BZX85C8V2-TAP Equivalent & Substitute Parts

Part Overview

The BZX85C8V2-TAP is an 8.2 V Zener diode rated at 1.3 W maximum power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates across the temperature range of -55°C to 175°C and carries automotive-grade qualification under AEC-Q101. The part is actively produced and maintains RoHS3 compliance with unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative sources and packaging configurations may be required due to inventory availability, supply chain considerations, or specific application constraints.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	8.2	V
Power - Maximum	1.3	W
Tolerance	±5%	-
Impedance (Maximum)	5	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 6.2 V
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-204AL (DO-41)	-
Mounting Type	Through Hole	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Nominal Zener voltage (Vz) must match at 8.2 V
Maximum power dissipation rating must equal or exceed 1.3 W
Reverse leakage current characteristics must be compatible with circuit requirements
Impedance (Zzt) must remain within acceptable operating limits
Operating temperature range must encompass the application environment

Mechanical Compatibility Criteria:

Package type must be DO-204AL (DO-41) axial through-hole configuration
Mounting type must be through-hole
Physical dimensions must be identical for PCB layout compatibility

Compliance and Qualification:

RoHS compliance status must be maintained
Automotive-grade qualification (AEC-Q101) is required for automotive applications

Substitute parts are grouped into two categories: parametric equivalents (matching all electrical specifications within tolerance) and manufacturer-recommended alternatives (meeting core electrical requirements with acceptable variations in secondary parameters).

Parameter Comparison

Parameter	BZX85C8V2-TAP	BZX85B8V2-TAP	1N4738A	1N4738A-T50R	1N4738ATR
Manufacturer	Vishay	Vishay	Lumimax	Fairchild	Fairchild
Voltage - Zener (Nom)	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V
Tolerance	±5%	±2%	±5%	±5%	±5%
Power - Max	1.3 W	1.3 W	1 W	1 W	1 W
Impedance (Max)	5 Ohms	5 Ohms	4.5 Ohms	4.5 Ohms	4.5 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 6.2 V	1 µA @ 6.2 V	10 µA @ 6 V	10 µA @ 6 V	10 µA @ 6 V
Operating Temperature	-55 to 175°C	-55 to 175°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Package / Case	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Grade	Automotive	Automotive	-	-	-
Qualification	AEC-Q101	AEC-Q101	-	-	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	-	-

Engineering Selection Recommendations

BZX85B8V2-TAP is a parametric equivalent substitute. This part maintains identical electrical specifications to the BZX85C8V2-TAP with improved tolerance performance (±2% versus ±5%). Both components are manufactured by Vishay, carry AEC-Q101 automotive qualification, and operate across the same temperature range. The BZX85B8V2-TAP is suitable for direct replacement in automotive applications requiring AEC-Q101 compliance.

1N4738A, 1N4738A-T50R, and 1N4738ATR are manufacturer-recommended alternatives that meet core electrical requirements. These parts maintain the 8.2 V nominal Zener voltage and DO-41 package configuration. However, the maximum power rating is reduced to 1 W (compared to 1.3 W), and reverse leakage current is elevated to 10 µA. These alternatives lack automotive-grade qualification and AEC-Q101 certification. Selection of these parts is appropriate only for non-automotive applications or where the reduced power rating is acceptable within circuit design margins.

For automotive applications requiring AEC-Q101 compliance, the BZX85B8V2-TAP is the preferred substitute. For general-purpose applications where automotive qualification is not required, the 1N4738A series provides functional equivalence with broader temperature operating range (-65°C to 200°C).

Frequently Asked Questions (FAQ)

Q: Can the 1N4738A series replace the BZX85C8V2-TAP in automotive applications?

A: The 1N4738A series does not carry AEC-Q101 automotive qualification. Substitution in automotive applications is not supported unless the application does not require automotive-grade components. Verify application requirements before selection.

Q: What is the significance of the tolerance difference between BZX85C8V2-TAP (±5%) and BZX85B8V2-TAP (±2%)?

A: The BZX85B8V2-TAP provides tighter Zener voltage tolerance, resulting in more precise voltage regulation. This is advantageous in applications with strict voltage tolerance requirements. Both parts are electrically compatible for direct substitution.

Q: Why is the maximum power rating different between the BZX85C8V2-TAP (1.3 W) and the 1N4738A series (1 W)?

A: The 1N4738A series is rated at 1 W maximum power dissipation, which is lower than the 1.3 W rating of the BZX85C8V2-TAP. Applications requiring sustained power dissipation above 1 W must use the BZX85C8V2-TAP or BZX85B8V2-TAP. Verify circuit power requirements before substitution.

Q: Are all substitute parts compatible with the same PCB layout?

A: All listed substitute parts use the DO-204AL (DO-41) axial through-hole package. Physical dimensions are identical, and direct PCB layout compatibility is maintained across all substitutes.

Q: What is the difference between the packaging formats (Cut Tape, Tape & Box, Bulk)?

A: Packaging format refers to the supply method and does not affect electrical or mechanical compatibility. Cut Tape (CT) is supplied on continuous tape. Tape & Box (TB) includes tape wound in a box. Bulk packaging is supplied loose. Component selection should be based on procurement and assembly requirements.

Q: Can the 1N4738A-T50R and 1N4738ATR be used interchangeably?

A: Both parts are manufactured by Fairchild Semiconductor with identical electrical specifications (8.2 V, 1 W, ±5% tolerance). The primary difference is packaging format. Interchangeability is supported for applications where packaging format does not impose constraints.

Q: Is the extended operating temperature range of the 1N4738A series (-65°C to 200°C) an advantage over the BZX85C8V2-TAP (-55°C to 175°C)?

A: The extended temperature range of the 1N4738A series provides operational capability at lower and higher temperatures. Selection depends on application temperature requirements. For applications operating within -55°C to 175°C, both ranges are equivalent.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message