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BZX84C22-7 Equivalent & Substitute Parts
Part Overview
The BZX84C22-7 is a 22 V zener diode rated for 300 mW maximum power dissipation in a surface mount SOT-23-3 package, manufactured by Diodes Incorporated. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives within defined parameter tolerances.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 22 | V |
| Tolerance | ±6% | — |
| Power - Maximum | 300 | mW |
| Impedance (Maximum) | 55 | Ohms |
| Current - Reverse Leakage @ Vr | 100 nA @ 15.4 V | — |
| Voltage - Forward (Maximum) @ If | 900 mV @ 10 mA | — |
| Operating Temperature Range | -65 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | — |
| RoHS Status | RoHS Non-Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the BZX84C22-7 is determined by the following critical parameters: nominal zener voltage (22 V), maximum power rating, impedance specification (55 Ohms), reverse leakage current, forward voltage characteristics, operating temperature range (-65°C to 150°C), and surface mount SOT-23-3 package compatibility.
Substitute parts are grouped into the following categories:
Parametric Equivalents (Diodes Incorporated): Parts BZX84B22-7-F and BZX84C22-7-F maintain identical zener voltage, impedance, forward voltage, and operating temperature specifications. BZX84B22-7-F offers improved tolerance (±2% versus ±6%) while maintaining 300 mW power rating. BZX84C22-7-F is functionally identical to the main part with improved RoHS3 compliance and active product status.
Direct Manufacturer Alternatives (Central Semiconductor Corp): BZX84C22 TR provides 22 V zener voltage with 350 mW power rating (50 mW higher than main part), ±5% tolerance, and identical impedance and forward voltage characteristics.
Manufacturer Recommended Parts (Nexperia/NXP): BZX84-C22,215 and BZX84-C22,235 offer 22 V zener voltage with 250 mW power rating (50 mW lower than main part), ±5% tolerance, and automotive-grade qualification (AEC-Q101). These parts are suitable for applications where lower power dissipation is acceptable.
Manufacturer Recommended Parts (onsemi): BZX84B22LT1G and BZX84C22LT1G provide 22 V zener voltage with 225 mW power rating, ±2% and ±6% tolerance respectively, and identical impedance specifications. MMBZ5251BLT1G and SZBZX84B22LT1G offer alternative base part numbers with 22 V zener voltage and 225 mW power rating, with SZBZX84B22LT1G providing automotive-grade qualification.
Alternative Manufacturer (Central Semiconductor Corp): CMPZ5251B TR PBFREE provides 22 V zener voltage with 350 mW power rating and 29 Ohms impedance (lower than main part specification).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power (mW) | Zzt (Ohms) | Ir @ Vr | Vf (Max) @ If | Temp Range (°C) | Package | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| BZX84C22-7 | Diodes Incorporated | 22 | ±6% | 300 | 55 | 100 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | Non-Compliant | Discontinued |
| BZX84B22-7-F | Diodes Incorporated | 22 | ±2% | 300 | 55 | 100 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| BZX84C22-7-F | Diodes Incorporated | 22 | ±6% | 300 | 55 | 100 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| BZX84C22 TR | Central Semiconductor Corp | 22 | ±5% | 350 | 55 | 50 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| BZX84-C22,215 | Nexperia USA Inc. | 22 | ±5% | 250 | 55 | 50 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| BZX84-C22,235 | NXP USA Inc. | 22 | ±5% | 250 | 55 | 50 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| BZX84B22LT1G | onsemi | 22 | ±2% | 225 | 55 | 50 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| BZX84C22LT1G | onsemi | 22 | ±6% | 225 | 55 | 50 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| CMPZ5251B TR PBFREE | Central Semiconductor Corp | 22 | ±5% | 350 | 29 | 100 nA @ 17 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| MMBZ5251BLT1G | onsemi | 22 | ±5% | 225 | 29 | 100 nA @ 17 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
| SZBZX84B22LT1G | onsemi | 22 | ±2% | 225 | 55 | 50 nA @ 15.4 V | 900 mV @ 10 mA | -65 to 150 | SOT-23-3 | ROHS3 Compliant | Active |
Engineering Selection Recommendations
Primary Equivalent (Direct Replacement): BZX84C22-7-F is the direct functional equivalent to the discontinued BZX84C22-7. This part maintains identical electrical specifications (22 V zener voltage, 300 mW power rating, ±6% tolerance, 55 Ohms impedance) and package configuration. BZX84C22-7-F is active in production with ROHS3 compliance and 35,300 units in stock, providing immediate availability for design continuity.
Improved Tolerance Alternative: BZX84B22-7-F offers superior tolerance performance (±2% versus ±6%) while maintaining the 300 mW power rating and all other electrical characteristics. This part is suitable for applications requiring tighter voltage regulation and is available with ROHS3 compliance.
Higher Power Rating Option: BZX84C22 TR (Central Semiconductor Corp) provides 350 mW power rating (50 mW higher than the main part) with 22 V zener voltage and ±5% tolerance. This part is appropriate for applications where increased thermal margin is required. CMPZ5251B TR PBFREE offers equivalent 350 mW power rating with alternative impedance characteristics (29 Ohms versus 55 Ohms).
Lower Power Rating Options: BZX84-C22,215, BZX84-C22,235, BZX84B22LT1G, BZX84C22LT1G, MMBZ5251BLT1G, and SZBZX84B22LT1G all provide 225–250 mW power ratings. These parts are suitable for applications where the main part's 300 mW rating exceeds thermal requirements. BZX84-C22,215 and BZX84-C22,235 carry automotive-grade qualification (AEC-Q101), appropriate for automotive applications. SZBZX84B22LT1G also provides automotive-grade qualification with ±2% tolerance.
Compliance Consideration: All substitute parts listed are ROHS3 compliant, addressing the non-compliant status of the discontinued BZX84C22-7. Selection should prioritize active production status and compliance requirements for new designs.
Frequently Asked Questions (FAQ)
Q: Can BZX84C22-7-F be used as a direct replacement for BZX84C22-7?
A: Yes. BZX84C22-7-F is functionally equivalent with identical zener voltage (22 V), power rating (300 mW), tolerance (±6%), impedance (55 Ohms), and operating temperature range. Both use SOT-23-3 packaging. The primary difference is that BZX84C22-7-F is active in production with ROHS3 compliance.
Q: What is the difference between BZX84B22-7-F and BZX84C22-7-F?
A: Both parts maintain 22 V zener voltage, 300 mW power rating, and 55 Ohms impedance. The primary difference is tolerance: BZX84B22-7-F offers ±2% tolerance compared to ±6% for BZX84C22-7-F. Selection depends on voltage regulation precision requirements.
Q: Can I use a 225 mW rated part instead of the 300 mW rated BZX84C22-7?
A: Substitution with lower power-rated parts (225 mW) is permissible only if circuit thermal analysis confirms that maximum power dissipation does not exceed the substitute part's rating. Parts such as BZX84B22LT1G, BZX84C22LT1G, MMBZ5251BLT1G, and SZBZX84B22LT1G are suitable for applications with reduced power requirements.
Q: Are there automotive-qualified alternatives available?
A: Yes. BZX84-C22,215, BZX84-C22,235, and SZBZX84B22LT1G carry automotive-grade qualification with AEC-Q101 certification. These parts are appropriate for automotive applications requiring functional equivalence with regulatory compliance.
Q: What is the impedance difference between BZX84C22 TR and CMPZ5251B TR PBFREE?
A: BZX84C22 TR has 55 Ohms impedance, matching the main part specification. CMPZ5251B TR PBFREE has 29 Ohms impedance. Lower impedance results in improved voltage regulation at higher currents. Selection depends on circuit requirements for dynamic impedance performance.
Q: Are all substitute parts available in the same packaging?
A: All substitute parts listed use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, maintaining mechanical compatibility with the original BZX84C22-7. Packaging variations exist only in supplier delivery format (Tape & Reel, Cut Tape, or Bulk).
Q: What is the reverse leakage current difference between substitute parts?
A: The main part and most substitutes specify 100 nA @ 15.4 V reverse leakage. CMPZ5251B TR PBFREE and MMBZ5251BLT1G specify 100 nA @ 17 V. Other substitutes specify 50 nA @ 15.4 V. Lower leakage current improves circuit performance in high-impedance applications.
Q: Can I mix different substitute parts in the same design?
A: All listed substitute parts maintain 22 V zener voltage and SOT-23-3 packaging, permitting functional interchangeability within a single design. However, tolerance and power rating variations should be evaluated against circuit specifications to ensure consistent performance across production batches.
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