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STMicroelectronics SM6F22AY
- Part No.:
- SM6F22AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F22AY.pdf
- Description:
- TVS DIODE 22VWM 48.3VC SOD128FLT
- Quantity:
- Payment:
- Shipping:
Inventory:8,395
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Product details
Overview
SM6F22AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SOD128 Flat package, designed to clamp transient surges up to 48.3 A (8/20 µs) with 35.5 V clamping voltage at 25 °C and 9.6 × 10⁻⁵ /°C voltage temperature coefficient. It delivers 600 W peak pulse power (10/1000 µs) and operates up to 175 °C junction temperature, protecting CAN/LIN bus lines and power supply rails in 12 V automotive systems.
For engineers reviewing the SM6F22AY datasheet, SM6F22AY pinout, SM6F22AY application, or SM6F22AY equivalent, key selection criteria include its 22 V stand-off voltage, low 0.2 µA leakage at 25 °C, ISO 10605 ±30 kV ESD robustness, and compliance with ISO 7637-2 Pulse 1/2a/3a/3b for automotive load-dump and switching surge immunity.
Technical Context
The SM6F22AY uses planar silicon technology to achieve stable breakdown behavior and low dynamic resistance (0.48 Ω at 10/1000 µs), enabling precise clamping under fast transients while maintaining <1 µA leakage at 85 °C. Its thermal design supports 240 W surge dissipation at Tj = 175 °C, validated per JESD22-A108.
It meets IEC 61000-4-4 Level 4 (±4 kV), exceeds ISO 10605 Level 4 (±30 kV air/contact discharge), and withstands ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) - all critical for 12 V battery-connected ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 22 V - maximum continuous reverse operating voltage before significant leakage; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | 24.4–27.0 V at 1 mA - defines onset of avalanche conduction; ensures reliable turn-on before downstream IC damage. |
| Clamping Voltage (VCL) | 35.5 V at 17.7 A (10/1000 µs) - actual voltage seen by protected circuit during surge; must stay below IC absolute max rating. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - determines survivability against load dump vs. ESD events; higher 8/20 µs rating enables robust ESD protection. |
| Junction Temperature Range | −55 to +175 °C - enables placement near hot engine control units without derating; validated per AEC-Q101 stress tests. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - minimizes standby power loss in always-on vehicle networks like LIN or CAN FD sleep mode. |
| Voltage Tempco (αT) | 9.6 × 10⁻⁵ /°C - allows accurate VCL prediction across temperature; critical for designing margin into 12 V rail protection. |
Pinout & Package
SOD128 Flat package: surface-mount, 2-terminal, lead-free matte tin-plated leads, JEDEC registered outline, IPC7531 footprint compliant, MSL level 1, 260 °C soldering peak temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage event. |
| Anode | Reference node | Typically tied to ground or low-impedance return path; completes clamping loop for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use including temperature cycling, HTRB, and ESD stress per Rev G requirements. |
| Low dynamic resistance (RD) | 0.48 Ω at 10/1000 µs - reduces clamping overshoot and improves energy handling consistency across production lots. |
| High-temperature surge capability | 240 W @ Tj = 175 °C - enables mounting on high-power modules without external heatsinking or derating. |
| ISO 7637-2 Pulse 3b immunity | +150 V transient suppression - protects against alternator-induced spikes during battery disconnection events. |
| ESD robustness | ±30 kV contact/air per ISO 10605 (C = 330 pF, R = 330 Ω) - exceeds automotive infotainment and ADAS sensor interface requirements. |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Transceiver Protection |
|---|---|
Use Scenario: 12 V battery feed to microcontroller power supply in engine bay environment subject to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive transients above 22 V while blocking reverse conduction. Use Value: Limits input voltage to ≤35.5 V during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V), preventing LDO or MCU brownout/failure. |
Use Scenario: Protection of high-speed CAN FD transceiver pins (CANH/CANL) against ESD and coupling noise in body control modules. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp placed between CANH and ground to suppress common-mode surges. Use Value: Maintains signal integrity with <1 nF junction capacitance at 0 V bias, enabling >5 Mbps CAN FD data rates without distortion. |
| LIN Bus Node Protection | Automotive Lighting Driver Input |
Use Scenario: 12 V supply line to LIN slave nodes (e.g., door module sensors) exposed to cable harness ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbs ±30 kV ESD strikes per ISO 10605 without latch-up or parametric shift. Use Value: Ensures >100,000 mating cycles of connector ESD immunity while maintaining <0.2 µA leakage to preserve LIN sleep current budget. |
Use Scenario: Input stage of LED headlamp driver IC subjected to load dump pulses during cold-cranking and battery disconnect. IC Role / Device Role / Timing Role: Primary surge suppressor upstream of buck controller, rated for 4 kW (8/20 µs) to absorb alternator flyback energy. Use Value: Prevents driver IC destruction during ISO 7637-2 Pulse 2a (+112 V), extending field reliability beyond 15-year vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPP (400 W @ 10/1000 µs), higher VCL (38.9 V), no AEC-Q101 qualification | Not qualified for automotive underhood use; suitable only for industrial or consumer-grade 12 V systems | Select when cost sensitivity outweighs automotive qualification and thermal derating is acceptable. |
| TPSMD22A | Same VRM/VCL, but 1000 W PPP (10/1000 µs), AEC-Q101 qualified, larger SMA package (7.11 × 6.22 mm) | Higher surge margin but requires 3× PCB area; less optimal for space-constrained ECU layouts | Select when system-level surge testing exceeds ISO 7637-2 requirements and board space permits larger footprint. |
Compared with SMAJ22A and TPSMD22A, SM6F22AY uniquely balances AEC-Q101 compliance, SOD128 compactness (2.4 × 4.7 mm), and 600 W/4 kW dual-pulse capability-making it optimal for modern automotive ECUs where size, qualification, and multi-standard immunity are jointly constrained.
Availability
SM6F22AY is available at Aetrix Electronics and suitable for automotive ECU power protection, CAN/LIN bus interface hardening, lighting driver surge suppression, and infotainment system ESD shielding requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SM6F22AY 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.
The SM6FxxAY series belongs to ST's automotive-grade transient voltage suppression portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V vehicle architectures with high-reliability thermal and surge performance.
FAQ
What is the maximum clamping voltage of SM6F22AY under a 10/1000 µs surge?
The maximum clamping voltage is 35.5 V at 17.7 A for a 10/1000 µs waveform at 25 °C. This value increases with junction temperature at a rate defined by αT = 9.6 × 10⁻⁵ /°C, reaching approximately 38.2 V at 125 °C using the formula VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Is SM6F22AY suitable for bidirectional signal line protection?
No - SM6F22AY is a unidirectional TVS diode intended for DC power rail or single-polarity signal protection. For bidirectional applications such as USB or RS-485, ST offers the SMBJ22CA or SMCJ22CA series, which provide symmetrical clamping for both polarities.
How does SM6F22AY perform under ISO 7637-2 Pulse 3a (−220 V)?
SM6F22AY clamps Pulse 3a transients to ≤35.5 V when mounted on the recommended IPC7531 footprint with ≥1 cm² copper pour per lead. Its 240 W surge rating at 175 °C ensures survival of this −220 V spike without parametric shift or failure, as verified in ST's AN2689 application note.
What is the marking code for SM6F22AY on the device body?
The top-side marking is "5BOY", as specified in Table 6 of DS13062 Rev 3. This 4-character code identifies the stand-off voltage (22 V), unidirectional polarity ('A'), and automotive grade ('Y') per ST's standardized ordering scheme.
SM6F22AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SOD-128
- Series:
- SM6F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V (Max)
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 48.3V
- Current - Peak Pulse (10/1000µs):
- 83A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD128Flat
SM6F22AY FAQ
1.How can I place an order for SM6F22AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F22AY 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 SM6F22AY reliable?
The price and inventory of SM6F22AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F22AY is usually 5 days.
3.What payment methods are accepted for SM6F22AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F22AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F22AY?
SM6F22AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F22AY 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 SM6F22AY?
For technical support, including SM6F22AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F22AY requirements.
6.How does Aetrix verify that SM6F22AY is sourced from the original manufacturer or authorized distributors?
All SM6F22AY 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 SM6F22AY meets industry standards.
7.What is the process for return or replacement of SM6F22AY?
All SM6F22AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F22AY, 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 SM6F22AY part is unused and in its original packaging.
Return procedure for SM6F22AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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