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Diodes Incorporated SMAJ43CAQ-13-F
- Part No.:
- SMAJ43CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SMAJ43CAQ-13-F from Diodes Incorporated is a bi-directional 400W automotive transient voltage suppressor (TVS) diode with 43V reverse standoff voltage, 69.4V max clamping voltage at 5.7A peak pulse current, and AEC-Q101 qualification for under-hood power line protection in ISO7637-2 Pulse 1/2a/3a/3b and ISO10605 ESD environments.
For engineers reviewing the SMAJ43CAQ-13-F datasheet, SMAJ43CAQ-13-F pinout, SMAJ43CAQ-13-F application, or SMAJ43CAQ-13-F equivalent, this device is selected for robust surge immunity in 12V/24V automotive ECUs, infotainment power rails, and CAN/LIN bus interface protection where bidirectional clamping and IATF 16949 traceability are required.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, clamping transients up to ±69.4V at 5.7A (10×1000μs waveform), with <0.5μA reverse leakage at 43V VRWM and 47.8–52.8V breakdown range at 1mA test current. Its glass-passivated die ensures stable parametric performance over -55°C to +175°C junction temperature.
Designed for single-pulse surge suppression-not repetitive AC line protection-it delivers 400W peak pulse power with derating above +25°C ambient, and complies with ISO7637-2 Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), and Pulse 3b (+100V) waveforms in automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges without failure in automotive load dump scenarios |
| Reverse Standoff Voltage (VRWM) | 43V - blocks normal 12V/24V system operating voltages while remaining inactive |
| Max Clamping Voltage (VC) | 69.4V @ IPP = 5.7A - limits downstream IC voltage stress during ISO7637-2 Pulse 1/3a events |
| Breakdown Voltage (VBR) | 47.8–52.8V @ IT = 1mA - defines precise turn-on threshold for bidirectional transient response |
| Peak Pulse Current (IPP) | 5.7A - quantifies maximum surge current handled before clamping exceeds safe limits |
| Operating Temperature | -55°C to +175°C - supports placement near engines, transmissions, and power electronics |
Pinout & Package
Package: SMA (Surface-Mount Axial), molded plastic UL 94V-0, 0.064g weight, cathode band omitted (bi-directional device).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts during negative-going surges; symmetrical with cathode for bidirectional operation |
| Cathode | Transient current entry (positive polarity) | Conducts during positive-going surges; identical electrical behavior to anode terminal |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal/power lines without polarity constraints |
| AEC-Q101 qualification | Validated reliability for automotive under-hood applications including thermal cycling and humidity testing |
| Glass-passivated die | Ensures stable VBR and low leakage across temperature and lifetime, critical for long-term ECU deployment |
| Lead-free & halogen-free | Meets RoHS 3 and automotive green standards (<900ppm Br/Cl, <1000ppm Sb) for global vehicle compliance |
Applications
| Engine Control Unit (ECU) Power Input | Infotainment System 12V Rail |
|---|---|
Use Scenario: Protection against load dump (ISO7637-2 Pulse 1, -100V) and alternator ripple on main ECU supply. IC Role / Device Role / Timing Role: Primary bidirectional clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits input voltage to ≤69.4V during 100V transients, preventing latch-up or permanent damage to 5V/3.3V logic supplies. |
Use Scenario: Surge suppression on fused 12V feed to head unit power management ICs and display drivers. IC Role / Device Role / Timing Role: First-line transient shunt between battery rail and system ground, responding within nanoseconds. Use Value: Absorbs 400W pulses without degradation, maintaining stable 12V operation during ignition switching and jump-start events. |
| CAN Bus Physical Layer | Body Control Module (BCM) Inputs |
Use Scenario: ESD and coupled noise suppression on CAN_H/CAN_L differential pair in gateway modules. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp referenced to common-mode voltage, not ground. Use Value: Clamps ±30kV contact discharge (ISO10605) without distorting 1Mbps CAN signaling integrity. |
Use Scenario: Protection of wake-up inputs, sensor feeds, and switch matrix lines exposed to chassis transients. IC Role / Device Role / Timing Role: Localized TVS at connector entry point, minimizing PCB trace inductance impact. Use Value: Withstands repeated ISO7637-2 Pulse 3b (+100V) events on 5V logic inputs without parameter shift. |
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 |
|---|---|---|---|
| SMAJ43CA | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and PPAP documentation | Not suitable for production automotive programs requiring IATF 16949 traceability | Select only for prototyping or non-automotive industrial use where qualification is not mandated |
| SMBJ43CAQ-13-F | Same AEC-Q101 rating and bi-directional clamping, but SMB package (higher PM(AV) = 1.5W, larger footprint) | Better thermal dissipation in high-ambient zones; requires PCB redesign due to 5.29mm × 4.60mm vs. SMA's 4.60mm × 2.92mm | Choose when sustained surge duty cycle exceeds SMA thermal limits or board layout allows larger footprint |
Compared with SMAJ43CAQ-13-F, SMAJ43CA offers identical clamping but no automotive change control, while SMBJ43CAQ-13-F trades compactness for higher steady-state power handling-making the SMA variant optimal for space-constrained ECU designs requiring full automotive compliance.
Availability
SMAJ43CAQ-13-F is available at Aetrix Electronics and suitable for engine control units, infotainment power rails, and CAN physical layer protection requiring stable component supply across automotive production lifecycles.
Supply support for SMAJ43CAQ-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 for automotive, industrial, and consumer markets.
This device belongs to the SMAJ(AQ) automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature vehicle subsystems with zero-defect manufacturing requirements.
FAQ
What does the "C" suffix in SMAJ43CAQ-13-F indicate?
The "C" denotes bi-directional configuration: both terminals behave identically under positive and negative transients, enabling symmetric clamping without polarity orientation concerns. This differs from uni-directional variants (e.g., SMAJ43AQ-13-F) that require correct anode/cathode placement relative to ground.
Is SMAJ43CAQ-13-F suitable for protecting 24V commercial vehicle systems?
Yes-its 43V VRWM and 69.4V clamping voltage provide margin above nominal 24V (typically 27–28V max during charging), and it meets ISO7637-2 Pulse 1 (-100V) and Pulse 2a (+50V) requirements applicable to 24V truck/bus ECUs per SAE J1113-11.
How does the SMA package affect thermal performance in continuous operation?
The SMA package delivers 1.0W steady-state power dissipation at TL = +75°C. In PCB layouts with minimal copper area, junction temperature rise exceeds limits under sustained >100mA leakage; designers must use thermal vias and ≥1cm² 2oz copper pads to maintain TJ ≤ +175°C per AEC-Q101 requirements.
Can SMAJ43CAQ-13-F replace SMAJ40CAQ-13-F in existing designs?
Only after validation: 43V VRWM raises the turn-on threshold by 3V versus 40V, delaying clamping onset. This may allow higher transient voltages to reach downstream ICs. Verify system-level immunity with ISO7637-2 Pulse 1 (-100V) testing before substitution.
SMAJ43CAQ-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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
SMAJ43CAQ-13-F FAQ
1.How can I place an order for SMAJ43CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAQ-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 SMAJ43CAQ-13-F reliable?
The price and inventory of SMAJ43CAQ-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 SMAJ43CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ43CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAQ-13-F?
SMAJ43CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAQ-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 SMAJ43CAQ-13-F?
For technical support, including SMAJ43CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ43CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAQ-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 SMAJ43CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ43CAQ-13-F?
All SMAJ43CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAQ-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 SMAJ43CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ43CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43CAQ-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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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