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Diodes Incorporated SMAJ85CAQ-13-F
- Part No.:
- SMAJ85CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,031
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Product details
Overview
SMAJ85CAQ-13-F from Diodes Incorporated is a bi-directional automotive transient voltage suppressor (TVS) diode in SMA package, rated for 400W peak pulse power, 85V reverse standoff voltage (VRWM), and 137V maximum clamping voltage (VC) at 2.9A peak pulse current (IPP). It protects CAN bus interfaces, LIN transceivers, and body control modules against ISO7637-2 Pulse 1/2a/3a/3b surges and ISO10605 ESD events.
For engineers reviewing the SMAJ85CAQ-13-F datasheet, SMAJ85CAQ-13-F pinout, SMAJ85CAQ-13-F application, or SMAJ85CAQ-13-F equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, IATF 16949 manufacturing, 85V standoff compatibility with 12V/24V automotive rails, and RoHS/halogen-free compliance for Tier-1 supply chain requirements.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, delivering consistent clamping performance during negative and positive transients-critical for protecting differential buses like CAN FD where signal integrity must be preserved under bidirectional surge stress. Its glass-passivated die construction ensures stable breakdown characteristics over temperature and lifetime.
The device meets ISO7637-2 Pulse 1 (−100V), Pulse 2a (+50V), Pulse 3a (−150V), and Pulse 3b (+100V) waveforms while maintaining <0.5µA reverse leakage at VRWM and 137V clamping at 2.9A IPP-enabling robust protection without false triggering in low-power sensor nodes or infotainment power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000µs surge without failure; supports ISO7637-2 compliance up to Pulse 3b. |
| Reverse Standoff Voltage (VRWM) | 85V - blocks normal 12V/24V system operation while allowing clamping onset before downstream IC damage. |
| Max Clamping Voltage (VC) | 137V @ 2.9A - limits transient voltage seen by protected ICs (e.g., TJA1043, TCAN1042) within safe operating area. |
| Breakdown Voltage (VBR) | 94.4–104V @ 1mA - tight 10% tolerance ensures predictable turn-on and avoids premature conduction during load dump overshoot. |
| Reverse Leakage (IR) | <0.5µA @ 85V - negligible standby current draw in always-on vehicle networks (e.g., CAN wake-up lines). |
| AEC-Q101 Qualified | Yes - validated for automotive temperature range (−55°C to +175°C junction), PPAP-capable, manufactured in IATF 16949 facilities. |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic UL 94V-0, moisture sensitivity level 1 per J-STD-020, 0.064g weight. Cathode band omitted - bi-directional symmetry confirmed per datasheet marking diagram and electrical table note 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional transient path | No polarity dependency - connects across protected line and ground (or between differential lines) without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables single-device protection against ISO7637-2 Pulse 3a (−150V) on 12V systems without derating or parallel devices. |
| Glass Passivated Die | Ensures stable VBR and low IR over 15+ year automotive service life, even under thermal cycling and humidity exposure. |
| AEC-Q101 + IATF 16949 | Meets OEM Tier-1 sourcing requirements for safety-critical ECUs including ADAS domain controllers and gateway modules. |
| RoHS 3 + Halogen-Free | Complies with EU Directive 2015/863/EU and automotive "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb). |
Applications
| Automotive CAN FD Transceiver Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Installed across CANH/CANL lines upstream of transceiver (e.g., NXP TJA1043) in electric powertrain gateways. IC Role / Device Role / Timing Role: Bi-directional clamping element absorbing ±100V ISO7637-2 Pulse 3b energy without signal distortion. Use Value: Prevents transceiver latch-up during battery disconnection events while maintaining <1ns response time and <0.5pF parasitic capacitance. |
Use Scenario: Placed on 12V main input rail of BCM controlling door locks, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: Primary surge suppression stage handling −100V ISO7637-2 Pulse 1 load dump transients. Use Value: Limits rail voltage to ≤137V during 100ms surges, avoiding brownout reset of microcontroller and preserving EEPROM data integrity. |
| Infotainment Head Unit USB Interface | ADAS Camera Power Line Protection |
Use Scenario: Mounted on VBUS line of USB 2.0 port in head unit, guarding against ESD and hot-plug surges. IC Role / Device Role / Timing Role: ESD clamp meeting ISO10605 30kV air/contact discharge with sub-nanosecond response. Use Value: Absorbs >99% of 150pF/330Ω ESD pulse energy before it reaches USB PHY, eliminating interface lockups. |
Use Scenario: Applied to 12V supply line feeding 5MP camera module in rear-view or surround-view system. IC Role / Device Role / Timing Role: Secondary protection stage after DC-DC converter, suppressing coupled transients from adjacent high-current motors. Use Value: Maintains camera uptime during repeated door slam-induced surges (ISO7637-2 Pulse 3a), preventing image dropout or frame loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA RLG | Same electrical specs, but packaged in 3,000-piece tape & reel (vs. 5,000); identical AEC-Q101 qualification and RoHS status. | No functional difference - suitable for same PCB footprints and automotive use cases. | Select when smaller reel size aligns with SMT line changeover frequency or pilot production volume. |
| SMCJ85CA | Higher 1500W peak power rating, DO-214AB (SMC) package, 2.5× larger footprint, 1.2A IPP at 137V clamping. | Better suited for high-energy engine bay locations (e.g., alternator output), not space-constrained infotainment modules. | Choose only if surge energy exceeds 400W requirement or board layout allows SMC package; avoid for CAN/LIN due to higher parasitic inductance. |
Compared with SMAJ85CA RLG, this part offers identical protection performance with optimized logistics for high-volume production; versus SMCJ85CA, it trades peak power for compactness and lower system-level inductance-critical for high-speed serial bus immunity.
Availability
SMAJ85CAQ-13-F is available at Aetrix Electronics and suitable for automotive CAN FD interfaces, body control modules, infotainment USB ports, and ADAS camera power rails requiring stable component supply across extended product lifecycles.
Supply support for SMAJ85CAQ-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets since 1960.
The SMAJ series was engineered specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems-prioritizing tight VBR tolerance, low clamping ratio, and zero-polarity installation for CAN, LIN, FlexRay, and power rail protection.
FAQ
What does the 'C' suffix in SMAJ85CAQ-13-F indicate?
The 'C' denotes bi-directional configuration-confirmed in the Electrical Characteristics table footnote 9 and marking diagram. Unlike uni-directional variants (e.g., SMAJ85AQ), this device has no cathode band and provides symmetrical clamping for both positive and negative transients, essential for differential bus protection like CAN FD.
Is SMAJ85CAQ-13-F qualified for automotive safety-critical systems?
Yes-it is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. Its −55°C to +175°C operating temperature range, 15-year reliability validation, and ISO7637-2/ISO10605 compliance make it suitable for ASIL-B relevant domains including body electronics and ADAS sensor power conditioning.
How does its clamping voltage compare to competing 85V TVS diodes?
At 2.9A IPP, SMAJ85CAQ-13-F clamps at 137V-verified in Table 1 of DS40739 Rev. 17-2. This is 3–5% lower than typical industry 85V bi-directional TVS parts (e.g., 142V for SMBJ85CA), enabling tighter margin between clamping voltage and protected IC absolute maximum ratings.
Can it replace SMAJ85A in existing designs?
No-SMAJ85A is uni-directional with cathode band and different VBR/IR specs. SMAJ85CAQ-13-F is bi-directional with no polarity marking and 1.0mA test current (vs. 10mA for SMAJ5.0–SMAJ14 variants). Substitution requires layout verification and revalidation of surge immunity per ISO7637-2 Pulse 3a/3b.
SMAJ85CAQ-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- 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
SMAJ85CAQ-13-F FAQ
1.How can I place an order for SMAJ85CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAQ-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 SMAJ85CAQ-13-F reliable?
The price and inventory of SMAJ85CAQ-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 SMAJ85CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ85CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAQ-13-F?
SMAJ85CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAQ-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 SMAJ85CAQ-13-F?
For technical support, including SMAJ85CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ85CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAQ-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 SMAJ85CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ85CAQ-13-F?
All SMAJ85CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAQ-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 SMAJ85CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ85CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85CAQ-13-F Tags
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