MBR3045CTHE3/45 Equivalent & Substitute Parts

Part Overview

The MBR3045CTHE3/45 is a Schottky diode array with 1 pair common cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in TO-220-3 through-hole format and qualified to AEC-Q101 automotive standards.

The MBR3045CTHE3/45 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute components must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating different packaging and mounting technologies.

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	600 mV @ 20 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1	mA @ 45 V
Operating Temperature - Junction	-65 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MBR3045CTHE3/45 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Current - Average Rectified (Io) (per Diode): Must equal or exceed 15 A
Diode Configuration: Must be 1 Pair Common Cathode
Technology: Must be Schottky
Speed: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Thermal & Environmental Requirements:

Operating Temperature - Junction: Must support minimum -65°C to 150°C range
Grade: Automotive qualification preferred
Qualification: AEC-Q101 preferred

Packaging & Mounting:

Mounting Type: Through Hole (primary substitutes) or Surface Mount (alternative technology)
Package / Case: TO-220-3 (primary) or TO-263-3 (surface mount alternative)

Compliance:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Substitute parts are grouped into two categories: Direct Through-Hole Substitutes (identical mounting technology) and Surface Mount Alternative (different mounting technology requiring PCB redesign).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) [mV]	Ir @ Vr [µA/mA]	Tj (Max) [°C]	Mounting Type	Package	Product Status	AEC-Q101
MBR3045CTHE3/45	Vishay	45	15	600 @ 20A	1 mA	150	Through Hole	TO-220-3	Obsolete	Yes
STPS30L45CT	STMicroelectronics	45	15	550 @ 15A	400 µA	150	Through Hole	TO-220-3	Active	Yes
STPS3045CT	STMicroelectronics	45	15	570 @ 15A	200 µA	200	Through Hole	TO-220-3	Active	Yes
MBR2545CTG	onsemi	45	15	620 @ 15A	200 µA	175	Through Hole	TO-220-3	Active	No
MBR3045CT-BP	Micro Commercial Co	45	15	700 @ 15A	200 µA	150	Through Hole	TO-220-3	Active	No
MBRP1545NTU	Fairchild Semiconductor	45	15	800 @ 15A	1 mA	150	Through Hole	TO-220-3	Active	No
MBRP3045NTU	Fairchild Semiconductor	45	15	650 @ 15A	1 mA	150	Through Hole	TO-220-3	Active	No
STPS1545CT	STMicroelectronics	45	7.5	570 @ 7.5A	100 µA	175	Through Hole	TO-220-3	Active	Yes
STPS2545CT	STMicroelectronics	45	12.5	570 @ 12.5A	125 µA	175	Through Hole	TO-220-3	Active	Yes
V30D45CHM3_A/I	Vishay	45	15	570 @ 15A	1.5 mA	150	Surface Mount	TO-263-3	Active	Yes

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - Through Hole TO-220-3):

The following parts provide direct electrical and mechanical compatibility with the MBR3045CTHE3/45:

STPS30L45CT (STMicroelectronics): Active product status with AEC-Q101 qualification. Lowest forward voltage (550 mV @ 15 A) and identical thermal rating (150°C max junction temperature). Suitable for applications requiring optimized power dissipation.
STPS3045CT (STMicroelectronics): Active product status with AEC-Q101 qualification. Forward voltage of 570 mV @ 15 A with extended maximum junction temperature (200°C). Highest inventory availability (38,369 pcs). Recommended for general-purpose replacement.
MBR2545CTG (onsemi): Active product status. Forward voltage of 620 mV @ 15 A with extended maximum junction temperature (175°C). SWITCHMODE™ series designation. No AEC-Q101 qualification.
MBR3045CT-BP (Micro Commercial Co): Active product status. Forward voltage of 700 mV @ 15 A. No AEC-Q101 qualification.
MBRP3045NTU (Fairchild Semiconductor): Active product status. Forward voltage of 650 mV @ 15 A with matching reverse leakage (1 mA @ 45 V). No AEC-Q101 qualification.
MBRP1545NTU (Fairchild Semiconductor): Active product status. Forward voltage of 800 mV @ 15 A with matching reverse leakage (1 mA @ 45 V). No AEC-Q101 qualification.

Current-Reduced Substitutes (Through Hole TO-220-3):

These parts maintain 45 V reverse voltage rating but provide reduced current ratings:

STPS2545CT (STMicroelectronics): 12.5 A per diode (83% of original rating). Active product status with AEC-Q101 qualification. Forward voltage of 570 mV @ 12.5 A. Suitable only for applications with reduced current requirements.
STPS1545CT (STMicroelectronics): 7.5 A per diode (50% of original rating). Active product status with AEC-Q101 qualification. Forward voltage of 570 mV @ 7.5 A. Suitable only for applications with significantly reduced current requirements.

Surface Mount Alternative (Different Mounting Technology):

V30D45CHM3_A/I (Vishay): Active product status with AEC-Q101 qualification. Identical electrical specifications (45 V, 15 A) with forward voltage of 570 mV @ 15 A. Surface mount TO-263-3 (D2PAK) package. Requires PCB redesign and different assembly process. Recommended only when surface mount technology is required.

Compliance Considerations:

For automotive applications requiring AEC-Q101 qualification, select from: STPS30L45CT, STPS3045CT, STPS2545CT, STPS1545CT, or V30D45CHM3_A/I.

For non-automotive applications, all listed substitutes are acceptable based on electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can STPS1545CT or STPS2545CT be used as direct replacements for MBR3045CTHE3/45?

A: No. STPS1545CT provides 7.5 A per diode and STPS2545CT provides 12.5 A per diode, both below the 15 A requirement of the original part. These substitutes are suitable only for applications with reduced current requirements. Use STPS3045CT or STPS30L45CT for full 15 A current rating.

Q: What is the difference between STPS30L45CT and STPS3045CT?

A: Both parts provide identical electrical ratings (45 V, 15 A, Schottky, TO-220-3). STPS30L45CT has lower forward voltage (550 mV @ 15 A) and lower maximum junction temperature (150°C). STPS3045CT has forward voltage of 570 mV @ 15 A and higher maximum junction temperature (200°C). STPS3045CT is recommended for general replacement due to higher thermal rating and greater inventory availability.

Q: Can V30D45CHM3_A/I be used as a direct replacement?

A: V30D45CHM3_A/I provides identical electrical specifications (45 V, 15 A, Schottky) but uses surface mount TO-263-3 packaging instead of through-hole TO-220-3. Direct PCB-level substitution is not possible without redesign. This part is suitable only when surface mount technology is required or when PCB redesign is acceptable.

Q: Which substitute parts have AEC-Q101 automotive qualification?

A: STPS30L45CT, STPS3045CT, STPS2545CT, STPS1545CT, and V30D45CHM3_A/I all carry AEC-Q101 qualification. For automotive applications, these parts are preferred over MBR2545CTG, MBR3045CT-BP, MBRP1545NTU, and MBRP3045NTU.

Q: What is the impact of forward voltage differences between substitutes?

A: Forward voltage differences directly affect power dissipation and thermal performance. Lower forward voltage (STPS30L45CT at 550 mV) reduces power loss compared to higher forward voltage (MBRP1545NTU at 800 mV). For applications with tight thermal budgets or high current operation, select substitutes with lower forward voltage specifications.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original MBR3045CTHE3/45.

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

A: Reverse leakage current affects standby power consumption and thermal performance at rated reverse voltage. The original part specifies 1 mA @ 45 V. Substitutes range from 100 µA to 1.5 mA. Lower reverse leakage (STPS1545CT at 100 µA) reduces standby power dissipation. Higher reverse leakage (V30D45CHM3_A/I at 1.5 mA) has minimal impact in most applications but should be considered in low-power standby scenarios.

Q: Can MBR2545CTG be used in automotive applications?

A: MBR2545CTG is active and provides correct electrical specifications (45 V, 15 A, TO-220-3) but lacks AEC-Q101 qualification. Use only in non-automotive applications or where automotive qualification is not required. For automotive applications, select STPS30L45CT, STPS3045CT, or other AEC-Q101 qualified alternatives.

Q: What is the maximum junction temperature consideration for thermal design?

A: The original part specifies -65°C to 150°C junction temperature range. Substitutes range from 150°C to 200°C maximum. Parts with higher maximum junction temperature (STPS3045CT at 200°C) provide greater thermal margin in high-temperature environments. For applications operating near thermal limits, select substitutes with higher maximum junction temperature ratings.

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