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Vishay General Semiconductor - Diodes Division SMAJ17CAHE3_A/H
- Part No.:
- SMAJ17CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CAHE3_A/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,850
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Product details
Overview
SMAJ17CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, with 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, and 400 W peak pulse power (10/1000 μs). It clamps transients to ≤27.6 V at 14.5 A peak surge current and operates from −55 °C to +150 °C, protecting MOSFETs and sensor signal lines in automotive ECUs.
For engineers reviewing the SMAJ17CAHE3_A/H datasheet, SMAJ17CAHE3_A/H pinout, SMAJ17CAHE3_A/H application, or SMAJ17CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 17 V stand-off rating, low clamping ratio (VC/VWM ≈ 1.62), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device functions as a voltage-clamping protection element placed across sensitive inputs or power rails. Its bidirectional architecture enables symmetrical suppression of positive and negative transients without polarity sensitivity, making it suitable for AC-coupled or floating signal paths. The glass-passivated junction ensures stable leakage (<1 μA at VWM) and repeatable breakdown behavior under repetitive surge conditions.
Designed for high-energy transient immunity per IEC 61000-4-5 (indirect lightning) and ISO 7637-2 (automotive load dump), it delivers 400 W peak pulse power below 78 V and maintains <30 °C/W junction-to-lead thermal resistance. Its MSL Level 1 rating supports lead-free reflow up to 260 °C without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin for protected circuitry. |
| VBR min/max | 18.9 V / 20.9 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on within ±5.5% tolerance at rated test current. |
| VC @ IPPM | 27.6 V at 14.5 A - Clamped voltage during 10/1000 μs surge; limits downstream stress to ≤1.62× VWM. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs waveform); supports robust protection against inductive switching spikes. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates unidirectional surge resilience despite bidirectional function. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2″ × 0.2″ copper pads; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 2.92 mm × 2.29 mm (L × W × H), matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical PN junction; conducts during negative surges relative to cathode reference. |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical PN junction; conducts during positive surges; no band marking on bidirectional units. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| 400 W peak pulse power (10/1000 μs) | Supports EN 61000-4-5 Level 4 immunity (4 kV line-to-earth) without external series impedance in many board-level designs. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to downstream ICs-critical for 3.3 V or 5 V logic interfacing with 12 V/24 V systems. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable leakage current (<1 μA at 17 V) and long-term parameter stability under thermal and humidity stress. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller GPIOs from load-dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly across LIN data line and ground, responding in <1 ns to limit excursion to ≤27.6 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V transceivers during 100 V/50 ms load dump events per ISO 7637-2 Pulse 5a. | Use Scenario: Shields analog output pins of 4–20 mA current-loop sensors from ESD and inductive kickback in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional clamping element between signal line and return path, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity by limiting transient overshoot to <28 V while adding <0.5 pF capacitance at 1 MHz-negligible for DC/low-frequency loops. |
| Telecom Power Interface Protection | Consumer USB-C Port ESD Suppression |
Use Scenario: Safeguards PoE-powered Ethernet PHY interfaces against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary clamping device on 48 V DC input rail, coordinated with upstream fuse and secondary filtering. Use Value: Handles 400 W surge energy without degradation, enabling compliance with IEC 61000-4-5 Ed. 3 (2 kV line-to-ground) in Class A equipment. | Use Scenario: Integrated into USB-C receptacle ESD protection network for VBUS and CC lines in portable chargers and docks. IC Role / Device Role / Timing Role: Secondary-level TVS after polymer PTC, providing fast clamping (<1 ns) for ±15 kV air discharge events. Use Value: AEC-Q101 qualification ensures reliability across thermal cycles in consumer devices; low leakage avoids standby current drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; differs only in molding compound chemistry. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMAJ17CAHE3_A/H for standard RoHS; select SMAJ17CA-M3/61 only if halogen-free certification is contractually required. |
| SMBJ17CAHE3_A/H | Same VWM, VBR, and VC, but higher 600 W PPPM; larger SMB (DO-214AA) package (4.57 mm × 3.94 mm). | Higher surge margin suits harsher environments (e.g., commercial vehicle alternator ripple), but requires PCB layout change. | Use SMAJ17CAHE3_A/H where space-constrained SMT placement is critical; upgrade to SMBJ17CAHE3_A/H only when >400 W surge headroom is verified necessary. |
Compared with SMAJ17CA-M3/61, SMAJ17CAHE3_A/H offers identical protection performance with standard RoHS compliance; versus SMBJ17CAHE3_A/H, it trades 200 W pulse power for 30% smaller footprint-enabling denser routing in compact automotive modules.
Availability
SMAJ17CAHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom power inputs, and consumer USB-C port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ17CAHE3_A/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, power efficiency, and automotive qualification.
The SMAJ series is engineered for high-reliability transient suppression in space-constrained, thermally demanding applications-including under-hood automotive, industrial control, and infrastructure equipment-where consistent clamping and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ17CAHE3_A/H during a 10/1000 μs surge event?
The SMAJ17CAHE3_A/H clamps to a maximum of 27.6 V at its rated peak pulse current of 14.5 A under a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C) and reflects worst-case device behavior across process variation. The clamping voltage remains stable across temperature due to the device's low VBR temperature coefficient (0.090 %/°C), ensuring predictable protection in automotive under-hood environments where SMAJ17CAHE3_A/H is commonly deployed.
Is the SMAJ17CAHE3_A/H suitable for bidirectional signal line protection?
Yes, the SMAJ17CAHE3_A/H is explicitly designed for bidirectional transient suppression, as indicated by the "CA" suffix and confirmed in Vishay's datasheet. It provides symmetrical clamping for both positive- and negative-polarity transients without polarity marking on the SMA package. Its breakdown voltage range (18.9–20.9 V) and clamping behavior apply identically in either direction, making SMAJ17CAHE3_A/H ideal for protecting AC-coupled interfaces, differential buses like LIN or CAN FD physical layers, and floating sensor outputs where polarity cannot be assumed.
Does the SMAJ17CAHE3_A/H meet automotive qualification standards?
Yes, the SMAJ17CAHE3_A/H is AEC-Q101 qualified, as stated in the Vishay datasheet revision 09-Jan-2024 (Document Number: 88390). This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing (uHAST), validating its suitability for automotive applications such as body control modules, infotainment power supplies, and ADAS sensor interfaces. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, confirming that SMAJ17CAHE3_A/H meets the reliability requirements for automotive-grade deployment.
What is the thermal resistance from junction to ambient for the SMAJ17CAHE3_A/H?
The typical junction-to-ambient thermal resistance (RθJA) of the SMAJ17CAHE3_A/H is 120 °C/W when mounted on the recommended minimum pad layout (0.2″ × 0.2″ copper pads per terminal). This value assumes natural convection cooling and is critical for derating power dissipation above 25 °C ambient. For example, at 85 °C ambient, the device's safe continuous power drops to approximately 2.0 W. Engineers must verify PCB copper area and airflow in their actual layout, as RθJA degrades significantly with reduced copper; SMAJ17CAHE3_A/H's RθJL of 30 °C/W supports localized thermal relief via thermal vias to inner ground planes.
How does the SMAJ17CAHE3_A/H compare to unidirectional variants like SMAJ17AHE3_A/H?
The SMAJ17CAHE3_A/H differs from unidirectional SMAJ17AHE3_A/H solely in polarity configuration: SMAJ17CAHE3_A/H suppresses transients in both directions with no cathode band, while SMAJ17AHE3_A/H has a marked cathode and only protects against reverse-biased surges. Electrically, both share identical VWM (17 V), VBR, and VC ratings. However, SMAJ17CAHE3_A/H is required for AC or floating nodes (e.g., RS-485 lines), whereas SMAJ17AHE3_A/H suffices for DC rails with known polarity. Substituting one for the other without verifying circuit topology may result in failed protection-always confirm signal polarity before selecting SMAJ17CAHE3_A/H or its unidirectional counterpart.
SMAJ17CAHE3_A/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:
- 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/H FAQ
1.How can I place an order for SMAJ17CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/H reliable?
The price and inventory of SMAJ17CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ17CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CAHE3_A/H?
SMAJ17CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/H?
For technical support, including SMAJ17CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ17CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ17CAHE3_A/H?
All SMAJ17CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CAHE3_A/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 SMAJ17CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ17CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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