PTV18B-E3/85A Zener Diode Equivalent & Substitute Parts

Part Overview

The PTV18B-E3/85A is a surface mount Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 19.2 V nominal Zener voltage with 600 mW power dissipation capability. This component belongs to the eSMP® series and is packaged in the DO-220AA (SMP) form factor for automated assembly processes.

The PTV18B-E3/85A carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Substiute Parts

PTV18B-E3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 865PTV18B-E3/85A Datasheet

Current PartRFQ

PTV18B-M3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 933PTV18B-M3/84A Datasheet

DirectRFQ

PTV18B-M3/85A

Vishay General Semiconductor - Diodes DivisionIn Stock: 989PTV18B-M3/85A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PTV18B-E3/85A are determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Zener voltage: 19.2 V nominal
• Tolerance: ±6%
• Maximum power dissipation: 600 mW
• Maximum impedance: 12 Ohms
• Reverse leakage current: 10 µA @ 13 V
• Forward voltage: 1.5 V @ 200 mA maximum

Mechanical & Package Specifications:

• Package type: DO-220AA (SMP)
• Mounting type: Surface Mount
• Series designation: eSMP®

Compliance & Regulatory:

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

The substitute parts PTV18B-M3/84A and PTV18B-M3/85A meet all electrical and mechanical requirements. Both are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical specifications for voltage regulation, power handling, and thermal performance. The primary distinction is product status: both substitute parts carry Active status, providing improved supply availability compared to the Obsolete main part.

Parameter Comparison

Engineering Selection Recommendations

Both PTV18B-M3/84A and PTV18B-M3/85A are direct functional equivalents to the PTV18B-E3/85A. Selection between these substitute parts is based on the following factors:

Product Status & Supply Continuity: The PTV18B-E3/85A is classified as Obsolete. The substitute parts PTV18B-M3/84A and PTV18B-M3/85A both carry Active product status, ensuring long-term availability and supply chain stability. Current inventory levels for both substitutes exceed 910 units.

Regulatory & Compliance Alignment: All three parts maintain identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and Moisture Sensitivity Level 1 (Unlimited). No compliance barriers exist for substitution in applications requiring these certifications.

Electrical & Thermal Performance: The substitute parts deliver identical electrical performance across all specified parameters: 19.2 V Zener voltage, 600 mW power rating, 12 Ohms maximum impedance, and 150°C operating temperature. Thermal and electrical behavior in circuit applications remains unchanged.

Package & Assembly Compatibility: Both substitute parts utilize the DO-220AA (SMP) package with surface mount configuration, maintaining full compatibility with existing PCB designs, assembly processes, and automated placement equipment.

Frequently Asked Questions (FAQ)

Q: Can PTV18B-M3/84A and PTV18B-M3/85A be used interchangeably with PTV18B-E3/85A?

A: Yes. Both substitute parts meet all electrical, mechanical, and regulatory specifications of the PTV18B-E3/85A. Zener voltage, power dissipation, impedance, leakage current, forward voltage, operating temperature, and package configuration are identical. Direct substitution is supported without circuit modification.

Q: What is the significance of the part number suffix differences (E3 versus M3)?

A: The suffix designates the manufacturing process or tape reel configuration. The electrical and functional specifications remain identical across all three part numbers. The suffix does not affect circuit performance or compatibility.

Q: Why is the PTV18B-E3/85A marked as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The substitute parts PTV18B-M3/84A and PTV18B-M3/85A are Active products from the same manufacturer, providing equivalent functionality with ongoing manufacturing support.

Q: Are there any thermal or reliability differences between the main part and substitutes?

A: No. All three parts specify identical maximum operating temperature (150°C), power dissipation (600 mW), and thermal characteristics. Reliability and thermal performance in circuit applications are equivalent.

Q: What is the Moisture Sensitivity Level (MSL) rating, and does it affect substitution?

A: All three parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Storage, handling, and assembly processes are identical for all parts. No special precautions are required.

Q: Can these Zener diodes be used in high-frequency applications?

A: The maximum impedance specification (12 Ohms) and forward voltage characteristics (1.5 V @ 200 mA) define the frequency response capability. All three parts carry identical impedance ratings, supporting equivalent high-frequency performance.

Q: Is the DO-220AA package suitable for automated PCB assembly?

A: Yes. The DO-220AA (SMP) package is designed for surface mount automated assembly. All three parts use this package type and are supplied in Tape & Reel (TR) format for pick-and-place equipment compatibility.