PTV3.9B-E3/84A Equivalent & Substitute Parts

Part Overview

The PTV3.9B-E3/84A is a Zener diode rated at 4.2 V nominal with 600 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is packaged in the DO-220AA (SMP) surface mount configuration and is part of the eSMP® series. The PTV3.9B-E3/84A is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	4.2 V
Tolerance	±6%
Power - Max	600 mW
Impedance (Max) (Zzt)	15 Ohms
Current - Reverse Leakage @ Vr	20 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	150°C
Package / Case	DO-220AA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PTV3.9B-E3/84A is determined by electrical and mechanical parameter equivalence within the Zener diode category. The critical parameters governing substitution are:

Electrical Parameters:

Zener voltage: 4.2 V nominal
Tolerance: ±6%
Maximum power dissipation: 600 mW
Maximum impedance: 15 Ohms
Reverse leakage current: 20 µA @ 1 V
Forward voltage: 1.5 V @ 200 mA
Operating temperature: 150°C

Mechanical Parameters:

Package type: DO-220AA (SMP)
Mounting type: Surface Mount

The substitute parts PTV3.9B-M3/84A and PTV3.9B-M3/85A are parametrically equivalent to the main part across all electrical and mechanical specifications. The primary distinction between the main part and substitutes is product status and packaging format. The main part (PTV3.9B-E3/84A) is obsolete, while both substitute parts are active. The substitutes are supplied in Tape & Reel (TR) packaging, whereas the main part packaging format is not specified.

Parameter Comparison

Parameter	PTV3.9B-E3/84A (Main)	PTV3.9B-M3/84A (Substitute)	PTV3.9B-M3/85A (Substitute)
Voltage - Zener (Nom) (Vz)	4.2 V	4.2 V	4.2 V
Tolerance	±6%	±6%	±6%
Power - Max	600 mW	600 mW	600 mW
Impedance (Max) (Zzt)	15 Ohms	15 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	20 µA @ 1 V	20 µA @ 1 V	20 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	150°C	150°C	150°C
Package / Case	DO-220AA	DO-220AA	DO-220AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The PTV3.9B-M3/84A and PTV3.9B-M3/85A are direct functional equivalents to the obsolete PTV3.9B-E3/84A. Both substitute parts maintain identical electrical specifications and package configuration while offering active product status from the manufacturer.

Selection between the two substitute parts is not differentiated by electrical or mechanical parameters, as both are parametrically identical. The choice between PTV3.9B-M3/84A and PTV3.9B-M3/85A is determined by inventory availability and procurement requirements. PTV3.9B-M3/84A has higher inventory availability (6836 Pcs), while PTV3.9B-M3/85A has lower availability (725 Pcs).

Both substitute parts comply with ROHS3 and are REACH Unaffected, maintaining regulatory compliance equivalent to the main part. The Moisture Sensitivity Level (MSL) of 1 (Unlimited) applies to all three parts, indicating no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can PTV3.9B-M3/84A or PTV3.9B-M3/85A be used as direct replacements for PTV3.9B-E3/84A?

A: Yes. Both substitute parts are parametrically equivalent across all electrical and mechanical specifications. The Zener voltage, power rating, impedance, leakage current, forward voltage, operating temperature, and package configuration are identical. The primary difference is product status: the main part is obsolete while the substitutes are active.

Q: What is the difference between PTV3.9B-M3/84A and PTV3.9B-M3/85A?

A: Both parts are electrically and mechanically identical. The only distinction is inventory availability. PTV3.9B-M3/84A has 6836 Pcs in stock, while PTV3.9B-M3/85A has 725 Pcs in stock. Selection should be based on procurement quantity requirements and lead time considerations.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: No. All three parts share identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and Moisture Sensitivity Level 1 (Unlimited). Regulatory and environmental requirements are equivalent across all parts.

Q: What packaging format is used for the substitute parts?

A: Both substitute parts are supplied in Tape & Reel (TR) packaging, which is standard for high-volume surface mount component distribution. This format is compatible with automated assembly processes.

Q: Are the electrical parameters of the substitutes guaranteed to match the main part specifications?

A: Yes. All electrical parameters including Zener voltage (4.2 V), tolerance (±6%), power dissipation (600 mW), impedance (15 Ohms maximum), reverse leakage current (20 µA @ 1 V), and forward voltage (1.5 V @ 200 mA) are identical across all three parts.

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