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BZX84C30-TP Equivalent & Substitute Parts
Part Overview
The BZX84C30-TP is a 30 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW power dissipation with ±5% voltage tolerance. The device is packaged in SOT-23 surface mount configuration and is classified as Active product status. This part is RoHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating.
Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining surface mount SOT-23 packaging compatibility. Alternative sources become necessary due to inventory availability, lead time requirements, or design flexibility across multiple manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 30 | V |
| Tolerance | ±5% | — |
| Power - Max | 350 | mW |
| Impedance (Max) | 80 | Ohms |
| Current - Reverse Leakage @ Vr | 100 | nA @ 21 V |
| Voltage - Forward (Vf) (Max) @ If | 900 | mV @ 10 mA |
| Operating Temperature | -55 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | — |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following criteria:
Primary Electrical Parameters:
- Zener voltage: 30 V nominal
- Voltage tolerance: ±5% or ±7% acceptable
- Power rating: 225 mW minimum to 350 mW maximum
- Impedance: 49 to 80 Ohms maximum
- Reverse leakage current: 50 to 100 nA @ 21–23 V
- Forward voltage: 900 mV maximum @ 10 mA
Mechanical & Packaging Requirements:
- Mounting type: Surface Mount
- Package: TO-236-3, SC-59, or SOT-23-3 equivalent
- Moisture sensitivity: MSL 1 (Unlimited)
Compliance & Status:
- Product status: Active
- RoHS3 compliance required
- REACH Unaffected status
Parts are grouped into two categories based on power rating and impedance characteristics:
Group A (350 mW, 80 Ohms): Direct electrical equivalents with identical power and impedance specifications. Includes BZX84C30-TP, MMBZ5256B-7-F.
Group B (225–300 mW, 49–80 Ohms): Functional substitutes with reduced power dissipation or lower impedance. Includes BZX84-C30,215, BZX84-C30,235, BZX84C30-7-F, BZX84C30LT1G, MMBZ5256BLT1G, MMBZ5256ELT1G, SZBZX84C30ET1G, SZBZX84C30LT1G, SZMMBZ5256BLT1G.
Parameter Comparison
| Part Number | Manufacturer | Vz (V) | Tolerance | Power (mW) | Zzt (Ohms) | Ir @ Vr (nA) | Temp Range (°C) | Grade | AEC-Q101 |
|---|---|---|---|---|---|---|---|---|---|
| BZX84C30-TP | Micro Commercial Co | 30 | ±5% | 350 | 80 | 100 @ 21V | -55 to 150 | — | — |
| BZX84-C30,215 | NXP Semiconductors | 30 | ±5% | 250 | 80 | 50 @ 21V | -65 to 150 | Automotive | Yes |
| BZX84-C30,235 | NXP USA Inc. | 30 | ±5% | 250 | 80 | 50 @ 21V | -65 to 150 | Automotive | Yes |
| BZX84C30-7-F | Diodes Incorporated | 30 | ±7% | 300 | 80 | 100 @ 21V | -65 to 150 | — | — |
| BZX84C30LT1G | onsemi | 30 | ±7% | 225 | 80 | 50 @ 21V | -65 to 150 | — | — |
| MMBZ5256B-7-F | Diodes Incorporated | 30 | ±5% | 350 | 49 | 100 @ 23V | -65 to 150 | — | — |
| MMBZ5256BLT1G | onsemi | 30 | ±5% | 225 | 49 | 100 @ 23V | -65 to 150 | — | — |
| MMBZ5256ELT1G | onsemi | 30 | ±5% | 225 | 49 | 100 @ 23V | -55 to 150 | — | — |
| SZBZX84C30ET1G | onsemi | 30 | ±7% | 225 | 80 | 50 @ 21V | -65 to 150 | Automotive | Yes |
| SZBZX84C30LT1G | onsemi | 30 | ±7% | 225 | 80 | 50 @ 21V | -65 to 150 | Automotive | Yes |
| SZMMBZ5256BLT1G | onsemi | 30 | ±5% | 225 | 49 | 100 @ 23V | -65 to 150 | Automotive | Yes |
Engineering Selection Recommendations
Direct Equivalents (350 mW, ±5% Tolerance):
MMBZ5256B-7-F (Diodes Incorporated) provides identical electrical specifications to BZX84C30-TP with the exception of impedance (49 Ohms vs. 80 Ohms). This lower impedance characteristic results in improved voltage regulation performance. The part is RoHS3 compliant, MSL 1 rated, and Active status. Operating temperature range extends to -65°C, providing broader environmental coverage than the primary part.
Functional Substitutes with Reduced Power Rating (225–300 mW):
Parts rated at 225 mW or 300 mW are suitable for applications where the full 350 mW dissipation capability is not required. These include BZX84C30LT1G, MMBZ5256BLT1G, MMBZ5256ELT1G, SZBZX84C30ET1G, and SZBZX84C30LT1G. All maintain the 30 V nominal zener voltage and are RoHS3 compliant with MSL 1 rating.
Automotive-Grade Options:
For applications requiring automotive qualification, BZX84-C30,215, BZX84-C30,235, SZBZX84C30ET1G, SZBZX84C30LT1G, and SZMMBZ5256BLT1G carry AEC-Q101 certification and Automotive grade designation. These parts are suitable for automotive and industrial environments with extended temperature ranges (-65°C to 150°C).
Tolerance Considerations:
BZX84C30-TP and MMBZ5256B-7-F maintain ±5% voltage tolerance. Parts with ±7% tolerance (BZX84C30-7-F, BZX84C30LT1G, SZBZX84C30ET1G, SZBZX84C30LT1G) are acceptable where tighter voltage regulation is not critical.
Frequently Asked Questions (FAQ)
Q: Can BZX84C30-TP be replaced with a 225 mW rated part?
A: Yes, provided the application does not require the full 350 mW power dissipation capability. Parts such as BZX84C30LT1G, MMBZ5256BLT1G, and SZBZX84C30LT1G maintain the 30 V zener voltage and SOT-23 packaging while operating at reduced power levels. Circuit thermal analysis is required to confirm adequate margin.
Q: What is the difference between BZX84 and MMBZ5256 series parts?
A: Both series provide 30 V zener diodes in SOT-23 packaging. The primary difference is impedance: BZX84 series typically specifies 80 Ohms maximum impedance, while MMBZ5256 series specifies 49 Ohms maximum. Lower impedance provides superior voltage regulation characteristics. Both series are electrically compatible for 30 V zener applications.
Q: Are NXP BZX84-C30 parts (BZX84-C30,215 and BZX84-C30,235) interchangeable?
A: Yes. Both NXP parts share identical electrical specifications: 30 V nominal, ±5% tolerance, 250 mW power rating, 80 Ohms impedance, and AEC-Q101 automotive qualification. The difference is packaging format: BZX84-C30,215 is supplied in standard packaging, while BZX84-C30,235 is supplied in Bulk packaging. Electrical performance is equivalent.
Q: Which substitute part offers the widest operating temperature range?
A: MMBZ5256ELT1G maintains the original -55°C lower temperature limit of BZX84C30-TP. All other substitutes extend the lower limit to -65°C. Upper temperature limit is 150°C across all parts.
Q: Can I use an automotive-grade part in a non-automotive application?
A: Yes. Automotive-grade parts (BZX84-C30,215, BZX84-C30,235, SZBZX84C30ET1G, SZBZX84C30LT1G, SZMMBZ5256BLT1G) meet or exceed the electrical and reliability requirements of standard-grade parts. AEC-Q101 certification indicates enhanced qualification testing and is suitable for any application requiring high reliability.
Q: What does MSL 1 (Unlimited) moisture sensitivity mean?
A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitute parts carry MSL 1 rating, eliminating moisture-related compatibility concerns.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts are RoHS3 compliant and REACH Unaffected, matching the compliance status of BZX84C30-TP.
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