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Vishay General Semiconductor - Diodes Division SMAJ11CAHE3/5A
- Part No.:
- SMAJ11CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHE3/5A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ11CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features a 11 V standoff voltage (VWM), 12.2–13.5 V breakdown range (VBR at 1 mA), 18.2 V clamping voltage (VC) at 22 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SMAJ11CAHE3/5A datasheet, SMAJ11CAHE3/5A pinout, SMAJ11CAHE3/5A application, or SMAJ11CAHE3/5A equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 11 V), but triggers into low-impedance conduction when transients exceed its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response (<1 ns) to ESD events per IEC 61000-4-2.
The SMAJ11CAHE3/5A is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W ≤78 V; 300 W >78 V), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - confirming suitability for surface-mount PCB layouts without forced cooling in ambient temperatures up to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin for 12 V nominal systems |
| VBR (min/max) | 12.2 V / 13.5 V at 1 mA - tight breakdown window ensures predictable turn-on across temperature and unit variation |
| VC @ IPPM | 18.2 V at 22 A - clamps transient energy within safe limits for downstream 20 V-rated ICs like CAN transceivers or ADC drivers |
| PPPM | 400 W (10/1000 μs) - sustains industry-standard lightning/surge pulses without degradation when mounted on 5 mm × 5 mm pads |
| IFSM | 40 A (8.3 ms half-sine) - handles inrush or fault currents in unidirectional variants; not applicable to bidirectional SMAJ11CAHE3/5A |
| TJ max | +150 °C - enables operation in under-hood automotive environments and industrial enclosures with elevated ambient temps |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (during positive half-cycle) | Conducts surge current toward ground when voltage exceeds +VBR; identical to Cathode in bidirectional operation |
| Cathode | Transient current entry (during negative half-cycle) | Conducts surge current toward ground when voltage exceeds –VBR; functionally identical to Anode in this bidirectional device |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules, body electronics, and ADAS sensor interfaces |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without baking or special handling; compatible with standard SMT production lines |
| 400 W peak pulse power | Meets IEC 61000-4-5 Level 3 (1 kV surge) requirements on 5 mm × 5 mm copper pads, eliminating need for external heat sinking |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 16 V absolute maximum-rated microcontrollers and interface ICs |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching signal conditioning amplifier. Use Value: Prevents latch-up or permanent damage to 12-bit ADC inputs by limiting voltage to ≤18.2 V during 400 W surges. |
Use Scenario: Guarding differential data lines in factory automation PLCs against EFT bursts and ground loop surges. IC Role / Device Role / Timing Role: Bidirectional clamping element across A/B bus lines, referenced to local ground plane. Use Value: Maintains signal integrity during 10/1000 μs transients up to ±1 kV while adding <1 pF capacitance to preserve 10 Mbps data rates. |
| Consumer USB Port Protection | Telecom Power Input Stage |
Use Scenario: Safeguarding USB 2.0 D+ and D− lines in smart home hubs against human-body-model ESD (±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance TVS pair placed adjacent to USB connector, with common-ground layout. Use Value: Responds in <1 ns to divert >15 A ESD current, preventing bit errors or PHY reset without degrading 480 Mbps signaling. |
Use Scenario: Front-end surge suppression on 48 V DC telecom power feeds subject to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter input filter, sized for 400 W pulse handling. Use Value: Limits input rail overshoot to ≤18.2 V during 10/1000 μs events, avoiding overvoltage shutdown of 36–75 V input converters. |
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-M3/5A | Same electrical specs and AEC-Q101 qualification; halogen-free molding compound instead of standard RoHS-compliant epoxy | Required only where halogen-free compliance is mandated (e.g., EU public infrastructure projects) | Select SMAJ11CA-M3/5A if halogen-free material specification overrides cost or availability considerations |
| SMCJ11CAHE3/5A | Higher 1500 W peak pulse power (same VWM/VC); larger SMC (DO-214AB) package with 2.3× footprint and higher thermal mass | Suitable for higher-energy threats (e.g., IEC 61000-4-5 Level 4) where board space permits larger package | Choose SMCJ11CAHE3/5A only when 400 W is insufficient and layout allows SMC footprint; otherwise SMAJ11CAHE3/5A offers optimal size/power balance |
Compared with SMAJ11CA-M3/5A, the SMAJ11CAHE3/5A uses standard RoHS-compliant packaging and shares identical surge ratings and automotive qualification; versus SMCJ11CAHE3/5A, it trades 3.75× lower peak power for 58% smaller PCB area and compatibility with fine-pitch SMT placement equipment.
Availability
SMAJ11CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial communication interfaces, consumer USB port hardening, and telecom power input staging requiring stable component supply across multi-year production cycles.
Supply support for SMAJ11CAHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and communications markets - engineered for drop-in replacement of legacy TVS families while meeting AEC-Q101 and RoHS requirements.
FAQ
What is the clamping voltage of the SMAJ11CAHE3/5A at its rated peak pulse current?
The SMAJ11CAHE3/5A has a maximum clamping voltage (VC) of 18.2 V at 22 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that protected circuitry sees no more than 18.2 V during specified surge events - a critical parameter for ensuring compatibility with 20 V absolute maximum-rated ICs. The SMAJ11CAHE3/5A maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is the SMAJ11CAHE3/5A suitable for automotive applications?
Yes, the SMAJ11CAHE3/5A is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD verification required for automotive electronics. Its bidirectional architecture, 11 V standoff voltage, and 18.2 V clamping make it ideal for protecting CAN FD, LIN, and sensor signal lines in engine control units, body control modules, and ADAS subsystems. The SMAJ11CAHE3/5A is explicitly listed in Vishay's automotive-grade ordering codes with HE3 suffix.
How does the SMAJ11CAHE3/5A differ from unidirectional SMAJ11AHE3/5A variants?
The SMAJ11CAHE3/5A is bidirectional, providing symmetrical clamping for both positive and negative transients - essential for AC-coupled or floating lines like RS-485 or USB. In contrast, the unidirectional SMAJ11AHE3/5A has a cathode band marking and conducts only during reverse-bias surges, requiring correct orientation during placement. Both share identical VWM, VBR, and VC values, but the SMAJ11CAHE3/5A eliminates polarity concerns and simplifies layout for differential or dual-rail protection schemes.
What is the thermal resistance and maximum junction temperature of the SMAJ11CAHE3/5A?
The SMAJ11CAHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads. Its maximum operating junction temperature is +150 °C, enabling reliable operation in under-hood automotive environments and sealed industrial enclosures. These thermal characteristics are validated per JEDEC JESD51 standards and confirm that the SMAJ11CAHE3/5A can dissipate 400 W pulses without exceeding safe thermal limits under defined PCB layout conditions.
Does the SMAJ11CAHE3/5A require special handling or baking prior to reflow soldering?
No - the SMAJ11CAHE3/5A is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions and subjected to standard lead-free reflow profiles with peak temperatures up to 260 °C without baking or dry-pack requirements. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and whisker resistance meets JESD201 Class 2. This makes the SMAJ11CAHE3/5A fully compatible with high-throughput SMT assembly lines used for automotive and industrial PCB manufacturing.
SMAJ11CAHE3/5A 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)
SMAJ11CAHE3/5A FAQ
1.How can I place an order for SMAJ11CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHE3/5A 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 SMAJ11CAHE3/5A reliable?
The price and inventory of SMAJ11CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHE3/5A?
SMAJ11CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHE3/5A 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 SMAJ11CAHE3/5A?
For technical support, including SMAJ11CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ11CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHE3/5A 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 SMAJ11CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHE3/5A?
All SMAJ11CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHE3/5A, 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 SMAJ11CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ11CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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