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Vishay General Semiconductor - Diodes Division SMAJ17CAHE3_A/I
- Part No.:
- SMAJ17CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CAHE3_A/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,991
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Product details
Overview
SMAJ17CAHE3_A/I 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 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), and clamps transients to ≤27.6 V at 14.5 A IPPM - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ17CAHE3_A/I datasheet, SMAJ17CAHE3_A/I pinout, SMAJ17CAHE3_A/I application, or SMAJ17CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at VWM), while the low RθJA (120 °C/W) supports thermal reliability under repetitive surge conditions.
The device meets UL 497B recognition (QVGQ2) and is rated for 40 A IFSM (8.3 ms half-sine), making it suitable for high-energy inductive switching events. Its MSL Level 1 rating (260 °C peak reflow) and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected lines. |
| VBR min/max | 18.9 V / 20.9 V at 1 mA - tight breakdown window ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 27.6 V at 14.5 A - clamping voltage limits downstream IC stress during 10/1000 μs surges. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak surge energy handling per JEDEC standard waveform. |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with high-volume pick-and-place assembly. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (one direction) | Accepts positive-going surge relative to cathode; symmetrical with cathode in bidirectional mode. |
| Cathode | Transient current entry (opposite direction) | Accepts negative-going surge relative to anode; functionally identical to anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 0.2" × 0.2" copper pads. |
| Glass passivated junction | Ensures long-term VBR stability and low parameter drift across temperature and lifetime. |
| MSL Level 1 | Supports lead-free reflow up to 260 °C peak without moisture-induced failure. |
| UL 497B recognized | Approved for telecom and industrial surge protector designs requiring safety certification. |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface to shunt surge energy before reaching PHY layer. Use Value: Limits transient voltage to ≤27.6 V, preventing latch-up or gate oxide damage in 3.3 V/5 V automotive MCUs and transceivers. |
Use Scenario: Safeguarding PLC digital input channels exposed to 24 V DC field wiring with inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or optocoupler input side, operating in parallel with series current-limiting resistor. Use Value: Absorbs 400 W surge energy without degradation, maintaining <1.0 μA leakage to ensure clean logic-level detection. |
| Telecom Line Interface | Consumer USB/Display Port ESD |
|
Use Scenario: Shielding RS-485/RS-232 transceiver pins against lightning-induced surges in outdoor base stations and network equipment. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) voltage clamp on differential pair lines, placed adjacent to connector. Use Value: Clamps 10/1000 μs surges to 27.6 V while adding <0.5 pF junction capacitance - minimal signal distortion at 10 Mbps. |
Use Scenario: Board-level ESD protection for USB 2.0 data lines and HDMI/DisplayPort auxiliary channels in laptops and monitors. IC Role / Device Role / Timing Role: Secondary protection stage after connector-level gas discharge tube, absorbing residual ±15 kV HBM events. Use Value: AEC-Q101 qualification ensures reliability in portable electronics subjected to repeated thermal cycling and mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CA-M3 | Halogen-free, RoHS-compliant, non-AEC-Q101; identical electrical specs and package. | Targeted at commercial/industrial systems where automotive qualification is not required. | Select when halogen-free compliance is mandatory and AEC-Q101 is unnecessary. |
| SMBJ17CAHE3_A/I | Same VWM/VBR/VC specs but SMB (DO-214AA) package - 2.5 mm wider body, higher thermal mass (RθJA = 90 °C/W). | Better suited for higher average power dissipation or less dense PCB layouts. | Choose when board space allows larger footprint and improved thermal performance is needed. |
Compared with SMAJ17CAHE3_A/I, SMAJ17CA-M3 offers identical protection performance without automotive qualification, while SMBJ17CAHE3_A/I delivers lower thermal resistance in a larger package - enabling longer surge duty cycles or higher ambient temperatures.
Availability
SMAJ17CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, AEC-Q101 traceability, and consistent surge performance across production lots.
Supply support for SMAJ17CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific validation.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for fast response, low clamping, and robust surge endurance in harsh environments.
FAQ
What does the "CA" suffix indicate in SMAJ17CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ17CAHE3_A/I provides symmetrical clamping for both positive and negative transients. Unlike unidirectional "A" variants, it has no cathode marking and functions identically in either polarity - essential for protecting AC-coupled or differential signal lines such as RS-485 or CAN bus without polarity concerns.
Is SMAJ17CAHE3_A/I suitable for automotive applications?
Yes, SMAJ17CAHE3_A/I is AEC-Q101 qualified, verified for use in automotive environments including powertrain, chassis, and ADAS subsystems. Its 150 °C maximum junction temperature, MSL Level 1 reflow rating, and UL 497B recognition support deployment in engine control units, sensor hubs, and infotainment interfaces subject to rigorous thermal and surge stress.
What is the clamping voltage of SMAJ17CAHE3_A/I at rated surge current?
SMAJ17CAHE3_A/I clamps to a maximum of 27.6 V at its rated peak pulse current (IPPM) of 14.5 A under a 10/1000 μs waveform. This value is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards and ensures downstream 3.3 V or 5 V ICs remain within safe operating voltage margins during surge events.
How does the SMA (DO-214AC) package of SMAJ17CAHE3_A/I compare to SMB (DO-214AA)?
The SMA package of SMAJ17CAHE3_A/I measures 4.50 mm × 2.79 mm with 120 °C/W junction-to-ambient thermal resistance, offering compact size for dense layouts. In contrast, SMB packages (e.g., SMBJ17CAHE3_A/I) are wider (6.22 mm × 3.56 mm) and provide lower RθJA (90 °C/W), better suited for higher average power dissipation or elevated ambient temperatures.
Does SMAJ17CAHE3_A/I require external current limiting in circuit design?
No, SMAJ17CAHE3_A/I does not require external current limiting for transient suppression - it operates as a voltage-clamping device that self-limits surge current based on system impedance. However, a series current-limiting resistor is recommended upstream to manage steady-state power dissipation during sustained overvoltage, especially when used in conjunction with low-impedance sources like 24 V industrial rails.
SMAJ17CAHE3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17CAHE3_A/I FAQ
1.How can I place an order for SMAJ17CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/I reliable?
The price and inventory of SMAJ17CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ17CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CAHE3_A/I?
SMAJ17CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/I?
For technical support, including SMAJ17CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ17CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ17CAHE3_A/I?
All SMAJ17CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ17CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17CAHE3_A/I Tags
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