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Vishay General Semiconductor - Diodes Division SMAJ170AHE3_A/H
- Part No.:
- SMAJ170AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AHE3_A/H.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,635
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Product details
Overview
SMAJ170AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, 275 V maximum clamping voltage (VC) at 1.09 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMAJ170AHE3_A/H datasheet, SMAJ170AHE3_A/H pinout, SMAJ170AHE3_A/H application, or SMAJ170AHE3_A/H equivalent, key selection criteria include verified clamping performance under 1.09 A surge, AEC-Q101 qualification status, SMA (DO-214AC) package thermal resistance (RθJA = 120 °C/W), and unidirectional polarity marking for correct PCB orientation.
Technical Context
This TVS diode operates as a fast-acting shunt protector: when reverse voltage exceeds VBR (189–209 V), it avalanches to clamp transient energy within nanoseconds. Its glass-passivated junction ensures stable leakage (<1.0 μA at 170 V) and low incremental surge resistance, enabling precise voltage limiting without thermal runaway.
Designed for high-reliability environments, SMAJ170AHE3_A/H meets MSL Level 1 per J-STD-020, supports lead-free reflow up to 260 °C peak, and is AEC-Q101 qualified - confirming suitability for automotive under-hood and chassis applications where junction temperature may reach 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 189 V / 209 V at 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | 275 V at 1.09 A - clamped voltage during full-rated 10/1000 μs transient, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling capability with standard lightning/surge waveform |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves system efficiency in high-impedance bias networks |
| TJ max | +150 °C - enables operation in engine bay or industrial enclosures without derating |
| RθJA | 120 °C/W - thermal resistance defines required copper pad area (0.2" × 0.2") for safe 3.3 W dissipation |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, and cathode band marking for unidirectional polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected circuit ground or low-side rail | Must be tied to lowest potential node in protected path to ensure proper clamping direction |
| Cathode | Current exit point in forward bias; marked by band; connected to line under protection | Band orientation on PCB must align with positive rail or signal line to be clamped |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term leakage stability across 10+ year service life |
| MSL Level 1 rating | Enables standard SMT reflow without moisture sensitivity concerns or baking requirements |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without degradation |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during transients, protecting 200 V-rated MOSFETs and gate drivers |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed control modules exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between power input and ground to clamp spikes up to 120 V within <1 ns. Use Value: Prevents latch-up or gate oxide damage in MCU power management ICs by limiting transient voltage to ≤275 V at 1.09 A. | Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed through noisy factory floors with ESD and inductive coupling. IC Role / Device Role / Timing Role: Unidirectional TVS on signal line to ground, absorbing ±8 kV contact ESD (IEC 61000-4-2) and 100 V/m RF-induced transients. Use Value: Maintains sub-μA leakage to avoid offset drift in 24-bit ADC front-ends while clamping to <275 V. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Supply Protection |
Use Scenario: -48 V telecom rectifier outputs feeding switching regulators, subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary TVS on input rail, coordinated with upstream MOVs to handle multi-kA events per IEC 61643-21. Use Value: Withstands 400 W pulses without parameter shift, ensuring sustained protection across 10⁵ surge cycles. | Use Scenario: Isolated gate driver supplies (e.g., for 600 V IGBTs) in variable-frequency drives, vulnerable to Miller-induced transients. IC Role / Device Role / Timing Role: Local TVS on 15 V gate supply rail to suppress >100 V ringing caused by high dV/dt switching. Use Value: Clamps within 1 ns to prevent false turn-on of power devices, preserving PWM fidelity and reducing shoot-through risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/61 | Same electrical specs, RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; not approved for under-hood use per OEM requirements | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation |
| SMAJ170AHM3_A/H | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical clamping and thermal specs | Same automotive use cases; preferred where halogen-free compliance is mandated (e.g., EU automotive Tier 1) | Choose for green manufacturing programs requiring halogen-free materials without sacrificing performance |
Compared with SMAJ170AHE3_A/H, SMAJ170A-E3/61 offers identical protection performance but lacks AEC-Q101 validation for automotive deployment, while SMAJ170AHM3_A/H delivers identical reliability with halogen-free construction - making the HE3 variant optimal for cost-constrained AEC-Q101 applications and HM3 for environmentally regulated vehicle platforms.
Availability
SMAJ170AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power systems requiring stable component supply with full AEC-Q101 traceability and long-lifecycle support.
Supply support for SMAJ170AHE3_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, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ170AHE3_A/H at its rated peak pulse current?
The SMAJ170AHE3_A/H has a maximum clamping voltage (VC) of 275 V at its rated peak pulse current of 1.09 A with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring compatibility with 300 V-rated downstream components. The SMAJ170AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ170AHE3_A/H qualified to AEC-Q101, and what does that mean for automotive use?
Yes, SMAJ170AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed in Vishay's ordering information and device marking ("HE3" suffix). This qualification validates its reliability under automotive environmental stresses including temperature cycling, humidity, mechanical shock, and high-temperature operating life - enabling direct use in engine control units, body electronics, and ADAS power domains without additional qualification testing. The SMAJ170AHE3_A/H meets all stress test requirements defined in the AEC-Q101 standard.
What is the thermal resistance and power dissipation capability of SMAJ170AHE3_A/H?
SMAJ170AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a steady-state power dissipation (PD) rating of 3.3 W at TA = 50 °C on infinite heatsink. When mounted on the recommended 0.2" × 0.2" copper pads per terminal, it safely handles continuous dissipation up to 3.3 W - sufficient for leakage-based heating in high-impedance bias networks. The SMAJ170AHE3_A/H thermal design supports reliable operation up to +150 °C junction temperature.
How does the unidirectional configuration of SMAJ170AHE3_A/H affect its circuit placement?
The unidirectional configuration of SMAJ170AHE3_A/H requires correct polarity alignment: the cathode (marked by a band) must connect to the line being protected (e.g., +170 V rail), and the anode to ground. Reversing polarity prevents clamping during positive transients and risks catastrophic failure under reverse bias. This directional behavior makes SMAJ170AHE3_A/H ideal for DC power rails but unsuitable for AC or bidirectional signal lines - where SMAJ170CA variants would apply. Always verify band orientation during layout.
What packaging and reel options are available for SMAJ170AHE3_A/H?
SMAJ170AHE3_A/H is supplied in 7" diameter plastic tape and reel format with a base quantity of 1800 units per reel (package code "H"). It uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards, and meets JESD 201 Class 2 whisker resistance. The SMAJ170AHE3_A/H reel packaging supports high-speed automated placement and is compatible with standard SMT reflow profiles up to 260 °C peak temperature.
SMAJ170AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ170AHE3_A/H FAQ
1.How can I place an order for SMAJ170AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AHE3_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 SMAJ170AHE3_A/H reliable?
The price and inventory of SMAJ170AHE3_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 SMAJ170AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ170AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AHE3_A/H?
SMAJ170AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AHE3_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 SMAJ170AHE3_A/H?
For technical support, including SMAJ170AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ170AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ170AHE3_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 SMAJ170AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ170AHE3_A/H?
All SMAJ170AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AHE3_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 SMAJ170AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ170AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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