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Vishay General Semiconductor - Diodes Division SMAJ11CAHM3_A/I
- Part No.:
- SMAJ11CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHM3_A/I.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,754
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Product details
Overview
SMAJ11CAHM3_A/I 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 11 V standoff voltage (VWM), 12.2–13.5 V breakdown (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 SMAJ11CAHM3_A/I datasheet, SMAJ11CAHM3_A/I pinout, SMAJ11CAHM3_A/I application, or SMAJ11CAHM3_A/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, AEC-Q101 qualification status, thermal resistance data, and direct alternative part comparisons - all grounded in Vishay's official 88390 document revision 09-Jan-2024.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VWM, and VC values in either direction. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), enabling effective suppression of ESD (IEC 61000-4-2) and lightning-induced transients (IEC 61000-4-5).
Rated for 150 °C maximum junction temperature and MSL Level 1 (260 °C reflow), the device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Its 120 °C/W junction-to-ambient thermal resistance requires minimum 0.2" × 0.2" copper pads per terminal for full 400 W rating - derating applies above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected line. |
| VBR (min/max) | 12.2 V / 13.5 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 18.2 V at 22 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); supports high-energy transients common in automotive load-dump scenarios. |
| IPPM | 22 A - Peak pulse current capability; directly correlates with surge immunity level per IEC 61000-4-5. |
| TJ max. | 150 °C - Maximum junction temperature; sets thermal design limits for PCB layout and power cycling. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; mandates minimum copper pad area (0.2" × 0.2") for rated power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified (HM3 suffix). Dimensions: 4.93 mm × 2.92 mm × 2.29 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | Accepts surge current during positive-going overvoltage; forms symmetrical conduction path with Cathode. |
| Cathode | Transient current entry (negative polarity) | Accepts surge current during negative-going overvoltage; enables bidirectional clamping without polarity marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware placement in AC-coupled or floating signal paths. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV line-to-ground) surges when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR) | 1.42 (18.2 V / 12.85 V avg) - minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to 3.3 V/5 V logic. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak - no moisture sensitivity handling required prior to assembly. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor line and ground, conducting only during overvoltage events. Use Value: Limits transient voltage to ≤18.2 V, safeguarding 5 V tolerant microcontroller inputs and preserving signal integrity under 100 V/50 ms surges. |
Use Scenario: Shielding PLC digital input channels from inductive kickback when switching solenoids or relays in factory automation. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from stored magnetic field collapse (L·di/dt) on 24 V DC lines. Use Value: Clamps 22 A surge within 1 ns, preventing latch-up in optocoupler input stages and extending system uptime in harsh EMI environments. |
| Consumer USB Data Line | Telecom Ethernet PHY Port |
Use Scenario: ESD protection on USB 2.0 D+/D− lines in portable devices exposed to human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor shunting ESD current away from USB transceiver pins. Use Value: Sub-100 pF junction capacitance at 0 V ensures <1% signal distortion at 480 Mbps, meeting USB IF compliance requirements. |
Use Scenario: Secondary-level surge protection on 10/100BASE-TX Ethernet PHY differential pairs in network switches and VoIP gateways. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) limiting induced surges from nearby lightning strikes or power cross-talk. Use Value: 18.2 V clamping prevents PHY damage during 1.2/50 μs open-circuit transients up to 2 kV, maintaining link stability per IEEE 802.3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CAHE3_A/I | Same electrical specs and AEC-Q101 qualification; RoHS-compliant but not halogen-free (E3 vs HM3). | Preferred for commercial/industrial designs where halogen-free mandate is absent; identical footprint and thermal performance. | Select SMAJ11CAHE3_A/I when halogen-free material is not required and cost optimization is prioritized. |
| SMBJ11CAHM3_A/I | Same VWM/VC but higher 600 W PPPM; larger SMB (DO-214AA) package (4.57 mm × 3.94 mm). | Better suited for higher-energy surges (e.g., 10/1000 μs >30 A) where board space allows larger footprint and improved thermal mass. | Choose SMBJ11CAHM3_A/I when surge threat level exceeds 400 W and PCB layout accommodates 25% larger package. |
Compared with SMAJ11CAHM3_A/I, SMAJ11CAHE3_A/I offers identical protection performance without halogen-free compliance, while SMBJ11CAHM3_A/I provides 50% higher surge power handling in a physically larger package - selection depends strictly on material compliance requirements and surge energy budget.
Availability
SMAJ11CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, consumer USB data lines, and telecom Ethernet PHY ports requiring stable component supply, AEC-Q101 validation, and halogen-free construction.
Supply support for SMAJ11CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering consistent clamping, low leakage, and robust surge endurance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ11CAHM3_A/I at its rated peak pulse current?
The SMAJ11CAHM3_A/I has a maximum clamping voltage (VC) of 18.2 V at its rated peak pulse current (IPPM) of 22 A, measured under the standardized 10/1000 μs double-exponential surge waveform. This value is confirmed in Vishay's datasheet 88390, Table "ELECTRICAL CHARACTERISTICS", row for SMAJ11CA. The clamping voltage defines the upper voltage limit imposed on protected circuitry during transient events, making it critical for ensuring compatibility with downstream 3.3 V or 5 V logic interfaces.
Is SMAJ11CAHM3_A/I qualified for automotive applications?
Yes, SMAJ11CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and explicitly stated in the "MECHANICAL DATA" section of Vishay's datasheet 88390. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules and sensor signal conditioning circuits.
What does the "CA" suffix mean in SMAJ11CAHM3_A/I?
The "CA" suffix in SMAJ11CAHM3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMAJ11AHM3_A/I), SMAJ11CAHM3_A/I has no polarity marking and exhibits identical breakdown (12.2–13.5 V), clamping (18.2 V), and leakage characteristics in either direction, simplifying layout for AC-coupled or floating signal lines.
How does the thermal performance of SMAJ11CAHM3_A/I affect PCB layout?
SMAJ11CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, which assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To sustain its full 400 W peak pulse rating, PCB layout must provide these minimum pad dimensions; smaller pads increase thermal impedance and require derating per Figure 2 in datasheet 88390. Failure to meet pad requirements risks localized overheating and reduced surge endurance over repeated events.
What is the maximum reverse leakage current for SMAJ11CAHM3_A/I at its standoff voltage?
The maximum reverse leakage current (ID) for SMAJ11CAHM3_A/I is 1.0 μA at its 11 V standoff voltage (VWM), as specified in the "ELECTRICAL CHARACTERISTICS" table of Vishay's datasheet 88390. This low leakage ensures minimal power loss and signal interference in always-on or battery-powered applications - critical for maintaining accuracy in precision analog sensor front-ends and extending operational lifetime in energy-constrained IoT nodes.
SMAJ11CAHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11CAHM3_A/I FAQ
1.How can I place an order for SMAJ11CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHM3_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 SMAJ11CAHM3_A/I reliable?
The price and inventory of SMAJ11CAHM3_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 SMAJ11CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHM3_A/I?
SMAJ11CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHM3_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 SMAJ11CAHM3_A/I?
For technical support, including SMAJ11CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ11CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHM3_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 SMAJ11CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHM3_A/I?
All SMAJ11CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHM3_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 SMAJ11CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ11CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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