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Diodes Incorporated SMAJ11CA-13
- Part No.:
- SMAJ11CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CA-13.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,195
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Product details
Overview
SMAJ11CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 11V reverse standoff voltage (VRWM), 12.2–13.5V breakdown voltage (VBR) at 1mA, 18.2V max clamping voltage (VC) at 22A peak pulse current, and operates from –55°C to +150°C - used in automotive infotainment power inputs and industrial PLC I/O protection.
For engineers reviewing the SMAJ11CA-13 datasheet, SMAJ11CA-13 pinout, SMAJ11CA-13 application, or SMAJ11CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, unidirectional/bi-directional polarity matching, peak pulse current handling under ISO 7637-2 Pulse 1/2a, and SMA package thermal dissipation in high-density PCB layouts.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with identical clamping behavior during positive and negative transients - critical for AC-coupled data lines and floating bus interfaces. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5µA at VRWM) over temperature and lifetime.
The device responds within <1ns to ESD and surge events, limiting voltage to ≤18.2V at 22A (8.3ms half-sine), and derates linearly above 25°C ambient per JEDEC-standard pulse derating curve. It is not intended for continuous forward conduction or regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (non-repetitive, 8.3ms half-sine); defines maximum single-event surge energy absorption capability |
| Reverse Standoff Voltage | 11V (VRWM); maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 12.2–13.5V at 1mA (VBR); onset of avalanche conduction - must exceed system operating voltage by ≥10% |
| Max Clamping Voltage | 18.2V at 22A IPP; worst-case voltage seen by downstream circuit during full-rated surge |
| Peak Pulse Current | 22.0A (IPP); maximum transient current the device safely clamps without failure |
| Junction Temp Range | –55°C to +150°C; supports under-hood automotive and industrial control cabinet deployments |
| Capacitance | ~100pF at 0V (typical); limits use in >10MHz high-speed data lines unless verified with layout parasitics |
Pinout & Package
Two-terminal SMA package (DO-214AC): anode and cathode terminals are symmetrical; bi-directional operation means no polarity marking - terminals are interchangeable. Case material is UL 94V-0 molded plastic; terminals are solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry point (negative surge) | Conducts during negative-going transients; tied to protected line or ground reference |
| Cathode (K) | Transient current entry point (positive surge) | Conducts during positive-going transients; tied to same node as anode in bi-directional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection on AC signals or floating buses without polarity concerns |
| Glass-passivated junction | Ensures repeatable VBR and low parametric drift over 10+ year field life |
| 400W peak pulse rating | Meets ISO 7637-2 Pulse 1 (–150V/2Ω) and Pulse 2a (+100V/2Ω) for 12V automotive systems |
| RoHS-compliant & lead-free | Matte tin finish; compliant with EU Directive 2011/65/EU Annex exemptions for high-temp solder |
| SMA surface-mount package | Enables automated placement and reflow; footprint compatible with industry-standard 2-pin TVS land patterns |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: 12V battery rail exposed to load dump (ISO 16750-2) and jump-start surges. IC Role / Device Role: Primary clamping element placed upstream of DC-DC converter input. Use Value: Limits voltage to ≤18.2V, protecting 24V-rated input stages while surviving 400W pulses. |
Use Scenario: RS-485 data lines routed alongside motor drives in factory automation cabinets. IC Role / Device Role: Bi-directional TVS on A/B differential pair, referenced to local ground. Use Value: Clamps ±15kV ESD (IEC 61000-4-2) and inductive kickback without distorting signal integrity. |
| Smart Meter AC Mains Interface | Medical Patient Monitor ECG Lead Input |
Use Scenario: Auxiliary 5V supply derived from rectified AC mains, subject to lightning-induced surges. IC Role / Device Role: Secondary overvoltage clamp after MOV-based front-end filtering. Use Value: Provides precise 18.2V clamping with fast response, preventing damage to isolated DC-DC controller. |
Use Scenario: High-impedance analog front-end capturing microvolt-level biopotentials. IC Role / Device Role: Low-capacitance (100pF) bi-directional clamp on differential ECG inputs. Use Value: Blocks >15kV ESD without adding noise or degrading common-mode rejection ratio (CMRR). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11CA-13 | Same VRWM/VBR/VC specs but 600W PPK rating in larger SMB package; 1.5× higher thermal mass | Better suited for repeated surge exposure (e.g., outdoor telecom) where board space allows SMB footprint | Select when surge repetition rate exceeds 4 pulses/minute or ambient exceeds 75°C |
| SMCJ11CA-13 | Same electrical specs, 1500W PPK rating in SMC package; 3× higher surge capacity than SMAJ | Required for ISO 7637-2 Pulse 5a (load dump) in 24V commercial vehicle systems | Choose only if design must survive ≥100V/10Ω load dump events - otherwise over-engineered and costly |
Compared with SMBJ11CA-13 and SMCJ11CA-13, SMAJ11CA-13 offers optimal cost, size, and 400W capability for consumer-grade and light-industrial applications where space is constrained and surge severity is moderate.
Availability
SMAJ11CA-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication interfaces, smart metering systems, and medical sensor front-ends requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ11CA-13 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
SMAJxxCA is part of Diodes' TVS Diode Portfolio targeting board-level surge and ESD protection - engineered for reliability in harsh environments including automotive, industrial, and infrastructure applications.
FAQ
Is SMAJ11CA-13 unidirectional or bi-directional?
SMAJ11CA-13 is bi-directional, indicated by the "C" suffix in the part number per Diodes' ordering convention. It provides symmetrical clamping for both positive- and negative-polarity transients without polarity-sensitive placement - unlike unidirectional SMAJ11A-13, which requires correct anode/cathode orientation relative to ground.
What is the maximum allowable PCB trace length between SMAJ11CA-13 and the protected IC?
For effective clamping, keep the total loop inductance below 10nH. With typical FR-4 PCB geometry, this limits combined trace length (from TVS anode to protected node + cathode to ground) to ≤15mm. Longer traces increase clamping voltage due to L·di/dt, potentially exceeding downstream IC absolute maximum ratings.
Can SMAJ11CA-13 be used in parallel to increase surge current handling?
No - paralleling TVS diodes causes current imbalance due to VBR mismatch (±1.3V tolerance), leading to premature failure of the lower-VBR unit. For higher IPP, select a single higher-rated device like SMBJ11CA-13 (600W) or SMCJ11CA-13 (1500W) instead.
Does SMAJ11CA-13 meet IEC 61000-4-5 (surge immunity) requirements?
SMAJ11CA-13 is rated for 400W (8.3ms half-sine), corresponding to ~1.2kV/2Ω or ~0.6kV/12Ω per IEC 61000-4-5 Level 3. To pass full system-level testing, it must be combined with upstream filtering (e.g., common-mode chokes, MOVs) and proper PCB layout - the device alone does not guarantee compliance.
SMAJ11CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ11CA-13 FAQ
1.How can I place an order for SMAJ11CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CA-13 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 reliable?
The price and inventory of SMAJ11CA-13 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 is usually 5 days.
3.What payment methods are accepted for SMAJ11CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CA-13?
SMAJ11CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CA-13 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?
For technical support, including SMAJ11CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CA-13 requirements.
6.How does Aetrix verify that SMAJ11CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ11CA-13 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 meets industry standards.
7.What is the process for return or replacement of SMAJ11CA-13?
All SMAJ11CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CA-13, 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 part is unused and in its original packaging.
Return procedure for SMAJ11CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11CA-13 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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D5V0H1B2LP-7B
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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DESD5V0U1BB-7
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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