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Vishay General Semiconductor - Diodes Division SMAJ170CAHE3_A/H
- Part No.:
- SMAJ170CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CAHE3_A/H.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,686
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Product details
Overview
SMAJ170CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 275 V at 1.09 A peak pulse current, with 400 W peak pulse power (10/1000 μs), 170 V stand-off voltage, and ±150 °C operating junction temperature - deployed in automotive sensor signal lines, industrial I/O protection, and telecom interface circuits.
For engineers reviewing the SMAJ170CAHE3_A/H datasheet, SMAJ170CAHE3_A/H pinout, SMAJ170CAHE3_A/H application, or SMAJ170CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 170 V stand-off voltage tolerance, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional conduction enabling suppression of both positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 170 V).
Rated for 400 W peak pulse power below 78 V and 300 W above 78 V (per derating curve), it delivers clamping voltage of 275 V at IPPM = 1.09 A under 10/1000 μs waveform, with typical junction-to-ambient thermal resistance of 120 °C/W and junction-to-lead resistance of 30 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 170 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 170 V nominal systems. |
| Breakdown Voltage (VBR) | 189–209 V at 1 mA - Confirmed minimum/maximum avalanche initiation range; ensures reliable triggering across process variation. |
| Clamping Voltage (VC) | 275 V at IPPM = 1.09 A - Peak voltage seen by protected circuit during worst-case transient; critical for downstream IC survival. |
| Peak Pulse Power (PPPM) | 400 W (≤78 V), 300 W (>78 V) - Energy-handling capacity under standardized 10/1000 μs surge; determines survivability against lightning/inductive spikes. |
| Operating Temperature | -55 °C to +150 °C - Full automotive-grade thermal range; supports under-hood and industrial control cabinet deployment. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with JEDEC-standard reflow profiles and J-STD-020 MSL level 1. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; suffix HE3 denotes qualification. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking; either terminal serves as anode or cathode depending on transient polarity - enables single-component protection of AC or differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) in industrial and automotive interfaces. |
| AEC-Q101 qualified (HE3 suffix) | Validated reliability for automotive ECUs, ADAS sensors, and infotainment systems requiring zero field failure risk. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD or relay bounce), improving system-level immunity. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/FlexRay signal lines 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 entry point to shunt transients before reaching MCU or signal conditioner. Use Value: Maintains signal integrity under 12 V/24 V automotive supply disturbances while meeting AEC-Q101 lifetime requirements. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against inductive switching spikes from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between field wiring and optocoupler/isolation barrier to prevent latch-up or damage to input buffers. Use Value: Enables >100,000 surge cycles at 170 V stand-off without degradation, supporting long-life industrial deployments. |
| Telecom Interface Protection | Consumer Power Adapter ESD Guard |
|
Use Scenario: Shielding Ethernet PHY, RS-485, or DSL line drivers from lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary front-end transient suppressor in multi-stage protection architecture, working with GDTs and current-limiting resistors. Use Value: Clamps to 275 V within nanoseconds, limiting energy delivered to secondary protection stages and preserving data integrity. |
Use Scenario: Adding secondary-level surge immunity to USB-C PD and AC/DC adapter secondary-side outputs exposed to user handling. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) bidirectional clamp ensuring no standby power loss while suppressing ESD events per IEC 61000-4-2. Use Value: Prevents output voltage collapse during 8 kV contact discharge without affecting regulation loop stability or efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170CA-M3 | Halogen-free, RoHS-compliant, commercial-grade; lacks AEC-Q101 qualification and automotive traceability. | Approved for industrial/commercial use only; not suitable for automotive OEM or Tier-1 production. | Select when cost sensitivity outweighs automotive qualification needs and full lifecycle support is not required. |
| SMBJ170CAHE3_A/H | Same electrical specs but SMB (DO-214AA) package - 5.29 mm × 4.60 mm vs. SMA's 4.50 mm × 3.99 mm; 600 W PPPM rating. | Higher power handling and larger pad area; better suited for high-energy surge zones like main power inputs. | Choose when board space allows larger footprint and higher surge margin (600 W) is needed beyond 400 W baseline. |
Compared with SMAJ170CAHE3_A/H, SMAJ170CA-M3 omits automotive qualification and traceability, while SMBJ170CAHE3_A/H trades compactness for 50 % higher surge power in a physically larger package - guiding selection based on qualification mandate and PCB layout constraints.
Availability
SMAJ170CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom interface surge suppression requiring stable component supply, AEC-Q101 compliance, and consistent DO-214AC packaging.
Supply support for SMAJ170CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series targets high-reliability transient suppression in space-constrained surface-mount applications, specifically engineered for automotive, industrial, and telecom systems demanding AEC-Q101 qualification and repeatable clamping performance.
FAQ
What is the clamping voltage of SMAJ170CAHE3_A/H at its rated peak pulse current?
The SMAJ170CAHE3_A/H has a maximum clamping voltage (VC) of 275 V at a peak pulse current (IPPM) of 1.09 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ170CAHE3_A/H suitable for automotive applications?
Yes, SMAJ170CAHE3_A/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation (Rev. 09-Jan-2024, Doc. #88390). It undergoes stress testing for high-temperature operating life, temperature cycling, and ESD robustness - making it appropriate for engine control units, body electronics, and ADAS sensor modules where automotive-grade reliability is mandatory.
What does the "CA" suffix indicate in SMAJ170CAHE3_A/H?
The "CA" suffix in SMAJ170CAHE3_A/H denotes bidirectional configuration: the device provides symmetrical transient suppression for both polarities without requiring orientation during placement. Unlike unidirectional "A" variants, SMAJ170CAHE3_A/H has no cathode band marking and exhibits identical VBR, VC, and leakage characteristics in either direction - ideal for AC-coupled or differential signal lines.
How does the thermal performance of SMAJ170CAHE3_A/H affect PCB layout?
SMAJ170CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, meaning PCB copper pad area directly impacts power dissipation capability. Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power - undersized pads will reduce surge handling and accelerate thermal degradation of the SMAJ170CAHE3_A/H.
What is the maximum reverse leakage current for SMAJ170CAHE3_A/H at its stand-off voltage?
At its 170 V stand-off voltage (VWM), the SMAJ170CAHE3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 μA, measured at TA = 25 °C. This low leakage ensures minimal standby power loss in battery-powered or energy-sensitive applications - verified in Table "ELECTRICAL CHARACTERISTICS" of Vishay document 88390 for all SMAJ170CA variants.
SMAJ170CAHE3_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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 1.09A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ170CAHE3_A/H FAQ
1.How can I place an order for SMAJ170CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CAHE3_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 SMAJ170CAHE3_A/H reliable?
The price and inventory of SMAJ170CAHE3_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 SMAJ170CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ170CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CAHE3_A/H?
SMAJ170CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CAHE3_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 SMAJ170CAHE3_A/H?
For technical support, including SMAJ170CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ170CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ170CAHE3_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 SMAJ170CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ170CAHE3_A/H?
All SMAJ170CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CAHE3_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 SMAJ170CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ170CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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