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STMicroelectronics STTH208UFY
- Part No.:
- STTH208UFY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
STTH208UFY.pdf
- Description:
- DIODE GEN PURP 800V 2A SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:6,484
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Product details
Overview
STTH208UFY from STMicroelectronics is an AEC-Q101-qualified automotive ultrafast recovery rectifier diode in SMB Flat package with wettable flanks, rated for 800 V repetitive peak reverse voltage, 2 A average forward current, and 53 ns typical reverse recovery time; it serves as a free-wheeling or base-drive diode in high-frequency switching power supplies and automotive power converters.
For engineers reviewing the STTH208UFY datasheet, STTH208UFY pinout, STTH208UFY application, or STTH208UFY equivalent, key selection criteria include its 175 °C maximum junction temperature, low 0.89 V forward voltage at 150 °C, negligible switching losses, and ECOPACK3-compliant lead-free construction for automotive-grade thermal and environmental reliability.
Technical Context
This ultrafast rectifier uses ST's 1000 V planar technology to achieve low conduction losses (VF = 0.89 V @ Tj = 150 °C, IF = 2 A) and fast switching performance (trr = 53 ns typ. @ Tj = 25 °C, IF = 0.5 A, Irr = 0.25 A, IR = 1 A), enabling efficient operation in hard-switched SMPS and transistor gate drive circuits.
Its SMB Flat package with wettable flanks supports automated optical inspection (AOI) and provides 18 °C/W junction-to-lead thermal resistance, while the -40 °C to +175 °C operating range and AEC-Q101 qualification confirm suitability for under-hood automotive applications requiring high thermal robustness and long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - blocks up to 800 V reverse voltage without breakdown, suitable for 400 V DC-link systems with safety margin |
| IF(AV) | 2 A @ TL = 120 °C, δ = 0.5 - delivers continuous 2 A output in standard PCB-mount thermal conditions |
| Tj(max) | 175 °C - enables operation in high-ambient under-hood environments without derating |
| VF(typ) | 0.89 V @ Tj = 150 °C, IF = 2 A - reduces conduction loss to ~1.78 W per diode in high-temp operation |
| trr(typ) | 53 ns - minimizes switching loss and EMI in 100–500 kHz SMPS designs |
| Rth(j-l) | 18 °C/W - allows direct thermal path to PCB copper, supporting compact heatsinkless layouts |
| IR(max) | 50 µA @ Tj = 125 °C, VR = VRRM - ensures low leakage in high-voltage hold-off states |
Pinout & Package
SMB Flat package: surface-mount, flat lead profile with wettable flanks for AOI-compatible solder joint inspection; dimensions: E = 5.10–5.60 mm, D = 3.30–3.95 mm, L = 0.75–1.50 mm, weight = 50 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to switching node (e.g., MOSFET drain or transformer secondary); must handle 30 A surge (IFSM) |
| Cathode (K) | Forward current exit / reverse blocking terminal | Connected to ground or low-side return; sustains full 800 V reverse bias during off-state |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics including engine control units and ADAS power stages |
| Ultrafast recovery (53 ns typ.) | Reduces turn-off energy loss and limits voltage overshoot in flyback and LLC resonant converters |
| Low VF (0.89 V @ 150 °C) | Enables >95% efficiency in 12 V–48 V auxiliary supplies at full load and elevated temperature |
| Wettable flank leads | Supports automated X-ray and AOI inspection of solder fillets on production PCBs |
| ECOPACK3 compliance | Fully RoHS-compliant, halogen-free, and lead-free - meets latest automotive environmental mandates |
Applications
| Automotive DC-DC Converters | On-Board Charger (OBC) Auxiliary Supplies |
|---|---|
Use Scenario: 400 V–800 V battery-fed isolated DC-DC converter supplying 12 V/24 V for vehicle control modules. IC Role / Device Role / Timing Role: Free-wheeling diode in synchronous rectified forward or flyback topology. Use Value: 53 ns trr and 175 °C Tj rating ensure stable operation across -40 °C to +125 °C ambient with minimal switching loss. | Use Scenario: Auxiliary 12 V supply derived from OBC high-voltage DC bus for MCU, fans, and sensors. IC Role / Device Role / Timing Role: Output rectifier in 100–300 kHz resonant LLC stage. Use Value: Low VF (0.89 V) at 150 °C maintains efficiency >92% at full load and high junction temperature. |
| Engine Control Unit (ECU) Power Stage | Electric Power Steering (EPS) Gate Drive Protection |
Use Scenario: High-side switch snubber and clamp circuit in 12 V/24 V ECU main power distribution. IC Role / Device Role / Timing Role: Fast-recovery clamp diode protecting MOSFETs during inductive load switching. Use Value: 30 A IFSM and 53 ns trr suppress voltage spikes below 800 V, preventing device avalanche failure. | Use Scenario: Base-drive freewheel path for H-bridge gate drivers controlling EPS motor phases. IC Role / Device Role / Timing Role: Ultrafast base-drive return path ensuring clean turn-off of N-channel gate drivers. Use Value: Negligible reverse recovery charge (Qrr inferred <15 nC) prevents shoot-through in high-speed PWM gate drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR220SFT1G | Same SMB Flat package; VRRM = 200 V (not 800 V); trr = 35 ns; VF = 0.95 V @ 2 A, 25 °C | Only suitable for ≤200 V systems (e.g., 48 V EPS), not 400–800 V automotive HV domains | Select only if system reverse voltage ≤200 V and faster trr is prioritized over HV capability |
| Vishay V8P8M | 800 V VRRM, 2 A IF(AV), SMB package but non-wettable flanks; trr = 60 ns; VF = 0.93 V @ 150 °C | Lacks AEC-Q101 qualification and wettable flanks; not approved for automotive AOI-critical assembly | Acceptable for industrial 800 V supplies where automotive qualification and AOI are not required |
Compared with MUR220SFT1G and V8P8M, STTH208UFY uniquely combines 800 V rating, AEC-Q101 qualification, wettable flanks, and 53 ns trr-making it the only drop-in solution for thermally demanding, safety-critical automotive HV DC-DC and OBC auxiliary stages.
Availability
STTH208UFY is available at Aetrix Electronics and suitable for automotive DC-DC converters, on-board chargers, and electric power steering systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for STTH208UFY 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 microcontrollers, power devices, analog ICs, and sensors for automotive, industrial, and consumer markets.
The STTH-Y series targets high-reliability automotive power conversion, with STTH208UFY specifically engineered for ultrafast, high-temperature rectification in 400–800 V battery-connected systems.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The STTH208UFY has a maximum junction temperature (Tj) rating of 175 °C, verified per AEC-Q101 stress testing. This allows uninterrupted operation in under-hood environments up to 125 °C ambient when mounted on a PCB with ≥2 cm² of 35 µm copper per lead, as confirmed by Rth(j-a) curves in DS10083.
Is STTH208UFY pin-compatible with STTH208-Y?
Yes - STTH208UFY and STTH208-Y share identical SMB Flat mechanical footprint, pinout (anode/cathode), and electrical specifications. The "UFY" suffix denotes tape-and-reel packaging (5000 pcs) with wettable flanks; "Y" is the base part number used in datasheets and design references.
Does this diode require a heatsink in a 2 A, 100 kHz flyback design?
No external heatsink is required if PCB layout provides ≥2 cm² of 35 µm copper under each lead. With Rth(j-l) = 18 °C/W and Pcond ≈ 1.78 W (at 2 A, 150 °C), junction-to-ambient rise remains within limit using standard FR4 board copper as thermal path, per Figure 6 in DS10083.
How does the wettable flank feature impact assembly yield?
Wettable flanks enable reliable automated optical inspection (AOI) of solder fillet geometry on both sides of the lead, improving first-pass yield by >12% in high-volume automotive SMT lines - validated in ST's internal process qualification reports for SMB Flat ECOPACK3 devices.
STTH208UFY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK®2
- Package/Case:
- DO-221AA, SMB Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1.55 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
- Operating Temperature - Junction:
- -40°C ~ 175°C
STTH208UFY FAQ
1.How can I place an order for STTH208UFY through Aetrix?
Please submit a Request for Quotation (RFQ) for STTH208UFY 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 STTH208UFY reliable?
The price and inventory of STTH208UFY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH208UFY is usually 5 days.
3.What payment methods are accepted for STTH208UFY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH208UFY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTH208UFY?
STTH208UFY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTH208UFY 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 STTH208UFY?
For technical support, including STTH208UFY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH208UFY requirements.
6.How does Aetrix verify that STTH208UFY is sourced from the original manufacturer or authorized distributors?
All STTH208UFY 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 STTH208UFY meets industry standards.
7.What is the process for return or replacement of STTH208UFY?
All STTH208UFY units undergo pre-shipment inspection (PSI). If there is an issue with STTH208UFY, 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 STTH208UFY part is unused and in its original packaging.
Return procedure for STTH208UFY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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