Request Quote
(Ships tomorrow)
MMQA20VT3G Transient Voltage Suppressor Diode - Equivalent & Substitute Parts
Part Overview
The MMQA20VT3G is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with 28.6V maximum clamping voltage and 840mA peak pulse current capability in an SC-74 package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MMQA20VT3G |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 4 |
| Voltage - Reverse Standoff (Typ) | 15V (Max) |
| Voltage - Breakdown (Min) | 19V |
| Voltage - Clamping (Max) @ Ipp | 28.6V |
| Current - Peak Pulse (10/1000µs) | 840mA (8/20µs) |
| 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 |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the MMQA20VT3G is determined by the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - Reverse Standoff: 15V maximum
- Voltage - Clamping (Max) @ Ipp: 28.6V nominal
- Current - Peak Pulse (8/20µs): 840mA nominal
- Unidirectional Channels: 4
- Package / Case: SC-74 or SOT-457 compatible
- Mounting Type: Surface Mount
- Operating Temperature Range: -55°C to 150°C minimum
Direct Equivalent: The MMQA20VT1G from onsemi is a direct functional equivalent with identical electrical specifications. The primary difference is packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete).
Similar Alternatives: The BZA420A series (Nexperia USA Inc.) and BZA456A series provide alternative voltage protection characteristics. These parts share the same package footprint and surface-mount compatibility but operate at different voltage levels. The BZA420A series maintains a 20V reverse standoff with 28V clamping, while the BZA456A series operates at 5.6V reverse standoff with 8V clamping. Selection between these alternatives depends on the specific circuit voltage requirements.
Parameter Comparison
| Parameter | MMQA20VT3G | MMQA20VT1G | 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. |
| Voltage - Reverse Standoff (Typ) | 15V | 15V | 20V | 20V | 20V | 20V | 5.6V | 5.6V | 5.6V | 5.6V |
| Voltage - Clamping (Max) @ Ipp | 28.6V | 28.6V | 28V | 28V | 28V | 28V | 8V | 8V | 8V | 8V |
| Unidirectional Channels | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| 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 |
| 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 |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
First Choice - Direct Equivalent: The MMQA20VT1G from onsemi is the recommended primary substitute. This part maintains identical electrical specifications to the MMQA20VT3G while offering active product status and ROHS3 compliance. The only functional difference is packaging format (Tape & Reel), which does not affect circuit performance. This part is currently in stock with 7,270 units available.
Alternative Selection - Nexperia BZA420A Series: The BZA420A series (available in variants BZA420A,115; BZA420A,125; BZA420A,135; BZA420A,165) provides an alternative from an established manufacturer with automotive-grade qualification (AEC-Q100). These parts operate at 20V reverse standoff with 28V clamping, representing a 5V higher standoff voltage compared to the MMQA20VT3G. Selection of this series is appropriate for applications requiring higher voltage margin or automotive-grade reliability. All variants are ROHS3 compliant and currently in stock.
Alternative Selection - Nexperia BZA456A Series: The BZA456A series (available in variants BZA456A,115; BZA456A,125; BZA456A,135; BZA456A,165) operates at significantly lower voltage levels (5.6V reverse standoff, 8V clamping) with higher peak pulse current capability (3A). This series is suitable only for applications protecting lower-voltage circuits and is not a direct substitute for 15V standoff applications. All variants are ROHS3 compliant and currently in stock.
Frequently Asked Questions (FAQ)
Q: Can MMQA20VT1G be used as a direct replacement for MMQA20VT3G? A: Yes. The MMQA20VT1G is electrically identical to the MMQA20VT3G with matching voltage ratings (15V standoff, 28.6V clamping), current ratings (840mA peak pulse), and operating temperature range (-55°C to 150°C). The difference is packaging format and product status. MMQA20VT1G is available in Tape & Reel format and maintains active product status.
Q: What is the difference between the onsemi MMQA20VT1G and Nexperia BZA420A series? A: The MMQA20VT1G maintains the original 15V reverse standoff specification. The BZA420A series operates at 20V reverse standoff with 28V clamping voltage. The 5V difference in standoff voltage affects circuit protection thresholds. BZA420A parts include automotive-grade qualification (AEC-Q100), while MMQA20VT1G does not specify automotive qualification.
Q: Are the BZA456A parts suitable replacements for MMQA20VT3G? A: No. The BZA456A series operates at 5.6V reverse standoff with 8V clamping voltage, which is incompatible with circuits designed for 15V standoff protection. These parts are suitable only for lower-voltage protection applications.
Q: What are the package compatibility considerations? A: The MMQA20VT3G and MMQA20VT1G use SC-74 (SOT-457) packaging. The Nexperia BZA420A and BZA456A series use 6-TSOP packaging. While both are surface-mount packages, PCB footprints differ. Physical layout verification is required before substitution.
Q: Do all substitute parts meet RoHS compliance? A: The MMQA20VT1G and all Nexperia BZA series variants are ROHS3 compliant. The original MMQA20VT3G does not specify RoHS status. For applications requiring RoHS compliance, MMQA20VT1G or Nexperia alternatives are appropriate selections.
Q: What inventory levels are available for each substitute? A: MMQA20VT1G: 7,270 units. BZA420A,115: 12,150 units. BZA420A,125: 6,964 units. BZA420A,135: 731 units. BZA420A,165: 1,138 units. BZA456A,115: 15,300 units. BZA456A,125: 797 units. BZA456A,135: 11,091 units. BZA456A,165: 11,117 units.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts