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Vishay General Semiconductor - Diodes Division SMAJ11CAHM3_A/H
- Part No.:
- SMAJ11CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHM3_A/H.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
SMAJ11CAHM3_A/H 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 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 (10/1000 μs waveform). It is used to protect MOSFET gates, sensor interfaces, and automotive control inputs against inductive switching transients.
For engineers reviewing the SMAJ11CAHM3_A/H datasheet, SMAJ11CAHM3_A/H pinout, SMAJ11CAHM3_A/H application, or SMAJ11CAHM3_A/H equivalent, this part delivers verified bidirectional clamping performance, AEC-Q101 qualification for automotive use, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability PCB designs in harsh environments.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports fast, predictable clamping under repetitive transients.
The device is rated for 150 °C maximum junction temperature and exhibits a +0.080 %/°C temperature coefficient of VBR, ensuring predictable voltage drift across operating range. Its thermal resistance (RθJA = 120 °C/W) is specified with 0.2" × 0.2" copper pads, aligning with standard surface-mount layout practices for industrial and automotive PCBs.
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 - Confirmed breakdown onset range; ensures reliable triggering during overvoltage events |
| VC (Clamping Voltage) | 18.2 V at 22 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 400 W - Sustains standardized 10/1000 μs surge without failure; derates to 300 W above 78 V |
| IPPM (Peak Pulse Current) | 22 A - Maximum non-repetitive surge current it can divert; determines protection level for IEC 61000-4-5 Level 3 |
| TJ max. | 150 °C - Enables operation in under-hood automotive or industrial enclosures without thermal derating penalties |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline; compatible with automated placement and reflow profiles up to 260 °C peak |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Polarity: unmarked for bidirectional types; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One side of symmetrical P-N junction; conducts during negative voltage excursions relative to cathode reference |
| Cathode | Transient current entry (positive half-cycle) | Other side of symmetrical P-N junction; conducts during positive voltage excursions - functionally identical to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations without compromising surge robustness or thermal performance |
| 400 W peak pulse power (10/1000 μs) | Provides protection against IEC 61000-4-5 surge events up to 1 kV/500 A open-circuit (with appropriate source impedance) |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without baking or special handling; eliminates moisture-related popcorning risk |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfaces |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ps to transients exceeding VWM. Use Value: Prevents latch-up or gate oxide damage in 5 V-tolerant transceivers by limiting excursion to ≤18.2 V during 22 A surges. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from 100–200 V, 1–10 A transients induced by 24 V DC solenoid switching. Use Value: Extends mean time between failures (MTBF) by eliminating field returns caused by transient-induced firmware resets or input latch faults. |
| 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, downstream of primary polymer-based TVS. IC Role / Device Role / Timing Role: Fast-clamping diode shunting ±15 kV HBM ESD pulses to ground before reaching USB PHY ICs. Use Value: Achieves IEC 61000-4-2 Level 4 (±15 kV contact) immunity without degrading signal integrity due to low junction capacitance (~100 pF at 0 V). |
Use Scenario: Protecting Ethernet PHY front-end circuits and RS-485 transceivers in base station backhaul equipment from lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Standoff-clamp device mounted across differential pair, conducting symmetrically to limit common-mode overvoltage. Use Value: Maintains signal fidelity during surge events by clamping differential swing to <36.4 V (2×VC) while preserving DC bias stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CAHE3_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free; lacks HM3's bromine/chlorine restriction | Approved for commercial/industrial use where halogen-free mandate does not apply (e.g., non-automotive consumer goods) | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not mandatory |
| SMBJ11CAHM3_A/H | Same VWM/VC, but SMB package (DO-214AA); 600 W PPPM; higher IPPM (36.7 A) | Better suited for higher-energy surges (e.g., 48 V telecom systems); requires larger PCB footprint | Choose when surge threat exceeds 400 W capability and board space permits SMB outline |
Compared with SMAJ11CAHE3_A/H, the SMAJ11CAHM3_A/H adds halogen-free compliance without sacrificing clamping performance; versus SMBJ11CAHM3_A/H, it trades 200 W pulse power headroom for 30 % smaller PCB area - optimizing for space-constrained automotive ECUs.
Availability
SMAJ11CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom line protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMAJ11CAHM3_A/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-speed transient suppression in demanding environments - targeting automotive, industrial, and communications systems where consistent clamping behavior and AEC-Q101 validation are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ11CAHM3_A/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance requirements. It confirms the device contains no brominated or chlorinated flame retardants, satisfying strict environmental mandates for automotive and green electronics programs - a key differentiator from the "HE3" variant which is RoHS-compliant but not halogen-free. SMAJ11CAHM3_A/H maintains identical electrical performance to HE3 versions.
Is SMAJ11CAHM3_A/H suitable for protecting 3.3 V logic circuits?
Yes, SMAJ11CAHM3_A/H is appropriate for safeguarding 3.3 V logic circuits when used with proper series impedance (e.g., 10–100 Ω current-limiting resistor). Its 11 V stand-off voltage provides ample margin above 3.3 V rail, while its 18.2 V clamping voltage prevents destructive overvoltage - provided the protected IC's absolute maximum rating exceeds VC. For tighter clamping, consider lower-VWM variants like SMAJ6.0CAHM3_A/H.
Does SMAJ11CAHM3_A/H meet AEC-Q101 requirements?
Yes, SMAJ11CAHM3_A/H is explicitly qualified to AEC-Q101 Rev D for stress tests including HTGB, H3TRB, TCT, and ESD (HBM ≥ 8 kV). This qualification is confirmed in Vishay's ordering information table (page 3) and applies to all HM3-suffix parts in the SMAJ family. The "HM3" designation itself signals AEC-Q101 compliance alongside halogen-free status.
What is the maximum operating temperature for SMAJ11CAHM3_A/H?
The maximum junction temperature (TJmax) for SMAJ11CAHM3_A/H is 150 °C, as specified in the Thermal Characteristics table. This allows continuous operation in under-hood automotive environments or enclosed industrial enclosures. Derating begins above 25 °C ambient per Figure 2, with power dissipation falling to ~1.8 W at 100 °C ambient - sufficient for most low-duty-cycle surge scenarios.
How does the bidirectional design of SMAJ11CAHM3_A/H affect its PCB layout?
The bidirectional design of SMAJ11CAHM3_A/H eliminates polarity concerns: it can be placed across any two nodes (e.g., signal-to-ground or differential pair) without regard to anode/cathode orientation. No band marking is present on the SMA package, simplifying automated placement and reducing assembly errors. Layout must still follow recommended 0.2" × 0.2" copper pads per terminal to achieve rated 400 W pulse power and thermal performance.
SMAJ11CAHM3_A/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:
- 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/H FAQ
1.How can I place an order for SMAJ11CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHM3_A/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_A/H reliable?
The price and inventory of SMAJ11CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHM3_A/H?
SMAJ11CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHM3_A/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_A/H?
For technical support, including SMAJ11CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ11CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHM3_A/H?
All SMAJ11CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMAJ11CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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