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BZX84-C30,235 Equivalent & Substitute Parts
Part Overview
The BZX84-C30,235 is a 30 V Zener diode rated at 250 mW with ±5% tolerance, manufactured by Nexperia USA Inc. in Surface Mount TO-236AB packaging. This component is classified as Active product status and meets automotive-grade requirements with AEC-Q101 qualification. The device operates across the temperature range of -65°C to 150°C and is ROHS3 compliant.
Equivalent and substitute parts are identified based on matching or superior electrical characteristics within the same package family. Substitution becomes necessary when the primary part number reaches end-of-life status, experiences supply constraints, or when design flexibility permits selection from alternative manufacturers offering compatible specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 30 | V |
| Tolerance | ±5% | — |
| Power - Maximum | 250 | mW |
| Impedance (Maximum) | 80 | Ohms |
| Current - Reverse Leakage @ Vr | 50 | nA @ 21 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 | — |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
Substitute Part Grouping Explanation
Substitution logic for the BZX84-C30,235 is based on the following critical parameters:
Primary Matching Criteria:
- Zener voltage: 30 V nominal
- Package type: TO-236-3 / SOT-23-3 surface mount
- Operating temperature range: -65°C to 150°C minimum
- Mounting type: Surface Mount
Secondary Compatibility Criteria:
- Power rating: 250 mW or greater
- Impedance: 80 Ohms or lower
- Reverse leakage current: 50 nA or lower @ specified voltage
- Forward voltage: 900 mV maximum @ 10 mA
Parts are grouped into three categories:
Parametric Equivalents: Parts with identical zener voltage, package, and operating temperature range, differing only in tolerance specification (±1%, ±2%, ±5%).
Direct Manufacturers: Parts from alternative manufacturers (onsemi, Diodes Incorporated, Micro Commercial Co) with matching 30 V zener voltage and SOT-23-3 packaging, with minor variations in power rating or tolerance.
Similar Parts: Parts with 30 V zener voltage and compatible packaging but with different impedance values, power ratings, or temperature ranges that remain functionally compatible within the specified parameters.
Parameter Comparison
| Part Number | Manufacturer | Vz (V) | Tolerance | Power (mW) | Zzt (Ohms) | Ir @ Vr (nA) | Vf Max (mV) | Temp Range (°C) | Package | Grade |
|---|---|---|---|---|---|---|---|---|---|---|
| BZX84-C30,235 | Nexperia USA Inc. | 30 | ±5% | 250 | 80 | 50 @ 21V | 900 | -65 to 150 | TO-236AB | Automotive |
| BZX84-A30,215 | Nexperia USA Inc. | 30 | ±1% | 250 | 80 | 50 @ 700mV | 900 | -65 to 150 | TO-236AB | Automotive |
| BZX84-B30,215 | NXP Semiconductors | 30 | ±2% | 250 | 80 | 50 @ 21V | 900 | -65 to 150 | TO-236AB | Automotive |
| BZX84-C30,215 | NXP Semiconductors | 30 | ±5% | 250 | 80 | 50 @ 21V | 900 | -65 to 150 | TO-236AB | Automotive |
| BZX84C30LT1G | onsemi | 30 | ±7% | 225 | 80 | 50 @ 21V | 900 | -65 to 150 | SOT-23-3 | — |
| BZX84C30-7-F | Diodes Incorporated | 30 | ±7% | 300 | 80 | 100 @ 21V | 900 | -65 to 150 | SOT-23-3 | — |
| BZX84C30-TP | Micro Commercial Co | 30 | ±5% | 350 | 80 | 100 @ 21V | 900 | -55 to 150 | SOT-23 | — |
| MMBZ5256BLT1G | onsemi | 30 | ±5% | 225 | 49 | 100 @ 23V | 900 | -65 to 150 | SOT-23-3 | — |
| MMBZ5256ELT1G | onsemi | 30 | ±5% | 225 | 49 | 100 @ 23V | 900 | -55 to 150 | SOT-23-3 | — |
| SZBZX84C30ET1G | onsemi | 30 | ±7% | 225 | 80 | 50 @ 21V | 900 | -65 to 150 | SOT-23-3 | Automotive |
| SZBZX84C30LT1G | onsemi | 30 | ±7% | 225 | 80 | 50 @ 21V | 900 | -65 to 150 | SOT-23-3 | Automotive |
Engineering Selection Recommendations
Nexperia Parametric Equivalents (BZX84-A30,215 / BZX84-B30,215 / BZX84-C30,215): These parts maintain identical electrical specifications and automotive-grade AEC-Q101 qualification as the primary part. BZX84-A30,215 offers tighter tolerance (±1%) for applications requiring higher precision. BZX84-B30,215 provides intermediate tolerance (±2%). All three are direct replacements with no design modifications required.
onsemi Automotive-Grade Alternatives (SZBZX84C30ET1G / SZBZX84C30LT1G): These parts carry automotive-grade designation and AEC-Q101 qualification, matching the primary part's compliance profile. Power rating is reduced to 225 mW, which remains acceptable for applications not requiring the full 250 mW capacity. Impedance and reverse leakage specifications are identical to the primary part.
onsemi Standard-Grade Alternatives (BZX84C30LT1G / MMBZ5256BLT1G / MMBZ5256ELT1G): These parts lack automotive-grade designation and are suitable for non-automotive applications. BZX84C30LT1G maintains 80 Ohm impedance with 225 mW power rating. MMBZ5256 series offers lower impedance (49 Ohms) with 225 mW power rating, providing improved dynamic response characteristics.
Diodes Incorporated Alternative (BZX84C30-7-F): This part offers increased power rating (300 mW) with ±7% tolerance. Reverse leakage current is elevated to 100 nA. Suitable for applications requiring higher power dissipation capacity.
Micro Commercial Co Alternative (BZX84C30-TP): This part provides the highest power rating (350 mW) with ±5% tolerance matching the primary part. Operating temperature minimum is -55°C, which is acceptable for most applications but does not extend to the full -65°C range of the primary part.
Frequently Asked Questions (FAQ)
Q: Can BZX84-A30,215 replace BZX84-C30,235 directly?
A: Yes. BZX84-A30,215 is a parametric equivalent with identical zener voltage (30 V), power rating (250 mW), impedance (80 Ohms), and operating temperature range (-65°C to 150°C). The only difference is tighter tolerance (±1% versus ±5%), which provides improved voltage accuracy. No circuit modifications are required.
Q: What is the difference between BZX84-C30,215 and BZX84-C30,235?
A: Both parts are 30 V, 250 mW Zener diodes with ±5% tolerance from NXP Semiconductors. The suffix difference (215 versus 235) indicates different packaging or supplier designations but the electrical specifications are identical. They are interchangeable.
Q: Can I use MMBZ5256BLT1G instead of BZX84-C30,235?
A: MMBZ5256BLT1G is functionally compatible with matching 30 V zener voltage, ±5% tolerance, and -65°C to 150°C operating range. However, power rating is reduced to 225 mW (versus 250 mW) and impedance is lower at 49 Ohms (versus 80 Ohms). This substitution is acceptable for applications where the lower power rating is sufficient. The lower impedance provides improved transient response.
Q: Are automotive-grade parts required for this application?
A: Automotive-grade designation (AEC-Q101) is required only if the application is for automotive use. For non-automotive applications, standard-grade alternatives such as BZX84C30LT1G or MMBZ5256BLT1G are acceptable. Verify application requirements before selecting non-automotive parts.
Q: What is the impact of tolerance differences (±1%, ±2%, ±5%, ±7%)?
A: Tolerance specifies the allowable deviation from the nominal 30 V zener voltage. Tighter tolerance (±1%) ensures the zener voltage remains closer to 30 V across the production range. Looser tolerance (±7%) allows greater variation. Select based on circuit requirements for voltage regulation accuracy. For general-purpose applications, ±5% tolerance is standard.
Q: Can BZX84C30-TP be used if the application operates at -65°C?
A: BZX84C30-TP has a minimum operating temperature of -55°C, which does not extend to -65°C. This part is not suitable for applications requiring full -65°C to 150°C operation. Use alternatives with -65°C minimum rating such as BZX84-C30,235, BZX84-A30,215, or SZBZX84C30LT1G.
Q: What does impedance (Zzt) represent and why does it matter?
A: Impedance (Zzt) is the dynamic impedance of the zener diode at the specified test current. Lower impedance indicates better voltage regulation and faster transient response. The primary part specifies 80 Ohms maximum. MMBZ5256 series offers 49 Ohms, providing superior regulation. For applications sensitive to voltage ripple or transients, lower impedance is beneficial.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the primary part BZX84-C30,235.
Q: What is the difference between TO-236AB and SOT-23-3 packaging?
A: TO-236AB and SOT-23-3 are equivalent designations for the same three-lead surface mount package. Both refer to the same physical form factor. Parts specified as TO-236-3, SC-59, or SOT-23-3 are mechanically and electrically interchangeable in the same PCB footprint.
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