SMP33-E3/84A Equivalent & Substitute Parts

Part Overview

The SMP33-E3/84A is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional zener diode is designed for general-purpose transient voltage suppression applications, featuring a 33V reverse standoff voltage and 59V maximum clamping voltage. The device is housed in a DO-220AA (SMP) surface mount package and operates across a temperature range of -55°C to 150°C. With 823 units currently in stock and active product status, the SMP33-E3/84A remains available for new designs. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and package options while maintaining electrical performance within specified parameters.

Substiute Parts

SMP33-E3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 924SMP33-E3/84A Datasheet

Current PartRFQ

PTVS36VS1UR,115

Nexperia USA Inc.In Stock: 18987PTVS36VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMP33-E3/84A is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 33V nominal (substitute range: 33-36V acceptable)
• Voltage - Clamping (Max) @ Ipp: 59V maximum (substitute range: ≤59V)
• Current - Peak Pulse (10/1000µs): 6.8A minimum (substitute range: ≥6.8A)
• Power - Peak Pulse: 400W minimum (substitute range: ≥400W)
• Operating Temperature Range: -55°C to 150°C minimum

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package compatibility: DO-220AA or equivalent footprint

Compliance Requirements:

• RoHS3 Compliant
• REACH Unaffected status

The PTVS36VS1UR,115 qualifies as a manufacturer-recommended substitute based on these parameters. While the reverse standoff voltage is 36V (3V higher than the SMP33-E3/84A), the clamping voltage (58.1V) and peak pulse current (6.9A) remain within acceptable operating margins. The substitute maintains identical power dissipation capability (400W) and operating temperature range (-55°C to 150°C). Package transition from DO-220AA to SOD-123W represents a footprint change requiring PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

SMP33-E3/84A Selection:

• Primary choice when DO-220AA package footprint is fixed in PCB design
• Preferred for designs with 33V nominal reverse standoff voltage specification
• Recommended when Vishay component qualification is required
• Suitable for applications with existing inventory and supply chain established

PTVS36VS1UR,115 Selection:

• Alternative when SOD-123W package footprint is acceptable or preferred
• Applicable for designs tolerating 36V reverse standoff voltage
• Recommended when Nexperia component qualification is required or mandated
• Suitable for automotive applications requiring AEC-Q101 qualification
• Preferred when higher inventory availability (18,960 units) is advantageous for supply chain continuity

Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute part includes automotive-grade qualification (AEC-Q101), which may be beneficial for applications requiring automotive-level reliability assurance.

Frequently Asked Questions (FAQ)

Q: Can PTVS36VS1UR,115 directly replace SMP33-E3/84A without PCB modification?

A: No. While electrical parameters are compatible, the package change from DO-220AA to SOD-123W requires PCB layout modification. Footprint, pad spacing, and trace routing differ between these packages.

Q: What is the significance of the 3V difference in reverse standoff voltage?

A: The PTVS36VS1UR,115 has a 36V reverse standoff voltage compared to 33V for the SMP33-E3/84A. This 3V difference means the substitute will trigger suppression at a slightly higher voltage threshold. For applications with strict voltage tolerance requirements, this difference must be evaluated against circuit specifications.

Q: Are both parts RoHS compliant?

A: Yes. Both SMP33-E3/84A and PTVS36VS1UR,115 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What does AEC-Q101 qualification on the substitute part mean?

A: AEC-Q101 is an automotive electronics qualification standard. The PTVS36VS1UR,115 meets this qualification, indicating suitability for automotive applications requiring enhanced reliability testing and quality assurance. The main part does not carry this designation.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. If the circuit design specifies 33V reverse standoff voltage and DO-220AA package, use SMP33-E3/84A. If 36V standoff voltage is acceptable and SOD-123W package is preferred or required, use PTVS36VS1UR,115. Verify electrical specifications against circuit protection requirements before final selection.

Q: Is the clamping voltage difference significant?

A: The clamping voltage difference is 0.9V (59V vs 58.1V), representing a 1.5% variation. Both values fall within typical TVS diode performance margins and are generally considered compatible for general-purpose transient suppression applications.