SB1245 Equivalent & Substitute Parts

Part Overview

The SB1245 is a Schottky rectifier diode manufactured by onsemi, rated for 45 V DC reverse voltage and 12 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design alternatives. The SB1245 serves applications requiring fast recovery Schottky diode performance with moderate voltage and current ratings in through-hole form factor.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	12 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 12 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SB1245 is determined by the following critical parameters: voltage rating (Vr), current rating (Io), forward voltage drop (Vf), package type (DO-201AD), mounting configuration (through-hole axial), and technology classification (Schottky with fast recovery). Substitute parts must maintain electrical compatibility within the application's voltage and current requirements while preserving the same physical form factor and thermal characteristics.

The substitute parts are grouped into two categories based on current-handling capability:

Category 1: Direct Current Rating Match (12 A) Parts maintaining the full 12 A current rating with compatible voltage specifications.

Category 2: Reduced Current Rating (3 A to 5 A) Parts with lower current ratings suitable for applications with reduced current demands or as design alternatives where full 12 A capacity is not required.

All substitute parts share the DO-201AD axial through-hole package, fast recovery Schottky technology, and ROHS3 compliance with the main part.

Parameter Comparison

Parameter	SB1245 (onsemi)	SK12H45 (TSC)	SB550-E3/54 (Vishay)	SB550-E3/73 (Vishay)	SB350-E3/54 (Vishay)	SB350-E3/73 (Vishay)	SR305-TP (MCC)
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	12 A	12 A	5 A	5 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 12 A	550 mV @ 12 A	650 mV @ 5 A	650 mV @ 5 A	680 mV @ 3 A	680 mV @ 3 A	720 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 45 V	120 µA @ 45 V	500 µA @ 50 V	500 µA @ 50 V	500 µA @ 50 V	500 µA @ 50 V	1 mA @ 50 V
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	200°C (Max)	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (12 A Current Rating)

The SK12H45 manufactured by Taiwan Semiconductor Corporation is the direct equivalent to the SB1245. Both parts share identical voltage (45 V), current (12 A), and forward voltage specifications (550 mV @ 12 A). The SK12H45 is classified as active product status, ensuring continued availability and supply chain support. This part is suitable for direct replacement in existing designs requiring the full 12 A current capacity.

Alternative Substitutes (Reduced Current Ratings)

The SB550-E3/54 and SB550-E3/73 from Vishay General Semiconductor provide 5 A current capacity with 50 V voltage rating. These parts are suitable for applications where current requirements do not exceed 5 A. Both variants are active products with established supply availability.

The SB350-E3/54 and SB350-E3/73 from Vishay General Semiconductor provide 3 A current capacity with 50 V voltage rating. These parts are suitable for lower-current applications and are active products.

The SR305-TP from Micro Commercial Co is classified as "Not For New Designs" and carries higher reverse leakage current (1 mA @ 50 V) compared to the main part. This part is not recommended for new design implementations.

All active substitute parts maintain ROHS3 compliance and fast recovery Schottky technology consistent with the SB1245 specification.

Frequently Asked Questions (FAQ)

Q: Can the SK12H45 be used as a direct replacement for the SB1245?

A: Yes. The SK12H45 shares identical electrical specifications: 45 V reverse voltage, 12 A average rectified current, and 550 mV forward voltage drop at 12 A. Both use the DO-201AD axial through-hole package. The SK12H45 is an active product, making it suitable for direct substitution in existing applications.

Q: What is the difference between the SB550 and SB350 series substitutes?

A: The primary difference is current rating. The SB550 series is rated for 5 A average rectified current, while the SB350 series is rated for 3 A. Both share 50 V reverse voltage rating and DO-201AD package. Selection depends on the application's current requirements. The SB550 series provides higher current capacity for more demanding applications.

Q: Why do the SB350 and SB550 parts have higher voltage ratings (50 V) than the SB1245 (45 V)?

A: Higher voltage ratings provide additional design margin and are not incompatible with 45 V applications. A 50 V rated diode operates safely in circuits designed for 45 V maximum reverse voltage. The higher rating does not degrade performance in lower-voltage applications.

Q: Are the SB350-E3/54 and SB350-E3/73 interchangeable?

A: Yes. Both parts share identical electrical specifications and DO-201AD package. The designation suffix indicates different tape and reel configurations for manufacturing and supply purposes. Electrical performance and compatibility are equivalent.

Q: Can the SR305-TP be used as a substitute?

A: The SR305-TP is classified as "Not For New Designs" and exhibits higher reverse leakage current (1 mA @ 50 V) compared to the SB1245 (100 µA @ 45 V). While physically compatible in the DO-201AD package, this part is not recommended for new design implementations due to its obsolescence status and elevated leakage characteristics.

Q: What are the thermal operating range differences between substitutes?

A: The SB1245 and SR305-TP operate from -55°C to 150°C and -55°C to 125°C respectively. The SK12H45 specifies a maximum junction temperature of 200°C. The Vishay SB350 and SB550 series operate from -65°C to 150°C. Selection should account for application thermal requirements and ambient operating conditions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts, including the SK12H45, SB550 series, SB350 series, and SR305-TP, are ROHS3 compliant and REACH unaffected, matching the compliance status of the SB1245.

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