BZX55F8V2-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F8V2-TAP is a Zener diode rated at 8.2 V nominal voltage with 500 mW power dissipation and ±1% tolerance, manufactured by Vishay General Semiconductor - Diodes Division. This component is packaged in DO-35 (DO-204AH) axial through-hole configuration and qualified to AEC-Q101 automotive standards. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±1%	—
Power - Max	500	mW
Impedance (Max)	7	Ohms
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature	175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX55F8V2-TAP is determined by the following critical parameters:

Primary Matching Criteria:

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

Secondary Compatibility Factors:

Voltage tolerance (±1% preferred, ±2% to ±5% acceptable with application review)
Impedance characteristics (7 Ohms nominal for BZX55F8V2-TAP)
Forward voltage characteristics
Reverse leakage current specifications
Operating temperature range

Substitute parts are grouped into two categories: Direct Equivalents (same manufacturer series with minor tolerance variation) and Cross-Manufacturer Alternatives (functionally equivalent from different manufacturers with comparable electrical performance).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ If (V @ mA)	Temp Range (°C)	Status
BZX55F8V2-TAP	Vishay	8.2	±1%	500	7	1.5 @ 200	–65 to 175	Obsolete
BZX55B8V2-TAP	Vishay	8.2	±2%	500	7	1.5 @ 200	–65 to 175	Active
1N3516A	Microchip Technology	8.2	±5%	500	5	1.1 @ 200	–65 to 175	Active
1N5237B	Microchip Technology	8.2	±5%	500	8	1.5 @ 200	–65 to 175	Active
1N5734D	Microchip Technology	8.2	±1%	500	15	0.9 @ 10	–65 to 175	Active
1N5998A	Microchip Technology	8.2	±10%	500	15	1.1 @ 200	–65 to 175	Active
1N5998C	Microchip Technology	8.2	±2%	500	7	1.1 @ 200	–65 to 175	Active
1N5998D	Microchip Technology	8.2	±1%	500	7	1.1 @ 200	–65 to 175	Active
1N756A TR PBFREE	Central Semiconductor Corp	8.2	±5%	500	8	1.5 @ 200	–65 to 200	Active
BZX79C8V2	Taiwan Semiconductor Corporation	8.2	±5%	500	15	1.5 @ 100	–65 to 175	Active
BZX79C8V2-T50A	Fairchild Semiconductor	8.2	±5%	500	15	1.5 @ 100	–65 to 200	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred):

BZX55B8V2-TAP from Vishay General Semiconductor - Diodes Division is the primary substitute. This part maintains the same manufacturer lineage (BZX55 series), identical power rating (500 mW), matching impedance (7 Ohms), and equivalent forward voltage characteristics. The tolerance specification increases from ±1% to ±2%, which remains within acceptable margins for most applications. The part is active with substantial inventory availability (20,479 units) and carries identical AEC-Q101 automotive qualification and ROHS3 compliance as the original.

Active Alternatives with ±1% Tolerance Match:

1N5734D and 1N5998D from Microchip Technology both provide ±1% tolerance matching the original specification. Both are active components with adequate inventory. 1N5998D offers superior impedance matching (7 Ohms) and lower forward voltage (1.1 V @ 200 mA) compared to 1N5734D (15 Ohms, 0.9 V @ 10 mA). However, both parts are RoHS non-compliant, which may restrict use in applications requiring ROHS3 certification.

Broader Tolerance Alternatives:

1N5237B, 1N3516A, 1N756A TR PBFREE, BZX79C8V2, and BZX79C8V2-T50A provide functional equivalence with ±5% tolerance. 1N756A TR PBFREE from Central Semiconductor Corp offers extended operating temperature range (–65°C to 200°C) and ROHS3 compliance. BZX79C8V2-T50A from Fairchild Semiconductor provides the highest inventory availability (50,865 units) and extended temperature range (–65°C to 200°C).

Compliance Considerations:

For applications requiring automotive qualification and ROHS3 compliance, BZX55B8V2-TAP and 1N756A TR PBFREE are the only active substitutes meeting both criteria. Applications without these restrictions benefit from broader component availability through Microchip Technology alternatives.

Frequently Asked Questions (FAQ)

Q: Can BZX55B8V2-TAP directly replace BZX55F8V2-TAP?

A: Yes. BZX55B8V2-TAP is the direct successor within the Vishay BZX55 series. The tolerance change from ±1% to ±2% represents the only specification difference. Both parts share identical voltage rating (8.2 V), power dissipation (500 mW), impedance (7 Ohms), and package configuration (DO-35 axial through-hole). AEC-Q101 qualification and ROHS3 compliance are maintained.

Q: What is the significance of impedance (Zzt) differences among substitute parts?

A: Impedance affects voltage regulation characteristics under varying load conditions. The original BZX55F8V2-TAP specifies 7 Ohms maximum impedance. Substitutes with higher impedance values (15 Ohms in 1N5734D, 1N5998A, BZX79C8V2, BZX79C8V2-T50A) exhibit greater voltage variation across the operating current range. Lower impedance (5 Ohms in 1N3516A) provides tighter voltage regulation. Selection depends on circuit requirements for voltage stability.

Q: Are RoHS non-compliant parts acceptable substitutes?

A: RoHS compliance is application-dependent. Parts such as 1N3516A, 1N5237B, 1N5734D, 1N5998A, 1N5998C, and 1N5998D are RoHS non-compliant. These components are suitable for applications without RoHS requirements. For applications requiring ROHS3 certification, use BZX55B8V2-TAP, 1N756A TR PBFREE, BZX79C8V2, or BZX79C8V2-T50A.

Q: Does tolerance specification affect circuit performance?

A: Tolerance determines the acceptable range of zener voltage around the 8.2 V nominal value. ±1% tolerance (BZX55F8V2-TAP, 1N5734D, 1N5998D) restricts variation to 8.118–8.282 V. ±2% tolerance (BZX55B8V2-TAP, 1N5998C) allows 8.036–8.364 V. ±5% tolerance (1N3516A, 1N5237B, 1N756A TR PBFREE, BZX79C8V2, BZX79C8V2-T50A) permits 7.79–8.41 V. Applications with strict voltage regulation requirements necessitate tighter tolerance specifications.

Q: Can parts with different operating temperature ranges be substituted?

A: Operating temperature range substitution is valid only when the application operates within the narrower range. The original BZX55F8V2-TAP specifies maximum 175°C. Substitutes with identical range (BZX55B8V2-TAP, 1N3516A, 1N5237B, 1N5734D, 1N5998A, 1N5998C, 1N5998D, BZX79C8V2) are directly compatible. Parts with extended range (1N756A TR PBFREE, BZX79C8V2-T50A to 200°C) provide additional thermal margin without performance degradation.

Q: What packaging considerations apply to these substitutes?

A: All listed substitutes maintain DO-35 (DO-204AH) axial through-hole package configuration, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes. Packaging variations (Cut Tape, Bulk, Tape & Reel) affect supply chain logistics but do not impact component functionality or board-level performance.

Q: Which substitute offers the best inventory availability?

A: BZX79C8V2-T50A from Fairchild Semiconductor provides the highest inventory availability at 50,865 units. BZX55B8V2-TAP (20,479 units) and 1N756A TR PBFREE (10,690 units) offer substantial stock levels. For applications requiring immediate availability, these three options are preferred.

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