B520C-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B520C-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 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 equivalent and substitute components for ongoing production and repair applications. The B520C-13 operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for switching power supply and rectification circuits.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 5 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 20 V	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B520C-13 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Technology: Schottky (mandatory)
Voltage - DC Reverse (Vr) (Max): 20 V (minimum requirement)
Current - Average Rectified (Io): 5 A (minimum requirement)
Package / Case: DO-214AB, SMC (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (functional requirement)

Substitution Categories:

Direct Equivalents meet all primary criteria with identical or superior electrical performance and active product status. These parts are pin-compatible and functionally interchangeable without circuit modification.

Parametric Equivalents meet all primary criteria but include additional qualifications (such as automotive grade AEC-Q101) or minor variations in secondary parameters (reverse leakage, capacitance). These parts are functionally equivalent for standard applications.

Manufacturer-Recommended Alternatives meet the primary voltage and current requirements but may exhibit variations in secondary parameters such as forward voltage, reverse leakage, or operating temperature range. Selection depends on specific circuit requirements.

Partial Substitutes meet most criteria but have reduced current rating (3 A instead of 5 A) or elevated reverse voltage rating (100 V instead of 20 V). These parts are suitable only for applications with reduced current demands or where higher voltage rating is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	RoHS Status
B520C-13	Diodes Incorporated	20	5	550 @ 5A	500 @ 20V	DO-214AB, SMC	Discontinued	Non-compliant
B520C-13-F	Diodes Incorporated	20	5	550 @ 5A	500 @ 20V	DO-214AB, SMC	Active	ROHS3 Compliant
B520CQ-13-F	Diodes Incorporated	20	5	550 @ 5A	500 @ 20V	DO-214AB, SMC	Active	ROHS3 Compliant
CDBC520-HF	Comchip Technology	20	5	500 @ 5A	500 @ 20V	DO-214AB, SMC	Active	ROHS3 Compliant
MBRS320T3G	onsemi	20	3	500 @ 3A	2000 @ 20V	DO-214AB, SMC	Active	ROHS3 Compliant
SK510L-TP	Micro Commercial Co	100	5	850 @ 5A	1000 @ 100V	DO-214AB, SMC	Active	ROHS3 Compliant
SK52_R1_00001	Panjit International Inc.	20	5	550 @ 5A	200 @ 20V	DO-214AB, SMC	Active	ROHS3 Compliant
SK52L-TP	Micro Commercial Co	20	5	550 @ 5A	1000 @ 20V	DO-214AB, SMC	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Replacement:

B520C-13-F (Diodes Incorporated) is the primary recommended substitute. This part is the active production equivalent of the discontinued B520C-13, maintaining identical electrical specifications while achieving ROHS3 compliance. The -F suffix indicates Tape & Reel packaging, suitable for automated assembly. With 32,100 units in stock, this part provides supply continuity and is suitable for all applications previously using the B520C-13.

Recommended Parametric Equivalent:

B520CQ-13-F (Diodes Incorporated) is qualified to AEC-Q101 automotive standards and is suitable for applications requiring automotive-grade reliability. This part maintains identical electrical specifications to the B520C-13 and is ROHS3 compliant. Selection of this part is appropriate when automotive qualification is a design requirement.

Recommended Manufacturer Alternative:

CDBC520-HF (Comchip Technology) provides equivalent voltage and current ratings with a 50 mV reduction in forward voltage drop (500 mV vs. 550 mV @ 5 A), resulting in lower power dissipation. This part is ROHS3 compliant and active in production. The lower forward voltage characteristic makes this part suitable for efficiency-critical applications.

SK52_R1_00001 (Panjit International Inc.) provides equivalent voltage and current ratings with reduced reverse leakage (200 µA vs. 500 µA @ 20 V). This part is ROHS3 compliant and active in production. Selection is appropriate for low-leakage applications.

Not Recommended for New Designs:

SK52L-TP (Micro Commercial Co) carries a "Not For New Designs" status and exhibits elevated reverse leakage (1000 µA @ 20 V). This part should be used only for legacy system maintenance where supply of active alternatives is unavailable.

Partial Substitutes (Current Derating Required):

MBRS320T3G (onsemi) has a reduced current rating of 3 A versus the required 5 A. This part is suitable only for applications where the circuit load current does not exceed 3 A. The elevated reverse leakage (2000 µA @ 20 V) requires thermal analysis in low-leakage applications.

Not Suitable:

SK510L-TP (Micro Commercial Co) has a 100 V reverse voltage rating, which exceeds the 20 V requirement. While this part is pin-compatible, the elevated voltage rating and forward voltage drop (850 mV @ 5 A) make it unsuitable for 20 V circuits without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can B520C-13-F be used as a direct replacement for B520C-13?

A: Yes. B520C-13-F is the active production equivalent of the discontinued B520C-13. Both parts share identical electrical specifications (20 V, 5 A, 550 mV forward voltage) and the same DO-214AB SMC package. The primary difference is packaging format (Tape & Reel vs. bulk) and RoHS compliance status. B520C-13-F is suitable for all applications previously using B520C-13.

Q: What is the difference between B520C-13-F and B520CQ-13-F?

A: Both parts are manufactured by Diodes Incorporated and share identical electrical specifications. B520CQ-13-F includes AEC-Q101 automotive qualification, making it suitable for automotive applications requiring documented reliability standards. B520C-13-F is the standard industrial-grade equivalent. Selection depends on whether automotive qualification is a design requirement.

Q: Why is CDBC520-HF listed as a substitute if it has different forward voltage?

A: CDBC520-HF meets all primary substitution criteria: 20 V reverse voltage, 5 A current rating, DO-214AB SMC package, and fast recovery speed. The 50 mV reduction in forward voltage (500 mV vs. 550 mV @ 5 A) is a secondary parameter variation that results in lower power dissipation. This characteristic makes CDBC520-HF suitable for efficiency-critical applications. Circuit validation is required to confirm the lower forward voltage does not affect circuit operation.

Q: Can MBRS320T3G be used in place of B520C-13?

A: MBRS320T3G has a reduced current rating of 3 A versus the required 5 A. This part is suitable only for applications where the circuit load current does not exceed 3 A. The part is not suitable for applications requiring the full 5 A rating. Additionally, MBRS320T3G exhibits elevated reverse leakage (2000 µA @ 20 V) compared to B520C-13 (500 µA @ 20 V), requiring thermal analysis in low-leakage applications.

Q: Is SK510L-TP a suitable substitute?

A: SK510L-TP is not suitable for direct substitution. While this part maintains the 5 A current rating and DO-214AB SMC package, it has a 100 V reverse voltage rating versus the required 20 V. The elevated forward voltage drop (850 mV @ 5 A vs. 550 mV @ 5 A) results in significantly higher power dissipation. This part is suitable only for applications where higher voltage rating is required and circuit redesign is acceptable.

Q: What does "Not For New Designs" mean for SK52L-TP?

A: "Not For New Designs" indicates that the manufacturer has discontinued active development and promotion of this part. While SK52L-TP remains in production and meets the electrical specifications, it should be used only for legacy system maintenance or repair where supply of active alternatives is unavailable. For new designs, B520C-13-F or B520CQ-13-F are the recommended choices.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts (B520C-13-F, B520CQ-13-F, CDBC520-HF, SK52_R1_00001, and SK52L-TP) are ROHS3 compliant. The original B520C-13 is RoHS non-compliant. If RoHS compliance is a design requirement, B520C-13-F is the direct replacement.

Q: What is the significance of the DO-214AB SMC package designation?

A: DO-214AB and SMC are equivalent designations for the same surface mount package. All listed substitute parts use this package, ensuring mechanical and thermal compatibility with the original B520C-13. The package is suitable for automated pick-and-place assembly and provides adequate thermal dissipation for the 5 A rating in typical PCB layouts.

Q: Can reverse leakage differences affect circuit performance?

A: Reverse leakage variations can affect circuit performance in low-leakage applications such as precision analog circuits, high-impedance signal paths, or circuits with extended idle periods. B520C-13 specifies 500 µA @ 20 V. SK52_R1_00001 has lower leakage (200 µA), while SK52L-TP and MBRS320T3G have higher leakage (1000 µA and 2000 µA respectively). Circuit validation is required when substituting parts with significantly different reverse leakage characteristics.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in two packaging formats: Tape & Reel (TR) for automated assembly and Cut Tape (CT) for manual or semi-automated assembly. B520C-13-F, B520CQ-13-F, SK52_R1_00001, and SK52L-TP are available in Tape & Reel format. CDBC520-HF and SK510L-TP are available in Cut Tape format. Selection depends on assembly process requirements.

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