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

STMicroelectronics STTA512F

Name: STTA512F
Brand: STMicroelectronics
SKU: STTA512F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTA512F

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: ISOWATT220AC-3

Datasheet:: STTA512F.pdf

Description:: DIODE GP 1.2KV 5A ISOWATT-220AC

Quantity:: RFQ Add To RFQ list

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Inventory:9,196

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Product details

Overview

STTA512F from STMicroelectronics is an ultra-fast, soft-recovery 1200V high-voltage diode in ISOWATT220AC insulated package, rated for 5A average forward current and 45ns typical reverse recovery time, with 2000V DC electrical insulation and 12pF capacitance - used as snubber, clamping, demagnetization, or high-voltage rectifier diode in SMPS primary/secondary and motor control freewheel circuits.

For engineers reviewing the STTA512F datasheet, STTA512F pinout, STTA512F application, or STTA512F equivalent, key selection criteria include softness factor (1.2), low conduction loss (V_t0 = 1.57V, R_d = 86mΩ), ultra-fast trr (45ns typ.), high V_RRM (1200V), and insulated thermal interface suitability for IGBT/MOSFET companion switching loss reduction.

Technical Context

This diode employs optimized carrier lifetime control to achieve soft reverse recovery (S-factor = 1.2 at 125°C, dIF/dt = −500 A/µs) and low noise turn-off, minimizing voltage overshoot and EMI in high-dI/dt switching environments. Its 1200V repetitive peak reverse voltage and 45ns trr enable reliable operation in hard-switched SMPS snubbers and IGBT freewheel paths.

The ISOWATT220AC package provides 2000V DC insulation between cathode and mounting base, with 5.5°C/W junction-to-case thermal resistance and 10A RMS forward rating at T_c = 84°C - enabling direct heatsink mounting without isolation hardware while maintaining safe creepage/clearance in high-voltage industrial power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - supports primary-side clamp/snubber circuits in 800–1000V bus systems without derating.
trr (typ)	45 ns - enables stable operation up to ~2 MHz switching frequency in resonant or hard-switched topologies.
V_F (max)	2.0 V @ T_j = 125°C - limits conduction loss to ≤10W at 5A DC in continuous freewheel mode.
S-factor	1.2 - ensures soft, oscillation-free turn-off with minimal voltage ringing during IGBT/MOSFET commutation.
R_th(j-c)	5.5 °C/W - allows 10A RMS conduction at 84°C case temperature with standard heatsinking.
Insulation	2000 V DC - eliminates need for insulating pads or bushings when mounted to grounded heatsinks.
C_iss	12 pF - minimizes capacitive coupling and EMI in high-dv/dt gate-drive adjacent layouts.

Pinout & Package

STTA512F uses the ISOWATT220AC package: insulated plastic case with metal tab (cathode) electrically isolated from mounting surface; requires no thermal pad or insulator for grounded heatsink mounting. Dimensions: 4.4–4.6 mm (A), 2.5–2.7 mm (B), 10.0–10.4 mm (H), 3.0–3.2 mm mounting hole diameter.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead)	Forward current entry point	Connected to switch node (e.g., IGBT collector); carries full load current during freewheeling.
Cathode (tab)	Forward current exit / mounting surface	Electrically isolated metal tab serves as cathode terminal and thermal path; rated for 2000V DC isolation from heatsink.

Key Features

Feature	Design Value
Ultra-fast soft recovery	trr = 45 ns (typ), S-factor = 1.2 - suppresses voltage spikes and reduces EMI in IGBT/MOSFET turn-off.
High-voltage ruggedness	V_RRM = 1200 V, V_RSM = 1200 V - withstands transient overvoltages in 600–800V DC bus applications.
Low conduction loss	V_t0 = 1.57 V, R_d = 86 mΩ - enables <10W dissipation at 5A average current, reducing heatsink size.
Insulated thermal interface	2000 V DC isolation, 12 pF capacitance - eliminates insulating hardware while maintaining safety compliance.
High pulsed current capability	I_FRM = 70 A (5 µs square wave) - sustains short-circuit or overload conditions without failure.

Applications

Motor Drive Freewheel Diode

SMPS Primary Snubber Diode

Use Scenario: Bidirectional IGBT-based inverter driving 3-phase induction motor with regenerative braking.

IC Role / Device Role / Timing Role: Freewheel path for inductive back-EMF during IGBT turn-off; conducts only during dead-time and current reversal.

Use Value: Soft recovery (S = 1.2) prevents voltage overshoot beyond 1200V rating, eliminating need for external RC snubbers.

Use Scenario: Clamp circuit across flyback transformer primary in 1 kW telecom SMPS.

IC Role / Device Role / Timing Role: Absorbs leakage inductance energy during MOSFET turn-off; conducts for <100 ns per cycle.

Use Value: 45 ns trr ensures full energy transfer before next switching event, improving efficiency by >1.2% vs. standard fast diodes.

SMPS Secondary Rectifier

Demagnetization Diode in Forward Converter

Use Scenario: High-voltage output stage of 48 V/20 A server PSU using active clamp forward topology.

IC Role / Device Role / Timing Role: Rectifies 1200 V reflected secondary voltage during MOSFET off-time; operates at 100–300 kHz.

Use Value: 1200 V V_RRM and low C_iss (12 pF) reduce dynamic losses and EMI in high-frequency rectification.

Use Scenario: Demagnetization path for transformer reset in 500 W industrial forward converter.

IC Role / Device Role / Timing Role: Provides controlled discharge path for magnetizing current after main switch turn-off.

Use Value: Ultra-low reverse recovery charge (Q_rr implied by trr = 45 ns & I_RM = 20 A) minimizes reset time and core loss.

Availability

STTA512F is available at Aetrix Electronics and suitable for motor control inverters, telecom SMPS primary clamping, and industrial forward converter demagnetization requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STTA512F 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The TURBOSWITCH series was developed specifically to replace standard ultrafast diodes in high-voltage, high-dI/dt power conversion where soft recovery, low loss, and system-level EMI reduction are critical.

FAQ

What is the maximum junction temperature and how does it affect reliability?

The STTA512F has a maximum operating junction temperature of 150°C. At this limit, reverse leakage rises to 2.0 mA (vs. 0.3 µA at 25°C), and trr increases to 95 ns - requiring thermal design that maintains T_j ≤135°C under worst-case load to ensure 10-year field reliability in industrial environments.

Can STTA512F be used as a direct replacement for STTH8R06D?

No - STTH8R06D is a 600V, 8A ultrafast diode in TO-220AC with trr = 60 ns and no insulation. STTA512F operates at 1200V with 2000V isolation and lower trr (45 ns), but its 5A average rating and 5.5°C/W thermal resistance require different heatsinking and cannot substitute in identical footprint or current-class designs.

How does the softness factor impact EMI performance?

A softness factor of 1.2 means the reverse recovery current decays gradually (tb/ta = 1.2), producing smooth dI/dt transitions instead of abrupt current collapse. This reduces high-frequency spectral content above 30 MHz, lowering conducted EMI by 8–10 dB compared to standard fast diodes in the same SMPS layout.

Is the ISOWATT220AC package compatible with standard TO-220 heatsinks?

Yes - ISOWATT220AC shares identical mounting hole spacing (9.0–9.3 mm), tab width (4.95–5.20 mm), and screw torque spec (0.55 m·N recommended) with TO-220AC. The insulated tab allows direct mounting to grounded heatsinks without additional isolation hardware, simplifying mechanical assembly.

STTA512F Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: TURBOSWITCH™

Package/Case:: ISOWATT220AC-3

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

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

Current - Average Rectified (Io):: 5A

Voltage - Forward (Vf) (Max) @ If:: 2.2 V @ 5 A

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

Reverse Recovery Time (trr):: 95 ns

Current - Reverse Leakage @ Vr:: 100 µA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ISOWATT-220AC

Operating Temperature - Junction:: 150°C (Max)

STTA512F FAQ

1.How can I place an order for STTA512F through Aetrix?

Please submit a Request for Quotation (RFQ) for STTA512F 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 STTA512F reliable?

The price and inventory of STTA512F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTA512F is usually 5 days.

3.What payment methods are accepted for STTA512F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTA512F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTA512F?

STTA512F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTA512F 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 STTA512F?

For technical support, including STTA512F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTA512F requirements.

6.How does Aetrix verify that STTA512F is sourced from the original manufacturer or authorized distributors?

All STTA512F 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 STTA512F meets industry standards.

7.What is the process for return or replacement of STTA512F?

All STTA512F units undergo pre-shipment inspection (PSI). If there is an issue with STTA512F, 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 STTA512F part is unused and in its original packaging.

Return procedure for STTA512F:

1.Submit a request within 90 days.

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

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