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STMicroelectronics SMB6F24AY
- Part No.:
- SMB6F24AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F24AY.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:5,348
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Product details
Overview
SMB6F24AY from STMicroelectronics is a unidirectional automotive-grade transient voltage suppression (TVS) diode in SMB Flat package, designed to clamp ISO 7637-2 load dump and pulse transients up to ±220 V while maintaining 24 V stand-off voltage (VRM), 38.9 V clamping voltage (VCL) at 16 A peak pulse current (IPP), and 600 W peak pulse power (10/1000 µs). It protects CAN/LIN bus interfaces and body control modules in 12 V automotive systems.
For engineers reviewing the SMB6F24AY datasheet, SMB6F24AY pinout, SMB6F24AY application, or SMB6F24AY equivalent, this device is selected for high-reliability ESD/EMI protection where low leakage (0.2 µA @ 25 °C), 175 °C junction operation, and AEC-Q101 qualification are mandatory - especially in infotainment power rails, ADAS sensor supply lines, and gateway ECUs.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior across temperature (αT = 9.6 × 10⁻⁴ /°C), low dynamic resistance (RD = 0.256 Ω), and minimal capacitance (<100 pF at VR = 1 V). Its unidirectional configuration enables asymmetric surge handling - clamping negative transients (e.g., ISO 7637-2 Pulse 1: −150 V) while blocking reverse DC bias.
The SMB Flat package delivers thermal resistance of 120 °C/W (junction-to-ambient, 1 cm² copper pad) and supports reflow soldering per J-STD-020 MSL Level 1. It complies with ISO 10605 (±30 kV contact/air discharge), IEC 61000-4-4 Level 4 (±4 kV), and ISO 7637-2 Pulse 1/2a/3a/3b waveforms - all validated at Tj = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 24 V - blocks normal 12 V system operation while triggering only during overvoltage events ≥26.7 V (VBR min). |
| Clamping Voltage (VCL) | 38.9 V at 16 A (10/1000 µs) - limits downstream IC voltage stress to safe levels during load dump. |
| Peak Pulse Power | 600 W (10/1000 µs) - sustains automotive load dump surges without thermal runaway at Tj = 25 °C. |
| Leakage Current | 0.2 µA @ 25 °C - ensures negligible standby power loss in always-on vehicle networks. |
| Junction Temperature | −55 °C to +175 °C - enables placement near hot engine-control electronics without derating. |
| Dynamic Resistance | 0.256 Ω - minimizes voltage overshoot during fast-rising transients (e.g., ISO 10605 ESD). |
| AEC-Q101 Qualified | Validated for automotive underhood use - includes temperature cycling, humidity bias HAST, and mechanical shock testing. |
Pinout & Package
SMB6F24AY is housed in an SMB Flat surface-mount package (JEDEC DO-214AA), measuring 3.95 mm × 5.60 mm × 1.10 mm with matte tin-plated leads. The flat profile (1 mm height) enables low-profile PCB layouts and improved thermal conduction via copper pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Clamp Output | Connected to protected line (e.g., CAN_H); conducts during positive transients to ground. |
| Anode | Reference Node | Connected to system ground or low-side return path; completes clamping loop during negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Transient Compliance | Meets ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) without degradation. |
| ESD Robustness | Exceeds ISO 10605 ±30 kV (air/contact) and IEC 61000-4-2 Level 4 - eliminates need for secondary ESD protection. |
| High-Temperature Stability | VBR shift ≤ ±10% over −55 °C to +175 °C due to αT = 9.6 × 10⁻⁴ /°C - maintains clamping accuracy in under-hood environments. |
| Low-Leakage Planar Construction | IRM ≤ 0.2 µA @ 24 V, 25 °C - prevents battery drain in always-on domains like telematics and alarm systems. |
| Reflow-Compatible Packaging | MSL Level 1, J-STD-020-compliant profile up to 245 °C peak - supports high-yield automated SMT assembly. |
Applications
| Infotainment Power Rail Protection | CAN Bus Physical Layer Protection |
|---|---|
|
Use Scenario: Protecting 5 V/3.3 V DC-DC converter outputs powering head unit processors and display drivers from battery line transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive spikes (e.g., ISO 7637-2 Pulse 2a) while blocking reverse bias during normal operation. Use Value: Prevents latch-up or permanent damage to PMICs and SoCs by limiting voltage to ≤38.9 V during 16 A surges. |
Use Scenario: Shielding CAN_H/CAN_L differential pair against ESD and coupled noise in gateway ECUs. IC Role / Device Role / Timing Role: Placed on each CAN line to ground; absorbs ±30 kV ESD events without signal distortion. Use Value: Maintains <100 pF junction capacitance at 1 V reverse bias - avoids CAN bit timing skew or reflection issues. |
| Body Control Module (BCM) Input Protection | ADAS Camera Power Supply Protection |
|
Use Scenario: Safeguarding wake-up inputs (e.g., door handle sensors) connected to 12 V battery against load dump and jump-start surges. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp on BCM microcontroller GPIOs tied to external switches. Use Value: Withstands 600 W (10/1000 µs) pulses at 175 °C junction temperature - ensures reliability over 15-year vehicle life. |
Use Scenario: Securing 12 V input to camera module DC-DC converters exposed to engine bay transients. IC Role / Device Role / Timing Role: Mounted upstream of buck regulator to prevent input overvoltage shutdown or MOSFET avalanche failure. Use Value: Clamps ISO 7637-2 Pulse 1 (−150 V) to ≤38.9 V within 1 ns - avoids brownout-induced image corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Same SMB package, but rated for 600 W (10/1000 µs); VBR min = 26.7 V, VCL = 38.9 V at 16 A - identical electrical specs. | No AEC-Q101 qualification; not validated for automotive temperature cycling or humidity bias. | Select SMB6F24AY for production automotive programs; SMBJ24A only for industrial prototypes or non-safety-critical designs. |
| SMCJ24A | Larger SMC package (7.11 mm × 6.22 mm); same VBR/VCL but higher 1500 W peak power rating - physically incompatible with SMB footprint. | Higher thermal mass allows longer surge duration handling but increases board area and cost. | Choose SMB6F24AY when space-constrained PCB layout and AEC-Q101 compliance are mandatory. |
Compared with SMBJ24A and SMCJ24A, SMB6F24AY uniquely combines AEC-Q101 qualification, SMB Flat form factor, and verified ISO 7637-2 Pulse 3a/3b performance - making it the only drop-in solution for automotive Tier-1 body electronics requiring zero derating at 175 °C.
Availability
SMB6F24AY is available at Aetrix Electronics and suitable for automotive infotainment systems, CAN gateway modules, body control units, and ADAS camera power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMB6F24AY 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 ICs with vertical manufacturing capabilities and broad automotive qualification expertise.
SMB6F24AY belongs to ST's SMB6FxxAY series - a family of AEC-Q101-qualified unidirectional TVS diodes engineered specifically for robust transient suppression in 12 V and 24 V automotive electrical architectures.
FAQ
What is the maximum clamping voltage of SMB6F24AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 38.9 V at 16 A peak pulse current for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases linearly with junction temperature at a coefficient of 9.6 × 10⁻⁴ /°C, reaching ~42.5 V at Tj = 175 °C.
Does SMB6F24AY meet ISO 10605 ESD requirements for automotive applications?
Yes - SMB6F24AY exceeds ISO 10605 requirements for both air and contact discharge: it withstands ±30 kV (C = 150 pF, R = 330 Ω) and ±30 kV (C = 330 pF, R = 330 Ω) without parametric shift or failure, validated per AEC-Q101 stress test conditions.
Can SMB6F24AY be used in 24 V commercial vehicle systems?
No - SMB6F24AY is specified for 24 V stand-off (VRM), making it suitable only for 12 V nominal systems. For 24 V battery architectures, ST recommends SMB6F33AY (VRM = 33 V) or SMB6F36AY (VRM = 36 V), both sharing identical AEC-Q101 qualification and SMB Flat packaging.
What is the thermal resistance junction-to-ambient for SMB6F24AY on standard FR4 PCB?
With the recommended IPC7531 footprint (5.84 mm × 1.20 mm pad per lead, 2.07 mm spacing), Rth(j-a) is 120 °C/W for a single pulse. This improves to ~85 °C/W with 1 cm² copper area under each lead, enabling sustained surge handling without exceeding 175 °C junction limit.
SMB6F24AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- SMB6FxxAY
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 16A
- 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:
- SMBflat
SMB6F24AY FAQ
1.How can I place an order for SMB6F24AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F24AY 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 SMB6F24AY reliable?
The price and inventory of SMB6F24AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F24AY is usually 5 days.
3.What payment methods are accepted for SMB6F24AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F24AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F24AY?
SMB6F24AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F24AY 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 SMB6F24AY?
For technical support, including SMB6F24AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F24AY requirements.
6.How does Aetrix verify that SMB6F24AY is sourced from the original manufacturer or authorized distributors?
All SMB6F24AY 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 SMB6F24AY meets industry standards.
7.What is the process for return or replacement of SMB6F24AY?
All SMB6F24AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F24AY, 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 SMB6F24AY part is unused and in its original packaging.
Return procedure for SMB6F24AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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