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onsemi 1SMA22CAT3G
- Part No.:
- 1SMA22CAT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA22CAT3G.pdf
- Description:
- TVS DIODE 22VWM 38.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,143
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Product details
Overview
1SMA22CAT3G from ON Semiconductor is a bidirectional 400 W peak power Zener transient voltage suppressor (TVS) in SMA package, with 22 V working peak reverse voltage (VRWM), 24.4 V nominal breakdown voltage (VBR), 38.9 V clamping voltage (VC) at 10.3 A peak pulse current (IPP), and <1 ns response time. It protects sensitive circuitry in power supplies and industrial control systems against ESD and lightning-induced surges.
For engineers reviewing the 1SMA22CAT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to IC absolute maximum ratings, IPP capability under IEC 61000-4-5 waveform, and junction capacitance (225 pF @ 0 V) for high-speed signal line compatibility.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling protection of AC lines or differential buses without polarity constraints. Its low zener impedance and fast sub-nanosecond response ensure effective clamping before downstream components experience overvoltage stress.
The device uses a planar Zener junction structure in a void-free transfer-molded plastic SURMETIC® package (Case 403D), rated for 260°C soldering (10 s), and meets AEC-Q101 for automotive applications when ordered as SZ-prefix variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VBR (min/typ/max) | 24.4 V / 25.7 V / 27.0 V - Zener breakdown threshold at 1 mA test current; defines onset of avalanche conduction. |
| VC @ IPP | 38.9 V at 10.3 A - Clamped voltage during 10/1000 µs surge; determines maximum stress seen by protected IC. |
| PPK | 400 W @ 1 ms - Peak surge power handling per non-repetitive 10×1000 µs waveform (R.E.A. standard). |
| CJ @ 0 V | 225 pF - Junction capacitance at zero bias; impacts signal integrity on data lines above ~1 MHz. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed robustness against human-body-model electrostatic discharge events. |
| Package | SMA (Case 403D) - Surface-mount plastic package with 2.6 mm × 4.3 mm footprint and 1.14 mm height; compatible with standard reflow profiles. |
Pinout & Package
SMA package (Case 403D) is a bidirectional surface-mount device with two terminals: Cathode and Anode. Polarity is indicated by a cathode band on one end; the device functions identically in either orientation due to symmetrical Zener structure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band End | Cathode (K) | Marked terminal; connects to higher-potential side during positive transients; forms Zener junction anode during negative transients. |
| Opposite End | Anode (A) | Unmarked terminal; connects to lower-potential side during positive transients; forms Zener junction cathode during negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, RS-485 buses, or ungrounded sensor interfaces without polarity concerns. |
| 400 W peak power rating | Withstands IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge events on 24 V industrial power rails. |
| <1 ns response time | Clamps transients before propagation into microcontroller I/O or analog front-end stages. |
| 260°C soldering tolerance | Supports lead-free reflow without delamination or parameter shift; validated per JEDEC J-STD-020. |
| AEC-Q101 qualified (SZ variant) | Meets automotive-grade reliability requirements including temperature cycling, humidity bias, and mechanical shock. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter IC and input filter capacitor. Use Value: Limits transient voltage to ≤38.9 V, preventing damage to 40 V-rated MOSFETs and ensuring uninterrupted operation during 12 V/24 V vehicle battery disturbances. |
Use Scenario: CAN FD transceiver power rail (VCC) in door module subjected to ESD and coupled noise from window motor switching. IC Role / Device Role / Timing Role: Secondary protection device parallel to bulk capacitor, supplementing internal transceiver ESD diodes. Use Value: Absorbs >16 kV HBM ESD strikes and clamps 10/1000 µs surges to safe levels below transceiver's 36 V absolute maximum rating. |
| Medical Equipment Input Filtering | Industrial Ethernet PHY Interface |
|
Use Scenario: Mains-derived 12 V auxiliary supply in patient monitor exposed to EN 61000-4-4 EFT bursts. IC Role / Device Role / Timing Role: Final-stage transient suppressor after common-mode choke and X/Y capacitors. Use Value: Provides <1 ns response to fast-rising EFT edges, maintaining <500 mV ripple on LDO input and preserving ADC reference stability. |
Use Scenario: Bias rail protection for 100BASE-TX Ethernet PHY IC in factory automation switch with PoE injector. IC Role / Device Role / Timing Role: Standoff device between PoE PD interface and PHY VDDIO rail, coordinated with primary DC-DC OVP. Use Value: 225 pF capacitance avoids signal degradation on 100 MHz MDI traces while clamping induced surges from nearby relay switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA22CAT3G | Identical electrical specs; AEC-Q101 qualified, PPAP-capable, with SZ prefix indicating automotive-specific traceability and change control. | Required for automotive OEM BOMs where qualification documentation and lot traceability are mandatory. | Select when automotive production compliance (not just environmental ruggedness) is contractually required. |
| 1.5SMC22CA | Same VRWM/VBR/VC/IPP, but in larger SMC (DO-214AB) package (7.1 mm × 6.2 mm); 1500 W peak power rating. | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint. | Choose only if 1500 W surge margin is needed and board layout accommodates 2.5× larger package area. |
Compared with 1SMA22CAT3G, SZ1SMA22CAT3G adds automotive qualification overhead without electrical benefit, while 1.5SMC22CA trades compactness for higher surge capacity-making 1SMA22CAT3G optimal for space-constrained industrial PCBs requiring certified 400 W protection.
Availability
1SMA22CAT3G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical auxiliary power rails, and industrial Ethernet PHY protection requiring stable component supply and full traceability.
Supply support for 1SMA22CAT3G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMAxxCAT3G series belongs to onsemi's SURMETIC® TVS portfolio, engineered specifically for cost-sensitive, high-volume industrial and automotive surge protection where reliability, compact size, and standardized reflow compatibility are critical.
FAQ
What is the clamping voltage of the 1SMA22CAT3G under a standard 10/1000 µs surge?
The 1SMA22CAT3G has a maximum clamping voltage (VC) of 38.9 V at 10.3 A peak pulse current (IPP), measured using the 10/1000 µs double-exponential waveform defined by R.E.A. This value ensures protected circuits remain below typical 40 V absolute maximum ratings of downstream power management ICs when subjected to IEC 61000-4-5 Level 3 surges.
Is the 1SMA22CAT3G suitable for protecting RS-485 communication lines?
Yes, the 1SMA22CAT3G is appropriate for RS-485 bus protection due to its bidirectional symmetry and 225 pF junction capacitance at 0 V bias. When placed across A/B lines with appropriate series current-limiting resistors, it clamps ESD and surge events without distorting the 10 Mbps signal integrity-verified in onsemi's AN-1044 application note for data line TVS selection.
Does the 1SMA22CAT3G have automotive qualification?
The base 1SMA22CAT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZ1SMA22CAT3G shares identical electrical parameters and adds AEC-Q101 certification, PPAP capability, and enhanced traceability. For non-automotive industrial use, 1SMA22CAT3G meets all functional requirements without qualification overhead.
What is the thermal resistance from junction-to-ambient for the 1SMA22CAT3G?
The 1SMA22CAT3G has a junction-to-ambient thermal resistance (RJA) of 250 °C/W when mounted on an FR-4 board using onsemi's minimum recommended footprint (per Case 403D outline). This value assumes no thermal vias or copper pour; adding two 1 mm² thermal vias reduces RJA to ~120 °C/W, enabling sustained 0.5 W dissipation at 75°C ambient.
How does the 1SMA22CAT3G compare to unidirectional TVS diodes like 1SMA22AT3G?
The 1SMA22CAT3G is bidirectional and protects both positive and negative transients symmetrically, whereas 1SMA22AT3G is unidirectional and only clamps positive surges (with cathode grounded). Use 1SMA22CAT3G for AC-coupled or floating signal lines (e.g., Ethernet, audio), and 1SMA22AT3G only for DC rails with known polarity and ground reference.
1SMA22CAT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 260pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA22CAT3G FAQ
1.How can I place an order for 1SMA22CAT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA22CAT3G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1SMA22CAT3G reliable?
The price and inventory of 1SMA22CAT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA22CAT3G is usually 5 days.
3.What payment methods are accepted for 1SMA22CAT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA22CAT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA22CAT3G?
1SMA22CAT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA22CAT3G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1SMA22CAT3G?
For technical support, including 1SMA22CAT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA22CAT3G requirements.
6.How does Aetrix verify that 1SMA22CAT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA22CAT3G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1SMA22CAT3G meets industry standards.
7.What is the process for return or replacement of 1SMA22CAT3G?
All 1SMA22CAT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA22CAT3G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1SMA22CAT3G part is unused and in its original packaging.
Return procedure for 1SMA22CAT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA22CAT3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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