Equivalent & Substitute Parts for SMC Diode Solutions 12TQ045S

Part Overview

The SMC Diode Solutions 12TQ045S is an active Schottky rectifier diode rated for 45V DC reverse voltage and 15A average rectified current in a surface mount D2PAK (TO-263-3) package. This component is designed for high-current rectification applications requiring fast recovery characteristics. The part is ROHS3 compliant and REACH affected, with unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across manufacturing environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	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 @ 45 V
Capacitance @ Vr, F	900	pF @ 5V, 1MHz
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of Schottky rectifier diodes is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage Rating Compatibility: All substitute parts maintain the 45V DC reverse voltage specification, ensuring safe operation in circuits designed for the 12TQ045S.

Current Rating Consideration: The 12TQ045S is rated for 15A average rectified current. Substitute parts are grouped into two categories:

Parametric Equivalent (Full Current Match): VS-12TQ045S-M3 maintains 15A rating with identical forward voltage characteristics
Reduced Current Alternatives: VS-MBRB745-M3 (7.5A) and VS-6TQ045S-M3 (6A) are suitable for applications requiring lower current capacity

Package Compatibility: All substitute parts use the TO-263-3 D2PAK surface mount package with identical pinout (2 Leads + Tab), ensuring mechanical and electrical interchangeability at the PCB level.

Technology and Speed: All parts employ Schottky technology with fast recovery characteristics (≤ 500ns, > 200mA), maintaining switching performance requirements.

Thermal and Compliance Specifications: All substitute parts are ROHS3 compliant with MSL 1 rating. Operating temperature ranges vary slightly but encompass the -55°C to 150°C specification of the main part.

Parameter Comparison

Parameter	12TQ045S (SMC)	VS-12TQ045S-M3 (Vishay)	VS-MBRB745-M3 (Vishay)	VS-6TQ045S-M3 (Vishay)
Manufacturer	SMC Diode Solutions	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	15 A	15 A	7.5 A	6 A
Voltage - Forward (Vf) (Max) @ If	560 mV @ 15 A	560 mV @ 15 A	570 mV @ 7.5 A	600 mV @ 6 A
Speed - Fast Recovery	≤ 500ns, > 200mA	≤ 500ns, > 200mA	≤ 500ns, > 200mA	≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	1 mA @ 45 V	1.75 mA @ 45 V	100 µA @ 45 V	800 µA @ 45 V
Capacitance @ Vr, F	900 pF @ 5V, 1MHz	900 pF @ 5V, 1MHz	400 pF @ 5V, 1MHz	400 pF @ 5V, 1MHz
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C
Technology	Schottky	Schottky	Schottky	Schottky
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

VS-12TQ045S-M3 (Parametric Equivalent): This Vishay part is the direct parametric equivalent to the 12TQ045S, matching all critical electrical specifications including 15A current rating, 560 mV forward voltage at 15A, and 900 pF capacitance. Both parts are ROHS3 compliant with MSL 1 rating and active product status. The primary difference is packaging format (Tube vs. Tape & Reel) and REACH status (Unaffected vs. Affected). This part is suitable for direct substitution in all applications where the 12TQ045S is specified.

VS-MBRB745-M3 (Reduced Current Alternative): This Vishay part operates at 7.5A average rectified current with 570 mV forward voltage and superior reverse leakage characteristics (100 µA vs. 1 mA). The extended operating temperature range (-65°C to 150°C) provides additional thermal margin. This part is suitable for applications where current requirements do not exceed 7.5A and where lower reverse leakage is beneficial. ROHS3 compliance and MSL 1 rating are maintained.

VS-6TQ045S-M3 (Lower Current Alternative): This Vishay part operates at 6A average rectified current with 600 mV forward voltage. The extended upper operating temperature limit (175°C) supports high-temperature applications. This part is suitable for applications where current requirements do not exceed 6A. ROHS3 compliance and MSL 1 rating are maintained.

All substitute parts maintain the D2PAK surface mount package, ensuring PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can VS-12TQ045S-M3 be used as a direct replacement for 12TQ045S?

A: Yes. VS-12TQ045S-M3 is a parametric equivalent with identical voltage rating (45V), current rating (15A), forward voltage (560 mV @ 15A), and capacitance (900 pF @ 5V, 1MHz). Both parts use the TO-263-3 D2PAK package with identical pinout. The primary differences are packaging format and REACH status, which do not affect electrical or mechanical compatibility.

Q: When should VS-MBRB745-M3 or VS-6TQ045S-M3 be used instead of the full 15A equivalent?

A: These reduced-current alternatives are suitable when circuit design specifications require maximum current below their respective ratings (7.5A for MBRB745 and 6A for 6TQ045S). Using a lower-rated part in an application designed for 15A operation will result in thermal stress and potential component failure. Current rating selection must match or exceed the maximum rectified current in the application.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the TO-263-3 D2PAK surface mount package with identical pinout (2 Leads + Tab). No PCB layout modifications are required for substitution.

Q: What is the difference between the SMC 12TQ045S and Vishay VS-12TQ045S-M3 regarding compliance?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The SMC part is REACH Affected, while the Vishay part is REACH Unaffected. For applications subject to REACH regulations, the Vishay part may be preferred. For applications without REACH restrictions, both parts are equivalent.

Q: Can reverse leakage differences between substitute parts affect circuit performance?

A: Reverse leakage specifications vary among the substitute parts (1 mA for 12TQ045S, 1.75 mA for VS-12TQ045S-M3, 100 µA for VS-MBRB745-M3, and 800 µA for VS-6TQ045S-M3). In most rectification applications, these differences are negligible. In precision analog circuits or high-impedance applications, lower reverse leakage may be beneficial. Circuit design requirements determine whether reverse leakage differences are significant.

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

A: Forward voltage differences are minimal across the 15A-rated parts (560 mV for both 12TQ045S and VS-12TQ045S-M3). The reduced-current alternatives show slightly higher forward voltage (570 mV for MBRB745 and 600 mV for 6TQ045S). In rectification applications, these differences result in proportionally small changes to voltage drop and power dissipation. Circuit designs must account for the forward voltage of the selected part.

Q: Are operating temperature ranges interchangeable?

A: Operating temperature ranges vary slightly among substitute parts. The 12TQ045S and VS-12TQ045S-M3 both specify -55°C to 150°C. VS-MBRB745-M3 extends to -65°C minimum, and VS-6TQ045S-M3 extends to 175°C maximum. Selection must ensure the chosen part's operating temperature range encompasses the application's thermal environment.

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