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STMicroelectronics SMA6F23AY
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- Part No.:
- SMA6F23AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F23AY.pdf
- Description:
- TVS DIODE 23VWM 37.8VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,990
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Product details
Overview
SMA6F23AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMA Flat package, designed to clamp transient overvoltages up to 37.8 V (10/1000 µs) at 16.4 A peak pulse current while maintaining low leakage (0.2 µA at 25 °C), enabling robust protection of 24 V automotive power rails against ISO 7637-2 pulses and IEC 61000-4-2 ESD events.
For engineers reviewing the SMA6F23AY datasheet, SMA6F23AY pinout, SMA6F23AY application, or SMA6F23AY equivalent, this device is selected for high-reliability 24 V system surge suppression where junction temperature stability up to 175 °C, flat 1 mm profile, and verified 30 kV ESD immunity are critical design requirements.
Technical Context
This TVS diode employs planar silicon technology to achieve low dynamic resistance (0.573 Ω at 10/1000 µs) and stable clamping voltage across temperature (αT = 9.6 × 10−4/°C), ensuring predictable overvoltage response during repetitive transients in under-hood environments. Its unidirectional configuration supports reverse-biased protection on positive-rail circuits without forward conduction interference.
It meets stringent automotive transient immunity standards including ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V), with validated clamping performance up to 49.2 V at 81 A (8/20 µs) and 400 W peak power capability at Tj = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 23 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system rail margin for 24 V nominal systems. |
| Breakdown Voltage (VBR) | 25.7–28.4 V at 1 mA - Confirmed voltage range at rated test current; ensures reliable triggering above normal operating transients. |
| Clamping Voltage (VCL) | 37.8 V at 16.4 A (10/1000 µs) - Actual voltage seen by protected circuit during worst-case surge; defines downstream component stress level. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - Sustained energy-handling capacity; determines survivability against load dump and ESD events. |
| Leakage Current (IR) | 0.2 µA at 25 °C, 1 µA at 85 °C - Ultra-low reverse bias current minimizes standby power loss and avoids false triggering in high-impedance sensing nodes. |
| Junction Temperature Range | −55 to +175 °C - Enables operation in engine compartment and transmission control units without derating. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact/air discharge (C = 150 pF, R = 330 Ω) - Exceeds Level 4 immunity; eliminates need for external ESD staging in infotainment and body control modules. |
Pinout & Package
The SMA6F23AY uses the JEDEC-registered SMA Flat package (DO-214AC), measuring 2.90 mm × 5.35 mm × 1.10 mm with a 1 mm profile optimized for space-constrained automotive PCB layouts. Lead finish is matte tin plating, compatible with standard reflow profiles per J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient current sink | Connected to protected line (e.g., 24 V supply); conducts surge current to ground when VRM exceeded. |
| Anode | Reference node | Typically tied to system ground; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Flat 1 mm profile | Enables placement beneath connectors or near ECU housings without height interference; supports automated optical inspection. |
| Low dynamic resistance (RD) | 0.573 Ω at 10/1000 µs - Minimizes clamping voltage rise under high-current surges, preserving downstream IC voltage margins. |
| High-temperature operation | Rated for full 600 W surge capability up to Tj = 175 °C - Eliminates thermal derating in hot under-hood locations. |
| ISO 7637-2 compliance | Validated against Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), Pulse 3b (+150 V) - Covers all major automotive transient threats. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
|
Use Scenario: Protection of 24 V supply input against load dump and alternator transients in diesel engine ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at connector entry point to shunt surge energy to chassis ground. Use Value: Clamps to ≤37.8 V at 16.4 A, preventing damage to downstream DC-DC converters and microcontrollers rated for 40 V absolute maximum. |
Use Scenario: ESD and fast transient protection on LIN bus lines connecting door modules and lighting controllers. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 1 V) unidirectional TVS placed adjacent to LIN transceiver pins. Use Value: Maintains signal integrity with <0.2 µA leakage at 25 °C while surviving ±30 kV contact ESD per IEC 61000-4-2. |
| Transmission Control Unit (TCU) Sensor Interface | ADAS Camera Power Rail |
|
Use Scenario: Surge protection for analog sensor inputs (e.g., oil pressure, temperature) exposed to harness-induced transients. IC Role / Device Role / Timing Role: Standoff-voltage-matched TVS (23 V) placed between sensor feed and ADC input to limit fault voltage without affecting measurement range. Use Value: Breakdown tolerance (25.7–28.4 V) ensures no conduction during normal 24 V rail ripple, avoiding signal distortion. |
Use Scenario: Protection of 12 V/24 V camera module power input against ISO 7637-2 Pulse 3a (−220 V) during vehicle ignition. IC Role / Device Role / Timing Role: Primary front-end TVS on camera PCB, mounted with minimal trace inductance to ground plane. Use Value: 400 W peak power handling at 175 °C junction temperature enables uninterrupted operation in sealed, thermally isolated camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F24AY | VRM = 24 V, VBR = 26.7–29.5 V, VCL = 38.9 V @ 16 A | 0.5 V higher stand-off voltage; slightly higher clamping at same current | Select when system nominal voltage is 24 V with tighter margin above 23 V transients. |
| SMA6F22AY | VRM = 22 V, VBR = 24.4–27.0 V, VCL = 35.5 V @ 17.7 A | 1 V lower stand-off voltage; 2.3 V lower clamping than SMA6F23AY at rated current | Choose for 24 V systems requiring lower clamping voltage and acceptable 22 V continuous rating. |
Compared with SMA6F24AY and SMA6F22AY, the SMA6F23AY provides optimal balance for 24 V automotive rails: its 23 V VRM avoids false triggering on normal 24 V ripple while delivering 37.8 V clamping-1.9 V lower than SMA6F24AY and 2.3 V higher than SMA6F22AY-enabling precise coordination with downstream overvoltage thresholds.
Availability
SMA6F23AY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS camera power systems requiring stable component supply with AEC-Q101 assurance and full automotive transient compliance.
Supply support for SMA6F23AY 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 quality certification infrastructure.
The SMA6FY series belongs to ST's automotive-grade Transil TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh-temperature vehicle subsystems where long-term reliability under repeated surge stress is mandatory.
FAQ
What is the maximum clamping voltage of SMA6F23AY under a 10/1000 µs surge?
The maximum clamping voltage is 37.8 V at 16.4 A peak pulse current under 10/1000 µs waveform conditions, measured at Tamb = 25 °C. This value increases with junction temperature at a coefficient of 9.6 × 10−4/°C, reaching approximately 41.2 V at Tj = 175 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Is SMA6F23AY suitable for protecting CAN FD interfaces?
No-SMA6F23AY is not recommended for direct CAN FD bus line protection due to its unidirectional configuration and clamping voltage (37.8 V) exceeding the typical CAN FD common-mode voltage range (±40 V differential, but bus lines operate near 0–5 V). It is intended for power rail protection, not data line ESD suppression; dedicated bidirectional, low-capacitance TVS arrays like ESDCAN03-2BWY are appropriate for CAN FD.
Does SMA6F23AY require a heatsink for 600 W surge dissipation?
No external heatsink is required for single-event 600 W (10/1000 µs) surges because energy dissipation is transient (1 ms duration) and thermal mass of the SMA Flat package plus PCB copper area suffices. Figure 10 in DS12477 shows Zth(j-a) ≈ 40 °C/W for 1 ms pulses on FR4 with recommended footprint; temperature rise remains within 175 °C limit even with minimal copper.
How does SMA6F23AY differ from SMAJ23A in automotive use?
SMA6F23AY is AEC-Q101 qualified, features flat 1 mm profile, and is specified for full 400 W surge capability at 175 °C junction temperature; SMAJ23A lacks AEC-Q101 certification, has taller DO-214AC profile (2.3 mm), and is rated only to 150 °C Tj. SMA6F23AY also exceeds ISO 10605 ±30 kV and passes JESD22 whisker testing-requirements absent in SMAJ23A's industrial-grade specification.
SMA6F23AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA6F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.8V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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:
- SMAflat
SMA6F23AY FAQ
1.How can I place an order for SMA6F23AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F23AY 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 SMA6F23AY reliable?
The price and inventory of SMA6F23AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F23AY is usually 5 days.
3.What payment methods are accepted for SMA6F23AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F23AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F23AY?
SMA6F23AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F23AY 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 SMA6F23AY?
For technical support, including SMA6F23AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F23AY requirements.
6.How does Aetrix verify that SMA6F23AY is sourced from the original manufacturer or authorized distributors?
All SMA6F23AY 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 SMA6F23AY meets industry standards.
7.What is the process for return or replacement of SMA6F23AY?
All SMA6F23AY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F23AY, 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 SMA6F23AY part is unused and in its original packaging.
Return procedure for SMA6F23AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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