Request Quote
(Ships tomorrow)
SK34BH Equivalent & Substitute Parts
Part Overview
The SK34BH is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 3A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Equivalent and substitute parts are identified based on matching or superior electrical characteristics within the same package family, enabling design flexibility, supply chain optimization, and component availability management.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 40 | V |
| Current - Average Rectified (Io) | 3 | A |
| Voltage - Forward (Vf) (Max) @ If | 500 mV @ 3 A | mV |
| Speed | Fast Recovery ≤ 500ns, > 200mA (Io) | ns |
| Current - Reverse Leakage @ Vr | 500 | µA @ 40 V |
| Technology | Schottky | |
| Package / Case | DO-214AA, SMB | |
| Mounting Type | Surface Mount | |
| Operating Temperature - Junction | -55 to 125 | °C |
| Grade | Automotive | |
| Qualification | AEC-Q101 | |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the SK34BH is determined by the following critical parameters:
Voltage Rating: All substitute parts must maintain a maximum DC reverse voltage (Vr) of 40V or greater to ensure equivalent or superior voltage withstand capability.
Current Rating: Substitute parts must support an average rectified current (Io) of 3A or greater. Parts rated below 3A are considered similar but not direct equivalents due to reduced current capacity.
Package Compatibility: The primary substitute (SK34B) shares the identical DO-214AA (SMB) package. Similar parts from Diodes Incorporated and Vishay may utilize the same package footprint with compatible pinout and mounting characteristics.
Technology: All identified substitutes employ Schottky diode technology, maintaining fast recovery characteristics (≤500ns, >200mA).
Forward Voltage: Substitute parts with forward voltage (Vf) at or below 500 mV @ 3A are electrically compatible. Parts with lower Vf values (450 mV) offer improved efficiency characteristics.
Reverse Leakage: Substitute parts with reverse leakage current at or below 500 µA @ 40V maintain equivalent or superior leakage performance.
Automotive Qualification: Parts bearing AEC-Q101 qualification are suitable for automotive applications matching the SK34BH grade classification.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) @ If [mV] | Reverse Leakage @ Vr [µA] | Package | Temp Range [°C] | AEC-Q101 |
|---|---|---|---|---|---|---|---|---|
| SK34BH | Taiwan Semiconductor Corporation | 40 | 3 | 500 @ 3A | 500 @ 40V | DO-214AA (SMB) | -55 to 125 | Yes |
| SK34B | Good-Ark Semiconductor | 40 | 3 | 550 @ 3A | 200 @ 40V | DO-214AA (SMB) | -55 to 150 | Yes |
| B340BQ-13-F | Diodes Incorporated | 40 | 3 | 500 @ 3A | 500 @ 40V | DO-214AA (SMB) | -55 to 150 | Yes |
| B340LB-E3/52T | Vishay General Semiconductor - Diodes Division | 40 | 3 | 450 @ 3A | 400 @ 40V | DO-214AA (SMB) | -65 to 150 | No |
| B340LB-E3/5BT | Vishay General Semiconductor - Diodes Division | 40 | 3 | 450 @ 3A | 400 @ 40V | DO-214AA (SMB) | -65 to 150 | No |
| B340LB-M3/5BT | Vishay General Semiconductor - Diodes Division | 40 | 3 | 450 @ 3A | 400 @ 40V | DO-214AA (SMB) | -65 to 150 | No |
| B240Q-13-F | Diodes Incorporated | 40 | 2 | 500 @ 2A | 500 @ 40V | DO-214AA (SMB) | -65 to 150 | Yes |
| CDBB140-HF | Comchip Technology | 40 | 1 | 500 @ 1A | 500 @ 40V | DO-214AA (SMB) | -50 to 175 | No |
Engineering Selection Recommendations
Direct Equivalent (3A Rating):
The SK34B (Good-Ark Semiconductor) is the primary parametric equivalent, offering identical voltage and current ratings with superior reverse leakage performance (200 µA versus 500 µA). Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. The SK34B extends the operating temperature range to 150°C, providing enhanced thermal margin. This part is suitable for direct substitution in applications where the SK34BH is specified.
The B340BQ-13-F (Diodes Incorporated) provides electrical equivalence with matching voltage, current, and forward voltage characteristics. AEC-Q101 qualification and ROHS3 compliance are maintained. This part is available in Tape & Reel packaging, matching the SK34BH supply format.
Enhanced Performance Alternative (3A Rating):
The B340LB-E3/52T, B340LB-E3/5BT, and B340LB-M3/5BT (Vishay General Semiconductor - Diodes Division) offer superior forward voltage performance at 450 mV versus 500 mV, resulting in reduced power dissipation. Reverse leakage is also improved at 400 µA. These parts lack AEC-Q101 qualification but maintain ROHS3 compliance and extended temperature range (-65 to 150°C). Selection of these parts requires confirmation that automotive qualification is not a mandatory design requirement.
Reduced Current Rating (2A Rating):
The B240Q-13-F (Diodes Incorporated) is rated for 2A average rectified current, below the 3A specification of the SK34BH. This part is suitable only for applications where the actual circuit current demand does not exceed 2A. AEC-Q101 qualification and ROHS3 compliance are maintained.
Lower Current Rating (1A Rating):
The CDBB140-HF (Comchip Technology) is rated for 1A average rectified current and is suitable only for applications with maximum circuit current of 1A or less. This part lacks AEC-Q101 qualification.
Frequently Asked Questions (FAQ)
Q: Can the SK34B replace the SK34BH in all applications?
A: The SK34B is a direct parametric equivalent with identical voltage (40V) and current (3A) ratings. Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. The SK34B offers superior reverse leakage performance and extended temperature range. Substitution is valid for all applications where the SK34BH is specified.
Q: What is the difference between the SK34BH and B340BQ-13-F?
A: Both parts share identical electrical specifications: 40V reverse voltage, 3A current rating, and 500 mV forward voltage at 3A. Both carry AEC-Q101 qualification and ROHS3 compliance. The primary difference is manufacturer (Taiwan Semiconductor Corporation versus Diodes Incorporated). Both are suitable for direct substitution.
Q: Why do the Vishay B340LB series parts show lower forward voltage?
A: The B340LB series (450 mV @ 3A) demonstrates improved forward voltage performance compared to the SK34BH (500 mV @ 3A). This represents a manufacturing or design variation between suppliers. Lower forward voltage results in reduced power dissipation and improved efficiency. These parts lack AEC-Q101 qualification, which may be a limiting factor in automotive applications.
Q: Can I use the B240Q-13-F as a substitute for the SK34BH?
A: The B240Q-13-F is rated for 2A average rectified current, which is below the SK34BH specification of 3A. This part is suitable only if the actual circuit current requirement does not exceed 2A. Using an undersized current rating in a 3A application creates risk of component failure.
Q: Are all substitute parts available in the same DO-214AA (SMB) package?
A: All substitute parts listed in this reference are available in the DO-214AA (SMB) package, ensuring mechanical and electrical compatibility with the SK34BH footprint. Packaging format (Tape & Reel versus Cut Tape) may vary by supplier and part number variant.
Q: What does AEC-Q101 qualification mean for automotive applications?
A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this qualification have undergone testing and validation for automotive use. The SK34BH and several substitute parts (SK34B, B340BQ-13-F, B240Q-13-F) carry this qualification. Parts without AEC-Q101 qualification may not be acceptable for automotive applications depending on design requirements and customer specifications.
Q: How does reverse leakage current affect component selection?
A: Reverse leakage current is the small current that flows through the diode when reverse biased. Lower reverse leakage indicates better diode quality and reduced power loss. The SK34BH specifies 500 µA @ 40V. The SK34B offers superior performance at 200 µA, while Vishay parts offer 400 µA. In low-power or precision applications, lower reverse leakage may be advantageous.
Q: Can I substitute a part with higher voltage rating (e.g., 60V) for the 40V SK34BH?
A: Higher voltage ratings are not included in this reference. Substitution is based on matching or superior electrical characteristics within the specified parameters. Parts with higher voltage ratings would require separate evaluation and are not addressed in this equivalent parts listing.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts