SMP33A-E3/85A Equivalent & Substitute Parts

Part Overview

The SMP33A-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 protection in surface-mount applications, featuring a 33V reverse standoff voltage and 53.3V maximum clamping voltage. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

SMP33A-E3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 787SMP33A-E3/85A Datasheet

Current PartRFQ

SMP33A-M3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1124SMP33A-M3/85A Datasheet

DirectRFQ

PTVS33VS1UR,115

Nexperia USA Inc.In Stock: 18980PTVS33VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMP33A-E3/85A is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff: 33V
• Voltage - Breakdown (Min): 36.7V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Current - Peak Pulse (10/1000µs): 7.5A
• Power - Peak Pulse: 400W
• Operating Temperature Range: -55°C ~ 150°C
• Unidirectional Channels: 1
• Type: Zener
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts must maintain identical electrical performance across all voltage and current ratings. Package differences are permitted when mechanical constraints allow for board-level integration. Product status transitions from obsolete to active are acceptable when all electrical specifications remain unchanged.

Parameter Comparison

Engineering Selection Recommendations

SMP33A-M3/85A is the direct equivalent from Vishay General Semiconductor - Diodes Division, differing only in product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). This part maintains identical electrical specifications and is recommended as the primary replacement for the obsolete SMP33A-E3/85A.

PTVS33VS1UR,115 from Nexperia USA Inc. provides electrical equivalence with identical voltage and current ratings. This part carries AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade components. The package differs (SOD-123W versus DO-220AA), requiring PCB layout verification for mechanical compatibility.

Both substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can SMP33A-M3/85A be used as a direct replacement for SMP33A-E3/85A?

A: Yes. Both parts are manufactured by Vishay and share identical electrical specifications: 33V reverse standoff, 36.7V minimum breakdown, 53.3V maximum clamping voltage, and 7.5A peak pulse current. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). Electrical performance is equivalent.

Q: What are the package differences between the substitute parts?

A: SMP33A-M3/85A uses DO-220AA packaging, identical to the original part. PTVS33VS1UR,115 uses SOD-123W packaging, which is physically smaller. PCB layout and footprint compatibility must be verified before selecting the SOD-123W variant.

Q: Is PTVS33VS1UR,115 suitable for automotive applications?

A: PTVS33VS1UR,115 carries AEC-Q101 automotive qualification. If your application requires automotive-grade components, this part meets that requirement. The original SMP33A-E3/85A does not carry automotive qualification.

Q: Are all substitute parts RoHS compliant?

A: Yes. SMP33A-M3/85A and PTVS33VS1UR,115 are both ROHS3 compliant, matching the compliance status of the original SMP33A-E3/85A.

Q: What is the operating temperature range for each part?

A: All three parts operate across -55°C to 150°C. SMP33A-E3/85A and SMP33A-M3/85A specify this as junction temperature (TJ). PTVS33VS1UR,115 specifies this as ambient temperature (TA). Electrical performance remains equivalent across the specified range.