SL44HE3/9AT Equivalent & Substitute Parts

Part Overview

The SL44HE3/9AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 4 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	440 mV @ 4 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 40 V	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SL44HE3/9AT is determined by the following critical parameters:

Parametric Equivalents maintain all electrical specifications (40 V reverse voltage, 4 A current rating, 440 mV forward voltage at 4 A, fast recovery speed, 500 µA reverse leakage) and mechanical compatibility (DO-214AB SMC package, surface mount). These parts differ only in packaging format (tape & reel versus cut tape) or manufacturing date codes. Parametric equivalents include SL44-E3/57T, SL44-E3/9AT, SL44-M3/57T, and SL44-M3/9AT, all from Vishay General Semiconductor - Diodes Division.

Direct Manufacturer Substitutes provide equivalent electrical performance from alternative manufacturers while maintaining the same package and core specifications. SK44L-TP from Micro Commercial Co meets all electrical requirements with a maximum forward voltage of 450 mV at 4 A (10 mV higher than the original) and identical reverse voltage, current rating, and package format.

Manufacturer Recommended Substitutes offer functional alternatives with modified electrical parameters suitable for applications where the original specifications can be relaxed. These include:

B340-13-F (Diodes Incorporated): 40 V, 3 A rating with 500 mV forward voltage at 3 A. Suitable for applications requiring lower current capacity.
LSM840J/TR13 (Microchip Technology): 40 V, 8 A rating with 520 mV forward voltage at 8 A. Suitable for applications requiring higher current capacity.
LSM845J/TR13 (Microchip Technology): 45 V, 8 A rating with 520 mV forward voltage at 8 A. Suitable for applications requiring higher voltage and current capacity.
SK645L-TP (Micro Commercial Co): 45 V, 6 A rating with 650 mV forward voltage at 6 A. Suitable for applications requiring higher voltage and current capacity.
SK64L-TP (Micro Commercial Co): 40 V, 6 A rating with 650 mV forward voltage at 6 A. Suitable for applications requiring higher current capacity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	Packaging Format
SL44HE3/9AT	Vishay	40	4	440 @ 4A	500 @ 40V	DO-214AB, SMC	Obsolete	Tape & Reel (TR)
SL44-E3/57T	Vishay	40	4	440 @ 4A	500 @ 40V	DO-214AB, SMC	Active	Cut Tape (CT) & Digi-Reel®
SL44-E3/9AT	Vishay	40	4	440 @ 4A	500 @ 40V	DO-214AB, SMC	Active	Tape & Reel (TR)
SL44-M3/57T	Vishay	40	4	440 @ 4A	500 @ 40V	DO-214AB, SMC	Active	Tape & Reel (TR)
SL44-M3/9AT	Vishay	40	4	440 @ 4A	500 @ 40V	DO-214AB, SMC	Active	Tape & Reel (TR)
SK44L-TP	Micro Commercial Co	40	4	450 @ 4A	500 @ 40V	DO-214AB, SMC	Active	Tape & Reel (TR)
B340-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Active	Cut Tape (CT) & Digi-Reel®
LSM840J/TR13	Microchip Technology	40	8	520 @ 8A	2000 @ 40V	DO-214AB, SMC	Active	Tape & Reel (TR)
LSM845J/TR13	Microchip Technology	45	8	520 @ 8A	2000 @ 45V	DO-214AB, SMC	Active	Tape & Reel (TR)
SK645L-TP	Micro Commercial Co	45	6	650 @ 6A	1000 @ 45V	DO-214AB, SMC	Active	Bulk
SK64L-TP	Micro Commercial Co	40	6	650 @ 6A	1000 @ 40V	DO-214AB, SMC	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

Select from the parametric equivalent parts SL44-E3/9AT, SL44-E3/57T, SL44-M3/9AT, or SL44-M3/57T. All are manufactured by Vishay General Semiconductor - Diodes Division and maintain active product status with ROHS3 compliance. These parts are electrically and mechanically identical to the obsolete SL44HE3/9AT. Selection between these options depends on packaging format requirements: tape & reel (TR) format for SL44-E3/9AT, SL44-M3/57T, and SL44-M3/9AT, or cut tape with Digi-Reel® for SL44-E3/57T.

For Cross-Manufacturer Replacement (Equivalent Performance):

SK44L-TP from Micro Commercial Co provides equivalent electrical performance with a maximum forward voltage of 450 mV at 4 A (within 10 mV of the original specification). This part maintains 40 V reverse voltage, 4 A current rating, DO-214AB SMC package, and active product status with ROHS3 compliance.

For Higher Current Applications:

LSM840J/TR13 from Microchip Technology provides 8 A current capacity at 40 V reverse voltage. This part is suitable for applications where the original 4 A rating is insufficient. Note that this part carries RoHS non-compliant status and exhibits higher reverse leakage (2 mA at 40 V versus 500 µA for the original).

For Higher Voltage Applications:

LSM845J/TR13 from Microchip Technology provides 45 V reverse voltage with 8 A current capacity. This part is suitable for applications requiring voltage margin above 40 V. Note that this part carries RoHS non-compliant status and exhibits higher reverse leakage (2 mA at 45 V).

For Current-Limited Applications:

B340-13-F from Diodes Incorporated provides 3 A current capacity at 40 V reverse voltage. This part is suitable for applications where 4 A capacity exceeds requirements. The part maintains ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can SL44-E3/9AT be used as a direct replacement for SL44HE3/9AT?

A: Yes. SL44-E3/9AT is a parametric equivalent with identical electrical specifications (40 V, 4 A, 440 mV forward voltage) and mechanical compatibility (DO-214AB SMC package, surface mount). The primary difference is product status: SL44-E3/9AT is active while SL44HE3/9AT is obsolete. Both are manufactured by Vishay and maintain ROHS3 compliance.

Q: What is the difference between SL44-E3/57T and SL44-E3/9AT?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format: SL44-E3/57T is supplied in cut tape with Digi-Reel® format, while SL44-E3/9AT is supplied in tape & reel format. Selection depends on assembly line requirements and tape format compatibility.

Q: Can SK44L-TP from Micro Commercial Co replace the Vishay SL44HE3/9AT?

A: Yes, with minor consideration. SK44L-TP maintains 40 V reverse voltage and 4 A current rating in the same DO-214AB SMC package. The forward voltage is 450 mV at 4 A, which is 10 mV higher than the original 440 mV specification. This difference is within typical application tolerances for Schottky diodes. Both parts maintain ROHS3 compliance and active product status.

Q: When should LSM840J/TR13 be selected instead of the original SL44HE3/9AT?

A: LSM840J/TR13 should be selected when the application requires current capacity exceeding 4 A. This part provides 8 A average rectified current at 40 V reverse voltage in the same DO-214AB SMC package. However, note that LSM840J/TR13 carries RoHS non-compliant status and exhibits higher reverse leakage (2 mA at 40 V versus 500 µA for the original). Verify compliance requirements before selection.

Q: Is B340-13-F suitable for all applications using SL44HE3/9AT?

A: B340-13-F is suitable only for applications where current requirements do not exceed 3 A. This part provides 40 V reverse voltage and 500 mV forward voltage at 3 A in the same DO-214AB SMC package. Applications requiring the full 4 A capacity of the original part require alternative selections such as SL44-E3/9AT or SK44L-TP.

Q: What is the significance of the "Obsolete" product status for SL44HE3/9AT?

A: Obsolete status indicates that the manufacturer has discontinued production and support for this part. Existing inventory may be available from distributors, but long-term procurement cannot be guaranteed. Parametric equivalent parts with active status (SL44-E3/9AT, SL44-M3/9AT, SL44-E3/57T, SL44-M3/57T) provide identical functionality with assured future availability and manufacturer support.

Q: Are all substitute parts ROHS3 compliant?

A: No. Most substitute parts maintain ROHS3 compliance, including SL44-E3/9AT, SL44-M3/9AT, SK44L-TP, B340-13-F, SK64L-TP, and SK645L-TP. However, LSM840J/TR13 and LSM845J/TR13 from Microchip Technology carry RoHS non-compliant status. Verify compliance requirements for your application before selection.

Q: Can SK645L-TP replace SL44HE3/9AT in existing designs?

A: SK645L-TP is not a direct replacement. This part provides 45 V reverse voltage and 6 A current capacity, exceeding the original 40 V and 4 A specifications. The forward voltage is 650 mV at 6 A, significantly higher than the original 440 mV at 4 A. SK645L-TP is suitable only for applications where higher voltage and current capacity are required and forward voltage drop is acceptable. Additionally, SK645L-TP is supplied in bulk packaging format rather than tape & reel.

Q: What packaging formats are available for parametric equivalents?

A: Parametric equivalents are available in two packaging formats: tape & reel (TR) for SL44-E3/9AT, SL44-M3/57T, and SL44-M3/9AT, and cut tape with Digi-Reel® for SL44-E3/57T. Selection depends on assembly equipment compatibility and procurement preferences. All formats maintain identical electrical specifications and mechanical compatibility with the original SL44HE3/9AT.

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