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SZ1SMA22CAT3G
Littelfuse Inc.
ZEN TVS 400W 22V BI DO-214AC
78909 Pcs New Original In Stock
35.5V Clamp 11.3A Ipp Tvs Diode Surface Mount SMA
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5.0 / 5.0
- (182 Ratings)
SZ1SMA22CAT3G
Product Overview
10298924
DiGi Electronics Part Number
SZ1SMA22CAT3G-DGManufacturer
Littelfuse Inc.
SZ1SMA22CAT3G
Description
ZEN TVS 400W 22V BI DO-214ACInventory
78909 Pcs New Original In Stock
35.5V Clamp 11.3A Ipp Tvs Diode Surface Mount SMA
Quantity
Minimum 1
Minimum 1
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SZ1SMA22CAT3G Technical Specifications
Category
Transient Voltage Suppressors (TVS), TVS Diodes
Packaging
Tape & Reel (TR)
Series
SZ1SMA
Product Status
Active
Type
Zener
Bidirectional Channels
1
Voltage - Reverse Standoff (Typ)
22V
Voltage - Breakdown (Min)
24.4V
Voltage - Clamping (Max) @ Ipp
35.5V
Current - Peak Pulse (10/1000µs)
11.3A
Power - Peak Pulse
400W
Power Line Protection
No
Applications
-
Capacitance @ Frequency
-
Operating Temperature
-65°C ~ 150°C (TJ)
Grade
Automotive
Qualification
AEC-Q101
Mounting Type
Surface Mount
Package / Case
DO-214AC, SMA
Supplier Device Package
SMA
Base Product Number
1SMA
Datasheet & Documents
HTML Datasheet
SZ1SMA22CAT3G-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
REACH Status
REACH Affected
ECCN
EAR99
HTSUS
8541.10.0080
Additional Information
Other Names
18-SZ1SMA22CAT3GCT
-1024-SZ1SMA22CAT3GCT
-1024-SZ1SMA22CAT3GCT-DG
18-SZ1SMA22CAT3GDKR
18-SZ1SMA22CAT3GTR
Standard Package
5,000
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Livraison très rapide, et le colis était parfaitement protégé contre tout dommage.
Dec 02, 2025
Die Produktqualität ist bei DiGi Electronics stets auf hohem Niveau.
Dec 02, 2025
Their focus on quality and customer satisfaction is truly impressive.
Dec 02, 2025
The use of reinforced packaging materials demonstrates their dedication to quality.
Dec 02, 2025
The speed of delivery at DiGi Electronics is consistently excellent.
Dec 02, 2025
The shipping times are unbeatable, and their staff is always helpful.
Dec 02, 2025
I appreciated the friendly support and the quick delivery of my order.
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Frequently Asked Questions (FAQ)
What are the key design risks when integrating the Littelfuse SZ1SMA22CAT3G TVS diode for automotive transient protection and how can they be mitigated?
A primary risk with the SZ1SMA22CAT3G is ensuring proper thermal management during high surge events, as its 400W peak pulse power rating requires effective heatsinking. Designers should ensure adequate copper pour on the PCB near the SMA package to dissipate heat and consider PCB layout to minimize impedance. Another risk is selecting an appropriate standoff voltage (22V) that balances protection level with normal operating voltage, avoiding nuisance tripping. Over-specifying the standoff voltage could leave the circuit vulnerable to lower amplitude transients, while under-specifying might lead to the SZ1SMA22CAT3G conducting during normal operation, impacting performance and longevity.
Under what specific overvoltage conditions would the Littelfuse SZ1SMA22CAT3G be a suitable replacement for a competitor's 22V TVS diode, and what are the potential integration challenges?
The SZ1SMA22CAT3G is a strong candidate for replacing competitor 22V TVS diodes, particularly when the application demands a higher peak pulse current handling capability (11.3A) than comparable parts might offer. For instance, if a design previously used a Littelfuse 1SMA22CAT3 or a similar 22V SMA TVS experiencing repeated failures under high current transients, the SZ1SMA22CAT3G offers increased robustness. Integration challenges could arise if the competitor part had slightly different clamping characteristics (e.g., a lower or higher max clamp voltage at a specific Ipp) which might affect the protected downstream circuitry's performance or vulnerability. Careful re-evaluation of the clamping voltage (35.5V max @ 11.3A) against the downstream component's maximum voltage rating is crucial.
How does the bidirectional nature of the Littelfuse SZ1SMA22CAT3G TVS diode impact its suitability for protecting AC-coupled circuits versus DC-only circuits in automotive systems?
The bidirectional capability of the SZ1SMA22CAT3G makes it inherently suitable for protecting AC-coupled circuits because it can suppress transient voltages in both polarities without requiring external series diodes. This simplifies circuit design and reduces component count compared to using two unidirectional TVS diodes. For DC-only circuits, while it functions correctly, a unidirectional TVS might offer a slightly lower leakage current or faster response time in some specific scenarios, though the SZ1SMA22CAT3G's performance is generally excellent for both. The key consideration is ensuring the 22V reverse standoff voltage is appropriate for the DC operating voltage to prevent premature conduction.
What are the critical design trade-offs when considering the Littelfuse SZ1SMA22CAT3G for a high-temperature automotive environment, specifically concerning its operating temperature range and qualification?
The SZ1SMA22CAT3G's operating temperature range of -65°C to 150°C is a significant advantage for automotive applications. However, a critical design trade-off emerges when operating near the upper limit. While the device is qualified to AEC-Q101, sustained operation at 150°C, especially under high surge conditions that generate heat, can accelerate aging and potentially degrade its long-term reliability. Designers must ensure that the ambient temperature plus any self-heating from continuous operation or frequent transients does not persistently push the junction temperature towards the maximum. Proper thermal design, as mentioned earlier, is paramount to achieving the expected lifespan of the SZ1SMA22CAT3G in demanding automotive thermal cycles.
If a design requires protection against ESD events in addition to lower energy transients, how does the Littelfuse SZ1SMA22CAT3G TVS diode perform, and what are the potential design limitations compared to dedicated ESD protection devices?
The SZ1SMA22CAT3G, with its 400W peak pulse power rating and 11.3A peak pulse current handling, can effectively suppress many ESD events, particularly those exceeding typical IEC 61000-4-2 levels. Its 35.5V maximum clamping voltage at peak pulse current indicates good suppression capability. However, a potential design limitation compared to dedicated ESD protection devices (like lower voltage, higher speed ESD diodes or varistors optimized for IEC 61000-4-2 compliance) is its capacitance. While not explicitly listed, SMA TVS diodes typically have higher capacitance than specialized ESD diodes. If extremely low capacitance is critical for high-speed signal integrity, the SZ1SMA22CAT3G might introduce undesirable signal degradation. Always verify its capacitance characteristics against the specific application's bandwidth requirements when considering it for mixed transient and ESD protection.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
SZ1SMA22CAT3G CAD Models
Littelfuse Inc. SZ1SMA22CAT3G PCB symbols & footprints
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