NSB8AT-E3/45 Equivalent & Substitute Parts

Part Overview

The NSB8AT-E3/45 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 50 V DC reverse voltage with an 8 A average rectified current rating in a TO-263AB (D2PAK) package. The part is designated as Last Time Buy, indicating discontinued production status. Identification of equivalent and substitute parts is necessary to ensure continued design support and procurement availability for applications currently utilizing this component.

Substiute Parts

NSB8AT-E3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 1115NSB8AT-E3/45 Datasheet

Current PartRFQ

NSB8GT-M3/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 971NSB8GT-M3/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NSB8AT-E3/45 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Current - Average Rectified (Io): 8 A
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 8 A
• Speed: Standard Recovery >500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 10 µA
• Capacitance @ Vr, F: 55 pF @ 4V, 1MHz
• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Operating Temperature - Junction: -55°C to 150°C
• Mounting Type: Surface Mount

Allowable Variation Parameter:

• Voltage - DC Reverse (Vr) (Max): Substitute parts may exceed the 50 V rating, provided all other electrical and mechanical parameters remain identical. Higher voltage ratings are acceptable in applications where the original 50 V specification is not a limiting design constraint.

The NSB8GT-M3/I qualifies as a substitute part based on matching all mandatory parameters while providing an elevated voltage rating of 400 V.

Parameter Comparison

Engineering Selection Recommendations

The NSB8GT-M3/I is a direct substitute for the NSB8AT-E3/45 based on electrical and mechanical parameter equivalence. The substitute part maintains all critical functional specifications including current rating, forward voltage drop, recovery speed, reverse leakage characteristics, and thermal operating range. The TO-263AB package and surface mount configuration are identical, ensuring PCB layout and assembly compatibility.

The elevated voltage rating of 400 V in the substitute part does not create a functional incompatibility. Applications designed for 50 V operation will function correctly with a 400 V rated component, as the substitute part will operate within its safe operating area at the lower voltage stress.

The NSB8GT-M3/I carries Active product status, providing continued manufacturing availability and supply chain stability compared to the Last Time Buy status of the original part. This substitution supports long-term design continuity and procurement planning.

Frequently Asked Questions (FAQ)

Q: Can the NSB8GT-M3/I replace the NSB8AT-E3/45 in existing designs?

A: Yes. The NSB8GT-M3/I is electrically and mechanically equivalent to the NSB8AT-E3/45 across all critical parameters. The identical current rating (8 A), forward voltage (1.1 V @ 8 A), recovery speed, reverse leakage, capacitance, and thermal range ensure functional compatibility. The TO-263AB package dimensions and pin configuration are identical, requiring no PCB modifications.

Q: Why does the substitute part have a higher voltage rating (400 V vs. 50 V)?

A: The NSB8GT-M3/I is designed for higher voltage applications but maintains all other electrical characteristics identical to the NSB8AT-E3/45. A higher voltage rating does not degrade performance in lower voltage applications. The component will operate safely at 50 V or below, as it is rated for 400 V maximum reverse voltage.

Q: Are there any thermal or current handling differences between these parts?

A: No. Both parts share identical operating temperature range (-55°C to 150°C) and average rectified current rating (8 A). Thermal performance and current handling capacity are equivalent.

Q: Is the package footprint identical between these parts?

A: Yes. Both parts use the TO-263-3 (D2PAK) package with 2 leads plus tab in TO-263AB configuration. No PCB layout changes are required for substitution.

Q: What is the significance of the Last Time Buy status on the original part?

A: Last Time Buy indicates the NSB8AT-E3/45 is no longer in active production. Existing inventory is available, but future procurement will not be possible. The NSB8GT-M3/I, with Active product status, provides a path for continued supply and design support beyond the original part's end-of-life.

Q: Are compliance certifications identical between these parts?

A: The NSB8AT-E3/45 is ROHS3 compliant with MSL 1 (Unlimited). Compliance data for the NSB8GT-M3/I is not provided in the available specifications. Verification of compliance certifications with the manufacturer is recommended for applications with specific regulatory requirements.