SMB5819 Equivalent & Substitute Parts

Part Overview

The SMB5819 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SMB5819 operates across a junction temperature range of -55°C to 125°C and exhibits fast recovery characteristics suitable for switching applications.

Substiute Parts

SMB5819

Micro Commercial CoIn Stock: 672SMB5819 Datasheet

Current PartRFQ

SK14-TP (SMB5819)

Micro Commercial CoIn Stock: 726SK14-TP (SMB5819) Datasheet

Parametric EquivalentRFQ

STPS340S

STMicroelectronicsIn Stock: 50815STPS340S Datasheet

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STPS340SY

STMicroelectronicsIn Stock: 12677STPS340SY Datasheet

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STPS3L40S

STMicroelectronicsIn Stock: 2738STPS3L40S Datasheet

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STPS3L40SY

STMicroelectronicsIn Stock: 2861STPS3L40SY Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMB5819 is determined by the following critical parameters:

Parametric Equivalents maintain identical electrical specifications across voltage rating, current capacity, forward voltage drop, and reverse leakage characteristics. These parts operate within the same temperature range and package footprint.

Similar Parts share the same 40 V voltage rating and fast recovery speed but differ in current capacity (3 A versus 1 A), forward voltage characteristics, reverse leakage performance, and package size (DO-214AB SMC versus DO-214AA SMB). These parts are suitable for applications where higher current capacity is acceptable and package size constraints permit the larger SMC footprint.

The following parameters determine substitution eligibility:

• Voltage - DC Reverse (Vr) (Max): 40 V (required)
• Technology: Schottky (required)
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io) (required)
• Mounting Type: Surface Mount (required)
• Current - Average Rectified (Io): 1 A minimum (for direct equivalents)

Parameter Comparison

Engineering Selection Recommendations

SK14-TP is the primary parametric equivalent for the SMB5819. This part maintains identical electrical specifications including 1 A current rating, 600 mV forward voltage drop, and 500 µA reverse leakage. The SK14-TP is manufactured by Micro Commercial Co and retains the same DO-214AA (SMB) package footprint. The SK14-TP holds active product status and is ROHS3 compliant, addressing the RoHS non-compliance limitation of the obsolete SMB5819.

STPS340S, STPS340SY, STPS3L40S, and STPS3L40SY are similar parts manufactured by STMicroelectronics with 3 A current capacity. These parts are suitable for applications where the 1 A current rating of the SMB5819 is insufficient. All four parts are ROHS3 compliant and hold active product status. STPS340SY and STPS3L40SY include automotive-grade qualification (AEC-Q101) and extended temperature range (-40°C to 150°C), making them suitable for automotive and industrial applications. The STPS3L40S and STPS3L40SY variants offer superior forward voltage performance (500 mV @ 3 A) compared to STPS340S and STPS340SY (630 mV @ 3 A). All similar parts use the larger DO-214AB (SMC) package, which requires PCB layout modification from the SMB5819 design.

Frequently Asked Questions (FAQ)

Q: Can SK14-TP be used as a direct replacement for SMB5819?

A: Yes. The SK14-TP maintains identical electrical specifications including 40 V reverse voltage, 1 A current rating, 600 mV forward voltage drop, and 500 µA reverse leakage. Both parts use the DO-214AA (SMB) package, enabling direct PCB substitution without layout modification.

Q: What is the primary difference between SK14-TP and the STPS340/STPS3L40 series?

A: The SK14-TP is a 1 A equivalent, while STPS340S, STPS340SY, STPS3L40S, and STPS3L40SY are 3 A parts. The STPS series uses the larger DO-214AB (SMC) package instead of DO-214AA (SMB), requiring PCB footprint changes. The STPS3L40 variants offer lower forward voltage (500 mV @ 3 A) compared to STPS340 variants (630 mV @ 3 A).

Q: Are the STPS340SY and STPS3L40SY suitable for automotive applications?

A: Yes. Both STPS340SY and STPS3L40SY carry automotive-grade qualification and AEC-Q101 certification. These parts operate across -40°C to 150°C, supporting automotive temperature requirements.

Q: What compliance improvements does SK14-TP offer over SMB5819?

A: The SK14-TP is ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete SMB5819. Both parts maintain identical electrical performance and package compatibility.

Q: Can STPS340S be used in place of SMB5819 without circuit modification?

A: STPS340S can replace SMB5819 electrically, but PCB layout modification is required. STPS340S uses the DO-214AB (SMC) package, which has a different footprint than the DO-214AA (SMB) package of SMB5819. The higher 3 A current rating of STPS340S is backward compatible with 1 A circuit requirements.

Q: What is the difference between STPS340S and STPS3L40S?

A: Both parts are rated for 40 V and 3 A in the DO-214AB (SMC) package. STPS3L40S offers superior forward voltage performance (500 mV @ 3 A) compared to STPS340S (630 mV @ 3 A), resulting in lower power dissipation. STPS340S exhibits lower reverse leakage (20 µA @ 40 V) compared to STPS3L40S (100 µA @ 40 V).

Q: Is package compatibility critical when selecting a substitute?

A: Package compatibility depends on application requirements. SK14-TP maintains the SMB5819 footprint (DO-214AA), enabling direct PCB substitution. STPS series parts use the larger SMC package (DO-214AB), requiring PCB redesign. Package selection should align with available PCB space and thermal management requirements.