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Vishay General Semiconductor - Diodes Division SMAJ11CAHM3/I
- Part No.:
- SMAJ11CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAHM3/I.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,565
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Product details
Overview
SMAJ11CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping ESD and surge transients on signal/power lines. It features 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 rating with 10/1000 μs waveform - used to protect automotive sensor interfaces, industrial I/O ports, and USB/RS-485 data lines.
For engineers reviewing the SMAJ11CAHM3/I datasheet, SMAJ11CAHM3/I pinout, SMAJ11CAHM3/I application, or SMAJ11CAHM3/I equivalent, this device serves as a halogen-free, AEC-Q101 qualified TVS for bidirectional overvoltage protection where low clamping voltage, fast response (<1 ps), and MSL Level 1 reflow compatibility are critical selection criteria.
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 stress.
Thermal design relies on RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for full 400 W rating. Derating begins above TA = 25 °C per Figure 2, with maximum junction temperature limited to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal swing range for protected line. |
| VBR (min/max) | 12.2 V / 13.5 V at IT = 1 mA - Confirmed breakdown threshold ensures reliable turn-on during transients without false triggering. |
| VC @ IPPM | 18.2 V at 22 A - Clamped voltage seen by downstream circuitry during 10/1000 μs surge; limits stress on IC inputs. |
| PPPM | 400 W - Peak pulse power handling capability with 0.01 % duty cycle; supports single-event lightning/inductive-spike suppression. |
| IPPM | 22 A - Peak surge current capacity at rated VC; determines survivability against IEC 61000-4-5 Level 4 (4 kV/2 Ω) events. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in under-hood automotive, industrial control cabinets, and outdoor telecom equipment. |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch; compatible with automated placement and J-STD-020 260 °C reflow profile. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Conducts surge energy into device during positive overvoltage; symmetrical with cathode for bidirectional clamping. |
| Cathode | Transient current entry point (negative half-cycle) | Conducts surge energy into device during negative overvoltage; functionally identical to anode in bidirectional configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout on AC-coupled or differential lines. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - suitable for engine control, ADAS sensors, and infotainment I/O. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead finish - meets EU ELV and JEDEC J-STD-203 requirements for green manufacturing. |
| Low clamping ratio | VC/VWM = 1.65 - minimizes voltage overshoot during surge, reducing risk of latch-up or gate oxide damage in protected MOSFETs or microcontrollers. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60 % RH - enables standard SMT assembly without dry-pack or baking preconditioning. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between connector and transceiver IC input pins. Use Value: Limits transient voltage to ≤18.2 V during 22 A surge, preventing damage to 5 V or 3.3 V tolerant receiver stages while maintaining signal integrity. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., THVD1550) against EFT bursts and lightning-induced surges on long cable runs in factory automation. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground TVS on A/B differential pair and common-mode reference path. Use Value: Clamps common-mode transients to <18.2 V within <1 ps, preserving bus timing margins and avoiding false logic transitions during EMC testing. |
| USB 2.0 Data Line Protection | DC Power Input Surge Suppression |
Use Scenario: Shielding USB D+/D− lines in portable medical devices and industrial handhelds from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at USB connector pins. Use Value: Delivers <1.0 μA leakage at 11 V and sub-18.2 V clamping, ensuring no signal attenuation or eye-diagram degradation at 480 Mbps. |
Use Scenario: Front-end protection for 12 V DC power rails feeding microcontrollers, displays, and motor drivers in vending machines and kiosks. IC Role / Device Role / Timing Role: Parallel-connected TVS between VIN and GND to shunt inductive switch-off spikes. Use Value: Absorbs 400 W surges up to 22 A without failure, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity standards. |
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/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen content is unrestricted (e.g., commercial HVAC controls). | Select SMAJ11CAHE3/I when cost sensitivity outweighs halogen-free requirement and automotive qualification remains mandatory. |
| SMBJ11CAHM3/I | Same VWM/VC but higher PPPM = 600 W; larger SMB (DO-214AA) package with 4.3 mm width vs. SMA's 2.6 mm. | Preferred for higher-energy surge environments (e.g., outdoor telecom power supplies) where PCB space permits. | Choose SMBJ11CAHM3/I only if system-level surge testing exceeds 400 W capability and board layout accommodates wider footprint. |
Compared with SMAJ11CAHM3/I, SMAJ11CAHE3/I offers identical protection performance without halogen-free assurance, while SMBJ11CAHM3/I delivers 50 % higher surge energy handling at the cost of increased board area and thermal mass - making SMAJ11CAHM3/I optimal for space-constrained AEC-Q101 designs needing balanced power density and green compliance.
Availability
SMAJ11CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, and DC power input stages requiring stable component supply with guaranteed halogen-free and AEC-Q101 qualified sourcing.
Supply support for SMAJ11CAHM3/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for rapid response, low clamping, and robust thermal performance in surface-mount form factors.
FAQ
What is the maximum clamping voltage of the SMAJ11CAHM3/I under a 10/1000 μs surge?
The SMAJ11CAHM3/I exhibits a maximum clamping voltage (VC) of 18.2 V when subjected to its rated peak pulse current of 22 A with a 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88390, and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ11CAHM3/I maintains this clamping performance bidirectionally due to its symmetrical construction.
Is SMAJ11CAHM3/I suitable for automotive applications?
Yes, SMAJ11CAHM3/I is AEC-Q101 qualified per Vishay's ordering code definition, confirming validation for automotive-grade temperature cycling, humidity bias, and surge endurance. Its −55 °C to +150 °C operating range, MSL Level 1 reflow compatibility, and halogen-free HM3 suffix make it appropriate for engine control units, body electronics, and ADAS sensor interfaces. The SMAJ11CAHM3/I meets automotive ESD and surge immunity requirements when applied per recommended PCB layout guidelines.
How does the bidirectional nature of SMAJ11CAHM3/I affect its placement on a PCB?
The SMAJ11CAHM3/I has no polarity marking and functions identically in both directions, so it can be placed without orientation constraints on AC-coupled or differential signal paths such as RS-485, CAN, or USB lines. Unlike unidirectional TVS diodes, there is no cathode band to align - simplifying automated placement and eliminating risk of reverse installation. This symmetry is confirmed in the "DEVICES FOR BIDIRECTION APPLICATIONS" section of the Vishay datasheet for SMAJ11CAHM3/I.
What is the leakage current specification for SMAJ11CAHM3/I at its stand-off voltage?
At its 11 V stand-off voltage (VWM), the SMAJ11CAHM3/I specifies a maximum reverse leakage current (ID) of 1.0 μA at TA = 25 °C, as stated in the Electrical Characteristics table on page 2 of Vishay document 88390. This low leakage ensures minimal loading on high-impedance signal lines and preserves battery life in always-on automotive modules where the SMAJ11CAHM3/I may be deployed.
Does SMAJ11CAHM3/I require derating at elevated ambient temperatures?
Yes, the SMAJ11CAHM3/I must be derated above TA = 25 °C, as shown in Figure 2 of the Vishay datasheet. Its peak pulse power rating decreases linearly to ~70 % at 85 °C ambient and ~50 % at 125 °C. This derating applies to both single-pulse and repetitive surge conditions and is essential for reliable operation in under-hood or enclosed industrial environments where the SMAJ11CAHM3/I may experience sustained high temperatures.
SMAJ11CAHM3/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:
- 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/I FAQ
1.How can I place an order for SMAJ11CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAHM3/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/I reliable?
The price and inventory of SMAJ11CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ11CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAHM3/I?
SMAJ11CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAHM3/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/I?
For technical support, including SMAJ11CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAHM3/I requirements.
6.How does Aetrix verify that SMAJ11CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ11CAHM3/I?
All SMAJ11CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ11CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11CAHM3/I Tags
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