SMP17-E3/85A Equivalent & Substitute Parts

Part Overview

The SMP17-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 applications, featuring a 17V reverse standoff voltage and 30.5V maximum clamping voltage. The part is classified as obsolete, making identification of suitable equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

SMP17-E3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 822SMP17-E3/85A Datasheet

Current PartRFQ

SMP17-M3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 982SMP17-M3/85A Datasheet

DirectRFQ

PTVS18VS1UR,115

Nexperia USA Inc.In Stock: 18836PTVS18VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMP17-E3/85A is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage within acceptable tolerance of 17V
• Breakdown voltage minimum at or above 18.9V
• Clamping voltage maximum at or below 30.5V
• Peak pulse current capability at or above 13.1A
• Peak pulse power rating at or above 400W
• Operating temperature range encompassing -55°C to 150°C
• Unidirectional channel configuration (1 channel)
• Zener diode type

Mechanical Compatibility Criteria:

• Surface mount mounting type
• Package compatibility or functional equivalence

Two substitute parts meet these criteria: SMP17-M3/85A (direct Vishay equivalent) and PTVS18VS1UR,115 (Nexperia alternative with modified electrical characteristics).

Parameter Comparison

Engineering Selection Recommendations

SMP17-M3/85A (Direct Substitute - Recommended for Pin-Compatible Replacement)

The SMP17-M3/85A is the primary substitute for the obsolete SMP17-E3/85A. This part is manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) and maintains identical electrical specifications and package configuration. The SMP17-M3/85A carries Active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant and share equivalent moisture sensitivity levels. This substitute provides direct functional and mechanical compatibility with no design modifications required.

PTVS18VS1UR,115 (Alternative Substitute - Package Change Required)

The PTVS18VS1UR,115 manufactured by Nexperia USA Inc. serves as an alternative substitute when package form factor changes are acceptable. This part exhibits slightly modified electrical characteristics: reverse standoff voltage of 18V (versus 17V), breakdown voltage minimum of 20V (versus 18.9V), and clamping voltage maximum of 29.2V (versus 30.5V). Peak pulse current capability is marginally higher at 13.7A. The package changes from DO-220AA to SOD-123W, requiring PCB layout modifications. This part carries AEC-Q101 automotive qualification and Active product status. ROHS3 compliance is maintained.

Selection between these substitutes depends on design constraints: choose SMP17-M3/85A for direct replacement without layout changes; select PTVS18VS1UR,115 only when the modified electrical parameters and SOD-123W package are compatible with system requirements.

Frequently Asked Questions (FAQ)

Q: Can SMP17-M3/85A be used as a direct replacement for SMP17-E3/85A without any modifications?

A: Yes. The SMP17-M3/85A is electrically and mechanically identical to the SMP17-E3/85A. Both parts share the same reverse standoff voltage (17V), breakdown voltage (18.9V minimum), clamping voltage (30.5V maximum), peak pulse current (13.1A), and DO-220AA package configuration. No PCB layout or circuit modifications are required.

Q: What are the key differences between SMP17-M3/85A and PTVS18VS1UR,115?

A: The primary differences are manufacturer, package type, and electrical specifications. SMP17-M3/85A maintains the original DO-220AA package and 17V reverse standoff voltage. PTVS18VS1UR,115 uses a SOD-123W package and has a 18V reverse standoff voltage with 29.2V maximum clamping voltage. The Nexperia part also carries AEC-Q101 automotive qualification. Package differences require PCB redesign if switching between these parts.

Q: Is the PTVS18VS1UR,115 suitable for applications requiring exactly 17V reverse standoff voltage?

A: The PTVS18VS1UR,115 has an 18V reverse standoff voltage, which is 1V higher than the original specification. This difference may affect circuit performance in applications with tight voltage tolerance requirements. Verify that the modified standoff voltage is compatible with your specific application before selection.

Q: Are all three parts RoHS compliant?

A: Yes. SMP17-E3/85A, SMP17-M3/85A, and PTVS18VS1UR,115 are all ROHS3 compliant. Moisture sensitivity level is 1 (Unlimited) for all parts.

Q: What is the difference between operating temperature specifications (TJ vs TA) for these parts?

A: SMP17-E3/85A and SMP17-M3/85A specify operating temperature as -55°C ~ 150°C (TJ), where TJ represents junction temperature. PTVS18VS1UR,115 specifies -55°C ~ 150°C (TA), where TA represents ambient temperature. Both temperature ranges are functionally equivalent for general-purpose applications within the stated limits.

Q: Can I use PTVS18VS1UR,115 in a design originally specified for SMP17-E3/85A?

A: Substitution is possible only if the modified electrical parameters (18V reverse standoff, 29.2V clamping voltage) and SOD-123W package are compatible with your circuit design. PCB layout modifications are required due to package differences. Electrical parameter verification is mandatory before implementation.