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MMBZ5237B Equivalent & Substitute Parts
Part Overview
The MMBZ5237B is a Zener diode manufactured by onsemi, rated at 8.2 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
The MMBZ5237B serves voltage regulation and protection applications requiring precise 8.2 V reference voltage with ±5% tolerance. Substitute parts must maintain electrical compatibility across voltage regulation, power dissipation, impedance, and thermal operating ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 8.2 | V |
| Tolerance | ±5% | — |
| Power - Max | 350 | mW |
| Impedance (Max) | 8 | Ohms |
| Current - Reverse Leakage @ Vr | 3 | µA @ 6.5 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 of the MMBZ5237B is determined by the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - Zener (Nom): 8.2 V (exact match required)
- Tolerance: ±5% or tighter (±1% acceptable)
- Power - Max: 350 mW or greater
- Impedance (Max): 8 Ohms or lower
- Current - Reverse Leakage @ Vr: 3 µA @ 6.5 V or lower
- Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (exact match)
- Operating Temperature: -55°C to 150°C minimum (extended ranges acceptable)
- Package / Case: TO-236-3, SC-59, SOT-23-3 (pin-compatible)
Substitution Categories:
Direct Equivalents maintain all electrical parameters identical to the MMBZ5237B while offering active product status and improved availability.
Similar Substitutes provide reduced power dissipation (225 mW) with identical voltage and impedance specifications. These are suitable for applications where the full 350 mW rating is not required.
Automotive-Grade Substitutes include AEC-Q101 qualification and extended temperature ranges (-65°C to 150°C), providing enhanced reliability for automotive and industrial applications.
Alternative Manufacturer Substitutes from Central Semiconductor Corp and Nexperia USA Inc. maintain core electrical specifications with variations in impedance and leakage current within acceptable ranges.
Parameter Comparison
| Part Number | Manufacturer | Vz (V) | Tolerance | Power (mW) | Zzt (Ohms) | Ir @ Vr (µA) | Vf (mV) | Temp Range (°C) | Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|
| MMBZ5237B | onsemi | 8.2 | ±5% | 350 | 8 | 3 @ 6.5V | 900 @ 10mA | -55 to 150 | Obsolete | — |
| MMBZ5237BLT1G | onsemi | 8.2 | ±5% | 225 | 8 | 3 @ 6.5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| SZBZX84C8V2LT1G | onsemi | 8.2 | ±5% | 225 | 15 | 0.7 @ 5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| SZMMBZ5237BLT1G | onsemi | 8.2 | ±5% | 225 | 8 | 3 @ 6.5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| CMPZ5237B TR PBFREE | Central Semiconductor Corp | 8.2 | ±5% | 350 | 8 | 3 @ 6.5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| MMBZ5237B-7-F | Diodes Incorporated | 8.2 | ±5% | 350 | 8 | 3 @ 6.5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| MMBZ5237BQ-13-F | Diodes Incorporated | 8.2 | ±5% | 350 | 8 | 3 @ 6.5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| MMBZ5237BQ-7-F | Diodes Incorporated | 8.2 | ±5% | 350 | 8 | 3 @ 6.5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| BZX84-A8V2,215 | Nexperia USA Inc. | 8.2 | ±1% | 250 | 15 | 0.7 @ 5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| BZX84C8V2 TR | Central Semiconductor Corp | 8.2 | ±5% | 350 | 15 | 0.7 @ 5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
| BZX84C8V2-7-F | Diodes Incorporated | 8.2 | ±6% | 300 | 15 | 0.7 @ 5V | 900 @ 10mA | -65 to 150 | Active | ROHS3 |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical Performance):
MMBZ5237B-7-F (Diodes Incorporated) and MMBZ5237BQ-7-F (Diodes Incorporated) provide complete electrical equivalence with active product status and ROHS3 compliance. Both maintain 350 mW power rating, 8 Ohm impedance, and -65°C to 150°C operating range. These parts are recommended for applications requiring no design modification.
CMPZ5237B TR PBFREE (Central Semiconductor Corp) offers identical electrical specifications with active status and ROHS3 compliance, providing an alternative source for direct substitution.
For Automotive and Extended Temperature Applications:
SZMMBZ5237BLT1G (onsemi) and MMBZ5237BQ-13-F (Diodes Incorporated) include AEC-Q101 automotive qualification with -65°C to 150°C operating range. These parts are suitable for automotive, industrial, and mission-critical applications requiring enhanced reliability certification.
For Power-Constrained Applications:
MMBZ5237BLT1G (onsemi) and SZMMBZ5237BLT1G (onsemi) reduce power dissipation to 225 mW while maintaining 8.2 V nominal voltage and ±5% tolerance. These substitutes are applicable where thermal management or power budget constraints permit reduced power ratings.
For Tighter Voltage Tolerance:
BZX84-A8V2,215 (Nexperia USA Inc.) provides ±1% voltage tolerance with AEC-Q101 qualification, suitable for precision voltage reference applications requiring tighter tolerance than the original ±5% specification.
For Alternative Impedance Characteristics:
SZBZX84C8V2LT1G (onsemi), BZX84C8V2 TR (Central Semiconductor Corp), and BZX84C8V2-7-F (Diodes Incorporated) feature 15 Ohm impedance with reduced reverse leakage current (0.7 µA @ 5V). These parts are suitable for low-leakage applications where impedance variation is acceptable.
Frequently Asked Questions (FAQ)
Q: Can MMBZ5237BLT1G replace MMBZ5237B in all applications?
A: MMBZ5237BLT1G maintains identical voltage (8.2 V), tolerance (±5%), impedance (8 Ohms), and forward voltage specifications. The primary difference is reduced power dissipation (225 mW versus 350 mW). Substitution is valid only if the application does not require the full 350 mW power rating. Verify circuit power dissipation requirements before substitution.
Q: What is the difference between MMBZ5237B-7-F and MMBZ5237BQ-7-F?
A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications (8.2 V, ±5%, 350 mW, 8 Ohm impedance). MMBZ5237BQ-7-F includes AEC-Q101 automotive qualification and is designated for automotive applications. MMBZ5237B-7-F is suitable for general industrial and commercial applications. Both are direct electrical equivalents.
Q: Why do some substitutes have 15 Ohm impedance instead of 8 Ohm?
A: Impedance variation reflects different semiconductor manufacturing processes and die designs. Parts with 15 Ohm impedance (SZBZX84C8V2LT1G, BZX84C8V2 TR, BZX84C8V2-7-F) maintain the 8.2 V nominal voltage but exhibit different dynamic impedance characteristics. These parts are suitable for applications where impedance variation within the specified range does not affect circuit performance. Verify impedance requirements in voltage regulation circuits before substitution.
Q: Can BZX84-A8V2,215 be used as a direct replacement?
A: BZX84-A8V2,215 maintains 8.2 V nominal voltage and SOT-23-3 package compatibility. However, it differs in three parameters: ±1% tolerance (tighter than ±5%), 250 mW power rating (lower than 350 mW), and 15 Ohm impedance (higher than 8 Ohm). Substitution is valid only if the application tolerates these parameter variations. The tighter tolerance may improve voltage regulation precision in some circuits.
Q: What is the significance of AEC-Q101 qualification?
A: AEC-Q101 qualification indicates the part meets automotive industry reliability standards for discrete semiconductors. Parts with AEC-Q101 certification (SZBZX84C8V2LT1G, SZMMBZ5237BLT1G, MMBZ5237BQ-13-F, MMBZ5237BQ-7-F, BZX84-A8V2,215) are suitable for automotive, industrial, and high-reliability applications. Non-qualified parts are suitable for commercial and general industrial applications.
Q: Are all substitute parts ROHS3 compliant?
A: All active substitute parts listed are ROHS3 compliant. The original MMBZ5237B does not specify RoHS status due to its obsolete classification. ROHS3 compliance ensures lead-free construction and compliance with environmental regulations.
Q: What packaging formats are available for these substitutes?
A: All substitute parts use SOT-23-3 (TO-236-3, SC-59) surface mount package, maintaining pin compatibility with the original MMBZ5237B. Packaging formats vary: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and bulk quantities. Select packaging based on procurement and assembly requirements.
Q: Can CMPZ5237B TR PBFREE be used in place of MMBZ5237B?
A: Yes. CMPZ5237B TR PBFREE (Central Semiconductor Corp) provides complete electrical equivalence with 8.2 V nominal, ±5% tolerance, 350 mW power rating, and 8 Ohm impedance. It is active, ROHS3 compliant, and operates across -65°C to 150°C. This part is a direct substitute requiring no design modification.
Q: What is the operating temperature difference between MMBZ5237B and its substitutes?
A: The original MMBZ5237B operates from -55°C to 150°C. Most active substitutes extend the lower temperature limit to -65°C, providing 10°C additional cold-temperature margin. This extended range does not affect substitution compatibility; applications operating within -55°C to 150°C remain fully compatible with extended-range substitutes.
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