BZX55A8V2-TAP Equivalent & Substitute Parts

Part Overview

The BZX55A8V2-TAP is a Zener diode rated at 8.2 V nominal voltage with 500 mW maximum power dissipation, packaged in DO-204AH (DO-35) through-hole configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	8.2 V
Tolerance	±1%
Power - Max	500 mW
Impedance (Max)	7 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 6.2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	175°C
Package / Case	DO-204AH, DO-35, Axial
Mounting Type	Through Hole
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the BZX55A8V2-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 8.2 V nominal
Power rating: 500 mW maximum
Package type: DO-204AH (DO-35) through-hole axial configuration
Mounting type: Through hole

Secondary Compatibility Factors:

Impedance (Zzt): Maximum 7–8 Ohms
Reverse leakage current: Measured at specified reverse voltage
Forward voltage drop: Maximum 1.5 V at 200 mA
Operating temperature range: Minimum 175°C upper limit
Automotive grade and AEC-Q101 qualification (where applicable)
RoHS and REACH compliance status

Substitute parts must maintain the same zener voltage and power dissipation rating. Tolerance variations (±1%, ±2%, ±5%) are acceptable provided the application circuit design accounts for voltage regulation requirements. Impedance and leakage current variations within specified ranges do not prevent functional substitution in standard voltage regulation applications.

Parameter Comparison

Parameter	BZX55A8V2-TAP	BZX55B8V2-TAP	1N5237B	1N5998D	1N756A BK PBFREE
Manufacturer	Vishay	Vishay	Microchip	Microchip	Central Semiconductor
Voltage - Zener (Nom)	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V
Tolerance	±1%	±2%	±5%	±1%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	7 Ohms	7 Ohms	8 Ohms	7 Ohms	8 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 6.2 V	100 nA @ 6.2 V	3 µA @ 6.5 V	500 nA @ 6.5 V	100 nA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature (Max)	175°C	175°C	175°C	175°C	200°C
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-35	DO-35
Product Status	Obsolete	Active	Active	Active	Active
Grade	Automotive	Automotive	Not specified	Not specified	Not specified
Qualification	AEC-Q101	AEC-Q101	Not specified	Not specified	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Non-compliant	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: BZX55B8V2-TAP

The BZX55B8V2-TAP is the direct equivalent from the same manufacturer (Vishay). It maintains identical electrical specifications with the exception of tolerance (±2% versus ±1%) and operating temperature range (-65°C to 175°C versus 175°C maximum). This part is active in production, ROHS3 compliant, AEC-Q101 qualified, and automotive grade. The tolerance difference is acceptable for standard voltage regulation applications. This is the recommended first choice for direct replacement.

Secondary Substitute: 1N5998D

The 1N5998D from Microchip Technology matches the ±1% tolerance specification and maintains identical impedance (7 Ohms) and power rating. It provides an extended operating temperature range (-65°C to 175°C) and lower forward voltage drop (1.1 V at 200 mA). However, reverse leakage current is higher (500 nA at 6.5 V versus 100 nA at 6.2 V), and RoHS compliance is non-compliant. This part is suitable for applications where tighter tolerance control is required and RoHS non-compliance is acceptable.

Tertiary Substitutes: 1N5237B and 1N756A BK PBFREE

Both 1N5237B (Microchip) and 1N756A BK PBFREE (Central Semiconductor) provide functional equivalence with ±5% tolerance. The 1N5237B is RoHS non-compliant, while 1N756A BK PBFREE is ROHS3 compliant. The 1N756A BK PBFREE offers extended operating temperature to 200°C. These parts are suitable for applications where tolerance relaxation to ±5% is acceptable and component availability is prioritized.

Compliance Considerations:

For automotive applications requiring AEC-Q101 qualification, BZX55B8V2-TAP is the only active substitute with this certification. For applications requiring ROHS3 compliance, BZX55B8V2-TAP and 1N756A BK PBFREE are compliant options.

Frequently Asked Questions (FAQ)

Q: Can BZX55B8V2-TAP directly replace BZX55A8V2-TAP?

A: Yes. Both parts share identical zener voltage (8.2 V), power rating (500 mW), impedance (7 Ohms), and package configuration (DO-204AH/DO-35). The tolerance difference (±2% versus ±1%) is the only specification variance. BZX55B8V2-TAP is active in production and recommended for direct replacement.

Q: What is the impact of tolerance differences between substitute parts?

A: Tolerance specifications define the acceptable range of zener voltage around the nominal 8.2 V value. A ±1% tolerance allows ±0.082 V deviation, while ±5% allows ±0.41 V deviation. Circuit designs must account for these ranges in voltage regulation calculations. Tighter tolerance parts (±1%) provide more precise voltage regulation; relaxed tolerance parts (±5%) are acceptable for applications with wider voltage acceptance windows.

Q: Are all substitute parts suitable for automotive applications?

A: BZX55B8V2-TAP carries automotive grade designation and AEC-Q101 qualification. The other substitutes (1N5237B, 1N5998D, 1N756A BK PBFREE) do not specify automotive grade or AEC-Q101 qualification. For automotive applications requiring these certifications, BZX55B8V2-TAP is the appropriate choice.

Q: What is the significance of RoHS compliance status?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. BZX55B8V2-TAP and 1N756A BK PBFREE are ROHS3 compliant. The 1N5237B and 1N5998D are RoHS non-compliant. Component selection must align with end-product regulatory requirements and customer specifications.

Q: Can parts with different reverse leakage currents be substituted?

A: Yes, provided the application circuit design accommodates the leakage current variation. Reverse leakage current affects standby power consumption and voltage regulation precision. The 1N5237B exhibits higher leakage (3 µA at 6.5 V) compared to the main part (100 nA at 6.2 V). This difference is acceptable in most voltage regulation circuits but must be evaluated in low-power or precision applications.

Q: Is the forward voltage drop difference between 1N5998D (1.1 V) and other parts (1.5 V) significant?

A: Forward voltage drop affects power dissipation during forward conduction. The 1N5998D's lower forward voltage (1.1 V at 200 mA) results in reduced power loss compared to parts rated at 1.5 V. This difference is beneficial in high-current applications but does not prevent substitution in standard voltage regulation circuits.

Q: What package considerations apply to these substitutes?

A: All substitute parts are packaged in DO-204AH (DO-35) through-hole axial configuration, matching the original BZX55A8V2-TAP. This ensures mechanical and electrical compatibility with existing PCB layouts and soldering processes. No package adaptation is required.

Q: Does operating temperature range affect substitution suitability?

A: The BZX55A8V2-TAP specifies 175°C maximum operating temperature. BZX55B8V2-TAP, 1N5237B, and 1N5998D maintain this specification with extended lower limits (-65°C). The 1N756A BK PBFREE extends the upper limit to 200°C. For applications operating at or near 175°C, all parts are suitable. For applications requiring operation above 175°C, only 1N756A BK PBFREE is appropriate.

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