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Diodes Incorporated SMBJ85AQ-13-F
- Part No.:
- SMBJ85AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,010
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Product details
Overview
SMBJ85AQ-13-F from Diodes Incorporated is a unidirectional 600W surface-mount automotive transient voltage suppressor (TVS) diode with 85V reverse standoff voltage, 137V max clamping voltage at 4.4A peak pulse current, and AEC-Q101 qualification for under-hood electronics protection against ISO7637-2 Pulse 1/2a/3a/3b and ISO10605 ESD events.
For engineers reviewing the SMBJ85AQ-13-F datasheet, SMBJ85AQ-13-F pinout, SMBJ85AQ-13-F application, or SMBJ85AQ-13-F equivalent, this part is selected for high-reliability 12V/24V automotive power rail surge suppression where clamping voltage margin, IATF 16949 traceability, and RoHS-compliant lead-free plating are mandatory design requirements.
Technical Context
This unidirectional TVS operates as a fast-acting shunt clamp during transients, triggering at 94.4V minimum breakdown voltage (VBR) with 1.0mA test current and limiting voltage to ≤137V at 4.4A IPP under 10×1000μs waveform. Its thermal design supports continuous operation from –55°C to +175°C junction temperature.
The device uses silicon avalanche junction technology in an SMB package with cathode band polarity marking, delivering 5W steady-state power dissipation at TL = +75°C and 600W non-repetitive peak pulse power with 4.8W/°C derating above +25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - Sustains single 10×1000μs surges without failure in automotive load-dump scenarios |
| Reverse Standoff Voltage (VRWM) | 85V - Blocks normal 24V system operation while allowing safe margin before clamping |
| Max Clamping Voltage (VC) | 137V @ IPP = 4.4A - Limits downstream IC voltage stress during ISO7637-2 Pulse 1 (–150V) |
| Breakdown Voltage (VBR) | 94.4V min @ IT = 1.0mA - Ensures reliable turn-on before damaging overvoltage reaches protected circuit |
| Leakage Current (IR) | ≤0.5µA @ VRWM = 85V - Negligible standby power loss in always-on vehicle modules |
| Operating Temperature | –55°C to +175°C - Supports placement near engines, transmissions, and power inverters |
| AEC-Q101 Qualified | Yes - Validated for automotive use with PPAP documentation and IATF 16949 manufacturing control |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic body per UL 94V-0, 0.1g mass, moisture sensitivity level 1 (J-STD-020). Cathode band denotes terminal polarity for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance chassis reference for effective clamping |
| Cathode | Protected line connection | Connected to +24V rail or signal line; cathode band identifies this terminal on PCB |
Key Features
| Feature | Design Value |
|---|---|
| 600W Peak Pulse Power | Withstands severe load-dump transients (ISO7637-2 Pulse 5a/b) without degradation |
| AEC-Q101 Qualification | Validated for automotive under-hood applications with full change control and PPAP support |
| Lead-Free & Halogen-Free | Meets RoHS 3 and "Green" definitions (<900ppm Br/Cl, <1000ppm Sb) for global vehicle compliance |
| Low Clamping Ratio | VC/VRWM = 1.61 - Tight voltage margin preserves headroom for 100V-rated downstream components |
| 100A IFSM Rating | Survives repetitive 8.3ms half-sine surges (e.g., alternator ripple) without bond-wire fusing |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Lines |
|---|---|
Use Scenario: Protects 24V supply input of diesel engine ECUs exposed to alternator load dump and cranking transients. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed directly at ECU power entry point, triggered within nanoseconds of overvoltage onset. Use Value: Limits voltage to ≤137V during –150V ISO7637-2 Pulse 1, preventing damage to MCU power management ICs rated for 100V absolute maximum. |
Use Scenario: Safeguards high-speed CAN FD transceivers (e.g., TJA1044) against ESD and coupled noise on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMBJ85AQ-13-F used on power rails only-CAN data lines require separate bi-directional TVS. Use Value: Maintains <0.5µA leakage at 85V, eliminating standby current impact on battery-sensitive BCM sleep modes. |
| Electric Power Steering (EPS) Motor Driver | ADAS Camera Power Supply |
Use Scenario: Shields H-bridge gate drivers and current sense amplifiers in EPS systems from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp on 24V motor supply rail, coordinated with ceramic bulk capacitance for sub-100ns response. Use Value: 175°C max junction temperature enables mounting on same PCB as MOSFET drivers without thermal derating penalties. |
Use Scenario: Secures 12V input to image sensor SoCs (e.g., Sony IMX series) in front-facing ADAS cameras subjected to roadside ESD and ignition noise. IC Role / Device Role / Timing Role: Primary overvoltage guard upstream of DC-DC converters, operating in parallel with lower-capacitance ESD arrays on signal lines. Use Value: 137V clamping ensures protected SoC remains below its 150V absolute maximum rating during combined ISO10605 contact discharge + ISO7637-2 Pulse 3b events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-Q | Same electrical specs; different packaging (bulk vs. tape-and-reel) and date-code marking format | No functional difference; identical AEC-Q101 qualification and thermal performance | Select SMBJ85AQ-13-F for automated SMT assembly requiring 3,000-piece tape-and-reel delivery |
| SMCJ85A-Q | Higher 1500W peak power, larger SMC package (7.11 × 6.22 mm vs. SMB's 3.94 × 5.59 mm), same 85V VRWM | Used where higher energy absorption is needed (e.g., main battery fuse box), but requires PCB area increase | Choose SMBJ85AQ-13-F when space-constrained under-hood modules demand minimal footprint without sacrificing 600W capability |
Compared with SMBJ85A-Q, the -13-F variant adds tape-and-reel logistics compatibility; versus SMCJ85A-Q, it trades 2.5× peak power for 60% smaller board area-critical for compact ADAS camera modules and EPS control units.
Availability
SMBJ85AQ-13-F is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) input conditioning, and ADAS camera power supply stabilization requiring stable component supply across production lifecycles.
Supply support for SMBJ85AQ-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 with IATF 16949-certified facilities.
This device belongs to Diodes' AEC-Q101-qualified SMBJ-AQ automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in 12V/24V vehicle subsystems with stringent thermal and longevity requirements.
FAQ
Is SMBJ85AQ-13-F bidirectional or unidirectional?
SMBJ85AQ-13-F is unidirectional, indicated by the absence of "C" in its part number (e.g., SMBJ85CAQ would be bidirectional). It features a cathode band marking and clamps only on positive transients relative to its anode connection, making it suitable for DC power rail protection.
What is the maximum allowable junction temperature during surge events?
The absolute maximum junction temperature is +175°C, validated per AEC-Q101 stress testing. During a single 600W 10×1000μs pulse, junction temperature rise depends on thermal resistance (RθJA ≈ 125°C/W for standard SMB layout); typical ΔT is <60°C with proper copper pour, keeping TJ well within limit.
Does this TVS meet ISO7637-2 Pulse 5a (load dump) requirements?
No-Pulse 5a specifies up to 60V superimposed on 14V nominal (up to 74V), exceeding SMBJ85AQ-13-F's 85V VRWM. For load dump, higher VRWM devices like SMBJ130AQ-13-F (130V VRWM) or SMCJ-series parts are required; SMBJ85AQ-13-F targets Pulses 1, 2a, 3a, and 3b.
Can SMBJ85AQ-13-F replace SMBJ85A-13-F in existing designs?
Yes-SMBJ85AQ-13-F is the AEC-Q101 qualified version of SMBJ85A-13-F, sharing identical electrical parameters, SMB package dimensions, and pinout. The "Q" suffix denotes automotive qualification, PPAP capability, and IATF 16949 manufacturing, with no layout or schematic changes needed.
SMBJ85AQ-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:
- 1
- Bidirectional Channels:
- -
- 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
SMBJ85AQ-13-F FAQ
1.How can I place an order for SMBJ85AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AQ-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 SMBJ85AQ-13-F reliable?
The price and inventory of SMBJ85AQ-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 SMBJ85AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ85AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AQ-13-F?
SMBJ85AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AQ-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 SMBJ85AQ-13-F?
For technical support, including SMBJ85AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AQ-13-F requirements.
6.How does Aetrix verify that SMBJ85AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ85AQ-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 SMBJ85AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ85AQ-13-F?
All SMBJ85AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AQ-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 SMBJ85AQ-13-F part is unused and in its original packaging.
Return procedure for SMBJ85AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AQ-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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