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CZRT55C15-G Zener Diode 15V 350mW SOT-23-3 Equivalent & Substitute Parts
Part Overview
The CZRT55C15-G is a 15V Zener diode manufactured by Comchip Technology, rated for 350mW power dissipation in a surface mount SOT-23-3 package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Equivalent and substitute parts are identified based on matching electrical parameters and package compatibility to ensure functional interchangeability in circuit applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 15 | V |
| Power - Max | 350 | mW |
| Tolerance | ±6% | — |
| Impedance (Max) | 30 | Ohms |
| Current - Reverse Leakage @ Vr | 100 | nA @ 10.5V |
| Voltage - Forward (Max) @ If | 900 | mV @ 10mA |
| Operating Temperature Range | -65 to 150 | °C |
| Package / Case | SOT-23-3 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution eligibility for the CZRT55C15-G is determined by the following critical parameters:
Primary Matching Criteria:
- Zener voltage (Nom): 15V
- Package / Case: SOT-23-3 (TO-236-3, SC-59)
- Mounting Type: Surface Mount
- Operating Temperature Range: Minimum -65°C to 150°C
- RoHS3 Compliance: Required
Secondary Compatibility Parameters:
- Power - Max: 350mW or greater
- Tolerance: ±6% or tighter
- Impedance (Max): 30 Ohms or lower
- Current - Reverse Leakage @ Vr: 100nA @ 10.5V or lower
- Voltage - Forward (Max) @ If: 900mV @ 10mA or lower
Substitute parts are grouped into two categories:
MFR Recommended Substitutes: Parts meeting all primary and secondary criteria with full manufacturer qualification and active product status.
Parametric Equivalents: Parts meeting all primary criteria and core electrical parameters with minor variations in secondary specifications that do not affect functional performance in standard applications.
Parameter Comparison
| Part Number | Manufacturer | Vz (Nom) | Power (Max) | Tolerance | Zzt (Max) | Ir @ Vr | Vf (Max) | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| CZRT55C15-G | Comchip Technology | 15V | 350mW | ±6% | 30Ω | [email protected] | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
| BZX84B15-7-F | Diodes Incorporated | 15V | 300mW | ±2% | 30Ω | [email protected] | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
| BZX84B15-TP | Micro Commercial Co | 15V | 350mW | ±2% | 30Ω | [email protected] | 900mV@10mA | -55 to 150°C | SOT-23-3 | Active |
| BZX84B15Q-7-F | Diodes Incorporated | 15V | 300mW | ±2% | 30Ω | [email protected] | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
| BZX84C15-7-F | Diodes Incorporated | 15V | 300mW | ±6% | 30Ω | [email protected] | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
| BZX84C15-TP | Micro Commercial Co | 15V | 350mW | ±5% | 30Ω | [email protected] | 900mV@10mA | -55 to 150°C | SOT-23-3 | Active |
| MMBZ5245B-7-F | Diodes Incorporated | 15V | 350mW | ±5% | 16Ω | 100nA@11V | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
| MMBZ5245B-TP | Micro Commercial Co | 15V | 350mW | ±5% | 16Ω | 100nA@11V | 900mV@10mA | -55 to 150°C | SOT-23-3 | Active |
| MMBZ5245BQ-7-F | Diodes Incorporated | 15V | 350mW | ±5% | 16Ω | 100nA@11V | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
| BZX84C15 TR PBFREE | Central Semiconductor Corp | 15V | 350mW | ±5% | 30Ω | [email protected] | 900mV@10mA | -65 to 150°C | SOT-23-3 | Active |
Engineering Selection Recommendations
MFR Recommended Substitutes - Primary Selection:
The following parts are recommended as direct substitutes based on full compliance with primary matching criteria, active product status, and RoHS3 certification:
BZX84B15-7-F (Diodes Incorporated): Meets all primary criteria with tighter tolerance (±2%) and identical impedance. Operating temperature range -65 to 150°C. Power rating 300mW is lower than original; suitable for applications not requiring full 350mW dissipation.
BZX84B15-TP (Micro Commercial Co): Matches original power rating (350mW) with tighter tolerance (±2%). Operating temperature range -55 to 150°C (minimum temperature 10°C higher than original). Suitable for applications within this temperature range.
BZX84B15Q-7-F (Diodes Incorporated): Automotive-grade component with AEC-Q101 qualification. Tighter tolerance (±2%), 300mW power rating. Full temperature range -65 to 150°C. Recommended for automotive and high-reliability applications.
BZX84C15-7-F (Diodes Incorporated): Automotive-grade with AEC-Q101 qualification. Matches original tolerance (±6%), 300mW power rating. Full temperature range -65 to 150°C.
BZX84C15-TP (Micro Commercial Co): Matches original power rating (350mW) and tolerance (±5%). Operating temperature range -55 to 150°C.
MMBZ5245B-7-F (Diodes Incorporated): Matches original power rating (350mW) with improved impedance (16Ω vs 30Ω). Tolerance ±5%. Full temperature range -65 to 150°C.
MMBZ5245B-TP (Micro Commercial Co): Matches original power rating (350mW) with improved impedance (16Ω). Tolerance ±5%. Operating temperature range -55 to 150°C.
MMBZ5245BQ-7-F (Diodes Incorporated): Automotive-grade with AEC-Q101 qualification. Matches original power rating (350mW) with improved impedance (16Ω). Full temperature range -65 to 150°C. Recommended for automotive and high-reliability applications.
Parametric Equivalent - Secondary Selection:
BZX84C15 TR PBFREE (Central Semiconductor Corp): Meets all primary criteria with matching power rating (350mW) and tolerance (±5%). Reverse leakage current 50nA @ 10.5V (lower than original 100nA). Full temperature range -65 to 150°C.
Selection Criteria by Application:
- Standard Commercial Applications: BZX84B15-7-F, BZX84C15-TP, or BZX84C15 TR PBFREE
- Automotive / High-Reliability: BZX84B15Q-7-F, BZX84C15-7-F, or MMBZ5245BQ-7-F
- Low-Temperature Applications (below -55°C): BZX84B15-7-F, BZX84B15Q-7-F, BZX84C15-7-F, MMBZ5245B-7-F, MMBZ5245BQ-7-F, or BZX84C15 TR PBFREE
- Improved Impedance Performance: MMBZ5245B-7-F, MMBZ5245B-TP, or MMBZ5245BQ-7-F
Frequently Asked Questions (FAQ)
Q: Can BZX84B15-7-F replace CZRT55C15-G if my application requires 350mW dissipation?
A: BZX84B15-7-F is rated for 300mW maximum power dissipation, which is lower than the original 350mW rating. This part is suitable only for applications where actual power dissipation does not exceed 300mW. If your circuit requires the full 350mW capability, select BZX84B15-TP, BZX84C15-TP, MMBZ5245B-7-F, MMBZ5245B-TP, MMBZ5245BQ-7-F, or BZX84C15 TR PBFREE.
Q: What is the difference between BZX84 and MMBZ5245 series?
A: Both series are 15V Zener diodes in SOT-23-3 packages with identical nominal voltage and forward voltage characteristics. The primary difference is impedance: BZX84 series has maximum impedance of 30Ω, while MMBZ5245 series has maximum impedance of 16Ω. Lower impedance provides better voltage regulation performance. Both are functionally compatible substitutes.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the original CZRT55C15-G specification.
Q: Which substitute should I use for applications operating below -55°C?
A: Applications requiring operation below -55°C must use parts with full -65°C minimum temperature rating. Suitable options are: BZX84B15-7-F, BZX84B15Q-7-F, BZX84C15-7-F, MMBZ5245B-7-F, MMBZ5245BQ-7-F, or BZX84C15 TR PBFREE. Do not use BZX84B15-TP, BZX84C15-TP, or MMBZ5245B-TP, which are rated only to -55°C minimum.
Q: What does AEC-Q101 qualification mean?
A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this certification (BZX84B15Q-7-F, BZX84C15-7-F, MMBZ5245BQ-7-F) have undergone additional reliability testing and are approved for automotive applications. These parts are suitable for both automotive and general industrial applications.
Q: Can I use a substitute with tighter tolerance (±2%) in place of the original ±6% tolerance?
A: Yes. Parts with tighter tolerance (±2%) such as BZX84B15-7-F and BZX84B15Q-7-F are fully compatible and provide improved voltage accuracy. Tighter tolerance is a performance enhancement and does not create compatibility issues.
Q: What is the significance of impedance (Zzt) in Zener diode selection?
A: Impedance affects voltage regulation quality. Lower impedance (16Ω in MMBZ5245 series vs 30Ω in BZX84 series) provides better voltage stability under varying load conditions. Both values are acceptable for standard applications; lower impedance is preferred for precision voltage regulation circuits.
Q: Are Tape & Reel (TR) and Cut Tape (CT) packaging interchangeable?
A: Both packaging formats contain identical components in SOT-23-3 packages. The difference is in the carrier format: Tape & Reel is used for automated assembly lines, while Cut Tape is used for manual or semi-automated assembly. Component electrical and mechanical specifications are identical. Select based on your assembly process requirements.
Q: What is MSL 1 (Moisture Sensitivity Level)?
A: MSL 1 indicates unlimited moisture sensitivity, meaning the component does not require special moisture control during storage or handling. All listed parts carry MSL 1 rating, eliminating moisture-related handling constraints.
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