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Vishay General Semiconductor - Diodes Division SMAJ170AHE3_A/I
- Part No.:
- SMAJ170AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AHE3_A/I.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,462
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Product details
Overview
SMAJ170AHE3_A/I from Vishay General Semiconductor is a unidirectional 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 AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SMAJ170AHE3_A/I datasheet, SMAJ170AHE3_A/I pinout, SMAJ170AHE3_A/I application, or SMAJ170AHE3_A/I equivalent, this device is selected for robust overvoltage protection on power rails and signal lines where fast response (<1 ns), low clamping ratio (VC/VWM = 1.62), and automotive-grade reliability are required.
Technical Context
This unidirectional TVS operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown above its 189–209 V breakdown range (IT = 1 mA). It delivers 400 W peak pulse power per 10/1000 μs waveform at TA = 25 °C, derating to 300 W above 78 V, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W.
Its glass-passivated junction ensures stable leakage performance (ID ≤ 1.0 μA at 170 V), fast response time (<1 ns), and low incremental surge resistance - critical for protecting MOSFET gates, microcontroller I/O, and automotive sensor interfaces against ESD, load dump, and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| Breakdown Voltage (VBR) | 189–209 V at 1 mA - Confirmed avalanche threshold range; ensures predictable turn-on under transient stress. |
| Clamping Voltage (VC) | 275 V at IPPM = 1.09 A - Peak voltage seen by protected circuit during 10/1000 μs surge; clamping ratio = 1.62. |
| Peak Pulse Power (PPPM) | 400 W (≤78 V), 300 W (>78 V) - Sustained surge energy handling per JEDEC standard; validated on 5 mm × 5 mm copper pads. |
| Leakage Current (ID) | ≤1.0 μA at 170 V - Minimal parasitic loading on high-impedance signal/power paths at rated VWM. |
| Operating Temperature | −55 °C to +150 °C - Full automotive-grade junction temperature range; supports under-hood and infotainment applications. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during reverse transient. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail or CAN-H); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without derating on standard PCB layouts. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive use including temperature cycling, humidity bias, and high-temperature reverse bias life testing. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on downstream ICs such as MCUs and transceivers during fast transients. |
| Fast response time (<1 ns) | Clamps before sensitive components experience damaging overvoltage; critical for protecting high-speed interfaces. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) and jump-start spikes on 12 V/24 V vehicle power distribution networks. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and power management IC input. Use Value: Limits voltage to ≤275 V during 1.09 A surge, preventing damage to buck controllers and PMICs while maintaining AEC-Q101 compliance. |
Use Scenario: Protecting analog outputs and digital I/O of pressure, temperature, and position sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Standoff-clamp TVS on sensor supply and signal lines exposed to relay coil back-EMF and EFT bursts. Use Value: Sub-μA leakage preserves signal integrity; 275 V clamping prevents latch-up in 3.3 V/5 V ADC front-ends during 4 kV EFT events. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
|
Use Scenario: Safeguarding primary-side controller ICs and rectifier bridges in AC/DC adapters subjected to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Secondary-side TVS across bulk capacitor or post-rectifier DC bus to absorb residual differential-mode transients. Use Value: 400 W rating handles repetitive 10/1000 μs surges; 170 V VWM allows use with 150 V-rated capacitors and 130 V nominal DC bus designs. |
Use Scenario: Clamping induced surges on −48 V DC telecom power feeds entering base station equipment cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-rail to clamp positive-going transients on negative-grounded systems. Use Value: 150 °C max junction temperature supports operation in sealed outdoor enclosures; RoHS-compliant HE3 suffix meets Telcordia GR-1089-CORE requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/61 | Same electrical specs, commercial-grade (non-AEC-Q101), E3 suffix (RoHS-compliant, no halogen restriction). | Lacks automotive qualification; suitable for industrial/commercial power supplies and consumer electronics. | Select when AEC-Q101 is not required and cost optimization is prioritized over automotive validation. |
| SMAJ170AHM3_A/I | Identical ratings and AEC-Q101 qualification, but HM3 suffix denotes halogen-free construction (per IEC 61249-2-21). | Required for halogen-free BOM compliance in EU automotive Tier 1 programs and green manufacturing initiatives. | Choose when halogen-free material compliance is mandated, with no trade-off in electrical or thermal performance. |
Compared with SMAJ170AHE3_A/I, the E3 variant offers identical protection performance without automotive qualification, while the HM3 variant adds halogen-free compliance-both retain the same 170 V VWM, 275 V VC, and SMA package, enabling direct substitution where qualification scope permits.
Availability
SMAJ170AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power feed applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ170AHE3_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, rectifiers, TVS, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and application-specific design.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness, fast response, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ170AHE3_A/I at its rated peak pulse current?
The SMAJ170AHE3_A/I has a maximum clamping voltage (VC) of 275 V at its specified peak pulse current (IPPM) of 1.09 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and reflects the actual voltage imposed on the protected circuit during surge conditions, ensuring downstream components remain within safe operating limits.
Is SMAJ170AHE3_A/I suitable for automotive applications?
Yes, SMAJ170AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and humidity bias-to meet automotive reliability requirements for engine control units, body electronics, and ADAS power domains.
What does the "HE3" suffix indicate in SMAJ170AHE3_A/I?
The "HE3" suffix in SMAJ170AHE3_A/I denotes RoHS-compliant construction with AEC-Q101 qualification. "H" indicates automotive grade, "E3" specifies lead-free, RoHS-compliant plating and packaging, and the full suffix confirms compliance with both environmental and automotive reliability standards per Vishay's ordering nomenclature.
How does SMAJ170AHE3_A/I differ from SMAJ170A-E3/61?
SMAJ170AHE3_A/I and SMAJ170A-E3/61 share identical electrical parameters (VWM = 170 V, VC = 275 V, PPPM = 400 W), but SMAJ170AHE3_A/I carries AEC-Q101 qualification and uses the HE3 suffix, whereas SMAJ170A-E3/61 is commercial-grade only. The former is intended for automotive use; the latter suits industrial or consumer applications where qualification is not required.
What PCB layout guidance applies to SMAJ170AHE3_A/I for optimal thermal performance?
For optimal thermal performance, SMAJ170AHE3_A/I should be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This pad area ensures effective heat dissipation given its RθJA of 120 °C/W and supports reliable operation at its 3.3 W steady-state power dissipation limit under TA = 50 °C conditions.
SMAJ170AHE3_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:
- 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/I FAQ
1.How can I place an order for SMAJ170AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AHE3_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 SMAJ170AHE3_A/I reliable?
The price and inventory of SMAJ170AHE3_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 SMAJ170AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ170AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AHE3_A/I?
SMAJ170AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AHE3_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 SMAJ170AHE3_A/I?
For technical support, including SMAJ170AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ170AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ170AHE3_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 SMAJ170AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ170AHE3_A/I?
All SMAJ170AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AHE3_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 SMAJ170AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ170AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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