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Diodes Incorporated SMBJ40AQ-13-F
- Part No.:
- SMBJ40AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AQ-13-F.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:14,954
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Product details
Overview
SMBJ40AQ-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for automotive power line protection. It features a 40V reverse standoff voltage (VRWM), 64.5V maximum clamping voltage (VC) at 9.3A peak pulse current (IPP), and AEC-Q101 qualification for under-hood applications including engine control units and body electronics.
For engineers reviewing the SMBJ40AQ-13-F datasheet, SMBJ40AQ-13-F pinout, SMBJ40AQ-13-F application, or SMBJ40AQ-13-F equivalent, this device is selected for ISO7637-2 Pulse 1/2a/3a/3b surge suppression and ISO10605 ESD protection in 12V/24V automotive systems where precise clamping, low leakage (<0.5µA), and IATF 16949 traceability are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds 44.4V (min VBR) and clamping to ≤64.5V within 10×1000μs waveform. Its 100A non-repetitive surge rating (IFSM) supports robust protection against load dump transients.
Designed for automotive environments, it maintains stable performance across –55°C to +175°C junction temperature range and complies with ISO7637-2 Pulse 1 (–150V), Pulse 2a (+112V), Pulse 3a (–220V), and Pulse 3b (+150V), with full PPAP capability and RoHS/halogen-free "Green" construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 40V - Maximum continuous reverse operating voltage before clamping begins; matches 12V/24V system nominal rails with margin. |
| VBR (min) | 44.4V - Breakdown voltage at 1mA test current; ensures reliable turn-on before downstream IC damage thresholds. |
| VC @ IPP | 64.5V at 9.3A - Clamped voltage during 10×1000μs surge; limits protected circuit stress below typical 65V automotive IC absolute max ratings. |
| PPK | 600W - Peak pulse power handling per single transient; sufficient for ISO7637-2 Pulse 1 and load dump events. |
| IR @ VRWM | <0.5µA - Reverse leakage at 40V; negligible power loss and signal integrity impact in always-on automotive modules. |
| TJ Range | –55°C to +175°C - Full automotive junction temperature range; validated for under-hood placement near engines or powertrain controllers. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic body with UL 94V-0 flammability rating, 0.1g mass, and matte tin lead finish compliant with MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines unidirectional conduction direction from cathode to anode during clamping. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); carries full transient current into anode during reverse-bias avalanche event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with HTOL, TC, UHAST, and ESD testing per AEC standard; enables direct integration into PPAP-controlled production. |
| ISO7637-2 & ISO10605 compliance | Meets Pulse 1 (–150V), Pulse 2a (+112V), Pulse 3a (–220V), Pulse 3b (+150V), and ±30kV ESD (air/contact) requirements without external filtering. |
| Lead-free & Halogen-free | RoHS 3 compliant with <900ppm Br, <900ppm Cl, <1000ppm Sb; satisfies automotive OEM green material mandates and end-of-life recycling requirements. |
| 600W peak pulse rating | Handles high-energy transients such as alternator load dump (up to 120V for 400ms) while maintaining clamping below 65V for downstream 65V-rated power management ICs. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
|
Use Scenario: Protects 12V supply rail of engine control units exposed to alternator load dump and ignition coil switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before regulation stage. Use Value: Limits transient voltage to ≤64.5V, preventing overvoltage failure of 65V-input buck controllers and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shields CAN transceiver power and signal lines in body control modules from ESD and battery disconnection spikes. IC Role / Device Role / Timing Role: Mounted on VCC line upstream of CAN transceiver to absorb ISO10605 ±30kV contact discharge energy before reaching PHY. Use Value: Sub-µA leakage preserves sleep-mode current budget; 600W rating handles combined ESD + ISO7637-2 Pulse 3b events without degradation. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
|
Use Scenario: Secures 12V input to image sensor SoCs and ISP power rails in forward-facing ADAS cameras mounted near windshield. IC Role / Device Role / Timing Role: Primary clamping device on main camera power rail, positioned after fuse but before LDO regulators. Use Value: 44.4V min breakdown ensures no false triggering during cold-crank dips; 175°C TJ rating sustains operation in sealed, thermally constrained enclosures. |
Use Scenario: Guards gate driver and microcontroller supply rails in EPS motor control units subject to high-current switching noise and load dump. IC Role / Device Role / Timing Role: Parallel-connected TVS on 12V logic supply feeding H-bridge drivers and MCU, providing fast-response overvoltage shutdown path. Use Value: 100A IFSM withstands repetitive 8.3ms half-sine surges from motor back-EMF; AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A-Q | Same electrical specs and AEC-Q101 qualification; differs only in packaging-bulk vs. tape-and-reel (–13-F). | No functional difference; bulk version used for prototyping or low-volume builds without automated placement. | Select SMBJ40A-Q for hand-soldering evaluation; SMBJ40AQ-13-F for SMT production with pick-and-place compatibility. |
| TPSMA6.8A-Q | Lower VRWM (6.8V), lower PPK (600W same), higher IR (5µA), same SMB package and AEC-Q101 rating. | Intended for 5V logic rail protection-not suitable for 12V/24V power line clamping due to premature conduction. | Not interchangeable: TPSMA6.8A-Q triggers at ~7.6V and would conduct continuously on 12V systems; use only for sub-10V signal lines. |
Compared with SMBJ40AQ-13-F, SMBJ40A-Q offers identical protection performance in non-automated assembly, while TPSMA6.8A-Q serves entirely different voltage domains and cannot replace it in power rail applications without risking thermal runaway or system malfunction.
Availability
SMBJ40AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply with full automotive traceability.
Supply support for SMBJ40AQ-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.
The SMBJ series is engineered specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive power networks, targeting ISO7637-2 and ISO10605 compliance without external circuitry.
FAQ
What is the polarity configuration of SMBJ40AQ-13-F?
SMBJ40AQ-13-F is a unidirectional TVS diode with cathode band marking on the package. It conducts only during reverse-bias overvoltage events-i.e., when cathode voltage exceeds anode voltage by ≥44.4V-and blocks forward current like a standard rectifier diode. This configuration prevents unintended conduction on positive-going transients in grounded-system architectures.
Does SMBJ40AQ-13-F require derating at elevated ambient temperatures?
Yes-its 600W peak pulse power is rated at TA = +25°C and derates linearly at 4.8W/°C above that temperature. At +85°C ambient, maximum PPK drops to approximately 312W. Steady-state power dissipation is limited to 5.0W at TL = +75°C, and thermal design must ensure PCB copper area and airflow maintain junction temperature ≤+175°C during surge events.
Can SMBJ40AQ-13-F be used in bi-directional surge protection applications?
No-SMBJ40AQ-13-F is unidirectional only. For bi-directional protection (e.g., data lines or floating supplies), Diodes offers the SMBJ40CAQ-13-F variant, which has symmetrical clamping in both polarities and no cathode band marking. Using the unidirectional part in bi-directional roles risks catastrophic failure during positive transients on the anode side.
How does SMBJ40AQ-13-F perform under repeated surge stress?
It is rated for non-repetitive pulses only: maximum 4 pulses per minute at 8.3ms half-sine waveform. Repeated surges exceeding this duty cycle cause cumulative junction heating and permanent parameter shift. For systems expecting frequent transients (e.g., start-stop vehicles), parallel staging or hybrid RC-TVS designs are recommended to distribute energy and preserve clamping accuracy over lifetime.
SMBJ40AQ-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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
SMBJ40AQ-13-F FAQ
1.How can I place an order for SMBJ40AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AQ-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 SMBJ40AQ-13-F reliable?
The price and inventory of SMBJ40AQ-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 SMBJ40AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ40AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AQ-13-F?
SMBJ40AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AQ-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 SMBJ40AQ-13-F?
For technical support, including SMBJ40AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AQ-13-F requirements.
6.How does Aetrix verify that SMBJ40AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ40AQ-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 SMBJ40AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ40AQ-13-F?
All SMBJ40AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AQ-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 SMBJ40AQ-13-F part is unused and in its original packaging.
Return procedure for SMBJ40AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AQ-13-F Tags
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