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Diodes Incorporated SMAJ40CAQ-13-F
- Part No.:
- SMAJ40CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAQ-13-F.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,790
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Product details
Overview
SMAJ40CAQ-13-F from Diodes Incorporated is a bi-directional automotive-grade transient voltage suppressor (TVS) diode in SMA package, rated for 400W peak pulse power, 40V reverse standoff voltage (VRWM), and 64.5V max clamping voltage (VC) at 6.2A peak pulse current. 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 SMAJ40CAQ-13-F datasheet, SMAJ40CAQ-13-F pinout, SMAJ40CAQ-13-F application, or SMAJ40CAQ-13-F equivalent, this device delivers AEC-Q101 qualified surge immunity with verified clamping performance, bi-directional polarity, and IATF 16949-certified manufacturing - critical for automotive power rail and data line protection design.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) of 44.4–49.1V at 1.0mA test current and <0.5µA reverse leakage at VRWM. Its glass-passivated die ensures stable avalanche response under repetitive 10×1000µs transients per ISO7637-2.
Designed for automotive environments, it sustains -55°C to +175°C junction temperature, supports 8.3ms half-sine surge rating up to 40A, and maintains clamping integrity under ISO10605 30kV air/contact discharge - validated via AEC-Q101 stress testing including HTRB, HTGB, and TCT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - withstands ISO7637-2 Pulse 1 (-100V) and Pulse 3a (-150V) without failure |
| Reverse Standoff Voltage (VRWM) | 40V - sets minimum operating voltage threshold before clamping activates on either polarity |
| Max Clamping Voltage (VC) | 64.5V @ IPP = 6.2A - limits downstream IC voltage during 10×1000µs transient to safe level |
| Breakdown Voltage (VBR) | 44.4–49.1V @ IT = 1.0mA - defines precise avalanche onset for predictable protection timing |
| Peak Pulse Current (IPP) | 6.2A - maximum surge current handled at rated clamping voltage under standard waveform |
| Operating Temperature | -55°C to +175°C - enables placement near high-temperature engine compartments or power modules |
Pinout & Package
Package: SMA (Surface-Mount Axial), molded plastic UL 94V-0, moisture sensitivity level 1, 0.064g weight. Cathode band absent - bi-directional symmetry confirmed per datasheet marking diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | No polarity dependency - connects across protected line and ground (or between differential lines) without orientation concern |
| Case / Body | Thermal and mechanical interface | Provides primary heat dissipation path to PCB copper; requires ≥25mm² thermal pad for PM(AV) derating compliance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use with HTRB, HTGB, TCT, and ESD testing per JESD47 |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime, even under thermal cycling and humidity exposure |
| Bi-directional architecture | Protects AC-coupled or differential signals (e.g., CAN_H/CAN_L) without external polarity management |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); Br+Cl <1500ppm, Sb <1000ppm - meets automotive green material requirements |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Data Lines |
|---|---|
Use Scenario: 12V battery feed to microcontroller power supply subjected to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VDD rail, responding within nanoseconds to transients exceeding 40V. Use Value: Limits voltage to ≤64.5V during ISO7637-2 Pulse 1 (-100V), preventing LDO or MCU damage while maintaining system uptime. |
Use Scenario: Protection of CAN_H and CAN_L lines against ESD events and coupled transients in vehicle networking. IC Role / Device Role / Timing Role: Bi-directional shunt element placed differentially across bus pair, clamping common-mode surges. Use Value: Maintains signal integrity by clamping ±30kV ISO10605 discharges without latch-up or parameter shift - validated per AEC-Q101. |
| Body Control Module (BCM) Sensor Inputs | LIN Bus Communication Interface |
Use Scenario: Analog sensor inputs (e.g., temperature, pressure) exposed to harness-induced transients in door modules or lighting systems. IC Role / Device Role / Timing Role: Low-capacitance (<50pF typical) shunt protector placed at connector entry point. Use Value: Prevents false triggering or ADC saturation during ISO7637-2 Pulse 3b (+100V) while adding negligible signal distortion. |
Use Scenario: LIN transceiver I/O pins connected to long wiring harnesses susceptible to electrostatic discharge. IC Role / Device Role / Timing Role: Fast-response bi-directional clamp integrated adjacent to transceiver pins. Use Value: Enables robust 19.2kbps communication by limiting transient overshoot to ≤64.5V - preserving bit error rate below 10⁻⁹. |
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 |
|---|---|---|---|
| SMAJ40A-13-F | Uni-directional; cathode-banded; VF = 3.5V @ 35A forward surge | Requires correct polarity alignment; unsuitable for differential or AC-coupled lines | Select only when protecting unidirectional DC rails with known polarity and no need for symmetrical clamping |
| SMBJ40CA | Same VRWM/VC specs but SMB package (higher PM(AV) = 1.5W vs. 1.0W; larger footprint) | Offers better thermal margin in high-ambient zones but consumes 30% more PCB area | Prefer when board layout allows SMB and junction temperature exceeds 125°C under sustained surge duty |
Compared with SMAJ40A-13-F and SMBJ40CA, SMAJ40CAQ-13-F uniquely combines bi-directional operation, AEC-Q101 qualification, and SMA footprint - making it optimal for space-constrained, polarity-agnostic automotive data lines where PPAP documentation and IATF 16949 traceability are mandatory.
Availability
SMAJ40CAQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN/LIN bus interfaces, and body electronics requiring stable component supply with full automotive change control and PPAP documentation support.
Supply support for SMAJ40CAQ-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 design, manufacturing, and test facilities certified to IATF 16949 and ISO 9001 standards.
The SMAJ series is engineered specifically for automotive transient suppression - delivering AEC-Q101 reliability, ISO7637-2/ISO10605 compliance, and optimized clamping in compact surface-mount packages for power and data line protection.
FAQ
What does the 'C' suffix in SMAJ40CAQ-13-F signify?
The 'C' denotes bi-directional configuration - meaning the device clamps transients equally in both polarities without cathode band marking. This is confirmed in Diodes' datasheet DS40739 Rev. 17–2, Note 9, and distinguishes it from uni-directional variants like SMAJ40AQ-13-F which require correct anode/cathode orientation.
Is SMAJ40CAQ-13-F suitable for protecting a 5V logic interface?
No - its 40V VRWM and 64.5V clamping voltage exceed safe limits for 5V systems. It is designed for 12V/24V automotive rails and data buses (e.g., CAN, LIN). For 5V logic, select a lower-voltage TVS such as SMAJ5.0CAQ-13-F (VRWM = 5.0V, VC = 9.2V).
How does the 'AQ' suffix relate to automotive qualification?
The 'AQ' suffix indicates AEC-Q101 qualification, PPAP capability, and manufacture in IATF 16949-certified facilities - explicitly stated in the datasheet Product Summary section. This is distinct from commercial-grade 'A' or 'E' suffixes and confirms full automotive change control and reliability testing.
What is the maximum steady-state power dissipation at 75°C lead temperature?
PM(AV) is 1.0W at TL = +75°C, as specified in the Maximum Ratings table (DS40739 p.2). Derating begins above 75°C per Figure 6 - at 125°C TL, PM(AV) drops to ~0.5W. This value assumes proper PCB thermal relief and is not ambient-temperature rated.
SMAJ40CAQ-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:
- -
- Bidirectional Channels:
- 1
- 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
SMAJ40CAQ-13-F FAQ
1.How can I place an order for SMAJ40CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAQ-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 SMAJ40CAQ-13-F reliable?
The price and inventory of SMAJ40CAQ-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 SMAJ40CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ40CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAQ-13-F?
SMAJ40CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAQ-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 SMAJ40CAQ-13-F?
For technical support, including SMAJ40CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ40CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAQ-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 SMAJ40CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ40CAQ-13-F?
All SMAJ40CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAQ-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 SMAJ40CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ40CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CAQ-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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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Diodes Incorporated
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