BZX84C22 Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX84C22 is a surface mount zener diode rated at 22 V nominal with 350 mW maximum power dissipation in a SOT-23-3 package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability and compliance with current industry standards.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±6%	-
Power - Max	350	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 15.4 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55°C ~ 150°C	-
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the BZX84C22 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Zener (Nom): 22 V (exact match required)
Power - Max: 350 mW or greater (equal or higher rating acceptable)
Impedance (Max): 55 Ohms or lower (equal or lower acceptable)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (equal or lower acceptable)
Operating Temperature Range: Must encompass or exceed -55°C ~ 150°C

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount (required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (required)
Moisture Sensitivity Level: 1 (Unlimited) or equivalent (required)

Compliance Requirements:

RoHS Status: ROHS3 Compliant (preferred for active parts)
REACH Status: REACH Unaffected (required)

Substitute parts are grouped into two categories: parametric equivalents (matching all electrical and mechanical specifications) and similar parts (meeting minimum substitution criteria with acceptable parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Status	RoHS
BZX84C22	onsemi	22 V	±6%	350 mW	55 Ω	900 mV @ 10 mA	-55°C ~ 150°C	Obsolete	-
BZX84C22LT1G	onsemi	22 V	±6%	225 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3
BZX84-C22,215	Nexperia USA Inc.	22 V	±5%	250 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3
BZX84-C22,235	NXP USA Inc.	22 V	±5%	250 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 150°C	Active	-
BZX84C22 TR	Central Semiconductor Corp	22 V	±5%	350 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3
BZX84C22-7-F	Diodes Incorporated	22 V	±6%	300 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3
BZX84C22_R1_00001	Panjit International Inc.	22 V	±5%	410 mW	55 Ω	-	-55°C ~ 150°C	Active	ROHS3
CMPZ5251B TR PBFREE	Central Semiconductor Corp	22 V	±5%	350 mW	29 Ω	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3
MMBZ5251B-TP	Micro Commercial Co	22 V	±5%	350 mW	29 Ω	900 mV @ 10 mA	-55°C ~ 150°C	Active	ROHS3
BZX84C22-TP	Micro Commercial Co	22 V	±5%	350 mW	55 Ω	900 mV @ 10 mA	-55°C ~ 150°C	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

BZX84C22-TP (Micro Commercial Co) is the parametric equivalent to the BZX84C22. This part maintains identical electrical specifications (22 V nominal, 350 mW power rating, 55 Ω impedance) and mechanical compatibility (SOT-23-3 package). The part is active, ROHS3 compliant, and available in Tape & Reel packaging. Operating temperature range matches the original specification at -55°C ~ 150°C.

Primary Active Substitutes (Electrical Compatibility Maintained):

BZX84C22 TR (Central Semiconductor Corp) provides full electrical equivalence with 350 mW power rating and 55 Ω impedance. This part is active and ROHS3 compliant with extended operating temperature range (-65°C ~ 150°C). Tolerance is ±5% versus the original ±6%.

BZX84C22LT1G (onsemi) maintains the same manufacturer as the original part with active status and ROHS3 compliance. This part features extended temperature range (-65°C ~ 150°C) and identical impedance (55 Ω). Power rating is reduced to 225 mW, suitable for applications not requiring full 350 mW dissipation.

Secondary Substitutes (Acceptable Parameter Variations):

BZX84-C22,215 (Nexperia USA Inc.) and BZX84-C22,235 (NXP USA Inc.) are automotive-grade parts with AEC-Q101 qualification. Both maintain 22 V nominal voltage and 55 Ω impedance with ±5% tolerance. Power ratings are 250 mW, lower than the original 350 mW specification. Extended temperature range (-65°C ~ 150°C) is provided.

BZX84C22-7-F (Diodes Incorporated) offers 300 mW power rating with 55 Ω impedance and ±6% tolerance matching the original. Extended temperature range (-65°C ~ 150°C) and ROHS3 compliance are provided.

CMPZ5251B TR PBFREE and MMBZ5251B-TP both feature improved impedance characteristics (29 Ω versus 55 Ω) with 350 mW power rating. These parts are suitable for applications where lower impedance is beneficial. Both are ROHS3 compliant and active.

BZX84C22_R1_00001 (Panjit International Inc.) provides the highest power rating at 410 mW with 55 Ω impedance and ±5% tolerance. This part is active and ROHS3 compliant.

Selection Criteria by Application:

For direct replacement in existing designs, use BZX84C22-TP or BZX84C22 TR. For new designs requiring automotive qualification, select BZX84-C22,215 or BZX84-C22,235. For applications requiring extended temperature range with lower power dissipation, BZX84C22LT1G is appropriate. For applications benefiting from lower impedance characteristics, CMPZ5251B TR PBFREE or MMBZ5251B-TP are suitable.

Frequently Asked Questions (FAQ)

Q: Can BZX84C22LT1G replace the original BZX84C22 in all applications?

A: BZX84C22LT1G is electrically compatible with identical voltage (22 V) and impedance (55 Ω) specifications. However, the power rating is reduced from 350 mW to 225 mW. This part is suitable for applications where power dissipation does not exceed 225 mW. Extended temperature range (-65°C ~ 150°C) provides additional operational margin compared to the original (-55°C ~ 150°C).

Q: What is the difference between BZX84C22-TP and BZX84C22 TR?

A: Both parts maintain 22 V nominal voltage, 350 mW power rating, and 55 Ω impedance. BZX84C22-TP is manufactured by Micro Commercial Co with operating temperature -55°C ~ 150°C. BZX84C22 TR is manufactured by Central Semiconductor Corp with extended operating temperature -65°C ~ 150°C. Both are ROHS3 compliant and active. Selection depends on temperature requirements and supplier availability.

Q: Are CMPZ5251B TR PBFREE and MMBZ5251B-TP suitable replacements?

A: These parts maintain 22 V nominal voltage and 350 mW power rating. The key difference is impedance: 29 Ω versus the original 55 Ω. Lower impedance provides improved voltage regulation characteristics in certain circuit topologies. Both parts are ROHS3 compliant and active. Compatibility depends on circuit design requirements for impedance specifications.

Q: What is the significance of automotive qualification (AEC-Q101)?

A: BZX84-C22,215 and BZX84-C22,235 carry AEC-Q101 qualification, indicating compliance with automotive industry reliability standards. These parts are suitable for automotive applications requiring certified component qualification. Non-automotive parts do not carry this certification.

Q: Can I use BZX84C22-7-F as a direct replacement?

A: BZX84C22-7-F maintains 22 V nominal voltage, 55 Ω impedance, and ±6% tolerance matching the original. Power rating is 300 mW versus the original 350 mW. This part is suitable for applications where power dissipation does not exceed 300 mW. Extended temperature range (-65°C ~ 150°C) and ROHS3 compliance are provided.

Q: What packaging options are available for these substitutes?

A: All substitute parts are available in SOT-23-3 (TO-236-3, SC-59) surface mount package, matching the original BZX84C22. Packaging formats vary by manufacturer: Tape & Reel (TR), Cut Tape (CT), Digi-Reel, and Bulk. Selection depends on production volume and assembly requirements.

Q: Is RoHS compliance required for all substitutes?

A: Active substitute parts listed are ROHS3 compliant. The original BZX84C22 (obsolete) does not specify RoHS status. For new designs and production, ROHS3 compliant parts are recommended to meet current environmental and regulatory requirements.

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

A: The original BZX84C22 specifies ±6% tolerance on the 22 V nominal voltage. Most active substitutes specify ±5% tolerance, providing tighter voltage regulation. Both tolerances are acceptable for standard zener diode applications. Circuit designs should account for the specified tolerance range.

Q: Can BZX84C22_R1_00001 be used in high-power applications?

A: BZX84C22_R1_00001 provides the highest power rating at 410 mW among the listed substitutes. This part is suitable for applications requiring maximum power dissipation capability while maintaining 22 V nominal voltage and 55 Ω impedance. Operating temperature range is -55°C ~ 150°C, matching the original specification.

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