SS33 R7G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS33 R7G is a 30V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and repair applications. The part operates across a junction temperature range of -55°C to 125°C and exhibits fast recovery characteristics suitable for high-frequency switching applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	30	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 3 A	mV @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 30 V
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS33 R7G is determined by strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) Maximum: 30V (exact match required)
Current - Average Rectified (Io): 3A minimum (equal or higher acceptable)
Voltage - Forward (Vf) Maximum @ If: 500mV @ 3A or lower (lower forward voltage preferred)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (required for switching applications)
Current - Reverse Leakage @ Vr: 500µA @ 30V or lower (lower leakage preferred)

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount (required)
Package / Case: DO-214AB, SMC or equivalent surface mount packages (SMA, SMB acceptable with PCB layout adjustment)
Operating Temperature - Junction: -55°C minimum to 125°C minimum (higher maximum temperature acceptable)

Compliance Requirements:

RoHS Status: ROHS3 Compliant preferred for new designs
Technology: Schottky (required for functional equivalence)

Parts are grouped into three categories:

Direct Equivalents (Same Package - DO-214AB SMC): Parts maintaining identical package and electrical specifications within tolerance.

Package Variants (Alternative Surface Mount Packages): Parts with identical electrical specifications but different surface mount packages (SMA, SMB) requiring PCB layout modification.

Upgraded Alternatives (Higher Current Rating): Parts exceeding the 3A current specification, suitable for applications requiring additional current margin or future design flexibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (mV)	Reverse Leakage @ Vr (µA)	Package	Temp Range (°C)	Product Status	RoHS Status
SS33 R7G	Taiwan Semiconductor Corporation	30	3	500 @ 3A	500 @ 30V	DO-214AB, SMC	-55 to 125	Discontinued	ROHS3 Compliant
B330A-13-F	Diodes Incorporated	30	3	500 @ 3A	500 @ 30V	DO-214AC, SMA	-55 to 150	Active	ROHS3 Compliant
B330B-13-F	Diodes Incorporated	30	3	500 @ 3A	500 @ 30V	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
SS33	Fairchild Semiconductor	30	3	500 @ 3A	500 @ 30V	DO-214AB, SMC	-55 to 150	Active	Not specified
SK33-TP	Micro Commercial Co	30	3	500 @ 3A	500 @ 30V	DO-214AB, SMC	-55 to 150	Not For New Designs	ROHS3 Compliant
5821SMJ/TR13	Microchip Technology	30	3	480 @ 3A	1500 @ 30V	DO-214AB, SMC	-55 to 150	Active	RoHS non-compliant
5821SMJE3/TR13	Microchip Technology	30	3	480 @ 3A	1500 @ 30V	DO-214AB, SMC	-55 to 150	Active	ROHS3 Compliant
B330Q-13-F	Diodes Incorporated	30	3	500 @ 3A	500 @ 30V	DO-214AB, SMC	-55 to 150	Active	ROHS3 Compliant
B530C-13-F	Diodes Incorporated	30	5	550 @ 5A	500 @ 30V	DO-214AB, SMC	-55 to 150	Active	ROHS3 Compliant
B530CQ-13-F	Diodes Incorporated	30	5	700 @ 5A	500 @ 30V	DO-214AB, SMC	-55 to 150	Active	ROHS3 Compliant
HSM830J/TR13	Microchip Technology	30	8	620 @ 8A	250 @ 30V	DO-214AB, SMC	-55 to 175	Active	RoHS non-compliant

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Electrical Specifications):

The B330Q-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains identical electrical specifications (30V, 3A, 500mV forward voltage, 500µA reverse leakage) in the same DO-214AB SMC package. The part is Active status, ROHS3 compliant, and carries AEC-Q101 automotive qualification. Operating temperature range extends to 150°C, providing additional thermal margin compared to the original SS33 R7G specification of 125°C.

The SS33 (Fairchild Semiconductor) provides an alternative direct equivalent in the same package with identical electrical parameters. This part is Active status and maintains the DO-214AB SMC package footprint. RoHS compliance status is not specified in available documentation.

For Package-Variant Substitution (Electrical Equivalence with Different Package):

The B330A-13-F (Diodes Incorporated, SMA package) and B330B-13-F (Diodes Incorporated, SMB package) provide electrical equivalence with alternative surface mount packages. These substitutions require PCB layout modification to accommodate different package footprints. Both parts are Active status and ROHS3 compliant with AEC-Q101 qualification.

For RoHS3 Compliance with Identical Package:

The 5821SMJE3/TR13 (Microchip Technology) maintains the DO-214AB SMC package and achieves ROHS3 compliance. Forward voltage is reduced to 480mV @ 3A (improved efficiency), but reverse leakage increases to 1500µA @ 30V. This part is Active status and suitable for new designs requiring RoHS3 certification.

For Higher Current Applications (Upgraded Alternatives):

The B530C-13-F (Diodes Incorporated, 5A rating) and B530CQ-13-F (Diodes Incorporated, 5A rating with automotive qualification) provide increased current capacity in the same DO-214AB SMC package. These parts maintain 30V reverse voltage specification and are suitable for applications requiring current margin above 3A. Both are Active status and ROHS3 compliant.

The HSM830J/TR13 (Microchip Technology, 8A rating) provides maximum current capacity with extended operating temperature to 175°C. This part is Active status but RoHS non-compliant.

Parts Not Recommended for New Designs:

The SK33-TP (Micro Commercial Co) is designated "Not For New Designs" and should not be selected for new product development, despite electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can I use B330A-13-F (SMA package) as a direct replacement for SS33 R7G (SMC package)?

A: B330A-13-F provides electrical equivalence but requires PCB layout modification. The SMA package has a different footprint than the DO-214AB SMC package. Verify PCB pad layout compatibility before substitution. If PCB modification is not feasible, select B330Q-13-F or SS33 (both DO-214AB SMC package).

Q: What is the difference between B330Q-13-F and B330B-13-F?

A: B330Q-13-F uses DO-214AB SMC package; B330B-13-F uses DO-214AA SMB package. Electrical specifications are identical (30V, 3A, 500mV forward voltage). Package selection depends on PCB footprint requirements.

Q: Is 5821SMJE3/TR13 suitable for replacement if RoHS3 compliance is required?

A: Yes. 5821SMJE3/TR13 is ROHS3 compliant and maintains DO-214AB SMC package compatibility. Forward voltage is reduced to 480mV @ 3A (beneficial for efficiency), but reverse leakage increases to 1500µA @ 30V. Verify reverse leakage specification meets application requirements before selection.

Q: Can I use B530C-13-F (5A rating) instead of SS33 R7G (3A rating)?

A: Yes. B530C-13-F maintains 30V reverse voltage and DO-214AB SMC package. The 5A current rating exceeds the 3A requirement, providing design margin. Forward voltage increases to 550mV @ 5A. Verify circuit design accommodates the higher forward voltage drop before substitution.

Q: Why is SK33-TP marked "Not For New Designs"?

A: SK33-TP is designated "Not For New Designs" by the manufacturer. This classification indicates the part is in end-of-life status or has been superseded. Select alternative parts for new product development.

Q: What is the operating temperature difference between SS33 R7G and recommended substitutes?

A: SS33 R7G operates -55°C to 125°C. Most recommended substitutes (B330Q-13-F, B330A-13-F, B330B-13-F, 5821SMJE3/TR13) extend to -55°C to 150°C, providing 25°C additional thermal margin. HSM830J/TR13 extends to -55°C to 175°C. Verify application thermal requirements before selection.

Q: Are all recommended substitutes automotive qualified?

A: B330Q-13-F, B330A-13-F, and B330B-13-F carry AEC-Q101 automotive qualification. 5821SMJE3/TR13, B530C-13-F, B530CQ-13-F, and HSM830J/TR13 do not specify AEC-Q101 qualification in provided documentation. Verify automotive qualification requirements for your application.

Q: What is the difference between B530C-13-F and B530CQ-13-F?

A: Both are 5A rated Schottky diodes in DO-214AB SMC package at 30V. B530CQ-13-F carries AEC-Q101 automotive qualification and forward voltage is 700mV @ 5A. B530C-13-F forward voltage is 550mV @ 5A without automotive qualification. Select based on automotive requirement and acceptable forward voltage drop.

Q: Can HSM830J/TR13 (8A rating) be used in place of SS33 R7G (3A rating)?

A: Yes, electrically. HSM830J/TR13 maintains 30V reverse voltage and DO-214AB SMC package. The 8A current rating provides substantial design margin. Forward voltage is 620mV @ 8A. HSM830J/TR13 is RoHS non-compliant; verify compliance requirements before selection.

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