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Vishay General Semiconductor - Diodes Division SMAJ11CAHE3_A/I
- Part No.:
- SMAJ11CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHE3_A/I.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
SMAJ11CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 11 V stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 18.2 V maximum clamping voltage (VC) at 22 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the SMAJ11CAHE3_A/I datasheet, SMAJ11CAHE3_A/I pinout, SMAJ11CAHE3_A/I application, or SMAJ11CAHE3_A/I equivalent, this device serves as a robust, RoHS-compliant, bidirectional transient suppressor with verified thermal resistance (RθJA = 120 °C/W), low leakage (<1 μA at VWM), and MSL Level 1 moisture sensitivity rating - critical for high-reliability PCB designs requiring surge immunity per IEC 61000-4-5.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports automated placement and meets UL 94 V-0 flammability requirements.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It sustains 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and operates across -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR min/max | 12.2 V / 13.5 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on under ESD or surge events. |
| VC @ IPPM | 18.2 V at 22 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy handling capability; determines survivability against lightning or inductive spikes. |
| ID @ VWM | <1 μA - Ultra-low reverse leakage; preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| RθJA | 120 °C/W - Thermal resistance to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, MSL Level 1 compliant, compatible with lead-free reflow (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical bidirectional terminals - either end conducts during overvoltage in either polarity; no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV) on 2 Ω source impedance without failure. |
| Glass passivated junction | Ensures long-term stability of VBR and low parameter drift over temperature and lifetime. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports standard SMT assembly processes. |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for enclosed industrial and automotive enclosures. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus or LIN transceiver signal lines from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching PHY IC. Use Value: Maintains signal integrity below 18.2 V clamping threshold while surviving 400 W surges - enabling compliance with ISO 16750-2. |
Use Scenario: Shielding 24 V digital input modules in programmable logic controllers from relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed across input terminals to limit voltage excursions during switching transients. Use Value: Low 1 μA leakage prevents false triggering; 150 °C max TJ supports operation inside sealed control cabinets. |
| Consumer Power Adapter Output | Telecom Line Interface |
Use Scenario: Safeguarding USB-C or DC barrel jack outputs against accidental AC mains coupling or hot-plug surges. IC Role / Device Role / Timing Role: Secondary-side transient suppressor between DC-DC output and connector, acting as last-line defense. Use Value: 11 V VWM aligns with 12 V nominal adapter rails; 18.2 V VC avoids overvoltage shutdown of connected devices. |
Use Scenario: Protecting Ethernet PHY or RS-485 transceivers from induced lightning surges on outdoor telecom wiring. IC Role / Device Role / Timing Role: Bidirectional TVS mounted at board edge, parallel to data pair, to clamp common-mode transients. Use Value: Symmetric clamping ensures equal protection on both signal polarities; UL 94 V-0 housing meets telecom safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CA-M3 | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in plating chemistry (HM3 vs HE3). | No functional difference in circuit performance; selected when halogen-free BOM compliance is mandated. | Choose SMAJ11CA-M3 if halogen-free materials are required; otherwise SMAJ11CAHE3_A/I offers identical protection with standard RoHS compliance. |
| SMBJ11CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher RθJA (90 °C/W) and 600 W PPPM rating. | Better thermal dissipation and surge margin; requires larger PCB footprint and different pad layout. | Choose SMBJ11CAHE3_A/I when higher surge endurance (600 W) or improved thermal performance is needed and board space allows. |
Compared with SMAJ11CAHE3_A/I, SMAJ11CA-M3 provides identical protection with halogen-free construction, while SMBJ11CAHE3_A/I trades compact size for greater power handling and lower thermal resistance - enabling selection based on BOM compliance or system-level surge margin requirements.
Availability
SMAJ11CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ11CAHE3_A/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where ESD, EFT, and surge immunity must meet ISO, IEC, and AEC standards.
FAQ
What is the clamping voltage of SMAJ11CAHE3_A/I at its rated peak pulse current?
The SMAJ11CAHE3_A/I has a maximum clamping voltage (VC) of 18.2 V at 22 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value ensures downstream components remain within safe operating voltage limits during transient events. The SMAJ11CAHE3_A/I's low VC relative to its 11 V stand-off voltage reflects strong clamping efficiency critical for protecting sensitive 12 V rail interfaces.
Is SMAJ11CAHE3_A/I suitable for automotive applications?
Yes, SMAJ11CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It supports operating temperatures from -55 °C to +150 °C and is validated for under-hood and chassis-mounted applications such as sensor signal protection and body control module I/O. The SMAJ11CAHE3_A/I meets stringent automotive reliability and solderability requirements including J-STD-020 MSL Level 1.
How does the bidirectional configuration of SMAJ11CAHE3_A/I affect its circuit implementation?
The SMAJ11CAHE3_A/I has no polarity marking and conducts identically in both directions, making it ideal for AC-coupled or differential signal lines like CAN, RS-485, or audio inputs. Unlike unidirectional TVS diodes, it eliminates orientation concerns during placement and provides symmetrical clamping without external biasing. This simplifies layout and ensures consistent protection regardless of transient polarity - a key advantage confirmed in the SMAJ11CAHE3_A/I datasheet's bidirectional electrical characteristics table.
What is the thermal resistance of SMAJ11CAHE3_A/I, and how does it impact PCB layout?
SMAJ11CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces effective RθJA. For sustained surge duty cycles or high ambient temperatures, designers should verify junction temperature using the SMAJ11CAHE3_A/I's 150 °C max TJ rating and derate power accordingly per Figure 2 in the Vishay datasheet.
Does SMAJ11CAHE3_A/I meet UL recognition requirements?
Yes, SMAJ11CAHE3_A/I carries Underwriters Laboratory Recognition under file E136766 for both unidirectional and bidirectional configurations, complying with UL 497B for signal line protectors. Its molding compound also meets UL 94 V-0 flammability rating - a requirement for enclosed industrial and automotive electronic assemblies. This UL recognition is explicitly cited in the Vishay document 88390 and applies to the SMAJ11CAHE3_A/I variant with HE3 suffix.
SMAJ11CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11CAHE3_A/I FAQ
1.How can I place an order for SMAJ11CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHE3_A/I 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 SMAJ11CAHE3_A/I reliable?
The price and inventory of SMAJ11CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHE3_A/I?
SMAJ11CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHE3_A/I 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 SMAJ11CAHE3_A/I?
For technical support, including SMAJ11CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ11CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHE3_A/I 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 SMAJ11CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHE3_A/I?
All SMAJ11CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHE3_A/I, 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 SMAJ11CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ11CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11CAHE3_A/I Tags
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