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Diodes Incorporated SMAJ12CA-13-F
- Part No.:
- SMAJ12CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CA-13-F.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:409,951
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Product details
Overview
SMAJ12CA-13-F from Diodes Incorporated is a bidirectional 400W transient voltage suppressor (TVS) diode in SMA package, designed for overvoltage protection of sensitive electronics against ESD, lightning, and inductive load switching transients. It features 12V reverse standoff voltage, 19.9V max clamping voltage at 20.1A peak pulse current, and operates from –55°C to +150°C - used in automotive power line protection and industrial I/O interface circuits.
For engineers reviewing the SMAJ12CA-13-F datasheet, SMAJ12CA-13-F pinout, SMAJ12CA-13-F application, or SMAJ12CA-13-F equivalent, key selection criteria include clamping voltage margin, peak pulse current capability, unidirectional vs. bidirectional polarity, thermal derating above +25°C, and compliance with AEC-Q101 for automotive-grade reliability.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, providing low-clamp protection without requiring polarity-aware PCB layout. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ns) to transients up to 400W (8.3 ms half-sine waveform).
It is rated for 1.0W steady-state power dissipation at lead temperature of +75°C and exhibits <5 µA reverse leakage at VRWM = 12V, enabling low-power standby compatibility in always-on systems such as CAN bus nodes and sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - withstands high-energy transients like ISO 7637-2 Pulse 1/2a/5a in automotive 12V systems |
| Reverse Standoff Voltage (VRWM) | 12V - defines maximum continuous operating voltage before clamping begins |
| Max Clamping Voltage (VC) | 19.9V @ IPP = 20.1A - limits protected circuit voltage during surge, preserving downstream ICs |
| Breakdown Voltage (VBR) | 13.3–14.7V @ IT = 1.0mA - ensures reliable turn-on with controlled tolerance band |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with standard reflow profiles and IPC-7351B land patterns |
Pinout & Package
The SMAJ12CA-13-F uses the standard SMA (DO-214AC) package: molded plastic case, UL 94V-0 rated, cathode band omitted due to bidirectional construction, and matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Transient conduction path | Both terminals function identically - no polarity sensitivity; connects across protected line and ground |
| Case | Mechanical mounting / thermal path | No electrical connection; provides minimal thermal resistance to PCB copper for power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against severe transients including ISO 16750-2 load dump surges in 12V vehicle systems |
| Glass-passivated die | Ensures stable VBR and low leakage over lifetime and temperature cycling, critical for long-term field reliability |
| Bidirectional configuration | Eliminates need for polarity-aware routing on differential or AC-coupled lines such as RS-485 or CAN FD buses |
| AEC-Q101 qualified variant available | Supports automotive qualification path via separate SMAJ12CAQ-13-F part number with PPAP documentation and IATF 16949 manufacturing |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and jump-start transients per ISO 7637-2. IC Role / Device Role: Primary clamping device placed between power rail and ground, upstream of DC-DC converters. Use Value: Limits voltage excursion to ≤19.9V during 20.1A surge, preventing damage to 24V-tolerant regulators and microcontrollers. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from ESD events on factory floor wiring. IC Role / Device Role: Low-capacitance (≈100 pF) shunt protector on signal line-to-ground path. Use Value: Sub-20V clamping preserves signal integrity of 0–5V ratiometric sensors while surviving ±15kV contact ESD per IEC 61000-4-2. |
| RS-485 Transceiver Port | Smart Meter Communication Module |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., MAX13487) connected to long outdoor cables. IC Role / Device Role: Bidirectional line-to-line and line-to-ground TVS on A/B differential pair. Use Value: Symmetric clamping prevents common-mode overvoltage from damaging transceiver input stages during lightning-induced surges. | Use Scenario: Securing PLC or RF communication ports in utility smart meters exposed to grid-switching transients. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), handling residual fast-rising energy. Use Value: Fast <1 ns response complements slower GDTs, ensuring full-spectrum surge suppression per IEC 61000-4-5 Level 3 (2 kV/1 kA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-13-F | Same electrical specs but SMB (DO-214AA) package - 2.5× larger footprint, higher thermal mass | Better suited for high-reliability industrial designs where board space allows and thermal margin is critical | Select when higher steady-state power handling (>1.5W) or legacy SMB footprint compatibility is required |
| 1.5SMC12CA | Same VRWM/VC but SMC (DO-214AB) package - 3.5× larger than SMA, 1500W peak rating | Used where surge energy exceeds 400W (e.g., telecom central office equipment) | Choose only if system-level testing confirms >400W transient threat level; otherwise over-engineered and cost-inefficient |
Compared with SMBJ12CA-13-F and 1.5SMC12CA, SMAJ12CA-13-F delivers optimal balance of compact size, automotive-grade thermal performance, and cost for space-constrained 12V systems - especially where AEC-Q101-compliant variants are needed.
Availability
SMAJ12CA-13-F is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface design, and RS-485 transceiver port hardening requiring stable component supply and traceable sourcing.
Supply support for SMAJ12CA-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications infrastructure applications.
FAQ
What does the "C" in SMAJ12CA-13-F signify?
The "C" suffix denotes a bidirectional configuration - meaning the device clamps transients of either polarity symmetrically across its two terminals. Unlike unidirectional versions (e.g., SMAJ12A), it has no cathode band and is ideal for AC-coupled or differential signal lines where polarity cannot be guaranteed.
Is SMAJ12CA-13-F compliant with automotive qualification standards?
SMAJ12CA-13-F itself is the standard industrial-grade version. However, Diodes offers an AEC-Q101-qualified variant under part number SMAJ12CAQ-13-F, manufactured in IATF 16949-certified facilities and supported with PPAP documentation for automotive production use.
How does the SMA package affect thermal performance compared to SMB or SMC?
The SMA package has lower thermal resistance than SMB or SMC due to smaller die attach area and shorter heat path, limiting steady-state power dissipation to 1.0W at TL = +75°C. Derating is required above ambient - e.g., only ~0.6W at +100°C ambient - making it best suited for intermittent surge duty rather than continuous power handling.
Can SMAJ12CA-13-F be used in parallel for higher surge current handling?
Parallel operation is not recommended due to mismatch in dynamic clamping characteristics - even small VBR tolerances (13.3–14.7V) cause current imbalance, leading to premature failure of one device. For higher current, select a single higher-rated part (e.g., SMBJ12CA) or verify matched binning with Diodes' application engineering team.
SMAJ12CA-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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ12CA-13-F FAQ
1.How can I place an order for SMAJ12CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CA-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 SMAJ12CA-13-F reliable?
The price and inventory of SMAJ12CA-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 SMAJ12CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ12CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CA-13-F?
SMAJ12CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CA-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 SMAJ12CA-13-F?
For technical support, including SMAJ12CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CA-13-F requirements.
6.How does Aetrix verify that SMAJ12CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ12CA-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 SMAJ12CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ12CA-13-F?
All SMAJ12CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CA-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 SMAJ12CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ12CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12CA-13-F Tags
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