SK22-LTP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK22-LTP is a 20V, 2A Schottky rectifier diode manufactured by Micro Commercial Co in a surface mount DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part remains in stock with 2780 units available, but alternative components are necessary for new design implementations and long-term supply chain continuity.

Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency switching applications where fast recovery characteristics are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 2 A	mV @ A
Speed - Fast Recovery	≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	2 mA @ 20 V	mA @ V
Capacitance @ Vr, F	230 pF @ 4V, 1MHz	pF @ V, MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK22-LTP is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 20V (exact match required)
Current - Average Rectified (Io): 2A (exact match required)
Package / Case: DO-214AA, SMB (exact match required)
Technology: Schottky (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) Maximum @ If: 500 mV @ 2 A (tolerance range acceptable)
Speed - Fast Recovery: ≤ 500 ns, > 200 mA (Io) (exact match required)
Operating Temperature - Junction: -55°C to 125°C minimum (extended range acceptable)
RoHS Status: ROHS3 Compliant (required for regulatory compliance)
Moisture Sensitivity Level: 1 (Unlimited) (required for handling compatibility)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all primary and secondary criteria with identical or superior electrical characteristics.

Parametric Equivalents: Parts meeting primary criteria with minor variations in reverse leakage current or forward voltage that remain within acceptable engineering tolerances for the application class.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Reverse Leakage @ Vr [µA @ V]	Package	Product Status	Operating Temp [°C]
SK22-LTP	Micro Commercial Co	20	2	500 @ 2	2000 @ 20	DO-214AA, SMB	Not For New Designs	-55 to 125
B220-13-F	Diodes Incorporated	20	2	500 @ 2	500 @ 20	DO-214AA, SMB	Active	-65 to 150
SL22-E3/52T	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2	400 @ 20	DO-214AA, SMB	Active	-55 to 125
SL22-E3/5BT	Vishay General Semiconductor - Diodes Division	20	2	440 @ 2	400 @ 20	DO-214AA, SMB	Active	-55 to 125
SS22T3G	onsemi	20	2	500 @ 2	400 @ 40	DO-214AA, SMB	Last Time Buy	-55 to 150
SS22 R5G	Taiwan Semiconductor Corporation	20	2	500 @ 2	400 @ 20	DO-214AA, SMB	Discontinued at DiGi Electronics	-55 to 125
STPS2L25U	STMicroelectronics	25	2	450 @ 2	90 @ 25	DO-214AA, SMB	Active	-55 to 150

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Product Status):

B220-13-F (Diodes Incorporated): This part is the preferred substitute for new designs. It maintains identical voltage and current ratings with the same forward voltage specification. The extended operating temperature range (-65°C to 150°C) provides superior thermal performance compared to the SK22-LTP. Product status is Active, ensuring long-term availability and supply chain stability. RoHS3 compliance and MSL 1 rating match the original part requirements.

SL22-E3/52T and SL22-E3/5BT (Vishay General Semiconductor - Diodes Division): Both Vishay variants are functionally equivalent with improved forward voltage characteristics (440 mV vs. 500 mV @ 2A), resulting in lower power dissipation. Both parts carry Active product status. Operating temperature range matches the original specification (-55°C to 125°C). These parts are suitable for applications where reduced forward voltage drop is beneficial.

Secondary Substitutes (Limited Availability or Status Constraints):

SS22T3G (onsemi): This part meets all primary electrical criteria with extended operating temperature range (-55°C to 150°C). However, product status is Last Time Buy, indicating limited future availability. Use only when primary substitutes are unavailable or when extended temperature performance is specifically required.

SS22 R5G (Taiwan Semiconductor Corporation): This parametric equivalent meets all electrical requirements but carries Discontinued at DiGi Electronics status. Inventory is limited to 883 units. This part should be considered only for legacy system support or when other substitutes are exhausted.

Alternative with Higher Voltage Rating:

STPS2L25U (STMicroelectronics): This part features a 25V reverse voltage rating, providing additional design margin over the 20V requirement. Forward voltage is improved at 450 mV @ 2A. Product status is Active with extended temperature range (-55°C to 150°C). This part is suitable for applications where higher voltage headroom is desired, though it is not a direct equivalent due to the voltage rating difference.

Frequently Asked Questions (FAQ)

Q: Can I use STPS2L25U as a direct replacement for SK22-LTP?

A: STPS2L25U is not a direct equivalent due to its 25V reverse voltage rating versus the 20V specification of SK22-LTP. However, it functions as a compatible substitute in applications where the 20V requirement is a design margin rather than a hard limit. The higher voltage rating provides additional safety margin. Verify circuit design requirements before substitution.

Q: What is the difference between SL22-E3/52T and SL22-E3/5BT?

A: Both parts are electrically identical with matching voltage, current, and temperature specifications. The difference lies in packaging configuration within the Tape & Reel format. Both are suitable substitutes for SK22-LTP with no functional distinction for component selection purposes.

Q: Why does B220-13-F show a lower reverse leakage current than SK22-LTP?

A: B220-13-F exhibits 500 µA @ 20V reverse leakage compared to SK22-LTP's 2 mA @ 20V. This represents improved leakage characteristics in the Diodes Incorporated design. Lower reverse leakage reduces standby current consumption and is generally advantageous in power supply and protection circuits.

Q: Is SS22T3G suitable for new designs?

A: SS22T3G carries Last Time Buy status, indicating the manufacturer has announced end-of-production. While currently available with 33,245 units in stock, this part should not be selected for new designs requiring long-term supply continuity. Use B220-13-F or Vishay SL22 variants for new designs.

Q: What does MSL 1 (Unlimited) mean for component handling?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. The part does not require special dry-pack storage or baking procedures before soldering. This simplifies inventory management and reduces handling costs compared to higher MSL ratings.

Q: Can I substitute SK22-LTP with a part rated for higher current?

A: Substitution with higher current ratings (e.g., 3A or 5A devices) is not recommended based on the provided parameters. The SK22-LTP is specified for 2A average rectified current. Higher-rated devices may introduce unnecessary cost and board space considerations. Maintain the 2A current specification for equivalent substitution.

Q: What is the significance of "Fast Recovery ≤ 500ns, > 200mA (Io)"?

A: This specification indicates the diode's reverse recovery time is 500 nanoseconds or less when switching from forward to reverse bias at currents exceeding 200mA. This fast recovery characteristic is essential for high-frequency switching applications and power factor correction circuits. All listed substitutes maintain this specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 Compliant status, matching the original SK22-LTP requirement. This ensures compatibility with regulatory requirements for lead-free manufacturing and hazardous substance restrictions.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both are tape-based packaging formats suitable for automated assembly. Tape & Reel (TR) is supplied on continuous reels for high-volume production runs. Cut Tape (CT) is supplied in smaller quantities on cut tape segments. Both formats contain identical components; the difference is in supply quantity and handling method. Verify your assembly equipment compatibility before selecting packaging format.

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