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Vishay General Semiconductor - Diodes Division SMAJ11CAHM3/H
- Part No.:
- SMAJ11CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHM3/H.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,958
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Product details
Overview
SMAJ11CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 11 V standoff voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), and clamps transients to ≤18.2 V at 22 A, making it suitable for protecting MOSFET gates, sensor interfaces, and automotive control modules.
For engineers reviewing the SMAJ11CAHM3/H datasheet, SMAJ11CAHM3/H pinout, SMAJ11CAHM3/H application, or SMAJ11CAHM3/H equivalent, this device is evaluated for ESD and inductive switching surge suppression in AEC-Q101-compliant automotive subsystems, industrial I/O ports, and low-voltage DC power rails where fast response (<1 ns), low clamping voltage, and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in either direction. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance under repetitive surge conditions.
Designed for surface-mount assembly on standard 0.2" × 0.2" copper pads, the device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation at TJ = –55 to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 12.2 V / 13.5 V at 1 mA - Confirmed breakdown threshold ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤18.2 V at 22 A - Clamped voltage under 400 W 10/1000 μs surge; limits stress on downstream ICs like microcontrollers or transceivers. |
| IPPM | 22 A - Peak surge current capability with defined waveform; validates protection level against ISO 7637-2 Pulse 1/2a/5a. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity; determines survivability of common automotive and industrial transients. |
| TJ Range | –55 °C to +150 °C - Full operational temperature envelope supporting under-hood and industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound. Bidirectional construction means no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (both ends) | Surge current path (bidirectional) | Either terminal accepts positive or negative transients; no cathode band marking; enables placement without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance mandates for Tier 1 automotive suppliers and industrial OEMs without compromising surge robustness. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump spikes and relay coil flyback without degradation. |
| Fast response time (<1 ns) | Clamps before sensitive logic or analog circuitry sustains damage, preserving signal integrity in high-speed interfaces. |
| Low incremental surge resistance | Minimizes voltage overshoot during clamping, reducing risk of secondary overstress on protected components. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in body control modules from ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDOs and MCU power inputs. Use Value: Limits rail voltage to ≤18.2 V during 22 A surges, preventing brownout reset or permanent damage to 5 V/3.3 V regulators. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional shunt protector located at connector entry point, before signal conditioning amplifiers. Use Value: Sub-1 ns response prevents >15 V transients from reaching precision op-amps, maintaining measurement accuracy and long-term reliability. |
| Consumer USB Port ESD Suppression | Telecom Data Line Surge Protection |
Use Scenario: Safeguarding USB 2.0 D+/D– lines in portable devices against IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at USB receptacle, parallel to data lines. Use Value: Clamps ESD pulses to <18.2 V while adding <10 pF capacitance, avoiding signal integrity loss at 480 Mbps. |
Use Scenario: Protecting RS-485 transceiver inputs in base station backhaul equipment exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage surge limiter mounted at PCB edge connector, ahead of isolation and transceiver ICs. Use Value: Absorbs 400 W transients per line pair, enabling compliance with ITU-T K.21 basic protection level without external GDTs. |
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/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial automotive modules where halogen-free is not mandated by Tier 1 spec. | Select when cost sensitivity outweighs halogen-free requirement and full AEC-Q101 validation is needed. |
| SMBJ11CAHM3 | Same VWM/VBR/VC, but SMB package (DO-214AA); 600 W PPPM rating due to larger thermal mass. | Better suited for higher-energy surges (e.g., 12 V battery line in start-stop systems) where board space allows larger footprint. | Choose when surge energy exceeds 400 W or thermal dissipation margin is critical; requires PCB layout change. |
Compared with SMAJ11CAHM3/H, SMAJ11CAHE3/H offers identical protection performance without halogen-free assurance, while SMBJ11CAHM3 provides higher surge capacity in a larger package-making SMAJ11CAHM3/H optimal for space-constrained, halogen-free automotive and industrial designs requiring validated AEC-Q101 reliability.
Availability
SMAJ11CAHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and telecom interface protection requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMAJ11CAHM3/H 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where consistent clamping, low leakage, and long-term stability are non-negotiable.
FAQ
What does the 'HM3' suffix indicate in SMAJ11CAHM3/H?
The 'HM3' suffix in SMAJ11CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive-grade reliability testing, absence of brominated flame retardants, and suitability for high-reliability applications where material content restrictions apply-distinct from 'HE3' (RoHS/AEC-Q101 but not halogen-free) and 'E3' (commercial RoHS only).
Is SMAJ11CAHM3/H unidirectional or bidirectional?
SMAJ11CAHM3/H is a bidirectional TVS diode, as confirmed by the 'CA' suffix and its symmetric electrical characteristics: identical VBR, VC, and IPPM values for both polarities. It has no polarity marking and functions identically whether positive or negative transients occur-ideal for AC-coupled lines or differential buses like RS-485.
What is the maximum clamping voltage of SMAJ11CAHM3/H under surge conditions?
The maximum clamping voltage (VC) of SMAJ11CAHM3/H is 18.2 V at 22 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Document Number 88390, Rev. 09-Jan-2024) and represents the upper limit of voltage seen by protected circuitry during worst-case surge events.
Can SMAJ11CAHM3/H replace SMAJ11A in a design?
No-SMAJ11CAHM3/H is bidirectional, while SMAJ11A is unidirectional. Replacing SMAJ11A with SMAJ11CAHM3/H may cause unintended conduction in DC-biased circuits due to lack of polarity control. The cathode band on SMAJ11A enables directional clamping; SMAJ11CAHM3/H lacks this marking and conducts equally in both directions, requiring schematic and layout review before substitution.
Does SMAJ11CAHM3/H meet automotive qualification standards?
Yes-SMAJ11CAHM3/H is AEC-Q101 qualified, as explicitly stated in Vishay's ordering information table (page 3, note 1) and product family description. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, validating its use in automotive powertrain, chassis, and body electronics where reliability under thermal and mechanical stress is critical.
SMAJ11CAHM3/H 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:
- 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/H FAQ
1.How can I place an order for SMAJ11CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHM3/H 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/H reliable?
The price and inventory of SMAJ11CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHM3/H?
SMAJ11CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHM3/H 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/H?
For technical support, including SMAJ11CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHM3/H requirements.
6.How does Aetrix verify that SMAJ11CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHM3/H?
All SMAJ11CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ11CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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