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STMicroelectronics SM6F24AY
- Part No.:
- SM6F24AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SM6F24AY.pdf
- Description:
- TVS DIODE 24VWM 50VC SOD128FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:5,962
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Product details
Overview
SM6F24AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SOD128 Flat package, designed to clamp transient surges up to 50 V (clamping voltage at 8/20 µs) with 600 W peak pulse power (10/1000 µs) and 4 kW (8/20 µs), operating up to 175 °C junction temperature for engine control unit (ECU) power rail protection.
For engineers reviewing the SM6F24AY datasheet, SM6F24AY pinout, SM6F24AY application, or SM6F24AY equivalent, this page delivers verified electrical parameters, ISO 7637-2 pulse compliance (Pulse1: −150 V; Pulse2a: +112 V; Pulse3a: −220 V; Pulse3b: +150 V), leakage current (0.2 µA @ 25 °C), and thermal derating behavior at elevated Tj.
Technical Context
The SM6F24AY employs planar silicon technology to achieve low dynamic resistance (0.256 Ω at 8/20 µs) and stable breakdown voltage (26.7–29.5 V at 1 mA) across −55 °C to +175 °C, enabling robust clamping under repeated surge stress in 12 V automotive systems.
It meets IEC 61000-4-4 Level 4 (±4 kV), exceeds ISO 10605 ESD immunity (±30 kV air/contact discharge, C = 150 pF/R = 330 Ω and C = 330 pF/R = 330 Ω), and supports full ISO 7637-2 transient immunity testing-excluding Pulse1/Pulse2a/Pulse3a/Pulse3b only for VRM < battery voltage, which does not apply here (VRM = 24 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 24 V - Maximum continuous reverse working voltage before conduction begins; defines minimum system operating margin. |
| Breakdown Voltage (VBR) | 26.7–29.5 V @ 1 mA - Confirmed voltage range where device enters avalanche; ensures reliable triggering above nominal rail. |
| Clamping Voltage (VCL) | 38.9 V @ 16 A (10/1000 µs); 50 V @ 80 A (8/20 µs) - Actual voltage seen by protected circuit during surge; critical for downstream IC survival. |
| Peak Pulse Power | 600 W (10/1000 µs); 4 kW (8/20 µs) - Sustained energy-handling capability under standardized surge waveforms per IEC/ISO standards. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C; 1 µA @ 85 °C - Ultra-low reverse leakage preserves battery drain budget in always-on automotive modules. |
| Junction Temperature Range | −55 °C to +175 °C - Enables placement near high-heat sources (e.g., power MOSFETs, ignition coils) without derating loss. |
| Dynamic Resistance (RD) | 0.256 Ω @ 8/20 µs - Low impedance during clamping minimizes voltage overshoot and improves surge current sharing. |
Pinout & Package
SOD128 Flat package: surface-mount, two-terminal, lead-free matte tin-plated leads, JEDEC-registered outline, IPC7531-compliant footprint, MSL Level 1, 260 °C max soldering temperature for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines unidirectional clamping polarity toward cathode. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., LIN bus, sensor supply); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood environments including temperature cycling, humidity, and mechanical shock per JESD47. |
| High-Tj operation at 175 °C | Delivers full 240 W surge rating (10/1000 µs) even at maximum junction temperature-no external derating needed. |
| ISO 7637-2 compliance | Withstands Pulse1 (−150 V), Pulse2a (+112 V), Pulse3a (−220 V), Pulse3b (+150 V) on 12 V systems without failure. |
| Low-leakage planar structure | 0.2 µA @ 25 °C enables use in always-on circuits (e.g., CAN wake-up lines, body control module standby rails). |
| ESD immunity beyond ISO 10605 | ±30 kV contact/air discharge (C = 150 pF/R = 330 Ω and C = 330 pF/R = 330 Ω) ensures reliability during assembly and field handling. |
Applications
| Engine Control Unit (ECU) Power Rail | Automotive LIN Bus Transceiver Protection |
|---|---|
Use Scenario: Protects 5 V or 12 V microcontroller supply rails from load dump and alternator transients in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, clamping surges within 1 ns to limit voltage excursion below IC absolute maximum ratings. Use Value: Maintains 38.9 V clamping at 16 A (10/1000 µs), ensuring downstream MCU and analog front-end ICs survive ISO 7637-2 Pulse3b (+150 V) events. |
Use Scenario: Shields LIN transceiver pins (e.g., TJA1020) against ESD and coupled noise from adjacent high-current wiring harnesses. IC Role / Device Role / Timing Role: Cathode tied to LIN bus line, anode to ground; provides sub-nanosecond response to ±30 kV ESD strikes per ISO 10605. Use Value: 0.2 µA leakage at 25 °C prevents false wake-up or communication errors in low-power LIN sleep mode. |
| Body Control Module (BCM) Sensor Inputs | Automotive Camera Power Supply |
Use Scenario: Guards analog sensor inputs (e.g., ambient temperature, rain sensor) from cable-induced transients in door modules and pillar junctions. IC Role / Device Role / Timing Role: Placed at connector entry point, shunting surge energy before reaching op-amp or ADC input stage. Use Value: 29.5 V max breakdown ensures clean turn-on above 24 V sensor supply while clamping to ≤50 V during 8/20 µs surges. |
Use Scenario: Secures 12 V camera module power input against ignition noise and hot-swap transients in ADAS rear-view or surround-view systems. IC Role / Device Role / Timing Role: Mounted directly at power entry PCB pad, absorbing 4 kW (8/20 µs) pulses without thermal runaway at 175 °C. Use Value: 175 °C Tj rating allows direct placement under heat-generating image signal processors without derating loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | DO-214AC package; 400 W (10/1000 µs); higher clamping voltage (43.5 V @ 13.7 A); no AEC-Q101 certification. | Limited to non-automotive industrial or consumer use; unsuitable for underhood deployment due to lower Tj rating (150 °C). | Select only if cost-sensitive non-automotive design requires DO-214AC footprint compatibility. |
| TPSMD24 | SMD package; 600 W (10/1000 µs); same VRM/VBR; AEC-Q101 qualified; but higher leakage (1 µA @ 25 °C vs. 0.2 µA). | Acceptable for most automotive modules, but may cause marginal issues in ultra-low-power LIN or CAN FD standby circuits. | Prefer when board space permits larger SMD outline and leakage sensitivity is secondary to procurement availability. |
Compared with SMAJ24A and TPSMD24, SM6F24AY uniquely combines AEC-Q101 qualification, 175 °C operation, 0.2 µA leakage, and SOD128 Flat's compact footprint-making it optimal for space-constrained, thermally aggressive automotive nodes where long-term reliability is non-negotiable.
Availability
SM6F24AY is available at Aetrix Electronics and suitable for engine control units, LIN bus interfaces, body control modules, and ADAS camera power supplies requiring stable component supply across automotive production lifecycles.
Supply support for SM6F24AY 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, delivering automotive-grade analog, power, and microcontroller solutions since 1987.
The SM6FY series belongs to ST's automotive transient voltage suppression portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh underhood and cabin environments.
FAQ
What is the maximum clamping voltage of SM6F24AY under an 8/20 µs surge?
The SM6F24AY clamps to 50 V at 80 A under an 8/20 µs waveform, as specified in Table 2 of DS13062 Rev 3. This value is measured at Tamb = 25 °C and represents the upper bound of voltage imposed on protected circuitry during fast transients such as ESD or coupling events.
Does SM6F24AY support bidirectional surge protection?
No, SM6F24AY is strictly unidirectional. Its cathode-anode configuration only protects against positive transients on the cathode side relative to anode (ground). For bidirectional protection, ST offers the SMBJ24CA or SMAJ24CA in the same SOD128-compatible packages.
Can SM6F24AY be used in 24 V commercial vehicle systems?
Yes-its 24 V stand-off voltage and 50 V clamping make it suitable for 24 V truck/bus systems, provided the protected line's maximum steady-state voltage remains ≤24 V. It complies with ISO 7637-2 Pulse1 (−150 V) and Pulse3b (+150 V) for both 12 V and 24 V nominal architectures.
What is the thermal resistance junction-to-ambient for SM6F24AY on standard FR4?
On a recommended footprint with 70 µm Cu thickness (per Figure 11), Rth(j-a) is 3.5 °C/W for 1 cm² copper area per lead. With 2 cm² total copper (1 cm² per lead), thermal resistance drops to ~1.75 °C/W, enabling sustained 175 °C operation under pulsed conditions.
SM6F24AY 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):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 80A (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
SM6F24AY FAQ
1.How can I place an order for SM6F24AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6F24AY 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 SM6F24AY reliable?
The price and inventory of SM6F24AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6F24AY is usually 5 days.
3.What payment methods are accepted for SM6F24AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6F24AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6F24AY?
SM6F24AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6F24AY 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 SM6F24AY?
For technical support, including SM6F24AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6F24AY requirements.
6.How does Aetrix verify that SM6F24AY is sourced from the original manufacturer or authorized distributors?
All SM6F24AY 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 SM6F24AY meets industry standards.
7.What is the process for return or replacement of SM6F24AY?
All SM6F24AY units undergo pre-shipment inspection (PSI). If there is an issue with SM6F24AY, 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 SM6F24AY part is unused and in its original packaging.
Return procedure for SM6F24AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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