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MMBZ5229B-TP Zener Diode Equivalent & Substitute Parts
Part Overview
The MMBZ5229B-TP is a 4.3 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and operational parameters. Alternative sources and variants are necessary to ensure supply chain flexibility, accommodate different packaging formats, and address specific application requirements such as extended temperature ranges or alternative tolerance specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 4.3 | V |
| Tolerance | ±5% | — |
| Power - Maximum | 350 | mW |
| Impedance (Maximum) | 22 | Ohms |
| Current - Reverse Leakage @ Vr | 5 | µA @ 1 V |
| Voltage - Forward (Maximum) @ If | 900 | mV @ 10 mA |
| Operating Temperature Range | -55 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts are classified into two categories based on electrical and mechanical compatibility with the MMBZ5229B-TP:
Upgrade Substitutes maintain identical or superior electrical specifications and are direct functional replacements:
- Zener voltage: 4.3 V nominal
- Tolerance: ±5%
- Power rating: 350 mW
- Impedance: 22 Ohms
- Package: SOT-23 or SOT-23-3 (mechanically compatible)
- Operating temperature: -65°C to 150°C (extended lower limit)
Similar Substitutes share the core 4.3 V Zener voltage and SOT-23 package but differ in one or more secondary parameters:
- Power dissipation: 225 mW to 300 mW (reduced from 350 mW)
- Impedance: 90 Ohms (increased from 22 Ohms)
- Tolerance: ±7% (relaxed from ±5%)
- Reverse leakage: 3 µA @ 1 V (improved from 5 µA @ 1 V)
- Package variants: SOT-363 (array configuration)
All substitute parts maintain SOT-23 surface mount compatibility, ROHS3 compliance, and the specified forward voltage characteristic of 900 mV @ 10 mA.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power Max (mW) | Zzt (Ohms) | Ir @ 1V (µA) | Temp Range (°C) | Package | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|
| MMBZ5229B-TP | Micro Commercial Co | 4.3 | ±5% | 350 | 22 | 5 | -55 to 150 | SOT-23-3 | Tape & Reel |
| CMPZ5229B TR PBFREE | Central Semiconductor Corp | 4.3 | ±5% | 350 | 22 | 5 | -65 to 150 | SOT-23-3 | Cut Tape |
| MMBZ5229B-7-F | Diodes Incorporated | 4.3 | ±5% | 350 | 22 | 5 | -65 to 150 | SOT-23-3 | Tape & Reel |
| BZX84C4V3 TR PBFREE | Central Semiconductor Corp | 4.3 | ±5% | 350 | 90 | 3 | -65 to 150 | SOT-23 | Tape & Reel |
| BZX84C4V3-E3-08 | Vishay General Semiconductor | 4.3 | ±5% | 300 | 90 | 3 | -55 to 150 | SOT-23-3 | Tape & Reel |
| BZX84C4V3-E3-18 | Vishay General Semiconductor | 4.3 | ±5% | 300 | 90 | 3 | -55 to 150 | SOT-23-3 | Tape & Reel |
| BZX84C4V3LT1G | onsemi | 4.3 | ±7% | 225 | 90 | 3 | -65 to 150 | SOT-23-3 | Cut Tape & Digi-Reel |
| BZX84C4V3LT3G | onsemi | 4.3 | ±7% | 225 | 90 | 3 | -65 to 150 | SOT-23-3 | Tape & Reel |
| MMBZ5229BLT1G | onsemi | 4.3 | ±5% | 225 | 22 | 5 | -65 to 150 | SOT-23-3 | Tape & Reel |
| MMBZ5229BTS-7-F | Diodes Incorporated | 4.3 | ±5% | 200 | 22 | 5 | -65 to 150 | SOT-363 | Tape & Reel |
| SZBZX84C4V3ET1G | onsemi | 4.3 | ±7% | 225 | 90 | 3 | -65 to 150 | SOT-23-3 | Tape & Reel |
Engineering Selection Recommendations
Direct Upgrade Substitutes (Recommended for 1:1 replacement):
CMPZ5229B TR PBFREE and MMBZ5229B-7-F are functionally equivalent to the MMBZ5229B-TP with identical electrical specifications (4.3 V, ±5%, 350 mW, 22 Ohms impedance). Both are ROHS3 compliant and Active status. MMBZ5229B-7-F extends the lower operating temperature to -65°C, providing enhanced thermal margin. CMPZ5229B TR PBFREE is supplied in Cut Tape format, suitable for applications requiring alternative packaging logistics.
Compatible Substitutes (Suitable for applications with relaxed power or impedance requirements):
BZX84C4V3 TR PBFREE maintains 350 mW power rating and 4.3 V Zener voltage but features 90 Ohms impedance and 3 µA reverse leakage. This part is suitable for circuits where higher impedance and lower leakage current are acceptable or beneficial. Extended temperature range (-65°C to 150°C) is provided.
BZX84C4V3-E3-08 and BZX84C4V3-E3-18 are Vishay variants with reduced power rating (300 mW) and higher impedance (90 Ohms). These are suitable for lower-power applications where the 350 mW rating exceeds circuit requirements.
Reduced Power Variants (For applications with lower power dissipation requirements):
MMBZ5229BLT1G (onsemi) maintains the 22 Ohms impedance and ±5% tolerance of the original part but reduces power to 225 mW. This variant is suitable for circuits operating below 225 mW and provides extended temperature range (-65°C to 150°C).
BZX84C4V3LT1G and BZX84C4V3LT3G (onsemi) offer 225 mW power rating with 90 Ohms impedance and ±7% tolerance. These are suitable for applications where impedance characteristics of the BZX84 series are preferred.
Array Configuration (For multi-channel applications):
MMBZ5229BTS-7-F is a 3-independent Zener diode array in SOT-363 package, suitable for applications requiring multiple 4.3 V Zener channels in a compact footprint. Power per channel is 200 mW.
Automotive Grade Option:
SZBZX84C4V3ET1G (onsemi) is AEC-Q101 qualified for automotive applications, with 225 mW power rating, 90 Ohms impedance, and ±7% tolerance.
All recommended substitutes maintain ROHS3 compliance and Active product status.
Frequently Asked Questions (FAQ)
Q: Can MMBZ5229B-TP be replaced with BZX84C4V3 TR PBFREE?
A: Yes. Both parts share identical 4.3 V Zener voltage, ±5% tolerance, 350 mW power rating, and SOT-23 package compatibility. The BZX84C4V3 variant features 90 Ohms impedance compared to 22 Ohms in the original part, and improved reverse leakage (3 µA vs. 5 µA). This substitution is suitable for applications where higher impedance does not compromise circuit performance.
Q: What is the difference between MMBZ5229B-7-F and CMPZ5229B TR PBFREE?
A: Both are direct electrical equivalents with 4.3 V, ±5%, 350 mW, and 22 Ohms specifications. MMBZ5229B-7-F is manufactured by Diodes Incorporated and supplied in Tape & Reel format. CMPZ5229B TR PBFREE is manufactured by Central Semiconductor Corp and supplied in Cut Tape format. The primary difference is packaging logistics and manufacturer sourcing.
Q: Can I use BZX84C4V3-E3-08 in place of MMBZ5229B-TP?
A: Conditional substitution. BZX84C4V3-E3-08 maintains the 4.3 V Zener voltage and ±5% tolerance but reduces power rating from 350 mW to 300 mW. This substitution is valid only if circuit power dissipation does not exceed 300 mW. The higher impedance (90 Ohms) and lower reverse leakage (3 µA) may improve circuit stability in some applications.
Q: What is the advantage of MMBZ5229BLT1G over the original MMBZ5229B-TP?
A: MMBZ5229BLT1G maintains identical electrical characteristics (4.3 V, ±5%, 22 Ohms impedance, 5 µA reverse leakage) but reduces power rating to 225 mW. The primary advantage is extended lower operating temperature (-65°C vs. -55°C). This variant is suitable for low-power applications requiring enhanced cold-temperature performance.
Q: Is MMBZ5229BTS-7-F a direct replacement for MMBZ5229B-TP?
A: No. MMBZ5229BTS-7-F is a 3-independent Zener diode array in SOT-363 package, not a single-diode component. It is suitable only for applications requiring multiple independent 4.3 V Zener channels. The SOT-363 package is not mechanically compatible with SOT-23 footprints.
Q: Can I substitute SZBZX84C4V3ET1G for automotive applications?
A: Yes. SZBZX84C4V3ET1G is AEC-Q101 qualified for automotive use, with 4.3 V Zener voltage, ±7% tolerance, 225 mW power rating, and 90 Ohms impedance. This substitution is valid for automotive circuits where the relaxed tolerance and reduced power rating are acceptable.
Q: What does ±7% tolerance mean compared to ±5%?
A: Tolerance specifies the allowable deviation from the nominal 4.3 V Zener voltage. ±5% tolerance allows deviation from 4.085 V to 4.515 V. ±7% tolerance allows deviation from 3.999 V to 4.601 V. Parts with ±7% tolerance provide wider voltage variation and are suitable for applications with less stringent voltage regulation requirements.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements equivalent to the original MMBZ5229B-TP.
Q: What is the difference between Tape & Reel and Cut Tape packaging?
A: Tape & Reel packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape packaging supplies components on tape segments, suitable for lower-volume or manual assembly operations. Both formats contain identical components; the difference is logistics and handling.
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