SMP30A-E3/85A Equivalent & Substitute Parts

Part Overview

The SMP30A-E3/85A is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® and eSMP® series. This component is designed for general-purpose transient voltage suppression applications with a 30V reverse standoff voltage and 48.4V maximum clamping voltage. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

SMP30A-E3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 813SMP30A-E3/85A Datasheet

Current PartRFQ

SMP30A-M3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 10629SMP30A-M3/85A Datasheet

DirectRFQ

PTVS30VS1UR,115

Nexperia USA Inc.In Stock: 18886PTVS30VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMP30A-E3/85A is determined by electrical equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 30V
• Voltage - Clamping (Max) @ Ipp: 48.4V
• Current - Peak Pulse (10/1000µs): 8.3A
• Power - Peak Pulse: 400W
• Operating Temperature Range: -55°C ~ 150°C
• Unidirectional Zener Type configuration
• RoHS3 Compliance and MSL 1 rating

Two substitute parts meet these electrical criteria:

1. SMP30A-M3/85A (Vishay) – Direct manufacturer equivalent with identical electrical specifications, differing only in packaging format (Tape & Reel vs. bulk) and active product status.

2. PTVS30VS1UR,115 (Nexperia) – Manufacturer-recommended equivalent with identical electrical performance, available in SOD-123W package with automotive-grade qualification (AEC-Q101).

Parameter Comparison

Engineering Selection Recommendations

SMP30A-M3/85A is the primary direct substitute for the obsolete SMP30A-E3/85A. Both components are manufactured by Vishay with identical electrical specifications and the same DO-220AA package. The SMP30A-M3/85A maintains active product status with significantly higher inventory availability (10,617 pcs vs. 758 pcs), ensuring long-term supply continuity. This part is recommended for applications requiring the original DO-220AA form factor.

PTVS30VS1UR,115 is the manufacturer-recommended alternative from Nexperia, offering identical electrical performance with the addition of AEC-Q101 automotive-grade qualification. This part uses the SOD-123W package, which is smaller than the DO-220AA. Selection of this part requires PCB layout modification to accommodate the different package footprint. The automotive qualification makes this part suitable for automotive and high-reliability applications where such certification is required.

Both substitute parts maintain full RoHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing processes and long-term storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SMP30A-M3/85A be used as a direct replacement for SMP30A-E3/85A?

A: Yes. Both parts are electrically identical with matching voltage ratings (30V standoff, 48.4V clamping), current handling (8.3A peak pulse), and power dissipation (400W). Both use the DO-220AA package. The primary difference is packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete).

Q: What is the key difference between SMP30A-M3/85A and PTVS30VS1UR,115?

A: The electrical specifications are identical. The main differences are: manufacturer (Vishay vs. Nexperia), package type (DO-220AA vs. SOD-123W), and automotive qualification (PTVS30VS1UR,115 carries AEC-Q101 certification). Package selection depends on PCB layout constraints and application requirements.

Q: Can PTVS30VS1UR,115 be used without PCB redesign?

A: No. The PTVS30VS1UR,115 uses SOD-123W package while the original uses DO-220AA. These packages have different footprints and pin configurations, requiring PCB layout modification.

Q: Are all three parts RoHS3 compliant?

A: Yes. SMP30A-E3/85A, SMP30A-M3/85A, and PTVS30VS1UR,115 are all ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute part should be selected for automotive applications?

A: PTVS30VS1UR,115 is qualified to AEC-Q101 automotive standards. If automotive qualification is required, this part is the appropriate choice, provided PCB layout can accommodate the SOD-123W package.

Q: What is the inventory status of substitute parts?

A: SMP30A-M3/85A has 10,617 pcs in stock. PTVS30VS1UR,115 has 18,860 pcs in stock. Both parts have significantly higher availability than the obsolete SMP30A-E3/85A (758 pcs).