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Taiwan Semiconductor Corporation SK34AHR3G
- Part No.:
- SK34AHR3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SK34AHR3G.pdf
- Description:
- DIODE SCHOTTKY 40V 3A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,922
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Product details
Overview
SK34AHR3G from Taiwan Semiconductor is a 40 V, 3 A surface-mount Schottky barrier rectifier in DO-214AC (SMA) package, featuring low forward voltage (0.55 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 SK34AHR3G datasheet, SK34AHR3G pinout, SK34AHR3G application, or SK34AHR3G equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 0.55 V forward voltage at rated current, 70 A IFSM, -55°C to +150°C operating junction temperature range, and DO-214AC mechanical compatibility with automated SMT assembly.
Technical Context
This Schottky rectifier uses a single-die construction with guard ring structure for over-voltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its low VF and high dV/dt rating (10,000 V/µs) support high-frequency switching in compact power supplies.
Thermal performance is defined by RθJL = 25°C/W and RθJA = 66°C/W, enabling reliable operation up to 150°C junction temperature under sustained 3 A DC load in standard PCB layouts with adequate copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum non-repetitive reverse blocking voltage; defines safe operating limit in reverse-biased applications like reverse battery protection. |
| IF | 3 A - Continuous forward current rating; supports stable DC/DC converter output stage conduction without derating at TA ≤ 75°C. |
| VF | 0.55 V @ 3 A, 25°C - Low conduction loss enables >92% efficiency in 5–12 V output buck converters at full load. |
| IFSM | 70 A - Peak non-repetitive surge current handling; withstands inrush and fault transients in automotive lighting circuits. |
| IR | 500 µA @ 40 V, 25°C - Low leakage preserves battery standby life in always-on vehicle modules. |
| TJ max | +150°C - Enables placement near heat sources (e.g., MOSFETs, inductors) in space-constrained automotive ECUs. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount plastic case with cathode band polarity marking, 0.070 g mass, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch-node in buck converter, battery negative in reverse protection). |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by band; ties to higher-potential rail (e.g., output capacitor positive, battery positive); blocks reverse current above 40 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood environments including thermal cycling, humidity, and vibration per stress test requirements. |
| Guard ring structure | Enhances edge termination robustness, improving VRRM consistency and reducing risk of premature avalanche failure. |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT lines without dry-pack handling. |
| Halogen-free & RoHS compliant | Meets EU Directive 2011/65/EU and IPC-1752A reporting standards for green electronics manufacturing. |
Applications
| Automotive LED Lighting | 12 V DC/DC Buck Converter |
|---|---|
Use Scenario: Powering headlamp or DRL modules with PWM dimming and cold-crank tolerance. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or asynchronous buck topology, conducting during low-side switch off-time. Use Value: 0.55 V VF minimizes conduction loss and thermal rise in confined headlamp housings. | Use Scenario: Secondary-side rectification in 12 V input, 3.3–5 V output industrial power supply. IC Role / Device Role / Timing Role: Output rectifier replacing fast recovery diodes to improve light-load efficiency and reduce EMI. Use Value: 70 A IFSM handles startup surges without derating; DO-214AC footprint simplifies layout reuse. |
| Reverse Battery Protection | Low-Voltage Inverter |
Use Scenario: Preventing damage when 12 V battery is connected with reversed polarity in telematics or infotainment units. IC Role / Device Role / Timing Role: Series-connected anode-to-battery-positive, cathode-to-system-rail; blocks reverse current above 40 V. Use Value: 500 µA IR at 25°C ensures negligible standby drain on backup supercapacitors or RTC circuits. | Use Scenario: High-frequency inverter stage in portable power tools or e-bike controllers. IC Role / Device Role / Timing Role: Freewheeling path for inductive motor drive currents during PWM dead-time intervals. Use Value: 10,000 V/µs dV/dt rating prevents false turn-on during fast-switching gate driver transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS34H from ON Semiconductor | Same VRRM (40 V), slightly higher VF (0.57 V typ.), identical DO-214AC package and 3 A rating. | No AEC-Q101 qualification; suitable for industrial but not automotive-critical designs. | Select SS34H only if automotive qualification is unnecessary and legacy ON BOM alignment is prioritized. |
| SB340 from Diodes Inc. | VRRM = 40 V, VF = 0.55 V (same), but IFSM = 60 A (14% lower) and no AEC-Q101 documentation confirmed. | Limited to non-safety-critical automotive subsystems where surge margin is less constrained. | Prefer SK34AHR3G where 70 A surge headroom and formal AEC-Q101 evidence are required. |
Compared with SS34H and SB340, SK34AHR3G provides verified AEC-Q101 compliance, 70 A surge rating, and tighter VF distribution-making it the preferred choice for automotive front-end power stages requiring long-term reliability under thermal and electrical stress.
Availability
SK34AHR3G is available at Aetrix Electronics and suitable for automotive LED lighting, 12 V DC/DC converters, reverse battery protection, and low-voltage inverters requiring stable component supply across production lifecycles.
Supply support for SK34AHR3G 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 semiconductor manufacturer specializing in discrete power devices, analog ICs, and optoelectronics, headquartered in Hsinchu, Taiwan.
The SK3xAH series was designed specifically for automotive and industrial surface-mount power conversion, emphasizing AEC-Q101 reliability, low-loss Schottky performance, and SMT process compatibility in DO-214AC packaging.
FAQ
What is the maximum junction temperature rating for SK34AHR3G?
The SK34AHR3G has a maximum junction temperature (TJ) of +150°C, validated per absolute maximum ratings in the official Taiwan Semiconductor datasheet Version B2304. This allows operation in under-hood automotive environments and near heat-generating components. Derating begins above 75°C ambient, and thermal design must ensure RθJA ≤ 66°C/W is maintained via PCB copper area and airflow. The SK34AHR3G remains fully functional across its full -55°C to +150°C junction range.
Is SK34AHR3G qualified for automotive applications?
Yes, SK34AHR3G is explicitly AEC-Q101 qualified per the Taiwan Semiconductor datasheet, confirming compliance with stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life. This qualification applies directly to the SK34AHR3G variant-not just the family-and supports use in automotive lighting, body control modules, and infotainment power supplies. The "R3G" suffix denotes green/halogen-free packaging aligned with automotive environmental requirements.
What does the "R3G" suffix mean in SK34AHR3G?
The "R3G" suffix in SK34AHR3G indicates RoHS-compliant, halogen-free, and green compound packaging per JEDEC standards, with moisture sensitivity level 1 (MSL-1) and matte tin-plated leads meeting J-STD-002 solderability. It is not a revision code or tape-and-reel indicator-the base part SK34AH is identical electrically and mechanically; R3G specifies the environmental and process-compatibility attributes required for modern automotive and industrial SMT lines.
What is the forward voltage of SK34AHR3G at 3 A and 100°C junction temperature?
The forward voltage (VF) of SK34AHR3G is not specified at 100°C in the published datasheet-only typical values at 25°C (0.55 V) and maximums at 125°C (no value given for SK34AH). However, based on the family's VF vs. TJ curve (Fig.4), VF decreases ~2 mV/°C; thus at 100°C, VF is approximately 0.41 V at 3 A. This lower VF improves efficiency in thermally stressed conditions but requires validation in final layout due to thermal coupling effects.
Does SK34AHR3G have a documented surge current rating for repetitive operation?
No-SK34AHR3G specifies only non-repetitive peak forward surge current (IFSM) of 70 A for a single 8.3 ms half-sine wave, per absolute maximum ratings. Repetitive surge capability is not characterized or guaranteed. For applications involving frequent current spikes (e.g., motor commutation), thermal cycling analysis and derating per Fig.11 must be performed. The SK34AHR3G is intended for occasional surge events, not continuous pulsed operation beyond its 3 A DC rating.
SK34AHR3G 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):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 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
SK34AHR3G FAQ
1.How can I place an order for SK34AHR3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SK34AHR3G 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 SK34AHR3G reliable?
The price and inventory of SK34AHR3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK34AHR3G is usually 5 days.
3.What payment methods are accepted for SK34AHR3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK34AHR3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK34AHR3G?
SK34AHR3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK34AHR3G 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 SK34AHR3G?
For technical support, including SK34AHR3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK34AHR3G requirements.
6.How does Aetrix verify that SK34AHR3G is sourced from the original manufacturer or authorized distributors?
All SK34AHR3G 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 SK34AHR3G meets industry standards.
7.What is the process for return or replacement of SK34AHR3G?
All SK34AHR3G units undergo pre-shipment inspection (PSI). If there is an issue with SK34AHR3G, 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 SK34AHR3G part is unused and in its original packaging.
Return procedure for SK34AHR3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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