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Diodes Incorporated SMAJ11CA-13-F
- Part No.:
- SMAJ11CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CA-13-F.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:34,058
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Product details
Overview
SMAJ11CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 11V reverse standoff voltage (VRWM), 18.2V max clamping voltage at 22A peak pulse current, and fast response time under 1ps. Used in automotive infotainment power rails to suppress load dump and ISO 7637-2 transients.
For engineers reviewing the SMAJ11CA-13-F datasheet, SMAJ11CA-13-F pinout, SMAJ11CA-13-F application, or SMAJ11CA-13-F equivalent, key selection criteria include clamping ratio (VC/VRWM = 1.65), unidirectional vs. bidirectional polarity configuration, JEDEC-standard SMA package thermal performance, and compliance with AEC-Q101 for automotive-grade surge immunity.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<5µA at VRWM), while the 1.0W steady-state power rating supports continuous operation under minor leakage conditions.
The device responds to 8.3ms half-sine surges per IEC 61000-4-5, delivering 22A peak pulse current at 18.2V clamping. Derating above +25°C follows a defined curve-e.g., 75% power capability at +75°C ambient-enabling accurate thermal design in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single high-energy transients like ISO 7637-2 Pulse 5a without failure |
| Reverse Standoff Voltage | 11V - defines maximum continuous working voltage before significant leakage begins |
| Clamping Voltage | 18.2V @ 22A - limits downstream IC voltage during surge, critical for 12V automotive system compatibility |
| Breakdown Voltage | 12.2–13.5V @ 1mA - ensures reliable triggering margin above VRWM |
| Leakage Current | <5µA @ 11V - minimizes standby power loss in battery-powered systems |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMT footprint with 2.29–2.92mm body width and 4.00–4.60mm length |
Pinout & Package
Two-terminal SMA (DO-214AC) package with cathode band omitted for bidirectional configuration. Standard anode/cathode terminals are non-polarized; either terminal may serve as input or return path depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Transient current entry (positive surge) | Conducts during positive-going overvoltage events; tied to protected line |
| Cathode (Pin 2) | Transient current entry (negative surge) | Conducts during negative-going overvoltage events; tied to same protected line or ground reference |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against severe transients such as load dump (up to 120V/400ms) in 12V vehicle systems |
| Glass passivated die | Ensures stable VBR over temperature and lifetime, reducing parameter drift in harsh environments |
| AEC-Q101 qualified variant available | Supports automotive qualification pathways; standard SMAJ11CA-13-F shares identical die and process |
| RoHS 3 & Halogen-free | Meets EU environmental directives with <900ppm Br/Cl and <1000ppm Sb, suitable for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12V supply lines in telematics control units from ISO 7637-2 Pulse 1, 2a, 3a/b, and 5a transients. IC Role / Device Role: Primary clamping element placed between power input and DC-DC converter input stage. Use Value: Limits voltage excursion to ≤18.2V during 22A surge, preventing damage to downstream PMICs rated for 20V absolute max. | Use Scenario: Shielding RS-485 transceivers in factory automation PLC I/O modules from ESD and cable discharge events. IC Role / Device Role: Bidirectional shunt clamp across differential bus lines (A/B) referenced to common-mode ground. Use Value: Sub-1ps response captures fast ESD pulses (IEC 61000-4-2 ±8kV contact), holding differential swing within transceiver's ±12V common-mode range. |
| Consumer USB-C Port Protection | Telecom PoE Midspan Surge Guard |
Use Scenario: Safeguarding VBUS and CC lines in portable docking stations exposed to hot-plug induced transients and ESD. IC Role / Device Role: Dual placement-unidirectional on VBUS, bidirectional on CC-to handle asymmetric and symmetric threats. Use Value: 11V VRWM aligns with USB PD 3.0 VBUS regulation; 18.2V clamping avoids tripping 20V-rated port controllers during surge. | Use Scenario: Front-end protection of IEEE 802.3af/at midspan PSE outputs against lightning-induced surges on Ethernet cables. IC Role / Device Role: Paired bidirectional TVS devices on each powered pair (spare pairs or data pairs) before magnetics. Use Value: 400W rating handles 10/700µs telecom surge waveforms; SMA package allows dense layout near RJ45 connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-13-F | Unidirectional version; same VRWM, VBR, and VC, but conducts only for positive surges | Requires explicit polarity assignment; unsuitable for AC or floating lines | Select when protecting DC rails with known fixed polarity and ground-referenced return |
| SMBJ11CA-13-F | Same electrical specs but SMB (DO-214AA) package-4.6 × 3.6 mm vs. SMA's 4.3 × 2.6 mm; 600W rating | Larger footprint and higher surge capacity; better thermal dissipation at cost of board area | Choose when higher pulse energy handling (600W) or improved thermal margin is required in space-tolerant designs |
Compared with SMAJ11A-13-F, SMAJ11CA-13-F enables polarity-agnostic protection ideal for differential or AC-coupled paths; versus SMBJ11CA-13-F, it trades 200W lower pulse rating for 30% smaller PCB area-critical in space-constrained automotive ECUs.
Availability
SMAJ11CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial RS-485 nodes, USB-C docking stations, and PoE midspan injectors requiring stable component supply across production lifecycles.
Supply support for SMAJ11CA-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 the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability board-level surge protection in automotive, industrial, and communications equipment where compact size and repeatable clamping performance are essential.
FAQ
What does the 'C' suffix in SMAJ11CA-13-F indicate?
The 'C' denotes bidirectional configuration: the device clamps overvoltage transients of either polarity symmetrically across its two terminals. Unlike unidirectional variants (e.g., SMAJ11A-13-F), it has no cathode band marking and functions identically regardless of voltage polarity applied-ideal for AC signal lines or floating DC buses.
Can SMAJ11CA-13-F be used in place of a unidirectional TVS in a DC power rail?
Yes, but with design consideration: bidirectional operation means it will conduct during both positive and negative excursions relative to ground. In a grounded 12V rail, this provides redundant protection against reverse-battery faults-but increases leakage path risk if ground integrity is compromised. Verify system grounding architecture before substitution.
What is the maximum operating temperature for continuous use?
The junction temperature range is –55°C to +150°C, and steady-state power dissipation is rated at 1.0W at TL = +75°C. Derating is linear to zero at +150°C lead temperature. For continuous DC bias, ensure average power (VRWM × IR) remains below 100mW to avoid thermal runaway, given typical IR ≤ 5µA at 25°C.
Is SMAJ11CA-13-F compliant with automotive qualification standards?
The standard SMAJ11CA-13-F is not AEC-Q101 certified, but Diodes offers a functionally identical automotive-grade variant-SMAJ11CAQ-13-F-qualified to AEC-Q101, PPAP-capable, and manufactured in IATF 16949-certified facilities. Use the 'Q' suffix part for production automotive applications requiring formal qualification documentation.
SMAJ11CA-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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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
SMAJ11CA-13-F FAQ
1.How can I place an order for SMAJ11CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CA-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 SMAJ11CA-13-F reliable?
The price and inventory of SMAJ11CA-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 SMAJ11CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ11CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CA-13-F?
SMAJ11CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CA-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 SMAJ11CA-13-F?
For technical support, including SMAJ11CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CA-13-F requirements.
6.How does Aetrix verify that SMAJ11CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ11CA-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 SMAJ11CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ11CA-13-F?
All SMAJ11CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CA-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 SMAJ11CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ11CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11CA-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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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