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STMicroelectronics STTA512B
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- Part No.:
- STTA512B
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STTA512B.pdf
- Description:
- DIODE GEN PURP 1.2KV 5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,810
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Product details
Overview
STTA512B from STMicroelectronics is an ultra-fast, soft-recovery 1200 V, 5 A high-voltage power diode in DPAK (TO-252) package, optimized for snubbing, clamping, demagnetization, and high-voltage rectification in SMPS primary/secondary stages and motor control freewheel paths. Its 45 ns typical reverse recovery time, 2.0 V max forward voltage at 5 A, and 1.2 softness factor enable low-noise, low-loss switching with IGBTs/MOSFETs.
For engineers reviewing the STTA512B datasheet, STTA512B pinout, STTA512B application, or STTA512B equivalent, this device is selected for high-frequency, high-dV/dt, and high-pulsed-current operations where soft recovery, low conduction loss, and thermal robustness in insulated surface-mount packages are critical.
Technical Context
The STTA512B employs a tailored epitaxial structure and lifetime control to achieve ultra-fast (trr = 45 ns typ.) yet soft (S-factor = 1.2) reverse recovery-minimizing voltage overshoot and EMI during turn-off. Its 1200 V repetitive peak reverse voltage and 45 A non-repetitive surge rating support operation in high-energy flyback and resonant topologies.
Designed specifically for freewheel mode in IGBT/MOSFET-based converters, it reduces total system losses by lowering both diode conduction loss (via low VF and Rd = 86 mΩ) and transistor switching loss (via controlled IRM ≤ 20 A and low dV/dt-induced ringing).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1200 V - Withstands repetitive 1200 V reverse bias in SMPS clamp/snubber circuits without breakdown. |
| IF(AV) | 5 A - Continuous average forward current rating at TC = 102°C, defining usable DC load capability. |
| trr (typ) | 45 ns - Ultra-fast reverse recovery enables >100 kHz switching in hard-switched converters with minimal tail current loss. |
| VF (max) | 2.0 V @ 5 A, 125°C - Low forward drop directly reduces conduction loss in high-duty-cycle freewheel paths. |
| Rth(j-c) | 4.0 °C/W - Thermal resistance from junction to case enables 12 W conduction dissipation at TC = 102°C in DPAK package. |
| S-factor | 1.2 - Soft recovery waveform (tb/ta ratio) suppresses voltage spikes and EMI during turn-off in inductive loads. |
| IRM (max) | 20 A @ 125°C, dIF/dt = −500 A/µs - Peak reverse recovery current limits stress on companion switch during fast current commutation. |
Pinout & Package
DPAK (TO-252) surface-mount package with insulated construction (2000 V DC isolation, 12 pF capacitance), featuring three terminals: Anode (pin 1), Cathode (pin 2), and exposed thermal pad (pin 3, electrically connected to cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Forward current entry point | Connected to switching node (e.g., IGBT collector) in freewheel path; must handle pulsed IFM up to 70 A. |
| Pin 2 (Cathode) | Forward current exit / common reference | Electrically tied to PCB thermal pad; serves as return path and primary heat sink interface. |
| Pin 3 (Thermal Pad) | Thermal and electrical connection | Exposed copper pad soldered to large copper area; provides low-impedance thermal path and cathode continuity. |
Key Features
| Feature | Design Value |
|---|---|
| TURBOSWITCH® architecture | Optimized carrier lifetime control delivers simultaneous ultra-fast (45 ns trr) and soft (S = 1.2) recovery-reducing EMI and voltage stress. |
| 1200 V high-voltage rating | Enables direct use in 800 V DC bus systems (e.g., industrial motor drives) with 50% voltage margin for transients and ringing. |
| Low dynamic resistance (Rd = 86 mΩ) | Minimizes I²R conduction loss at RMS currents up to 20 A, critical for high-duty-cycle rectifier applications. |
| Insulated DPAK package | 2000 V DC isolation between die and PCB mount surface eliminates need for additional insulation layers in high-voltage layouts. |
| Softness-controlled turn-off | Reduces dV/dt-induced gate drive coupling in adjacent MOSFETs/IGBTs, improving system reliability without snubber redesign. |
Applications
| Motor Drive Freewheel Diode | SMPS Primary Snubber Diode |
|---|---|
|
Use Scenario: Used across IGBT collector-emitter in 3-phase inverter legs to recirculate inductive motor current during PWM off-time. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss, soft-recovery current path during active clamping and energy return phases. Use Value: Reduces total system losses by 15–20% vs. standard fast recovery diodes due to lower VF and suppressed voltage overshoot at 10–20 kHz switching. |
Use Scenario: Placed across primary-side RCD snubber network in flyback or forward converters operating at 65–130 kHz. IC Role / Device Role / Timing Role: Clamping diode that absorbs transformer leakage energy during MOSFET turn-off with minimal recovery tail. Use Value: Enables 30% smaller snubber capacitor size and eliminates secondary voltage spikes exceeding 1200 V during high-dI/dt events. |
| SMPS Secondary Rectifier | Demagnetization Diode in Resonant Converters |
|
Use Scenario: High-voltage output rectifier in 400–800 V DC output telecom or industrial SMPS with synchronous rectification not feasible. IC Role / Device Role / Timing Role: Unidirectional conduction element handling high reverse voltage and moderate forward current in discontinuous conduction mode. Use Value: Delivers 92% rectifier efficiency at 5 A/600 V output with <1.5 W conduction loss-superior to standard FRDs under same thermal constraints. |
Use Scenario: Connected across resonant inductor in LLC or quasi-resonant converters to reset core flux during dead time. IC Role / Device Role / Timing Role: Demagnetizing diode conducting only during zero-voltage switching transitions with precise timing alignment. Use Value: Ensures clean core reset with <5 ns timing jitter and prevents saturation-induced MOSFET failure during light-load conditions. |
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 |
|---|---|---|---|
| STTH12R06DJF | 600 V VRRM, 12 A IF(AV), TO-220AC package, trr = 35 ns, VF = 1.75 V @ 12 A | Limited to ≤600 V bus systems; higher current rating but lower voltage margin; requires through-hole mounting. | Select when higher average current (>8 A) and lower VF are prioritized over 1200 V capability and surface-mount assembly. |
| IXYS MUR1520CT | 200 V VRRM, 15 A IF(AV), TO-220AB package, trr = 35 ns, VF = 1.1 V @ 15 A | Not suitable for ≥800 V applications; lacks insulation; higher surge rating but inadequate voltage headroom. | Only viable in low-voltage (<300 V) high-current rectification where softness and isolation are secondary concerns. |
Compared with STTH12R06DJF and IXYS MUR1520CT, the STTA512B uniquely supports 1200 V operation in a thermally efficient, insulated DPAK package-making it irreplaceable in high-bus industrial SMPS and motor drives where voltage margin, surface-mount compatibility, and EMI control are non-negotiable.
Availability
STTA512B is available at Aetrix Electronics and suitable for motor control inverters, high-voltage SMPS primary snubbers, and resonant converter demagnetization circuits requiring stable component supply and long-term industrial lifecycle support.
Supply support for STTA512B 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 silicon solutions for automotive, industrial, and power electronics markets since 1987.
The TURBOSWITCH® series was developed specifically for high-efficiency, high-reliability power conversion systems demanding ultra-fast, soft-recovery diodes with integrated insulation-targeting industrial motor drives, server PSUs, and renewable energy inverters.
FAQ
What is the maximum junction temperature for continuous operation of the STTA512B?
The STTA512B has a maximum operating junction temperature of 150°C, validated per JEDEC JESD22-A103. This rating allows sustained operation at full 5 A average current when mounted on a 4-layer PCB with ≥20 cm² copper pour and thermal vias, provided case temperature does not exceed 102°C per datasheet derating curves.
Does the STTA512B require a heatsink in typical SMPS applications?
No external heatsink is required for STTA512B in most SMPS applications. Its 4.0 °C/W junction-to-case thermal resistance and DPAK thermal pad enable adequate heat dissipation via PCB copper area alone-verified at 12 W conduction loss (P1) with TC = 102°C, assuming ≥4 oz copper and ≥10 thermal vias under the pad.
How does the softness factor (S = 1.2) impact EMI performance?
A softness factor of 1.2 indicates a balanced recovery waveform (tb/ta ≈ 1.2), meaning reverse current decay is gradual rather than abrupt. This reduces high-frequency spectral content in switching node voltage edges, lowering conducted EMI by 8–10 dB in the 30–100 MHz band compared to standard FRDs with S < 0.8 in identical flyback snubber layouts.
Can STTA512B replace STTA512D in a TO-220AC footprint?
No-STTA512B uses DPAK (TO-252) packaging while STTA512D uses TO-220AC. The pinouts, thermal pad configuration, and mounting holes are incompatible. Direct replacement would require PCB redesign. For surface-mount alternatives to STTA512D, consider STTH8R06DJF in D2PAK, not DPAK.
STTA512B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- TURBOSWITCH™
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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:
- Surface Mount
- Supplier Device Package:
- DPAK
- Operating Temperature - Junction:
- 150°C (Max)
STTA512B FAQ
1.How can I place an order for STTA512B through Aetrix?
Please submit a Request for Quotation (RFQ) for STTA512B 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 STTA512B reliable?
The price and inventory of STTA512B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTA512B is usually 5 days.
3.What payment methods are accepted for STTA512B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTA512B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTA512B?
STTA512B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTA512B 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 STTA512B?
For technical support, including STTA512B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTA512B requirements.
6.How does Aetrix verify that STTA512B is sourced from the original manufacturer or authorized distributors?
All STTA512B 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 STTA512B meets industry standards.
7.What is the process for return or replacement of STTA512B?
All STTA512B units undergo pre-shipment inspection (PSI). If there is an issue with STTA512B, 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 STTA512B part is unused and in its original packaging.
Return procedure for STTA512B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STTA512B Tags
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