Equivalent & Substitute Parts for SL22HE3/5BT Schottky Diode

Part Overview

The SL22HE3/5BT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AA (SMB) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for this diode category.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	440 mV @ 2 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	400 µA @ 20 V	—
Mounting Type	Surface Mount	—
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 SL22HE3/5BT is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20 V
Mounting Type: Surface Mount
Package / Case: DO-214AA, SMB
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Current - Average Rectified (Io): 2 A minimum (higher ratings acceptable for uprating applications)
Voltage - Forward (Vf) (Max) @ If: Within ±60 mV tolerance at rated current
Current - Reverse Leakage @ Vr: Up to 500 µA @ 20 V
Operating Temperature - Junction: Minimum -55°C, maximum 125°C (extended ranges acceptable)

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (Vishay SL22 series variants), Parametric Equivalents (Vishay SL22 series with identical electrical performance), and Cross-Manufacturer Alternatives (Diodes Incorporated, Micro Commercial Co, onsemi) that meet all mandatory parameters within allowable tolerances.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Temp Range [°C]	Product Status	Inventory [Pcs]
SL22HE3/5BT	Vishay	20	2	440 @ 2A	400 @ 20V	-55 to 125	Discontinued	834
SL22HE3_A/I	Vishay	20	2	395 @ 1A	400 @ 20V	-55 to 125	Active	1106
SL22-E3/52T	Vishay	20	2	440 @ 2A	400 @ 20V	-55 to 125	Active	10200
SL22-E3/5BT	Vishay	20	2	440 @ 2A	400 @ 20V	-55 to 125	Active	1045
SL22-M3/52T	Vishay	20	2	440 @ 2A	400 @ 20V	-55 to 125	Active	945
B220-13-F	Diodes Inc	20	2	500 @ 2A	500 @ 20V	-65 to 150	Active	65310
SK32B-LTP	Micro Commercial	20	3	500 @ 3A	500 @ 20V	-55 to 150	Not For New Designs	6836
SK42BL-TP	Micro Commercial	20	4	450 @ 4A	500 @ 20V	-55 to 150	Not For New Designs	2788
SS22T3G	onsemi	20	2	500 @ 2A	400 @ 40V	-55 to 150	Last Time Buy	33245

Engineering Selection Recommendations

Primary Recommendation: SL22-E3/52T (Vishay)

The SL22-E3/52T is the preferred direct parametric equivalent. It maintains identical electrical specifications to the SL22HE3/5BT (20 V, 2 A, 440 mV forward voltage @ 2 A) with active product status and highest available inventory (10,200 pcs). Both parts share the same base product number (SL22) and are manufactured by Vishay General Semiconductor - Diodes Division, ensuring design continuity and supply chain reliability.

Secondary Recommendation: SL22HE3_A/I (Vishay)

The SL22HE3_A/I is an active Vishay equivalent with automotive-grade qualification (AEC-Q101) and improved forward voltage performance (395 mV @ 1 A). This part is suitable for applications requiring enhanced reliability certifications. Inventory availability is adequate (1,106 pcs).

Alternative Recommendation: B220-13-F (Diodes Incorporated)

The B220-13-F is a cross-manufacturer substitute with identical voltage and current ratings. It exhibits higher forward voltage (500 mV @ 2 A) and reverse leakage (500 µA @ 20 V) compared to the original part, but remains within acceptable tolerances for most applications. Extended operating temperature range (-65 to 150°C) and superior inventory (65,310 pcs) provide supply assurance. Active product status supports long-term availability.

Uprating Alternatives: SK32B-LTP and SK42BL-TP (Micro Commercial Co)

These parts provide higher current ratings (3 A and 4 A respectively) while maintaining 20 V reverse voltage and DO-214AA packaging. Both are marked "Not For New Designs," indicating obsolescence trajectory. Use only when current uprating is required and no other alternatives are available.

Legacy Alternative: SS22T3G (onsemi)

The SS22T3G is a 2 A equivalent with "Last Time Buy" status, indicating imminent discontinuation. High inventory (33,245 pcs) is available, but this part should not be selected for new designs due to product lifecycle status.

Frequently Asked Questions (FAQ)

Q: Can I use SL22-E3/52T as a direct replacement for SL22HE3/5BT?

A: Yes. The SL22-E3/52T is a direct parametric equivalent with identical voltage (20 V), current (2 A), forward voltage (440 mV @ 2 A), and reverse leakage (400 µA @ 20 V) specifications. Both use DO-214AA (SMB) surface mount packaging and operate across -55 to 125°C. The primary difference is product status: SL22-E3/52T is active while SL22HE3/5BT is discontinued.

Q: What is the difference between SL22HE3_A/I and SL22-E3/52T?

A: Both are Vishay 20 V, 2 A Schottky diodes in DO-214AA packaging. The SL22HE3_A/I features automotive-grade qualification (AEC-Q101) and lower forward voltage (395 mV @ 1 A), making it suitable for applications requiring enhanced reliability. The SL22-E3/52T has standard industrial qualification with forward voltage of 440 mV @ 2 A. Select SL22HE3_A/I for automotive or mission-critical applications; select SL22-E3/52T for general industrial use.

Q: Can I substitute B220-13-F for the original SL22HE3/5BT?

A: Yes, with parameter awareness. The B220-13-F maintains identical 20 V reverse voltage and 2 A current rating in DO-214AA packaging. However, forward voltage is higher (500 mV @ 2 A versus 440 mV @ 2 A) and reverse leakage is higher (500 µA @ 20 V versus 400 µA @ 20 V). These differences are within acceptable tolerances for most applications but may affect power dissipation and leakage current performance in precision circuits. Verify thermal and leakage requirements before substitution.

Q: Why are SK32B-LTP and SK42BL-TP marked "Not For New Designs"?

A: These parts are in obsolescence phase and manufacturers have discontinued active development and support. While current inventory exists, these parts should not be selected for new product designs due to uncertain long-term availability and potential supply discontinuation. Use only for legacy system maintenance or when current uprating (3 A or 4 A) is specifically required and no active alternatives exist.

Q: Is SS22T3G suitable for new designs?

A: No. The SS22T3G carries "Last Time Buy" status, indicating the manufacturer has announced end-of-life. Although substantial inventory (33,245 pcs) is currently available, this part should not be used in new designs. Select SL22-E3/52T or B220-13-F instead for long-term supply assurance.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage differences directly affect power dissipation in the diode. At 2 A, the difference between 440 mV (original) and 500 mV (B220-13-F) represents an additional 120 mW dissipation. In thermal-sensitive applications or high-frequency switching circuits, this may require thermal design review. For general rectification applications, this difference is typically acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, matching the original SL22HE3/5BT. All parts also have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: Can I use higher-rated parts like SK32B-LTP (3 A) or SK42BL-TP (4 A) in place of the 2 A original?

A: Yes, for uprating applications. Higher current-rated diodes are backward-compatible with lower current requirements. However, this approach increases component cost and board space requirements. Use uprated parts only when circuit design specifically requires higher current capacity or when no 2 A alternatives are available.

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