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MMBZ5236B-7 Zener Diode Equivalent & Substitute Parts
Part Overview
The MMBZ5236B-7 is a 7.5 V zener diode rated for 350 mW maximum power dissipation in a surface mount SOT-23-3 package, manufactured by Diodes Incorporated. This component is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. Equivalent parts maintain identical electrical specifications and mechanical compatibility, while substitute parts provide functional equivalence within defined parameter tolerances suitable for the same circuit applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 7.5 | V |
| Tolerance | ±5 | % |
| Power - Maximum | 350 | mW |
| Impedance (Maximum) | 6 | Ohms |
| Current - Reverse Leakage @ Vr | 3 | µA @ 6 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 |
Substitute Part Grouping Explanation
Substitution of the MMBZ5236B-7 is determined by the following critical parameters: nominal zener voltage (7.5 V), maximum power rating (350 mW or higher), impedance characteristics (6 Ohms nominal), reverse leakage current, forward voltage drop, operating temperature range, and surface mount SOT-23-3 package compatibility. Parts are grouped into three categories:
Parametric Equivalents: Parts maintaining identical electrical specifications across all measured parameters, including 7.5 V nominal voltage, ±5% tolerance, 350 mW power rating, 6 Ohms impedance, and 3 µA reverse leakage at 6 V.
Manufacturer Recommended Substitutes: Parts with 7.5 V nominal voltage and SOT-23-3 package compatibility but with variations in power rating (250 mW or 350 mW), impedance (6 Ohms or 15 Ohms), reverse leakage current (1 µA or 3 µA), tolerance (±1%, ±5%, or ±6%), or operating temperature range (-55°C to 150°C or -65°C to 150°C). These parts function equivalently in circuit applications where the specified parameter variations are acceptable.
Compliance Considerations: RoHS3 compliance status and product activity status (Active vs. Discontinued) are secondary selection criteria based on regulatory and supply chain requirements.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance (%) | Power (mW) | Zzt (Ohms) | Reverse Leakage (µA) | Vf Max (mV) | Temp Range (°C) | Package | Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MMBZ5236B-7 | Diodes Incorporated | 7.5 | ±5 | 350 | 6 | 3 @ 6V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Discontinued | Non-compliant |
| MMBZ5236B-7-F | Diodes Incorporated | 7.5 | ±5 | 350 | 6 | 3 @ 6V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| BZX84-A7V5,215 | Nexperia USA Inc. | 7.5 | ±1 | 250 | 15 | 1 @ 5V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| BZX84C7V5 TR PBFREE | Central Semiconductor Corp | 7.5 | ±5 | 350 | 15 | 1 @ 5V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| BZX84C7V5-TP | Micro Commercial Co | 7.5 | ±5 | 350 | 15 | 1 @ 5V | 900 @ 10mA | -55 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| CZRT55C7V5-G | Comchip Technology | 7.5 | ±6 | 350 | 15 | 1 @ 5V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| MMBZ5236B-TP | Micro Commercial Co | 7.5 | ±5 | 350 | 6 | 3 @ 6V | 900 @ 10mA | -55 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| MMBZ5236BLT1G | onsemi | 7.5 | ±5 | 225 | 6 | 3 @ 6V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
| CMPZ5236B TR PBFREE | Central Semiconductor Corp | 7.5 | ±5 | 350 | 6 | 3 @ 6V | 900 @ 10mA | -65 to 150 | SOT-23-3 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Parametric Equivalent): MMBZ5236B-7-F is the direct parametric equivalent, maintaining all electrical specifications and operating temperature range of the original MMBZ5236B-7. This part is currently active and ROHS3 compliant, making it the primary choice for direct substitution in new designs and production.
CMPZ5236B TR PBFREE provides identical electrical parameters and operating temperature range with equivalent impedance and leakage characteristics. This part is active and ROHS3 compliant.
Functional Substitutes with Reduced Power Rating: MMBZ5236BLT1G (onsemi) maintains impedance and leakage specifications identical to the original part but with reduced maximum power rating of 225 mW versus 350 mW. This part is suitable for applications where the circuit power dissipation does not exceed 225 mW. The part is active, ROHS3 compliant, and available in high inventory quantities.
Functional Substitutes with Modified Impedance: BZX84C7V5 TR PBFREE and BZX84C7V5-TP maintain the 350 mW power rating and ±5% tolerance but feature 15 Ohms maximum impedance versus 6 Ohms in the original part, and reduced reverse leakage of 1 µA at 5 V. Both parts are active and ROHS3 compliant. BZX84C7V5-TP has a reduced operating temperature minimum of -55°C versus -65°C.
CZRT55C7V5-G provides 350 mW power rating with 15 Ohms impedance and ±6% tolerance. This part is active and ROHS3 compliant with full -65°C to 150°C operating range.
Automotive-Grade Substitute: BZX84-A7V5,215 (Nexperia) is an AEC-Q101 qualified automotive-grade part with 7.5 V nominal voltage and ±1% tolerance. Power rating is reduced to 250 mW with 15 Ohms impedance. This part is suitable for automotive applications requiring qualification documentation and is active with ROHS3 compliance.
Packaging Considerations: MMBZ5236B-TP is supplied in Tape & Reel format with identical electrical specifications to the original part except for reduced operating temperature minimum of -55°C. This part is active and ROHS3 compliant.
Frequently Asked Questions (FAQ)
Q: Can MMBZ5236BLT1G be used as a direct replacement for MMBZ5236B-7?
A: MMBZ5236BLT1G is functionally compatible for applications where maximum power dissipation does not exceed 225 mW. The part maintains identical nominal voltage (7.5 V), tolerance (±5%), impedance (6 Ohms), reverse leakage (3 µA @ 6 V), and operating temperature range (-65°C to 150°C). If circuit power dissipation exceeds 225 mW, this part is not suitable.
Q: What is the difference between MMBZ5236B-7-F and MMBZ5236B-7?
A: MMBZ5236B-7-F is the active production equivalent of the discontinued MMBZ5236B-7. Both parts maintain identical electrical specifications: 7.5 V nominal voltage, ±5% tolerance, 350 mW power rating, 6 Ohms impedance, 3 µA reverse leakage, and -65°C to 150°C operating range. The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 Compliant vs. Non-compliant).
Q: Are parts with 15 Ohms impedance compatible with circuits designed for 6 Ohms impedance?
A: Parts with 15 Ohms impedance (BZX84C7V5 TR PBFREE, BZX84C7V5-TP, CZRT55C7V5-G) maintain the same nominal zener voltage and power rating but exhibit different dynamic impedance characteristics. These parts are functionally compatible in most circuit applications but may exhibit different transient response and voltage regulation characteristics. Circuit validation is required for applications with stringent voltage regulation requirements.
Q: Can BZX84-A7V5,215 be used in non-automotive applications?
A: BZX84-A7V5,215 is an automotive-grade part with AEC-Q101 qualification. While the part can be used in non-automotive applications, it features reduced power rating (250 mW versus 350 mW) and increased impedance (15 Ohms versus 6 Ohms). Selection should be based on circuit power dissipation requirements and voltage regulation specifications rather than automotive qualification status.
Q: What is the significance of the operating temperature range difference between -55°C and -65°C?
A: BZX84C7V5-TP and MMBZ5236B-TP have minimum operating temperatures of -55°C, while MMBZ5236B-7, MMBZ5236B-7-F, BZX84-A7V5,215, CZRT55C7V5-G, MMBZ5236BLT1G, and CMPZ5236B TR PBFREE operate to -65°C. For applications requiring operation below -55°C, parts with -65°C minimum temperature must be selected.
Q: Are all substitute parts RoHS3 compliant?
A: All active substitute parts listed (MMBZ5236B-7-F, BZX84-A7V5,215, BZX84C7V5 TR PBFREE, BZX84C7V5-TP, CZRT55C7V5-G, MMBZ5236B-TP, MMBZ5236BLT1G, CMPZ5236B TR PBFREE) are ROHS3 compliant. The original MMBZ5236B-7 is RoHS non-compliant and discontinued.
Q: What packaging formats are available for these zener diodes?
A: Parts are available in Tape & Reel (TR) format for production quantities and Cut Tape (CT) with Digi-Reel format for smaller quantities. MMBZ5236BLT1G is available in Cut Tape & Digi-Reel format with 179,100 pieces in stock. Most other parts are available in Tape & Reel format suitable for automated assembly.
Q: How do tolerance specifications affect circuit performance?
A: Zener voltage tolerance directly impacts voltage regulation accuracy. MMBZ5236B-7 and most substitutes feature ±5% tolerance, while BZX84-A7V5,215 offers tighter ±1% tolerance and CZRT55C7V5-G offers ±6% tolerance. For applications requiring precise voltage regulation, BZX84-A7V5,215 with ±1% tolerance is preferred. For general-purpose applications, ±5% and ±6% tolerance parts are functionally equivalent.
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