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Vishay General Semiconductor - Diodes Division SMAJ9.0CAHE3/5A
- Part No.:
- SMAJ9.0CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0CAHE3/5A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,047
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Product details
Overview
SMAJ9.0CAHE3/5A 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 9.0 V standoff voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA, 15.4 V maximum clamping voltage (VC) at 26.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMAJ9.0CAHE3/5A datasheet, SMAJ9.0CAHE3/5A pinout, SMAJ9.0CAHE3/5A application, or SMAJ9.0CAHE3/5A equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.71), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB pad layouts.
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 transient voltage exceeds VBR, diverting surge current away from protected circuitry. Its bidirectional symmetry ensures identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
The SMAJ9.0CAHE3/5A uses a glass-passivated silicon junction and is rated for repetitive 400 W pulses (duty cycle 0.01%) on infinite heatsink, derating linearly above 25 °C ambient per Fig. 2. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation up to TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 9.0 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 10.0–11.1 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | 15.4 V at 26.0 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge; determines safe IC tolerance margin |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy-handling capability for standard lightning/ESD waveforms; derates to 300 W above 78 V |
| IPPM (Peak Pulse Current) | 26.0 A - Maximum surge current diverted without failure; validated per IEC 61000-4-5 Level 4 |
| TJmax | 150 °C - Maximum junction temperature; enables use in under-hood automotive environments |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline; 0.208" × 0.157" footprint with matte tin-plated leads |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case meeting UL 94 V-0 flammability rating; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102; bidirectional construction has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity surge) | Conducts during negative-going transients; symmetric with cathode for bidirectional clamping |
| Cathode | Transient current entry (positive polarity surge) | Conducts during positive-going transients; electrically identical to anode in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ADAS and powertrain modules |
| 400 W peak pulse power | Handles IEC 61000-4-5 4 kV surge (10/1000 μs) without degradation; supports industrial equipment immunity requirements |
| Low clamping ratio (VC/VWM = 1.71) | Minimizes voltage overshoot across protected ICs - critical for 3.3 V and 5 V logic interfaces |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking; reduces manufacturing complexity and cost |
| Glass-passivated junction | Enhances long-term stability and leakage performance under thermal stress and humidity exposure |
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 ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt transients before reaching signal conditioning ICs. Use Value: Maintains signal integrity under 12 V/24 V system surges up to ±100 V; AEC-Q101 qualification ensures field reliability in harsh environments. |
Use Scenario: Safeguarding digital input/output channels in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated 24 V DC I/O lines, working in concert with optocouplers and TVS arrays. Use Value: Limits clamped voltage to 15.4 V - well below 30 V absolute maximum ratings of common industrial interface ICs. |
| Consumer Power Adapter ESD Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-side surge suppression in USB-C PD adapters and wireless charging circuits against human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Fast-response TVS placed across output rails (5 V/9 V/15 V/20 V) to prevent latch-up in synchronous rectifiers and controller ICs. Use Value: Sub-nanosecond response time and 15.4 V clamping ensure downstream GaN FETs and MCU reset lines remain undamaged during 8 kV contact discharge. |
Use Scenario: Overvoltage protection on Ethernet PHY differential pairs and telephone line interfaces subject to lightning-induced surges. IC Role / Device Role / Timing Role: Symmetrical bidirectional clamp across balanced signal lines (e.g., RJ45 pins) to preserve common-mode rejection while limiting differential overvoltage. Use Value: Identical VBR and VC in both directions maintains signal symmetry and prevents DC bias shift during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0CA-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free compliance is mandated by OEM or regional regulation | Choose SMAJ9.0CA-M3/5A when material content restrictions apply; otherwise SMAJ9.0CAHE3/5A offers same performance with standard RoHS compliance. |
| SMBJ9.0CAHE3/5A | Same VWM/VBR/VC, but SMB (DO-214AA) package - 29 % larger footprint and 600 W PPPM | Higher power handling suits higher-energy surge environments (e.g., outdoor telecom cabinets); requires PCB layout change | Choose SMBJ9.0CAHE3/5A only if 600 W rating is required and board space permits larger package; SMAJ9.0CAHE3/5A remains optimal for space-constrained automotive modules. |
Compared with SMAJ9.0CA-M3/5A, the SMAJ9.0CAHE3/5A provides identical protection performance with standard RoHS compliance, while SMBJ9.0CAHE3/5A trades compactness for +50 % surge power - making SMAJ9.0CAHE3/5A the preferred choice for AEC-Q101-compliant, space-sensitive designs requiring 400 W capability.
Availability
SMAJ9.0CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, consumer power adapter secondary sides, and telecom line interface protection requiring stable component supply, AEC-Q101 validation, and consistent surge immunity performance.
Supply support for SMAJ9.0CAHE3/5A 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 was engineered for high-reliability transient suppression in automotive, industrial, and computing applications - delivering fast response, precise clamping, and robust packaging for demanding real-world surge environments.
FAQ
What does the "CA" suffix indicate in SMAJ9.0CAHE3/5A?
The "CA" suffix denotes a bidirectional configuration: SMAJ9.0CAHE3/5A provides symmetrical clamping for both positive and negative voltage transients, with identical VBR (10.0–11.1 V) and VC (15.4 V) in either polarity. This eliminates the need for polarity-aware placement and makes it ideal for AC-coupled or floating signal lines where surge direction is unpredictable - unlike unidirectional "A" variants that require correct cathode orientation.
Is SMAJ9.0CAHE3/5A suitable for automotive applications?
Yes, SMAJ9.0CAHE3/5A is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 150 °C maximum junction temperature, MSL Level 1 reflow compatibility, and validation against temperature cycling, HTRB, and ESD stress make it appropriate for ADAS sensors, body control modules, and infotainment power supplies - provided layout follows Vishay's recommended 0.2" × 0.2" copper pad guidelines for thermal performance.
How does the clamping voltage of SMAJ9.0CAHE3/5A compare to its standoff voltage?
SMAJ9.0CAHE3/5A has a 9.0 V standoff voltage (VWM) and a maximum clamping voltage (VC) of 15.4 V at 26.0 A, yielding a clamping ratio of 1.71. This tight ratio ensures protected circuits experience minimal overvoltage - critical for safeguarding 5 V and 3.3 V ICs whose absolute maximum ratings are often ≤20 V. The low incremental surge resistance contributes to this stable clamping behavior under high-current transients.
What is the peak pulse current rating for SMAJ9.0CAHE3/5A?
SMAJ9.0CAHE3/5A is rated for 26.0 A peak pulse current (IPPM) under the standard 10/1000 μs double-exponential waveform. This value is derived from its 400 W peak pulse power rating and 15.4 V clamping voltage (P = V × I). The device sustains this current without parametric shift or failure when mounted per Vishay's recommended pad layout - enabling compliance with IEC 61000-4-5 Level 4 (4 kV) immunity testing.
Does SMAJ9.0CAHE3/5A require special PCB layout considerations?
Yes - optimal thermal and surge performance requires mounting SMAJ9.0CAHE3/5A on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the datasheet. Smaller pads increase thermal resistance and reduce surge current handling. Additionally, place SMAJ9.0CAHE3/5A as close as possible to the protected interface (e.g., connector or IC pin) with short, wide traces to minimize inductive voltage overshoot during fast transients.
SMAJ9.0CAHE3/5A 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ9.0CAHE3/5A FAQ
1.How can I place an order for SMAJ9.0CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0CAHE3/5A 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 SMAJ9.0CAHE3/5A reliable?
The price and inventory of SMAJ9.0CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0CAHE3/5A?
SMAJ9.0CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0CAHE3/5A 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 SMAJ9.0CAHE3/5A?
For technical support, including SMAJ9.0CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ9.0CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0CAHE3/5A 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 SMAJ9.0CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0CAHE3/5A?
All SMAJ9.0CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0CAHE3/5A, 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 SMAJ9.0CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ9.0CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ9.0CAHE3/5A Tags
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