SB330/4 Equivalent & Substitute Parts

Part Overview

The SB330/4 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 30 V DC reverse voltage and 3 A average rectified current in a through-hole DO-201AD axial package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	490	mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 30 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitute parts for the SB330/4 are qualified based on the following electrical and mechanical criteria:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 30 V
Current - Average Rectified (Io): Equal to or greater than 3 A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature - Junction: Range must encompass or exceed -65°C to 125°C

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: DO-201AD, Axial or equivalent axial through-hole package

Compliance Considerations:

RoHS Status: Active substitutes must be RoHS3 Compliant
Product Status: Active status preferred for ongoing availability

The following substitute parts meet these criteria and are grouped by manufacturer and product status.

Parameter Comparison

Parameter	SB330/4 (Main)	SB330-E3/54	1N5821	1N5821 A0G	1N5821RLG	31DQ03
Manufacturer	Vishay	Vishay	Microchip	Taiwan Semiconductor	onsemi	SMC Diode Solutions
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A	3.3 A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 3 A	490 mV @ 3 A	500 mV @ 3 A	500 mV @ 3 A	500 mV @ 3 A	570 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 30 V	500 µA @ 30 V	100 µA @ 30 V	500 µA @ 30 V	2 mA @ 30 V	1 mA @ 30 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	DO-201AD, Axial	B, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial
Operating Temperature - Junction	-65 to 125°C	-65 to 125°C	-65 to 125°C	-55 to 125°C	-65 to 125°C	-40 to 150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: SB330-E3/54

The SB330-E3/54 manufactured by Vishay General Semiconductor - Diodes Division is the direct parametric equivalent to the SB330/4. This part maintains identical electrical specifications (30 V, 3 A, 490 mV forward voltage) and mechanical compatibility (DO-201AD package). The SB330-E3/54 is active in production status and RoHS3 compliant, addressing the obsolescence of the original part while preserving design compatibility. Inventory availability is 5500 pieces.

Secondary Substitutes: 1N5821 Series

The 1N5821 family from multiple manufacturers (Microchip Technology, Taiwan Semiconductor Corporation, and onsemi) provides functional equivalence with minor parameter variations. All 1N5821 variants maintain 30 V reverse voltage and 3 A current ratings with fast recovery characteristics. Forward voltage specifications range from 500 mV to 510 mV at 3 A, representing a 10 mV increase from the SB330/4 baseline. All 1N5821 variants are active in production and RoHS3 compliant.

1N5821 (Microchip): Axial package (B, Axial), 2069 pieces in stock
1N5821 A0G (Taiwan Semiconductor): DO-201AD package, 882 pieces in stock, operating range -55°C to 125°C
1N5821RLG (onsemi): Axial package (DO-201AA, DO-27), 4654 pieces in stock

Tertiary Substitute: 31DQ03

The 31DQ03 manufactured by SMC Diode Solutions provides functional equivalence with enhanced current rating (3.3 A versus 3 A) and extended operating temperature range (-40°C to 150°C). Forward voltage is specified at 570 mV at 3 A, representing a 80 mV increase from the SB330/4. This part is active in production, RoHS3 compliant, and available in DO-201AD package with 1381 pieces in stock.

Compliance Status:

All recommended substitutes are RoHS3 compliant and REACH unaffected, addressing regulatory requirements for new designs. The SB330-E3/54 is the preferred selection for direct replacement due to identical electrical specifications and package compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SB330-E3/54 be used as a direct replacement for the SB330/4?

A: Yes. The SB330-E3/54 is electrically and mechanically identical to the SB330/4, with matching 30 V reverse voltage, 3 A current rating, 490 mV forward voltage, and DO-201AD axial package. The primary difference is product status: SB330-E3/54 is active in production while SB330/4 is obsolete.

Q: What is the difference between the 1N5821 variants from different manufacturers?

A: All 1N5821 variants meet the core electrical requirements (30 V, 3 A, fast recovery). Differences include forward voltage specification (500 mV for Microchip and onsemi; 500 mV for Taiwan Semiconductor), reverse leakage current (100 µA for Microchip; 500 µA for Taiwan Semiconductor; 2 mA for onsemi), and package designation (B, Axial for Microchip; DO-201AD for Taiwan Semiconductor; DO-201AA/DO-27 for onsemi). All are RoHS3 compliant and active in production.

Q: Is the 31DQ03 suitable for applications requiring the exact SB330/4 specifications?

A: The 31DQ03 meets the core voltage and current requirements (30 V, 3.3 A) and fast recovery characteristics. However, forward voltage is specified at 570 mV at 3 A, which is 80 mV higher than the SB330/4 baseline of 490 mV. This difference may affect circuit performance in applications with tight voltage margin requirements. The 31DQ03 is suitable for applications where the higher forward voltage is acceptable.

Q: Are all substitute parts available in the same package as the SB330/4?

A: The SB330-E3/54, 1N5821 A0G, and 31DQ03 are available in DO-201AD axial packages matching the SB330/4. The 1N5821 from Microchip is designated as B, Axial package, and the 1N5821RLG from onsemi is designated as DO-201AA, DO-27, Axial. All are through-hole axial packages suitable for the same PCB footprint.

Q: What is the impact of forward voltage differences on circuit design?

A: Forward voltage differences directly affect voltage drop across the diode during conduction. The SB330/4 and SB330-E3/54 specify 490 mV at 3 A. The 1N5821 variants specify 500 mV at 3 A (10 mV increase). The 31DQ03 specifies 570 mV at 3 A (80 mV increase). In power supply and rectification circuits, these differences accumulate as heat dissipation and output voltage regulation. Applications with tight voltage margins require evaluation of the specific forward voltage impact.

Q: Which substitute offers the best long-term availability?

A: The SB330-E3/54 is the recommended choice for long-term availability, as it is the direct Vishay equivalent with active production status and 5500 pieces in current inventory. The 1N5821RLG from onsemi offers the highest current inventory (4654 pieces) among the 1N5821 variants.

Q: Are there temperature range considerations when selecting a substitute?

A: The SB330/4 operates from -65°C to 125°C. The SB330-E3/54 and most 1N5821 variants maintain this range. The 1N5821 A0G from Taiwan Semiconductor operates from -55°C to 125°C, which is narrower at the low end. The 31DQ03 operates from -40°C to 150°C, which is narrower at the low end but extended at the high end. Applications requiring operation below -55°C should use the SB330-E3/54, 1N5821RLG, or original SB330/4 specifications.

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