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Vishay General Semiconductor - Diodes Division SMAJ170CAHM3/H
- Part No.:
- SMAJ170CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CAHM3/H.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
SMAJ170CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power 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 - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ170CAHM3/H datasheet, SMAJ170CAHM3/H pinout, SMAJ170CAHM3/H application, or SMAJ170CAHM3/H equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101 qualified TVS for automotive-grade surge protection where bidirectional clamping, low leakage (<1.09 μA at VWM), and MSL Level 1 reflow compatibility are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced surges, and inductive switching transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the SMA package supports automated SMT placement and meets UL 94 V-0 flammability requirements.
The device delivers 275 V clamping at 1.09 A (10/1000 μs), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature. It is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine) in unidirectional mode - though SMAJ170CAHM3/H itself is bidirectional and thus not rated for forward conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating window for protected circuitry |
| VBR min/max | 189 V / 209 V at 1 mA - guaranteed breakdown range ensuring consistent turn-on threshold under transient stress |
| VC @ IPPM | 275 V at 1.09 A - clamped voltage during 10/1000 μs surge; determines worst-case overvoltage seen by downstream components |
| PPPM | 400 W - peak pulse power handling capability with standard 10/1000 μs waveform; derates to 300 W above 78 V per spec |
| ID @ VWM | <1.09 μA - ultra-low reverse leakage at stand-off voltage, minimizing standby power loss and signal distortion |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - surface-mount package with 5.0 mm × 5.0 mm copper pad thermal layout support and MSL Level 1 rating |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Bidirectional construction means no polarity marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | Both terminals serve identical clamping function; no cathode band marking; enables placement without orientation check |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements (per Vishay HM3 suffix) without compromising surge performance |
| 400 W peak pulse power | Withstands high-energy transients common in 24 V/48 V industrial and vehicle power systems |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without preconditioning - simplifies manufacturing flow |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and CAN node power rails from load dump and jump-start surges in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and ground, responding within <1 ps to limit overvoltage to ≤275 V. Use Value: Prevents latch-up or permanent damage to transceivers during ISO 7637-2 Pulse 5a events, leveraging AEC-Q101 qualification and 150 °C operation. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules exposed to motor drive noise. IC Role / Device Role / Timing Role: Low-leakage (≤1.09 μA) TVS shunting fast transients on 4–20 mA loop lines before they reach precision DACs or op-amps. Use Value: Maintains signal integrity with minimal offset error while clamping 1 kV EFT bursts per IEC 61000-4-4, enabled by 275 V VC and DO-214AC thermal performance. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
|
Use Scenario: Guarding 48 V PoE-powered equipment inputs against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail, coordinated with upstream fuses and secondary-stage polymer PTCs. Use Value: Absorbs 400 W surge energy without degradation, supporting EN 61000-4-5 Level 3 (2 kV line-earth) compliance in compact SMA footprint. |
Use Scenario: Adding secondary-level surge immunity to USB Type-C VBUS lines in portable monitors and docking stations. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) bidirectional clamp limiting VBUS overvoltage during hot-plug ESD or cable discharge events. Use Value: Enables robust 10 kV contact / 15 kV air ESD protection (IEC 61000-4-2) while maintaining <1.09 μA leakage to avoid battery drain in always-on devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial-automotive hybrids where halogen content is unrestricted | Select when cost optimization is prioritized over halogen-free requirement |
| SMBJ170CAHM3 | Same VWM/VC but in larger SMB (DO-214AA) package; 600 W PPPM, higher thermal mass | Better suited for high-repetition surge environments or PCBs with limited thermal relief | Choose when board layout allows larger footprint and higher surge margin is needed |
Compared with SMAJ170CAHM3/H, SMAJ170CAHE3/H offers identical surge performance without halogen-free assurance, while SMBJ170CAHM3 trades compactness for 50 % higher pulse power and improved thermal dissipation - making it preferable for high-duty-cycle industrial applications.
Availability
SMAJ170CAHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer USB-C power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ170CAHM3/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, efficiency, and application-specific validation.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low leakage, and precise clamping are critical.
FAQ
What is the clamping voltage of the SMAJ170CAHM3/H under a 10/1000 μs surge?
The SMAJ170CAHM3/H has a maximum clamping voltage (VC) of 275 V at a peak pulse current (IPPM) of 1.09 A with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ170CAHM3/H maintains this clamping performance across its full operating temperature range and is validated per IEC 61000-4-5 surge immunity requirements.
Is SMAJ170CAHM3/H suitable for automotive applications?
Yes, SMAJ170CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting stringent automotive reliability and environmental standards. It is specified for operation from −55 °C to +150 °C and is commonly deployed in engine control units, body electronics, and ADAS sensor power rails. The SMAJ170CAHM3/H undergoes stress testing including temperature cycling, humidity bias, and mechanical shock per AEC-Q101.
How does the bidirectional design of SMAJ170CAHM3/H affect PCB layout?
The SMAJ170CAHM3/H has no polarity marking and symmetrical terminal functionality, eliminating orientation constraints during placement. This simplifies automated assembly and reduces risk of misorientation-related failures. Layout requires only two 5.0 mm × 5.0 mm copper pads per terminal (per Vishay recommended footprint), with no need for cathode identification or directional routing - unlike unidirectional variants such as SMAJ170A.
What is the maximum leakage current of SMAJ170CAHM3/H at its stand-off voltage?
The SMAJ170CAHM3/H exhibits a maximum reverse leakage current (ID) of 1.09 μA at its 170 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-operated systems. Leakage remains below 5 μA up to +85 °C, as confirmed in Vishay's thermal derating curves.
Does SMAJ170CAHM3/H require special handling during reflow soldering?
No special handling is required beyond standard MSL Level 1 protocols: SMAJ170CAHM3/H is rated for peak reflow temperatures up to 260 °C with no floor life limitation or bake-out requirement. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, ensuring robust wetting and joint reliability in lead-free processes. The SMAJ170CAHM3/H package is fully compatible with standard SMT reflow profiles used for DO-214AC components.
SMAJ170CAHM3/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:
- Discontinued at Digi-Key
- 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:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ170CAHM3/H FAQ
1.How can I place an order for SMAJ170CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CAHM3/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 SMAJ170CAHM3/H reliable?
The price and inventory of SMAJ170CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ170CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CAHM3/H?
SMAJ170CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CAHM3/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 SMAJ170CAHM3/H?
For technical support, including SMAJ170CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CAHM3/H requirements.
6.How does Aetrix verify that SMAJ170CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ170CAHM3/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 SMAJ170CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ170CAHM3/H?
All SMAJ170CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CAHM3/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 SMAJ170CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ170CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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