B350-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B350-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as discontinued at DiGi Electronics, creating a requirement to identify functionally equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain electrical performance within the specified voltage and current ratings while accommodating packaging and compliance requirements of modern supply chains.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 3 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 50 V	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C

Substitute Part Grouping Explanation

Substitution of the B350-13 is determined by the following critical parameters:

Mandatory Equivalence Criteria:

Technology: Schottky diode
Package / Case: DO-214AB, SMC (surface mount)
Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 3 A minimum
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Up to 750 mV @ 3 A
Current - Reverse Leakage @ Vr: Up to 500 µA @ rated voltage
Operating Temperature - Junction: Extended range acceptable
RoHS Status: ROHS3 Compliant preferred for new designs

Substitute parts are grouped into two categories: Direct Parametric Equivalents (identical electrical specifications) and Functional Alternatives (higher voltage or current ratings that operate within the B350-13 application envelope).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	RoHS Status
B350-13	Diodes Incorporated	50	3	700 @ 3A	500 @ 50V	DO-214AB, SMC	Discontinued	Non-compliant
B350-13-F	Diodes Incorporated	50	3	700 @ 3A	500 @ 50V	DO-214AB, SMC	Active	ROHS3 Compliant
SS35	Taiwan Semiconductor Corporation	50	3	750 @ 3A	500 @ 50V	DO-214AB, SMC	Active	ROHS3 Compliant
SS35-E3/9AT	Vishay General Semiconductor - Diodes Division	50	3	750 @ 3A	500 @ 50V	DO-214AB, SMC	Active	ROHS3 Compliant
SK36-TP	Micro Commercial Co	60	3	750 @ 3A	500 @ 60V	DO-214AB, SMC	Obsolete	ROHS3 Compliant
SK64L-TP	Micro Commercial Co	40	6	650 @ 6A	1000 @ 40V	DO-214AB, SMC	Not For New Designs	ROHS3 Compliant
STPS340S	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS340SY	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS3L40S	STMicroelectronics	40	3	500 @ 3A	100 @ 40V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS3L40SY	STMicroelectronics	40	3	500 @ 3A	100 @ 40V	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalent (Recommended for New Designs):

B350-13-F (Diodes Incorporated) is the primary substitute. This part maintains identical electrical specifications to the B350-13 (50 V, 3 A, 700 mV forward voltage) while offering active product status and ROHS3 compliance. The -F suffix indicates Tape & Reel packaging, suitable for automated assembly. This part is in active production with substantial inventory availability (16,316 pieces).

Tier 2 - Functional Equivalents (50 V Rating, 3 A Current):

SS35 (Taiwan Semiconductor Corporation) and SS35-E3/9AT (Vishay General Semiconductor - Diodes Division) both meet the 50 V and 3 A requirements. Forward voltage is specified at 750 mV @ 3 A, representing a 50 mV increase over the B350-13 specification. Both parts are in active production with ROHS3 compliance. SS35-E3/9AT includes Tape & Reel packaging for automated assembly.

Tier 3 - Higher Voltage Rating (Functional Alternative):

SK36-TP (Micro Commercial Co) provides 60 V reverse voltage rating with 3 A current capacity. This part operates within the B350-13 application envelope due to the higher voltage margin. Forward voltage is 750 mV @ 3 A. Product status is listed as obsolete; use is not recommended for new designs.

Tier 4 - Reduced Voltage Rating (Limited Substitution):

STPS340S, STPS340SY, STPS3L40S, and STPS3L40SY (STMicroelectronics) are rated for 40 V reverse voltage with 3 A current. These parts operate at a reduced voltage margin relative to the B350-13 specification. STPS340SY and STPS3L40SY include automotive qualification (AEC-Q101) and extended temperature range (-40°C to 150°C). STPS3L40S and STPS3L40SY feature reduced forward voltage (500 mV @ 3 A). These parts are suitable only for applications where the 40 V rating is adequate.

Tier 5 - Higher Current Rating (Not Recommended):

SK64L-TP (Micro Commercial Co) is rated for 40 V and 6 A. While the current rating exceeds the B350-13 specification, the voltage rating is reduced to 40 V. Product status is "Not For New Designs." This part is not recommended as a substitute.

Frequently Asked Questions (FAQ)

Q: Can B350-13-F be used as a direct replacement for B350-13?

A: Yes. B350-13-F is a direct parametric equivalent with identical electrical specifications (50 V, 3 A, 700 mV forward voltage). The primary difference is packaging format (Tape & Reel vs. bulk) and product status (active vs. discontinued). B350-13-F is recommended for all new designs.

Q: What is the difference between SS35 and SS35-E3/9AT?

A: Both parts are manufactured by different suppliers (Taiwan Semiconductor Corporation vs. Vishay) and meet the same electrical specifications (50 V, 3 A, 750 mV forward voltage). SS35-E3/9AT includes Tape & Reel packaging suitable for automated assembly. Both are ROHS3 compliant and in active production.

Q: Can STPS340SY be used in place of B350-13?

A: STPS340SY is rated for 40 V reverse voltage, which is 10 V lower than the B350-13 specification of 50 V. This part is suitable only for applications where the 40 V rating provides adequate margin. STPS340SY includes automotive qualification (AEC-Q101) and extended temperature range (-40°C to 150°C), making it suitable for automotive applications operating below 40 V.

Q: Why is SK64L-TP not recommended as a substitute?

A: SK64L-TP is rated for 40 V reverse voltage, which is below the B350-13 specification of 50 V. Although the current rating is higher (6 A vs. 3 A), the reduced voltage rating makes this part unsuitable for direct substitution. Additionally, the product status is "Not For New Designs."

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in the following packaging formats: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and bulk. All parts maintain the DO-214AB, SMC surface mount package case. Selection of packaging format depends on assembly process requirements (manual vs. automated).

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant except the original B350-13, which is RoHS non-compliant. For new designs and applications subject to RoHS requirements, B350-13-F, SS35, SS35-E3/9AT, SK36-TP, STPS340S, STPS340SY, STPS3L40S, and STPS3L40SY are all acceptable.

Q: What is the operating temperature range for substitute parts?

A: The B350-13 operates from -55°C to 125°C junction temperature. Most substitute parts extend this range to -55°C to 150°C or -40°C to 150°C. STPS340SY and STPS3L40SY include automotive-grade specifications with -40°C to 150°C operating range and AEC-Q101 qualification.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage differences between parts are specified in the parameter comparison table. The B350-13 specifies 700 mV @ 3 A, while SS35 and SS35-E3/9AT specify 750 mV @ 3 A (50 mV difference). STPS3L40S and STPS3L40SY specify 500 mV @ 3 A (200 mV lower). Circuit design must account for these differences in voltage drop calculations.

Q: What is the moisture sensitivity level (MSL) for these parts?

A: All parts listed have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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