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Vishay General Semiconductor - Diodes Division SMAJ100CAHM3/I
- Part No.:
- SMAJ100CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100CAHM3/I.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,970
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Product details
Overview
SMAJ100CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 100 V standoff voltage (VWM), 111–123 V breakdown range (VBR at 1 mA), 162 V maximum clamping voltage (VC) at 1.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ100CAHM3/I datasheet, SMAJ100CAHM3/I pinout, SMAJ100CAHM3/I application, or SMAJ100CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This device operates as a voltage-clamped surge protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but switches to low-impedance conduction within <1 ps when transients exceed VBR, diverting surge energy away from downstream ICs. Its bidirectional architecture ensures symmetric clamping in both polarities, eliminating polarity dependency in AC-coupled or floating signal paths.
The SMAJ100CAHM3/I uses a glass-passivated silicon junction for stable breakdown characteristics and low incremental surge resistance (typical Rdyn ≈ 33 Ω), enabling consistent clamping performance across repetitive surges. Thermal design relies on its 30 °C/W junction-to-lead resistance and 120 °C/W junction-to-ambient rating, requiring minimum 5.0 mm × 5.0 mm copper pad area per terminal for full 400 W rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 111 V / 123 V at 1 mA - Verified breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 162 V at 1.9 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 μs waveform; derates to 300 W above 78 V per spec. |
| IFSM | 40 A - Peak forward surge current rating (8.3 ms half-sine); supports unidirectional surge events in hybrid protection schemes. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| MSL Level | Level 1 (J-STD-020) - No floor life limitation; suitable for standard reflow without dry-pack or baking requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity: unmarked for bidirectional types; no cathode/anode designation required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common connection point for bidirectional clamping; electrically symmetrical with cathode terminal. |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode in CA devices; forms dual-path surge shunt between line and ground or differential pair. |
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. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV) surges on 50 Ω source impedance when mounted on recommended 5.0 mm × 5.0 mm pads. |
| Glass passivated junction | Ensures stable VBR tolerance (±5 % typical), low leakage (<1 μA at VWM), and long-term parameter stability under thermal stress. |
| Low profile SMA package | Height ≤ 2.29 mm enables use in space-constrained modules such as CAN transceiver PCBs and battery management sensors. |
| MSL Level 1 rating | Eliminates moisture sensitivity concerns during reflow; supports direct placement into high-volume SMT lines without dry storage or bake-out. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and LIN/CAN transceivers from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed between VBAT and GND, absorbing >100 V spikes within nanoseconds. Use Value: Prevents latch-up or permanent damage to MCU I/O and power domains during ISO 7637-2 Pulse 5a (load dump) events. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) bidirectional clamp across differential or single-ended signal pairs near connector entry points. Use Value: Maintains signal integrity while meeting IEC 61000-4-2 Level 4 (±8 kV contact) and IEC 61000-4-4 Level 3 (±2 kV fast transient) immunity requirements. |
| Telecom Equipment DC Input Protection | Consumer Device USB/Power Port Protection |
Use Scenario: Safeguarding PoE-powered switches and base station RF front-end supplies against lightning-induced surges on 48 V DC inputs. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC-DC converters and hot-swap controllers. Use Value: Limits clamped voltage to ≤162 V, ensuring downstream components remain within absolute maximum ratings during 10/1000 μs surges up to 400 W. | Use Scenario: Adding secondary-level surge protection to USB-C PD ports and external power adapters in smart home hubs and portable audio devices. IC Role / Device Role / Timing Role: Secondary TVS after primary fuse or polyfuse, providing precise clamping for ±100 V transients on VBUS lines. Use Value: Enables compliance with UL 62368-1 Annex D and IEC 62368-1 surge withstand requirements without compromising compact form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100CAHE3/I | Same electrical specs and AEC-Q101 qualification; RoHS-compliant but not halogen-free. | Acceptable where halogen-free material is not mandated by end-equipment environmental policy. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 compliance remains essential. |
| SMBJ100CAHM3/I | Same VWM/VC specs but SMB (DO-214AA) package - 2.5× higher PPPM (600 W) and larger footprint (4.58 mm × 3.94 mm vs. 4.50 mm × 2.79 mm). | Better suited for higher-energy surge environments (e.g., industrial motor drives) where board space allows larger package. | Choose when surge energy exceeds 400 W capability and PCB layout permits SMB footprint. |
Compared with SMAJ100CAHE3/I, the SMAJ100CAHM3/I adds halogen-free construction for stricter environmental compliance; versus SMBJ100CAHM3/I, it trades 200 W peak power headroom for 30 % smaller board area and lower profile - critical for dense automotive modules.
Availability
SMAJ100CAHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power systems requiring stable component supply with AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ100CAHM3/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, precision, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and lightning-induced surges is non-negotiable.
FAQ
What does the "CA" suffix indicate in SMAJ100CAHM3/I?
The "CA" suffix in SMAJ100CAHM3/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities - unlike unidirectional "A" variants that require correct cathode orientation. This eliminates polarity concerns in AC-coupled circuits, differential signaling, or floating grounds, and ensures identical clamping behavior whether the surge is positive or negative relative to the reference plane. SMAJ100CAHM3/I is therefore ideal for protecting bidirectional data lines or ungrounded power domains.
Is SMAJ100CAHM3/I qualified for automotive applications?
Yes, SMAJ100CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure ("HM3" suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥ 8 kV), validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules, lighting drivers, and infotainment power supplies. Full test reports are available upon request from Vishay.
What is the maximum clamping voltage of SMAJ100CAHM3/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ100CAHM3/I is 162 V, measured at a peak pulse current (IPPM) of 1.9 A using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events, and is guaranteed across temperature (−55 °C to +150 °C) and lifetime. Designers must ensure downstream components' absolute maximum ratings exceed 162 V to guarantee robust protection.
How does the HM3 suffix differ from HE3 in SMAJ100CAHM3/I?
The "HM3" suffix in SMAJ100CAHM3/I specifies halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas "HE3" indicates RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both meet the same electrical specifications and reliability standards, but HM3 complies with additional environmental regulations such as JEDEC JS709E and IPC-1752A for bromine/chlorine content <900 ppm. SMAJ100CAHM3/I is selected when halogen-free materials are mandated by end-customer sustainability policies or regional legislation.
What PCB layout guidance applies to SMAJ100CAHM3/I for full 400 W rating?
To achieve the full 400 W peak pulse power rating, SMAJ100CAHM3/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 1 and thermal characterization. Smaller pads reduce heat dissipation, causing derating - e.g., 250 W at 100 °C ambient. Trace width should be ≥1.0 mm, and thermal vias (≥4 per pad, 0.3 mm diameter) are recommended for multilayer boards to enhance junction-to-plane conduction. Avoid narrow necks or thermal isolation around the SMA footprint.
SMAJ100CAHM3/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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- 1.9A
- 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)
SMAJ100CAHM3/I FAQ
1.How can I place an order for SMAJ100CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100CAHM3/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 SMAJ100CAHM3/I reliable?
The price and inventory of SMAJ100CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ100CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100CAHM3/I?
SMAJ100CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100CAHM3/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 SMAJ100CAHM3/I?
For technical support, including SMAJ100CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100CAHM3/I requirements.
6.How does Aetrix verify that SMAJ100CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ100CAHM3/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 SMAJ100CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ100CAHM3/I?
All SMAJ100CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100CAHM3/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 SMAJ100CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ100CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ100CAHM3/I Tags
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