SK32B-LTP Equivalent & Substitute Parts

Part Overview

The SK32B-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20V DC reverse voltage and 3A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this diode was previously specified.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A
Technology	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SK32B-LTP is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 20 V (exact match required)
Current - Average Rectified (Io): 3 A (exact match or higher required)
Technology: Schottky (exact match required)
Package / Case: DO-214AA, SMB (exact match required)
Mounting Type: Surface Mount (exact match required)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (exact match required)

Secondary Compatibility Factors:

Operating Temperature - Junction range must encompass or exceed the application requirements
Voltage - Forward (Vf) characteristics must be compatible with circuit design
Current - Reverse Leakage must not exceed circuit specifications

Parts are grouped into two categories: Direct Equivalents (matching all primary criteria at 3A rating) and Parametric Equivalents (matching all primary criteria but with lower current ratings, suitable only where circuit current requirements permit).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Temp Range (°C)	RoHS Status	Product Status
SK32B-LTP	Micro Commercial Co	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	-55 ~ 150	ROHS3 Compliant	Not For New Designs
SK32B/TR13	Microsemi Corporation	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	-55 ~ 125	RoHS non-compliant	Active
B320B-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	-55 ~ 150	ROHS3 Compliant	Active
SS22/1	Vishay General Semiconductor - Diodes Division	20 V	2 A	500 mV @ 2 A	400 µA @ 20 V	-65 ~ 125	RoHS non-compliant	Active
SS22T3G	onsemi	20 V	2 A	500 mV @ 2 A	400 µA @ 40 V	-55 ~ 150	ROHS3 Compliant	Last Time Buy
B220-13-F	Diodes Incorporated	20 V	2 A	500 mV @ 2 A	500 µA @ 20 V	-65 ~ 150	ROHS3 Compliant	Active
5817SMJ/TR13	Microchip Technology	20 V	1 A	450 mV @ 1 A	1 mA @ 20 V	-55 ~ 150	RoHS non-compliant	Active
B120B-13-F	Diodes Incorporated	20 V	1 A	500 mV @ 1 A	500 µA @ 20 V	-65 ~ 150	ROHS3 Compliant	Active
MBRS120T3G	onsemi	20 V	1 A	600 mV @ 1 A	1 mA @ 20 V	-65 ~ 125	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Equivalent (3A Rating):

The B320B-13-F (Diodes Incorporated) is the primary direct equivalent for the SK32B-LTP. It matches all electrical parameters (20V, 3A, 500mV forward voltage, 500µA reverse leakage) and package specifications. The B320B-13-F maintains ROHS3 compliance and an operating temperature range of -55°C to 150°C, identical to the original part. Product status is Active, ensuring long-term availability. This part is qualified to AEC-Q101 automotive standards, providing additional reliability assurance.

The SK32B/TR13 (Microsemi Corporation) provides an alternative direct equivalent with matching electrical characteristics. However, it carries RoHS non-compliance status and a reduced upper operating temperature limit of 125°C compared to the original 150°C specification. This part is suitable only where RoHS compliance is not required and the lower temperature ceiling is acceptable.

Parametric Equivalents (2A Rating):

The B220-13-F (Diodes Incorporated) and SS22T3G (onsemi) are 2A-rated alternatives suitable for applications where circuit current requirements do not exceed 2A. Both maintain 20V reverse voltage rating and 500mV forward voltage characteristics. The B220-13-F is ROHS3 compliant with -65°C to 150°C operating range. The SS22T3G is ROHS3 compliant with -55°C to 150°C range but carries Last Time Buy status, indicating limited future availability.

The SS22/1 (Vishay General Semiconductor - Diodes Division) is a 2A alternative with RoHS non-compliance and -65°C to 125°C operating range.

Parametric Equivalents (1A Rating):

The B120B-13-F (Diodes Incorporated), 5817SMJ/TR13 (Microchip Technology), and MBRS120T3G (onsemi) are 1A-rated alternatives for applications with lower current requirements. The B120B-13-F is ROHS3 compliant with -65°C to 150°C range. The 5817SMJ/TR13 is RoHS non-compliant. The MBRS120T3G is ROHS3 compliant but exhibits 600mV forward voltage at 1A (higher than the original specification) and operates to 125°C maximum.

Compliance and Availability Considerations:

For new production requiring ROHS3 compliance and maximum temperature range, the B320B-13-F is the recommended selection. For legacy system support where RoHS compliance is not mandated, the SK32B/TR13 provides direct electrical equivalence. Lower-current alternatives should be selected only after confirming circuit current requirements do not exceed their rated specifications.

Frequently Asked Questions (FAQ)

Q: Can the B320B-13-F directly replace the SK32B-LTP without circuit modification?

A: Yes. The B320B-13-F matches all critical electrical parameters: 20V reverse voltage, 3A average rectified current, 500mV forward voltage at 3A, and 500µA reverse leakage at 20V. Both use the DO-214AA (SMB) package. No circuit modifications are required.

Q: Why are 2A and 1A rated parts listed as alternatives?

A: These parts are listed as parametric equivalents for applications where the circuit current requirement is lower than 3A. They maintain the same 20V reverse voltage rating and Schottky technology but with reduced current capacity. Selection depends on actual circuit current demands, not the original part's rating.

Q: What is the difference between the SK32B-LTP and SK32B/TR13?

A: Both are 3A, 20V Schottky diodes in DO-214AA packages from the same base product line (SK32). The primary differences are: SK32B/TR13 is RoHS non-compliant (versus ROHS3 compliant for SK32B-LTP), has a lower maximum operating temperature of 125°C (versus 150°C), and is supplied in Tape & Reel packaging. Electrical characteristics are identical.

Q: Is the B220-13-F suitable as a replacement if my circuit only draws 2A?

A: Yes, if circuit analysis confirms maximum current does not exceed 2A. The B220-13-F maintains the same 20V reverse voltage, 500mV forward voltage, and fast recovery speed characteristics. It is ROHS3 compliant and operates to 150°C. Current rating must be verified against actual circuit requirements.

Q: Why does the MBRS120T3G show 600mV forward voltage instead of 500mV?

A: Forward voltage characteristics vary by manufacturer and device design. The MBRS120T3G exhibits 600mV at 1A, which is higher than the original 500mV specification. This affects power dissipation and heat generation. Circuit design must accommodate this higher forward voltage drop if this part is selected.

Q: What does "Last Time Buy" status mean for the SS22T3G?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this product. Existing inventory may be available, but no future production is planned. This part should not be selected for new designs or long-term production requirements. The B220-13-F is the recommended alternative for 2A applications.

Q: Are all listed parts in the same DO-214AA package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility. Packaging format (Cut Tape, Tape & Reel, or Digi-Reel) may vary by supplier but does not affect circuit performance.

Q: Which substitute part has the widest operating temperature range?

A: The B220-13-F and B320B-13-F both operate from -65°C to 150°C (or -55°C to 150°C for B320B-13-F), providing the widest range among active products. The original SK32B-LTP operates -55°C to 150°C.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is mandatory for products sold in the European Union and many other markets. If your application requires RoHS3 compliance, select from: B320B-13-F, B220-13-F, B120B-13-F, SS22T3G, or MBRS120T3G. Parts marked RoHS non-compliant (SK32B/TR13, SS22/1, 5817SMJ/TR13) are restricted in regulated markets.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message