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Diodes Incorporated SMBJ85CAQ-13-F
- Part No.:
- SMBJ85CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,616
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Product details
Overview
SMBJ85CAQ-13-F from Diodes Incorporated is a bi-directional automotive-grade transient voltage suppressor (TVS) diode in SMB package, rated for 600W peak pulse power, 85V reverse standoff voltage (VRWM), and 137V maximum clamping voltage (VC) at 4.4A peak pulse current (IPP). It protects CAN, LIN, and sensor interfaces in engine control units and body electronics against ISO7637-2 Pulse 1/2a/3a/3b and ISO10605 ESD surges.
For engineers reviewing the SMBJ85CAQ-13-F datasheet, SMBJ85CAQ-13-F pinout, SMBJ85CAQ-13-F application, or SMBJ85CAQ-13-F equivalent, this device is selected for high-reliability 12V/24V automotive subsystems requiring AEC-Q101 qualification, IATF 16949 manufacturing, and RoHS-compliant green packaging with <900ppm Br/Cl and <1000ppm Sb.
Technical Context
This bi-directional TVS operates symmetrically across both polarities to clamp transients on differential or floating signal lines-ideal for CAN FD physical layer protection where bidirectional surge immunity is mandatory. Its 1.0mA breakdown test current (IT) and 0.5µA max reverse leakage at VRWM ensure minimal standby loading on low-power automotive sensors.
The device uses silicon avalanche junction technology with a 10×1000µs pulse waveform response (per REA standard), delivering stable clamping within ±5% tolerance across -55°C to +175°C operating range. Thermal derating follows 4.8W/°C above +25°C ambient, supporting placement near heat-generating ECUs without performance loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - sustains single 10×1000µs surges per ISO7637-2 without degradation |
| Reverse Standoff Voltage | 85V - blocks normal 24V system operation while triggering only during overvoltage events |
| Max Clamping Voltage | 137V @ IPP = 4.4A - limits downstream IC stress below 150V absolute maximum ratings |
| Breakdown Voltage | 94.4–104.0V @ IT = 1.0mA - ensures precise, repeatable avalanche initiation threshold |
| Operating Temperature | -55°C to +175°C - supports under-hood deployment in engine management and transmission control modules |
| ESD Rating | ±30kV contact & air discharge per ISO10605 - eliminates need for secondary ESD protection on PCB |
| AEC-Q101 Qualified | Yes - validated for automotive use with PPAP documentation and IATF 16949 production traceability |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic UL 94V-0, 0.1g weight, moisture sensitivity level 1 (J-STD-020). Cathode band omitted - bi-directional symmetry confirmed by "C" suffix and absence of polarity marking per datasheet page 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge path | Both terminals function identically - no polarity required during PCB layout or assembly |
| Case / Body | Thermal conduction path | Exposed copper pad under package bottom enables direct thermal coupling to PCB ground plane for 5W steady-state dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse rating | Handles worst-case ISO7637-2 Pulse 3a (-220V) on 24V systems without failure |
| Bi-directional architecture | Protects differential buses (e.g., CAN H/L) with identical clamping in both directions - no orientation dependency |
| AEC-Q101 qualification | Validated for automotive life-cycle stress including temperature cycling, humidity bias, and mechanical shock |
| Halogen & antimony free | Meets EU "Green" definition (<900ppm Br+Cl, <1000ppm Sb) for eco-compliant vehicle recycling |
| Lead-free matte tin plating | Solderable per MIL-STD-202 Method 208 - compatible with lead-free reflow profiles up to 260°C peak |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protects crankshaft position sensor interface from load dump and alternator ripple-induced transients. IC Role / Device Role / Timing Role: Primary surge suppression element placed directly at connector entry point before signal conditioning amplifier. Use Value: Clamps 137V at 4.4A to keep downstream op-amp input within 150V absolute max, preventing latch-up or permanent damage. |
Use Scenario: Shields LIN bus transceiver pins from ESD events during door module actuation and window switch operation. IC Role / Device Role / Timing Role: Bi-directional clamping device on LIN data line, co-located with transceiver IC. Use Value: Absorbs ±30kV ISO10605 discharges without degrading signal integrity or requiring additional series impedance. |
| CAN FD Gateway | ADAS Camera Power Input |
|
Use Scenario: Safeguards high-speed CAN FD physical layer against coupled noise from adjacent power converters in domain controllers. IC Role / Device Role / Timing Role: Differential-line TVS across CAN_H/CAN_L pair, leveraging symmetrical clamping to maintain common-mode rejection. Use Value: Limits transient-induced common-mode offset to <100mV, preserving bit error rate below 10⁻¹² at 5Mbps. |
Use Scenario: Suppresses load dump spikes on 12V camera power rail during battery disconnect/reconnect sequences. IC Role / Device Role / Timing Role: Primary overvoltage protector upstream of DC-DC converter input stage. Use Value: Withstands 600W pulses without parametric shift, enabling single-stage protection instead of multi-stage RC-TVS designs. |
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 |
|---|---|---|---|
| SAC85C.TCT | Same 85V VRWM, but 400W peak power (vs. 600W); 125V VC @ 3.2A IPP | Limited to lower-energy ISO7637-2 Pulse 2a/3b; not recommended for Pulse 1 (-150V) in 24V systems | Select when cost sensitivity outweighs need for full 600W margin in non-critical sub-systems |
| SMCJ85CA | Same electrical specs but SMC package (larger footprint, 1.5g weight, 1.5W PM(AV)) | Requires more PCB area; better thermal mass for sustained 5W dissipation but incompatible with space-constrained modules | Choose only if existing SMC land pattern exists and thermal design requires higher steady-state power handling |
Compared with SAC85C.TCT and SMCJ85CA, SMBJ85CAQ-13-F uniquely balances 600W surge capacity, AEC-Q101 compliance, and SMB footprint-making it optimal for CAN/LIN nodes where board space, automotive qualification, and full ISO7637-2 coverage are simultaneously required.
Availability
SMBJ85CAQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, CAN FD gateways, and ADAS camera power inputs requiring stable component supply across automotive production lifecycles.
Supply support for SMBJ85CAQ-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 for automotive, industrial, and consumer markets, with manufacturing certified to IATF 16949.
This part belongs to the SMBJ-AQ automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature vehicle environments-prioritizing reliability over general-purpose surge suppression.
FAQ
What does the "C" in SMBJ85CAQ-13-F signify?
The "C" suffix denotes bi-directional functionality, meaning the device provides symmetrical clamping for positive and negative transients without polarity constraints. This is confirmed in the datasheet's marking table (page 3) and electrical characteristics table (page 3), where "C" entries show identical parameters for both directions and no cathode band marking.
Is SMBJ85CAQ-13-F suitable for 48V mild-hybrid systems?
No-it is rated for 85V VRWM and 137V clamping, making it appropriate for 12V/24V architectures only. For 48V systems, Diodes recommends SMBJ130CAQ-13-F (130V VRWM) or SMBJ150CAQ-13-F, which meet ISO7637-2 Pulse 1 requirements up to -200V in higher-voltage domains.
How does its 600W rating compare to standard SMBJ devices?
SMBJ85CAQ-13-F delivers the full 600W peak pulse power specified in the SMBJ family, unlike legacy SMBJ85CA variants that may be derated. This is verified in the Product Summary (page 1) and Maximum Ratings table (page 2), where PPK = 600W is explicitly stated for all SMBJX.X(C)AQ parts.
Can it replace uni-directional SMBJ85AQ-13-F in existing designs?
No-bi-directional and uni-directional versions have different breakdown behavior: SMBJ85AQ-13-F clamps only on reverse bias, while SMBJ85CAQ-13-F clamps on both polarities. Substitution requires circuit review to confirm differential signaling or floating node usage; direct replacement risks improper clamping on forward surges.
SMBJ85CAQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- 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):
- 4.4A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SMBJ85CAQ-13-F FAQ
1.How can I place an order for SMBJ85CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAQ-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 SMBJ85CAQ-13-F reliable?
The price and inventory of SMBJ85CAQ-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 SMBJ85CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ85CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAQ-13-F?
SMBJ85CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAQ-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 SMBJ85CAQ-13-F?
For technical support, including SMBJ85CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAQ-13-F requirements.
6.How does Aetrix verify that SMBJ85CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAQ-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 SMBJ85CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ85CAQ-13-F?
All SMBJ85CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAQ-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 SMBJ85CAQ-13-F part is unused and in its original packaging.
Return procedure for SMBJ85CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAQ-13-F Tags
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