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Vishay General Semiconductor - Diodes Division SMAJ11CAHE3/61
- Part No.:
- SMAJ11CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHE3/61.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,614
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Product details
Overview
SMAJ11CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ11CAHE3/61 datasheet, SMAJ11CAHE3/61 pinout, SMAJ11CAHE3/61 application, or SMAJ11CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling suppression of positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for protecting sensitive analog and digital inputs against ESD and inductive switching spikes.
The SMAJ11CAHE3/61 delivers 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 is rated for operating junction temperatures from –55 °C to +150 °C and meets UL 497B recognition for surge protectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 11 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 12.2–13.5 V at 1 mA - Voltage at which avalanche conduction begins; tight tolerance enables precise overvoltage protection. |
| VC (Clamping Voltage) | 18.2 V at IPPM = 22 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity with standard 10/1000 μs waveform; defines robustness against repetitive transients. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby current draw; preserves signal integrity and battery life in always-on circuits. |
| TJ Range | –55 °C to +150 °C - Wide operational temperature window supporting under-hood automotive and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional configuration | No marking on device; symmetric terminals enable orientation-agnostic PCB layout for bidirectional protection. |
| Cathode | Current exit terminal in forward bias; common node in bidirectional configuration | No band or marking - distinguishes it from unidirectional variants (e.g., SMAJ11A); eliminates polarity assembly errors. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485, sensor bridges) without external polarity management. |
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS sensors, ensuring long-term reliability under thermal cycling and vibration stress. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted on 5 mm × 5 mm copper pads - reduces need for additional series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transient events, preserving margin for 3.3 V or 5 V logic-level interfaces downstream of the TVS. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile usage without baking - simplifies manufacturing and reduces production risk. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) and LIN bus interfaces in vehicle cabin sensors against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching precision DACs or microcontroller ADC inputs. Use Value: Maintains signal fidelity under ±100 V/50 ms load dump events while adding <1 pF junction capacitance - avoids bandwidth degradation in 10 kHz sensor signals. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 24 V DC input channels, coordinated with series resistors to limit let-through energy to <10 mJ. Use Value: Clamps 1 kV/0.5 A surge to ≤18.2 V within nanoseconds, preventing latch-up in optocoupler input stages and extending module service life. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in set-top boxes and smart displays, complementing integrated port controller protection. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp located between connector and USB transceiver, sized to handle IEC 61000-4-2 ±15 kV contact discharge. Use Value: Adds <0.5 V clamping overhead vs. VBUS level while maintaining <0.5 pF parasitic capacitance - preserves signal rise/fall times and eye diagram integrity. |
Use Scenario: Overvoltage protection on POTS (Plain Old Telephone Service) line interface cards in VoIP gateways subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge arrestor on tip/ring pair, paired with gas discharge tube (GDT) for coarse filtering and current sharing. Use Value: Handles 10/1000 μs surges up to 22 A peak while limiting let-through voltage to ≤18.2 V - prevents damage to SLIC (Subscriber Line Interface Circuit) and codec ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | Preferred for environmentally regulated industrial equipment where halogen-free compliance is mandated. | Select SMAJ11CA-M3/61 when halogen-free material content is required; otherwise SMAJ11CAHE3/61 offers same performance with broader automotive acceptance. |
| SMBJ11CAHE3/61 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 29 % larger footprint and 10 % higher RθJA (133 °C/W). | Better suited for high-power or thermally constrained layouts where SMB pad area allows improved heat spreading. | Choose SMBJ11CAHE3/61 only if board space permits larger package and thermal design requires lower power density; SMAJ11CAHE3/61 remains optimal for dense SMT layouts. |
Compared with SMAJ11CA-M3/61, the SMAJ11CAHE3/61 offers identical protection performance with standard RoHS compliance, while SMBJ11CAHE3/61 trades compactness for marginally better surge current handling at the cost of PCB area - making SMAJ11CAHE3/61 the balanced choice for space-constrained automotive and industrial designs.
Availability
SMAJ11CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface protection requiring stable component supply, AEC-Q101 validation, and consistent surge immunity across production batches.
Supply support for SMAJ11CAHE3/61 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated without compromising signal integrity or board space.
FAQ
What is the clamping voltage of SMAJ11CAHE3/61 at its rated peak pulse current?
The SMAJ11CAHE3/61 has a maximum clamping voltage (VC) of 18.2 V at 22 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ11CAHE3/61 maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is SMAJ11CAHE3/61 suitable for automotive applications?
Yes, SMAJ11CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It undergoes stress testing including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress test (UHAST) to ensure reliability in under-hood and cabin environments. The SMAJ11CAHE3/61 is commonly deployed in engine control modules, body electronics, and ADAS sensor interfaces where transient immunity is mission-critical.
How does the bidirectional configuration of SMAJ11CAHE3/61 affect PCB layout?
The SMAJ11CAHE3/61 has no polarity marking (no cathode band), reflecting its symmetrical bidirectional structure - allowing either terminal to connect to line or return without functional impact. This eliminates orientation-dependent placement errors during automated assembly and simplifies routing for differential or AC-coupled signals like CAN, RS-485, or audio lines. The SMAJ11CAHE3/61's DO-214AC package supports standard pick-and-place tooling and reflow profiles per J-STD-020 MSL Level 1.
What is the maximum reverse leakage current for SMAJ11CAHE3/61 at its stand-off voltage?
The SMAJ11CAHE3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 11 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss and signal distortion in high-impedance circuits such as sensor bias networks or precision reference paths. Leakage remains below 5 μA up to +125 °C, supporting stable operation in thermally demanding applications.
Can SMAJ11CAHE3/61 replace unidirectional TVS diodes like SMAJ11AHE3/61?
No - SMAJ11CAHE3/61 is strictly bidirectional and cannot substitute for unidirectional types like SMAJ11AHE3/61 in DC-biased circuits where forward conduction must be blocked in one direction. Attempting replacement risks unintended forward conduction during normal operation. The SMAJ11CAHE3/61 is intended for AC, floating, or dual-rail signal paths; use SMAJ11AHE3/61 only where polarity-aware clamping is required, such as on DC power rails with defined ground reference.
SMAJ11CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ11CAHE3/61 FAQ
1.How can I place an order for SMAJ11CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHE3/61 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 SMAJ11CAHE3/61 reliable?
The price and inventory of SMAJ11CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHE3/61?
SMAJ11CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHE3/61 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 SMAJ11CAHE3/61?
For technical support, including SMAJ11CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ11CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHE3/61 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 SMAJ11CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHE3/61?
All SMAJ11CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHE3/61, 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 SMAJ11CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ11CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11CAHE3/61 Tags
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