12TQ035 Schottky Diode Equivalent & Substitute Parts

Part Overview

The 12TQ035 is a Schottky rectifier diode manufactured by SMC Diode Solutions, rated for 35 V DC reverse voltage and 15 A average rectified current in a Through Hole TO-220AC package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when the original part becomes unavailable, when inventory constraints exist, or when design flexibility permits operation within the electrical and mechanical parameters of alternative qualified components.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 35 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-55 to 175	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 12TQ035 is determined by the following electrical and mechanical criteria:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 35 V
Package / Case: TO-220-2 (mechanical compatibility)
Mounting Type: Through Hole
Technology: Schottky

Allowable Variation Parameters:

Current - Average Rectified (Io): Substitute must equal or exceed 15 A
Voltage - Forward (Vf) (Max) @ If: Substitute must not exceed the original specification
Operating Temperature - Junction: Substitute must cover or exceed the original range
RoHS Status: Substitute must maintain ROHS3 compliance

The MBR735G from onsemi meets the voltage and package requirements but operates at a reduced current rating of 7.5 A, which is below the 15 A specification of the 12TQ035. This part is therefore classified as a partial substitute suitable only for applications requiring current ratings at or below 7.5 A.

Parameter Comparison

Parameter	12TQ035 (SMC)	MBR735G (onsemi)	Match Status
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	Match
Current - Average Rectified (Io)	15 A	7.5 A	Reduced
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	840 mV @ 15 A	Higher
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Match
Current - Reverse Leakage @ Vr	1 mA @ 35 V	100 µA @ 35 V	Lower (Better)
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-220-2	TO-220-2	Match
Operating Temperature - Junction	-55 to 175°C	-65 to 175°C	Extended Range
Technology	Schottky	Schottky	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Product Status	Active	Obsolete	Difference

Engineering Selection Recommendations

12TQ035 (SMC Diode Solutions): The 12TQ035 is the primary component selection. It maintains Active product status, ensuring continued availability and manufacturer support. The part is RoHS3 compliant and REACH affected, meeting current regulatory requirements. Current rating of 15 A and forward voltage of 560 mV @ 15 A establish the baseline performance specification for this application category.

MBR735G (onsemi): The MBR735G is classified as Obsolete and should be selected only when the 12TQ035 is unavailable and application requirements permit operation at 7.5 A or below. The MBR735G is RoHS3 compliant but REACH unaffected. The higher forward voltage (840 mV @ 15 A) and reduced current rating make this part unsuitable for applications requiring the full 15 A specification of the 12TQ035. The extended operating temperature range (-65 to 175°C) provides additional thermal margin compared to the 12TQ035 (-55 to 175°C).

Frequently Asked Questions (FAQ)

Q: Can the MBR735G directly replace the 12TQ035 in all applications?

A: No. The MBR735G has a maximum average rectified current of 7.5 A, which is 50% lower than the 12TQ035 specification of 15 A. Direct substitution is limited to applications operating at 7.5 A or below. Applications requiring the full 15 A rating must use the 12TQ035 or an equivalent part with matching current specifications.

Q: Are the packages physically identical?

A: Both parts use the TO-220-2 package with Through Hole mounting. Physical dimensions and pin configurations are compatible, allowing mechanical interchangeability in PCB layouts designed for TO-220-2 components.

Q: What is the impact of the higher forward voltage in the MBR735G?

A: The MBR735G exhibits 840 mV forward voltage at 15 A compared to 560 mV for the 12TQ035. This 280 mV difference increases power dissipation and heat generation. Applications with thermal constraints or tight power budgets should account for this increased voltage drop.

Q: Why is the MBR735G listed as Obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. While inventory may remain available through distributors, long-term availability is not guaranteed. The 12TQ035 (Active status) is the recommended selection for new designs and ongoing production.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 12TQ035 and MBR735G are RoHS3 compliant. However, the 12TQ035 is REACH affected while the MBR735G is REACH unaffected. Applications subject to REACH regulations should verify compliance requirements with the specific end-use jurisdiction.

Q: What is the difference in reverse leakage current?

A: The 12TQ035 has 1 mA reverse leakage at 35 V, while the MBR735G has 100 µA at 35 V. The MBR735G exhibits lower leakage, which may be beneficial in low-power or high-impedance circuit applications.

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