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Diodes Incorporated SMAJ12CAQ-13-F
- Part No.:
- SMAJ12CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CAQ-13-F.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:10,281
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Product details
Overview
SMAJ12CAQ-13-F from Diodes Incorporated is a bi-directional 400W automotive transient voltage suppressor (TVS) diode with 12V reverse standoff voltage, 19.9V max clamping voltage at 20.1A peak pulse current, and AEC-Q101 qualification. It protects CAN, LIN, and sensor interfaces in engine control units and body electronics against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ12CAQ-13-F datasheet, SMAJ12CAQ-13-F pinout, SMAJ12CAQ-13-F application, or SMAJ12CAQ-13-F equivalent, this device is selected for robust bidirectional surge suppression in 12V automotive power domains where clamping voltage margin, low leakage (<0.5µA @ 12V), and IATF 16949 traceability are critical.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, delivering 400W peak pulse power under 10×1000µs waveform per IEC 61000-4-5. Its glass-passivated junction ensures stable breakdown at 13.3–14.7V (min/max VBR) with 1.0mA test current and maintains <0.5µA reverse leakage at VRWM.
Designed for automotive-grade reliability, it sustains operation from –55°C to +175°C junction temperature, supports 40A non-repetitive forward surge (8.3ms half-sine), and achieves 19.9V clamping at 20.1A IPP - enabling protection of 12V supply rails without overvoltage stress on downstream ICs.
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 | 12V - blocks normal 12V system operation while triggering only during overvoltage events |
| Max Clamping Voltage | 19.9V @ 20.1A - limits transient voltage to safe level for 3.3V/5V logic and MCU I/O pins |
| Breakdown Voltage | 13.3–14.7V @ 1.0mA - tight VBR tolerance ensures consistent turn-on across temperature and lot |
| Reverse Leakage | <0.5µA @ 12V - negligible standby current impact on battery-sensitive modules like telematics |
| Operating Temperature | –55°C to +175°C - qualified for under-hood placement near engine control units and transmission controllers |
| AEC-Q101 Qualified | Yes - validated for automotive use with PPAP documentation and IATF 16949 manufacturing control |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing; cathode band omitted (bi-directional configuration); moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts during negative transients (e.g., ISO7637-2 Pulse 1, –100V), clamping to ≤19.9V |
| Cathode | Transient current entry (positive polarity) | Conducts during positive transients (e.g., ISO7637-2 Pulse 2a, +50V), clamping to ≤19.9V |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Protects AC-coupled lines (e.g., CAN H/L, LIN bus) without polarity dependency |
| Glass passivated die | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and automotive "Green" standards (<900ppm Br/Cl, <1000ppm Sb) |
| Low clamping ratio | VC/VRWM = 1.66 enables tighter voltage margin vs. 12V rail compared to generic 15V TVS |
| High surge current rating | 20.1A IPP supports repeated ISO10605 contact discharge (30kV) without parameter shift |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
|
Use Scenario: 12V battery feed to ECU main power regulator subjected to load dump and alternator ripple. IC Role / Device Role: Primary bidirectional clamp on input rail upstream of DC/DC converter. Use Value: Limits transients to ≤19.9V, preventing overvoltage shutdown or damage to 36V-rated input regulators. |
Use Scenario: CAN FD high-speed bus (5Mbps) exposed to ESD during connector mating/unmating. IC Role / Device Role: Line-side TVS between CAN controller and physical transceiver. Use Value: Adds <1pF parasitic capacitance and clamps ±30kV ISO10605 discharges without signal integrity degradation. |
| Body Control Module (BCM) Sensor Interface | Automotive Lighting Driver Input |
|
Use Scenario: Analog sensor inputs (e.g., ambient temperature, rain sensor) routed through harnesses prone to inductive switching noise. IC Role / Device Role: Localized protection at connector entry point before signal conditioning amplifier. Use Value: Sub-µA leakage preserves accuracy of µA-level sensor bias currents; 19.9V clamp avoids ADC saturation. |
Use Scenario: LED driver IC power input in headlamp module exposed to PWM-induced back-EMF from motorized shutters. IC Role / Device Role: Secondary surge limiter after primary fuse, before buck controller IC. Use Value: Withstands 40A IFSM surges from relay coil collapse, eliminating need for larger footprint alternatives. |
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 |
|---|---|---|---|
| SMAJ12A-13-F | Uni-directional; lacks negative-polarity clamping capability | Requires external polarity management (e.g., series diode) for full ISO7637-2 coverage | Select only if protecting DC-only rails with known polarity and no AC coupling |
| SMCJ12CA | Higher 1500W PPK rating but larger SMC (DO-214AB) package; 22.5V VC @ 26.7A | Overqualified for most 12V ECUs; requires PCB area increase and higher cost | Prefer when system-level testing reveals >400W surge energy or needs extended lifetime under repetitive stress |
Compared with SMAJ12A-13-F, the SMAJ12CAQ-13-F eliminates polarity dependency for CAN/LIN; versus SMCJ12CA, it delivers optimal size-to-power ratio for space-constrained 12V modules without sacrificing AEC-Q101 compliance or clamping performance.
Availability
SMAJ12CAQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN FD communication nodes, and body control modules requiring stable component supply with full automotive traceability and lifecycle support.
Supply support for SMAJ12CAQ-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 and manufacturing operations certified to IATF 16949 and AEC-Q101 standards.
The SMAJ series targets automotive electronics protection, engineered specifically to meet ISO7637-2 and ISO10605 requirements while maintaining RoHS 3 and halogen-free compliance in compact surface-mount packages.
FAQ
What does the 'C' suffix in SMAJ12CAQ-13-F indicate?
The 'C' denotes bi-directional functionality - meaning the device clamps transients of both polarities symmetrically, unlike uni-directional variants (e.g., SMAJ12AQ-13-F) that only protect against positive surges. This is essential for differential buses like CAN and LIN where voltage reversals occur during normal operation or fault conditions.
Is SMAJ12CAQ-13-F compatible with lead-free reflow processes?
Yes - it features matte tin lead-free plating, qualified per JEDEC J-STD-020 moisture sensitivity level 1, and is fully compatible with standard Pb-free reflow profiles (peak 260°C). The SMA package's thermal mass allows reliable solder joint formation without delamination or voiding under IPC-A-610 Class 3 requirements.
How does its clamping voltage compare to SMAJ12A-13-F?
SMAJ12CAQ-13-F has identical 19.9V max clamping voltage at 20.1A IPP as its uni-directional counterpart SMAJ12A-13-F. However, the bi-directional version achieves this clamping in both directions, whereas SMAJ12A-13-F only clamps positive transients and conducts negative surges as forward-biased diode (VF ≈ 3.5V), offering asymmetric protection.
Can this TVS be used in 24V commercial vehicle systems?
No - its 12V VRWM and 19.9V clamping are optimized for 12V automotive architectures. In 24V systems, sustained operating voltage exceeds VRWM, causing excessive leakage and thermal runaway. For 24V applications, select SMAJ24CAQ-13-F (24V VRWM, 38.9V VC) or higher-voltage variants from the same family.
SMAJ12CAQ-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- 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
SMAJ12CAQ-13-F FAQ
1.How can I place an order for SMAJ12CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CAQ-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 SMAJ12CAQ-13-F reliable?
The price and inventory of SMAJ12CAQ-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 SMAJ12CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ12CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CAQ-13-F?
SMAJ12CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CAQ-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 SMAJ12CAQ-13-F?
For technical support, including SMAJ12CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ12CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ12CAQ-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 SMAJ12CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ12CAQ-13-F?
All SMAJ12CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CAQ-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 SMAJ12CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ12CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12CAQ-13-F Tags
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ESD9B5.0ST5G
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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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