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Diodes Incorporated SMAJ40AQ-13-F
- Part No.:
- SMAJ40AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40AQ-13-F.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,985
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Product details
Overview
SMAJ40AQ-13-F from Diodes Incorporated is a unidirectional 400W surface-mount automotive transient voltage suppressor (TVS) diode with 40V reverse standoff voltage, 64.5V max clamping voltage at 6.2A 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 SMAJ40AQ-13-F datasheet, SMAJ40AQ-13-F pinout, SMAJ40AQ-13-F application, or SMAJ40AQ-13-F equivalent, this part supports high-reliability automotive power rail and signal line surge suppression where clamping voltage margin, IATF 16949 traceability, and 175°C junction operation are critical selection criteria.
Technical Context
This TVS diode operates as a unidirectional clamp in series with automotive power inputs or signal lines, activating when transient voltage exceeds 40V VRWM and limiting downstream voltage to ≤64.5V during 10/1000μs surges. Its glass-passivated silicon die ensures stable breakdown characteristics across -55°C to +175°C.
It delivers 400W non-repetitive peak pulse power per IEC 61000-4-5 waveform equivalents, with 40A IFSM surge capability and <0.5μA IR at VRWM - enabling low-leakage protection of CAN, LIN, and sensor supply rails without affecting quiescent current budgets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs transients up to 6.2A without failure |
| Reverse Standoff Voltage | 40V - blocks normal 12V/24V automotive system voltages while remaining inactive |
| Max Clamping Voltage | 64.5V @ IPP = 6.2A - limits transient overvoltage to safe levels for 48V-compatible ICs |
| Breakdown Voltage | 44.4–49.1V @ IT = 1.0mA - tight VBR tolerance ensures predictable turn-on threshold |
| Leakage Current | <0.5μA @ VRWM - negligible standby current impact on battery-sensitive modules |
| Junction Temp Range | -55°C to +175°C - qualified for engine control units, transmission controllers, and ADAS sensors |
Pinout & Package
Package: SMA (DO-214AC), surface-mount plastic package with cathode band polarity indicator; UL 94V-0 rated mold compound; 0.064g mass; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines clamping reference point |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery feed); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP documentation support and IATF 16949 manufacturing |
| Glass-passivated die | Stable VBR and low leakage over temperature and lifetime; immune to humidity-induced drift |
| Lead-free & green | RoHS 3 compliant; halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) |
| ISO7637-2 Pulse 1/2a/3a/3b compliant | Withstands -100V, +50V, -150V, +100V transients without degradation |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: 12V battery feed to microcontroller power supply in gasoline/diesel engine ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients before regulation. Use Value: Limits voltage to ≤64.5V during ISO7637-2 Pulse 1 (-100V), protecting 65V-rated input capacitors and LDOs. |
Use Scenario: High-speed CAN FD bus lines (CANH/CANL) in vehicle domain controllers subjected to ESD and coupled noise. IC Role / Device Role / Timing Role: Bidirectional TVS not applicable here; SMAJ40AQ-13-F used on VCC supply line feeding transceiver IC. Use Value: Prevents supply rail collapse during 30kV contact discharge (ISO10605), maintaining transceiver bias stability. |
| Body Control Module (BCM) LIN Bus | ADAS Camera Power Rail |
Use Scenario: 12V-to-5V buck converter input in BCM powering LIN transceivers and door lock actuators. IC Role / Device Role / Timing Role: TVS on primary side of DC-DC to absorb Pulse 2a (+50V) and Pulse 3b (+100V) spikes. Use Value: Maintains ≥40V standoff during normal operation while clamping fast transients within 1ns response time. |
Use Scenario: 12V input to imaging sensor module in front-facing camera systems operating near engine heat sources. IC Role / Device Role / Timing Role: Primary overvoltage protector on main power entry before PMIC sequencing. Use Value: Enables continuous operation at TJ = +175°C ambient, meeting ASIL-B thermal requirements for vision systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-13-F | No AEC-Q101 qualification; standard industrial grade; identical electrical specs | Not suitable for PPAP-controlled automotive production; acceptable for prototyping or non-safety modules | Select only if AEC-Q101 compliance and IATF 16949 traceability are not required |
| SMCJ40A-Q | Higher 1500W PPK rating; SMC (DO-214AB) package; same VRWM/VBR/VC | Better suited for higher-energy transients (e.g., heavy-duty truck load dump); larger footprint | Choose when surge energy exceeds 400W but PCB space allows SMC package |
Compared with SMAJ40A-13-F, the AQ suffix adds automotive qualification and change control; compared with SMCJ40A-Q, the SMAJ40AQ-13-F trades peak power for compact size and lower parasitic inductance - optimal for space-constrained, high-frequency transient environments like ADAS power domains.
Availability
SMAJ40AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera systems requiring stable component supply with full automotive traceability and long-term lifecycle support.
Supply support for SMAJ40AQ-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 with focus on automotive, industrial, and computing markets.
This device belongs to the SMAJ-AQ automotive TVS family, engineered specifically for ISO-compliant transient suppression in harsh-temperature vehicle subsystems where reliability and qualification rigor are mandatory.
FAQ
What is the difference between SMAJ40AQ-13-F and SMAJ40A-13-F?
The "AQ" suffix denotes AEC-Q101 qualification, PPAP capability, and manufacturing in IATF 16949 certified facilities - essential for automotive production. Electrically identical, SMAJ40A-13-F lacks automotive change control, traceability, and stress-test validation required for Tier 1 supply chains.
Can SMAJ40AQ-13-F be used on bidirectional signal lines like CAN or LIN?
No - SMAJ40AQ-13-F is unidirectional and must be used only on power rails or unidirectional signal paths referenced to ground. For CAN/LIN data lines, bi-directional variants (e.g., SMAJ40CAQ-13-F) or dedicated data-line TVS arrays are required to protect both positive and negative transients.
What is the maximum allowable ambient temperature for continuous operation?
At TA = +25°C, steady-state power dissipation is 1.0W. Derating follows Figure 6: at TA = +75°C, PM(AV) drops to 0.5W. Junction temperature must remain ≤+175°C - achievable with proper PCB copper area and airflow in engine bay applications.
Does this TVS require a series current-limiting resistor?
No - it is designed for direct connection across protected lines. A series resistor would degrade clamping speed and increase voltage overshoot. Layout best practice is short, wide traces to minimize inductance between TVS anode/cathode and protected node/ground plane.
SMAJ40AQ-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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
SMAJ40AQ-13-F FAQ
1.How can I place an order for SMAJ40AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40AQ-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 SMAJ40AQ-13-F reliable?
The price and inventory of SMAJ40AQ-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 SMAJ40AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ40AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40AQ-13-F?
SMAJ40AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40AQ-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 SMAJ40AQ-13-F?
For technical support, including SMAJ40AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40AQ-13-F requirements.
6.How does Aetrix verify that SMAJ40AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ40AQ-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 SMAJ40AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ40AQ-13-F?
All SMAJ40AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40AQ-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 SMAJ40AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ40AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40AQ-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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