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

STMicroelectronics STTH212

Name: STTH212
Brand: STMicroelectronics
SKU: STTH212
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH212

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: STTH212.pdf

Description:: DIODE GEN PURP 1.2KV 2A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:5,076

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Product details

Overview

STTH212 from STMicroelectronics is a high-voltage ultrafast recovery diode in SMB and SMC packages, designed for freewheeling, clamping, snubbering, and demagnetization in switch-mode power supplies. It delivers 1200 V repetitive peak reverse voltage, 2 A average forward current (SMB), 75 ns max reverse recovery time, and soft switching behavior to suppress EMI in high-frequency converters.

For engineers reviewing the STTH212 datasheet, STTH212 pinout, STTH212 application, or STTH212 equivalent, key selection criteria include reverse recovery softness factor, thermal resistance junction-to-lead (25 °C/W for SMB), conduction loss equation (P = 1.26 × IF(AV) + 0.12 × IF²(RMS)), and dual-package availability for layout flexibility.

Technical Context

This planar-technology diode operates with a maximum junction temperature of 175 °C and exhibits low forward voltage drop (1.07–1.50 V at 125–150 °C, 2 A). Its ultrafast trr ≤ 75 ns and soft recovery waveform minimize switching losses and voltage overshoot during turn-off.

Dynamic performance is characterized by controlled dIF/dt dependence: reverse recovery charge QRR ranges from ~100 to 400 nC (at dIF/dt = 50–500 A/µs), and softness factor remains >2.5 across operating conditions-critical for reducing RFI in PFC and LLC resonant stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - supports DC bus voltages up to 850 V RMS in offline SMPS designs
I_F(AV)	2 A (SMB), 2 A (SMC) - continuous conduction capability at T_lead = 90 °C (SMB) or 105 °C (SMC)
t_rr (max)	75 ns - enables operation at ≥100 kHz switching frequencies with low turn-off loss
V_F (typ.)	1.07 V @ 125 °C, 2 A - reduces conduction loss vs. standard fast diodes in high-temp environments
R_th(j-l)	25 °C/W (SMB), 20 °C/W (SMC) - defines thermal path efficiency to PCB copper; critical for thermal design margin
I_FSM	40 A (8.3 ms) - withstands inrush and transient surge currents in AC-DC front-end rectification
Softness factor	>2.5 (typ.) - suppresses EMI by limiting di/dt during reverse recovery, easing filter design

Pinout & Package

Housed in industry-standard SMB (DO-214AA) and SMC (DO-214AB) surface-mount packages. Both are single-diode configurations with anode and cathode terminals only.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to switching node (e.g., MOSFET drain) in freewheeling paths; polarity-sensitive for correct conduction direction
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail or ground return; sustains 1200 V reverse bias during off-state without leakage degradation

Key Features

Feature	Design Value
Ultrafast soft recovery	trr ≤ 75 ns with softness factor >2.5 - reduces EMI generation and snubber stress in high-dV/dt topologies
High surge robustness	40 A non-repetitive surge (8.3 ms) - survives line transients and startup surges in industrial power supplies
High-temperature operation	T_j(max) = 175 °C - enables compact heatsinking in enclosed or high-ambient environments
Low conduction loss model	P = 1.26 × I_F(AV) + 0.12 × I_F(RMS)² - enables accurate thermal simulation without curve-fitting
ECOPACK® compliance	RoHS-compliant epoxy (UL94 V0) - meets environmental requirements for industrial and consumer end-equipment

Applications

AC-DC Power Supply Output Rectification

LLC Resonant Converter Freewheeling

Use Scenario: Secondary-side rectification in 100–500 W offline adapters and open-frame PSUs.

IC Role / Device Role / Timing Role: Ultrafast diode conducting during MOSFET off-time; recovers before next switching cycle to prevent cross-conduction.

Use Value: 75 ns t_rr and soft recovery reduce output ripple and EMI filter size versus standard fast diodes.

Use Scenario: Freewheeling path in half-bridge LLC resonant converters used in server PSUs and telecom rectifiers.

IC Role / Device Role / Timing Role: Provides low-loss, zero-voltage-switching (ZVS)-compatible commutation path during dead-time intervals.

Use Value: Soft recovery minimizes voltage spikes across resonant tank components, improving reliability and efficiency at 200–500 kHz.

Snubber Network Clamping

Inductive Load Demagnetization

Use Scenario: RCD snubber clamp across flyback transformer primary or MOSFET drain in isolated DC-DC converters.

IC Role / Device Role / Timing Role: Absorbs leakage energy during MOSFET turn-off; blocks 1200 V reverse voltage while recovering rapidly.

Use Value: Low V_F (1.07 V) and fast t_rr reduce snubber power dissipation and improve overall conversion efficiency.

Use Scenario: Demagnetization path for solenoid drivers, relay coils, and motor phase windings in industrial controls.

IC Role / Device Role / Timing Role: Provides controlled energy dissipation path when inductive current is interrupted; prevents voltage runaway via 1200 V blocking.

Use Value: High I_FSM (40 A) ensures survival during repeated coil de-energization events with high dI/dt.

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
STTH2R06	600 V V_RRM, same SMB/SMC packages, 75 ns t_rr, but lower surge rating (30 A)	Suitable for 230 VAC-input systems only; not rated for 400 VDC+ bus applications	Select when system DC bus ≤ 400 V and thermal margin allows higher V_F at elevated T_j
UF2SC120	1200 V V_RRM, SiC Schottky, zero reverse recovery, but higher V_F (1.7 V typ.) and cost	Eliminates recovery loss entirely but requires re-optimization of gate drive and layout for high dV/dt immunity	Choose for highest efficiency at >300 kHz or where EMI must be minimized below 30 MHz

Compared with STTH2R06, STTH212 provides 2× higher voltage margin for universal-input or 3-phase rectified supplies; compared with UF2SC120, it offers lower forward loss and proven ruggedness in legacy silicon-based topologies without SiC-specific layout constraints.

Availability

STTH212 is available at Aetrix Electronics and suitable for AC-DC power supply output rectification, LLC resonant converter freewheeling, and snubber network clamping requiring stable component supply and long-term industrial lifecycle support.

Supply support for STTH212 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, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STTH series targets high-efficiency, high-reliability power conversion-specifically engineered for ultrafast recovery, soft switching, and thermal resilience in demanding offline and resonant power topologies.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The STTH212 has a maximum operating junction temperature of 175 °C, verified per absolute ratings table. This allows full-rated conduction at elevated ambient temperatures when mounted on adequate copper area (≥4 cm² per lead for SMC), and supports derating curves up to that limit without parameter shift or reliability risk.

Does STTH212 have a specified softness factor, and how is it measured?

Yes-the softness factor exceeds 2.5 across dIF/dt = 50–500 A/µs and T_j = 125 °C, derived from Figure 8 in the datasheet. It is calculated as the ratio of peak reverse recovery current (I_RM) to its rate-of-change (dI_R/dt), indicating gradual current decay and reduced EMI generation during turn-off.

Can STTH212 replace a standard fast recovery diode in an existing 100 kHz flyback design?

Yes-its 75 ns t_rr, soft recovery, and 1200 V rating make it a direct upgrade over typical 150–300 ns fast diodes. Expected benefits include lower switching loss, reduced snubber dissipation, and measurable EMI reduction-provided layout maintains short, low-inductance cathode traces to preserve softness behavior.

What is the thermal resistance junction-to-ambient for STTH212 in SMB package on FR4 PCB?

R_th(j-a) is not fixed-it varies with copper area. Per Figure 13, it drops from ~80 °C/W (no copper) to ~40 °C/W with 1 cm² copper per lead on FR4. For thermal design, use R_th(j-l) = 25 °C/W (SMB) as the fixed junction-to-lead value, then add board-level thermal resistance based on actual copper layout.

STTH212 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1.75 V @ 2 A

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

Reverse Recovery Time (trr):: 75 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

STTH212 FAQ

1.How can I place an order for STTH212 through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH212 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 STTH212 reliable?

The price and inventory of STTH212 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH212 is usually 5 days.

3.What payment methods are accepted for STTH212?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH212 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH212?

STTH212 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH212 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 STTH212?

For technical support, including STTH212 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH212 requirements.

6.How does Aetrix verify that STTH212 is sourced from the original manufacturer or authorized distributors?

All STTH212 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 STTH212 meets industry standards.

7.What is the process for return or replacement of STTH212?

All STTH212 units undergo pre-shipment inspection (PSI). If there is an issue with STTH212, 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 STTH212 part is unused and in its original packaging.

Return procedure for STTH212:

1.Submit a request within 90 days.

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

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