SMPZ3935B-E3/84A Equivalent & Substitute Parts

Part Overview

The SMPZ3935B-E3/84A is a surface mount Zener diode rated at 27 V nominal with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, which necessitates identification of functionally equivalent substitute parts for ongoing design support and procurement continuity. The part is housed in a DO-220AA (SMP) package and complies with ROHS3 and REACH standards.

Substiute Parts

SMPZ3935B-E3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1178SMPZ3935B-E3/84A Datasheet

Current PartRFQ

SMPZ3935B-M3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 990SMPZ3935B-M3/84A Datasheet

DirectRFQ

SMPZ3935B-M3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1130SMPZ3935B-M3/85A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMPZ3935B-E3/84A is determined by electrical and mechanical parameter equivalence. The substitute parts SMPZ3935B-M3/84A and SMPZ3935B-M3/85A maintain identical specifications across all critical parameters:

Electrical Parameters (Must Match):

• Zener voltage: 27 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 500 mW
• Maximum impedance: 23 Ohms
• Reverse leakage current: 500 nA @ 20.6 V
• Forward voltage: 1.5 V @ 200 mA

Mechanical Parameters (Must Match):

• Package type: DO-220AA (SMP)
• Mounting type: Surface Mount
• Operating temperature range: -65°C to 150°C

Compliance Parameters (Must Match):

• RoHS3 Compliant
• REACH Unaffected
• Moisture Sensitivity Level: 1 (Unlimited)

The primary distinction between the main part and substitutes is packaging format and product status. The main part (SMPZ3935B-E3/84A) is obsolete, while the substitute parts are active products available in Tape & Reel packaging.

Parameter Comparison

Engineering Selection Recommendations

Both SMPZ3935B-M3/84A and SMPZ3935B-M3/85A are direct functional equivalents to the obsolete SMPZ3935B-E3/84A. Selection between these active alternatives is based on procurement and supply chain considerations rather than electrical or mechanical differences.

SMPZ3935B-M3/84A and SMPZ3935B-M3/85A are both active products with identical electrical specifications and compliance certifications. The distinction between these two part numbers reflects manufacturing lot or tape reel configuration differences, not functional performance variations. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental standards.

For applications currently using the obsolete SMPZ3935B-E3/84A, either active substitute part provides equivalent performance without circuit redesign or re-qualification requirements, provided the application accommodates Tape & Reel packaging format.

Frequently Asked Questions (FAQ)

Q: Can SMPZ3935B-M3/84A and SMPZ3935B-M3/85A be used interchangeably with SMPZ3935B-E3/84A?

A: Yes. All three parts share identical electrical parameters (27 V nominal Zener voltage, 500 mW power rating, ±5% tolerance, 23 Ohms maximum impedance) and mechanical specifications (DO-220AA package, surface mount configuration, -65°C to 150°C operating range). The substitute parts are active products, whereas the original part is obsolete.

Q: What is the difference between SMPZ3935B-M3/84A and SMPZ3935B-M3/85A?

A: Both parts are electrically and mechanically identical. The difference in part number suffix reflects manufacturing or packaging lot designation. No functional distinction exists between these two part numbers for circuit application purposes.

Q: Does the packaging format change affect circuit design?

A: The original part (SMPZ3935B-E3/84A) is supplied in bulk format, while the substitute parts (SMPZ3935B-M3/84A and SMPZ3935B-M3/85A) are supplied in Tape & Reel format. This affects procurement and assembly processes but does not alter component electrical performance or PCB footprint requirements. The DO-220AA package remains consistent across all three parts.

Q: Are the substitute parts compliant with current environmental regulations?

A: Yes. Both SMPZ3935B-M3/84A and SMPZ3935B-M3/85A are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Moisture Sensitivity Level is 1 (Unlimited) for all parts.

Q: What is the operating temperature range for these Zener diodes?

A: The operating temperature range is -65°C to 150°C for the SMPZ3935B-E3/84A and both substitute parts. This specification is identical across all three part numbers.

Q: Can these parts be used in high-reliability applications?

A: All three parts are manufactured by Vishay General Semiconductor - Diodes Division and comply with ROHS3 and REACH standards. The Moisture Sensitivity Level of 1 (Unlimited) indicates no moisture sensitivity constraints. Component selection for high-reliability applications requires evaluation against specific application requirements and qualification standards beyond the scope of this equivalency reference.