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Taiwan Semiconductor Corporation SK39AHR3G
- Part No.:
- SK39AHR3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK39AHR3G.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,846
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Product details
Overview
SK39AHR3G from Taiwan Semiconductor is a 3 A, 90 V Schottky barrier rectifier in DO-214AC (SMA) package, featuring low forward voltage (0.85 V at 3 A, 25°C), high surge current capability (70 A), and AEC-Q101 qualification for automotive-grade reliability. It serves as a freewheeling or reverse-battery protection diode in DC/DC converters and car lighting systems.
For engineers reviewing the SK39AHR3G datasheet, SK39AHR3G pinout, SK39AHR3G application, or SK39AHR3G equivalent, key selection criteria include its 90 V repetitive peak reverse voltage, 0.85 V forward drop at rated current, 10,000 V/µs dV/dt rating, junction temperature range (–55°C to +150°C), and moisture sensitivity level 1 compliance.
Technical Context
The SK39AHR3G is a single-die, unidirectional Schottky rectifier optimized for high-frequency, low-loss operation in automotive and industrial power conversion. Its guard ring structure provides over-voltage protection, and its matte tin-plated leads ensure reliable solderability per J-STD-002.
Thermally, it delivers RθJL = 25°C/W and RθJA = 66°C/W, enabling stable 3 A continuous conduction at elevated ambient temperatures when properly mounted on PCB copper. Reverse leakage remains ≤100 µA at 25°C and ≤0.5 mA at 125°C under full-rated 90 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum non-repetitive reverse blocking voltage; defines safe operating limit in flyback or clamp circuits |
| IF | 3 A - Continuous forward current rating at TL = 75°C; determines minimum trace width and thermal pad area |
| VF | 0.85 V @ 3 A, 25°C - Low conduction loss enables >92% efficiency in 12 V input DC/DC stages |
| IFSM | 70 A - Peak surge current (8.3 ms half-sine); supports cold-crank and load-dump transient immunity |
| dV/dt | 10,000 V/µs - High critical rate of rise tolerance prevents false turn-on in fast-switching inverters |
| TJ max | +150°C - Enables operation in under-hood automotive environments without derating below 3 A |
| MSL | Level 1 (per J-STD-020) - No floor life limitation; suitable for standard SMT reflow without dry-pack handling |
Pinout & Package
Package: DO-214AC (SMA), surface-mount plastic case with cathode band polarity marking; dimensions per JEDEC DO-214AC, weight ≈ 0.070 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch-node ground return or battery negative) |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by band; ties to higher-potential rail (e.g., output rail or battery positive) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and body electronics |
| Guard ring structure | Enhances ruggedness against transient overvoltage events without external snubbers |
| Low IR at high TJ | ≤0.5 mA at 125°C and 90 V reverse bias - minimizes standby power loss in always-on modules |
| Halogen-free & RoHS compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements |
| High IFSM/IF ratio (23:1) | Supports robust start-up sequencing and fault-current handling in 12 V/24 V systems |
Applications
| Automotive LED Headlamp Driver | 12 V Automotive DC/DC Buck Converter |
|---|---|
Use Scenario: High-side synchronous buck regulator supplies constant current to multi-string LED arrays in headlamps. IC Role / Device Role / Timing Role: Freewheeling diode during low-side switch off-time; clamps inductive kickback from output choke. Use Value: 0.85 V VF reduces conduction loss by ~18% vs. comparable 100 V Si diodes, improving thermal margin at 3 A peak. | Use Scenario: 12 V input to 5 V/3.3 V point-of-load converter powering infotainment microcontrollers. IC Role / Device Role / Timing Role: Output rectifier in asynchronous buck topology; conducts during high-side MOSFET off-phase. Use Value: 70 A IFSM withstands cold-crank surges down to –30°C without degradation, ensuring startup reliability. |
| Reverse Battery Protection Circuit | Low-Voltage Inverter for HVAC Blower Motor |
Use Scenario: Series-connected diode blocks reverse polarity connection during service or jump-start attempts. IC Role / Device Role / Timing Role: Unidirectional current path placed between battery terminal and main power distribution board. Use Value: 90 V VRRM exceeds 24 V system's worst-case load dump (ISO 7637-2 Pulse 5a), eliminating need for additional TVS. | Use Scenario: Half-bridge inverter drives 12 V blower motor with PWM frequencies up to 20 kHz. IC Role / Device Role / Timing Role: Anti-parallel freewheeling diode across each IGBT or MOSFET switch. Use Value: 10,000 V/µs dV/dt rating prevents spurious conduction during fast 600 V/ns switching edges in compact motor drive layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-3EYH09-M3/54 | Same 90 V VRRM, 3 A IF, but VF = 0.82 V @ 3 A; slightly lower RθJA (60°C/W) | Identical DO-214AC footprint; tighter VF tolerance (±0.03 V vs. ±0.05 V) | Preferred where <0.05 V VF reduction justifies dual-source qualification |
| ON Semiconductor SB390 | 90 V VRRM, 3 A IF, but VF = 0.88 V @ 3 A; IFSM = 60 A; not AEC-Q101 qualified | DO-214AC compatible; lacks automotive stress validation and MSL1 assurance | Suitable for cost-sensitive industrial DC/DC where AEC-Q101 is not mandated |
Compared with VS-3EYH09-M3/54 and SB390, the SK39AHR3G offers the only combination of AEC-Q101 qualification, 70 A surge rating, and MSL1 handling - making it the default choice for Tier-1 automotive power modules requiring zero rework risk and long-term supply stability.
Availability
SK39AHR3G is available at Aetrix Electronics and suitable for automotive LED drivers, 12 V/24 V DC/DC converters, and reverse battery protection circuits requiring stable component supply across multi-year production programs.
Supply support for SK39AHR3G 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 SK32AH–SK320AH family was designed specifically for high-reliability, high-efficiency rectification in automotive power systems - emphasizing AEC-Q101 compliance, low VF consistency across temperature, and robust surge survivability.
FAQ
What is the maximum junction temperature rating for SK39AHR3G?
The SK39AHR3G has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table. This allows uninterrupted 3 A operation in under-hood environments up to +105°C ambient when mounted on ≥1 cm² of 2-oz copper with thermal vias. The SK39AHR3G maintains parametric stability across its full –55°C to +150°C junction range.
Is SK39AHR3G suitable for reverse battery protection in 24 V commercial vehicles?
Yes, the SK39AHR3G is suitable for reverse battery protection in 24 V systems. Its 90 V VRRM exceeds ISO 7637-2 Pulse 5a load dump peaks (up to 75 V), and its AEC-Q101 qualification ensures validated performance under vibration, thermal cycling, and humidity stress. The SK39AHR3G's 70 A IFSM also handles cranking surges without degradation.
Does SK39AHR3G have a halogen-free and RoHS-compliant construction?
Yes, the SK39AHR3G uses halogen-free molding compound and meets RoHS Directive 2011/65/EU requirements. This is explicitly stated in the "Features" section of the official datasheet (Version B2304), and the device carries the "G" suffix in its ordering code to denote green compound compliance.
What is the forward voltage of SK39AHR3G at 3 A and 125°C junction temperature?
The forward voltage of SK39AHR3G is not specified at 125°C in the provided datasheet. However, typical VF increases ~2.2 mV/°C above 25°C. Using the 25°C value of 0.85 V and linear extrapolation, VF at 125°C is approximately 1.07 V. For design-critical applications, the SK39AHR3G should be characterized in-system or referenced against Figure 10 (Typical Forward Characteristics) for SK39–SK310AH curves.
How does the guard ring feature in SK39AHR3G improve reliability?
The guard ring in SK39AHR3G enhances edge termination robustness, preventing premature avalanche breakdown at the die periphery during voltage transients. This improves long-term reliability in automotive applications subject to load dump and inductive switching noise. The guard ring directly contributes to the SK39AHR3G's ability to sustain 10,000 V/µs dV/dt without failure - a key differentiator versus non-guarded Schottky rectifiers.
SK39AHR3G 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):
- 90 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 850 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 90 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
SK39AHR3G FAQ
1.How can I place an order for SK39AHR3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK39AHR3G 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 SK39AHR3G reliable?
The price and inventory of SK39AHR3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK39AHR3G is usually 5 days.
3.What payment methods are accepted for SK39AHR3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK39AHR3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK39AHR3G?
SK39AHR3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK39AHR3G 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 SK39AHR3G?
For technical support, including SK39AHR3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK39AHR3G requirements.
6.How does Aetrix verify that SK39AHR3G is sourced from the original manufacturer or authorized distributors?
All SK39AHR3G 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 SK39AHR3G meets industry standards.
7.What is the process for return or replacement of SK39AHR3G?
All SK39AHR3G units undergo pre-shipment inspection (PSI). If there is an issue with SK39AHR3G, 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 SK39AHR3G part is unused and in its original packaging.
Return procedure for SK39AHR3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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