BZX84C4V3 Equivalent & Substitute Parts

Part Overview

The BZX84C4V3 is a surface mount Zener diode manufactured by onsemi with a nominal Zener voltage of 4.3 V and maximum power dissipation of 350 mW in a SOT-23-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The BZX84C4V3 serves voltage regulation and protection applications requiring precise 4.3 V reference characteristics in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±7%	—
Power - Max	350	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 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 BZX84C4V3 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 4.3 V (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical and electrical compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Impedance (Max): 90 Ohms (electrical performance)

Secondary Compatibility Factors:

Power - Max: 350 mW or greater (functional equivalence)
Tolerance: ±7% or tighter (voltage regulation accuracy)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (forward bias characteristics)
Current - Reverse Leakage @ Vr: 5 µA @ 1 V or lower (leakage performance)
Operating Temperature: -55°C to 150°C or wider range (thermal compatibility)

Substitute parts meeting all primary criteria and maintaining or exceeding secondary parameter specifications are electrically and mechanically interchangeable with the BZX84C4V3.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Vf Max @ If (mV @ mA)	Temp Range (°C)	Package	Status
BZX84C4V3	onsemi	4.3	±7%	350	90	900 @ 10	-55 to 150	SOT-23-3	Obsolete
BZX84C4V3LT1G	onsemi	4.3	±7%	225	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84C4V3LT3G	onsemi	4.3	±7%	225	90	900 @ 10	-65 to 150	SOT-23-3	Active
SZBZX84C4V3LT1G	onsemi	4.3	±7%	225	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84-A4V3,215	NXP Semiconductors	4.3	±1%	250	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84-C4V3,215	NXP USA Inc.	4.3	±5%	250	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84-C4V3,235	Nexperia USA Inc.	4.3	±5%	250	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84B4V3-TP	Micro Commercial Co	4.3	±2%	350	90	900 @ 10	-55 to 150	SOT-23-3	Active
BZX84C4V3 TR PBFREE	Central Semiconductor Corp	4.3	±5%	350	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84C4V3-7-F	Diodes Incorporated	4.3	±7%	300	90	900 @ 10	-65 to 150	SOT-23-3	Active
BZX84C4V3_R1_00001	Panjit International Inc.	4.3	±5%	410	90	—	-55 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BZX84B4V3-TP and BZX84C4V3 TR PBFREE are direct functional equivalents to the obsolete BZX84C4V3. Both maintain the 4.3 V nominal Zener voltage, 350 mW power rating, SOT-23-3 package, and 90 Ohm impedance specification. BZX84B4V3-TP is manufactured by Micro Commercial Co and is currently active. BZX84C4V3 TR PBFREE is manufactured by Central Semiconductor Corp and is RoHS3 compliant with active product status.

onsemi Active Alternatives:

BZX84C4V3LT1G and BZX84C4V3LT3G are active onsemi products maintaining the same manufacturer lineage as the obsolete part. Both feature identical 4.3 V Zener voltage, ±7% tolerance, and SOT-23-3 package. Power dissipation is reduced to 225 mW, which is acceptable for applications not requiring the full 350 mW capability. Operating temperature range extends to -65°C, providing improved low-temperature performance. SZBZX84C4V3LT1G is an automotive-qualified variant (AEC-Q101) from onsemi with identical electrical specifications.

NXP Semiconductors Options:

BZX84-A4V3,215 and BZX84-C4V3,215 are NXP products with active status and automotive qualification (AEC-Q101). Both maintain 4.3 V Zener voltage and 250 mW power rating. BZX84-A4V3,215 offers superior tolerance at ±1%, while BZX84-C4V3,215 provides ±5% tolerance. Both support the full -65°C to 150°C operating range.

Alternative Manufacturers:

BZX84C4V3-7-F (Diodes Incorporated) and BZX84C4V3_R1_00001 (Panjit International Inc.) provide additional sourcing options. BZX84C4V3-7-F maintains ±7% tolerance with 300 mW power rating and extended temperature range. BZX84C4V3_R1_00001 offers the highest power dissipation at 410 mW with ±5% tolerance.

Compliance Considerations:

All active substitute parts listed maintain REACH Unaffected status and EAR99 ECCN classification. Multiple substitutes are RoHS3 compliant. Automotive-qualified variants (SZBZX84C4V3LT1G, BZX84-A4V3,215, BZX84-C4V3,215) carry AEC-Q101 qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can BZX84C4V3LT1G replace the obsolete BZX84C4V3 directly?

A: Yes. BZX84C4V3LT1G is electrically and mechanically compatible. Both share identical 4.3 V Zener voltage, ±7% tolerance, 90 Ohm impedance, and SOT-23-3 package. The primary difference is reduced power dissipation (225 mW vs. 350 mW) and extended operating temperature range (-65°C to 150°C vs. -55°C to 150°C). Direct substitution is valid for applications within the 225 mW power budget.

Q: What is the difference between BZX84C4V3LT1G and BZX84C4V3LT3G?

A: Both parts are electrically identical with 4.3 V Zener voltage, ±7% tolerance, 225 mW power rating, and SOT-23-3 package. The difference is packaging format: BZX84C4V3LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while BZX84C4V3LT3G is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements.

Q: Is SZBZX84C4V3LT1G suitable for automotive applications?

A: Yes. SZBZX84C4V3LT1G carries AEC-Q101 automotive qualification and is designated as automotive-grade. It maintains 4.3 V Zener voltage, ±7% tolerance, 225 mW power rating, and SOT-23-3 package. This part is appropriate for automotive circuit protection and voltage regulation applications.

Q: How do NXP BZX84-A4V3,215 and BZX84-C4V3,215 compare to the original BZX84C4V3?

A: Both NXP parts maintain 4.3 V Zener voltage, 250 mW power rating, and SOT-23-3 package. BZX84-A4V3,215 offers tighter tolerance (±1% vs. ±7%) and is automotive-qualified. BZX84-C4V3,215 provides ±5% tolerance and automotive qualification. Both support -65°C to 150°C operating range, exceeding the original -55°C to 150°C specification.

Q: Can I use BZX84C4V3-7-F as a substitute?

A: Yes. BZX84C4V3-7-F (Diodes Incorporated) maintains 4.3 V Zener voltage, ±7% tolerance, and SOT-23-3 package. Power dissipation is 300 mW, which is lower than the original 350 mW but higher than the onsemi LT1G variants. Operating temperature range is -65°C to 150°C. This part is suitable for applications within the 300 mW power budget.

Q: What is the highest power-rated substitute available?

A: BZX84C4V3_R1_00001 (Panjit International Inc.) offers the highest power dissipation at 410 mW while maintaining 4.3 V Zener voltage and SOT-23-3 package. This part is suitable for applications requiring maximum power handling capability within the same package form factor.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are RoHS3 compliant. Specifically, BZX84C4V3LT1G, BZX84C4V3LT3G, BZX84-C4V3,235, BZX84C4V3 TR PBFREE, BZX84C4V3-7-F, and BZX84C4V3_R1_00001 are confirmed RoHS3 compliant. Verify RoHS status with the specific manufacturer for your selected part.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel (BZX84C4V3LT1G), Tape & Reel (TR) (BZX84C4V3LT3G, SZBZX84C4V3LT1G, BZX84-C4V3,235, BZX84C4V3-7-F, BZX84C4V3_R1_00001), and Bulk (BZX84-A4V3,215, BZX84-C4V3,215, BZX84B4V3-TP). Select packaging based on assembly line requirements and order quantities.

Q: Can I substitute a part with lower power rating?

A: Substitution with lower power rating is valid only if the application circuit operates within the reduced power budget. For example, BZX84C4V3LT1G (225 mW) can replace BZX84C4V3 (350 mW) if the circuit dissipates less than 225 mW. Verify power dissipation calculations before selecting a lower-rated substitute.

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