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Diodes Incorporated SMAJ15CAQ-13-F
- Part No.:
- SMAJ15CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CAQ-13-F.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:30,635
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Product details
Overview
SMAJ15CAQ-13-F from Diodes Incorporated is a bi-directional 400W automotive transient voltage suppressor (TVS) diode with 15V reverse standoff voltage, 24.4V max clamping voltage at 16.4A peak pulse current, and AEC-Q101 qualification for under-hood and powertrain applications. It protects CAN/LIN bus lines and body control modules against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ15CAQ-13-F datasheet, SMAJ15CAQ-13-F pinout, SMAJ15CAQ-13-F application, or SMAJ15CAQ-13-F equivalent, this part supports automotive-grade surge immunity design requiring validated clamping performance, bi-directional polarity handling, RoHS/Green compliance, and IATF 16949 manufacturing traceability.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, delivering consistent 24.4V clamping under 10×1000μs waveform stress up to 400W peak power. Its glass-passivated die ensures stable breakdown behavior over -55°C to +175°C junction temperature range.
Designed for ISO7637-2 compliance, it withstands Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), and Pulse 3b (+100V) without degradation. The 1.0W steady-state power rating at TL = +75°C enables reliable operation in high-ambient engine bay environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surge without failure |
| Reverse Standoff Voltage | 15V - blocks normal operating voltage while remaining inactive |
| Max Clamping Voltage | 24.4V @ 16.4A - limits downstream IC voltage to safe level during surge |
| Breakdown Voltage | 16.7–18.5V @ 1mA - defines precise turn-on threshold for bi-directional conduction |
| Leakage Current | <0.5µA @ 15V - negligible standby power loss in always-on circuits |
| Operating Temperature | -55°C to +175°C - supports placement near engines, transmissions, and inverters |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic UL 94V-0 housing, 0.064g mass, cathode band omitted (bi-directional device).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (negative polarity) | Conducts during negative transients; symmetrical with Cathode |
| Cathode | Surge current entry (positive polarity) | Conducts during positive transients; symmetrical with Anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and IATF 16949 manufacturing |
| Bi-directional clamping | Identical 24.4V clamping for ±16.4A surges-no polarity sensitivity in layout |
| ISO10605 & ISO7637-2 compliant | Passes 30kV air/contact ESD and all four ISO7637-2 pulses without derating |
| Lead-free & Green | RoHS 3 compliant, halogen/antimony free (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| Automotive CAN Bus Protection | Body Control Module (BCM) Input Protection |
|---|---|
Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TJA1044GK) on 12V vehicle networks exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector interface to shunt surge energy before signal conditioning stage. Use Value: Maintains CAN signal integrity by limiting bus voltage to ≤24.4V during ISO7637-2 Pulse 3b (+100V), preventing transceiver latch-up or damage. |
Use Scenario: Safeguarding microcontroller GPIOs and LIN transceivers in door modules subjected to ESD from human contact per ISO10605. IC Role / Device Role / Timing Role: Primary front-end TVS on 12V supply rail and LIN data line, placed before local LDO regulators. Use Value: Absorbs 30kV contact discharge without leakage increase, preserving low-power sleep mode current budget in battery-sensitive systems. |
| Engine Control Unit (ECU) Sensor Inputs | Electric Power Steering (EPS) Motor Driver Interface |
Use Scenario: Shielding analog sensor inputs (e.g., MAP, TPS) connected to 5V MCU references against ignition noise and alternator ripple. IC Role / Device Role / Timing Role: Low-leakage (≤0.5µA) clamping device mounted adjacent to connector to minimize trace inductance. Use Value: Prevents false ADC readings during cranking transients by clamping spikes to 24.4V while drawing no measurable current at 5V nominal. |
Use Scenario: Protecting H-bridge gate drivers and current sense amplifiers in EPS motor control boards exposed to inductive kickback. IC Role / Device Role / Timing Role: Secondary-level TVS on 12V logic supply and PWM feedback paths, coordinated with primary bulk capacitance. Use Value: Limits voltage overshoot to 24.4V during 40A surge events, avoiding driver IC overvoltage shutdown and torque interruption. |
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 |
|---|---|---|---|
| SMAJ15CA | No AQ suffix - not AEC-Q101 qualified; standard commercial grade | Lacks PPAP documentation and IATF 16949 traceability; unsuitable for Tier-1 production | Select only for prototyping or non-automotive industrial use where qualification is not required |
| SMCJ15CAQ-13-F | Higher 1500W peak power; larger SMC package (7.11 × 6.22 mm vs. SMA 4.6 × 2.92 mm) | Better suited for high-energy battery line protection; excessive size for CAN/LIN space constraints | Choose when surge energy exceeds 400W or board layout allows SMC footprint |
Compared with SMAJ15CA (non-qualified) and SMCJ15CAQ-13-F (higher-power SMC), SMAJ15CAQ-13-F uniquely balances AEC-Q101 compliance, bi-directional 400W clamping, and compact SMA footprint-making it optimal for space-constrained, safety-critical automotive signal lines.
Availability
SMAJ15CAQ-13-F is available at Aetrix Electronics and suitable for automotive CAN bus protection, body control module input hardening, and engine control unit sensor interface applications requiring stable component supply across multi-year vehicle production cycles.
Supply support for SMAJ15CAQ-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 core expertise in protection devices, power management, and signal integrity products.
The SMAJ(AQ) series is engineered specifically for automotive electronics, delivering AEC-Q101-qualified transient suppression in compact surface-mount packages for ECU, ADAS, and infotainment subsystems.
FAQ
What does the "AQ" suffix signify in SMAJ15CAQ-13-F?
The "AQ" suffix denotes AEC-Q101 qualification, PPAP capability, and manufacture in IATF 16949-certified facilities. It confirms full automotive-grade reliability testing-including temperature cycling, humidity bias, and surge endurance-beyond standard commercial TVS diodes.
Is SMAJ15CAQ-13-F unidirectional or bidirectional, and how is polarity identified?
SMAJ15CAQ-13-F is bi-directional, indicated by the "C" in the part number. It has no cathode band marking-both terminals are functionally identical-and provides symmetrical clamping for positive and negative transients without orientation dependency during placement.
How does its 24.4V clamping voltage impact system-level protection design?
With a 24.4V clamping voltage at 16.4A, this TVS ensures downstream 24V-rated components (e.g., CAN transceivers, LIN buffers) remain within absolute maximum ratings during ISO7637-2 Pulse 3b (+100V). Its low dynamic impedance maintains clamping stability even under fast-rising transients.
Can SMAJ15CAQ-13-F replace SMAJ15A-13-F in an existing automotive design?
No-SMAJ15A-13-F is unidirectional and lacks AEC-Q101 qualification. Substituting requires PCB layout changes (removing cathode orientation constraint) and revalidation of PPAP documentation, ESD immunity, and thermal performance under bidirectional stress conditions.
SMAJ15CAQ-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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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
SMAJ15CAQ-13-F FAQ
1.How can I place an order for SMAJ15CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CAQ-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 SMAJ15CAQ-13-F reliable?
The price and inventory of SMAJ15CAQ-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 SMAJ15CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ15CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CAQ-13-F?
SMAJ15CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CAQ-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 SMAJ15CAQ-13-F?
For technical support, including SMAJ15CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ15CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ15CAQ-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 SMAJ15CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ15CAQ-13-F?
All SMAJ15CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CAQ-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 SMAJ15CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ15CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15CAQ-13-F Tags
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Diodes Incorporated
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