SL42HE3_A/I Equivalent & Substitute Parts

Part Overview

The SL42HE3_A/I is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20 V DC reverse voltage and 4 A average rectified current in a DO-214AB (SMC) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The SL42HE3_A/I is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements. Fast recovery characteristics (≤500 ns for currents >200 mA) and automotive-grade qualification make this diode suitable for power conversion and protection applications in automotive and industrial environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	420 mV @ 4 A	mV
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 20 V
Technology	Schottky	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SL42HE3_A/I is determined by electrical and mechanical parameter compatibility within the Schottky diode category. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
Current - Average Rectified (Io): Must equal or exceed 4 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 420 mV @ 4 A
Speed: Fast Recovery ≤500 ns, >200 mA (Io)
Current - Reverse Leakage @ Vr: Must not exceed 500 µA @ 20 V

Mechanical Parameters:

Package / Case: DO-214AB, SMC (surface mount compatibility)
Mounting Type: Surface Mount
Operating Temperature - Junction: Must support -55°C to 125°C range

Compliance Parameters:

Technology: Schottky
Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant

Substitute parts are classified into two categories:

Direct Manufacturer Substitutes: Parts from the same manufacturer (Vishay) with identical or superior electrical ratings and identical package specifications.
Parametric Equivalents: Parts from the same manufacturer with identical electrical specifications and packaging, differing only in packaging format (tape & reel, cut tape) or product status.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Product Status	Inventory
SL42HE3_A/I	Vishay	20 V	4 A	420 mV @ 4 A	≤500 ns	500 µA @ 20 V	DO-214AB	Discontinued	1104 Pcs
SL42HE3_B/I	Vishay	20 V	8 A	470 mV @ 8 A	≤500 ns	500 µA @ 20 V	DO-214AB	Active	965 Pcs
SL42-E3/57T	Vishay	20 V	4 A	420 mV @ 4 A	≤500 ns	500 µA @ 20 V	DO-214AB	Active	10400 Pcs
SL42-E3/9AT	Vishay	20 V	4 A	420 mV @ 4 A	≤500 ns	500 µA @ 20 V	DO-214AB	Active	747 Pcs
SL42-M3/57T	Vishay	20 V	4 A	420 mV @ 4 A	≤500 ns	500 µA @ 20 V	DO-214AB	Active	16550 Pcs
SL42-M3/9AT	Vishay	20 V	4 A	420 mV @ 4 A	≤500 ns	500 µA @ 20 V	DO-214AB	Active	862 Pcs

Engineering Selection Recommendations

Primary Substitute: SL42-M3/57T

The SL42-M3/57T is the recommended substitute for the discontinued SL42HE3_A/I. This part maintains identical electrical specifications (20 V, 4 A, 420 mV forward voltage) and package configuration (DO-214AB surface mount). The part is currently active with high inventory availability (16,550 pieces). Both parts share automotive-grade qualification (AEC-Q101), ROHS3 compliance, and identical operating temperature range (-55°C to 125°C).

Secondary Substitute: SL42-E3/57T

The SL42-E3/57T provides parametric equivalence with identical electrical ratings and package specifications. This part is active with substantial inventory (10,400 pieces) and meets all compliance requirements. The primary distinction is packaging format (cut tape versus tape & reel).

Tertiary Substitute: SL42-E3/9AT

The SL42-E3/9AT offers identical electrical and mechanical specifications with active product status. Inventory availability is lower (747 pieces) compared to primary and secondary options.

Tertiary Substitute: SL42-M3/9AT

The SL42-M3/9AT maintains full parametric equivalence with active status and moderate inventory (862 pieces).

Higher Current Alternative: SL42HE3_B/I

The SL42HE3_B/I is a direct manufacturer substitute with superior current rating (8 A versus 4 A) and identical reverse voltage (20 V). Forward voltage increases to 470 mV @ 8 A. This part is suitable for applications requiring higher current capacity within the same voltage class. Product status is active with 965 pieces in inventory.

All recommended substitutes maintain automotive-grade qualification, AEC-Q101 certification, ROHS3 compliance, and identical thermal operating range. Selection among primary, secondary, and tertiary options depends on packaging format requirements and inventory availability at the time of procurement.

Frequently Asked Questions (FAQ)

Q: Can SL42HE3_B/I replace SL42HE3_A/I in all applications?

A: SL42HE3_B/I is electrically compatible for applications where the 4 A current rating is not exceeded. The part provides superior current capacity (8 A) and identical reverse voltage (20 V). Forward voltage increases from 420 mV to 470 mV at rated current. Substitution is valid for circuits designed for 4 A operation or lower. Thermal and compliance characteristics are identical.

Q: What is the difference between SL42-M3/57T and SL42-E3/57T?

A: Both parts are parametric equivalents with identical electrical specifications (20 V, 4 A, 420 mV forward voltage) and DO-214AB packaging. The designation difference (M3 versus E3) reflects internal Vishay product line differentiation. Both parts are active, AEC-Q101 qualified, and ROHS3 compliant. Selection between these parts depends on packaging format availability and supplier inventory.

Q: Are all substitute parts qualified to AEC-Q101?

A: All substitute parts listed (SL42HE3_B/I, SL42-E3/57T, SL42-E3/9AT, SL42-M3/57T, SL42-M3/9AT) carry automotive-grade qualification and AEC-Q101 certification, matching the original SL42HE3_A/I specification.

Q: What packaging formats are available for the SL42 series?

A: The SL42 series is available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT), and individual packaging. All variants maintain identical DO-214AB (SMC) case configuration for surface mount assembly. Packaging format selection depends on production volume and assembly equipment compatibility.

Q: Do all substitute parts meet ROHS3 and REACH compliance?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the original SL42HE3_A/I compliance status.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across the junction temperature range of -55°C to 125°C, identical to the original SL42HE3_A/I specification.

Q: Can SL42-M3/57T be used in place of SL42HE3_A/I without circuit modification?

A: Yes. SL42-M3/57T maintains identical electrical parameters (20 V reverse voltage, 4 A average rectified current, 420 mV forward voltage) and DO-214AB surface mount package configuration. No circuit modification is required for direct substitution.

Q: Which substitute part has the highest inventory availability?

A: SL42-M3/57T has the highest inventory availability with 16,550 pieces in stock, followed by SL42-E3/57T with 10,400 pieces.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message