SK34-7 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK34-7 is a 40V, 3A Schottky rectifier diode manufactured by Diodes Incorporated in a Surface Mount SMC (DO-214AB) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs. The SK34-7 operates across a junction temperature range of -65°C to 150°C and is RoHS non-compliant. Substitute parts must maintain electrical equivalence in reverse voltage, average rectified current, forward voltage characteristics, and fast recovery speed specifications while accommodating various package options and compliance requirements.

Key Parameters

Parameter	SK34-7 Specification
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Technology	Schottky
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 150°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SK34-7 is determined by strict electrical and mechanical parameter matching. All substitute parts must satisfy the following core criteria:

Electrical Equivalence Requirements:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility:

Mounting Type: Surface Mount
Package options: DO-214AB (SMC), SOD-128, DO-214AA (SMB), or DO-214AC (SMA)

Environmental & Compliance:

Moisture Sensitivity Level (MSL): 1 (Unlimited)
Operating Temperature Range: Must support minimum -55°C to 125°C junction temperature

Substitute parts are grouped into two categories: Direct Package Equivalents (DO-214AB/SMC package) and Functional Equivalents (alternative surface mount packages with identical electrical specifications). Parts with lower current ratings (750mA) are listed as functional alternatives for reduced-current applications only.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Package / Case	Operating Temp (Junction)	RoHS Status	Product Status
SK34-7	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-65°C ~ 150°C	Non-compliant	Discontinued
SK34-TP	Micro Commercial Co	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-55°C ~ 150°C	ROHS3 Compliant	Active
CDBC340-G	Comchip Technology	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	125°C (Max)	ROHS3 Compliant	Active
PMEG4030EP,115	Nexperia USA Inc.	40 V	3 A	490 mV @ 3 A	SOD-128	150°C (Max)	ROHS3 Compliant	Active
PMEG40T30EPX	Nexperia USA Inc.	40 V	3 A	450 mV @ 3 A	SOD-128	175°C (Max)	ROHS3 Compliant	Active
SS34	MDD	40 V	3 A	Not specified	DO-214AC, SMA	-55°C ~ 125°C	ROHS3 Compliant	Active
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AB, SMC	150°C (Max)	ROHS3 Compliant	Active
STPS3L40S	STMicroelectronics	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	150°C (Max)	ROHS3 Compliant	Active
STPS3L40SY	STMicroelectronics	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-40°C ~ 150°C	ROHS3 Compliant	Active
BAT165E6327HTSA1	Infineon Technologies	40 V	750 mA	740 mV @ 750 mA	SC-76, SOD-323	150°C (Max)	ROHS3 Compliant	Active
SK34B-TP	Micro Commercial Co	40 V	3 A	500 mV @ 3 A	DO-214AA, SMB	-55°C ~ 125°C	ROHS3 Compliant	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical & Package Equivalents):

The SK34-TP (Micro Commercial Co) is the primary substitute for the SK34-7. Both components share identical electrical specifications (40V, 3A, 500mV forward voltage) and the same DO-214AB SMC package. The SK34-TP is ROHS3 compliant and maintains active product status, making it the most direct replacement with minimal design modification required.

The STPS3L40S and STPS3L40SY (STMicroelectronics) are functionally equivalent alternatives in the same DO-214AB SMC package with matching 40V/3A ratings and 500mV forward voltage. Both are ROHS3 compliant and active. The STPS3L40SY variant includes automotive-grade qualification and operates across -40°C to 150°C, suitable for extended temperature applications.

Secondary Substitutes (Functional Equivalents with Package Variations):

The PMEG40T30EPX (Nexperia USA Inc.) provides superior electrical performance in a SOD-128 package with lower forward voltage (450mV @ 3A), lower reverse leakage (28µA @ 40V), and extended junction temperature rating (175°C). This part includes AEC-Q101 automotive qualification and is suitable for applications requiring enhanced thermal performance or reduced power dissipation.

The PMEG4030EP,115 (Nexperia USA Inc.) offers similar performance to PMEG40T30EPX in SOD-128 package with slightly higher forward voltage (490mV @ 3A) and is ROHS3 compliant.

The CDBC340-G (Comchip Technology) maintains identical electrical specifications to SK34-7 in DO-214AB SMC package with ROHS3 compliance and active status. Maximum junction temperature is 125°C.

Limited-Current Alternative:

The BAT165E6327HTSA1 (Infineon Technologies) is a 40V Schottky diode with reduced current rating (750mA) in SOD-323 package. This part is suitable only for applications with current requirements below 750mA and should not be used as a direct replacement for 3A applications.

Not Recommended:

The SK34B-TP (Micro Commercial Co) is classified as obsolete and uses DO-214AA (SMB) package, differing from the original SK34-7 SMC package. The STPS340S (STMicroelectronics) exhibits elevated forward voltage (630mV @ 3A) compared to the SK34-7 specification and is not recommended for applications sensitive to forward voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can the SK34-TP directly replace the SK34-7 without PCB modifications?

A: Yes. The SK34-TP is electrically and mechanically identical to the SK34-7, sharing the same DO-214AB SMC package footprint, 40V reverse voltage, 3A current rating, and 500mV forward voltage specification. No PCB layout changes are required.

Q: What is the difference between DO-214AB (SMC), DO-214AC (SMA), and SOD-128 packages?

A: These are distinct surface mount package formats with different physical dimensions and PCB footprints. DO-214AB (SMC) and DO-214AC (SMA) are larger packages suitable for higher current applications. SOD-128 is a smaller package. Package selection depends on available PCB space and thermal management requirements. Substitution between different packages requires PCB redesign.

Q: Is the PMEG40T30EPX suitable for the SK34-7 application?

A: The PMEG40T30EPX is electrically equivalent (40V, 3A, Schottky) but uses SOD-128 package instead of DO-214AB SMC. It offers superior performance with lower forward voltage (450mV vs 500mV) and lower reverse leakage (28µA vs 500µA). Substitution requires PCB footprint modification. The part is ROHS3 compliant and AEC-Q101 qualified.

Q: Why is the BAT165E6327HTSA1 listed as a substitute if it has only 750mA current rating?

A: The BAT165E6327HTSA1 is listed as a functional alternative for applications with reduced current requirements below 750mA. It maintains the 40V reverse voltage and Schottky technology but cannot support the full 3A specification of the SK34-7. Use this part only when circuit current demands are confirmed below 750mA.

Q: What does ROHS3 compliance mean for the SK34-7 substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original SK34-7 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, making them suitable for applications requiring environmental compliance.

Q: Can I use STPS3L40SY instead of STPS3L40S?

A: Yes. Both parts are electrically identical (40V, 3A, 500mV forward voltage) in DO-214AB SMC package. The STPS3L40SY includes automotive-grade qualification and operates across -40°C to 150°C versus -55°C to 150°C for STPS3L40S. Selection depends on application temperature requirements and automotive certification needs.

Q: What is the significance of reverse recovery time (trr) listed for PMEG40T30EPX?

A: The reverse recovery time (trr) of 21ns indicates the speed at which the diode transitions from forward to reverse bias. Lower trr values reduce switching losses and electromagnetic interference in high-frequency applications. This specification is provided for PMEG40T30EPX but not for the original SK34-7, indicating enhanced performance characteristics in this substitute.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly among substitutes. SK34-TP has 2400 pcs available, PMEG40T30EPX has 12590 pcs, and SS34 has 605100 pcs in stock. Availability may influence selection for high-volume production requirements.

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