SM6F31AY STMicroelectronics TVS Diode (Uni-directional) (Other) In Stock
SM6F31AY is an automotive-grade unidirectional TVS diode from STMicroelectronics rated at 600 W peak pulse power and 31 V standoff voltage in an SOD128 Flat package. It clamps transient overvoltages to a maximum of 65 V to protect sensitive automotive electronics. Available from authorised distributors worldwide with competitive lead times.
- Manufacturer
- STMicroelectronics
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SM6F31AY Datasheet PDF
- Category
- TVS Diode (Uni-directional)
- Price
- From $0.1620(MOQ 10)
- Temp Range
- -55.0°C to 175.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 600 W peak pulse power dissipation providing robust protection for 24 V and 28 V automotive bus lines against load dump
- Low 65 V maximum clamping voltage at 600 W ensuring connected ICs remain within their 80 V or higher absolute maximum ratings
- AEC-Q101 automotive-qualified SOD128 Flat package enabling reliable operation across the full -40 degrees C to 150 degrees C automotive temperature range
Applications
The SM6F31AY protects automotive body electronics, engine control units, and power distribution modules operating on 24 V bus architectures from destructive load dump transients defined in ISO 7637-2 pulse 5a and 5b profiles. Its 600 W peak power rating and 65 V clamping voltage guard MOSFETs, CAN bus transceivers, and LIN controllers with absolute maximum ratings above 65 V from damage caused by inductive load switching. Commercial vehicle instrumentation and industrial 28 V battery systems, including aerospace ground support equipment, also use this device for EMI and surge protection.
Specifications
| Factory Lead Time | 25Weeks |
| YTEOL | 7.51 |
| Breakdown Voltage-Max | 37.8V |
| Breakdown Voltage-Min | 34.2V |
| Breakdown Voltage-Nom | 36V |
| Clamping Voltage-Max | 65V |
| Configuration | SINGLE, 1 CHANNEL |
| Diode Element Material | SILICON |
| Diode Type | TRANS VOLTAGE SUPPRESSOR DIODE |
| JESD-30 Code | R-PDSO-F2 |
| JESD-609 Code | e3 |
| Non-rep Peak Rev Power Dis-Max | 4000W |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Polarity | UNIDIRECTIONAL |
| Reference Standard | AEC-Q101, IEC-61000-4-2, 4-4 |
| Rep Pk Reverse Voltage-Max | 31V |
| Reverse Current-Max | 0.2 µA |
| Reverse Test Voltage | 31V |
| Surface Mount | YES |
| Technology | AVALANCHE |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | FLAT |
| Terminal Position | DUAL |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.50 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the clamping voltage of SM6F31AY during a 600 W transient pulse and how does that protect a CAN transceiver?
At its rated 600 W peak pulse, the SM6F31AY clamps the bus voltage to a maximum of 65 V. Most automotive CAN transceivers have an absolute maximum bus pin rating of 80 V, so the 65 V clamp provides a 15 V safety margin. This ensures that during a load dump transient on a 24 V bus, the CAN bus lines remain below the transceiver's breakdown threshold and permanent damage is prevented.
How does SM6F31AY compare with SM6F36AY when selecting TVS protection for different automotive voltage buses?
SM6F31AY has a 31 V standoff voltage and 65 V maximum clamping voltage, suited for 24 V and 28 V automotive bus systems. SM6F36AY has a higher 36 V standoff and 76 V clamping, intended for 36 V bus and mild hybrid 48 V applications. Both share the same 600 W peak pulse rating and SOD128 Flat package, so a designer can swap between the two without changing PCB layout, differing only in the voltage variant selection.
At what temperature range does SM6F31AY operate and why does this matter for under-hood automotive installations?
The SM6F31AY is rated for operation from -40 degrees C to 150 degrees C junction temperature, meeting AEC-Q101 Grade 1 automotive qualification. Under-hood environments near the engine bay routinely reach ambient temperatures of 105 degrees C to 125 degrees C. The 150 degrees C junction rating gives adequate thermal margin even when the device conducts 600 W transient pulses in those harsh ambient conditions without risk of thermal runaway.
What is the factory lead time for SM6F31AY and how does the SOD128 Flat package simplify PCB assembly?
STMicroelectronics lists a 25-week factory lead time for SM6F31AY, so automotive tier-1 production planners should include it in long-lead procurement schedules with at least 8 to 10 weeks of safety stock. The SOD128 Flat package is a 2-pad SMD component with a footprint of approximately 3.8 mm x 2.6 mm and a profile under 1.1 mm, making it compatible with standard pick-and-place reflow soldering at peak temperatures up to 260 degrees C.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $0.4300 | $4.30 |
| 100+ | $0.2800 | $28.00 |
| 250+ | $0.2270 | $56.75 |
| 500+ | $0.2000 | $100.00 |
| 1000+ | $0.1770 | $177.00 |
| 6000+ | $0.1620 | $972.00 |
In Stock · 24h Response · Worldwide Shipping
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