SS1F4HM3/I Equivalent & Substitute Parts

Part Overview

The SS1F4HM3/I is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount DO-219AB package. This component is classified as Active product status and carries automotive-grade qualification under AEC-Q101. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, packaging format preferences, or inventory availability across distribution channels.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	150	µA @ 40 V
Capacitance @ Vr, F	85	pF @ 4V, 1MHz
Operating Temperature - Junction (Max)	175	°C
Package / Case	DO-219AB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS1F4HM3/I is permissible with parts that maintain identical electrical specifications across all critical parameters: 40 V maximum reverse voltage, 1 A average rectified current, 520 mV maximum forward voltage at 1 A, fast recovery speed characteristic (≤ 500ns for currents > 200mA), 150 µA reverse leakage current at 40 V, and 85 pF capacitance at 4 V and 1 MHz. The package format must remain DO-219AB surface mount configuration. Mounting type variation (Tape & Reel versus Cut Tape) does not affect electrical or mechanical compatibility and represents a packaging logistics distinction only. All substitute parts must maintain Active product status, ROHS3 compliance, and MSL Level 1 rating. Automotive-grade qualification (AEC-Q101) is preserved across all identified substitutes.

Parameter Comparison

Parameter	SS1F4HM3/I (Main)	SS1F4-M3/H (Substitute)	SS1F4HM3/H (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 1 A	520 mV @ 1 A	520 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	150 µA @ 40 V	150 µA @ 40 V	150 µA @ 40 V
Capacitance @ Vr, F	85 pF @ 4V, 1MHz	85 pF @ 4V, 1MHz	85 pF @ 4V, 1MHz
Operating Temperature - Junction (Max)	175°C	175°C	175°C
Package / Case	DO-219AB	DO-219AB	DO-219AB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)
Grade	Automotive	Not specified	Automotive
Qualification	AEC-Q101	Not specified	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both substitute parts SS1F4-M3/H and SS1F4HM3/H provide complete electrical and mechanical equivalence to the SS1F4HM3/I. Selection between these options is determined by packaging format requirements and compliance certifications.

SS1F4HM3/H is the direct equivalent when Tape & Reel packaging is required. This part maintains identical automotive-grade classification and AEC-Q101 qualification, making it suitable for applications with automotive compliance mandates. Inventory availability is 21,455 pieces.

SS1F4-M3/H is the equivalent when Cut Tape packaging is acceptable. This part provides identical electrical performance and ROHS3 compliance. Automotive-grade and AEC-Q101 designations are not specified for this variant. Inventory availability is 36,119 pieces, representing higher stock levels.

All three parts share identical base product number SS1F4, confirming design lineage and parametric equivalence. Selection should prioritize application requirements for automotive qualification and packaging logistics.

Frequently Asked Questions (FAQ)

Q: Can SS1F4-M3/H replace SS1F4HM3/I in automotive applications?

A: SS1F4-M3/H provides identical electrical specifications and ROHS3 compliance. However, automotive-grade designation and AEC-Q101 qualification are not specified for this variant. Applications requiring automotive compliance should use SS1F4HM3/H instead.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) packaging supplies components on tape segments cut to specified lengths, suitable for lower-volume or manual assembly operations. Electrical and mechanical performance are identical between packaging formats.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the DO-219AB surface mount package with identical pin configuration and footprint. PCB layout and assembly processes require no modification when substituting between these parts.

Q: Do these parts have identical thermal characteristics?

A: Yes. All three parts share the same maximum junction operating temperature of 175°C and identical thermal performance specifications.

Q: What is the significance of MSL Level 1?

A: Moisture Sensitivity Level 1 (Unlimited) indicates these components have no moisture sensitivity restrictions. Standard storage and handling procedures apply without special desiccant or humidity control requirements.

Q: Can I substitute SS1F4HM3/I with SS1F4-M3/H if my design uses Tape & Reel?

A: No. If your assembly process requires Tape & Reel format, use SS1F4HM3/H. SS1F4-M3/H is supplied in Cut Tape format and would require different handling and feeding equipment.

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