SB150 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SB150 is a through-hole Schottky rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-41 axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SB150 serves in fast-recovery rectification applications requiring low forward voltage drop and rapid switching characteristics typical of Schottky technology.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 50 V
Capacitance @ Vr, F	110	pF @ 4V, 1MHz
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-60 to 125	°C
Technology	Schottky	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SB150 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Technology: Schottky (fast-recovery rectifier)
Mounting Type: Through Hole
Package / Case: DO-41 or Axial compatible form factors

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 700 mV to 750 mV @ 1 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: Acceptable range 50 µA to 500 µA
Operating Temperature - Junction: Acceptable range -65°C to 150°C

Substitute parts are grouped into two categories based on electrical performance alignment with the SB150 specification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	Temp Range [°C]
SB150	onsemi	50	1	700 @ 50V	500 @ 50V	DO-41	Obsolete	-60 to 125
MBR150RLG	onsemi	50	1	750 @ 50V	500 @ 50V	Axial	Active	-65 to 150
MBR150G	onsemi	50	1	750 @ 50V	500 @ 50V	Axial	Obsolete	-65 to 150
SB150-T	Diodes Incorporated	50	1	700 @ 50V	500 @ 50V	DO-41	Active	-65 to 150
1N5819	Microchip Technology	45	1	490 @ 45V	50 @ 45V	DO-41	Active	-65 to 125
1N5819G	Microchip Technology	40	1	600 @ 40V	1000 @ 40V	DO-41	Active	-65 to 150
1N5819-BP	Micro Commercial Co	40	1	600 @ 40V	1000 @ 40V	DO-41	Active	-55 to 125

Engineering Selection Recommendations

Category 1: Direct Electrical Equivalents (50 V, 1 A Rating)

The following parts meet or exceed all primary electrical specifications of the SB150:

MBR150RLG (onsemi): Active product status with ROHS3 compliance. Identical voltage and current ratings. Extended operating temperature range (-65°C to 150°C) compared to SB150. Axial package form factor. Recommended for new designs requiring active product support.
SB150-T (Diodes Incorporated): Active product status with ROHS3 compliance. Identical electrical specifications to SB150 (50 V, 1 A, 700 mV Vf). DO-41 package maintains form-factor compatibility. Extended operating temperature range (-65°C to 150°C). Direct replacement for through-hole applications.
MBR150G (onsemi): Obsolete status. Electrical equivalence to SB150 with 50 mV higher forward voltage (750 mV). Axial package. Not recommended for new procurement due to obsolescence.

Category 2: Reduced Voltage Ratings (40-45 V)

The following parts operate at reduced reverse voltage ratings and are suitable only for applications where the 50 V specification is not required:

1N5819 (Microchip Technology): 45 V rating. Active product with high inventory availability. Lower forward voltage (490 mV @ 45 V) and significantly lower reverse leakage (50 µA @ 45 V). DO-41 package. Suitable for circuits operating below 45 V.
1N5819G (Microchip Technology): 40 V rating. Active product. Forward voltage 600 mV @ 40 V. Reverse leakage 1 mA @ 40 V. Extended temperature range (-65°C to 150°C). DO-41 package. Suitable for circuits operating below 40 V.
1N5819-BP (Micro Commercial Co): 40 V rating. Active product. Identical electrical characteristics to 1N5819G. DO-41 package. Limited temperature range (-55°C to 125°C). Suitable for circuits operating below 40 V with standard temperature requirements.

Selection Guidance:

For applications requiring the full 50 V reverse voltage specification, select SB150-T (Diodes Incorporated) as the primary active equivalent. For applications where 50 V is not required and lower forward voltage is beneficial, 1N5819 (Microchip Technology) provides active product status with superior electrical characteristics at reduced voltage rating.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5819 as a direct replacement for SB150?

A: No. The 1N5819 is rated for 45 V maximum reverse voltage, while the SB150 is rated for 50 V. Use 1N5819 only in circuits where the operating voltage does not exceed 45 V. For full 50 V capability, use SB150-T or MBR150RLG.

Q: What is the difference between MBR150RLG and MBR150G?

A: Both parts have identical electrical specifications (50 V, 1 A, 750 mV Vf). MBR150RLG is active product status with ROHS3 compliance and extended temperature range (-65°C to 150°C). MBR150G is obsolete. Use MBR150RLG for new designs.

Q: Are SB150 and SB150-T pin-compatible?

A: Yes. Both use DO-41 axial through-hole package with identical pin configuration. SB150-T is the active equivalent manufactured by Diodes Incorporated.

Q: Can I substitute MBR150RLG (Axial package) for SB150 (DO-41 package) on a PCB?

A: Yes, if the PCB layout accommodates axial lead spacing. Both are through-hole components with compatible electrical specifications. Verify PCB hole spacing and lead length requirements before substitution.

Q: Why does 1N5819-BP have a lower temperature range than 1N5819G?

A: 1N5819-BP is rated -55°C to 125°C, while 1N5819G is rated -65°C to 150°C. Both are manufactured by different suppliers (Micro Commercial Co vs. Microchip Technology). Select based on your application's temperature requirements.

Q: Is MBR150RLG ROHS3 compliant?

A: Yes. MBR150RLG carries ROHS3 compliance certification. SB150 (obsolete) does not list ROHS status. For applications requiring ROHS compliance, use MBR150RLG or SB150-T.

Q: What is the reverse leakage difference between SB150 and 1N5819?

A: SB150 has 500 µA reverse leakage @ 50 V. 1N5819 has 50 µA reverse leakage @ 45 V. The 1N5819 exhibits significantly lower leakage current, which may be beneficial in low-power applications but is only valid at 45 V maximum.

Q: Can I use 1N5819-BP in a circuit designed for -60°C operation?

A: No. 1N5819-BP is rated only to -55°C minimum. Use 1N5819G (rated -65°C to 150°C) or SB150-T (rated -65°C to 150°C) for applications requiring -60°C operation.

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