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Diodes Incorporated SMBJ45AQ-13-F
- Part No.:
- SMBJ45AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,096
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Product details
Overview
SMBJ45AQ-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for automotive power-line surge protection. It features a 45V reverse standoff voltage (VRWM), 50.0V minimum breakdown voltage (VBR), 72.7V maximum clamping voltage (VC) at 8.3A peak pulse current, and AEC-Q101 qualification for under-hood applications including engine control units and body electronics.
For engineers reviewing the SMBJ45AQ-13-F datasheet, SMBJ45AQ-13-F pinout, SMBJ45AQ-13-F application, or SMBJ45AQ-13-F equivalent, key selection criteria include ISO7637-2 Pulse 1/2a/3a/3b compliance, 100A non-repetitive surge capability, unidirectional polarity marking, and SMB package thermal performance in high-temperature automotive environments.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating when transient voltage exceeds its breakdown threshold to divert surge energy to ground. Its unidirectional configuration provides forward conduction only during negative transients, making it suitable for DC-biased lines like 12V/24V battery rails.
It meets stringent automotive immunity requirements: ISO10605 ESD (±30kV air/contact), ISO7637-2 Pulse 1 (−150V), Pulse 2a (+112V), Pulse 3a (−220V), and Pulse 3b (+150V). Thermal derating follows a linear 4.8W/°C slope above +25°C ambient, with PM(AV) = 5.0W at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - Sustains single 10×1000μs transients without failure under defined test conditions |
| Reverse Standoff Voltage | 45V - Maximum continuous DC operating voltage before clamping begins |
| Clamping Voltage | 72.7V @ 8.3A - Limits downstream voltage to safe level during ISO7637-2 Pulse 1/2a/3a/3b events |
| Breakdown Voltage | 50.0–55.3V @ 1mA - Confirmed VBR range ensures reliable turn-on margin above VRWM |
| Peak Forward Surge Current | 100A @ 8.3ms half-sine - Withstands alternator load dump surges per ISO7637-2 Pulse 5a/b |
| Operating Temperature | −55°C to +175°C - Validated junction temperature range for under-hood placement |
| AEC-Q101 Qualified | Yes - Certified for automotive use with PPAP capability and IATF 16949 manufacturing |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic body with UL 94V-0 flammability rating, 0.1g weight, and matte tin lead finish. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient current sink | Connected to ground or low-impedance return path; conducts during overvoltage events |
| Anode | Protected line input | Connected to 45V-rated supply rail (e.g., automotive 12V/24V system); blocks reverse leakage ≤0.5µA |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade surge suppression | 600W peak pulse power validated per ISO7637-2 and ISO10605, enabling direct integration into ECU power inputs |
| Controlled clamping response | 72.7V VC at 8.3A ensures protected ICs (e.g., CAN transceivers, microcontrollers) remain below absolute maximum ratings |
| High-temperature reliability | Rated for TJ = −55°C to +175°C with linear derating, supporting placement near engines or power converters |
| Green manufacturing compliance | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), RoHS 3 compliant, and lead-free per MIL-STD-202 |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
Use Scenario: Protects 12V supply rail of gasoline/diesel engine ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO/regulator input to clamp ISO7637-2 Pulse 5a (load dump) surges. Use Value: Prevents regulator latch-up or destruction by limiting transient voltage to ≤72.7V during 100A 8.3ms surges. |
Use Scenario: Shields LIN transceiver data lines from ESD and coupled noise in door modules and seat controls. IC Role / Device Role / Timing Role: Bidirectional clamping not applicable here; SMBJ45AQ-13-F used on LIN master VBAT supply, not signal line. Use Value: Maintains LIN bus availability during ±30kV ESD events by preventing upstream power rail collapse. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Secures 12V input to image sensor SoCs in front/rear-view cameras exposed to vehicle-level surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on camera module power entry point, upstream of DC-DC converter. Use Value: Enables uninterrupted video capture during ISO7637-2 Pulse 3b (+150V) transients induced by ignition switching. |
Use Scenario: Guards H-bridge gate driver IC supply against back-EMF spikes during EPS motor commutation. IC Role / Device Role / Timing Role: Fast-response TVS on 12V logic supply rail feeding motor control ASICs and MOSFET drivers. Use Value: Avoids false fault triggering or reset events by holding supply voltage within 5V tolerance during 220V negative pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-Q | Same electrical specs and AEC-Q101 qualification; differs only in tape-and-reel packaging (no "-13-F" suffix) | No functional difference; identical use in production PCB assembly | Select when standard reel packaging suffices and no special carrier requirements exist |
| SMCJ45A-Q | Higher 1500W peak power rating, larger SMC package (7.11 × 6.22 mm vs. SMB's 3.94 × 5.59 mm), same VRWM/VC | Better suited for higher-energy transients but requires 2.5× more board area and has higher thermal mass | Choose only if system-level testing shows 600W insufficient; otherwise SMBJ45AQ-13-F optimizes space and cost |
Compared with SMBJ45A-Q, this part offers identical protection performance with optimized logistics handling; versus SMCJ45A-Q, it delivers proven 600W capability in a 40% smaller footprint-critical for space-constrained ADAS and EPS modules.
Availability
SMBJ45AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and electric power steering designs requiring stable component supply across automotive production lifecycles.
Supply support for SMBJ45AQ-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.
This device belongs to Diodes' AEC-Q101-qualified SMBJ automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature vehicle subsystems.
FAQ
What is the polarity configuration of SMBJ45AQ-13-F?
SMBJ45AQ-13-F is a unidirectional TVS diode, indicated by the absence of "C" in its part number and presence of a cathode band marking. It conducts only during reverse-biased overvoltage events-ideal for protecting positive-rail DC systems like automotive 12V/24V supplies.
Does SMBJ45AQ-13-F meet ISO7637-2 Pulse 5a (load dump) requirements?
Yes-it withstands 100A peak forward surge current at 8.3ms half-sine waveform, satisfying ISO7637-2 Pulse 5a (load dump) up to 120V for 400ms. Its 72.7V clamping voltage ensures downstream regulators remain within safe operating limits during such events.
Can SMBJ45AQ-13-F be used on signal lines like CAN or LIN?
No-this unidirectional 45V VRWM device is intended for power rail protection only. Signal-line protection requires lower capacitance (<100pF), lower clamping voltage, and often bidirectional configurations; use Diodes' SP1003 or D3V3F4U series instead for CAN/LIN interfaces.
What is the thermal resistance from junction to ambient for SMBJ45AQ-13-F?
The datasheet does not specify RθJA directly, but steady-state power dissipation is rated at 5.0W at TL = +75°C. Using the SMB package's typical thermal characteristics and layout guidelines (e.g., 25mm² copper pad), RθJA is approximately 50°C/W under standard JEDEC test conditions.
SMBJ45AQ-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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
SMBJ45AQ-13-F FAQ
1.How can I place an order for SMBJ45AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AQ-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 SMBJ45AQ-13-F reliable?
The price and inventory of SMBJ45AQ-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 SMBJ45AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ45AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AQ-13-F?
SMBJ45AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AQ-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 SMBJ45AQ-13-F?
For technical support, including SMBJ45AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AQ-13-F requirements.
6.How does Aetrix verify that SMBJ45AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ45AQ-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 SMBJ45AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ45AQ-13-F?
All SMBJ45AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AQ-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 SMBJ45AQ-13-F part is unused and in its original packaging.
Return procedure for SMBJ45AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AQ-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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