BZX79-B22,133 Equivalent & Substitute Parts

Part Overview

The BZX79-B22,133 is a 22 V, 400 mW Zener diode manufactured by Nexperia USA Inc. in the DO-204AH (DO-35) axial through-hole package. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Substitute parts may be required due to inventory constraints, packaging preferences, or application-specific performance requirements while maintaining electrical compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	22	V
Tolerance	±2%	—
Power - Maximum	400	mW
Impedance (Maximum)	55	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 15.4 V	—
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BZX79-B22,133 are classified based on electrical parameter compatibility and mechanical form factor alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

Zener voltage nominal value: 22 V
Mounting type: Through Hole
Package compatibility: DO-204AH (DO-35) or equivalent axial configuration
Operating temperature range: Minimum -65°C to 200°C coverage
RoHS3 compliance status

Substitution Categories:

Parametric Equivalent: Parts with identical or tighter electrical specifications and matching packaging. BZX79-B22,143 qualifies as a parametric equivalent, differing only in packaging format (Bulk vs. Tape & Box) while maintaining all electrical characteristics.

Similar Substitute: Parts with the same nominal Zener voltage and through-hole mounting but with variations in power rating, impedance, tolerance, or package type. 1N5251B-TAP and BZT03C22-TR are classified as similar substitutes due to differences in power dissipation capability, impedance characteristics, or physical package dimensions while maintaining the 22 V Zener voltage specification.

Parameter Comparison

Parameter	BZX79-B22,133 (Main)	BZX79-B22,143 (Parametric Equivalent)	1N5251B-TAP (Similar)	BZT03C22-TR (Similar)
Manufacturer	Nexperia USA Inc.	NXP USA Inc.	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	22 V	22 V	22 V	22 V
Tolerance	±2%	±2%	±5%	±5.68%
Power - Max	400 mW	400 mW	500 mW	1.3 W
Impedance (Max)	55 Ohms	55 Ohms	29 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 15.4 V	50 nA @ 15.4 V	100 nA @ 17 V	1 µA @ 16 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.2 V @ 500 mA
Operating Temperature	-65 to 200°C	-65 to 200°C	175°C (Max)	175°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	SOD-57, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

BZX79-B22,143 (Parametric Equivalent): This part is a direct parametric equivalent to the BZX79-B22,133. Both components share identical electrical specifications including 22 V nominal Zener voltage, ±2% tolerance, 400 mW power rating, 55 Ohms maximum impedance, and -65°C to 200°C operating temperature range. The sole difference is packaging format (Bulk vs. Tape & Box). Both are manufactured by NXP entities and maintain ROHS3 compliance. This substitute is suitable for direct replacement in all applications where the BZX79-B22,133 is specified.

1N5251B-TAP (Similar Substitute): The 1N5251B-TAP maintains the 22 V nominal Zener voltage and through-hole axial package configuration. This part offers increased power dissipation capability (500 mW vs. 400 mW) and lower impedance (29 Ohms vs. 55 Ohms). However, tolerance is wider (±5% vs. ±2%), and the maximum operating temperature is limited to 175°C compared to 200°C. This substitute is applicable in applications where the tighter tolerance and higher temperature range of the main part are not required. The part carries AEC-Q101 automotive qualification.

BZT03C22-TR (Similar Substitute): The BZT03C22-TR provides the highest power dissipation capability (1.3 W) and lowest impedance (15 Ohms) among the listed substitutes. The nominal Zener voltage remains 22 V. However, this part uses a different package type (SOD-57 vs. DO-35), has wider tolerance (±5.68%), higher reverse leakage current (1 µA @ 16 V), and a maximum operating temperature of 175°C. Physical package differences require PCB layout modification. This substitute is suitable for applications requiring higher power handling or lower impedance characteristics where package form factor change is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B22,143 be used as a direct replacement for BZX79-B22,133?

A: Yes. BZX79-B22,143 is a parametric equivalent with identical electrical specifications and the same through-hole axial package. The only difference is packaging format (Bulk vs. Tape & Box). Direct substitution is valid for all applications.

Q: What are the key differences between the main part and 1N5251B-TAP?

A: Both maintain 22 V nominal Zener voltage and through-hole mounting. 1N5251B-TAP offers higher power rating (500 mW vs. 400 mW) and lower impedance (29 Ohms vs. 55 Ohms), but has wider tolerance (±5% vs. ±2%) and lower maximum operating temperature (175°C vs. 200°C). The part is AEC-Q101 qualified for automotive applications.

Q: Is BZT03C22-TR compatible with the BZX79-B22,133 in terms of package?

A: BZT03C22-TR uses SOD-57 package, which differs from the DO-35 (DO-204AH) package of the main part. Physical package differences require PCB layout modification. Electrical compatibility at 22 V nominal Zener voltage is maintained, but mechanical form factor change is necessary.

Q: Which substitute should be selected for applications requiring the widest operating temperature range?

A: The BZX79-B22,133 and BZX79-B22,143 both support -65°C to 200°C operating temperature. Both 1N5251B-TAP and BZT03C22-TR are limited to 175°C maximum. For applications requiring the full -65°C to 200°C range, use the main part or its parametric equivalent BZX79-B22,143.

Q: What is the tolerance difference between the main part and similar substitutes?

A: BZX79-B22,133 has ±2% tolerance. 1N5251B-TAP has ±5% tolerance. BZT03C22-TR has ±5.68% tolerance. Tighter tolerance of the main part provides more precise Zener voltage regulation. Applications requiring strict voltage regulation should use the main part or parametric equivalent.

Q: Can 1N5251B-TAP be used in high-temperature applications?

A: 1N5251B-TAP is rated to 175°C maximum operating temperature, which is lower than the BZX79-B22,133 specification of 200°C. For applications requiring operation above 175°C, use the main part or parametric equivalent BZX79-B22,143.

Q: What is the impedance difference and when does it matter?

A: BZX79-B22,133 has 55 Ohms maximum impedance. 1N5251B-TAP has 29 Ohms. BZT03C22-TR has 15 Ohms. Lower impedance provides better voltage regulation under load changes. Applications with stringent voltage regulation requirements should consider impedance specifications.

Q: Are all listed parts RoHS3 compliant?

A: Yes. BZX79-B22,133, BZX79-B22,143, 1N5251B-TAP, and BZT03C22-TR are all ROHS3 compliant and REACH unaffected.

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