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STMicroelectronics STTH102AY
- Part No.:
- STTH102AY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
STTH102AY.pdf
- Description:
- DIODE GEN PURP 200V 1A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:27,860
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Product details
Overview
STTH102AY from STMicroelectronics is an automotive-grade ultrafast recovery silicon rectifier diode in SMA (DO-214AC) package, rated for 200 V repetitive peak reverse voltage, 1 A average forward current, and 20 ns maximum reverse recovery time. It serves as a freewheeling or base-drive diode in automotive power switching circuits including DC-DC converters and motor control modules.
For engineers reviewing the STTH102AY datasheet, STTH102AY pinout, STTH102AY application, or STTH102AY equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C max junction temperature, low 0.78 V forward voltage at 1 A/125 °C, negligible switching losses, and ECOPACK®2 compliance for automotive-grade reliability.
Technical Context
The STTH102AY employs ST's planar 200 V technology to achieve ultrafast soft recovery with trr ≤ 20 ns at IF = 0.5 A, Irr = 0.25 A, and VR = 1 V. Its dV/dt rating of 10,000 V/µs ensures robustness against voltage transients in high-frequency switching environments.
Thermal performance is defined by Rth(j-l) = 30 °C/W and Tj(max) = 175 °C, enabling operation in under-hood automotive ambient conditions up to 125 °C with appropriate PCB copper area. Reverse leakage remains ≤25 µA at 125 °C and VRRM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Withstands repetitive reverse voltage spikes in 12 V/24 V automotive power rails without breakdown. |
| IF(AV) | 1 A at TL = 148 °C - Sustains continuous forward conduction in compact surface-mount power stages. |
| trr (max) | 20 ns - Enables >1 MHz switching in SMPS while minimizing commutation loss and EMI generation. |
| VF (max) | 0.78 V at IF = 1 A, Tj = 125 °C - Reduces conduction loss to <0.8 W at rated current, easing thermal design. |
| Tj (max) | 175 °C - Supports placement near heat sources (e.g., MOSFETs, inductors) in engine-control units. |
| dV/dt | 10,000 V/µs - Resists false triggering during fast voltage transients in inductive load switching. |
| Rth(j-l) | 30 °C/W - Allows direct thermal path to PCB copper, supporting ≥1.4 cm² pad area per lead for stable operation. |
Pinout & Package
STTH102AY uses the SMA (JEDEC DO-214AC) surface-mount package: molded epoxy body, cathode band marking, lead-free terminations, UL94 V0 rated, and footprint optimized for automated assembly on FR4 PCBs with 35 µm Cu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to switch node (e.g., MOSFET drain) in freewheeling configuration; must handle surge current up to 40 A (10 ms). |
| Cathode (K) | Forward current exit / reverse blocking terminal | Connected to rail (e.g., ground or input supply); carries full IF(AV) and defines polarity-sensitive layout orientation via band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast soft recovery | trr ≤ 20 ns with low IRM and Qrr - minimizes voltage overshoot and ringing during turn-off in inductive circuits. |
| AEC-Q101 qualified | Validated for automotive temperature cycling, HTRB, and ESD stress - suitable for safety-critical power modules without additional qualification. |
| High junction temperature rating | Tj(max) = 175 °C - enables use in high-ambient zones (e.g., near engine blocks or power inverters) without derating. |
| Low forward voltage | VF = 0.68 V (typ.) at 1 A/125 °C - reduces I²R loss and improves efficiency in 12 V battery-fed systems. |
| ECOPACK®2 compliance | Lead-free, halogen-free, RoHS-compliant construction - meets global automotive environmental mandates without sacrificing reliability. |
Applications
| Automotive DC-DC Converters | Engine Control Unit (ECU) Power Supplies |
|---|---|
Use Scenario: Step-down conversion from 12 V/24 V battery to 5 V/3.3 V logic rails in start-stop systems. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or quasi-resonant buck topologies operating at 200–500 kHz. Use Value: 20 ns trr and soft recovery suppress output voltage spikes, reducing need for snubbers and improving EMC performance. | Use Scenario: Auxiliary power supply for microcontroller, sensors, and CAN transceivers in under-hood ECUs. IC Role / Device Role / Timing Role: Output rectifier in flyback or forward converter delivering up to 1 A at 5 V. Use Value: 175 °C Tj(max) and AEC-Q101 qualification ensure uninterrupted operation during prolonged high-temperature soak tests (125 °C ambient). |
| Electric Power Steering (EPS) Motor Drivers | Automotive LED Headlamp Drivers |
Use Scenario: Clamping and energy recirculation in H-bridge gate-drive circuits powering 3-phase EPS motors. IC Role / Device Role / Timing Role: Base-drive clamp diode protecting N-channel MOSFET gates from inductive kickback during PWM switching. Use Value: 10,000 V/µs dV/dt rating prevents spurious turn-on during fast gate transitions, enhancing driver robustness. | Use Scenario: Constant-current regulation and overvoltage protection in multi-string LED drivers for adaptive headlamps. IC Role / Device Role / Timing Role: Freewheeling path for inductor current during PWM dimming cycles at 1–10 kHz. Use Value: Low VF and negligible switching loss maintain >92% efficiency across 0–100% duty cycle, reducing thermal load on LED heatsinks. |
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 MUR120 | Same 200 V VRRM and 1 A IF(AV), but trr = 35 ns (max), VF = 0.95 V (max) at 1 A/25 °C, not AEC-Q101 qualified. | Limited to non-automotive industrial supplies; lacks automotive temperature and reliability validation. | Acceptable for cost-sensitive non-automotive designs where trr < 35 ns suffices and AEC-Q101 is not mandated. |
| Vishay VS-1EWH02-M3/5AT | 200 V VRRM, 1 A IF(AV), trr = 18 ns (typ.), VF = 0.75 V (typ.) at 1 A/125 °C, AEC-Q101 qualified, same SMA package. | Direct functional replacement with tighter trr distribution and lower typical VF, but higher unit cost. | Preferred when optimizing for lowest conduction loss and highest switching fidelity in premium automotive modules. |
Compared with MUR120 and VS-1EWH02-M3/5AT, the STTH102AY offers balanced trade-offs: AEC-Q101 compliance and 20 ns trr at lower cost than Vishay's offering, while outperforming ON Semi's part in automotive reliability and high-temperature VF stability.
Availability
STTH102AY is available at Aetrix Electronics and suitable for automotive DC-DC converters, engine control unit (ECU) power supplies, and electric power steering (EPS) motor drivers requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for STTH102AY 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 analog, power, MCU, sensor, and automotive ICs for industrial, consumer, and automotive markets.
The STTH series targets high-efficiency, high-reliability power rectification in automotive and industrial switching applications, emphasizing ultrafast recovery, high-temperature operation, and environmental compliance.
FAQ
Is STTH102AY suitable for synchronous rectification?
No. STTH102AY is a unidirectional silicon PN junction diode with fixed forward conduction and reverse blocking behavior. It lacks gate control and cannot be actively switched like a MOSFET. It is intended for passive freewheeling or clamping roles in non-synchronous topologies.
What is the minimum recommended PCB copper area for thermal management?
Per Figure 10 in the datasheet, a minimum of 1.4 cm² of 35 µm-thick copper per lead (anode and cathode) is recommended to achieve Rth(j-a) ≈ 120 °C/W. Larger copper areas further reduce thermal resistance and improve power handling at elevated ambient temperatures.
Does STTH102AY have a specified reverse recovery charge (Qrr)?
Yes. Figure 8 shows Qrr versus dIF/dt, with typical values ranging from ~7 nC at 10 A/µs to ~25 nC at 1000 A/µs (Tj = 25 °C, IF = 1 A, VR = 100 V). At dIF/dt = 200 A/µs, Qrr is approximately 15 nC - critical for calculating switching loss in hard-switched converters.
Can STTH102AY replace STTH1L06 in the same footprint?
No. STTH1L06 uses the SOD-123FL package (smaller, lower thermal mass), while STTH102AY uses SMA (DO-214AC), which has larger dimensions (E = 4.8–5.35 mm vs. ~2.7 mm) and different pad layout. Mechanical interference and solder joint reliability would be compromised if substituted without board revision.
STTH102AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Q
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 970 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 20 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -40°C ~ 175°C
STTH102AY FAQ
1.How can I place an order for STTH102AY through Aetrix?
Please submit a Request for Quotation (RFQ) for STTH102AY 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 STTH102AY reliable?
The price and inventory of STTH102AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH102AY is usually 5 days.
3.What payment methods are accepted for STTH102AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH102AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTH102AY?
STTH102AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTH102AY 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 STTH102AY?
For technical support, including STTH102AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH102AY requirements.
6.How does Aetrix verify that STTH102AY is sourced from the original manufacturer or authorized distributors?
All STTH102AY 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 STTH102AY meets industry standards.
7.What is the process for return or replacement of STTH102AY?
All STTH102AY units undergo pre-shipment inspection (PSI). If there is an issue with STTH102AY, 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 STTH102AY part is unused and in its original packaging.
Return procedure for STTH102AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STTH102AY Tags
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