SMP24A-E3/85A Equivalent & Substitute Parts

Part Overview

The SMP24A-E3/85A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for general-purpose transient voltage suppression applications, featuring a 24V reverse standoff voltage and 38.9V maximum clamping voltage. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

SMP24A-E3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1167SMP24A-E3/85A Datasheet

Current PartRFQ

SMP24A-M3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 663SMP24A-M3/85A Datasheet

DirectRFQ

PTVS24VS1UR,115

Nexperia USA Inc.In Stock: 18719PTVS24VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMP24A-E3/85A is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff: 24V
• Voltage - Breakdown (Min): 26.7V
• Voltage - Clamping (Max) @ Ipp: 38.9V
• Current - Peak Pulse (10/1000µs): 10.3A
• Power - Peak Pulse: 400W
• Operating Temperature Range: -55°C ~ 150°C
• Unidirectional Channels: 1
• Type: Zener
• RoHS3 Compliance

Substitute parts are grouped into two categories based on packaging configuration and product status:

Category 1: Same Package (DO-220AA) – Direct mechanical and electrical equivalents with identical package footprint.

Category 2: Alternative Package (SOD-123W) – Electrical equivalents with different surface-mount package, requiring PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

SMP24A-M3/85A is the primary substitute for SMP24A-E3/85A. Both components share identical electrical specifications and the same DO-220AA package footprint. The SMP24A-M3/85A is currently in active production status, ensuring long-term availability and supply chain continuity. The only difference is packaging format: SMP24A-E3/85A uses standard packaging while SMP24A-M3/85A is supplied in Tape & Reel (TR) format. No PCB layout modifications are required.

PTVS24VS1UR,115 is a manufacturer-recommended alternative from Nexperia USA Inc. This component meets all electrical specifications and is AEC-Q101 qualified for automotive applications. However, it uses the SOD-123W package instead of DO-220AA, requiring PCB footprint redesign. This substitute is appropriate when package size reduction is a design objective or when automotive-grade qualification is required.

Frequently Asked Questions (FAQ)

Q: Can SMP24A-M3/85A be used as a direct replacement for SMP24A-E3/85A?

A: Yes. Both components have identical electrical parameters and the same DO-220AA surface-mount package. The difference is packaging format (Tape & Reel vs. standard packaging). No design changes are required.

Q: What is the difference between SMP24A-E3/85A and PTVS24VS1UR,115?

A: The electrical specifications are identical. The primary difference is the package: SMP24A-E3/85A uses DO-220AA while PTVS24VS1UR,115 uses SOD-123W. PTVS24VS1UR,115 is also AEC-Q101 qualified. PCB layout modification is necessary if switching to PTVS24VS1UR,115.

Q: Why is SMP24A-E3/85A marked as obsolete?

A: Obsolete status indicates the part is no longer in active production. SMP24A-M3/85A is the active equivalent from the same manufacturer and series.

Q: Are all three parts RoHS3 compliant?

A: Yes. SMP24A-E3/85A, SMP24A-M3/85A, and PTVS24VS1UR,115 are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Can PTVS24VS1UR,115 be used in automotive applications?

A: Yes. PTVS24VS1UR,115 carries AEC-Q101 qualification, making it suitable for automotive-grade designs. The other two parts do not carry this certification.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by matching: reverse standoff voltage (24V), breakdown voltage (26.7V minimum), clamping voltage (38.9V maximum), peak pulse current (10.3A), peak pulse power (400W), operating temperature range (-55°C to 150°C), and unidirectional channel configuration. Package compatibility is a secondary consideration.