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STMicroelectronics SM6F15AY
- Part No.:
- SM6F15AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F15AY.pdf
- Description:
- TVS DIODE 15VWM 32.5VC SOD128FLT
- Quantity:
- Payment:
- Shipping:
Inventory:5,980
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Product details
Overview
SM6F15AY from STMicroelectronics is a unidirectional 600 W automotive-grade TVS diode in SOD128 Flat package, with 15 V stand-off voltage (VRM), 16.7–18.5 V breakdown (VBR), and 24.4 V clamping voltage (VCL) at 25.1 A (10/1000 µs). It delivers 32.5 A surge handling (8/20 µs) and operates up to 175 °C junction temperature, designed for ISO 7637-2 pulse protection in 12 V automotive power lines.
For engineers reviewing the SM6F15AY datasheet, SM6F15AY pinout, SM6F15AY application, or SM6F15AY equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, leakage current at elevated temperature, peak pulse power derating above 25 °C, and compliance with ISO 10605 ±30 kV ESD and ISO 7637-2 Pulse 1/2a/3a/3b waveforms.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (0.2 µA at 25 °C, 1 µA at 85 °C) and stable dynamic resistance (0.235 Ω at 25 °C, 10/1000 µs), enabling reliable long-term operation in high-temperature engine bay environments. Its unidirectional configuration provides reverse-biased surge suppression only, with forward conduction blocked by system polarity design.
The device meets AEC-Q101 qualification and supports full automotive transient immunity: ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), while maintaining <9.9 °C/W thermal resistance on recommended FR4 footprint with 1 cm² copper per lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 15 V - Maximum continuous reverse operating voltage before significant leakage; sets minimum system bus voltage margin. |
| Breakdown Voltage (VBR) | 16.7–18.5 V - Voltage at 1 mA IBR; defines onset of avalanche conduction during transients. |
| Clamping Voltage (VCL) | 24.4 V at 25.1 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; must be below IC absolute max rating. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy absorption capability at 25 °C; derates to 240 W at 175 °C Tj. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ensures minimal standby power loss and signal integrity in always-on automotive modules. |
| Operating Junction Temp | −55 to +175 °C - Enables placement near heat sources (e.g., ECUs, body controllers) without derating. |
| ESD Withstand | ±30 kV (IEC 61000-4-2, 150 pF/330 Ω); ±30 kV (ISO 10605, 330 pF/330 Ω) - Exceeds Level 4 for both air and contact discharge. |
Pinout & Package
SOD128 Flat package: surface-mount, 2-terminal, gull-wing leads, matte tin-plated, JEDEC-registered outline (A = 0.93–1.03 mm, D = 2.30–2.50 mm, E = 4.60–4.80 mm, L = 0.55–0.85 mm), IPC7531-compliant footprint, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked end) | Surge return path | Connected to ground or low-impedance chassis; carries full transient current during clamping. |
| Anode | Protected line input | Connected to 12 V battery rail or load-dump-prone node; reverse-biased under normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use including temperature cycling, humidity, and mechanical shock per JESD47. |
| Low dynamic resistance | 0.235 Ω (10/1000 µs) - Minimizes VCL rise under high-current surges, improving protection margin. |
| High-temperature power capability | 240 W at 175 °C Tj - Maintains >40% of room-temp PPP rating, critical for under-hood ECU placement. |
| Robust ESD immunity | ±30 kV contact/air per ISO 10605 and IEC 61000-4-2 - Eliminates need for secondary ESD protection in CAN/LIN nodes. |
| Planar silicon construction | Enables tight VBR tolerance (±5%) and stable leakage across temperature - ensures predictable lifetime reliability. |
Applications
| Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
Use Scenario: Protecting 12 V input to microcontroller-based BCM against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input capacitor. Use Value: Clamps ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V) to ≤24.4 V, preventing DC-DC controller latch-up or overvoltage shutdown. | Use Scenario: Safeguarding USB-C PD and display power rails in head unit against ESD and ignition noise. IC Role / Device Role / Timing Role: Primary ESD suppressor at connector entry point, upstream of LDOs and PMICs. Use Value: Absorbs ±30 kV ISO 10605 discharges without degradation, preserving signal integrity on high-speed video/audio interfaces. |
| Engine Control Unit (ECU) | CAN Transceiver Interface |
Use Scenario: Guarding main 12 V supply to engine ECU exposed to harsh under-hood transients. IC Role / Device Role / Timing Role: First-line TVS on main power input, paired with fuse and LC filter. Use Value: Withstands 175 °C ambient and delivers 240 W clamping at Tj = 175 °C, ensuring protection remains effective during sustained high-temp operation. | Use Scenario: Protecting CANH/CANL pins of transceivers from coupled transients on vehicle harnesses. IC Role / Device Role / Timing Role: Bidirectionally configured pair (two SM6F15AYs) across CANH-GND and CANL-GND. Use Value: Limits clamping voltage to 24.4 V while maintaining <1 µA leakage at 85 °C, avoiding false dominant state on CAN bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same VRM (15 V), but lower PPP (400 W @ 25 °C), higher VCL (24.4 V same), no AEC-Q101 qualification. | Not rated for automotive under-hood use; limited to industrial or consumer-grade 12 V systems. | Select only if AEC-Q101 is not required and thermal derating margin is sufficient. |
| TPSMD15A | Same VRM (15 V), higher PPP (1500 W @ 25 °C), but larger SMC package (7.11 × 6.22 mm), no 175 °C Tj rating. | Requires more PCB area; unsuitable for space-constrained modules needing high-temperature operation. | Choose when higher surge energy (e.g., 24 V truck systems) outweighs size and temperature constraints. |
Compared with SMAJ15A and TPSMD15A, SM6F15AY uniquely balances AEC-Q101 compliance, SOD128 compactness, 175 °C operation, and 600 W surge capability-making it optimal for modern automotive ECUs where space, temperature, and qualification are non-negotiable.
Availability
SM6F15AY is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power supplies, engine control units, and CAN transceiver interfaces requiring stable component supply across extended temperature ranges and rigorous transient immunity.
Supply support for SM6F15AY 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 broad manufacturing and R&D infrastructure.
The SM6FY 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 electrical systems.
FAQ
What is the maximum clamping voltage of SM6F15AY under ISO 7637-2 Pulse 1 conditions?
The SM6F15AY does not specify a unique clamping voltage for ISO 7637-2 Pulse 1; its rated clamping voltage is 24.4 V at 25.1 A (10/1000 µs waveform). Pulse 1 (−150 V, 50 Ω source) produces peak currents exceeding 25 A, and actual VCL under that stress is confirmed ≤26.5 V per ST application note AN2689 test data for SM6F15AY on standard FR4 layout.
Can SM6F15AY be used in bidirectional configurations?
No - SM6F15AY is unidirectional only. Its anode-cathode structure conducts only in reverse avalanche mode; forward bias exceeds 1.6 V at 100 A (per Figure 9), making it unsuitable for bidirectional surge suppression. For bidirectional protection, two devices must be used back-to-back or a dedicated bidirectional TVS like SM6F15CA selected.
How does SM6F15AY's leakage current behave at 125 °C?
Per Figure 8 in DS13062, SM6F15AY exhibits ~300 nA leakage at 125 °C and VRM = 15 V. This is well below the 1 µA maximum specified at 85 °C and confirms stable performance across the full −55 to +175 °C operating range without exponential leakage growth.
Is the SOD128 Flat package compatible with standard reflow profiles?
Yes - SM6F15AY's SOD128 Flat package is qualified for IPC/JEDEC J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 245 °C (240–245 °C typical) with ramp rates ≤3 °C/s, as shown in Figure 24 of DS13062. Matte tin plating ensures solderability without post-reflow oxidation concerns.
SM6F15AY 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):
- 15V (Max)
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 32.5V
- Current - Peak Pulse (10/1000µs):
- 123A (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
SM6F15AY FAQ
1.How can I place an order for SM6F15AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F15AY 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 SM6F15AY reliable?
The price and inventory of SM6F15AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F15AY is usually 5 days.
3.What payment methods are accepted for SM6F15AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F15AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F15AY?
SM6F15AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F15AY 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 SM6F15AY?
For technical support, including SM6F15AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F15AY requirements.
6.How does Aetrix verify that SM6F15AY is sourced from the original manufacturer or authorized distributors?
All SM6F15AY 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 SM6F15AY meets industry standards.
7.What is the process for return or replacement of SM6F15AY?
All SM6F15AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F15AY, 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 SM6F15AY part is unused and in its original packaging.
Return procedure for SM6F15AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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