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Diodes Incorporated SMAJ24CAQ-13-F
- Part No.:
- SMAJ24CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAQ-13-F.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:17,040
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Product details
Overview
SMAJ24CAQ-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, 24V reverse standoff voltage (VRWM), and 38.9V max clamping voltage (VC) at 10.3A IPP. It protects CAN, LIN, and sensor interfaces in 12V/24V vehicle systems against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ24CAQ-13-F datasheet, SMAJ24CAQ-13-F pinout, SMAJ24CAQ-13-F application, or SMAJ24CAQ-13-F equivalent, this device is selected for AEC-Q101-compliant surge protection where clamping voltage margin, low leakage (<0.5µA @ VRWM), and IATF 16949 traceable sourcing are critical.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 26.7–29.5V (min/max) under 1.0mA test current. Its glass-passivated junction ensures stable clamping performance over -55°C to +175°C operating range.
Clamping response follows the standardized 10×1000µs waveform (per Figure 4), delivering 38.9V VC at 10.3A peak pulse current. It sustains 40A non-repetitive forward surge (IFSM) per 8.3ms half-sine wave, with thermal derating applied above TA = +25°C.
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 | 24V - blocks normal 12V/24V automotive bus voltages while remaining inactive |
| Max Clamping Voltage | 38.9V @ 10.3A - limits downstream IC voltage to safe level during 10×1000µs surge |
| Breakdown Voltage | 26.7–29.5V @ 1.0mA - defines precise turn-on threshold for bi-directional conduction |
| Leakage Current | <0.5µA @ 24V - negligible standby power loss in always-on vehicle modules |
| Operating Temperature | -55°C to +175°C - supports under-hood placement near engine control units |
Pinout & Package
Package: SMA (Surface-Mount Axial), molded plastic UL 94V-0, moisture sensitivity level 1, 0.064g weight. Cathode band omitted - bi-directional symmetry confirmed by "C" suffix and absence of polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge path | No polarity dependency - connects across protected line and ground (or between differential lines) |
| Case / Body | Thermal mass & mechanical anchor | Provides primary heat dissipation path to PCB copper; requires minimum 25mm² thermal pad for PM(AV) = 1.0W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified & PPAP capable | Validated for automotive production use with full change control and IATF 16949 manufacturing |
| Glass-passivated die construction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| Lead-free, halogen-free, RoHS 3 compliant | Meets automotive environmental requirements: <900ppm Br, <900ppm Cl, <1000ppm Sb |
| ISO10605 & ISO7637-2 certified | Tested to 30kV air/contact ESD and defined transients - no additional validation needed for Tier 1 compliance |
Applications
| Body Control Module (BCM) | CAN FD Transceiver Protection |
|---|---|
Use Scenario: Protecting LIN bus inputs in door module ECUs exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bi-directional TVS placed between LIN line and chassis ground to clamp bidirectional transients. Use Value: Maintains LIN signal integrity below 40V during ISO7637-2 Pulse 3b (+100V), preventing transceiver latch-up. |
Use Scenario: Safeguarding high-speed CAN FD physical layer against ESD and battery reversal events. IC Role / Device Role / Timing Role: Differential TVS across CANH/CANL lines, referenced to ground, enabling symmetrical clamping. Use Value: Limits common-mode surge energy before it reaches the transceiver's internal ESD diodes, extending lifetime beyond 100,000 mating cycles. |
| Engine Coolant Temperature Sensor | Automotive Camera Power Input |
Use Scenario: Shielding analog NTC sensor output from ignition coil coupling and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional configuration not used; bi-directional SMAJ24CAQ clamps both positive and negative spikes on 5V supply rail. Use Value: Prevents sensor offset drift caused by >20V transients, ensuring ±1°C accuracy over full temperature range. |
Use Scenario: Protecting 12V input of ADAS camera module against jump-start surges and load dump. IC Role / Device Role / Timing Role: TVS placed at connector entry point, shunting surge current directly to ground plane. Use Value: Absorbs 400W peak energy within 1000µs, avoiding LDO shutdown or image sensor reset during transient events. |
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 |
|---|---|---|---|
| SMAJ24A-Q | Uni-directional; cathode-banded; VF = 3.5V @ 35A (forward conduction only) | Requires correct polarity orientation; unsuitable for differential or AC-coupled lines | Select only when protecting unidirectional DC rails with known polarity and no reverse-voltage risk |
| TPSMD24C | Same VRWM/VC specs but DO-214AB package; higher IFSM (60A); 1.5x larger footprint | Lower thermal resistance enables higher sustained surge duty cycle in space-permitting designs | Prefer when board layout allows larger package and system requires >40A single-pulse robustness |
Compared with SMAJ24A-Q, SMAJ24CAQ-13-F eliminates polarity installation risk and supports differential signaling; versus TPSMD24C, it offers identical protection in a smaller SMA footprint but with lower IFSM rating - optimal for compact, cost-sensitive automotive modules.
Availability
SMAJ24CAQ-13-F is available at Aetrix Electronics and suitable for body control modules, CAN FD networks, engine sensor interfaces, and ADAS camera power inputs requiring stable component supply across automotive production lifecycles.
Supply support for SMAJ24CAQ-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets.
This device belongs to the SMAJ-AQ automotive TVS series, engineered specifically for AEC-Q101 compliance, ISO7637/ISO10605 immunity, and IATF 16949 production traceability in harsh-temperature vehicle environments.
FAQ
What does the "C" suffix in SMAJ24CAQ-13-F indicate?
The "C" denotes bi-directional functionality - meaning the device clamps transients equally in both polarities, with no cathode band marking and symmetric VBR min/max (26.7–29.5V). This differs from uni-directional variants (e.g., SMAJ24AQ) that conduct only in reverse bias and require correct orientation.
Can SMAJ24CAQ-13-F be used on a 5V logic line?
No - its 24V VRWM is mismatched for 5V systems. Using it would allow up to 24V before clamping, risking permanent damage to 5V ICs. For 5V applications, SMAJ5.0CAQ (5V VRWM, 9.2V VC) is the appropriate variant, maintaining safe margin below 5.5V absolute maximum ratings.
How is thermal performance affected by PCB layout?
Steady-state power dissipation is limited to 1.0W at TL = +75°C. Achieving this requires ≥25mm² of 2oz copper connected to both terminals via multiple thermal vias. Without adequate copper area, junction temperature exceeds +175°C during repeated surges, accelerating parametric shift and reducing reliability.
Is this part suitable for protecting USB-C or Ethernet PHYs?
No - SMAJ24CAQ-13-F has typical capacitance >200pF (not specified in datasheet but inherent to 400W TVS geometry), which would distort high-speed signals. For USB-C (480Mbps+) or Ethernet (100BASE-TX), low-capacitance TVS arrays like D3V3Z5U-03-7 or SP3052-01UTG are required to maintain signal integrity.
SMAJ24CAQ-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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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
SMAJ24CAQ-13-F FAQ
1.How can I place an order for SMAJ24CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAQ-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 SMAJ24CAQ-13-F reliable?
The price and inventory of SMAJ24CAQ-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 SMAJ24CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ24CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAQ-13-F?
SMAJ24CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAQ-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 SMAJ24CAQ-13-F?
For technical support, including SMAJ24CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ24CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAQ-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 SMAJ24CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ24CAQ-13-F?
All SMAJ24CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAQ-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 SMAJ24CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ24CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24CAQ-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
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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