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Diodes Incorporated SMAJ170A-13-F
- Part No.:
- SMAJ170A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170A-13-F.pdf
- Description:
- TVS DIODE 170VWM 275VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,865
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Product details
Overview
SMAJ170A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal interfaces. It features a 170V reverse standoff voltage (VRWM), 189–209V breakdown voltage (VBR), 275V maximum clamping voltage (VC) at 1.4A peak pulse current (IPP), and SMA package with cathode band polarity indicator.
For engineers reviewing the SMAJ170A-13-F datasheet, SMAJ170A-13-F pinout, SMAJ170A-13-F application, or SMAJ170A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, thermal derating above +25°C, unidirectional polarity handling, and compatibility with automated SMT assembly on industrial and automotive PCBs.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, responding within picoseconds to transients exceeding VRWM and diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable VBR and low leakage (<5µA at VRWM), while the SMA package supports 1.0W steady-state dissipation at TL = +75°C.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when applied per layout guidelines. It is rated for operation from –55°C to +150°C junction temperature and exhibits no polarity marking ambiguity-cathode band clearly identifies anode/cathode orientation in unidirectional configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surge without failure under defined thermal conditions |
| Reverse Standoff Voltage (VRWM) | 170V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 189–209V @ IT = 1.0mA - defines onset of avalanche conduction; tight tolerance enables predictable clamping threshold |
| Max Clamping Voltage (VC) | 275V @ IPP = 1.4A - upper limit of voltage seen by protected load during specified transient event |
| Peak Pulse Current (IPP) | 1.4A - maximum non-repetitive surge current the device can safely clamp at VC |
| Junction Temperature Range | –55°C to +150°C - validated operating envelope for automotive and industrial ambient environments |
| Package | SMA (DO-214AC) - standardized surface-mount outline with 4.0–4.6mm body width and 2.29–2.92mm height for reliable reflow soldering |
Pinout & Package
The SMAJ170A-13-F uses the standard SMA (DO-214AC) surface-mount package: molded plastic case (UL 94V-0), matte tin-plated terminals, cathode band marking on top surface, and 0.064g typical weight. Moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Reference terminal for unidirectional clamping | Connected to system ground or low-side return path; clamps positive transients to ground |
| Cathode (Opposite Cathode Band) | High-impedance input terminal | Connected to protected line (e.g., 170V rail); conducts only when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 3 surges (1kV/2Ω) on medium-voltage DC buses |
| Glass Passivated Die | Ensures long-term VBR stability and low parametric drift across temperature and life cycles |
| Lead-Free & RoHS 3 Compliant | Meets EU Directive 2015/863/EU with <900ppm Br, <900ppm Cl, <1000ppm Sb - suitable for green manufacturing |
| Fast Response Time | Sub-nanosecond turn-on enables clamping before sensitive downstream components experience overstress |
| Unidirectional Polarity | Eliminates risk of reverse-bias conduction in DC-coupled applications; cathode band ensures correct orientation during placement |
Applications
| Industrial Motor Drive DC Bus | Automotive HVAC Control Module |
|---|---|
|
Use Scenario: Protection of 170V-rated DC link capacitors and gate drivers against switching-induced voltage spikes and load dump transients. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed directly across bus rails to limit transient overvoltage to ≤275V during 1.4A surge events. Use Value: Prevents catastrophic failure of IGBT modules and electrolytic capacitors by limiting peak stress below their rated voltage margin. |
Use Scenario: Surge suppression on 12V–24V auxiliary power inputs feeding microcontroller-based HVAC control boards in passenger compartments. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, activated only during positive-going transients (e.g., ISO 7637-2 Pulse 1/2a). Use Value: Maintains MCU reset integrity and sensor accuracy by holding supply rail within ±5% of nominal during 100ns–100ms transients. |
| Telecom Remote Radio Unit (RRU) | Renewable Energy Inverter DC Input |
|
Use Scenario: Protection of PoE-powered RF front-end ICs and bias supplies exposed to lightning-induced surges on outdoor fiber/ethernet links. IC Role / Device Role / Timing Role: First-line transient suppressor on 48V DC input, placed upstream of DC-DC converters and LDOs. Use Value: Reduces need for secondary clamping stages by absorbing >95% of 400W surge energy before downstream regulation stages. |
Use Scenario: Overvoltage safeguard on photovoltaic string inputs (up to 170V open-circuit) subject to rapid cloud-edge transients and grid-switching events. IC Role / Device Role / Timing Role: Unidirectional TVS connected between PV+ and ground, sized to clamp at 275V before MPPT controller overvoltage lockout triggers. Use Value: Extends inverter uptime by preventing nuisance shutdowns and enabling continued power harvesting during transient excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/5A (Vishay) | Identical VRWM (170V), VBR (189–209V), VC (275V), but rated for 1.5A IPP and packaged in tape-and-reel with different carrier specs | Same clamping behavior; differs in moisture sensitivity level (MSL 1 vs MSL 2a) and lead finish (SnPb optional) | Select when requiring Vishay's AEC-Q200 qualified variants or alternate packaging logistics |
| P6SMB170A (ON Semiconductor) | Same SMA package and electrical ratings, but higher max leakage (10µA vs 5µA) and slightly wider VBR tolerance (185–215V) | Acceptable for non-critical industrial use; not recommended where low IR is required for high-impedance sensing nodes | Choose for cost-sensitive designs where tighter leakage spec is not mandatory |
Compared with SMAJ170A-13-F, the Vishay alternative offers identical clamping performance with enhanced surge margin (+0.1A IPP), while the ON Semiconductor part trades leakage and VBR precision for broader availability and lower unit cost in non-automotive contexts.
Availability
SMAJ170A-13-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive HVAC modules, telecom remote radio units, and renewable energy inverter DC inputs requiring stable component supply across extended production lifecycles.
Supply support for SMAJ170A-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC power line protection in automotive, industrial, and telecom infrastructure where precise clamping and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of SMAJ170A-13-F and under what test condition is it specified?
The maximum clamping voltage is 275V, measured at a peak pulse current (IPP) of 1.4A using an 8.3ms single half-sine waveform per IEC 61000-4-5. This value represents the highest voltage that will appear across the protected circuit during that specific surge event, assuming proper PCB layout and thermal management.
Can SMAJ170A-13-F be used in bidirectional applications?
No - SMAJ170A-13-F is a unidirectional TVS diode, indicated by the absence of the "C" suffix. Bidirectional operation requires the "C" variant (e.g., SMAJ170CA-13-F), which has symmetrical clamping in both polarities and no cathode band marking. Using the unidirectional version in AC-coupled or bipolar signal paths may result in forward conduction and failure.
What is the thermal derating behavior above +25°C ambient?
Peak pulse power derates linearly from 100% at +25°C to approximately 50% at +100°C, per Figure 1 in DS19005 Rev. 19-2. Steady-state power dissipation also decreases from 1.0W at TL = +75°C to zero at TJ = +150°C, following the curve in Figure 6. Derating must be applied based on actual lead or junction temperature, not ambient alone.
Is SMAJ170A-13-F qualified for automotive applications?
The standard SMAJ170A-13-F is not AEC-Q200 qualified. Diodes offers an automotive-compliant version under separate datasheet (SMAJ170AQ-13-F), manufactured in IATF 16949-certified facilities and PPAP-capable. For automotive use, the "Q" suffix part must be specified; the standard part is intended for industrial and commercial applications.
SMAJ170A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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):
- 1.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ170A-13-F FAQ
1.How can I place an order for SMAJ170A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170A-13-F 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 SMAJ170A-13-F reliable?
The price and inventory of SMAJ170A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ170A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170A-13-F?
SMAJ170A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170A-13-F 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 SMAJ170A-13-F?
For technical support, including SMAJ170A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170A-13-F requirements.
6.How does Aetrix verify that SMAJ170A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ170A-13-F 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 SMAJ170A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ170A-13-F?
All SMAJ170A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170A-13-F, 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 SMAJ170A-13-F part is unused and in its original packaging.
Return procedure for SMAJ170A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170A-13-F Tags
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