SK32A-LTP Equivalent & Substitute Parts

Part Overview

The SK32A-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20 V DC reverse voltage and 3 A average rectified current in a DO-214AC (SMA) surface mount package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and ongoing production support for existing applications utilizing this component.

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)
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature - Junction	-50°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SK32A-LTP is determined by the following critical parameters: reverse voltage rating (20 V maximum), average rectified current capacity (3 A minimum for direct replacement), forward voltage characteristics, package compatibility (DO-214AC/SMA), and fast recovery speed classification. Parts are grouped into two categories:

Category 1: Direct Current Rating Match (3 A) Parts meeting or exceeding the 3 A current specification with identical 20 V reverse voltage rating and compatible package form factor.

Category 2: Lower Current Rating (1 A - 2 A) Parts with reduced current capacity suitable for applications where the full 3 A rating is not required, maintaining voltage and package compatibility.

All substitute parts listed maintain the DO-214AC (SMA) package specification, surface mount mounting type, fast recovery speed characteristic, and ROHS3 compliance status of the original part.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Technology	Vr (Max)	Io (A)	Vf (Max) @ If	Package	Product Status	Operating Temp (°C)
SK32A-LTP	Micro Commercial Co	Schottky	20 V	3	500 mV @ 3 A	DO-214AC (SMA)	Not For New Designs	-50 ~ 125
B320A-13-F	Diodes Incorporated	Schottky	20 V	3	500 mV @ 3 A	DO-214AC (SMA)	Active	-55 ~ 150
SBR3U20SA-13	Diodes Incorporated	Super Barrier	20 V	3	390 mV @ 3 A	DO-214AC (SMA)	Active	-65 ~ 150
B220A-13-F	Diodes Incorporated	Schottky	20 V	2	500 mV @ 2 A	DO-214AC (SMA)	Active	-65 ~ 150
B120-13-F	Diodes Incorporated	Schottky	20 V	1	500 mV @ 1 A	DO-214AC (SMA)	Active	-65 ~ 150
MBRA120ET3G	onsemi	Schottky	20 V	1	530 mV @ 1 A	DO-214AC (SMA)	Active	-55 ~ 150
SS12	Taiwan Semiconductor Corporation	Schottky	20 V	1	500 mV @ 1 A	DO-214AC (SMA)	Active	-55 ~ 125

Engineering Selection Recommendations

Primary Substitute: B320A-13-F The B320A-13-F from Diodes Incorporated is the optimal substitute for the SK32A-LTP. This part maintains identical electrical specifications (20 V, 3 A, 500 mV forward voltage) and package form factor while offering Active product status. The B320A-13-F includes AEC-Q101 automotive qualification and operates across an extended temperature range (-55°C to 150°C), providing superior reliability margins compared to the original part.

Secondary Substitute: SBR3U20SA-13 The SBR3U20SA-13 from Diodes Incorporated provides equivalent current and voltage ratings with Super Barrier technology, delivering improved forward voltage characteristics (390 mV @ 3 A) and extended operating temperature range (-65°C to 150°C). This part is suitable for applications where reduced forward voltage drop and thermal performance are beneficial.

Lower Current Alternatives: B220A-13-F, B120-13-F, MBRA120ET3G, SS12 These parts are applicable only to applications where the 3 A current requirement can be reduced to 2 A or 1 A respectively. All maintain 20 V reverse voltage rating and DO-214AC package compatibility with Active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can B320A-13-F directly replace SK32A-LTP in all applications? A: Yes. The B320A-13-F maintains identical reverse voltage (20 V), average rectified current (3 A), forward voltage (500 mV @ 3 A), and package specifications (DO-214AC/SMA). Both parts are Schottky technology with fast recovery speed characteristics. The B320A-13-F offers extended operating temperature range and Active product status.

Q: What is the difference between Schottky and Super Barrier technology in the SBR3U20SA-13? A: Both are fast recovery rectifier technologies. The SBR3U20SA-13 Super Barrier variant exhibits lower forward voltage (390 mV @ 3 A versus 500 mV @ 3 A), resulting in reduced power dissipation. Technology selection depends on application thermal and efficiency requirements.

Q: Can I use B120-13-F or B220A-13-F as substitutes? A: These parts are substitutes only for applications where current requirements do not exceed 1 A and 2 A respectively. The SK32A-LTP is rated for 3 A; using lower-rated parts in 3 A applications will result in component overstress and failure.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance status identical to the SK32A-LTP.

Q: What is the significance of the DO-214AC (SMA) package designation? A: DO-214AC and SMA are equivalent designations for the same surface mount package form factor. All listed parts use this identical package, ensuring PCB footprint and reflow soldering process compatibility.

Q: Does the extended operating temperature range of substitute parts affect circuit design? A: The substitute parts operate across wider temperature ranges (-55°C to 150°C or -65°C to 150°C) compared to the SK32A-LTP (-50°C to 125°C). This provides additional thermal margin but does not require circuit redesign for applications within the original part's temperature specification.

Q: What is the inventory status of substitute parts? A: B320A-13-F (35,100 units), SBR3U20SA-13 (9,063 units), B220A-13-F (21,767 units), B120-13-F (109,100 units), MBRA120ET3G (16,601 units), and SS12 (65,300 units) are all available in stock as new original components.

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