BZX55F6V8-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F6V8-TAP is a 6.8 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 through-hole package. This part carries an obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 6.8 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±1%	—
Power - Max	500	mW
Impedance (Max)	8	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 3 V	—
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	—
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX55F6V8-TAP is determined by the following critical parameters:

Zener Voltage (Vz): 6.8 V nominal
Power Dissipation: 500 mW maximum
Package Type: DO-35 through-hole axial configuration
Tolerance: Voltage tolerance range acceptable for the application
Impedance (Zzt): Dynamic impedance characteristics
Reverse Leakage Current: Leakage behavior at specified reverse voltage
Operating Temperature Range: Maximum junction temperature capability
Compliance Standards: RoHS, REACH, and grade certifications

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalents (Vishay BZX55 Series) Parts within the same manufacturer series with identical electrical specifications but different tolerance grades or packaging formats.

Category 2: Cross-Manufacturer Alternatives Parts from alternative manufacturers (Microchip Technology, Central Semiconductor Corp) meeting the same nominal voltage, power rating, and package requirements with variations in tolerance, impedance, and leakage characteristics.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ If	Temp Range (°C)	Status	RoHS
BZX55F6V8-TAP	Vishay	6.8	±1%	500	8	1.5 V @ 200 mA	–65 to 175	Obsolete	ROHS3
BZX55B6V8-TAP	Vishay	6.8	±2%	500	8	1.5 V @ 200 mA	–65 to 175	Active	ROHS3
1N5235B	Microchip Technology	6.8	±5%	500	5	1.5 V @ 200 mA	–65 to 175	Active	Non-compliant
1N5235B TR PBFREE	Central Semiconductor Corp	6.8	±5%	500	5	1.1 V @ 200 mA	–65 to 200	Active	ROHS3
1N5732B	Microchip Technology	6.8	±5%	500	10	900 mV @ 10 mA	–65 to 175	Active	Non-compliant
1N5732C	Microchip Technology	6.8	±1%	500	10	900 mV @ 10 mA	–65 to 175	Active	Non-compliant
1N5996A	Microchip Technology	6.8	±10%	500	25	1.1 V @ 200 mA	–65 to 175	Active	Non-compliant
1N754A TR PBFREE	Central Semiconductor Corp	6.8	±5%	500	5	1.5 V @ 200 mA	–65 to 200	Active	ROHS3
JANTX1N4099C-1	Microchip Technology	6.8	±2%	500	200	1.1 V @ 200 mA	–65 to 175	Active	Non-compliant

Engineering Selection Recommendations

Primary Recommendation: BZX55B6V8-TAP

The BZX55B6V8-TAP is the direct successor within the Vishay BZX55 series. It maintains identical electrical performance (6.8 V, 500 mW, DO-35 package) with ±2% tolerance versus the original ±1%. This part is active in production, ROHS3 compliant, and carries AEC-Q101 automotive qualification matching the original specification. Substitution introduces minimal design risk.

Secondary Recommendation: 1N5235B TR PBFREE

The 1N5235B TR PBFREE from Central Semiconductor Corp is an active, ROHS3-compliant alternative. It provides extended operating temperature range (–65°C to 200°C versus –65°C to 175°C), lower impedance (5 Ohms versus 8 Ohms), and reduced forward voltage (1.1 V versus 1.5 V at 200 mA). Tolerance is ±5%, representing a relaxation from the original ±1% specification. This part is suitable for applications where tighter voltage tolerance is not critical.

Tertiary Recommendation: 1N754A TR PBFREE

The 1N754A TR PBFREE from Central Semiconductor Corp is active and ROHS3 compliant with extended temperature range (–65°C to 200°C). It maintains impedance (5 Ohms) and forward voltage characteristics (1.5 V @ 200 mA) closer to the original part. Tolerance is ±5%. This part is appropriate for designs requiring extended thermal performance.

Military-Grade Alternative: JANTX1N4099C-1

The JANTX1N4099C-1 from Microchip Technology is qualified to MIL-PRF-19500/435 military standard with ±2% tolerance matching the original specification. However, impedance is significantly higher (200 Ohms versus 8 Ohms), which may affect circuit performance in voltage regulation applications. This part is suitable only for military or high-reliability applications where impedance variation is acceptable.

Not Recommended for Direct Substitution:

1N5732B, 1N5732C, 1N5996A: These parts are RoHS non-compliant and lack automotive qualification. Use only in legacy systems where RoHS compliance is not required.
1N5235B (Microchip, non-PBFREE): RoHS non-compliant status disqualifies this part for new designs.

Frequently Asked Questions (FAQ)

Q: Can BZX55B6V8-TAP replace BZX55F6V8-TAP directly?

A: Yes. Both parts are from the Vishay BZX55 series with identical 6.8 V nominal voltage, 500 mW power rating, and DO-35 package. The tolerance difference (±2% versus ±1%) is the only electrical distinction. BZX55B6V8-TAP is active in production and ROHS3 compliant, making it the preferred direct replacement.

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

A: Tolerance defines the acceptable voltage deviation from the 6.8 V nominal specification. The original BZX55F6V8-TAP specifies ±1% (6.732 V to 6.868 V). Substitutes with ±2% (BZX55B6V8-TAP, JANTX1N4099C-1) allow 6.664 V to 6.936 V. Substitutes with ±5% (1N5235B, 1N5235B TR PBFREE, 1N754A TR PBFREE) allow 6.46 V to 7.14 V. Applications requiring precise voltage regulation must account for this expanded tolerance range.

Q: Why do some substitutes have higher impedance values?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode at the specified operating point. Higher impedance (e.g., 25 Ohms for 1N5996A, 200 Ohms for JANTX1N4099C-1) results in greater voltage variation with changes in current. Applications sensitive to voltage ripple or requiring low output impedance should prioritize substitutes with lower impedance values (5 Ohms for 1N5235B, 1N5235B TR PBFREE, 1N754A TR PBFREE).

Q: Are all substitute parts available in the same DO-35 package?

A: Yes. All listed substitute parts are specified for DO-35 through-hole axial package (also designated DO-204AH). Physical dimensions and lead configuration are compatible with the original BZX55F6V8-TAP, allowing direct PCB mounting without layout modifications.

Q: What is the difference between PBFREE and non-PBFREE variants?

A: PBFREE designation indicates lead-free solder compatibility. Parts marked "TR PBFREE" (1N5235B TR PBFREE, 1N754A TR PBFREE) are manufactured without lead and are compatible with RoHS3-compliant assembly processes. Non-PBFREE variants may contain lead and are restricted in certain applications or regions.

Q: Can JANTX1N4099C-1 be used in automotive applications?

A: JANTX1N4099C-1 is qualified to military standard MIL-PRF-19500/435, not automotive standard AEC-Q101. While the part meets electrical specifications, it lacks automotive qualification. Use in automotive applications requires verification that military qualification is acceptable for the specific application context.

Q: What is the significance of operating temperature range differences?

A: The original BZX55F6V8-TAP specifies maximum operating temperature of 175°C. Substitutes with extended range (1N5235B TR PBFREE and 1N754A TR PBFREE extend to 200°C) provide additional thermal margin. This is beneficial in high-temperature environments but does not affect performance in standard operating conditions (–65°C to 175°C).

Q: Why is RoHS compliance important for substitute selection?

A: ROHS3 compliance is mandatory for products sold in the European Union and increasingly required globally. ROHS3-compliant parts (BZX55B6V8-TAP, 1N5235B TR PBFREE, 1N754A TR PBFREE) are manufactured without restricted substances. Non-compliant parts (1N5235B, 1N5732B, 1N5732C, 1N5996A, JANTX1N4099C-1) are restricted for new designs unless legacy system support is required.

Q: How does reverse leakage current affect circuit performance?

A: Reverse leakage current determines the minimum load current required to maintain Zener regulation. The original part specifies 100 nA @ 3 V. Substitutes with higher leakage (e.g., 3 µA @ 5 V for 1N5235B, 1N5235B TR PBFREE) require higher minimum load current. Applications with very light load conditions should prioritize parts with lower leakage specifications.

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