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Vishay General Semiconductor - Diodes Division SMAJ11AHM3/H
- Part No.:
- SMAJ11AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AHM3/H.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,473
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Product details
Overview
SMAJ11AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 11 V stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤18.2 V at 22 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMAJ11AHM3/H datasheet, SMAJ11AHM3/H pinout, SMAJ11AHM3/H application, or SMAJ11AHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, clamping behavior under surge conditions, and direct alternatives for circuit protection design-in.
Technical Context
The SMAJ11AHM3/H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown and low incremental surge resistance. Its 120 °C/W junction-to-ambient thermal resistance (RθJA) and 30 °C/W junction-to-lead (RθJL) support reliable operation up to +150 °C junction temperature under pulsed stress.
It meets J-STD-020 MSL Level 1 moisture sensitivity and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirmed by Vishay's HM3 suffix and "/H" tape-and-reel packaging code. Polarity is marked by a cathode band; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 12.2 V / 13.5 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | ≤18.2 V at 22 A - Clamped voltage under 10/1000 μs surge; determines protected IC's maximum stress exposure. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); supports high-energy ESD and load-switching transients. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| RθJA | 120 °C/W - Thermal resistance to ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by a single band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional TVS configuration; carries surge current to reference plane. |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., CAN_H, sensor output); initiates clamping when voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental regulations and JEDEC JESD201 Class 2 whisker resistance - suitable for green manufacturing. |
| 400 W peak pulse power | Handles high-energy transients from inductive switching (e.g., solenoid drivers) without degradation - critical for industrial PLC I/O protection. |
| Fast response time & low clamping ratio | Sub-nanosecond response and VC/VBR ≈ 1.42 enable tight voltage limiting - protects 3.3 V/5 V logic and analog front-ends from overshoot damage. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60 % RH - eliminates bake requirements prior to reflow, reducing production cost and risk. |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role: Unidirectional TVS placed between signal line and chassis ground to clamp negative transients and limit positive overvoltage. Use Value: Ensures signal integrity and prevents latch-up in microcontrollers and ADCs during vehicle battery disconnection events. |
Use Scenario: Shielding PLC digital input channels from relay coil flyback and field wiring surges in factory automation systems. IC Role / Device Role: Standoff-rated TVS connected across input terminals to divert >1 kV transients before reaching optocoupler or level-shifter inputs. Use Value: Extends system uptime by eliminating false triggering and component failure caused by repetitive 400 W surge events. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding USB-C PD communication lines and VBUS monitoring circuits in wall adapters against ESD and AC line coupling. IC Role / Device Role: Low-capacitance unidirectional TVS placed at connector entry point to shunt fast transients (<1 ns rise) to ground. Use Value: Maintains USB enumeration reliability and prevents damage to USB-PD controllers during human-body-model (HBM) ESD events. |
Use Scenario: Front-end protection of Ethernet PHYs and POTS line interfaces in DSLAMs and base station line cards exposed to lightning-induced surges. IC Role / Device Role: Primary clamping device in multi-stage protection scheme, absorbing bulk energy before secondary MOV or GDT stages. Use Value: Enables compliance with ITU-T K.20/K.21 immunity standards while preserving signal fidelity up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11AHE3/H | Same electrical specs, but RoHS-compliant (non-halogen-free) and commercial-grade - lacks AEC-Q101 qualification. | Approved for consumer and industrial use only; not permitted in automotive ECUs or safety-critical modules. | Select when AEC-Q101 is unnecessary and halogen-free content is not mandated by OEM sourcing policy. |
| SMBJ11A-H | Higher 600 W PPPM, same VWM/VC, but larger SMB (DO-214AA) package - 2.5× higher RθJA (300 °C/W). | Better surge endurance but requires more PCB area and has reduced thermal performance on small pads. | Choose when surge energy exceeds 400 W limits and board space allows larger footprint; avoid if thermal budget is constrained. |
Compared with SMAJ11AHM3/H, SMAJ11AHE3/H offers identical clamping and standoff but omits automotive qualification and halogen-free materials, while SMBJ11A-H trades compact size for higher pulse power and relaxed thermal design margins.
Availability
SMAJ11AHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ11AHM3/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, MOSFETs, 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 applications where consistent clamping, thermal stability, and qualification compliance are mandatory.
FAQ
What does the "HM3/H" suffix indicate in SMAJ11AHM3/H?
The "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction; the "/H" specifies 7-inch tape-and-reel packaging with 1800 units per reel. This suffix confirms full automotive qualification, environmental compliance, and standardized automated assembly compatibility - all verified in Vishay's official ordering information table.
Is SMAJ11AHM3/H bidirectional or unidirectional?
SMAJ11AHM3/H is unidirectional. Its part number lacks the "CA" suffix (e.g., SMAJ11CA), and Vishay's datasheet explicitly lists it in the "UNI" column of the Electrical Characteristics table with cathode-band polarity marking. Bidirectional variants exhibit symmetric breakdown in both directions and carry no polarity mark.
What is the maximum clamping voltage of SMAJ11AHM3/H at rated surge current?
The maximum clamping voltage (VC) of SMAJ11AHM3/H is 18.2 V at 22 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and appears in the "MAXIMUM CLAMPING VOLTAGE AT IPPM" column of the datasheet's electrical characteristics table for the SMAJ11A row.
Can SMAJ11AHM3/H replace SMAJ11A-E3 in an existing design?
SMAJ11AHM3/H can replace SMAJ11A-E3 electrically and mechanically, but only if AEC-Q101 qualification and halogen-free content are required. The HM3 variant adds automotive qualification and halogen-free molding compound versus the E3's commercial-grade RoHS compliance - no changes to PCB layout or circuit function are needed, provided the application demands those enhanced attributes.
What is the thermal resistance of SMAJ11AHM3/H, and how does it affect PCB layout?
SMAJ11AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's package drawing; reducing pad area increases RθJA, risking thermal runaway during repetitive surges - so maintaining specified copper area is essential for sustained 3.3 W power dissipation capability.
SMAJ11AHM3/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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ11AHM3/H FAQ
1.How can I place an order for SMAJ11AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AHM3/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 SMAJ11AHM3/H reliable?
The price and inventory of SMAJ11AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ11AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AHM3/H?
SMAJ11AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AHM3/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 SMAJ11AHM3/H?
For technical support, including SMAJ11AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AHM3/H requirements.
6.How does Aetrix verify that SMAJ11AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ11AHM3/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 SMAJ11AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ11AHM3/H?
All SMAJ11AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AHM3/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 SMAJ11AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ11AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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