SK12-LTP Equivalent & Substitute Parts

Part Overview

The SK12-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20 V DC reverse voltage and 1 A 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. Organizations using this part in active production or maintenance applications require equivalent alternatives that maintain electrical and mechanical compatibility while offering active product status and continued supply availability.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK12-LTP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Technology: Schottky diode
Voltage - DC Reverse (Vr) (Max): 20 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-214AA, SMB (surface mount)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Operating Temperature Range: Must encompass or exceed -55°C to 125°C
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment
Moisture Sensitivity Level: MSL 1 (Unlimited) for handling compatibility

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (1 A rated current): Parts with identical 1 A current rating, 20 V reverse voltage, and DO-214AA package. These provide pin-for-pin and functional equivalence with minimal circuit impact.

Category B - Higher Current Rated Alternatives (2 A and 3 A rated current): Parts with 2 A or 3 A current ratings at 20 V reverse voltage in DO-214AA package. These provide superior current handling capability and are suitable for applications where the original 1 A rating provides insufficient margin or where circuit redesign permits higher current capacity.

Category C - Voltage Uprated Alternative (30 V rated): Part with 30 V reverse voltage rating in alternative package (SOD-128). This part exceeds voltage requirements but uses a different surface mount package and is suitable only where package compatibility is not a constraint.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Product Status	RoHS Status	Tj (Max) [°C]
SK12-LTP	Micro Commercial Co	20	1	500 @ 1A	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant	125
5817SMJ/TR13	Microchip Technology	20	1	450 @ 1A	DO-214AA, SMB	Active	RoHS non-compliant	150
B120B-13-F	Diodes Incorporated	20	1	500 @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant	150
B220-13-F	Diodes Incorporated	20	2	500 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant	150
B320B-13-F	Diodes Incorporated	20	3	500 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant	150
MBRS120T3G	onsemi	20	1	600 @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant	125
PMEG3010EP,115	Nexperia USA Inc.	30	1	360 @ 1A	SOD-128	Active	ROHS3 Compliant	150
SK32B/TR13	Microsemi Corporation	20	3	500 @ 3A	DO-214AA, SMB	Active	RoHS non-compliant	125
SS22T3G	onsemi	20	2	500 @ 2A	DO-214AA, SMB	Last Time Buy	ROHS3 Compliant	150

Engineering Selection Recommendations

Recommended Primary Substitute: B120B-13-F (Diodes Incorporated)

The B120B-13-F provides direct electrical and mechanical equivalence to the SK12-LTP with the following advantages:

Identical 20 V reverse voltage and 1 A current rating
Matching 500 mV forward voltage at 1 A
DO-214AA, SMB package compatibility
Active product status with continued supply availability
ROHS3 Compliant certification matching the original part
Extended maximum junction temperature (150°C vs. 125°C)
Highest inventory availability (3,281 pcs)

Alternative Primary Substitute: 5817SMJ/TR13 (Microchip Technology)

The 5817SMJ/TR13 offers electrical equivalence with improved forward voltage performance:

Identical 20 V reverse voltage and 1 A current rating
Superior forward voltage: 450 mV @ 1 A (vs. 500 mV)
DO-214AA, SMB package compatibility
Active product status
Extended maximum junction temperature (150°C)
Limitation: RoHS non-compliant status

Higher Current Alternatives for Margin Enhancement:

When circuit design permits increased current capacity:

B220-13-F (2 A rated): Active status, ROHS3 Compliant, 150°C Tj max, highest inventory (65,310 pcs)
B320B-13-F (3 A rated): Active status, ROHS3 Compliant, AEC-Q101 automotive qualification, 150°C Tj max, highest inventory (344,300 pcs)

Voltage Uprated Alternative for Margin Enhancement:

When circuit design permits increased voltage rating:

PMEG3010EP,115 (30 V rated): Active status, ROHS3 Compliant, superior forward voltage (360 mV @ 1 A), alternative SOD-128 package (not pin-compatible with DO-214AA)

Parts Not Recommended:

SS22T3G: Last Time Buy status indicates imminent discontinuation
SK32B/TR13: RoHS non-compliant; limited inventory (824 pcs)
MBRS120T3G: Higher forward voltage (600 mV @ 1 A) may impact circuit performance

Frequently Asked Questions (FAQ)

Q: Can B120B-13-F be used as a direct replacement for SK12-LTP without circuit modification?

A: Yes. The B120B-13-F provides pin-for-pin and functional equivalence. Both parts share identical electrical ratings (20 V, 1 A), matching forward voltage (500 mV @ 1 A), and identical DO-214AA, SMB package. No circuit modification is required.

Q: What is the difference between the 1 A, 2 A, and 3 A rated alternatives?

A: Current rating indicates the maximum average rectified current the diode can conduct continuously. The 1 A alternatives (B120B-13-F, 5817SMJ/TR13, MBRS120T3G) match the original SK12-LTP rating. The 2 A alternatives (B220-13-F, SS22T3G) and 3 A alternatives (B320B-13-F, SK32B/TR13) provide higher current capacity for applications requiring additional margin or higher load current. All maintain the same 20 V reverse voltage rating and DO-214AA package.

Q: Why does PMEG3010EP,115 have a different package (SOD-128) than the other alternatives?

A: The PMEG3010EP,115 is a 30 V rated Schottky diode from Nexperia that exceeds the voltage requirement of the SK12-LTP. Its SOD-128 package is physically and electrically incompatible with the DO-214AA, SMB package. This part is suitable only for applications where package redesign is acceptable and higher voltage margin is required.

Q: What does "RoHS non-compliant" mean for 5817SMJ/TR13 and SK32B/TR13?

A: RoHS (Restriction of Hazardous Substances) non-compliance indicates these parts may contain restricted substances such as lead. Organizations subject to RoHS regulations (EU Directive 2011/65/EU or equivalent) must use ROHS3 Compliant alternatives. The B120B-13-F and B320B-13-F are ROHS3 Compliant equivalents.

Q: Why is SS22T3G marked "Last Time Buy"?

A: Last Time Buy status indicates the manufacturer has announced discontinuation. While currently available (33,245 pcs inventory), this part will not be produced after a specified date. For new designs or long-term supply requirements, use B220-13-F or B320B-13-F instead.

Q: Can I use a higher voltage rated diode (PMEG3010EP,115 at 30 V) in place of the 20 V SK12-LTP?

A: Higher voltage rating provides additional safety margin but does not guarantee compatibility. The PMEG3010EP,115 uses SOD-128 package, which is not pin-compatible with the DO-214AA, SMB package of the SK12-LTP. Package redesign would be required. For voltage margin without package change, use B120B-13-F or other 20 V alternatives in DO-214AA package.

Q: What is the significance of forward voltage (Vf) differences between alternatives?

A: Forward voltage determines the voltage drop across the diode during conduction. The SK12-LTP specifies 500 mV @ 1 A. The 5817SMJ/TR13 offers lower forward voltage (450 mV @ 1 A), reducing power dissipation. The MBRS120T3G has higher forward voltage (600 mV @ 1 A), increasing power dissipation. Selection depends on circuit power budget and thermal management requirements.

Q: Are all alternatives rated for the same temperature range as SK12-LTP (-55°C to 125°C)?

A: No. The SK12-LTP maximum junction temperature is 125°C. Most alternatives (B120B-13-F, 5817SMJ/TR13, B220-13-F, B320B-13-F, SS22T3G, PMEG3010EP,115) support 150°C maximum, providing extended thermal margin. The MBRS120T3G and SK32B/TR13 match the 125°C limit. All alternatives support the -55°C minimum temperature.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL (Moisture Sensitivity Level) 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed alternatives share this MSL 1 rating, ensuring compatible handling and storage procedures.

Q: Which substitute offers the best inventory availability?

A: The B320B-13-F (3 A rated) has the highest inventory at 344,300 pcs. For 1 A direct equivalents, B120B-13-F offers 3,281 pcs. For 2 A alternatives, B220-13-F offers 65,310 pcs. Inventory levels support immediate procurement for all recommended alternatives.

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