STPS1045B Equivalent & Substitute Parts

Part Overview

The STPS1045B is a Schottky rectifier diode rated for 45 V DC reverse voltage and 10 A average rectified current in a surface mount TO-252-3 DPAK package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the 45 V, 10 A Schottky diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	630 mV @ 10 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200 µA @ 45 V	µA
Capacitance @ Vr, F	760pF @ 5V, 1MHz	pF
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Operating Temperature - Junction	-40°C ~ 175°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the STPS1045B is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io): 10 A
Mounting Type: Surface Mount
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: ±70 mV tolerance
Current - Reverse Leakage @ Vr: ≤ 1 mA @ 45 V
Capacitance @ Vr, F: Variation acceptable when not specified
Operating Temperature - Junction: Minimum -40°C, Maximum ≥ 150°C
Technology: Schottky or Super Barrier (functionally equivalent)
Speed: Fast Recovery (≤ 500ns) or Standard Recovery (> 500ns)

Parts are grouped into three categories: parametric equivalents (identical electrical specifications), direct manufacturers (alternative sources with minor parameter variations), and manufacturer-recommended substitutes (active alternatives with acceptable deviations).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	Ir @ Vr [µA]	Package	Product Status	RoHS Status
STPS1045B	Vishay General Semiconductor - Diodes Division	45	10	630 @ 10 A	Fast Recovery ≤ 500ns	200 @ 45 V	TO-252-3 DPAK	Obsolete	RoHS Non-Compliant
VS-10WQ045FNHM3	Vishay General Semiconductor - Diodes Division	45	10	630 @ 10 A	Fast Recovery ≤ 500ns	1000 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
VS-STPS1045B-M3	Vishay General Semiconductor - Diodes Division	45	10	630 @ 10 A	Fast Recovery ≤ 500ns	200 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
MBRD1045	SMC Diode Solutions	45	10	700 @ 10 A	Fast Recovery ≤ 500ns	1000 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
SBR1045D1-13	Diodes Incorporated	45	10	580 @ 10 A	Fast Recovery ≤ 500ns	500 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
SBR1045D1Q-13	Diodes Incorporated	45	10	580 @ 10 A	Standard Recovery > 500ns	500 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
SBR10U45D1-13	Diodes Incorporated	45	10	570 @ 10 A	Standard Recovery > 500ns	500 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
STPS1045B	STMicroelectronics	45	10	630 @ 10 A	Fast Recovery ≤ 500ns	100 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant
STPS1045B-TR	STMicroelectronics	45	10	630 @ 10 A	Fast Recovery ≤ 500ns	100 @ 45 V	TO-252-3 DPAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Preferred for Direct Replacement):

VS-STPS1045B-M3 and STPS1045B (STMicroelectronics) are parametric equivalents to the obsolete STPS1045B (Vishay). Both maintain identical electrical specifications including 630 mV forward voltage drop at 10 A and 200 µA reverse leakage current at 45 V. Both are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1). VS-STPS1045B-M3 is supplied in tube packaging with 30,200 units in stock. STPS1045B from STMicroelectronics is available in tube packaging (1,228 units) and cut tape with digi-reel (STPS1045B-TR, 5,405 units).

Automotive-Qualified Alternatives:

VS-10WQ045FNHM3 carries AEC-Q101 automotive qualification and is ROHS3 compliant. It matches all critical parameters (45 V, 10 A, 630 mV Vf) with fast recovery speed. Reverse leakage is 1 mA at 45 V, within acceptable tolerance. Inventory availability is 33,138 units.

Super Barrier Technology Substitutes:

SBR1045D1-13, SBR1045D1Q-13, and SBR10U45D1-13 from Diodes Incorporated employ Super Barrier technology and are ROHS3 compliant. These parts meet the 45 V, 10 A core requirements with forward voltage drops ranging from 570 to 580 mV at 10 A, representing a 50 to 60 mV improvement over the original specification. SBR1045D1Q-13 carries AEC-Q101 automotive qualification. All three are active products with substantial inventory availability (5,100 to 30,200 units).

Alternative Manufacturer Option:

MBRD1045 from SMC Diode Solutions is ROHS3 compliant and rated for 45 V, 10 A in TO-252-3 DPAK. Forward voltage is 700 mV at 10 A (70 mV higher than original), and reverse leakage is 1 mA at 45 V. Operating temperature range is -55°C to 150°C. Inventory is 3,300 units.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant, addressing environmental regulatory requirements. The original STPS1045B from Vishay is RoHS non-compliant. REACH status is unaffected for all parts except MBRD1045 (REACH Affected). All parts carry ECCN EAR99 classification and HTSUS code 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can VS-STPS1045B-M3 directly replace the obsolete STPS1045B from Vishay?

A: Yes. VS-STPS1045B-M3 is a parametric equivalent with identical voltage rating (45 V), current rating (10 A), forward voltage drop (630 mV @ 10 A), and package (TO-252-3 DPAK). Both are Schottky technology with fast recovery speed. The primary difference is product status: VS-STPS1045B-M3 is active and ROHS3 compliant.

Q: What is the difference between the Schottky diodes and Super Barrier diodes in the substitute list?

A: Both are rectifier diode technologies suitable for the 45 V, 10 A application. Schottky diodes (STPS series, VS series) and Super Barrier diodes (SBR series) meet the same voltage and current specifications. Super Barrier diodes typically exhibit lower forward voltage drops (570–580 mV versus 630 mV), resulting in reduced power dissipation. Recovery speed characteristics may differ; verify application requirements for switching frequency sensitivity.

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

A: All substitute parts listed are available in TO-252-3 DPAK surface mount package. Packaging format (tube, tape & reel, cut tape) varies by manufacturer and part number. Verify packaging requirements for your procurement and assembly process.

Q: Which substitute part has the lowest forward voltage drop?

A: SBR10U45D1-13 has the lowest specified forward voltage drop at 570 mV @ 10 A, followed by SBR1045D1-13 and SBR1045D1Q-13 at 580 mV @ 10 A. The original STPS1045B and its equivalents specify 630 mV @ 10 A. Lower forward voltage reduces power dissipation in high-current applications.

Q: Is automotive qualification required for my application?

A: Automotive qualification (AEC-Q101) is specified for VS-10WQ045FNHM3 and SBR1045D1Q-13. If your application requires automotive-grade components, these parts are qualified. Non-automotive applications may use any of the listed active substitutes.

Q: What is the operating temperature range for each substitute?

A: Most substitutes operate from -40°C to 175°C junction temperature, matching the original STPS1045B. MBRD1045, SBR1045D1-13, SBR1045D1Q-13, and SBR10U45D1-13 operate from -55°C to 150°C, providing lower minimum temperature but lower maximum temperature. Verify your application's thermal requirements.

Q: Are there any reverse leakage current differences I should consider?

A: The original STPS1045B specifies 200 µA reverse leakage at 45 V. Substitutes range from 100 µA (STMicroelectronics STPS1045B) to 1 mA (VS-10WQ045FNHM3, MBRD1045, SBR series). Higher leakage increases standby power consumption. For low-power or standby-sensitive applications, select parts with lower leakage specifications.

Q: Can MBRD1045CT (diode array) replace the single diode STPS1045B?

A: No. MBRD1045CT is a diode array with 1 pair common cathode configuration, not a single diode. It is not a functional replacement for single-diode applications. Use only single-diode parts from the substitute list.

Q: What is the moisture sensitivity level (MSL) for all parts?

A: All listed parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or assembly processes.

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