30CTQ045-1 Equivalent & Substitute Parts

Part Overview

The 30CTQ045-1 is a Schottky diode array manufactured by SMC Diode Solutions, configured as a 1 Pair Common Cathode rectifier with a maximum reverse voltage rating of 45 V and average rectified current of 15 A per diode. The device is packaged in a TO-262-3 Long Leads (I2PAK) through-hole configuration and is currently in Active product status.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit selection from alternative manufacturers offering equivalent electrical and mechanical specifications. The substitute identified for this application maintains identical core electrical parameters and package compatibility.

Substiute Parts

30CTQ045-1

SMC Diode SolutionsIn Stock: 107930CTQ045-1 Datasheet

Current PartRFQ

MBRB3045CT-1G

onsemiIn Stock: 1965MBRB3045CT-1G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 30CTQ045-1 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 45 V
• Current - Average Rectified (Io) (per Diode): 15 A
• Voltage - Forward (Vf) (Max) @ If: 620 mV @ 15 A
• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Mechanical Parameters (Must Match):

• Package / Case: TO-262-3 Long Leads, I2PAK, TO-262AA
• Mounting Type: Through Hole

Compliance Parameters (Must Match):

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

The MBRB3045CT-1G from onsemi satisfies all substitution criteria and is therefore classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (30CTQ045-1): The 30CTQ045-1 maintains Active product status with 987 units in current inventory. This part is the preferred selection for new designs and ongoing production due to manufacturer support and availability.

Substitute Part (MBRB3045CT-1G): The MBRB3045CT-1G is classified as Obsolete by onsemi. While it meets all electrical and mechanical equivalence criteria, its obsolete status indicates discontinued manufacturing and limited future availability. This part is suitable only for legacy system maintenance or when supply of the primary part is unavailable. The substitute demonstrates superior reverse leakage characteristics (200 µA versus 1 mA at 45 V) and an extended lower operating temperature limit (-65°C versus -55°C), which may provide marginal performance advantages in specific thermal environments. However, these differences do not alter substitution eligibility.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification, ensuring regulatory compatibility in current manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can the MBRB3045CT-1G be used as a direct replacement for the 30CTQ045-1 in existing designs?

A: Yes. The MBRB3045CT-1G is electrically and mechanically equivalent to the 30CTQ045-1. Both devices share identical voltage ratings (45 V), current ratings (15 A per diode), forward voltage characteristics (620 mV @ 15 A), and package configuration (TO-262-3 Long Leads, I2PAK). Pin-to-pin compatibility and circuit performance are maintained.

Q: What is the significance of the Obsolete product status for the MBRB3045CT-1G?

A: Obsolete status indicates that onsemi has discontinued manufacturing of this part. While existing inventory may be available through distributors, future procurement cannot be guaranteed. The 30CTQ045-1 (Active status) is the recommended selection for new designs and long-term production planning.

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

A: Yes. The 30CTQ045-1 specifies 1 mA reverse leakage at 45 V, while the MBRB3045CT-1G specifies 200 µA at the same conditions. The substitute exhibits lower leakage, which may reduce power dissipation in high-impedance applications. This difference does not prevent substitution but should be noted for thermal analysis in specific circuit topologies.

Q: Do both parts meet current regulatory compliance requirements?

A: Yes. Both the 30CTQ045-1 and MBRB3045CT-1G are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), confirming compatibility with current manufacturing and environmental standards.

Q: What is the operating temperature range difference?

A: The 30CTQ045-1 operates from -55°C to 175°C junction temperature, while the MBRB3045CT-1G operates from -65°C to 175°C. The substitute supports a 10°C lower minimum temperature, which may be advantageous in cold-environment applications. Both parts share the same maximum temperature rating.

Q: Are the TO-262-3 Long Leads packages identical between manufacturers?

A: Yes. Both parts use the TO-262-3 Long Leads (I2PAK, TO-262AA) package configuration. Through-hole mounting, lead spacing, and mechanical dimensions are equivalent, ensuring PCB layout compatibility without modification.