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STMicroelectronics SMA6T22CAY
- Part No.:
- SMA6T22CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6T22CAY.pdf
- Description:
- TVS DIODE 18.8VWM 39.3VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
SMA6T22CAY from STMicroelectronics is a bidirectional 600 W automotive-grade transient voltage suppression (TVS) diode in SMA package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity. It features a 22 V breakdown voltage (VBR = 20.9–23.1 V), 30.6 V clamping voltage (VCL) at 20 A (10/1000 µs), and 0.2 µA leakage current at 25 °C - enabling robust surge protection in 12 V/24 V automotive power networks.
For engineers reviewing the SMA6T22CAY datasheet, SMA6T22CAY pinout, SMA6T22CAY application, or SMA6T22CAY equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low dynamic resistance (0.375 Ω), and compliance with ISO 7637-2 Pulse 1/2a/3a/3b and IEC 61000-4-4 Level 4.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (<1 µA at 85 °C) and stable VBR over temperature (αT = 9.2 × 10−4/°C). Its bidirectional architecture enables symmetric clamping for both positive and negative transients without polarity dependence.
The device meets stringent automotive surge requirements: it withstands −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), and +150 V (Pulse 3b) per ISO 7637-2, while delivering 30 kV ESD immunity (air/contact discharge, C = 150 pF / 330 Ω and C = 330 pF / 330 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 20.9–23.1 V at IBR = 1 mA - ensures reliable triggering before downstream circuit damage in 24 V systems |
| Clamping Voltage (VCL) | 30.6 V at IPP = 20 A (10/1000 µs) - limits transient voltage seen by protected ICs to safe levels |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - supports high-energy surge absorption without thermal runaway |
| Leakage Current (IR) | 0.2 µA max at VRM = 18.8 V and Tj = 25 °C - minimizes standby power loss in always-on vehicle modules |
| Junction Temperature Range | −55 to +150 °C - enables operation in under-hood environments including engine control units and body controllers |
| ESD Withstand | ±30 kV (air & contact discharge, IEC 61000-4-2, C = 150 pF/R = 330 Ω) - exceeds automotive OEM ESD immunity requirements |
| Dynamic Resistance (RD) | 0.375 Ω - reduces voltage overshoot during fast-rising transients (e.g., load dump, inductive switching) |
Pinout & Package
Package: SMA (DO-214AC), JEDEC registered outline, matte tin-plated leads, MSL Level 1, footprint per IPC7531.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode side marked band) | Transient current sink (bidirectional) | Both terminals conduct equally during ± surges - no polarity sensitivity required in PCB layout |
| Cathode (marked with band) | Transient current sink (bidirectional) | Band indicates cathode end but does not imply unidirectional function - device operates symmetrically |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, vibration, and lifetime stress tests per JESD22 standards |
| Bidirectional clamping | Enables single-device protection of differential lines or floating rails without polarity constraints |
| Low dynamic resistance (0.375 Ω) | Minimizes clamping voltage rise under high di/dt events such as ISO 7637-2 Pulse 3b (200 ns rise time) |
| 150 °C maximum junction temperature | Supports placement near heat-generating components (e.g., power MOSFETs, DC-DC converters) in compact ECUs |
| UL94 V0 flammability rating | Ensures PCB-level fire safety compliance in enclosed automotive enclosures and junction boxes |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus |
|---|---|
Use Scenario: Protection of 12 V supply rail against load dump (ISO 7637-2 Pulse 5a) and alternator-induced spikes. IC Role / Device Role / Timing Role: Primary transient suppressor placed upstream of DC-DC converter input stage. Use Value: Clamps 150 V transients to ≤30.6 V within 100 ns, preventing overvoltage shutdown of PMICs and microcontrollers. |
Use Scenario: ESD and burst protection on LIN physical layer (TP12/TP13) in door modules and seat controllers. IC Role / Device Role / Timing Role: Bidirectional line protector between LIN transceiver and external harness connector. Use Value: Absorbs ±30 kV contact discharge without latch-up, preserving bus communication integrity during assembly and service. |
| Advanced Driver Assistance System (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Surge protection on 5 V or 3.3 V camera module power rail exposed to EMI from nearby radar or infotainment systems. IC Role / Device Role / Timing Role: Secondary clamp after primary DC-DC filter, targeting fast ESD and coupled noise. Use Value: 0.2 µA leakage avoids measurable dropout in low-current image sensor bias supplies. |
Use Scenario: Protection of H-bridge gate driver supply against inductive kickback from motor phase switching. IC Role / Device Role / Timing Role: Fast-response TVS parallel to driver IC VDD pin, rated for repetitive 8/20 µs surges. Use Value: 4 kW peak power rating handles multiple consecutive PWM-edge transients without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6T24CAY | Higher VBR (22.8–25.2 V), higher VCL (33.2 V @ 18 A), lower IPP (18 A) | Better suited for 24 V nominal systems where margin above battery float voltage is critical | Select when protecting circuits with >21 V operating range and requiring tighter VBR tolerance |
| SMA6T18CAY | Lower VBR (17.1–18.9 V), lower VCL (25.2 V @ 24 A), higher IPP (24 A) | Optimized for 12 V systems with strict clamping voltage limits (e.g., MCU I/O rails) | Choose for legacy 12 V architectures needing faster response and lower let-through voltage |
Compared with SMA6T24CAY and SMA6T18CAY, SMA6T22CAY provides optimal balance for dual-voltage (12/24 V) automotive platforms: its 22 V VBR avoids false triggering during cold-crank (6.5 V) yet clamps decisively before 30 V logic damage thresholds.
Availability
SMA6T22CAY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for SMA6T22CAY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad IP portfolio.
SMA6T22CAY belongs to the SMA6TY Transil series - engineered specifically for AEC-Q101-compliant transient suppression in automotive power networks subject to ISO 7637-2 and ISO 10605 stress profiles.
FAQ
Is SMA6T22CAY unidirectional or bidirectional?
SMA6T22CAY is a bidirectional TVS diode, as indicated by the "C" in its order code (SMA6T22CAY). It provides symmetrical clamping for both positive and negative transients, making it suitable for AC-coupled lines, floating grounds, and differential buses without polarity concerns.
What is the maximum clamping voltage at 10 A (10/1000 µs)?
Per Table 2 in DS6931 Rev 9, the maximum clamping voltage (VCL) for SMA6T22CAY at 10 A (10/1000 µs) is 27.2 V. This value is derived from VBRmax + RD × IPP = 23.1 V + 0.375 Ω × 10 A = 27.2 V, ensuring predictable overvoltage limiting in design validation.
Does SMA6T22CAY meet ISO 7637-2 Pulse 3b requirements?
Yes - SMA6T22CAY is explicitly characterized for ISO 7637-2 Pulse 3b (+150 V, 200 ns rise time) in Figures 16 and 13–16 of DS6931. Its 4 kW (8/20 µs) peak power rating and 0.375 Ω dynamic resistance ensure effective suppression of this fast, high-amplitude transient common in motor driver switching noise.
Can SMA6T22CAY replace SMA6T22AY in a design?
No - SMA6T22AY is unidirectional (clamps only negative transients), while SMA6T22CAY is bidirectional. Substitution requires verifying circuit polarity, grounding scheme, and transient directionality. Layout changes may be needed to avoid reverse-bias failure of the unidirectional part if used in bidirectional applications.
SMA6T22CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 39.3V
- Current - Peak Pulse (10/1000µs):
- 102A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6T22CAY FAQ
1.How can I place an order for SMA6T22CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6T22CAY 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 SMA6T22CAY reliable?
The price and inventory of SMA6T22CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6T22CAY is usually 5 days.
3.What payment methods are accepted for SMA6T22CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6T22CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6T22CAY?
SMA6T22CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6T22CAY 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 SMA6T22CAY?
For technical support, including SMA6T22CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6T22CAY requirements.
6.How does Aetrix verify that SMA6T22CAY is sourced from the original manufacturer or authorized distributors?
All SMA6T22CAY 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 SMA6T22CAY meets industry standards.
7.What is the process for return or replacement of SMA6T22CAY?
All SMA6T22CAY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6T22CAY, 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 SMA6T22CAY part is unused and in its original packaging.
Return procedure for SMA6T22CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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