B550C-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B550C-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 5 A average rectified current in a surface mount SMC (DO-214AB) package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and compliance requirements.

Key Parameters

Parameter	B550C-13 Specification
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	5 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 50 V
Capacitance @ Vr, F	300pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the B550C-13 is determined by the following critical parameters:

Voltage Rating Compatibility: The reverse voltage rating must equal or exceed 50 V to maintain circuit protection and reliability margins. Parts rated below 50 V (such as 40 V devices) operate outside the specified voltage envelope and are not direct substitutes.

Current Rating Compatibility: The average rectified current must equal or exceed 5 A. Parts with lower current ratings (such as 3 A devices) cannot safely handle the specified load.

Package Compatibility: All substitutes must use the DO-214AB SMC surface mount package to ensure mechanical and thermal compatibility with existing PCB layouts and assembly processes.

Technology Consistency: All substitutes employ Schottky diode technology, maintaining fast recovery characteristics (≤ 500ns) and forward voltage behavior consistent with the original design.

Thermal Operating Range: Substitutes must support the minimum junction temperature range of -55°C to 125°C. Extended upper temperature ratings (150°C) provide additional thermal margin but do not disqualify a part.

Compliance Status: RoHS3 compliance and REACH unaffected status are required for new designs and ongoing production in regulated markets.

Based on these criteria, substitute parts are grouped as follows:

Group 1 - Direct Electrical Equivalents (50V, 5A): Parts maintaining the exact voltage and current specifications of the B550C-13.

Group 2 - Voltage-Compatible Substitutes (40V or higher, 5A or higher): Parts with voltage or current ratings that exceed the B550C-13 specification, providing functional compatibility within the original circuit design envelope.

Group 3 - Partial Compatibility (40V, 3A or lower): Parts with reduced current ratings that do not meet the 5 A specification and are not suitable for direct substitution in circuits requiring full 5 A capacity.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Package	Temp Range (Tj)	Product Status	RoHS Status
B550C-13	Diodes Incorporated	50 V	5 A	700 mV @ 5 A	DO-214AB, SMC	-55°C ~ 125°C	Discontinued	Non-compliant
B550C-13-F	Diodes Incorporated	50 V	5 A	700 mV @ 5 A	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
SK55L-TP	Micro Commercial Co	50 V	5 A	750 mV @ 5 A	DO-214AB, SMC	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
SK64L-TP	Micro Commercial Co	40 V	6 A	650 mV @ 6 A	DO-214AB, SMC	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
STPS340SY	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AB, SMC	-40°C ~ 150°C	Active	ROHS3 Compliant
STPS3L40S	STMicroelectronics	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
STPS3L40SY	STMicroelectronics	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-40°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: B550C-13-F

The B550C-13-F is the preferred substitute for the discontinued B550C-13. This part is manufactured by Diodes Incorporated (original manufacturer), maintains identical electrical specifications (50 V, 5 A, 700 mV forward voltage), and is packaged in the same DO-214AB SMC format. The B550C-13-F carries Active product status with ROHS3 compliance and extended junction temperature rating (-55°C ~ 150°C), providing superior thermal margin compared to the original part. This part is suitable for new designs and ongoing production applications.

Secondary Recommendation: SK55L-TP

The SK55L-TP manufactured by Micro Commercial Co provides electrical equivalence to the B550C-13 with 50 V reverse voltage and 5 A current rating. Forward voltage is specified at 750 mV @ 5 A, representing a 50 mV increase over the original specification. This part carries ROHS3 compliance and extended temperature rating. However, SK55L-TP is designated "Not For New Designs," limiting its application to legacy system support and repair scenarios where existing inventory is available.

Alternative for Current-Limited Applications: SK64L-TP

The SK64L-TP provides enhanced current capacity (6 A) but operates at a reduced voltage rating (40 V). This part is suitable only in circuits where the maximum reverse voltage does not exceed 40 V. The lower forward voltage (650 mV @ 6 A) offers improved efficiency characteristics. SK64L-TP is designated "Not For New Designs."

Not Recommended: STPS340S, STPS340SY, STPS3L40S, STPS3L40SY

These STMicroelectronics parts are rated for 40 V reverse voltage and 3 A average rectified current. The reduced current rating (3 A versus 5 A) makes these parts unsuitable for direct substitution in circuits designed for 5 A operation. These parts are appropriate only in applications where circuit requirements have been re-evaluated and confirmed to operate within 3 A and 40 V limits. STPS340SY and STPS3L40SY include automotive-grade qualification (AEC-Q101) and are suitable for automotive applications within their electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can the B550C-13-F be used as a direct replacement for the B550C-13 in existing designs?

A: Yes. The B550C-13-F maintains identical electrical specifications (50 V, 5 A, 700 mV forward voltage) and package format (DO-214AB SMC). The extended temperature rating (-55°C ~ 150°C versus -55°C ~ 125°C) and ROHS3 compliance provide improved performance characteristics. No circuit redesign is required.

Q: What is the difference between B550C-13-F and SK55L-TP?

A: Both parts are rated 50 V and 5 A with DO-214AB SMC packaging. The primary difference is forward voltage specification: B550C-13-F is rated 700 mV @ 5 A, while SK55L-TP is rated 750 mV @ 5 A. This 50 mV difference may affect power dissipation in high-current applications. B550C-13-F carries Active product status, while SK55L-TP is designated "Not For New Designs."

Q: Why are STPS340S and STPS3L40S not suitable substitutes?

A: These parts are rated for 3 A average rectified current, compared to the B550C-13 specification of 5 A. In circuits requiring 5 A operation, these parts would operate beyond their rated capacity, resulting in excessive heat generation and potential failure. Additionally, the 40 V voltage rating is below the 50 V specification. These parts are suitable only in applications where circuit requirements have been confirmed to operate within 3 A and 40 V limits.

Q: Can SK64L-TP be used in place of B550C-13?

A: SK64L-TP is not a direct substitute. While it provides enhanced current capacity (6 A), the reverse voltage rating is reduced to 40 V. This part is suitable only in circuits where the maximum reverse voltage does not exceed 40 V. If the original circuit design requires 50 V reverse voltage protection, SK64L-TP does not provide adequate voltage margin and should not be used.

Q: What does "Not For New Designs" mean for SK55L-TP and SK64L-TP?

A: This product status designation indicates that the manufacturer is not recommending these parts for new circuit designs. These parts are typically maintained in inventory for legacy system support and repair applications. For new designs, B550C-13-F (Active status) is the recommended choice.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance status. The original B550C-13 is RoHS non-compliant. If RoHS3 compliance is a requirement for your application, B550C-13-F is the appropriate selection.

Q: What is the significance of the automotive-grade designation on STPS340SY and STPS3L40SY?

A: These parts carry AEC-Q101 automotive qualification and are designated as automotive-grade components. They are suitable for automotive applications requiring automotive-qualified components. However, their 3 A current rating and 40 V voltage rating remain below the B550C-13 specification and do not qualify them as direct substitutes for non-automotive applications.

Q: Can forward voltage differences between substitute parts affect circuit performance?

A: Forward voltage differences affect power dissipation and voltage drop across the diode. The B550C-13 specifies 700 mV @ 5 A. SK55L-TP specifies 750 mV @ 5 A (50 mV higher), while SK64L-TP specifies 650 mV @ 6 A (50 mV lower). In high-current applications, these differences may result in measurable changes to circuit efficiency and thermal performance. Circuit analysis should confirm acceptable performance with the selected substitute part's forward voltage specification.

Q: Is the DO-214AB SMC package format consistent across all substitute parts?

A: Yes. All substitute parts listed use the DO-214AB SMC surface mount package format, ensuring mechanical and thermal compatibility with existing PCB layouts and assembly processes. No PCB redesign is required when substituting between these parts.

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