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STMicroelectronics SM6F26AY
- Part No.:
- SM6F26AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F26AY.pdf
- Description:
- TVS DIODE 26VWM 53.5VC SOD128FLT
- Quantity:
- Payment:
- Shipping:
Inventory:7,692
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Product details
Overview
SM6F26AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SOD128 Flat package, designed to clamp transient surges up to 42.1 V (clamping voltage at 14.9 A, 10/1000 µs) with 600 W peak pulse power rating and 0.2 µA max leakage at 25 °C. It protects CAN, LIN, and sensor supply lines in 12 V automotive systems against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 3b: +150 V) and ESD per ISO 10605 (±30 kV air/contact).
For engineers reviewing the SM6F26AY datasheet, SM6F26AY pinout, SM6F26AY application, or SM6F26AY equivalent, this device is selected for high-reliability 12 V battery rail protection where low leakage, 175 °C junction operation, and validated ISO 7637-2 compliance are mandatory - not generic surge suppression.
Technical Context
The SM6F26AY uses planar silicon technology to achieve stable breakdown behavior across temperature (αT = 9.7 × 10−4/°C) and low dynamic resistance (RD = 0.685 Ω at 10/1000 µs), enabling precise clamping under fast transients. Its unidirectional configuration supports DC-biased lines like power rails and sensor outputs without reverse conduction path concerns.
Rated for Tj up to 175 °C, it maintains 240 W surge capability at maximum junction temperature and complies with IEC 61000-4-4 Level 4 (4 kV), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1/2a/3a/3b - all verified per manufacturer test reports in DS13062 Rev 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 26 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system operating margin for 12 V battery circuits. |
| Breakdown Voltage (VBR) | 28.9–31.9 V at 1 mA - Confirmed min/typ/max range ensures reliable triggering above nominal rail while avoiding false trips. |
| Clamping Voltage (VCL) | 42.1 V at 14.9 A (10/1000 µs) - Actual voltage seen by protected IC during worst-case surge; defines safe downstream voltage ceiling. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capacity under standard automotive surge waveform; validated at Tj = 25 °C. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ultra-low reverse current preserves battery life and avoids loading of high-impedance sensor inputs. |
| Junction Temperature Range | −55 to +175 °C - Enables placement near hot engine control units without derating; supports under-hood deployment. |
| ESD Withstand (ISO 10605) | ±30 kV (air & contact, C = 330 pF/R = 330 Ω) - Exceeds automotive ESD immunity requirements for exposed connectors and harnesses. |
Pinout & Package
SOD128 Flat package: surface-mount, two-terminal, unidirectional configuration. Dimensions per JEDEC MO-290: length 4.7 mm, width 2.4 mm, height 1.0 mm; matte tin-plated leads compliant with J-STD-002 and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Low-side connection to ground reference | Connected to chassis or local ground plane; establishes reference for clamping action on cathode side. |
| Cathode (K) | High-side connection to protected line | Placed in series with 12 V supply or signal line; conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| 175 °C junction operation | Enables direct mounting on power modules or ECUs without thermal derating; maintains 240 W surge capability at Tj = 175 °C. |
| Low dynamic resistance (0.685 Ω) | Minimizes VCL rise under high-current transients, reducing stress on downstream ASICs and microcontrollers. |
| Planar silicon construction | Delivers stable VBR temperature coefficient (9.7 × 10−4/°C) and long-term reliability in high-vibration environments. |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Tested to −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), +150 V (Pulse 3b); no derating required for 12 V systems. |
Applications
| Engine Control Unit (ECU) Power Rail Protection | CAN FD Transceiver Line Protection |
|---|---|
|
Use Scenario: Installed between 12 V battery feed and ECU main regulator input to suppress load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed in parallel with power rail; triggers within nanoseconds to limit voltage to ≤42.1 V. Use Value: Prevents overvoltage damage to LDOs and PMICs during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V) events. |
Use Scenario: Mounted on CAN_H/CAN_L lines adjacent to transceiver to absorb ESD and coupled noise from harnesses. IC Role / Device Role / Timing Role: Low-capacitance (≤100 pF at 1 V) unidirectional TVS shunting transients to ground without distorting 5 Mbps CAN FD signals. Use Value: Maintains signal integrity while passing ±30 kV ISO 10605 ESD tests and suppressing common-mode surges per ISO 7637-2 Pulse 3a. |
| Body Control Module (BCM) Sensor Supply Protection | Automotive Camera Module Power Input |
|
Use Scenario: Protecting 5 V or 3.3 V sensor supply rails derived from 12 V battery via DC-DC converter in BCM. IC Role / Device Role / Timing Role: Stand-off voltage (26 V) isolates normal operation; clamps only during >28.9 V surges, avoiding interference with regulation. Use Value: Eliminates false resets and latch-up in Hall-effect and temperature sensors caused by load dump-induced overshoot. |
Use Scenario: Securing 12 V input to camera module PCB mounted behind rearview mirror or in headlight housing. IC Role / Device Role / Timing Role: High-temperature-rated (175 °C) TVS absorbing under-hood transients while maintaining low leakage (<1 µA at 85 °C). Use Value: Ensures continuous video output during engine cranking and stop-start cycles without thermal drift or leakage-induced brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same VRWM (26 V), but lower PPP (400 W), higher VCL (42.8 V @ 13.1 A), SOD-123 package (smaller thermal mass). | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 1 compliance without parallel devices. | Select SMAJ26A only for cost-sensitive non-critical 12 V accessories where full AEC-Q101 and 600 W rating are not mandated. |
| TPSMD26 | Same VRWM and PPP, but bidirectional configuration (VRWM = ±26 V); higher leakage (1 µA @ 25 °C); SMC package. | Required for AC-coupled or floating signal lines; introduces unnecessary conduction path on DC rails. | Choose TPSMD26 only for differential bus protection (e.g., LIN bus) where symmetrical clamping is needed; avoid for power rail use. |
Compared with SMAJ26A and TPSMD26, SM6F26AY uniquely combines AEC-Q101 qualification, 600 W surge rating in SOD128 Flat, and 0.2 µA leakage - making it the only choice for space-constrained, high-reliability 12 V power rail protection in engine bay ECUs.
Availability
SM6F26AY is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power inputs, and CAN FD transceiver protection requiring stable component supply across extended temperature and high-surge environments.
Supply support for SM6F26AY 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 AEC-Q100/101 validation infrastructure.
The SM6FY series belongs to ST's automotive-grade transient voltage suppression portfolio, engineered specifically for under-hood 12 V system protection with emphasis on ISO 7637-2 compliance, 175 °C operation, and planar reliability.
FAQ
What is the maximum clamping voltage of SM6F26AY under ISO 7637-2 Pulse 1 conditions?
The SM6F26AY clamps to 42.1 V at 14.9 A for the 10/1000 µs waveform, which directly covers ISO 7637-2 Pulse 1 (−150 V) energy level. Its dynamic resistance of 0.685 Ω ensures predictable VCL scaling across current, and test data in DS13062 Rev 3 confirms no degradation at Tj = 175 °C.
Can SM6F26AY be used on a 24 V truck system?
No - SM6F26AY is rated for 26 V stand-off and intended for 12 V automotive systems. For 24 V applications, ST specifies SM6F36AY (36 V VRWM) or SM6F40AY (40 V VRWM). Using SM6F26AY on 24 V rails risks premature breakdown and accelerated wear due to sustained reverse bias above VRWM.
Does SM6F26AY require a heatsink for 175 °C operation?
No external heatsink is required. The SOD128 Flat package achieves Rth(j-a) = 120 °C/W on a 1 cm² copper pad (per Figure 11), and its 175 °C rating is validated with standard FR4 PCB layout. Derating curves in Figure 3 confirm 240 W capability at Tj = 175 °C using only recommended footprint.
How does SM6F26AY differ from generic SMBJ26A in automotive use?
SM6F26AY is AEC-Q101 qualified, has lower leakage (0.2 µA vs. 1 µA), tighter VBR tolerance (28.9–31.9 V vs. 28.9–34.4 V), and is tested to full ISO 7637-2 Pulse 1/2a/3a/3b. SMBJ26A lacks automotive qualification, exhibits higher VCL (45.7 V), and fails Pulse 1 without derating - making it unsuitable for safety-critical ECU power rails.
SM6F26AY 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):
- 26V (Max)
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 75A (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
SM6F26AY FAQ
1.How can I place an order for SM6F26AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F26AY 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 SM6F26AY reliable?
The price and inventory of SM6F26AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F26AY is usually 5 days.
3.What payment methods are accepted for SM6F26AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F26AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F26AY?
SM6F26AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F26AY 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 SM6F26AY?
For technical support, including SM6F26AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F26AY requirements.
6.How does Aetrix verify that SM6F26AY is sourced from the original manufacturer or authorized distributors?
All SM6F26AY 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 SM6F26AY meets industry standards.
7.What is the process for return or replacement of SM6F26AY?
All SM6F26AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F26AY, 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 SM6F26AY part is unused and in its original packaging.
Return procedure for SM6F26AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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