose only for cost-sensitive, lower-voltage (<400 V) SMPS secondary rectification where softness is less critical.

Compared with STTH2R012DJF and ES1J-M3/5AT, STTA212S uniquely balances 1200 V capability, SMC surface-mount compatibility, and soft recovery (S = 0.9) - making it optimal for space-constrained, high-reliability motor drives and industrial SMPS where EMI and transistor loss reduction are prioritized.

Availability

STTA212S is available at Aetrix Electronics and suitable for motor control inverters, industrial SMPS primary snubbers, and high-voltage DC-DC converter rectifiers requiring stable component supply and long-term design-in support.

Supply support for STTA212S 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.

The TURBOSWITCH product line was developed specifically for high-efficiency, low-EMI power conversion-targeting IGBT/MOSFET companion diodes in motor drives, UPS, and telecom SMPS where soft recovery and voltage ruggedness are essential.

FAQ

What is the maximum junction temperature for continuous operation?

The STTA212S has a maximum operating junction temperature (T_j) of 125 °C, validated under steady-state conduction at I_F(AV) = 2 A and δ = 0.5. Operation beyond this limit risks accelerated degradation of reverse leakage and softness characteristics, and thermal runaway under high dI/dt conditions.

Is STTA212S suitable for use with 650 V SiC MOSFETs?

Yes - its 1200 V V_RRM provides sufficient margin for 650 V SiC MOSFET applications, and its soft recovery (S = 0.9) minimizes voltage overshoot during commutation. However, its t_rr and Q_rr are higher than SiC Schottky alternatives, so it is best suited for <200 kHz operation where SiC body diode limitations require external clamping.

How does the softness factor affect EMI in motor drive designs?

A softness factor of 0.9 means 90% of reverse recovery current decays gradually (t_b/t_a = 0.9), reducing di/dt-induced voltage spikes and high-frequency ringing. In 3-phase inverter leg layouts, this lowers common-mode noise by up to 15 dB compared to hard-recovery diodes, easing EMC filter requirements.

Can STTA212S replace STTH2R012DJF in existing TO-220 footprints?

No - STTA212S uses an SMC (DO-214AB) surface-mount package, while STTH2R012DJF uses TO-220AC. They are not mechanically or thermally interchangeable. Direct replacement requires PCB redesign, thermal analysis for 21 °C/W vs. TO-220's ~3.5 °C/W case-to-heatsink resistance, and verification of solder joint reliability under thermal cycling.

STTA212S Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: TURBOSWITCH™

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1.65 V @ 2 A

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

Reverse Recovery Time (trr):: 115 ns

Current - Reverse Leakage @ Vr:: 20 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMC

Operating Temperature - Junction:: 125°C (Max)

STTA212S FAQ

1.How can I place an order for STTA212S through Aetrix?

Please submit a Request for Quotation (RFQ) for STTA212S 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 STTA212S reliable?

The price and inventory of STTA212S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTA212S is usually 5 days.

3.What payment methods are accepted for STTA212S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTA212S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTA212S?

STTA212S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTA212S 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 STTA212S?

For technical support, including STTA212S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTA212S requirements.

6.How does Aetrix verify that STTA212S is sourced from the original manufacturer or authorized distributors?

All STTA212S 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 STTA212S meets industry standards.

7.What is the process for return or replacement of STTA212S?

All STTA212S units undergo pre-shipment inspection (PSI). If there is an issue with STTA212S, 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 STTA212S part is unused and in its original packaging.

Return procedure for STTA212S:

1.Submit a request within 90 days.

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

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