BZX84C3V3 Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX84C3V3 is a 3.3 V Zener diode manufactured by onsemi, rated for 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The BZX84C3V3 serves voltage regulation and protection functions in electronic circuits requiring a 3.3 V reference or clamping voltage.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±6%	—
Power - Max	350	mW
Impedance (Max)	95	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 BZX84C3V3 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage: 3.3 V nominal
Tolerance: ±6% or tighter
Maximum power dissipation: 350 mW or greater
Impedance (Max): 95 Ohms or lower
Reverse leakage current: 5 µA @ 1 V or lower
Forward voltage: 900 mV @ 10 mA or lower
Operating temperature range: must encompass -55°C to 150°C or be compatible with application requirements

Mechanical Compatibility Requirements:

Package: TO-236-3, SC-59, or SOT-23-3
Mounting type: Surface Mount

Compliance Requirements:

RoHS compliance preferred for new designs
Moisture Sensitivity Level (MSL): 1 (Unlimited) preferred

Substitute parts are grouped into three categories: direct equivalents (matching all parameters), similar alternatives (meeting electrical requirements with minor parameter variations), and upgrades (enhanced specifications suitable for the same application).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Temp Range (°C)	Product Status	RoHS
BZX84C3V3	onsemi	3.3	±6%	350	95	-55 to 150	Obsolete	—
BZX84C3V3LT1G	onsemi	3.3	±6%	250	95	-65 to 150	Active	ROHS3
SZBZX84C3V3LT1G	onsemi	3.3	±6%	225	95	-65 to 150	Active	ROHS3
SZBZX84C3V3LT3G	onsemi	3.3	±6%	225	95	-65 to 150	Active	ROHS3
BZX84C3V3-7-F	Diodes Incorporated	3.3	±6%	300	95	-65 to 150	Active	ROHS3
BZX84-A3V3,215	NXP Semiconductors	3.3	±1%	250	95	-65 to 150	Active	—
BZX84-C3V3,215	Nexperia USA Inc.	3.3	±5%	250	95	-65 to 150	Active	ROHS3
BZX84-C3V3,235	Nexperia USA Inc.	3.3	±5%	250	95	-65 to 150	Active	ROHS3
BZX84B3V3-TP	Micro Commercial Co	3.3	±2%	350	95	-55 to 150	Active	—
BZX84C3V3 TR	Central Semiconductor Corp	3.3	±5%	350	95	-65 to 150	Active	ROHS3
BZX84C3V3-TP	Micro Commercial Co	3.3	±5%	350	83	-55 to 150	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Preferred for Obsolete Part Replacement):

BZX84C3V3-TP (Micro Commercial Co) is the primary direct equivalent. It maintains the 350 mW power rating, ±5% tolerance, and -55°C to 150°C operating range of the original BZX84C3V3. This part is active and RoHS3 compliant, making it suitable for new production and legacy system support.

BZX84C3V3 TR (Central Semiconductor Corp) provides identical electrical specifications with extended temperature range (-65°C to 150°C) and RoHS3 compliance. This part is recommended when enhanced temperature performance is required.

Active Alternatives with Reduced Power Rating:

BZX84C3V3LT1G (onsemi) is an active onsemi product with identical electrical characteristics but reduced power rating (250 mW). This part is suitable for applications where the full 350 mW dissipation is not required. Extended temperature range (-65°C to 150°C) and RoHS3 compliance are provided.

BZX84-C3V3,215 and BZX84-C3V3,235 (Nexperia USA Inc.) are active alternatives with 250 mW power rating, ±5% tolerance, and -65°C to 150°C operating range. Both are RoHS3 compliant. These parts differ only in packaging format (Cut Tape vs. Tape & Reel).

Automotive-Grade Alternatives:

SZBZX84C3V3LT1G and SZBZX84C3V3LT3G (onsemi) are automotive-grade parts with AEC-Q101 qualification. Both provide 225 mW power rating, ±6% tolerance, and -65°C to 150°C operating range. These parts are suitable for automotive applications requiring qualified components.

Enhanced Performance Option:

BZX84C3V3-7-F (Diodes Incorporated) offers 300 mW power rating with automotive-grade qualification (AEC-Q101) and RoHS3 compliance. Operating temperature range is -65°C to 150°C. This part provides intermediate power capability between reduced-rating and full-rating alternatives.

Precision Tolerance Option:

BZX84-A3V3,215 (NXP Semiconductors) provides ±1% tolerance, the tightest tolerance among available substitutes. This part is suitable for applications requiring precise voltage regulation. Power rating is 250 mW with -65°C to 150°C operating range.

Frequently Asked Questions (FAQ)

Q: Can BZX84C3V3LT1G replace BZX84C3V3 in all applications?

A: BZX84C3V3LT1G is electrically compatible but has reduced maximum power dissipation (250 mW vs. 350 mW). It is suitable for applications where power dissipation does not exceed 250 mW. Extended temperature range (-65°C to 150°C) and RoHS3 compliance make it preferable for new designs. Verify circuit power requirements before substitution.

Q: What is the difference between BZX84C3V3-TP and BZX84C3V3 TR?

A: Both parts maintain 350 mW power rating and 3.3 V nominal voltage. BZX84C3V3-TP (Micro Commercial Co) operates from -55°C to 150°C with impedance of 83 Ohms. BZX84C3V3 TR (Central Semiconductor Corp) operates from -65°C to 150°C with impedance of 95 Ohms. Selection depends on temperature range requirements and impedance specifications for the application.

Q: Are automotive-grade parts (SZBZX84C3V3LT1G, SZBZX84C3V3LT3G) suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification meet or exceed commercial-grade specifications. These parts are suitable for any application requiring the specified electrical parameters. The automotive qualification provides additional reliability assurance.

Q: What is the significance of the impedance difference between BZX84C3V3-TP (83 Ohms) and other substitutes (95 Ohms)?

A: Impedance affects transient response and noise filtering characteristics. Lower impedance (83 Ohms) provides faster response to voltage transients. For most voltage regulation and protection applications, both values are acceptable. Applications requiring specific transient response characteristics should verify impedance specifications.

Q: Can I use BZX84-A3V3,215 (±1% tolerance) instead of BZX84C3V3 (±6% tolerance)?

A: Yes. BZX84-A3V3,215 provides tighter tolerance (±1%) and is therefore a superior substitute from a voltage accuracy perspective. It is suitable for applications requiring precise voltage regulation. All other electrical parameters are compatible.

Q: What packaging formats are available for substitutes?

A: Substitute parts are available in Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Bulk packaging formats. All parts use the same SOT-23-3 (TO-236-3, SC-59) surface mount package. Packaging selection depends on procurement and assembly requirements.

Q: Is RoHS3 compliance required for BZX84C3V3 substitution?

A: RoHS3 compliance is not required for direct substitution but is strongly recommended for new designs and production systems. Most active substitute parts are RoHS3 compliant. Verify compliance requirements with design and procurement specifications.

Q: Can SZBZX84C3V3LT1G and SZBZX84C3V3LT3G be used interchangeably?

A: Yes. Both parts have identical electrical specifications (3.3 V, ±6%, 225 mW, -65°C to 150°C) and automotive qualification (AEC-Q101). The difference is in packaging format and inventory availability. Selection depends on procurement requirements.

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