STPS1545DY Equivalent & Substitute Parts

Part Overview

The STPS1545DY is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 45 V DC reverse voltage and 15 A average rectified current in a TO-220AC through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 15 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200 µA @ 45 V	µA
Technology	Schottky	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-40°C ~ 175°C	°C
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the STPS1545DY are selected based on the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io): 15 A minimum
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: TO-220-2
Supplier Device Package: TO-220AC

Compliance Considerations:

RoHS Status: ROHS3 Compliant preferred
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into three categories based on manufacturer recommendation status and product lifecycle stage:

MFR Recommended Substitute: STPS1645GY-TR (STMicroelectronics) — Active product with manufacturer endorsement
Direct Substitute: MBR1545 (SMC Diode Solutions) — Functionally equivalent, active product
Similar Substitute: 12TQ045 (Vishay General Semiconductor - Diodes Division) — Functionally equivalent, obsolete product

Parameter Comparison

Parameter	STPS1545DY	STPS1645GY-TR	MBR1545	12TQ045
Manufacturer	STMicroelectronics	STMicroelectronics	SMC Diode Solutions	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active	Active	Obsolete
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	15 A	—	—	15 A
Voltage - Forward (Vf) (Max) @ If	570 mV @ 15 A	—	700 mV @ 15 A	560 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	200 µA @ 45 V	—	1 mA @ 45 V	1.75 mA @ 45 V
Technology	Schottky	Schottky	Schottky	Schottky
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Supplier Device Package	TO-220AC	TO-220AC	TO-220AC	TO-220AC
Operating Temperature - Junction	-40°C ~ 175°C	—	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
REACH Status	REACH Unaffected	—	REACH Affected	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

STPS1645GY-TR (Recommended Primary Substitute)

The STPS1645GY-TR is the manufacturer-recommended substitute from STMicroelectronics. This part maintains active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status align with current regulatory requirements. Selection of this part is appropriate for new designs and production transitions from the obsolete STPS1545DY.

MBR1545 (Active Alternative)

The MBR1545 from SMC Diode Solutions is an active product offering functional equivalence across critical electrical parameters. This part maintains 45 V reverse voltage rating, fast recovery speed characteristics, and TO-220AC packaging. Forward voltage specification of 700 mV at 15 A represents a 130 mV increase relative to the STPS1545DY. Reverse leakage current of 1 mA at 45 V is elevated compared to the original specification. ROHS3 compliance is maintained; however, REACH status is affected. This part is suitable for applications where the elevated forward voltage and reverse leakage parameters are acceptable within circuit design margins.

12TQ045 (Obsolete Alternative)

The 12TQ045 from Vishay General Semiconductor - Diodes Division is classified as obsolete, limiting its suitability for new production. RoHS non-compliance status presents regulatory constraints for applications subject to RoHS directives. Forward voltage specification of 560 mV at 15 A is favorable relative to the original part. Reverse leakage current of 1.75 mA at 45 V exceeds original specifications. This part is applicable only for legacy system maintenance where existing inventory is available and regulatory exemptions are established.

Frequently Asked Questions (FAQ)

Q: Can the STPS1645GY-TR directly replace the STPS1545DY in existing designs?

A: The STPS1645GY-TR maintains electrical and mechanical compatibility with the STPS1545DY across all critical parameters: 45 V reverse voltage rating, 15 A average rectified current, fast recovery speed, and TO-220AC packaging. Direct substitution is supported without circuit modification.

Q: What is the significance of the forward voltage difference between STPS1545DY (570 mV) and MBR1545 (700 mV)?

A: The 130 mV increase in forward voltage drop at 15 A results in higher power dissipation in the MBR1545. Circuit thermal analysis must confirm that heat dissipation capacity remains adequate. Applications with tight thermal budgets may require heatsink adjustment or thermal management review.

Q: Why is the 12TQ045 listed as a substitute if it is obsolete?

A: The 12TQ045 is included for reference in legacy system maintenance scenarios where existing inventory is available. Obsolete status indicates that new procurement is not recommended. For new designs and ongoing production, active alternatives (STPS1645GY-TR or MBR1545) are preferred.

Q: What does RoHS non-compliance mean for the 12TQ045?

A: RoHS non-compliance indicates that the 12TQ045 does not meet Restriction of Hazardous Substances directives. Use of this part is restricted in applications subject to RoHS regulations, including consumer electronics and many industrial applications in regulated markets. Verification of regulatory applicability is required before selection.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are specified in TO-220-2 package / case with TO-220AC supplier device package designation, ensuring mechanical and thermal interface compatibility with the original STPS1545DY.

Q: What is the impact of reverse leakage current differences on circuit performance?

A: The STPS1545DY specifies 200 µA reverse leakage at 45 V, while MBR1545 and 12TQ045 specify 1 mA and 1.75 mA respectively. Higher reverse leakage increases standby current consumption and may affect precision analog circuits. Circuit design must account for these leakage specifications in power budget and signal integrity analysis.

Q: Is the STPS1645GY-TR suitable for automotive applications?

A: The STPS1545DY carries automotive grade classification with AEC-Q101 qualification. Automotive suitability of the STPS1645GY-TR must be confirmed through manufacturer documentation and qualification status verification, as this information is not provided in the available specifications.

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