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STMicroelectronics SM6T22AY
- Part No.:
- SM6T22AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22AY.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:209
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Product details
Overview
SM6T22AY from STMicroelectronics is an AEC-Q101-qualified unidirectional transient voltage suppression (TVS) diode in SMB package, designed for automotive circuit protection against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and IEC 61000-4-2/ISO 10605 ESD events up to ±30 kV. It features a 22 V nominal breakdown voltage (VBR = 18.8–23.1 V), 30.6 V clamping voltage (VCL) at 20 A (10/1000 µs), 600 W peak pulse power, and 0.2 µA leakage current at 25 °C - enabling robust surge immunity in 12 V automotive power line interfaces.
For engineers reviewing the SM6T22AY datasheet, SM6T22AY pinout, SM6T22AY application, or SM6T22AY equivalent, this device is selected for high-reliability automotive power rail protection where low leakage, high junction temperature operation (Tj up to 150 °C), and compliance with ISO 7637-2 Pulse 1/2a/3a/3b are mandatory design requirements.
Technical Context
The SM6T22AY employs planar silicon technology to achieve stable VBR temperature coefficient (αT = 9.2 × 10−4/°C) and low dynamic resistance (RD = 0.375 Ω), ensuring predictable clamping behavior across −55 °C to +150 °C operating range. Its unidirectional polarity enables asymmetric surge handling on positive-rail applications without reverse conduction path.
It meets stringent automotive reliability standards including J-STD-020 MSL Level 1, JEDEC registered SMB outline, IPC7531 footprint, and ISO 7637-2 compliance for battery-connected systems - with validated performance under Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 18.8 / 20.9 / 23.1 V - ensures reliable turn-on before downstream IC damage during transients |
| VCL @ 20 A (10/1000 µs) | 30.6 V - limits voltage seen by protected load during 600 W surge event |
| IPP (10/1000 µs) | 20 A - supports sustained surge current without thermal runaway at Tj = 150 °C |
| RD | 0.375 Ω - minimizes voltage overshoot during fast-rising transients (e.g., ISO 10605 contact discharge) |
| IR @ VRM = 18 V | 0.2 µA at 25 °C - prevents parasitic loading in high-impedance sensor or CAN bus bias networks |
| Tj max | +150 °C - enables placement near hot engine-control electronics without derating |
| AEC-Q101 qualified | Validated for automotive underhood use per stress test conditions including HTOL, TC, UHAST |
Pinout & Package
The SM6T22AY is housed in an SMB (DO-214AA) surface-mount package with matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026. Dimensions: D = 3.30–3.95 mm, E = 5.10–5.60 mm, E1 = 4.05–4.60 mm, L = 0.75–1.50 mm, b = 1.95–2.20 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink node | Connected to protected line; conducts transient energy to ground when VAK > VBR |
| Anode | Reference/ground return | Typically tied to chassis or system ground; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 certified for under-hood deployment with full HTOL, TC, and UHAST validation |
| High-power surge capability | 600 W (10/1000 µs) and 4 kW (8/20 µs) - handles combined ISO 7637-2 and ESD threats in single device |
| Low-leakage planar junction | 0.2 µA @ 25 °C, 1 µA @ 85 °C - preserves signal integrity in always-on vehicle networks (e.g., LIN, CAN standby) |
| Stable thermal performance | Rated for continuous operation at Tj = 150 °C with no derating - eliminates need for heatsinking in compact ECUs |
| Robust ESD immunity | ±30 kV air/contact discharge (IEC 61000-4-2 & ISO 10605) - exceeds automotive OEM requirements for assembly-line ESD safety |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Interface |
|---|---|
Use Scenario: Protection of 12 V supply rail against load dump and alternator switching transients in gasoline/diesel engine ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and input capacitor to clamp ISO 7637-2 Pulse 1 (−150 V) and Pulse 2a (+112 V). Use Value: Prevents MOSFET gate oxide rupture and MCU brown-out by limiting rail voltage to ≤30.6 V during 20 A surges. |
Use Scenario: ESD protection for LIN transceiver pins exposed to service port connectors in door modules and lighting controllers. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on LIN data line referenced to local ground, absorbing ±30 kV contact discharges. Use Value: Maintains <1 nA leakage at 12 V to avoid LIN bus pull-up current distortion while surviving factory ESD testing. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Surge suppression on 12 V input to image sensor power management IC in front-facing ADAS cameras. IC Role / Device Role / Timing Role: Primary clamping device on camera module's main power rail, rated for ISO 7637-2 Pulse 3a (−220 V) and Pulse 3b (+150 V). Use Value: Ensures uninterrupted imaging during ignition transients by holding VCL ≤30.6 V at 20 A, preventing sensor reset or analog front-end latch-up. |
Use Scenario: Protection of H-bridge driver IC supply against motor back-EMF spikes and battery reversal in EPS control units. IC Role / Device Role / Timing Role: Unidirectional TVS on high-side switch rail, conducting reverse-energy transients to ground during PWM commutation. Use Value: Limits voltage overshoot to 30.6 V with 0.375 Ω RD, reducing stress on gate drivers and extending MOSFET lifetime under cyclic load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Same VBR range (18.8–23.1 V), but lower PPP = 400 W (10/1000 µs); RD = 0.55 Ω | Limited to non-critical 12 V circuits; not AEC-Q101 qualified | Select only for cost-sensitive non-automotive industrial use where ISO 7637-2 Pulse 1/3a compliance is not required |
| SMBJ22A | Identical VBR and PPP = 600 W, but higher IR = 1 µA @ 25 °C; RD = 0.42 Ω | Acceptable for BCM/LIN where leakage <5 µA is tolerable; lacks full ISO 10605 ±30 kV validation | Use when footprint compatibility with SMB package is needed but AEC-Q101 and ±30 kV ESD certification are secondary priorities |
Compared with SMAJ22A and SMBJ22A, the SM6T22AY delivers superior automotive readiness through AEC-Q101 qualification, verified ±30 kV ESD immunity, and lower leakage (0.2 µA) - making it the only choice for safety-critical power rail protection in ECUs, ADAS, and EPS systems requiring full ISO 7637-2 and ISO 10605 compliance.
Availability
SM6T22AY 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 with guaranteed automotive-grade traceability and long-term lifecycle support.
Supply support for SM6T22AY 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 discrete technologies with vertical manufacturing and AEC-Q101 validation infrastructure.
The SM6TY series was developed specifically for automotive power-line transient suppression, targeting ISO 7637-2 Pulse 1/2a/3a/3b and ISO 10605 ESD compliance in under-hood and cabin electronics with high-temperature reliability.
FAQ
What is the maximum clamping voltage of SM6T22AY at 20 A (10/1000 µs)?
The SM6T22AY has a maximum clamping voltage (VCL) of 30.6 V at 20 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature at αT = 9.2 × 10−4/°C, reaching ~32.1 V at Tj = 150 °C per datasheet Equation 2.
Is SM6T22AY suitable for protecting CAN FD physical layer interfaces?
No - SM6T22AY is not recommended for CAN FD data lines due to its 30.6 V clamping voltage and ~100 pF junction capacitance at 1 V reverse bias, which would distort high-speed differential signaling. It is intended exclusively for 12 V power rail protection, not signal-line ESD suppression.
Does SM6T22AY meet ISO 7637-2 Pulse 3a requirements?
Yes - the SM6T22AY is explicitly validated for ISO 7637-2 Pulse 3a (−220 V, 50 Ω source impedance) per DS6905 Rev 11, Figure 15. Its 600 W peak pulse rating and 30.6 V clamping ensure the protected circuit sees less than 35 V during the full 150 ms transient event.
What is the lead finish and soldering profile compliance for SM6T22AY?
The SM6T22AY uses matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026. Its reflow profile follows J-STD-020 MSL Level 1, with peak temperature of 240–245 °C for ≤60 seconds and ramp rates limited to ±3 °C/s, as shown in Figure 25 of DS6905.
SM6T22AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 20A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SM6T22AY FAQ
1.How can I place an order for SM6T22AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22AY 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 SM6T22AY reliable?
The price and inventory of SM6T22AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T22AY is usually 5 days.
3.What payment methods are accepted for SM6T22AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22AY?
SM6T22AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22AY 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 SM6T22AY?
For technical support, including SM6T22AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22AY requirements.
6.How does Aetrix verify that SM6T22AY is sourced from the original manufacturer or authorized distributors?
All SM6T22AY 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 SM6T22AY meets industry standards.
7.What is the process for return or replacement of SM6T22AY?
All SM6T22AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22AY, 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 SM6T22AY part is unused and in its original packaging.
Return procedure for SM6T22AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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