SL44HE3_A/I Schottky Diode 40V 4A DO-214AB Equivalent & Substitute Parts

Part Overview

The SL44HE3_A/I is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40V DC reverse voltage and 4A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant, making it suitable for automotive and industrial applications requiring fast recovery Schottky diode performance.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	440 mV @ 4 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SL44HE3_A/I is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
Current - Average Rectified (Io): Must equal or exceed 4A
Package / Case: Must be DO-214AB or SMC equivalent
Mounting Type: Must be Surface Mount
Technology: Must be Schottky
Operating Temperature Range: Must accommodate -55°C to 125°C minimum

Substitution Categories:

Direct Manufacturer Equivalents (Vishay SL44 Series): Parts sharing identical base product number (SL44) with matching voltage (40V) and current (4A) ratings, differing only in packaging format or tape configuration. These include SL44-E3/57T, SL44-E3/9AT, SL44-M3/57T, and SL44-M3/9AT.

Cross-Manufacturer Parametric Equivalents: Parts from alternative manufacturers (Micro Commercial Co, Diodes Incorporated, Microchip Technology) meeting the same electrical specifications (40V, 4A minimum) in identical or compatible packages.

Higher Current Capacity Substitutes: Parts rated for 8A or 6A current capacity at 40V or 45V, suitable for applications where the original 4A rating is insufficient. These include SL44HE3_B/I (8A), LSM840J/TR13 (8A), and SK645L-TP (6A).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Status	RoHS
SL44HE3_A/I	Vishay	40V	4A	440 mV @ 4A	DO-214AB	Discontinued	ROHS3
SL44HE3_B/I	Vishay	40V	8A	500 mV @ 8A	DO-214AB	Active	ROHS3
SL44-E3/57T	Vishay	40V	4A	440 mV @ 4A	DO-214AB	Active	ROHS3
SL44-E3/9AT	Vishay	40V	4A	440 mV @ 4A	DO-214AB	Active	ROHS3
SL44-M3/57T	Vishay	40V	4A	440 mV @ 4A	DO-214AB	Active	ROHS3
SL44-M3/9AT	Vishay	40V	4A	440 mV @ 4A	DO-214AB	Active	ROHS3
SK44L-TP	Micro Commercial Co	40V	4A	450 mV @ 4A	DO-214AB	Active	ROHS3
B340-13-F	Diodes Incorporated	40V	3A	500 mV @ 3A	DO-214AB	Active	ROHS3
LSM840J/TR13	Microchip Technology	40V	8A	520 mV @ 8A	DO-214AB	Active	Non-compliant
LSM845J/TR13	Microchip Technology	45V	8A	520 mV @ 8A	DO-214AB	Active	Non-compliant
SK645L-TP	Micro Commercial Co	45V	6A	650 mV @ 6A	DO-214AB	Active	Not specified

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred):

SL44-E3/57T, SL44-E3/9AT, SL44-M3/57T, and SL44-M3/9AT are direct parametric equivalents to the SL44HE3_A/I. All are manufactured by Vishay, maintain identical electrical specifications (40V, 4A, 440 mV forward voltage), and carry active product status with ROHS3 compliance. Selection among these four parts depends on packaging requirements: SL44-E3/57T and SL44-M3/57T are supplied in Cut Tape (CT) & Digi-Reel format, while SL44-E3/9AT and SL44-M3/9AT are supplied in Tape & Reel (TR) format. All maintain automotive-grade qualification and AEC-Q101 certification.

Tier 2 - Cross-Manufacturer Equivalent:

SK44L-TP (Micro Commercial Co) provides electrical equivalence at 40V, 4A with marginally higher forward voltage (450 mV vs. 440 mV @ 4A). This part is active, ROHS3 compliant, and available in high inventory quantities. Forward voltage difference of 10 mV is within typical application tolerance for most rectification circuits.

Tier 3 - Higher Current Capacity (Design Upgrade):

SL44HE3_B/I (Vishay, 8A) and LSM840J/TR13 (Microchip, 8A) provide doubled current capacity at 40V, suitable for applications requiring increased current headroom. SL44HE3_B/I maintains full Vishay automotive qualification and ROHS3 compliance. LSM840J/TR13 is active but carries RoHS non-compliant status, requiring compliance verification for regulated applications.

Tier 4 - Higher Voltage Capacity:

LSM845J/TR13 (Microchip, 45V, 8A) and SK645L-TP (Micro Commercial Co, 45V, 6A) provide elevated voltage ratings suitable for circuits requiring margin above 40V. Both are active and surface mount compatible. LSM845J/TR13 carries RoHS non-compliant status. SK645L-TP exhibits higher forward voltage (650 mV @ 6A) and should be evaluated for thermal impact in power-sensitive applications.

Not Recommended:

B340-13-F (Diodes Incorporated, 3A) falls below the 4A current requirement and is unsuitable as a direct replacement.

Frequently Asked Questions (FAQ)

Q: Can I use SL44-E3/57T as a direct replacement for SL44HE3_A/I?

A: Yes. SL44-E3/57T is a direct parametric equivalent with identical voltage (40V), current (4A), forward voltage (440 mV @ 4A), and package (DO-214AB). Both are Vishay products with AEC-Q101 qualification and ROHS3 compliance. The primary difference is packaging format: SL44-E3/57T is supplied in Cut Tape & Digi-Reel format, while SL44HE3_A/I was supplied in standard tape format. No circuit modifications are required.

Q: What is the difference between SL44-E3/57T and SL44-M3/57T?

A: Both parts are identical in electrical specifications (40V, 4A, 440 mV forward voltage) and package (DO-214AB). The designation difference (E3 vs. M3) reflects internal Vishay product line categorization but does not affect functional performance or compatibility. Selection between these parts should be based on inventory availability and supplier preference.

Q: Can I substitute SK44L-TP for SL44HE3_A/I?

A: Yes, with minor consideration. SK44L-TP (Micro Commercial Co) meets the 40V, 4A electrical requirements and uses the same DO-214AB package. Forward voltage is 450 mV @ 4A compared to 440 mV @ 4A for the original part—a 10 mV difference that is typically acceptable in rectification applications. Both are ROHS3 compliant and surface mount compatible.

Q: Why would I choose SL44HE3_B/I (8A) over the 4A equivalent?

A: SL44HE3_B/I provides doubled current capacity at the same 40V rating and identical package. This upgrade is appropriate when circuit analysis indicates the original 4A rating provides insufficient margin, or when design requirements have increased. The 8A part maintains Vishay automotive qualification and ROHS3 compliance. Forward voltage increases to 500 mV @ 8A, which may affect thermal performance in high-current applications.

Q: Is LSM840J/TR13 suitable for automotive applications?

A: LSM840J/TR13 (Microchip, 8A, 40V) meets the electrical specifications and uses the correct DO-214AB package. However, this part carries RoHS non-compliant status, which may restrict use in regulated automotive or consumer applications subject to RoHS directives. Verify compliance requirements before selection. The part is otherwise electrically suitable.

Q: What is the significance of the packaging designations (CT, TR, Bulk)?

A: Packaging designations indicate supply format: Cut Tape (CT) & Digi-Reel is suitable for mixed-volume production and prototyping; Tape & Reel (TR) is standard for high-volume automated assembly; Bulk packaging is used for specific applications. All three formats contain identical components in the same DO-214AB package. Selection depends on production volume and assembly equipment compatibility, not electrical performance.

Q: Can I use SK645L-TP (45V, 6A) in place of SL44HE3_A/I (40V, 4A)?

A: SK645L-TP is electrically compatible from a voltage standpoint (45V exceeds 40V requirement) and provides increased current capacity (6A exceeds 4A requirement). However, forward voltage is significantly higher at 650 mV @ 6A compared to 440 mV @ 4A. This 210 mV increase will generate additional heat and may affect circuit performance in power-sensitive applications. Use only when thermal analysis confirms acceptability.

Q: Are all substitute parts qualified to the same temperature range?

A: Most substitute parts operate across -55°C to 125°C, matching the original SL44HE3_A/I specification. LSM840J/TR13 and LSM845J/TR13 extend to -55°C to 150°C, providing additional high-temperature margin. Verify specific application temperature requirements before selection.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics council qualification standard for discrete semiconductors. It certifies that the component meets automotive industry reliability, quality, and performance standards. SL44HE3_A/I and most Vishay SL44 series equivalents carry this qualification, making them suitable for automotive applications. Microchip LSM series parts do not explicitly list AEC-Q101 qualification in the provided data.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message