STPS1545CG Equivalent & Substitute Parts

Part Overview

The STPS1545CG is a Schottky diode array manufactured by STMicroelectronics, configured as 1 pair common cathode with a maximum reverse voltage of 45 V and average rectified current of 7.5 A per diode. The component is housed in a TO-263-3 D2PAK surface mount package. The STPS1545CG is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io) (per Diode)	7.5	A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 7.5 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	100	µA @ 45 V
Operating Temperature - Junction (Max)	175	°C
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the STPS1545CG is determined by the following critical parameters: diode configuration (1 pair common cathode), technology (Schottky), maximum reverse voltage (45 V), average rectified current per diode, forward voltage characteristics, package type (TO-263-3 D2PAK), and product status (active vs. obsolete).

Substitute parts are grouped into three categories:

Category 1: Direct Electrical Equivalents (Identical Ratings) Parts with identical 45 V reverse voltage, 7.5 A average rectified current per diode, 1 pair common cathode configuration, and TO-263-3 D2PAK packaging. These parts are pin-compatible and functionally interchangeable without circuit modification.

Category 2: Higher Current Rated Alternatives (Enhanced Capability) Parts with identical 45 V reverse voltage and 1 pair common cathode configuration but rated for 10 A, 15 A, or 20 A average rectified current per diode. These parts operate within the same voltage envelope and package footprint but provide increased current handling capacity. They are electrically compatible for applications where the original 7.5 A rating is marginal.

Category 3: Packaging Variants Parts with identical electrical specifications but different packaging formats (tape and reel vs. bulk). These are suitable for high-volume manufacturing environments requiring automated component handling.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io per Diode [A]	Vf (Max) @ If [mV]	Diode Config	Package	Product Status	RoHS Status
STPS1545CG	STMicroelectronics	45	7.5	570 @ 7.5 A	1 Pair Common Cathode	TO-263-3 D2PAK	Obsolete	ROHS3 Compliant
STPS1545CG-TR	STMicroelectronics	45	7.5	570 @ 7.5 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant
MBRB1545CTT4G	onsemi	45	7.5	570 @ 7.5 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant
MBRB1545CT	Vishay General Semiconductor - Diodes Division	45	7.5	840 @ 7.5 A	1 Pair Common Cathode	TO-263-3 D2PAK	Obsolete	RoHS non-compliant
DSTB2045C	Littelfuse Inc.	45	10	580 @ 10 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant
15CTQ045S	SMC Diode Solutions	45	15	840 @ 15 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant
MBRB1545	SMC Diode Solutions	45	15	700 @ 15 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant
12TQ045S	Vishay General Semiconductor - Diodes Division	45	15	560 @ 15 A	Single Diode	TO-263-3 D2PAK	Obsolete	RoHS non-compliant
DSSK28-0045BS-TRL	IXYS	45	15	480 @ 15 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant
VS-40CTQ045STRL-M3	Vishay General Semiconductor - Diodes Division	45	20	530 @ 20 A	1 Pair Common Cathode	TO-263-3 D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: STPS1545CG-TR

The STPS1545CG-TR is the direct active equivalent of the obsolete STPS1545CG. Manufactured by STMicroelectronics, it provides identical electrical specifications: 45 V reverse voltage, 7.5 A average rectified current per diode, 570 mV forward voltage at 7.5 A, and 1 pair common cathode configuration in TO-263-3 D2PAK packaging. The part is ROHS3 compliant and available in tape and reel packaging format. This substitution requires no circuit modification and maintains full design compatibility.

Secondary Recommendation: MBRB1545CTT4G

The MBRB1545CTT4G, manufactured by onsemi under the SWITCHMODE™ series, matches the STPS1545CG electrical specifications exactly: 45 V reverse voltage, 7.5 A average rectified current per diode, 570 mV forward voltage at 7.5 A, and 1 pair common cathode configuration. The part is ROHS3 compliant, active in production, and available in tape and reel format. Operating temperature range extends to 175°C maximum junction temperature, matching the original specification.

Higher Current Alternatives for Margin Applications

For applications requiring increased current margin, the following active parts provide enhanced current ratings while maintaining 45 V reverse voltage and 1 pair common cathode configuration:

DSTB2045C (Littelfuse Inc.): 10 A average rectified current per diode, 580 mV forward voltage at 10 A, ROHS3 compliant, active status.

15CTQ045S (SMC Diode Solutions): 15 A average rectified current per diode, 840 mV forward voltage at 15 A, ROHS3 compliant, active status.

MBRB1545 (SMC Diode Solutions): 15 A average rectified current per diode, 700 mV forward voltage at 15 A, ROHS3 compliant, active status.

DSSK28-0045BS-TRL (IXYS): 15 A average rectified current per diode, 480 mV forward voltage at 15 A, ROHS3 compliant, active status.

VS-40CTQ045STRL-M3 (Vishay General Semiconductor - Diodes Division): 20 A average rectified current per diode, 530 mV forward voltage at 20 A, ROHS3 compliant, active status.

Obsolete Parts to Avoid

MBRB1545CT (Vishay) and 12TQ045S (Vishay) are classified as obsolete and RoHS non-compliant. These parts should not be selected for new designs or long-term procurement strategies.

Frequently Asked Questions (FAQ)

Q: Can STPS1545CG-TR be used as a direct replacement for STPS1545CG?

A: Yes. STPS1545CG-TR is the active production equivalent of the obsolete STPS1545CG. Both parts share identical electrical specifications: 45 V reverse voltage, 7.5 A average rectified current per diode, 570 mV forward voltage at 7.5 A, 1 pair common cathode configuration, and TO-263-3 D2PAK packaging. The primary difference is packaging format (tape and reel vs. bulk) and active production status. No circuit modification is required.

Q: What is the difference between STPS1545CG and MBRB1545CTT4G?

A: Both parts have identical electrical specifications: 45 V reverse voltage, 7.5 A average rectified current per diode, 570 mV forward voltage at 7.5 A, and 1 pair common cathode configuration in TO-263-3 D2PAK packaging. The primary differences are manufacturer (STMicroelectronics vs. onsemi), product series designation (SWITCHMODE™ for onsemi), and operating temperature range (-65°C to 175°C for MBRB1545CTT4G vs. -55°C to 175°C for STPS1545CG). Both are ROHS3 compliant and active in production.

Q: Can I use a 15 A rated part like MBRB1545 or 15CTQ045S instead of the 7.5 A STPS1545CG?

A: Yes, higher current rated parts are electrically compatible substitutes. Parts rated for 15 A average rectified current per diode operate within the same 45 V reverse voltage envelope and maintain 1 pair common cathode configuration. They are pin-compatible in TO-263-3 D2PAK packaging. The higher current rating provides additional design margin but does not affect circuit operation at the original 7.5 A design point. Forward voltage characteristics differ slightly (700 mV to 840 mV at 15 A vs. 570 mV at 7.5 A), which may impact power dissipation calculations in high-current applications.

Q: What is the significance of the "-TR" suffix in STPS1545CG-TR?

A: The "-TR" suffix indicates tape and reel packaging format, suitable for automated pick-and-place assembly in high-volume manufacturing. The electrical specifications and component functionality are identical to the bulk-packaged STPS1545CG. Selection between bulk and tape-and-reel formats depends on manufacturing process requirements and volume.

Q: Are all substitute parts ROHS3 compliant?

A: No. MBRB1545CT and 12TQ045S are classified as RoHS non-compliant and should not be selected for new designs or applications requiring RoHS compliance. All other substitute parts listed (STPS1545CG-TR, MBRB1545CTT4G, DSTB2045C, 15CTQ045S, MBRB1545, DSSK28-0045BS-TRL, VS-40CTQ045STRL-M3) are ROHS3 compliant.

Q: What is the difference between 1 pair common cathode and single diode configurations?

A: The STPS1545CG is configured as 1 pair common cathode, meaning two diodes share a common cathode terminal within the same package. This configuration is suitable for bridge rectifier applications and dual-diode circuits. Single diode configurations like 12TQ045S contain only one diode element. For direct substitution of the STPS1545CG, parts with 1 pair common cathode configuration must be selected to maintain circuit compatibility.

Q: Can DSSK28-0045BS-TRL be used as a substitute despite lower forward voltage?

A: Yes. DSSK28-0045BS-TRL has a forward voltage of 480 mV at 15 A, which is lower than the STPS1545CG specification of 570 mV at 7.5 A. Lower forward voltage reduces power dissipation and heat generation, which is beneficial in most applications. The part maintains 45 V reverse voltage, 1 pair common cathode configuration, and TO-263-3 D2PAK packaging. It is ROHS3 compliant and active in production.

Q: What is the operating temperature range consideration for substitution?

A: The STPS1545CG specifies a maximum junction temperature of 175°C. MBRB1545CTT4G also reaches 175°C maximum. Other substitutes (MBRB1545CT, DSTB2045C, 15CTQ045S, MBRB1545, 12TQ045S, DSSK28-0045BS-TRL, VS-40CTQ045STRL-M3) specify maximum junction temperatures of 150°C. For applications operating near thermal limits, STPS1545CG-TR or MBRB1545CTT4G are preferred to maintain the original 175°C specification.

Q: Is moisture sensitivity a concern for substitution?

A: All listed substitute parts have Moisture Sensitivity Level (MSL) of 1 (Unlimited), identical to the STPS1545CG. This indicates no special moisture handling or baking requirements during storage and assembly. Substitution does not introduce moisture sensitivity concerns.

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