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Taiwan Semiconductor Corporation SK35AHR3G
- Part No.:
- SK35AHR3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK35AHR3G.pdf
- Description:
- DIODE SCHOTTKY 50V 3A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,787
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Product details
Overview
SK35AHR3G from Taiwan Semiconductor is a 3 A, 50 V Schottky barrier rectifier in DO-214AC (SMA) package, optimized for high-frequency DC/DC conversion and reverse battery protection with low forward voltage (0.72 V at 3 A, 25°C) and low leakage (200 µA at 50 V, 25°C). It features AEC-Q101 qualification, guard ring over-voltage protection, and moisture sensitivity level 1.
For engineers reviewing the SK35AHR3G datasheet, SK35AHR3G pinout, SK35AHR3G application, or SK35AHR3G equivalent, this device is selected for automotive lighting, freewheeling diode roles in synchronous buck converters, and low-loss reverse polarity protection where thermal resistance (RθJL = 25°C/W) and surge capability (IFSM = 70 A) are critical.
Technical Context
The SK35AHR3G implements a single-die Schottky junction with platinum-silicide or similar barrier metallization, enabling fast switching (no minority-carrier storage) and low forward conduction loss. Its 50 V VRRM rating targets 12 V–24 V automotive and industrial bus systems.
Thermal performance is defined by RθJL = 25°C/W and RθJA = 66°C/W, supporting continuous 3 A operation up to 125°C junction temperature when mounted on standard PCB copper. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage; sets safe operating margin for 24 V nominal systems with transient spikes. |
| IF | 3 A - Continuous forward current rating; defines steady-state power delivery capacity in DC/DC output stages. |
| VF | 0.72 V max @ 3 A, 25°C - Low conduction loss enables >92% efficiency in 5–12 V buck converters at full load. |
| IR | 200 µA max @ 50 V, 25°C - Low leakage preserves battery life in always-on reverse protection circuits. |
| IFSM | 70 A - Peak non-repetitive surge current; withstands inrush and fault currents in automotive load dumps. |
| TJ max | 150°C - Maximum junction temperature; supports operation in under-hood environments with proper heatsinking. |
| RθJL | 25°C/W - Junction-to-lead thermal resistance; enables direct thermal path to PCB copper or heatsink via cathode lead. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount plastic case with matte tin-plated leads, cathode indicated by band. Weight: 0.070 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/bus side in freewheeling or reverse protection; requires low-inductance trace routing. |
| Cathode | Forward current exit / reverse blocking terminal | Primary thermal path to PCB; must be routed to ≥1 cm² of 2 oz copper for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test requirements including temperature cycling, HTRB, and ESD. |
| Guard ring structure | Enhances edge termination robustness, improving VRRM consistency and reducing risk of premature avalanche failure. |
| Moisture sensitivity level 1 | No bake preconditioning required before reflow; compatible with standard SMT assembly lines without dry pack handling. |
| Halogen-free & RoHS compliant | Meets EU Directive 2011/65/EU and IEC 61249-2-21; suitable for eco-sensitive industrial and automotive supply chains. |
Applications
| Automotive LED Lighting | DC/DC Converter Freewheeling Diode |
|---|---|
Use Scenario: High-brightness LED headlamp modules powered from 12 V battery with PWM dimming and transient suppression. IC Role / Device Role / Timing Role: Reverse polarity protection diode placed between battery input and DC/DC controller input. Use Value: Prevents damage during jump-start misconnection; 0.72 V VF minimizes voltage drop and thermal rise at 3 A peak load. | Use Scenario: 12 V to 5 V synchronous buck converter in infotainment power rail. IC Role / Device Role / Timing Role: Freewheeling (catch) diode in non-synchronous configuration or bootstrap path in high-side gate drive. Use Value: Fast recovery eliminates reverse recovery charge (Qrr ≈ 0), reducing switching losses and EMI in 300–500 kHz designs. |
| Reverse Battery Protection | Low-Voltage Inverter Output Stage |
Use Scenario: Industrial control module with removable battery backup requiring fail-safe polarity enforcement. IC Role / Device Role / Timing Role: Series-connected anode-in configuration blocking reverse current flow. Use Value: 200 µA max IR at 25°C ensures <1 µA standby drain; 70 A IFSM survives accidental short-circuit events. | Use Scenario: 24 V AC inverter driving small BLDC motors in HVAC actuators. IC Role / Device Role / Timing Role: Output rectification stage converting high-frequency square wave to unidirectional current. Use Value: Low VF and zero Qrr maintain efficiency above 90% at 3 A, reducing heatsink size and system cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS35HE3/5BT | Same 3 A / 50 V rating; VF = 0.75 V max; RθJA = 70°C/W vs. 66°C/W; no AEC-Q101 claim. | Not qualified for automotive; suitable for industrial/commercial DC/DC where qualification is not mandated. | Select SS35HE3/5BT for cost-sensitive non-automotive designs with relaxed thermal or reliability requirements. |
| SB350-TB | 3 A / 50 V; VF = 0.70 V typ; IR = 300 µA max @ 50 V, 25°C; no guard ring; MSL level 1 confirmed. | Higher leakage limits use in ultra-low-power battery hold-up; lacks AEC-Q101 and guard ring for harsh transients. | Choose SB350-TB only when lowest possible VF is prioritized over leakage and transient robustness. |
Compared with SS35HE3/5BT and SB350-TB, the SK35AHR3G uniquely combines AEC-Q101 qualification, guard ring protection, and 200 µA leakage-making it the preferred choice for automotive reverse battery and lighting applications demanding long-term reliability under thermal and electrical stress.
Availability
SK35AHR3G is available at Aetrix Electronics and suitable for automotive LED lighting, DC/DC converter freewheeling, and reverse battery protection requiring stable component supply across production lifecycles.
Supply support for SK35AHR3G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SK3xAH series was designed specifically for high-reliability, high-efficiency power conversion in automotive subsystems-emphasizing AEC-Q101 compliance, low thermal resistance, and robust surge immunity.
FAQ
What is the maximum junction temperature rating for SK35AHR3G?
The SK35AHR3G has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings in the official TSC datasheet revision B2304. This allows operation in under-hood automotive environments when thermal design accounts for RθJL = 25°C/W and board-level copper area. Derating curves confirm 3 A continuous current is sustainable up to 125°C ambient with adequate heatsinking.
Is SK35AHR3G pin-compatible with other SK3xAH variants?
Yes, all SK3xAH devices-including SK35AHR3G-share identical DO-214AC (SMA) package dimensions, lead finish, polarity marking, and mechanical footprint. The "x" denotes VRRM (20 V to 200 V), but pinout, thermal pad layout, and solder profile remain fully consistent across the family, enabling drop-in voltage-rating upgrades.
Does SK35AHR3G require special handling for moisture sensitivity?
No-SK35AHR3G is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and subjected to standard reflow profiles without baking or dry-pack requirements. This simplifies SMT line integration and reduces manufacturing overhead compared to higher-MSL discrete diodes.
What is the typical forward voltage of SK35AHR3G at 3 A and 100°C junction temperature?
While the datasheet specifies VF ≤ 0.72 V max at 3 A and 25°C, characteristic curves (Fig.4 and Fig.6) show typical VF increases to ~0.65 V at 100°C for SK35AH–SK36AH variants. This temperature-dependent reduction reflects improved carrier injection efficiency at elevated TJ, supporting stable performance in thermally stressed DC/DC output stages.
Can SK35AHR3G be used in place of a silicon PN rectifier in a 50 V, 3 A application?
Yes-SK35AHR3G replaces silicon PN rectifiers in 50 V, 3 A applications with measurable benefits: zero reverse recovery charge eliminates switching loss and EMI, 0.72 V VF cuts conduction loss by ~40% versus ~1.1 V for equivalent Si diodes, and its 70 A IFSM exceeds most 3 A PN parts. However, higher IR at elevated temperatures must be evaluated in high-impedance bias networks.
SK35AHR3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 720 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SK35AHR3G FAQ
1.How can I place an order for SK35AHR3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK35AHR3G 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 SK35AHR3G reliable?
The price and inventory of SK35AHR3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK35AHR3G is usually 5 days.
3.What payment methods are accepted for SK35AHR3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK35AHR3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK35AHR3G?
SK35AHR3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK35AHR3G 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 SK35AHR3G?
For technical support, including SK35AHR3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK35AHR3G requirements.
6.How does Aetrix verify that SK35AHR3G is sourced from the original manufacturer or authorized distributors?
All SK35AHR3G 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 SK35AHR3G meets industry standards.
7.What is the process for return or replacement of SK35AHR3G?
All SK35AHR3G units undergo pre-shipment inspection (PSI). If there is an issue with SK35AHR3G, 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 SK35AHR3G part is unused and in its original packaging.
Return procedure for SK35AHR3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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