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

STMicroelectronics STTH1210DY

Name: STTH1210DY
Brand: STMicroelectronics
SKU: STTH1210DY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH1210DY

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-220-2

Datasheet:: STTH1210DY.pdf

Description:: DIODE GEN PURP 1KV 12A TO220AC

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Product details

Overview

STTH1210DY from STMicroelectronics is an AEC-Q101-qualified ultrafast recovery high-voltage diode in TO-220AC package, rated for 1000 V repetitive peak reverse voltage, 12 A average forward current, and 48 ns typical reverse recovery time at 125 °C. It delivers soft recovery, low conduction losses (VF = 1.30 V typ. at 150 °C), and operates up to 175 °C junction temperature-designed for automotive power converters and snubber circuits.

For engineers reviewing the STTH1210DY datasheet, STTH1210DY pinout, STTH1210DY application, or STTH1210DY equivalent, key selection criteria include reverse recovery softness (S = 2), thermal resistance (Rth(j-c) = 1.9 °C/W), pulsed current capability (IFRM = 120 A), and AEC-Q101 qualification for under-hood reliability.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for ultrafast, soft reverse recovery-minimizing voltage overshoot and EMI in high-frequency switching. Its low leakage current (<30 µA at 125 °C) and stable VF across temperature (1.30–1.80 V from 150 °C to 25 °C) support thermal runaway mitigation in high-power auxiliary rails.

Dynamic performance is characterized under controlled dIF/dt conditions: trr = 48 ns (typ.) at –200 A/µs, IRM = 15–20 A, and Qrr = <3.5 µC at 125 °C. The softness factor S = 2 ensures gradual carrier recombination, reducing ringing in inductive turn-off transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	1000 V - Withstands 1 kV repetitive reverse voltage, enabling use in 800 V DC-link systems with safety margin.
IF(AV)	12 A at Tc = 125 °C - Continuous forward current rating under heatsink-cooled conditions.
trr (typ)	48 ns at Tj = 125 °C - Ultrafast recovery minimizes switching loss in 100–500 kHz SMPS topologies.
S (Softness)	2 - Soft recovery reduces voltage spikes and EMI during turn-off in inductive loads.
Rth(j-c)	1.9 °C/W - Enables efficient heat transfer to heatsink; supports 25 W dissipation at ΔT = 47.5 °C.
VF (typ)	1.30 V at IF = 12 A, Tj = 150 °C - Low conduction loss improves efficiency in high-temp automotive environments.
Tj max	175 °C - Rated for sustained operation in engine bay and powertrain control units.

Pinout & Package

TO-220AC package: single-ended, isolated tab (cathode-connected case), 3-pin outline with mounting hole. Thermal path optimized via metal tab contact; recommended torque 0.4–0.6 N·m.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to low-side switch node or return path; requires low-inductance layout to minimize turn-on overshoot.
Cathode	Forward current exit / reverse blocking terminal	Internally bonded to metal tab; electrically tied to heatsink-must be insulated unless system ground reference permits.
Case (Tab)	Thermal interface & cathode connection	Provides primary thermal conduction path; isolation voltage rating depends on insulator material (e.g., mica + grease).

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive temperature cycling, humidity, and mechanical shock-suitable for engine control, ADAS, and battery management.
Ultrafast soft recovery	trr ≤ 90 ns (max) with S = 2 ensures low EMI and reduced snubber stress in flyback and LLC resonant converters.
Low VF drift over temperature	VF increases only ~0.5 V from 25 °C to 150 °C-enables stable loss budgeting in wide-temperature-range designs.
High pulsed current rating	IFRM = 120 A (5 µs square wave)-supports surge handling in motor drive freewheeling and boost PFC stages.
Robust thermal design	Rth(j-c) = 1.9 °C/W and Tj(max) = 175 °C allow compact heatsinking in space-constrained automotive modules.

Applications

Automotive DC-DC Converters

Snubber Circuits in IGBT Modules

Use Scenario: 48 V–12 V bidirectional buck-boost converter in mild hybrid vehicles.

IC Role / Device Role / Timing Role: Freewheeling diode during synchronous rectification phase; handles 12 A continuous and 120 A transient currents.

Use Value: Soft recovery (S = 2) suppresses voltage spikes across IGBTs, reducing gate driver stress and improving system reliability.

Use Scenario: RCD snubber network across 650 V IGBTs in traction inverter submodules.

IC Role / Device Role / Timing Role: Clamps inductive turn-off energy; recovers before next switching cycle at 10–20 kHz.

Use Value: 48 ns trr enables snubber reset within 100 ns window, minimizing energy loss and capacitor stress.

Onboard Charger (OBC) Boost PFC

Demagnetization Diode in Flyback PSUs

Use Scenario: Boost diode in 3.3 kW OBC front-end operating at 100 kHz with 800 V DC-link.

IC Role / Device Role / Timing Role: Conducts during MOSFET off-time; blocks 1000 V reverse voltage during line peaks.

Use Value: 1000 V VRRM and low Qrr (<3.5 µC) reduce switching loss by >15% vs. standard FRD alternatives.

Use Scenario: Auxiliary winding demagnetization path in 65 W flyback PSU for automotive infotainment head units.

IC Role / Device Role / Timing Role: Provides fast, low-loss return path for transformer reset current at 66 kHz.

Use Value: 1.30 V VF at 150 °C maintains regulation accuracy and prevents thermal runaway in sealed enclosures.

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; trr = 60 ns (typ); VF = 1.45 V @ 125 °C; TO-220AB package.	Requires dual-diode layout; higher VF increases conduction loss in high-duty-cycle apps.	Prefer when dual-channel layout exists or cost sensitivity outweighs softness requirement.
Vishay VS-12EWH10	12 A/1000 V; trr = 55 ns (typ); VF = 1.35 V @ 150 °C; AEC-Q101 qualified; TO-220AC.	Softer recovery not specified; no published S-factor; lower IR (5 µA @ 125 °C) but unverified thermal robustness.	Acceptable where softness is secondary and leakage-critical bias networks dominate.

Compared with MUR1210CT and VS-12EWH10, STTH1210DY uniquely combines AEC-Q101 qualification, documented softness (S = 2), and lowest VF at 150 °C-making it optimal for thermally constrained, EMI-sensitive automotive power stages.

Availability

STTH1210DY is available at Aetrix Electronics and suitable for automotive DC-DC converters, onboard chargers, and IGBT snubber networks requiring stable component supply, long-lifecycle assurance, and AEC-Q101 compliance.

Supply support for STTH1210DY 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, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing and AEC-Q101 validation infrastructure.

This device belongs to ST's STTH ultrafast diode product line, engineered specifically for high-reliability automotive power conversion where low trr, soft recovery, and thermal ruggedness are mandatory-not general-purpose rectification.

FAQ

Is STTH1210DY pin-compatible with standard TO-220AC rectifiers?

Yes-STTH1210DY uses the industry-standard TO-220AC footprint with anode, cathode, and isolated tab terminals. Mechanical dimensions match JEDEC TO-220AC spec (L6 = 15.25–15.75 mm, ØI = 3.75–3.85 mm), enabling drop-in replacement in existing layouts without PCB revision.

What is the maximum allowable case temperature for continuous operation?

The datasheet specifies IF(AV) = 12 A at Tc = 125 °C. With Rth(j-c) = 1.9 °C/W and Tj(max) = 175 °C, the maximum sustainable case temperature is 125 °C. Exceeding this requires derating per Figure 1; at Tc = 100 °C, IF(AV) rises to ~14.5 A.

Does STTH1210DY require a thermal pad or insulator when mounted to a heatsink?

Yes-the cathode is internally connected to the metal tab. Unless the heatsink is electrically referenced to cathode potential, a dielectric insulator (e.g., silicone pad or mica washer) with thermal grease is required to prevent shorting while maintaining Rth(j-c) ≤ 1.9 °C/W.

How does softness factor S = 2 impact EMI in a 200 kHz flyback converter?

A softness factor of 2 indicates gradual minority-carrier removal during turn-off, reducing di/dt-induced voltage spikes. In a 200 kHz flyback, this lowers peak-to-peak noise on the drain node by ~3–5 dB and decreases common-mode EMI, easing EMC filter design and reducing Y-capacitor stress.

STTH1210DY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-2

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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC

Operating Temperature - Junction:: -40°C ~ 175°C

STTH1210DY FAQ

1.How can I place an order for STTH1210DY through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH1210DY 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 STTH1210DY reliable?

The price and inventory of STTH1210DY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH1210DY is usually 5 days.

3.What payment methods are accepted for STTH1210DY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH1210DY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH1210DY?

STTH1210DY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH1210DY 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 STTH1210DY?

For technical support, including STTH1210DY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH1210DY requirements.

6.How does Aetrix verify that STTH1210DY is sourced from the original manufacturer or authorized distributors?

All STTH1210DY 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 STTH1210DY meets industry standards.

7.What is the process for return or replacement of STTH1210DY?

All STTH1210DY units undergo pre-shipment inspection (PSI). If there is an issue with STTH1210DY, 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 STTH1210DY part is unused and in its original packaging.

Return procedure for STTH1210DY:

1.Submit a request within 90 days.

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

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