BZX84C6V8 Equivalent & Substitute Parts

Part Overview

The BZX84C6V8 is a surface-mount Zener diode manufactured by onsemi with a nominal Zener voltage of 6.8 V and maximum power dissipation of 350 mW in a SOT-23-3 package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical specifications, while substitute parts offer compatible performance within defined parameter tolerances for the 6.8 V Zener diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±6%	-
Power - Max	350	mW
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	2	µA @ 4 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-

Substitute Part Grouping Explanation

Substitution of the BZX84C6V8 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 6.8 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Impedance (Max): 15 Ohms or lower
Forward voltage: 900 mV @ 10 mA maximum

Secondary Compatibility Factors:

Power dissipation: 225 mW minimum (lower power variants acceptable for reduced thermal load applications)
Tolerance: ±2% to ±6% acceptable
Operating temperature range: -55°C to -65°C minimum, 150°C maximum
Reverse leakage current: 2 µA to 3 µA @ specified voltage

Substitute parts are grouped into three categories: direct equivalents (identical electrical specifications), active alternatives (same voltage and package with minor parameter variations), and upgraded variants (enhanced power ratings or tighter tolerances).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Temp Range (°C)	Product Status	Package
BZX84C6V8	onsemi	6.8	±6%	350	15	900	-55 to 150	Obsolete	SOT-23-3
BZX84C6V8LT1G	onsemi	6.8	±6%	225	15	900	-65 to 150	Active	SOT-23-3
BZX84C6V8LT3G	onsemi	6.8	±6%	225	15	900	-65 to 150	Active	SOT-23-3
SZBZX84C6V8LT1G	onsemi	6.8	±6%	225	15	900	-65 to 150	Active	SOT-23-3
BZX84C6V8 TR PBFREE	Central Semiconductor Corp	6.8	±5%	350	15	900	-65 to 150	Active	SOT-23
BZX84C6V8-7-F	Diodes Incorporated	6.8	±6%	300	15	900	-65 to 150	Active	SOT-23-3
BZX84-C6V8,215	Nexperia USA Inc.	6.8	±5%	250	15	900	-65 to 150	Active	TO-236AB
BZX84-C6V8,235	NXP Semiconductors	6.8	±5%	250	15	900	-65 to 150	Active	TO-236AB
BZX84B6V8-TP	Micro Commercial Co	6.8	±2%	350	15	900	-55 to 150	Active	SOT-23
CMPZ5235B BK PBFREE	Central Semiconductor Corp	6.8	±5%	350	5	900	-65 to 150	Active	SOT-23
CMPZ5235B TR PBFREE	Central Semiconductor Corp	6.8	±5%	350	5	900	-65 to 150	Active	SOT-23

Engineering Selection Recommendations

Direct Equivalents (onsemi Active Alternatives): BZX84C6V8LT1G and BZX84C6V8LT3G are active onsemi products with identical electrical specifications to the obsolete BZX84C6V8, differing only in packaging format (Cut Tape vs. Tape & Reel) and extended lower operating temperature limit (-65°C vs. -55°C). These parts are ROHS3 compliant and recommended for direct replacement in new designs.

Upgraded Power Rating Options: BZX84C6V8 TR PBFREE (Central Semiconductor Corp) and BZX84B6V8-TP (Micro Commercial Co) maintain the 350 mW power rating of the original part while offering active product status and ROHS3 compliance. BZX84B6V8-TP provides tighter tolerance (±2%) at the cost of narrower operating temperature range (-55°C to 150°C).

Automotive-Qualified Alternatives: SZBZX84C6V8LT1G (onsemi) and BZX84-C6V8,215 (Nexperia USA Inc.) carry AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components. Both maintain 6.8 V specification with extended temperature range (-65°C to 150°C).

Lower Impedance Variants: CMPZ5235B TR PBFREE and CMPZ5235B BK PBFREE (Central Semiconductor Corp) offer reduced impedance (5 Ohms vs. 15 Ohms) with 350 mW power rating, providing improved voltage regulation characteristics for precision applications.

Selection Basis: All recommended substitutes maintain identical Zener voltage (6.8 V), forward voltage characteristics (900 mV @ 10 mA), and SOT-23 package compatibility. Selection should prioritize active product status, required compliance certifications (ROHS3, AEC-Q101), and specific packaging requirements (bulk, tape & reel, or cut tape).

Frequently Asked Questions (FAQ)

Q: Can BZX84C6V8LT1G and BZX84C6V8LT3G be used interchangeably with the obsolete BZX84C6V8?

A: Yes. Both parts are active onsemi products with identical Zener voltage (6.8 V), tolerance (±6%), impedance (15 Ohms), and forward voltage characteristics (900 mV @ 10 mA). The primary differences are packaging format and extended lower operating temperature (-65°C vs. -55°C). Electrical performance in circuit operation is equivalent.

Q: What is the difference between BZX84C6V8 TR PBFREE and CMPZ5235B TR PBFREE?

A: Both parts maintain 6.8 V Zener voltage and 350 mW power rating in SOT-23 package. CMPZ5235B TR PBFREE offers lower impedance (5 Ohms vs. 15 Ohms), resulting in improved voltage regulation and reduced dynamic resistance. This makes CMPZ5235B TR PBFREE suitable for applications requiring tighter voltage stability. Reverse leakage current is slightly higher (3 µA @ 5 V vs. 2 µA @ 4 V).

Q: Are Nexperia BZX84-C6V8,215 and NXP BZX84-C6V8,235 suitable replacements?

A: Yes. Both parts provide 6.8 V Zener voltage with 250 mW power rating in TO-236AB package. They carry AEC-Q101 automotive qualification and ROHS3 compliance. The reduced power rating (250 mW vs. 350 mW) is acceptable for applications not requiring maximum thermal dissipation. Tolerance is tighter (±5% vs. ±6%).

Q: What is the significance of the SZBZX84C6V8LT1G designation?

A: The "SZ" prefix indicates automotive-grade qualification (AEC-Q101). SZBZX84C6V8LT1G is an onsemi product suitable for automotive applications requiring qualified components. Electrical specifications match BZX84C6V8LT1G with extended operating temperature range (-65°C to 150°C).

Q: Can lower power variants (225 mW) replace the 350 mW original part?

A: Lower power variants (BZX84C6V8LT1G, BZX84C6V8LT3G, SZBZX84C6V8LT1G at 225 mW) are suitable for applications where thermal dissipation requirements do not exceed 225 mW. These parts maintain identical Zener voltage and impedance characteristics. Circuit design must confirm that maximum power dissipation does not exceed the lower rating.

Q: What packaging options are available for 6.8 V Zener diodes?

A: All substitute parts are available in SOT-23-3 or TO-236AB surface-mount packages. Packaging formats include Tape & Reel (TR), Cut Tape (CT), Digi-Reel, and Bulk. Selection depends on production volume and assembly requirements. Electrical specifications remain identical across packaging formats.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The obsolete BZX84C6V8 does not carry ROHS3 designation. ROHS3 compliance is standard for all active alternatives and should be verified during component procurement.

Q: What is the difference between ±2%, ±5%, and ±6% tolerance specifications?

A: Tolerance indicates the allowable deviation from nominal Zener voltage. BZX84B6V8-TP (±2%) provides the tightest voltage accuracy, suitable for precision regulation applications. BZX84C6V8 and BZX84C6V8LT1G (±6%) allow wider deviation. Selection depends on circuit voltage regulation requirements and acceptable voltage variation.

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