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STMicroelectronics SM6F20AY
- Part No.:
- SM6F20AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F20AY.pdf
- Description:
- TVS DIODE 20VWM 42.8VC SOD128FLT
- Quantity:
- Payment:
- Shipping:
Inventory:5,990
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Product details
Overview
SM6F20AY from STMicroelectronics is an AEC-Q101 qualified unidirectional 600 W transient voltage suppressor (TVS) diode in SOD128 Flat package, designed for automotive circuit protection against ISO 7637-2 pulses and IEC/ISO ESD events. It features a 20 V stand-off voltage (VRM), 32.4 V clamping voltage at 19.4 A (10/1000 µs), 0.2 µA leakage at 25 °C, and operates up to 175 °C junction temperature.
For engineers reviewing the SM6F20AY datasheet, SM6F20AY pinout, SM6F20AY application, or SM6F20AY equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low-leakage behavior at elevated temperatures, compliance with ISO 10605 ±30 kV (air/contact), and suitability for 12 V automotive power line protection per ISO 7637-2 Pulse 1, 2a, 3a, and 3b.
Technical Context
The SM6F20AY uses planar silicon technology to achieve stable breakdown at 22.2–24.6 V (IBR = 1 mA) and low dynamic resistance (0.402 Ω at 10/1000 µs), enabling precise clamping during fast transients. Its unidirectional configuration supports reverse-biased protection of positive-rail circuits without forward conduction interference.
Rated for 175 °C operation, it maintains 240 W peak pulse power at Tj = 175 °C (10/1000 µs), exceeding standard 600 W rating at 25 °C. It meets IEC 61000-4-4 Level 4 (±4 kV), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1 (−150 V), 2a (+112 V), 3a (−220 V), 3b (+150 V) requirements for 12 V battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 20 V - Maximum continuous reverse operating voltage before significant leakage; defines minimum system rail margin for reliable protection. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - Confirmed voltage threshold where avalanche conduction begins; ensures predictable turn-on during overvoltage events. |
| Clamping Voltage (VCL) | 32.4 V at 19.4 A (10/1000 µs) - Peak voltage seen by protected circuit during surge; directly limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs, 25 °C) - Energy-handling capability for long-duration load dump transients; derates to 240 W at 175 °C. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ultra-low reverse current preserves battery life and avoids false triggering in always-on automotive modules. |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in engine bay, transmission control, or ADAS sensors exposed to extreme thermal environments. |
| ESD Rating | ±30 kV (IEC 61000-4-2, C = 150 pF/R = 330 Ω; ISO 10605, C = 330 pF/R = 330 Ω) - Full immunity to human-body-model and machine-model ESD events in assembly and field use. |
Pinout & Package
SOD128 Flat package: surface-mount, two-terminal, unidirectional TVS diode with matte tin-plated leads (MSL level 1, JEDEC registered outline, IPC7531 footprint). Dimensions: 4.7 mm × 2.4 mm × 1.0 mm (L × W × H); weight: 28 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked end) | Surge current sink | Connected to protected line (e.g., 12 V rail); conducts avalanche current to ground during overvoltage. |
| Anode | Reference node | Connected to system ground; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Low dynamic resistance (RD) | 0.402 Ω at 10/1000 µs - Minimizes clamping voltage rise under high-current surges, improving protection margin for sensitive MCUs. |
| High-temperature power derating | 240 W peak pulse power at Tj = 175 °C - Maintains robust surge handling in under-hood applications without thermal shutdown. |
| UL94 V0 & RoHS-compliant | Flame-retardant epoxy housing and lead-free matte tin plating - Meets automotive safety and environmental compliance mandates. |
| ISO 7637-2 Pulse compatibility | Validated for Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) - Directly addresses real-world automotive load dump and inductive switching threats. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
Use Scenario: Protecting 12 V supply input of gasoline/diesel engine ECUs against alternator load dump and battery disconnection transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before DC-DC converter stage. Use Value: Clamps to 32.4 V at 19.4 A, preventing overvoltage damage to 36 V-rated input stages while maintaining <0.2 µA leakage to avoid parasitic drain. |
Use Scenario: Safeguarding LIN bus physical layer transceivers from ESD and coupled noise in door modules and seat controllers. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (anode grounded) shunting ESD energy from LIN signal line to chassis ground. Use Value: Withstands ±30 kV contact discharge per ISO 10605 and clamps LIN line to <35 V during 8/20 µs surges, preserving signal integrity below transceiver's absolute max rating. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Securing 12 V power feed to front-facing camera modules mounted behind windshield, exposed to thermal cycling and ESD during service. IC Role / Device Role / Timing Role: Primary overvoltage protector upstream of buck converter supplying image sensor and ISP. Use Value: Operates reliably at 175 °C ambient, ensuring protection remains effective even when camera housing reaches >105 °C in summer parking conditions. |
Use Scenario: Suppressing inductive kickback from H-bridge motor drivers during EPS torque assist and return-to-center maneuvers. IC Role / Device Role / Timing Role: TVS connected across motor supply rail to absorb energy from back-EMF during PWM switching transitions. Use Value: Delivers 600 W (10/1000 µs) surge capacity and 0.402 Ω RD to limit voltage overshoot below 40 V, protecting gate drivers and current sense amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | DO-214AC package; 20 V VRM; 32.4 V VCL @ 19.4 A; 400 W PPP (10/1000 µs); not AEC-Q101 qualified. | Lacks automotive qualification and high-temperature derating (max Tj = 150 °C); suitable for industrial/commercial 12 V rails only. | Select SMAJ20A only if AEC-Q101 and 175 °C operation are not required; verify PCB layout accommodates larger DO-214AC footprint. |
| TPSMD20A | SMD package; 20 V VRM; 32.4 V VCL @ 19.4 A; 600 W PPP; AEC-Q101 qualified; Tj max = 175 °C; but higher IRM (1 µA at 25 °C). | Higher leakage may impact ultra-low-power always-on nodes (e.g., remote keyless entry receivers); identical clamping and surge specs. | Prefer SM6F20AY over TPSMD20A when sub-1 µA leakage at 25 °C is critical for battery-sensitive modules like telematics or alarm systems. |
Compared with SMAJ20A and TPSMD20A, SM6F20AY uniquely combines AEC-Q101 qualification, 175 °C operation, and 0.2 µA leakage at 25 °C in the compact SOD128 Flat package-making it optimal for space-constrained, thermally aggressive automotive power rail protection where long-term reliability and low standby loss are mandatory.
Availability
SM6F20AY 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 SM6F20AY 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The SM6FY series belongs to ST's automotive-grade transient protection portfolio, engineered specifically to meet stringent ISO 7637-2 and ISO 10605 requirements for 12 V and 24 V vehicle electrical systems.
FAQ
What is the maximum clamping voltage of SM6F20AY under a 10/1000 µs surge?
The SM6F20AY clamps to 32.4 V at 19.4 A under a 10/1000 µs waveform at 25 °C. This value increases with junction temperature due to its positive voltage temperature coefficient (αT = 9.4 × 10⁻⁴ /°C), reaching approximately 34.1 V at 175 °C using the formula VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Is SM6F20AY suitable for protecting CAN bus lines?
No. SM6F20AY is a unidirectional TVS rated for 20 V stand-off and optimized for power rail protection-not data line protection. CAN bus requires bidirectional devices with lower capacitance (<100 pF) and tighter clamping (e.g., 12 V VBR) to avoid signal distortion; SM6F20AY's 1.5 nF junction capacitance at 0 V would severely degrade CAN signal integrity.
Does SM6F20AY require a heatsink for 600 W surge handling?
No external heatsink is needed. The SOD128 Flat package achieves Rth(j-a) ≈ 120 °C/W on a 1 cm² copper pad per lead (per Figure 11), and its 600 W rating applies to single-pulse conditions with short thermal time constants. Continuous power dissipation is limited to ~0.5 W; sustained surges must be spaced to allow junction cooling.
How does SM6F20AY differ from SM6F20A (non-AY suffix)?
The "AY" suffix denotes the SOD128 Flat package with matte tin plating and AEC-Q101 qualification. SM6F20A (without Y) refers to obsolete variants in DO-214AA or non-automotive packages lacking AEC-Q101 validation, higher leakage, and no 175 °C rating. Only SM6F20AY meets current automotive design-in requirements.
SM6F20AY 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):
- 20V (Max)
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 42.8V
- Current - Peak Pulse (10/1000µs):
- 93A (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
SM6F20AY FAQ
1.How can I place an order for SM6F20AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F20AY 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 SM6F20AY reliable?
The price and inventory of SM6F20AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F20AY is usually 5 days.
3.What payment methods are accepted for SM6F20AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F20AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F20AY?
SM6F20AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F20AY 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 SM6F20AY?
For technical support, including SM6F20AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F20AY requirements.
6.How does Aetrix verify that SM6F20AY is sourced from the original manufacturer or authorized distributors?
All SM6F20AY 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 SM6F20AY meets industry standards.
7.What is the process for return or replacement of SM6F20AY?
All SM6F20AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F20AY, 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 SM6F20AY part is unused and in its original packaging.
Return procedure for SM6F20AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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