STPS1545G Equivalent & Substitute Parts

Part Overview

The STPS1545G is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 45 V DC reverse voltage and 15 A average rectified current in a surface mount D2PAK (TO-263-3) package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and operates at junction temperatures up to 175°C maximum.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 30 A	mV @ A
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the STPS1545G is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io): 15 A minimum
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB or compatible variant

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: May vary within acceptable circuit design margins
Current - Reverse Leakage @ Vr: May vary; lower values preferred
Operating Temperature - Junction: May exceed 175°C maximum
RoHS Status: ROHS3 compliance preferred but not mandatory for obsolete part replacement
Product Status: Active or Last Time Buy status acceptable for obsolete part substitution

Substitute parts are grouped into two categories: Direct Equivalents (matching all critical parameters) and Similar Alternatives (matching voltage and current ratings with minor package or performance variations).

Parameter Comparison

Parameter	STPS1545G (Main)	12TQ045S	MBRB1545	MBRB1545CT	DSS16-0045AS-TRL	MBRB1645-E3/45
Manufacturer	STMicroelectronics	Vishay General Semiconductor	SMC Diode Solutions	Vishay General Semiconductor	IXYS	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	15 A	15 A	15 A	7.5 A (per Diode)	16 A	16 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 30 A	560 mV @ 15 A	700 mV @ 15 A	840 mV @ 7.5 A	670 mV @ 15 A	630 mV @ 16 A
Current - Reverse Leakage @ Vr	200 µA @ 45 V	1.75 mA @ 45 V	1 mA @ 45 V	100 µA @ 45 V	500 µA @ 45 V	200 µA @ 45 V
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)
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Operating Temperature - Junction (Max)	175°C	150°C	150°C	150°C	175°C	150°C
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Obsolete	Active	Obsolete	Active	Last Time Buy
Inventory Status	2400 Pcs	726 Pcs	1800 Pcs	7522 Pcs	856 Pcs	1765 Pcs

Engineering Selection Recommendations

Direct Equivalent - Recommended Primary Substitute:

MBRB1545 (SMC Diode Solutions) is the optimal direct equivalent for STPS1545G replacement. This part matches the 45 V / 15 A rating specification exactly, maintains identical D2PAK packaging, and is currently in active product status with 1800 units in stock. MBRB1545 is ROHS3 compliant and provides superior reverse leakage characteristics (1 mA vs. 200 µA at 45 V), indicating improved device quality. Operating temperature range of −55°C to 150°C is acceptable for most applications, though 25°C lower than the original part's maximum junction temperature of 175°C.

Alternative Direct Equivalent - Secondary Option:

12TQ045S (Vishay General Semiconductor) provides identical 45 V / 15 A ratings in D2PAK packaging with superior forward voltage characteristics (560 mV @ 15 A vs. 840 mV @ 30 A). However, this part is obsolete and RoHS non-compliant, limiting its suitability for new designs. Maximum junction temperature of 150°C matches MBRB1545.

Higher Current Alternatives - For Upgraded Designs:

DSS16-0045AS-TRL (IXYS) and MBRB1645-E3/45 (Vishay) both provide 16 A current ratings at 45 V, offering 6.7% current margin above the original specification. Both maintain D2PAK packaging compatibility. DSS16-0045AS-TRL is active status with ROHS3 compliance and maximum junction temperature of 175°C, matching the original part's thermal rating. MBRB1645-E3/45 is Last Time Buy status with ROHS3 compliance but limited to 150°C maximum junction temperature.

Not Recommended:

MBRB1545CT (Vishay) is a diode array configuration with 1 Pair Common Cathode topology and 7.5 A per diode rating, making it unsuitable as a direct substitute for single-diode applications requiring 15 A continuous current.

Frequently Asked Questions (FAQ)

Q: Can MBRB1545 be used as a direct replacement for STPS1545G in existing designs?

A: Yes. MBRB1545 matches the critical electrical specifications: 45 V reverse voltage, 15 A average rectified current, Schottky technology, and D2PAK surface mount packaging. The part is pin-compatible and electrically equivalent. The 25°C lower maximum junction temperature (150°C vs. 175°C) must be verified against circuit thermal requirements.

Q: What is the difference between MBRB1545 and MBRB1645-E3/45?

A: MBRB1645-E3/45 provides 16 A current rating versus 15 A for MBRB1545, offering additional current margin. Both share 45 V voltage rating and D2PAK packaging. MBRB1645-E3/45 is Last Time Buy status, while MBRB1545 is active. Forward voltage is lower for MBRB1645-E3/45 (630 mV @ 16 A vs. 700 mV @ 15 A), indicating improved efficiency.

Q: Why is MBRB1545CT not suitable as a substitute?

A: MBRB1545CT is a diode array with common cathode configuration containing two 7.5 A diodes, not a single 15 A diode. The internal topology and current rating per diode make it incompatible with applications designed for single-diode operation at 15 A continuous current.

Q: Are there RoHS compliance concerns with substitute parts?

A: MBRB1545, DSS16-0045AS-TRL, and MBRB1645-E3/45 are all ROHS3 compliant, meeting current environmental regulations. 12TQ045S is RoHS non-compliant and should be avoided for new designs subject to RoHS requirements.

Q: Does package compatibility extend beyond D2PAK?

A: All substitute parts listed use TO-263-3 D2PAK (2 Leads + Tab) or TO-263AB packaging variants, which are mechanically and electrically compatible. Pin assignments and thermal tab placement are identical across these variants, ensuring direct PCB compatibility.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current varies among substitutes from 100 µA (MBRB1545CT) to 1.75 mA (12TQ045S) at 45 V. Lower leakage indicates superior device quality and reduced standby power dissipation. MBRB1545 at 1 mA and MBRB1645-E3/45 at 200 µA provide acceptable leakage performance for most applications.

Q: Can DSS16-0045AS-TRL be used in place of STPS1545G?

A: Yes, with design verification. DSS16-0045AS-TRL provides 16 A current rating (6.7% above specification), matching 45 V voltage and D2PAK packaging. The part is active status, ROHS3 compliant, and maintains 175°C maximum junction temperature. Forward voltage is 670 mV @ 15 A, lower than the original part, improving efficiency.

Q: What inventory considerations apply to substitute selection?

A: MBRB1545 has 1800 units in stock (active status), providing reliable long-term availability. MBRB1645-E3/45 has 1765 units but is Last Time Buy status, limiting future procurement. DSS16-0045AS-TRL has 856 units in active status. 12TQ045S (726 units) and MBRB1545CT (7522 units) are obsolete, suitable only for immediate replacement needs.

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