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MMQA33VT1 Equivalent & Substitute Parts
Part Overview
The MMQA33VT1 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component features a 25V reverse standoff voltage with a 48.6V clamping voltage and 504mA peak pulse current rating in an SC-74 surface mount package. The MMQA33VT1 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MMQA33VT1 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 4 |
| Voltage - Reverse Standoff (Typ) | 25V (Max) |
| Voltage - Breakdown (Min) | 31.4V |
| Voltage - Clamping (Max) @ Ipp | 48.6V |
| Current - Peak Pulse (8/20µs) | 504mA |
| Power - Peak Pulse | 150W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | SC-74, SOT-457 |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the MMQA33VT1 is determined by the following critical parameters:
Primary Substitution Criteria:
- Unidirectional channel configuration (4 channels required)
- Voltage - Reverse Standoff rating (25V maximum)
- Voltage - Clamping specification (48.6V maximum @ Ipp)
- Current - Peak Pulse capability (504mA @ 8/20µs)
- Power - Peak Pulse dissipation (150W)
- Surface mount package compatibility (SC-74 / SOT-457)
- Operating temperature range (-55°C ~ 150°C minimum)
Direct Equivalent: The MMQA33VT1G is the active production equivalent from onsemi, maintaining identical electrical specifications and package configuration while offering improved RoHS3 compliance and active product status.
Similar Alternatives: The Nexperia BZA420A and BZA456A series parts are listed as similar alternatives. However, these components exhibit different voltage and current ratings that deviate from the MMQA33VT1 specifications. The BZA420A series operates at 20V reverse standoff with 28V clamping, while the BZA456A series operates at 5.6V reverse standoff with 8V clamping. These parts are suitable only for applications with lower voltage protection requirements.
Parameter Comparison
| Parameter | MMQA33VT1 | MMQA33VT1G | BZA420A,115 | BZA420A,125 | BZA420A,135 | BZA420A,165 | BZA456A,115 | BZA456A,125 | BZA456A,135 | BZA456A,165 |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. | Nexperia USA Inc. |
| Type | Zener | Zener | Zener | Zener | Zener | Zener | Zener | Zener | Zener | Zener |
| Unidirectional Channels | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Voltage - Reverse Standoff (Typ) | 25V | 25V | 20V | 20V | 20V | 20V | 5.6V | 5.6V | 5.6V | 5.6V |
| Voltage - Clamping (Max) @ Ipp | 48.6V | 48.6V | 28V | 28V | 28V | 28V | 8V | 8V | 8V | 8V |
| Current - Peak Pulse (8/20µs) | 504mA | 504mA | — | — | — | — | 3A | 3A | 3A | 3A |
| Power - Peak Pulse | 150W | 150W | 19.6W | 19.6W | 19.6W | 19.6W | 24W | 24W | 24W | 24W |
| Operating Temperature Range | -55°C ~ 150°C | -55°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C | -65°C ~ 150°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | SC-74, SOT-457 | SC-74, SOT-457 | 6-TSOP | 6-TSOP | 6-TSOP | 6-TSOP | 6-TSOP | 6-TSOP | 6-TSOP | 6-TSOP |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Recommended Primary Substitute: MMQA33VT1G
The MMQA33VT1G is the direct active equivalent from onsemi. This part maintains 100% electrical and mechanical compatibility with the obsolete MMQA33VT1, including identical voltage ratings (25V reverse standoff, 48.6V clamping), current specifications (504mA peak pulse), and SC-74 package configuration. The MMQA33VT1G offers improved product status (active production) and ROHS3 compliance, making it the preferred choice for new designs and production continuity.
Alternative Consideration: Nexperia BZA420A Series
The BZA420A series (BZA420A,115 / BZA420A,125 / BZA420A,135 / BZA420A,165) represents an alternative from a different manufacturer. These parts operate at reduced voltage ratings (20V reverse standoff, 28V clamping) compared to the MMQA33VT1 specification. Selection of BZA420A parts is appropriate only for applications where the lower voltage protection threshold is acceptable. These parts carry active product status and ROHS3 compliance with automotive-grade qualification (AEC-Q100).
Alternative Consideration: Nexperia BZA456A Series
The BZA456A series (BZA456A,115 / BZA456A,125 / BZA456A,135 / BZA456A,165) operates at significantly lower voltage ratings (5.6V reverse standoff, 8V clamping) with higher peak pulse current capability (3A). These parts are suitable only for low-voltage protection applications and are not electrically equivalent to the MMQA33VT1. These parts carry active product status and ROHS3 compliance with automotive-grade qualification (AEC-Q100).
Frequently Asked Questions (FAQ)
Q: Can MMQA33VT1G be used as a direct replacement for MMQA33VT1?
A: Yes. The MMQA33VT1G is the active production equivalent with identical electrical specifications, voltage ratings, current ratings, and SC-74 package configuration. It is a direct pin-for-pin and functional replacement.
Q: What is the primary difference between MMQA33VT1 and MMQA33VT1G?
A: The MMQA33VT1G is the active production version with ROHS3 compliance, while the MMQA33VT1 is obsolete and RoHS non-compliant. Electrical and mechanical specifications are identical.
Q: Can BZA420A parts replace MMQA33VT1?
A: BZA420A parts are not direct replacements. They operate at 20V reverse standoff and 28V clamping voltage, compared to the MMQA33VT1's 25V reverse standoff and 48.6V clamping. Use BZA420A only if your application requires lower voltage protection thresholds.
Q: Can BZA456A parts replace MMQA33VT1?
A: BZA456A parts are not suitable replacements. They operate at 5.6V reverse standoff and 8V clamping voltage, designed for low-voltage protection applications. These parts are electrically incompatible with MMQA33VT1 specifications.
Q: Are there package compatibility issues between MMQA33VT1 and Nexperia alternatives?
A: Yes. The MMQA33VT1 uses SC-74 (SOT-457) package, while Nexperia BZA420A and BZA456A series use 6-TSOP package. Physical package differences require PCB layout modifications and may not be pin-compatible.
Q: What certifications do the substitute parts carry?
A: MMQA33VT1G carries ROHS3 compliance. Nexperia BZA420A and BZA456A series carry ROHS3 compliance and automotive-grade qualification (AEC-Q100).
Q: Is the operating temperature range a factor in substitution?
A: The MMQA33VT1 operates from -55°C to 150°C. MMQA33VT1G maintains this range. Nexperia alternatives operate from -65°C to 150°C, providing extended low-temperature capability. Both ranges are compatible for most applications.
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