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Diodes Incorporated SMAJ8.5CAQ-13-F
- Part No.:
- SMAJ8.5CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CAQ-13-F.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,332
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Product details
Overview
SMAJ8.5CAQ-13-F from Diodes Incorporated is a bi-directional automotive-grade transient voltage suppressor (TVS) diode in SMA package, rated for 400W peak pulse power, 8.5V reverse standoff voltage (VRWM), and 14.4V max clamping voltage (VC) at 27.7A peak pulse current. It protects CAN bus, LIN bus, and sensor interfaces in 12V automotive systems against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ8.5CAQ-13-F datasheet, SMAJ8.5CAQ-13-F pinout, SMAJ8.5CAQ-13-F application, or SMAJ8.5CAQ-13-F equivalent, this device serves as a validated AEC-Q101-qualified surge protection solution for battery-supplied ECUs, body control modules, and infotainment power rails where bidirectional clamping and low leakage (<10µA @ VRWM) are required.
Technical Context
This bi-directional TVS operates symmetrically across both polarities with a breakdown voltage range of 9.44–10.4V at 1.0mA test current and clamps transients to ≤14.4V under 10×1000μs waveform. Its glass-passivated die construction ensures stable performance over -55°C to +175°C junction temperature range.
Designed for automotive environments, it meets ISO7637-2 Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), and Pulse 3b (+100V), and passes ISO10605 ESD testing at ±30kV (air/contact discharge) with 150pF/330Ω network. It is manufactured in IATF 16949-certified facilities and PPAP-capable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges without failure in automotive load-dump or inductive switching events |
| Reverse Standoff Voltage (VRWM) | 8.5V - defines maximum continuous DC operating voltage before significant leakage; matches 12V system nominal with margin |
| Clamping Voltage (VC) | 14.4V @ IPP = 27.7A - limits transient voltage seen by downstream ICs to safe level during ISO7637-2 Pulse 3a (-150V) |
| Breakdown Voltage (VBR) | 9.44–10.4V @ IT = 1.0mA - ensures reliable turn-on before clamping threshold is exceeded |
| Leakage Current (IR) | 10µA @ VRWM - minimal standby power loss and no interference with high-impedance sensor bias networks |
| Operating Temperature | -55°C to +175°C - supports under-hood placement and extended thermal cycling in engine control units |
Pinout & Package
Package: SMA (Surface-Mount Axial), molded plastic UL 94V-0, moisture sensitivity level 1 per J-STD-020, cathode band omitted (bi-directional device).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts surge current in either polarity relative to cathode |
| Cathode | Transient return path (bidirectional) | Connects to reference plane (e.g., chassis ground); completes clamping loop for both polarities |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with stress testing including HTGB, TCT, HTRB, and UHAST |
| Glass-passivated die | Eliminates passivation layer defects; improves long-term reliability under humidity and thermal cycling |
| Bi-directional clamping | Protects AC-coupled lines (e.g., CAN differential pair) without polarity constraints |
| Lead-free & halogen-free | RoHS 3 compliant (<900ppm Br/Cl, <1000ppm Sb); compatible with lead-free reflow profiles |
| Low clamping ratio (VC/VRWM) | 1.69 - tight voltage margin between standoff and clamping enables robust protection of 16V-tolerant receivers |
Applications
| Automotive CAN Bus Protection | Body Control Module Power Input |
|---|---|
|
Use Scenario: Bidirectional transient suppression on CAN_H/CAN_L lines exposed to battery transients and ESD during connector mating. IC Role / Device Role / Timing Role: Passive clamping element placed directly at connector entry point to limit voltage excursion to ≤14.4V. Use Value: Prevents damage to CAN transceivers (e.g., TJA1042) during ISO7637-2 Pulse 3b (+100V) and ISO10605 ±30kV contact discharge. |
Use Scenario: Protection of 12V supply rail feeding microcontroller, LIN transceiver, and LED drivers in door module. IC Role / Device Role / Timing Role: Primary surge clamp upstream of input filter capacitor and LDO regulator. Use Value: Maintains rail integrity during load dump (ISO7637-2 Pulse 5a) and prevents brownout-induced MCU reset via fast response (<1ps) clamping. |
| Passive Entry System Antenna Line | Engine Coolant Temperature Sensor Interface |
|
Use Scenario: ESD protection on RF antenna feedline connecting key fob receiver to external whip antenna. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100pF) placed in series with matching network to avoid signal distortion. Use Value: Survives repeated ±30kV air discharge without parameter shift, preserving 125kHz carrier integrity and read range. |
Use Scenario: Overvoltage protection on analog output line of NTC-based coolant sensor connected to engine control unit ADC input. IC Role / Device Role / Timing Role: High-impedance shunt protector with <10µA leakage to avoid loading 10kΩ–100kΩ sensor divider network. Use Value: Ensures measurement accuracy remains within ±1% error band even after exposure to under-hood ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA-13-F (Diodes Inc.) | No AEC-Q101 qualification; same electrical specs but not PPAP-capable or IATF 16949 manufactured | Acceptable for non-automotive industrial or consumer applications only | Select only if automotive change control, PPAP, or IATF traceability is not required |
| SMBJ8.5CA (Littelfuse) | Same VRWM/VC/IPP, but SMB package (larger footprint, higher thermal mass, 600W rating) | Better thermal handling for repetitive surges; requires PCB area increase (~30% larger pad layout) | Prefer when system-level testing shows thermal derating concerns with SMA package under burst conditions |
Compared with SMAJ8.5CAQ-13-F, the SMAJ8.5CA-13-F lacks automotive qualification documentation and supply chain controls, while SMBJ8.5CA trades compactness for higher surge endurance-making the Q-grade part optimal for space-constrained, production-critical automotive modules.
Availability
SMAJ8.5CAQ-13-F is available at Aetrix Electronics and suitable for automotive electronic control units, body electronics modules, and infotainment power supplies requiring stable component supply with full AEC-Q101 compliance and IATF 16949 traceability.
Supply support for SMAJ8.5CAQ-13-F 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design, manufacturing, and sales operations across Asia, the US, and Europe.
The SMAJ(C)AQ series belongs to Diodes' AEC-Q101-qualified automotive TVS portfolio, engineered specifically for robust transient immunity in 12V/24V vehicle subsystems subject to ISO7637-2 and ISO10605 stress profiles.
FAQ
What is the meaning of the 'Q' suffix in SMAJ8.5CAQ-13-F?
The 'Q' suffix denotes AEC-Q101 qualification, PPAP capability, and manufacture in IATF 16949-certified facilities. It confirms full automotive change control, lot traceability, and stress-test validation including HTGB, TCT, and HTRB-distinguishing it from commercial-grade variants like SMAJ8.5CA-13-F.
Can SMAJ8.5CAQ-13-F be used on a 24V automotive system?
No-it is specified for 12V nominal systems. With VRWM = 8.5V, it would conduct continuously under normal 24V operation due to excessive leakage and thermal stress. For 24V systems, use SMAJ24CAQ-13-F (VRWM = 24V) or SMAJ28CAQ-13-F (VRWM = 28V) to maintain proper standoff margin.
How does the bi-directional configuration affect PCB layout?
Bi-directional devices have no polarity marking; both terminals are functionally identical. Layout requires symmetric trace routing and equal-length paths to protected lines and ground to preserve impedance balance-critical for differential interfaces like CAN. No cathode band alignment is needed.
Is the 400W rating applicable for repetitive pulses?
No-the 400W rating is for non-repetitive 10×1000μs pulses at ≤4 pulses/minute. For repetitive surges, derate using Figure 1 (pulse derating curve) or Figure 6 (steady-state derating). At TL = +75°C, PM(AV) drops to 1.0W; sustained power must stay below this limit to avoid thermal runaway.
SMAJ8.5CAQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ8.5CAQ-13-F FAQ
1.How can I place an order for SMAJ8.5CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CAQ-13-F 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 SMAJ8.5CAQ-13-F reliable?
The price and inventory of SMAJ8.5CAQ-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CAQ-13-F?
SMAJ8.5CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CAQ-13-F 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 SMAJ8.5CAQ-13-F?
For technical support, including SMAJ8.5CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ8.5CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CAQ-13-F 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 SMAJ8.5CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CAQ-13-F?
All SMAJ8.5CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CAQ-13-F, 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 SMAJ8.5CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ8.5CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CAQ-13-F Tags
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