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Diodes Incorporated SMAJ43AQ-13-F
- Part No.:
- SMAJ43AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,204
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Product details
Overview
SMAJ43AQ-13-F from Diodes Incorporated is a unidirectional 400W surface-mount 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 and powertrain applications. It protects CAN bus interfaces, LIN transceivers, and engine control unit inputs against ISO7637-2 Pulse 1 (−100V), Pulse 2a (+50V), and ISO10605 ESD (±30kV).
For engineers reviewing the SMAJ43AQ-13-F datasheet, SMAJ43AQ-13-F pinout, SMAJ43AQ-13-F application, or SMAJ43AQ-13-F equivalent, this device serves as a primary front-end surge clamp in 12V/24V automotive subsystems where precise clamping, low leakage (<0.5µA @ 43V), and IATF 16949 traceable manufacturing are required.
Technical Context
This TVS diode employs glass-passivated silicon junction construction to deliver stable breakdown behavior across −55°C to +175°C junction temperature range. Its unidirectional polarity enables asymmetric surge suppression-blocking reverse surges while conducting forward overvoltage transients to ground.
The device conforms to ISO7637-2 Pulse 1 (inductive load dump), Pulse 2a (supply disconnection), and Pulse 3a/3b (switching noise) waveforms, with clamping validated per 10×1000µs standard test waveform. Steady-state power dissipation is rated at 1.0W at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000µs transients without failure in automotive load-dump events |
| Reverse Standoff Voltage (VRWM) | 43V - blocks normal 12V/24V system operation up to 43V before clamping activates |
| Max Clamping Voltage (VC) | 69.4V @ IPP = 5.7A - limits downstream IC voltage stress during ISO7637-2 Pulse 1 (−100V) |
| Breakdown Voltage (VBR) | 47.8–52.8V @ IT = 1.0mA - ensures reliable turn-on margin above VRWM for robust surge response |
| Reverse Leakage (IR) | <0.5µA @ 43V - prevents parasitic current draw in always-on vehicle modules |
| Operating Temperature | −55°C to +175°C - supports placement near engines, transmissions, and battery management units |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing; cathode band denotes unidirectional polarity; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path to ground | Connected to chassis or PCB ground plane to shunt transient energy away from protected IC |
| Cathode | Protected line input | Connected to signal/power line (e.g., CAN_H, LIN, 12V rail) requiring clamping protection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and IATF 16949 certified manufacturing |
| Glass-passivated die | Ensures stable VBR and low leakage over lifetime thermal cycling in under-hood environments |
| Lead-free & halogen-free | Meets RoHS 3 and "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb) |
| ISO10605 & ISO7637-2 compliant | Rated for ±30kV contact/air discharge and full 4-pulse ISO7637-2 immunity testing |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: 12V supply line to microcontroller-based ECU exposed to alternator load dump and ignition coil switching noise. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and DC-DC input, activated within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤69.4V, preventing damage to 75V-rated input capacitors and LDO regulators upstream of MCU. |
Use Scenario: High-speed CAN FD node in ADAS domain controller subjected to ESD events during connector mating/unmating. IC Role / Device Role / Timing Role: Line-side TVS on CAN_H/CAN_L differential pair, operating in parallel with common-mode choke. Use Value: Clamps ±30kV ESD strikes to <70V within 1ns, preserving signal integrity and avoiding bit errors during 5Mbps communication. |
| LIN Bus Node Protection | Body Control Module (BCM) Sensor Interface |
Use Scenario: LIN slave node (e.g., door module actuator) powered from vehicle battery with intermittent ground faults. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN bus line referenced to local ground, absorbing negative pulses from Pulse 3a (−150V). Use Value: Maintains LIN transceiver functionality by limiting bus voltage excursion to 69.4V, enabling recovery without reset. |
Use Scenario: Analog sensor interface (e.g., ambient temperature or humidity sensor) connected to BCM via long harness runs. IC Role / Device Role / Timing Role: Point-of-entry protection on sensor VDD line, placed immediately after connector to minimize inductance. Use Value: Prevents latch-up in 5V analog front-end ICs during ISO7637-2 Pulse 2a (+50V) induced on harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-13-F | No AEC-Q101 qualification; non-automotive grade; same electrical specs and package | Not suitable for PPAP-controlled production; limited to prototyping or non-safety-critical aftermarket designs | Select only if automotive qualification is not required and cost is prioritized over compliance documentation |
| SMCJ43A-Q | Higher 1500W peak power; DO-214AB (SMC) package; 1.5× larger footprint and 3× higher thermal mass | Better suited for high-energy load dump in 48V systems; incompatible with SMA-restricted board space | Choose when surge energy exceeds 400W capability or when board layout allows SMC footprint |
Compared with SMAJ43AQ-13-F, SMAJ43A-13-F lacks AEC-Q101 validation and traceability, while SMCJ43A-Q delivers higher surge capacity but requires redesign for larger SMC packaging-making SMAJ43AQ-13-F optimal for space-constrained, production-grade 12V/24V automotive nodes.
Availability
SMAJ43AQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN FD networks, and body control modules requiring stable component supply with full automotive qualification and traceable sourcing.
Supply support for SMAJ43AQ-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.
The SMAJ(AQ) series targets automotive electronics needing AEC-Q101-compliant transient protection, emphasizing reliability in harsh environments such as powertrain, chassis, and infotainment systems.
FAQ
What is the maximum clamping voltage of SMAJ43AQ-13-F under ISO7637-2 Pulse 1 conditions?
The maximum clamping voltage is 69.4V at 5.7A peak pulse current, measured per the 10×1000µs waveform defined in the datasheet. This value is guaranteed across −55°C to +175°C and ensures protected ICs see no more than 69.4V during worst-case load dump events.
Does SMAJ43AQ-13-F support bidirectional surge suppression?
No. SMAJ43AQ-13-F is unidirectional, indicated by the absence of "C" in its part number. It conducts only when cathode voltage exceeds anode by ≥47.8V. For bidirectional protection (e.g., data lines), SMAJ43CAQ-13-F must be used instead.
How does the SMA package affect thermal performance in continuous operation?
At TL = +75°C, the device dissipates 1.0W continuously. The SMA package's low thermal resistance (θJA ≈ 120°C/W typical) requires adequate copper pour and thermal vias to maintain junction temperature below +175°C during sustained surge duty cycles.
Is SMAJ43AQ-13-F compatible with lead-free reflow profiles?
Yes. It features matte tin lead-free plating, qualified per JEDEC J-STD-020 moisture sensitivity Level 1, and supports standard Pb-free reflow profiles up to 260°C peak temperature with ≤60 seconds above 217°C.
SMAJ43AQ-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):
- 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
SMAJ43AQ-13-F FAQ
1.How can I place an order for SMAJ43AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AQ-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 SMAJ43AQ-13-F reliable?
The price and inventory of SMAJ43AQ-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 SMAJ43AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ43AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AQ-13-F?
SMAJ43AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AQ-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 SMAJ43AQ-13-F?
For technical support, including SMAJ43AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AQ-13-F requirements.
6.How does Aetrix verify that SMAJ43AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ43AQ-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 SMAJ43AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ43AQ-13-F?
All SMAJ43AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AQ-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 SMAJ43AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ43AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43AQ-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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Diodes Incorporated
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