BZX85C6V2 Equivalent & Substitute Parts

Part Overview

The BZX85C6V2 is a through-hole zener diode rated at 6.2 V nominal voltage with 1 W maximum power dissipation, manufactured by onsemi in the DO-204AL (DO-41) axial package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.2	V
Tolerance	±6%	—
Power - Max	1	W
Impedance (Max)	4	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the BZX85C6V2 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 6.2 V nominal (determines circuit regulation point)
Power rating: Minimum 1 W (determines thermal capability)
Package type: DO-204AL / DO-41 axial (determines mechanical fit and lead configuration)
Mounting type: Through hole (determines PCB assembly compatibility)
Operating temperature range: Must encompass application requirements

Secondary Compatibility Parameters:

Voltage tolerance: ±5% to ±6% acceptable (affects voltage regulation accuracy)
Impedance: 2 to 4 Ohms (affects dynamic response characteristics)
Reverse leakage current: 1 to 10 µA @ specified voltage (affects standby performance)
Forward voltage: 1.2 to 1.5 V @ 200 mA (affects forward conduction characteristics)

Substitute parts are grouped into three categories based on power rating alignment: 1 W rated devices (direct substitutes), 500 mW rated devices (reduced power capability), and 3 W rated devices (enhanced power capability). Parts meeting the 6.2 V zener voltage, DO-41 package, and through-hole mounting requirements are considered functionally compatible within their respective power classes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Reverse Leakage (µA)	Vf (V)	Temp Range (°C)	Package	Product Status
BZX85C6V2	onsemi	6.2	±6%	1	4	1 @ 3V	1.2 @ 200mA	-65 to 200	DO-41	Obsolete
1N4735A	Lumimax Optoelectronic Technology	6.2	±5%	1	2	10 @ 3V	1.2 @ 200mA	-65 to 200	DO-41G	Active
1N5234B	Microchip Technology	6.2	±5%	0.5	7	5 @ 4V	1.5 @ 200mA	-65 to 175	DO-35	Active
1N5920BRLG	onsemi	6.2	±5%	3	2	5 @ 4V	1.5 @ 200mA	-65 to 200	Axial	Active
BZX85C6V2-TAP	Vishay General Semiconductor - Diodes Division	6.2	±5%	1.3	4	1 @ 3V	—	-55 to 175	DO-41	Active
1N4627-1	Microchip Technology	6.2	±5%	0.5	1200	1 @ 5.7V	1.1 @ 200mA	-65 to 175	DO-7	Active
1N4735 G	Microsemi Corporation	6.2	±10%	1	2	10 @ 3V	1.2 @ 200mA	-65 to 175	DO-41	Active
1N4735A G	Microsemi Corporation	6.2	±5%	1	2	10 @ 3V	1.2 @ 200mA	-65 to 175	DO-41	Active
1N4735AE3/TR13	Microchip Technology	6.2	±5%	1	2	10 @ 3V	1.2 @ 200mA	-65 to 150	DO-41	Active
1N4735AP/TR12	Microchip Technology	6.2	±5%	1	2	10 @ 3V	1.2 @ 200mA	-65 to 150	DO-41	Active
1N4735AP/TR8	Microchip Technology	6.2	±5%	1	2	10 @ 3V	1.2 @ 200mA	-65 to 150	DO-41	Active

Engineering Selection Recommendations

Direct Substitutes (1 W Power Rating, DO-41 Package):

The BZX85C6V2-TAP manufactured by Vishay General Semiconductor is the closest direct substitute. It maintains the 6.2 V zener voltage, 1 W power rating, DO-41 package configuration, and equivalent impedance (4 Ohms). The part carries AEC-Q101 automotive qualification and ROHS3 compliance. Operating temperature range is -55°C to 175°C, which is narrower than the original -65°C to 200°C specification. This part is suitable for applications where the reduced upper temperature limit is acceptable.

The 1N4735A series from Lumimax Optoelectronic Technology, Microsemi Corporation (1N4735A G), and Microchip Technology (1N4735AE3/TR13, 1N4735AP/TR12, 1N4735AP/TR8) all provide 6.2 V, 1 W zener diodes in DO-41 packages with active product status. These parts feature ±5% voltage tolerance (tighter than the original ±6%) and lower impedance (2 Ohms). Microchip variants carry ROHS3 compliance. Operating temperature ranges vary: Lumimax extends to 200°C, while Microchip and Microsemi variants are limited to 150°C or 175°C. The 1N4735 G from Microsemi carries ±10% tolerance, which is wider than the original specification.

Enhanced Power Rating Substitute (3 W Power Rating):

The 1N5920BRLG manufactured by onsemi provides 6.2 V zener voltage with 3 W power rating in an axial package. This part is suitable for applications requiring higher power dissipation capability while maintaining the same zener voltage and operating temperature range (-65°C to 200°C). ROHS3 compliance is provided. This part is appropriate for designs where thermal margin or power handling must be increased.

Reduced Power Rating Substitutes (500 mW Power Rating):

The 1N5234B from Microchip Technology and 1N4627-1 from Microchip Technology both provide 6.2 V zener voltage with 500 mW power rating. The 1N5234B uses a DO-35 package (different from DO-41), while 1N4627-1 uses a DO-7 package. These parts are suitable only for applications where the reduced power dissipation is acceptable and the package change does not create mechanical or assembly constraints. The 1N4627-1 exhibits significantly higher impedance (1200 Ohms), which affects dynamic response characteristics.

Compliance and Regulatory Status:

All active substitute parts maintain REACH Unaffected and EAR99 ECCN classifications consistent with the original part. RoHS compliance varies: Lumimax 1N4735A, onsemi 1N5920BRLG, Microchip 1N4735AE3/TR13, and Microchip 1N4735AP/TR8 are ROHS3 compliant. Microsemi and other Microchip variants are RoHS non-compliant. Selection should account for end-product RoHS requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N5920BRLG (3 W) be used as a direct replacement for the BZX85C6V2 (1 W)?

A: Yes, the 1N5920BRLG is functionally compatible. It maintains the 6.2 V zener voltage, through-hole axial mounting, and -65°C to 200°C operating temperature range. The higher 3 W power rating provides additional thermal margin and does not degrade circuit performance. Selection of this part is appropriate when enhanced power dissipation capability is beneficial or required.

Q: What is the impact of using a 500 mW zener diode (1N5234B or 1N4627-1) in place of the 1 W BZX85C6V2?

A: The 500 mW power rating is half that of the original specification. This substitution is only acceptable if the application's actual power dissipation does not exceed 500 mW. Exceeding this limit results in thermal stress and potential device failure. Additionally, the 1N5234B uses a DO-35 package and the 1N4627-1 uses a DO-7 package, both different from the original DO-41, requiring PCB layout modification. The 1N4627-1 exhibits 1200 Ohms impedance, significantly higher than the original 4 Ohms, affecting circuit dynamic response.

Q: Are there differences in voltage tolerance between the BZX85C6V2 and its substitutes?

A: Yes. The original BZX85C6V2 specifies ±6% tolerance. Most active substitutes (1N4735A variants, 1N5920BRLG, 1N5234B, 1N4627-1) provide ±5% tolerance, which is tighter and generally favorable. The 1N4735 G from Microsemi specifies ±10% tolerance, which is wider and may not be suitable for applications requiring the original ±6% specification.

Q: What is the significance of the impedance (Zzt) parameter in zener diode substitution?

A: Impedance affects the zener diode's dynamic response to load current changes. Lower impedance (2 Ohms in 1N4735A variants) provides better voltage regulation under transient conditions compared to higher impedance (4 Ohms in BZX85C6V2 and BZX85C6V2-TAP). The 1N4627-1 with 1200 Ohms impedance exhibits poor dynamic regulation and is suitable only for low-frequency or DC applications. Impedance selection depends on circuit bandwidth and transient response requirements.

Q: Does the operating temperature range difference affect substitution suitability?

A: Yes. The original BZX85C6V2 operates from -65°C to 200°C. The BZX85C6V2-TAP is limited to -55°C to 175°C, and Microchip 1N4735 variants are limited to -65°C to 150°C. If the application requires operation at temperatures above 175°C or below -55°C, these substitutes are not suitable. Conversely, if the application operates within -55°C to 150°C, the narrower range does not present a constraint.

Q: What is the difference between the 1N4735A from Lumimax and the 1N4735A from Microsemi?

A: Both maintain 6.2 V zener voltage and 1 W power rating in DO-41 packages. The Lumimax part operates from -65°C to 200°C (matching the original), while the Microsemi variant operates from -65°C to 175°C. The Lumimax part is not listed with RoHS compliance status, while Microsemi 1N4735A G is RoHS non-compliant. For applications requiring the full -65°C to 200°C range, the Lumimax part is preferred.

Q: Can the BZX85C6V2-TAP be used in applications requiring AEC-Q101 automotive qualification?

A: Yes. The BZX85C6V2-TAP carries AEC-Q101 qualification and ROHS3 compliance, making it suitable for automotive applications. The original BZX85C6V2 does not list automotive qualification. If automotive-grade components are required, the BZX85C6V2-TAP is the appropriate choice among the available substitutes.

Q: What packaging formats are available for 6.2 V, 1 W zener diodes?

A: The primary packaging for 1 W zener diodes is DO-204AL (DO-41) axial, used by BZX85C6V2, BZX85C6V2-TAP, 1N4735A variants, and 1N4735 G variants. The 1N5920BRLG is also available in axial format. Reduced power variants use different packages: 1N5234B uses DO-35 (DO-204AH), and 1N4627-1 uses DO-7 (DO-204AA). Package selection affects PCB layout and assembly compatibility.

Q: Is the BZX85C6V2 still available for purchase despite being classified as obsolete?

A: The original BZX85C6V2 is listed as obsolete and is no longer manufactured by onsemi. However, inventory of 2000 pieces is reported as available from current stock. Once existing inventory is depleted, the part will no longer be available. Active substitutes should be qualified and adopted to ensure long-term supply chain continuity.

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