BZX84C22-TP Equivalent & Substitute Parts

Part Overview

The BZX84C22-TP is a 22 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW power dissipation in a surface mount SOT-23 package. This component is classified as Active and is in current production. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits across industrial, consumer, and automotive applications. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements such as automotive qualification or enhanced electrical performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	22	V
Power - Maximum	350	mW
Tolerance	±5%	—
Impedance (Maximum)	55	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 15.4 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Zener voltage: 22 V (nominal)
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating temperature range: Minimum -55°C (main part) to -65°C (substitute parts acceptable)
Forward voltage: 900 mV @ 10 mA
Impedance: 55 Ohms (primary specification; 29 Ohms acceptable for MMBZ5251B-7-F)

Secondary Substitution Criteria:

Power rating: 225 mW to 350 mW (lower power ratings acceptable for reduced dissipation applications)
Tolerance: ±2% to ±6% (tighter tolerance acceptable; wider tolerance acceptable)
Reverse leakage: 50 nA to 100 nA @ 15.4 V (lower leakage acceptable)
Compliance: RoHS3, REACH Unaffected, MSL 1

Substitute parts are grouped into two categories: standard industrial-grade parts and automotive-qualified parts (AEC-Q101). All substitute parts maintain the 22 V zener voltage specification and SOT-23-3 package compatibility required for direct board-level replacement.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ω)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Automotive Grade
BZX84C22-TP	Micro Commercial Co	22	350	±5%	55	100 @ 15.4	900 @ 10	-55 to 150	No
BZX84B22LT1G	onsemi	22	225	±2%	55	50 @ 15.4	900 @ 10	-65 to 150	No
BZX84C22-7-F	Diodes Incorporated	22	300	±6%	55	100 @ 15.4	900 @ 10	-65 to 150	No
BZX84C22LT1G	onsemi	22	225	±6%	55	50 @ 15.4	900 @ 10	-65 to 150	No
MMBZ5251B-7-F	Diodes Incorporated	22	350	±5%	29	100 @ 17	900 @ 10	-65 to 150	No
SZBZX84B22LT1G	onsemi	22	225	±2%	55	50 @ 15.4	900 @ 10	-65 to 150	Yes (AEC-Q101)
SZBZX84C22ET1G	onsemi	22	225	±6%	55	50 @ 15.4	900 @ 10	-65 to 150	Yes (AEC-Q101)
SZBZX84C22LT1G	onsemi	22	225	±6%	55	50 @ 15.4	900 @ 10	-65 to 150	Yes (AEC-Q101)
SZBZX84C22LT3G	onsemi	22	225	±6%	55	50 @ 15.4	900 @ 10	-65 to 150	Yes (AEC-Q101)

Engineering Selection Recommendations

For Standard Industrial Applications:

BZX84C22-7-F (Diodes Incorporated) provides the closest electrical match to the BZX84C22-TP with 300 mW power rating, ±6% tolerance, and identical impedance specification. This part maintains the same zener voltage and forward voltage characteristics while extending the operating temperature range to -65°C. RoHS3 compliance and MSL 1 rating are equivalent.

BZX84B22LT1G (onsemi) offers tighter tolerance (±2%) and lower reverse leakage (50 nA) at the cost of reduced power dissipation (225 mW). This part is suitable for applications where lower leakage current and improved voltage accuracy are required.

MMBZ5251B-7-F (Diodes Incorporated) matches the 350 mW power rating and ±5% tolerance of the main part but features lower impedance (29 Ohms). This characteristic may be advantageous in high-frequency applications or where lower dynamic resistance is beneficial.

For Automotive Applications:

SZBZX84B22LT1G, SZBZX84C22ET1G, SZBZX84C22LT1G, and SZBZX84C22LT3G are all AEC-Q101 qualified automotive-grade parts manufactured by onsemi. These parts are suitable for automotive and harsh-environment applications requiring automotive qualification. All maintain 22 V zener voltage, 225 mW power rating, 55 Ohm impedance, and -65 to 150°C operating range. Tolerance varies between ±2% and ±6% depending on part number suffix.

All substitute parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 rating, ensuring compatibility with standard manufacturing processes and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can BZX84C22-TP be directly replaced with a lower power-rated substitute such as BZX84B22LT1G (225 mW)?

A: Direct replacement is possible if the application circuit does not require the full 350 mW dissipation capability. The 225 mW rating is sufficient for voltage regulation and protection circuits with moderate current levels. Circuit analysis is required to confirm that peak power dissipation does not exceed 225 mW under worst-case conditions.

Q: What is the difference between standard BZX84 series and automotive SZBZX84 series parts?

A: The SZBZX84 series parts carry AEC-Q101 automotive qualification, indicating compliance with automotive reliability and quality standards. Electrically, both series maintain identical zener voltage (22 V), impedance (55 Ohms), and forward voltage characteristics. SZBZX84 parts are required for automotive applications; standard BZX84 parts are suitable for industrial and consumer applications.

Q: Is MMBZ5251B-7-F a suitable substitute despite having lower impedance (29 Ohms vs. 55 Ohms)?

A: MMBZ5251B-7-F is electrically compatible for applications where lower dynamic impedance is acceptable or beneficial. Lower impedance results in better voltage regulation under load changes and reduced output impedance. The 350 mW power rating and ±5% tolerance match the main part specification. Impedance difference does not prevent substitution but may improve circuit performance in certain applications.

Q: What is the impact of tolerance differences (±2%, ±5%, ±6%) on circuit design?

A: Tolerance specification defines the acceptable range of zener voltage at nominal test current. ±2% tolerance (BZX84B22LT1G, SZBZX84B22LT1G) provides tighter voltage accuracy, suitable for precision voltage reference applications. ±5% and ±6% tolerances are acceptable for general-purpose regulation and protection circuits where voltage accuracy within ±1.1 V to ±1.3 V is acceptable.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: All substitute parts listed are packaged in SOT-23-3 (TO-236-3, SC-59) surface mount package, ensuring mechanical and electrical compatibility with the original BZX84C22-TP footprint. No PCB layout modifications are required for direct substitution.

Q: What is the significance of operating temperature range extension from -55°C to -65°C?

A: All substitute parts extend the minimum operating temperature to -65°C compared to the main part's -55°C specification. This extended range provides additional margin for applications operating in cold environments or with temperature cycling stress. The upper temperature limit remains 150°C for all parts.

Q: Can BZX84C22-TP be substituted in applications requiring AEC-Q101 automotive qualification?

A: No. The BZX84C22-TP is not automotive qualified. For automotive applications, SZBZX84B22LT1G, SZBZX84C22ET1G, SZBZX84C22LT1G, or SZBZX84C22LT3G must be used. These parts carry explicit AEC-Q101 qualification and are suitable for automotive-grade circuit designs.

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