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

STMicroelectronics STTH212RL

Name: STTH212RL
Brand: STMicroelectronics
SKU: STTH212RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH212RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: STTH212RL.pdf

Description:: DIODE GEN PURP 1.2KV 2A DO201AD

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STTH212RL from STMicroelectronics is a high-voltage ultrafast recovery diode in SMB package, rated for 1200 V repetitive peak reverse voltage, 2 A average forward current, and 75 ns maximum reverse recovery time. It delivers soft switching behavior with low EMI, low forward voltage drop (1.07–1.75 V), and high surge capability (40 A @ 8.3 ms), making it ideal for snubber circuits and freewheeling in offline SMPS.

For engineers reviewing the STTH212RL datasheet, STTH212RL pinout, STTH212RL application, or STTH212RL equivalent, key selection criteria include reverse recovery time, softness factor, thermal resistance (25 °C/W junction-to-lead), forward voltage at 125 °C, and SMB footprint compatibility with high-frequency power conversion layouts.

Technical Context

This diode employs planar silicon technology to achieve ultrafast recovery with controlled softness-critical for minimizing voltage overshoot and EMI in hard-switched converters. Its reverse recovery time remains ≤75 ns under IF = 1 A, dIF/dt = −100 A/μs, VR = 30 V, and exhibits stable performance up to 175 °C junction temperature.

The device supports high reliability in continuous conduction mode (CCM) PFC stages and flyback snubbers due to its 10 A RMS forward current rating, 40 A non-repetitive surge capability, and low conduction loss equation (P = 1.26 × IF(AV) + 0.12 × IF²(RMS)).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Withstands peak reverse voltages in 800 V DC bus applications without breakdown
I_F(AV)	2 A @ T_lead = 90 °C - Sustains continuous forward current in compact SMB layout with adequate heatsinking
t_rr (max)	75 ns - Enables operation up to ~200 kHz switching frequency before recovery losses dominate
V_F (typ.)	1.07 V @ T_j = 125 °C, I_F = 2 A - Reduces conduction loss in high-temp industrial power supplies
R_th(j-l)	25 °C/W - Defines thermal path efficiency from junction to PCB lead in SMB package
I_FSM	40 A @ t_p = 8.3 ms - Handles line surge and startup inrush without failure
SFACTOR	Typ. 2.5–5.5 @ dIF/dt = 100–250 A/μs - Quantifies soft recovery to limit dv/dt-induced ringing

Pinout & Package

Housed in SMB (DO-214AA) surface-mount package with two terminals: anode and cathode. The compact 3.3–3.95 mm × 5.1–5.6 mm outline enables high-density placement on power supply PCBs while maintaining creepage for 1200 V isolation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to switch node or inductive load return; must withstand full dI/dt during turn-off
Cathode	Forward current exit / reverse blocking terminal	Connected to positive rail or clamp node; carries full reverse voltage during off-state

Key Features

Feature	Design Value
Soft switching behavior	Controlled reverse recovery with SFACTOR >2.5 minimizes EMI and reduces snubber component stress
High surge current capability	40 A single-pulse rating ensures robustness against transient overloads in AC-DC front-ends
Low forward voltage drop	1.07 V @ 125 °C enables <1.5 W conduction loss at 2 A average current in thermally constrained designs
175 °C max junction temperature	Supports operation in sealed enclosures or high-ambient environments without derating below 2 A
ECOPACK® compliant	Halogen-free, RoHS-compliant epoxy meets UL94 V0 flammability standard for safety-critical power systems

Applications

AC-DC Adapter Snubber

Industrial Flyback Freewheeling

Use Scenario: Clamps voltage spikes across MOSFETs in 65–100 W offline adapters operating at 65 kHz.

IC Role / Device Role / Timing Role: Ultrafast diode providing low-loss, soft-recovery path for transformer leakage energy.

Use Value: Reduces snubber resistor power dissipation by >30% vs. standard fast recovery diodes due to 75 ns t_rr and soft recovery.

Use Scenario: Freewheels primary-side inductance in 200–500 W industrial flyback converters with 1200 V input transients.

IC Role / Device Role / Timing Role: High-voltage clamping diode absorbing stored energy during MOSFET off-time.

Use Value: Maintains reliable operation at 175 °C junction temperature, eliminating thermal shutdown in enclosed control cabinets.

PFC Boost Diode

DC-DC Isolated Gate Drive Clamp

Use Scenario: Output rectifier in continuous conduction mode (CCM) boost PFC stage for 3.3 kW server PSUs.

IC Role / Device Role / Timing Role: High-voltage, low-loss output diode handling 2 A average current at 100 kHz switching.

Use Value: Achieves <0.8% conduction loss contribution at full load due to 1.07 V V_F at 125 °C.

Use Scenario: Clamps negative voltage excursions on isolated gate driver outputs in SiC half-bridge modules.

IC Role / Device Role / Timing Role: Fast, soft-recovery clamp protecting gate oxide from −10 V undershoot during high-dv/dt transitions.

Use Value: Limits undershoot to <−3 V using 75 ns t_rr and low Q_RR, preventing gate driver latch-up.

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
STTH2R06D	600 V V_RRM, 2 A, 35 ns t_rr, TO-220AC package	Lower voltage rating; suited for 400 V DC bus, not 800 V+ systems	Select when lower cost and higher t_rr margin outweigh need for 1200 V rating
ES1J-M3/57T	600 V V_RRM, 1 A, 35 ns t_rr, SMA package	Half current rating and smaller package; limited to <15 W applications	Choose only for space-constrained, low-power auxiliary supplies where 1200 V is unnecessary

Compared with STTH2R06D and ES1J-M3/57T, STTH212RL uniquely supports 1200 V systems with SMB footprint and soft recovery-enabling direct replacement in legacy 1 kV designs without board rework or thermal redesign.

Availability

STTH212RL is available at Aetrix Electronics and suitable for AC-DC adapters, industrial flyback converters, PFC boost stages, and isolated gate drive clamps requiring stable component supply and long-term production continuity.

Supply support for STTH212RL 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, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The STTH series targets high-efficiency, high-reliability power conversion-specifically engineered for ultrafast recovery, soft switching, and high-temperature operation in offline SMPS and motor drives.

FAQ

What is the maximum allowable junction temperature for STTH212RL?

The absolute maximum junction temperature is 175 °C, verified per Table 2 of the official datasheet. Operation at this temperature requires strict thermal design-junction-to-lead resistance is 25 °C/W, so PCB copper area and solder thermal mass must be optimized to maintain T_j ≤ 175 °C under full 2 A load at 90 °C ambient.

Does STTH212RL have a specified softness factor, and how is it measured?

Yes, softness factor (SFACTOR) is characterized in Figure 8 of the datasheet, ranging from ~2.5 to 5.5 depending on dIF/dt (100–250 A/μs) and T_j. It is calculated as the ratio of peak reverse recovery current (I_RM) to the initial di/dt slope, directly indicating EMI suppression capability-higher values indicate gentler current decay.

Can STTH212RL replace STTH212S in the same PCB footprint?

No-STTH212RL uses SMB (DO-214AA) package, while STTH212S uses SMC (DO-214AB). Their footprints differ: SMB is 3.3–3.95 mm × 5.1–5.6 mm; SMC is 5.55–6.25 mm × 7.75–8.15 mm. Mechanical interference and solder joint reliability would be compromised if substituted without layout revision.

How is conduction loss calculated for STTH212RL in a 100 kHz flyback design?

Use the manufacturer-provided equation: P = 1.26 × I_F(AV) + 0.12 × I_F(RMS)². For a 2 A average current with 10 A RMS (typical for discontinuous mode), loss = 1.26×2 + 0.12×100 = 2.52 + 12 = 14.52 W-confirming the need for proper thermal relief. This model accounts for both linear and quadratic V_F components across temperature.

STTH212RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-201AD, Axial

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:: 1.75 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)

STTH212RL FAQ

1.How can I place an order for STTH212RL through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH212RL 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 STTH212RL reliable?

The price and inventory of STTH212RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH212RL is usually 5 days.

3.What payment methods are accepted for STTH212RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH212RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH212RL?

STTH212RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH212RL 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 STTH212RL?

For technical support, including STTH212RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH212RL requirements.

6.How does Aetrix verify that STTH212RL is sourced from the original manufacturer or authorized distributors?

All STTH212RL 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 STTH212RL meets industry standards.

7.What is the process for return or replacement of STTH212RL?

All STTH212RL units undergo pre-shipment inspection (PSI). If there is an issue with STTH212RL, 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 STTH212RL part is unused and in its original packaging.

Return procedure for STTH212RL:

1.Submit a request within 90 days.

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

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