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Taiwan Semiconductor Corporation SK34BH
- Part No.:
- SK34BH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK34BH.pdf
- Description:
- DIODE SCHOTTKY 40V 3A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,860
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Product details
Overview
SK34BH from Taiwan Semiconductor is a 40 V, 3 A surface-mount Schottky barrier rectifier in DO-214AA (SMB) package, featuring low forward voltage (0.75 V max at 3 A, 25°C), 70 A surge capability, 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 SK34BH datasheet, SK34BH pinout, SK34BH application, or SK34BH equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 150°C maximum junction temperature, guard-ring overvoltage protection, and moisture sensitivity level 1 compliance - all critical for high-reliability 12 V/24 V automotive power rails.
Technical Context
The SK34BH uses a single-die Schottky structure optimized for low VF and fast switching, with no recovery time and minimal reverse recovery charge. Its guard ring design enhances ruggedness against transient overvoltage events common in automotive load-dump conditions.
Thermally, it delivers RθJL = 23°C/W and RθJA = 63°C/W, enabling sustained 3 A conduction at ambient temperatures up to 85°C without forced airflow - validated under JESD22-A108 thermal cycling and JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports 24 V nominal automotive systems with ≥2× safety margin against ISO 7637-2 pulse 5a (load dump) |
| IF | 3 A continuous - sufficient for mid-power LED drivers and auxiliary DC/DC stages |
| VF (max) | 0.75 V @ 3 A, 25°C - reduces conduction loss by ~30% vs. comparable 40 V Si diodes |
| IFSM | 70 A @ 8.3 ms - withstands cold-crank surges and motor commutation spikes |
| TJ(max) | 150°C - enables operation in engine-bay environments with minimal derating |
| IR (max) | 100 µA @ 40 V, 25°C - ensures low leakage in battery-sensitive reverse-protection circuits |
| dV/dt | 10,000 V/µs - prevents false turn-on during fast-switching transients in SMPS |
Pinout & Package
DO-214AA (SMB) surface-mount package: molded plastic body per UL 94V-0, matte tin-plated leads solderable per J-STD-002, cathode indicated by band. Weight ≈ 0.100 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point | Connected to input/source side (e.g., battery positive or switch-node) |
| Cathode | Current exit point | Connected to ground or return path; marked by visible band on package |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, and mechanical stress profiles per JEDEC standards |
| Guard ring structure | Prevents edge breakdown at rated VRRM, improving long-term reliability under voltage transients |
| Moisture sensitivity level 1 | No bake requirement before reflow; compatible with standard SMT assembly lines |
| High surge current capability | 70 A non-repetitive peak supports robustness against inductive kickback in motor control |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Reverse Battery Protection | DC/DC Converter Freewheeling Diode |
|---|---|
Use Scenario: Prevents damage when vehicle battery is connected with reversed polarity during service or jump-starting. IC Role / Device Role / Timing Role: Unidirectional current blocking element placed in series with main power rail. Use Value: 40 V VRRM and 150°C TJ(max) ensure fail-safe operation across extended temperature ranges and load-dump events. | Use Scenario: Provides low-loss current path during MOSFET off-time in buck or boost converters powering infotainment or ADAS modules. IC Role / Device Role / Timing Role: Freewheeling diode conducting during inductor discharge phase. Use Value: 0.75 V VF minimizes conduction loss, directly improving converter efficiency at 3 A output currents. |
| LED Headlamp Driver Output Stage | 12 V Auxiliary Power Rail Protection |
Use Scenario: Isolates LED string from supply fluctuations and protects against back-EMF during PWM dimming transitions. IC Role / Device Role / Timing Role: Output rectifier and polarity safeguard in constant-current LED driver stage. Use Value: 70 A IFSM handles PWM-induced current spikes; low VF reduces thermal load on heatsink-limited headlamp assemblies. | Use Scenario: Secures power integrity for telematics, camera modules, and sensors fed from shared 12 V bus. IC Role / Device Role / Timing Role: Reverse-polarity and transient-blocking diode upstream of LDOs or PMICs. Use Value: Guard ring + AEC-Q101 qualification ensures immunity to ISO 16750-2 electrical disturbances and 10-year field life. |
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-3EYH04-M3/54 | Same 40 V VRRM, 3 A IF, but higher VF (0.82 V typ), DO-214AA package | Slightly lower efficiency in high-duty-cycle DC/DC; identical mounting footprint | Acceptable where thermal margin exists and cost sensitivity favors Vishay's volume pricing |
| ON Semiconductor SB340-T | 40 V VRRM, 3 A IF, VF = 0.55 V (typ) at 3 A, but only rated to 125°C TJ(max) | Better conduction loss, but limited to under-hood locations with lower ambient exposure | Preferred for cabin-mounted modules where junction temperature stays below 125°C |
Compared with VS-3EYH04-M3/54 and SB340-T, the SK34BH offers the best balance of low VF, 150°C rating, and AEC-Q101 validation - making it optimal for engine-compartment DC/DC and reverse-battery protection where thermal and reliability margins are tight.
Availability
SK34BH is available at Aetrix Electronics and suitable for automotive reverse battery protection, DC/DC converter freewheeling, and LED headlamp driver applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for SK34BH 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 Company (TSC) is a vertically integrated Taiwanese manufacturer specializing in discrete power semiconductors, including Schottky, Zener, and TVS devices, with global distribution and AEC-Q certified production lines.
The SK3xBH family was designed specifically for automotive and industrial 12–24 V power systems demanding high surge robustness, low forward drop, and guaranteed reliability under harsh thermal and electrical stress.
FAQ
What is the maximum junction temperature rating for SK34BH?
The SK34BH has a maximum junction temperature (TJ) rating of 150°C, verified per AEC-Q101 stress testing. This allows uninterrupted operation in engine-bay environments where ambient temperatures reach 105°C, provided thermal design maintains junction temperature ≤150°C. The SK34BH datasheet specifies derating curves confirming 3 A continuous current is sustainable up to 85°C ambient with standard PCB copper area.
Is SK34BH pin-compatible with other parts in the SK3xBH series?
Yes, all SK3xBH variants - including SK32BH through SK320BH - share identical DO-214AA (SMB) package dimensions, anode/cathode terminal layout, and polarity marking. The SK34BH can be substituted for any other SK3xBH part on the same footprint without PCB modification, though voltage and thermal parameters must be verified for the target application.
Does SK34BH meet automotive qualification standards?
Yes, the SK34BH is explicitly AEC-Q101 qualified per the manufacturer's documentation. This includes stress tests for temperature cycling, high-temperature operating life, humidity bias, and mechanical shock - all performed on the exact SK34BH lot configuration. Certification applies to the full SK3xBH family, with test reports available upon request for SK34BH.
What is the forward voltage specification for SK34BH at elevated temperature?
The SK34BH forward voltage (VF) is specified as ≤0.75 V at 3 A and 25°C. At 100°C junction temperature, VF decreases to approximately 0.62 V due to Schottky's negative temperature coefficient - a key advantage over silicon diodes. This behavior is confirmed in Figure 4 (Typical Forward Characteristics) of the SK32BH–SK320BH datasheet.
How is polarity indicated on the SK34BH package?
Polarity on the SK34BH is indicated by a distinct cathode band printed on the molded plastic body of the DO-214AA (SMB) package. This band aligns with the cathode terminal and must be oriented toward the circuit's lower potential side (e.g., ground or return path). The marking diagram in the datasheet confirms "GYWF" coding format with cathode band placement per JEDEC DO-214AA standards.
SK34BH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 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-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 125°C
SK34BH FAQ
1.How can I place an order for SK34BH through Aetrix?
Please submit a Request for Quotation (RFQ) for SK34BH 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 SK34BH reliable?
The price and inventory of SK34BH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK34BH is usually 5 days.
3.What payment methods are accepted for SK34BH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK34BH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK34BH?
SK34BH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK34BH 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 SK34BH?
For technical support, including SK34BH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK34BH requirements.
6.How does Aetrix verify that SK34BH is sourced from the original manufacturer or authorized distributors?
All SK34BH 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 SK34BH meets industry standards.
7.What is the process for return or replacement of SK34BH?
All SK34BH units undergo pre-shipment inspection (PSI). If there is an issue with SK34BH, 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 SK34BH part is unused and in its original packaging.
Return procedure for SK34BH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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