MBRB2545CTG Equivalent & Substitute Parts

Part Overview

The MBRB2545CTG is a Schottky diode array manufactured by onsemi, configured as 1 pair common cathode with 45V reverse voltage rating and 15A average rectified current per diode. The device is packaged in TO-263-3 (D2PAK) surface mount format and belongs to the SWITCHMODE™ series. This part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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)	15	A
Voltage - Forward (Vf) (Max) @ If	820 mV @ 30 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 45 V
Operating Temperature - Junction	-65°C ~ 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 MBRB2545CTG is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Diode Configuration: 1 Pair Common Cathode (mandatory match)
Technology: Schottky (mandatory match)
Voltage - DC Reverse (Vr) (Max): 45 V (mandatory match)
Current - Average Rectified (Io) (per Diode): 15 A (mandatory match or higher)
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (mandatory match)

Allowable Variations:

Voltage - Forward (Vf) (Max) @ If: May vary within acceptable operating margins
Current - Reverse Leakage @ Vr: May vary within acceptable operating margins
Operating Temperature - Junction: May vary; lower minimum or maximum limits are acceptable
Product Status: Active parts are preferred over obsolete parts
Packaging Format: Tape & Reel (TR), Cut Tape (CT), or Tube formats are interchangeable for the same electrical device

Substitute parts are grouped into two categories: Similar Manufacturer Parts (direct electrical and mechanical equivalents) and Parametric Equivalents (identical electrical specifications with packaging format variations).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj (Max) [°C]	Status	Packaging
MBRB2545CTG	onsemi	45	15	820 @ 30 A	200 @ 45 V	175	Obsolete	D2PAK
DSA30C45PC-TRL	IXYS	45	15	750 @ 15 A	250 @ 45 V	175	Active	TO-263AA
DSSK28-0045BS-TRL	IXYS	45	15	480 @ 15 A	20 mA @ 45 V	150	Active	TO-263AA
STPS2545CGY-TR	STMicroelectronics	45	12.5	840 @ 25 A	125 @ 45 V	175	Active	D2PAK
STPS3045CG-TR	STMicroelectronics	45	15	570 @ 15 A	200 @ 45 V	200	Active	D2PAK
STPS3045CGY-TR	STMicroelectronics	45	15	570 @ 15 A	200 @ 45 V	200	Active	D2PAK
STPS30L45CG-TR	STMicroelectronics	45	15	550 @ 15 A	400 @ 45 V	150	Active	D2PAK
VBT2045C-E3/8W	Vishay	45	10	580 @ 10 A	2 mA @ 45 V	150	Active	TO-263AB
VS-MBRB2545CT-M3	Vishay	45	15	820 @ 30 A	200 @ 45 V	150	Active	TO-263AB
VS-MBRB2545CTL-M3	Vishay	45	15	820 @ 30 A	200 @ 45 V	150	Active	TO-263AB
VS-MBRB2545CTR-M3	Vishay	45	15	820 @ 30 A	200 @ 45 V	150	Active	TO-263AB

Engineering Selection Recommendations

Full Electrical and Mechanical Equivalents (Highest Priority):

The following parts provide complete substitution for MBRB2545CTG with identical or superior electrical specifications and active product status:

STPS3045CG-TR and STPS3045CGY-TR (STMicroelectronics): Both deliver 15A at 45V with improved forward voltage (570 mV @ 15 A vs. 820 mV @ 30 A). STPS3045CGY-TR includes AEC-Q101 automotive qualification. Maximum junction temperature extends to 200°C. Both are in active production with high inventory availability (2,870 and 19,257 units respectively).
VS-MBRB2545CT-M3, VS-MBRB2545CTL-M3, and VS-MBRB2545CTR-M3 (Vishay): These parts maintain identical electrical characteristics to MBRB2545CTG (820 mV @ 30 A forward voltage, 200 µA reverse leakage). All three are active products with packaging in Tube or Tape & Reel formats. Inventory ranges from 748 to 986 units.

Qualified Substitutes with Current Derating:

STPS2545CGY-TR (STMicroelectronics): Rated for 12.5A (vs. 15A requirement). Includes AEC-Q101 automotive qualification and operates to 175°C maximum junction temperature. Use only in applications where 12.5A average rectified current is acceptable.

Substitutes with Current Rating Match but Parameter Variations:

DSA30C45PC-TRL (IXYS): Maintains 15A rating at 45V with improved forward voltage (750 mV @ 15 A). Reverse leakage is slightly higher (250 µA vs. 200 µA). Active product status with 922 units in stock.
DSSK28-0045BS-TRL (IXYS): Delivers 15A at 45V with significantly lower forward voltage (480 mV @ 15 A). Reverse leakage increases to 20 mA, and maximum junction temperature is limited to 150°C. Active product with 987 units available.

Limited Substitution (Current Derating Required):

VBT2045C-E3/8W (Vishay TMBS® series): Rated for 10A only (vs. 15A requirement). Suitable only for applications with reduced current demands. Active product with 950 units in stock.

Compliance and Certification Status:

All substitute parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the original MBRB2545CTG specifications. Parts with AEC-Q101 automotive qualification (STPS3045CGY-TR and STPS2545CGY-TR) are suitable for automotive applications requiring this certification.

Frequently Asked Questions (FAQ)

Q1: Can STPS3045CG-TR or STPS3045CGY-TR directly replace MBRB2545CTG without circuit modification?

A: Yes. Both parts are electrically and mechanically equivalent with identical 45V reverse voltage, 15A average rectified current, and TO-263-3 D2PAK packaging. The improved forward voltage (570 mV @ 15 A vs. 820 mV @ 30 A) reduces power dissipation, which is beneficial. No circuit modification is required.

Q2: What is the difference between STPS3045CG-TR and STPS3045CGY-TR?

A: Both parts have identical electrical specifications. STPS3045CGY-TR includes AEC-Q101 automotive qualification and is graded for automotive applications. STPS3045CG-TR is the industrial-grade equivalent. Select based on application requirements.

Q3: Why do the Vishay parts (VS-MBRB2545CT-M3, VS-MBRB2545CTL-M3, VS-MBRB2545CTR-M3) show different maximum junction temperatures (150°C vs. 175°C)?

A: The Vishay parts are rated to 150°C maximum junction temperature, compared to 175°C for the original MBRB2545CTG. This is a conservative rating and does not affect substitution in most applications. Verify thermal design margins if operating near maximum junction temperature limits.

Q4: Can STPS2545CGY-TR be used as a substitute if the application requires 15A?

A: STPS2545CGY-TR is rated for 12.5A average rectified current, not 15A. It is not a direct substitute for 15A applications. Use only if the actual circuit current demand is 12.5A or lower. The part includes AEC-Q101 automotive qualification if that certification is required.

Q5: What is the significance of the forward voltage difference between MBRB2545CTG (820 mV @ 30 A) and STPS3045CG-TR (570 mV @ 15 A)?

A: The forward voltage is measured at different current levels. STPS3045CG-TR's lower forward voltage (570 mV @ 15 A) indicates superior efficiency at the rated 15A current. This reduces power dissipation and heat generation, which is advantageous. The measurement conditions differ, but the STPS3045CG-TR will dissipate less power in typical operation.

Q6: Are the TO-263-3, D2PAK, and TO-263AB package designations interchangeable?

A: Yes. These designations refer to the same physical package format: a 3-lead surface mount package with 2 leads and a tab. All substitute parts listed use this identical package, ensuring PCB footprint compatibility without modification.

Q7: Which substitute part has the best availability?

A: STPS3045CGY-TR has the highest inventory with 19,257 units in stock, followed by STPS2545CGY-TR with 3,100 units. Both are in active production with reliable long-term availability.

Q8: Is reverse leakage current a critical parameter for substitution?

A: Reverse leakage varies among substitutes (200 µA to 20 mA @ 45 V). For most applications, this variation is acceptable. However, in high-impedance circuits or precision analog applications, verify that the substitute's reverse leakage does not exceed circuit requirements. DSSK28-0045BS-TRL has significantly higher leakage (20 mA) and should be evaluated carefully in sensitive applications.

Q9: Can I use VBT2045C-E3/8W if my circuit only draws 10A?

A: Yes. VBT2045C-E3/8W is suitable for applications with 10A or lower average rectified current. It maintains the 45V reverse voltage rating and TO-263-3 package compatibility. The 10A current rating is the limiting factor; do not exceed this specification.

Q10: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging formats?

A: Both formats contain the same electrical device. Cut Tape (CT) is supplied in smaller quantities on tape without reel, suitable for manual handling or small production runs. Tape & Reel (TR) is supplied on a reel for automated pick-and-place assembly. The electrical specifications are identical; packaging format selection depends on assembly process requirements.

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