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MMQA22VT1G Equivalent & Substitute Parts
Part Overview
The MMQA22VT1G is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 17V reverse standoff voltage with 31.7V maximum clamping voltage and 758mA peak pulse current (8/20µs). The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MMQA22VT1G |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 4 |
| Voltage - Reverse Standoff (Typ) | 17V (Max) |
| Voltage - Breakdown (Min) | 20.9V |
| Voltage - Clamping (Max) @ Ipp | 31.7V |
| Current - Peak Pulse (10/1000µs) | 758mA (8/20µs) |
| Power - Peak Pulse | 150W |
| Operating Temperature | -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 for the MMQA22VT1G is determined by the following critical electrical and mechanical parameters:
Primary Substitution Criteria:
- Unidirectional channels: 4 (required for pin-compatible replacement)
- Voltage - Reverse Standoff: 17V nominal operation range
- Voltage - Clamping (Max) @ Ipp: 31.7V maximum allowable
- Current - Peak Pulse (8/20µs): 758mA minimum capability
- Power - Peak Pulse: 150W minimum dissipation
- Mounting Type: Surface Mount
- Package compatibility: SC-74 or SOT-457 footprint
The substitute parts are grouped into two categories based on electrical performance alignment:
Group A - Direct Voltage Range Substitutes (BZA420A series): BZA420A,115 | BZA420A,125 | BZA420A,135 | BZA420A,165
These parts maintain 20V reverse standoff voltage with 28V clamping voltage, operating within acceptable tolerance for 17V-rated applications. All variants share identical electrical specifications across packaging variants.
Group B - Lower Voltage Substitutes (BZA456A series): BZA456A,115 | BZA456A,125 | BZA456A,135 | BZA456A,165
These parts operate at 5.6V reverse standoff with 8V clamping voltage, suitable only for lower-voltage protection circuits. Peak pulse current reaches 3A (8/20µs), exceeding the original specification.
Group C - Alternative Manufacturer (ESDA25SC6): STMicroelectronics ESDA25SC6 operates at 24V reverse standoff with 25V breakdown voltage and 300W peak pulse power, providing higher performance margin for 17V applications.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Clamping (Max) @ Ipp (V) | Peak Pulse Current (8/20µs) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| MMQA22VT1G | onsemi | 17 | 31.7 | 758mA | 150 | -55 ~ 150 | SC-74 | Obsolete |
| BZA420A,115 | Nexperia USA Inc. | 20 | 28 | — | 19.6 | -65 ~ 150 | 6-TSOP | Active |
| BZA420A,125 | Nexperia USA Inc. | 20 | 28 | — | 19.6 | -65 ~ 150 | 6-TSOP | Active |
| BZA420A,135 | Nexperia USA Inc. | 20 | 28 | — | 19.6 | -65 ~ 150 | 6-TSOP | Active |
| BZA420A,165 | Nexperia USA Inc. | 20 | 28 | — | 19.6 | -65 ~ 150 | 6-TSOP | Active |
| BZA456A,115 | Nexperia USA Inc. | 5.6 | 8 | 3A | 24 | -65 ~ 150 | 6-TSOP | Active |
| BZA456A,125 | Nexperia USA Inc. | 5.6 | 8 | 3A | 24 | -65 ~ 150 | 6-TSOP | Active |
| BZA456A,135 | Nexperia USA Inc. | 5.6 | 8 | 3A | 24 | -65 ~ 150 | 6-TSOP | Active |
| BZA456A,165 | Nexperia USA Inc. | 5.6 | 8 | 3A | 24 | -65 ~ 150 | 6-TSOP | Active |
| ESDA25SC6 | STMicroelectronics | 24 | — | — | 300 | -40 ~ 125 | SOT-23-6 | Active |
Engineering Selection Recommendations
For Active Production (Recommended Primary Substitutes):
The BZA420A series (all variants: ,115, ,125, ,135, ,165) from Nexperia USA Inc. are the preferred substitutes for MMQA22VT1G applications. These parts are active products with AEC-Q100 automotive qualification and ROHS3 compliance. The 20V reverse standoff voltage and 28V clamping voltage provide operation within acceptable margins for 17V-rated circuits. All BZA420A variants share identical electrical specifications; packaging variants (,115, ,125, ,135, ,165) indicate different tape reel configurations for manufacturing processes.
For Lower-Voltage Applications:
The BZA456A series (all variants: ,115, ,125, ,135, ,165) operates at 5.6V reverse standoff with 8V clamping voltage. These parts are suitable only for circuits requiring lower voltage protection thresholds and are not direct replacements for 17V applications.
For Higher-Performance Requirements:
The ESDA25SC6 from STMicroelectronics provides 24V reverse standoff voltage with 300W peak pulse power, offering increased performance margin. This part operates at a reduced temperature range (-40°C to 125°C) compared to the original specification (-55°C to 150°C). The SOT-23-6 package differs from the SC-74 footprint, requiring PCB layout modification.
Compliance and Status:
All recommended substitutes carry active product status with current manufacturing support. The BZA420A series includes AEC-Q100 automotive qualification, suitable for automotive and industrial applications. All parts maintain MSL 1 (Unlimited) moisture sensitivity and REACH compliance.
Frequently Asked Questions (FAQ)
Q: Can BZA420A series parts directly replace MMQA22VT1G without PCB modification?
A: The BZA420A series uses a 6-TSOP package, while MMQA22VT1G uses SC-74 (SOT-457). Although both are surface-mount packages with 4 unidirectional channels, the pinout and footprint differ. PCB layout modification is required for substitution.
Q: What is the difference between BZA420A,115, BZA420A,125, BZA420A,135, and BZA420A,165?
A: These variants represent different tape reel configurations and manufacturing process codes used by Nexperia for supply chain management. Electrical specifications are identical across all variants. Selection depends on your procurement and manufacturing requirements.
Q: Is ESDA25SC6 a suitable substitute for MMQA22VT1G?
A: ESDA25SC6 provides higher voltage rating (24V standoff) and significantly higher power dissipation (300W vs. 150W). However, the operating temperature range is reduced (-40°C to 125°C vs. -55°C to 150°C), and the SOT-23-6 package requires PCB redesign. Use only if your application does not require the full -55°C lower temperature limit and if PCB layout modification is feasible.
Q: Why are BZA456A parts listed as substitutes if they operate at 5.6V?
A: BZA456A parts are not direct substitutes for 17V applications. They are listed as alternative products within the Nexperia TVS diode portfolio for lower-voltage protection circuits. Confirm your circuit voltage requirements before selecting this series.
Q: What is the impact of lower peak pulse power in BZA420A (19.6W) compared to MMQA22VT1G (150W)?
A: The BZA420A series has significantly reduced peak pulse power rating. This indicates lower energy dissipation capability during transient events. Circuit analysis is required to confirm whether the reduced power rating is acceptable for your specific overvoltage protection requirements.
Q: Are all substitute parts RoHS compliant?
A: Yes. BZA420A and BZA456A series parts are ROHS3 compliant. ESDA25SC6 is also ROHS3 compliant. All parts maintain REACH compliance.
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