Equivalent & Substitute Parts for 30CTQ045-1

Part Overview

The 30CTQ045-1 is a Schottky diode array manufactured by Vishay General Semiconductor - Diodes Division. This component features a 1 Pair Common Cathode configuration rated for 45 V DC reverse voltage and 15 A average rectified current per diode. The device is packaged in TO-262-3 (I2PAK) with long leads for through-hole mounting.

The 30CTQ045-1 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array.

Key Parameters

Parameter	Value
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	620 mV @ 15 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the 30CTQ045-1 are categorized based on electrical and mechanical compatibility within the following parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Common Cathode
Technology: Schottky
Voltage - DC Reverse (Vr) (Max): 45 V minimum
Current - Average Rectified (Io) (per Diode): 15 A minimum
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Mounting Type: Through Hole
Operating Temperature Range: Must support application requirements

Substitution Categories:

Parametric Equivalents (Same Package): Parts maintaining identical electrical ratings and TO-262-3 packaging allow direct replacement without circuit board modifications.

Manufacturer Recommended Substitutes (Different Package): Parts with equivalent or superior electrical ratings but different through-hole packages (TO-220-3) require PCB layout evaluation but maintain electrical compatibility.

Parameter Comparison

Parameter	30CTQ045-1 (Vishay)	30CTQ045-1 (SMC)	MBRB3045CT-1G (onsemi)	MBR20L45CTG (onsemi)	MBR2550CT (Diodes Inc.)	STPS40L45CT (STMicroelectronics)
Manufacturer	Vishay	SMC Diode Solutions	onsemi	onsemi	Diodes Incorporated	STMicroelectronics
Diode Configuration	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode	1 Pair Common Cathode
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	50 V	45 V
Current - Average Rectified (Io) (per Diode)	15 A	15 A	15 A	10 A	15 A	20 A
Voltage - Forward (Vf) (Max) @ If	620 mV @ 15 A	620 mV @ 15 A	620 mV @ 15 A	500 mV @ 10 A	750 mV @ 15 A	530 mV @ 20 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 45 V	1 mA @ 45 V	200 µA @ 45 V	500 µA @ 45 V	1 mA @ 50 V	600 µA @ 45 V
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C	150°C (Max)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-262-3 Long Leads, I2PAK, TO-262AA	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Obsolete	Obsolete	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Same Package - TO-262-3):

The 30CTQ045-1 manufactured by SMC Diode Solutions is a parametric equivalent offering identical electrical specifications and package configuration. This part is currently in active product status and ROHS3 compliant, providing a direct substitution path for the obsolete Vishay component without requiring PCB layout modifications.

The MBRB3045CT-1G from onsemi maintains the same TO-262-3 package and electrical ratings. Although classified as obsolete, this part demonstrates superior reverse leakage characteristics (200 µA @ 45 V versus 2 mA @ 45 V) and an extended operating temperature range (-65°C ~ 175°C). ROHS3 compliance supports modern manufacturing requirements.

Alternative Substitutes (Different Package - TO-220-3):

The STPS40L45CT from STMicroelectronics is an active product offering superior current rating (20 A versus 15 A) at the same 45 V reverse voltage. This part provides design margin for current-limited applications and is ROHS3 compliant. PCB layout modification is required due to TO-220-3 packaging.

The MBR20L45CTG from onsemi provides 45 V reverse voltage with 10 A current rating. This part is suitable for applications with reduced current requirements and offers lower forward voltage (500 mV @ 10 A). ROHS3 compliance is provided.

The MBR2550CT from Diodes Incorporated offers 50 V reverse voltage with 15 A current rating, providing voltage margin for applications approaching the 45 V limit. TO-220-3 packaging requires PCB evaluation. ROHS3 compliance is provided.

Compliance Considerations:

The original 30CTQ045-1 from Vishay is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting compliance requirements for new designs and manufacturing processes. REACH status varies by manufacturer; verification against specific application requirements is necessary.

Frequently Asked Questions (FAQ)

Q: Can the SMC Diode Solutions 30CTQ045-1 directly replace the Vishay 30CTQ045-1?

A: Yes. The SMC part maintains identical electrical specifications (45 V, 15 A, 620 mV forward voltage) and TO-262-3 packaging. No circuit modifications are required. The SMC part is currently active and ROHS3 compliant, addressing obsolescence and compliance concerns.

Q: What is the primary difference between TO-262-3 and TO-220-3 packages?

A: Both are through-hole packages with different physical dimensions and lead configurations. TO-262-3 (I2PAK) features long leads and a narrower profile suitable for specific PCB layouts. TO-220-3 is a larger, more common package. Substitution between these packages requires PCB layout evaluation to confirm lead spacing and thermal management compatibility.

Q: Can I use the STPS40L45CT (20 A) instead of the 30CTQ045-1 (15 A)?

A: Yes, from an electrical standpoint. The STPS40L45CT maintains 45 V reverse voltage and provides 20 A current capacity, exceeding the 15 A requirement. This substitution provides design margin for current-limited applications. However, the TO-220-3 package differs from TO-262-3, requiring PCB layout verification.

Q: Why does the MBR20L45CTG have a lower current rating (10 A) than the original part (15 A)?

A: The MBR20L45CTG is suitable only for applications requiring 10 A or less. For applications requiring the full 15 A rating, this part is not appropriate. Use parts maintaining 15 A or higher current ratings: SMC 30CTQ045-1, MBRB3045CT-1G, MBR2550CT, or STPS40L45CT.

Q: What does "1 Pair Common Cathode" configuration mean?

A: This diode array contains two independent Schottky diodes sharing a common cathode connection. The configuration is essential for specific circuit topologies. All substitute parts maintain this configuration, ensuring functional compatibility.

Q: Are there differences in reverse leakage current between substitute parts?

A: Yes. Reverse leakage varies: Vishay 30CTQ045-1 (2 mA @ 45 V), SMC 30CTQ045-1 (1 mA @ 45 V), MBRB3045CT-1G (200 µA @ 45 V), MBR20L45CTG (500 µA @ 45 V), MBR2550CT (1 mA @ 50 V), and STPS40L45CT (600 µA @ 45 V). Lower leakage current may benefit high-impedance or precision applications. Verify leakage requirements for your specific circuit.

Q: Which substitute parts are currently in active production status?

A: The SMC Diode Solutions 30CTQ045-1 and STMicroelectronics STPS40L45CT are classified as active products. These parts offer the best long-term supply chain availability and support for ongoing production requirements.

Q: Do all substitute parts meet RoHS compliance?

A: All recommended substitute parts are ROHS3 compliant. The original Vishay 30CTQ045-1 is RoHS non-compliant. Substitution with compliant alternatives supports modern manufacturing and environmental requirements.

Q: What is the operating temperature range difference between parts?

A: The original Vishay part and SMC equivalent support -55°C ~ 175°C. The MBRB3045CT-1G extends the lower limit to -65°C. The MBR20L45CTG and MBR2550CT limit the upper range to 150°C. The STPS40L45CT specifies 150°C maximum. Verify temperature requirements for your application environment.

Q: Can I use the MBR2550CT (50 V) in place of the 30CTQ045-1 (45 V)?

A: Yes. The MBR2550CT provides 50 V reverse voltage, exceeding the 45 V requirement. This substitution provides voltage margin for applications operating near the 45 V limit. The part maintains 15 A current rating and fast recovery characteristics. TO-220-3 packaging requires PCB layout evaluation.

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