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Diodes Incorporated SMAJ170CA-13
- Part No.:
- SMAJ170CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CA-13.pdf
- Description:
- TVS DIODE 170VWM 275VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
SMAJ170CA-13 from Diodes Incorporated is a bi-directional 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) at 1mA, 275V maximum clamping voltage (VC) at 1.4A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature.
For engineers reviewing the SMAJ170CA-13 datasheet, SMAJ170CA-13 pinout, SMAJ170CA-13 application, or SMAJ170CA-13 equivalent, key selection criteria include clamping performance under 8.3ms surge waveforms, bidirectional polarity tolerance, RoHS-compliant lead-free packaging, and compatibility with automated SMT assembly on PCBs handling industrial power rail transients.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junction construction to achieve fast response time (<1ps) and stable clamping across temperature. Its symmetrical I-V characteristics enable suppression of both positive and negative transients without polarity dependency.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when applied with proper PCB layout. Clamping behavior is validated under 8.3ms half-sine waveform per JEDEC JESD22-A114, with derating above 25°C ambient per Fig. 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge events without failure under defined test conditions |
| Reverse Standoff Voltage (VRWM) | 170V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 189–209V @ 1mA - guaranteed conduction onset range for reliable overvoltage triggering |
| Max Clamping Voltage (VC) | 275V @ IPP = 1.4A - upper limit of voltage seen by protected circuit during specified surge |
| Peak Pulse Current (IPP) | 1.4A - maximum non-repetitive surge current the device can safely divert at VRWM |
| Junction Temperature Range | –55°C to +150°C - supports operation in automotive engine bays and industrial control enclosures |
| Package | SMA (DO-214AC) - industry-standard 2-pin surface-mount outline with 4.80–5.59mm body length |
Pinout & Package
SMAJ170CA-13 is housed in the SMA (DO-214AC) package: molded plastic case, UL 94V-0 rated, cathode band omitted due to bi-directional symmetry. Terminals are solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Either terminal accepts bidirectional surge current; no polarity assignment required in layout |
| Cathode Band (absent) | Polarity indicator | Omitted per datasheet Note 5 - confirms bi-directional functionality; no orientation constraint during placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR and low leakage (<5µA @ VRWM) across temperature and lifetime |
| 400W peak pulse rating | Provides robust protection against IEC 61000-4-4 EFT bursts up to ±2kV on 50Ω source impedance |
| Bi-directional configuration | Eliminates need for polarity-aware routing in AC-coupled or floating signal lines (e.g., RS-485, CAN FD) |
| Lead-free / RoHS compliant | Matte tin finish meets EU Directive Annex exemptions; compatible with Pb-free reflow profiles (J-STD-020C Level 1) |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24V DC power rail in programmable logic controllers exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC/DC converters and microcontroller power supplies. Use Value: Limits transient excursions to ≤275V, preventing damage to 3.3V/5V LDOs and MCU I/O pins rated for 36V absolute max. |
Use Scenario: LIN bus interface and sensor supply lines subject to ISO 7637-2 Pulse 1, 2a, and 5a. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on 12V battery-fed circuits where polarity reversal may occur during jump-start or fault conditions. Use Value: Withstands 100V reverse surge pulses while maintaining <5µA leakage at 170V, ensuring low standby current in always-on modules. |
| RS-485 Data Line Protection | Smart Meter Communication Interface |
Use Scenario: Full-duplex RS-485 transceivers connected to long outdoor cables susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Line-side TVS placed differential-mode between A/B lines and common-mode to ground. Use Value: Symmetric clamping ensures equal protection on both polarities; 275V VC prevents transceiver latch-up during ±1kV ESD contact discharge. |
Use Scenario: PLC or RF communication ports in utility smart meters operating in electrically noisy substations. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy from fast-rising transients. Use Value: 400W rating enables handling of multiple 10/1000µs surges without degradation; 1.4A IPP aligns with IEC 61000-4-5 Level 3 (2kV) 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 |
|---|---|---|---|
| SMBJ170CA-13 | Same VRWM/VBR/VC specs but SMB package (larger footprint, 6.2mm x 3.6mm vs SMA's 4.6mm x 2.9mm); 600W PPK rating | Better thermal dissipation for high-duty-cycle surges; requires larger PCB area | Select when board space permits and higher single-pulse energy handling is needed |
| SMCJ170CA-13 | Same electrical specs in SMC package (7.1mm x 6.2mm); 1500W PPK rating; higher thermal mass | Used in primary protection stages with GDT coordination; suited for harsher environments (e.g., railway) | Choose for mission-critical infrastructure where >1000W surge margin is mandated |
Compared with SMBJ170CA-13 and SMCJ170CA-13, SMAJ170CA-13 offers optimal balance of compact size, 400W capability, and cost for secondary-level protection in space-constrained industrial and automotive modules.
Availability
SMAJ170CA-13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, RS-485 data line protection, and smart meter communication interfaces requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMAJ170CA-13 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 North America.
SMAJxxxA series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications equipment.
FAQ
What is the maximum clamping voltage of SMAJ170CA-13 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 JEDEC JESD22-A114. This value represents the upper voltage limit imposed on protected circuitry during standardized surge testing.
Is SMAJ170CA-13 unidirectional or bi-directional, and how is this indicated in the part marking?
SMAJ170CA-13 is bi-directional, confirmed by the "C" suffix in the part number per datasheet Note 5. Unlike unidirectional variants, it has no cathode band marking-its symmetrical construction allows installation without polarity orientation constraints.
Can SMAJ170CA-13 be used in place of SMAJ170A-13, and what is the functional difference?
No-it cannot be substituted directly. SMAJ170A-13 is unidirectional with cathode band marking and forward conduction capability; SMAJ170CA-13 is bi-directional with symmetric clamping and no polarity indicator. Using the wrong type risks incorrect surge handling in DC-biased circuits.
What is the steady-state power dissipation rating and thermal derating behavior of SMAJ170CA-13?
Steady-state power dissipation is 1.0W at TL = 75°C. Derating follows Fig. 6 in the datasheet: power drops linearly to zero at 175°C lead temperature. At 125°C, allowable PM(AV) is approximately 0.5W, requiring thermal relief pads or airflow in high-ambient designs.
SMAJ170CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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):
- 1.4A
- 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
SMAJ170CA-13 FAQ
1.How can I place an order for SMAJ170CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CA-13 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 SMAJ170CA-13 reliable?
The price and inventory of SMAJ170CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ170CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CA-13?
SMAJ170CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CA-13 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 SMAJ170CA-13?
For technical support, including SMAJ170CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CA-13 requirements.
6.How does Aetrix verify that SMAJ170CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ170CA-13 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 SMAJ170CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ170CA-13?
All SMAJ170CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CA-13, 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 SMAJ170CA-13 part is unused and in its original packaging.
Return procedure for SMAJ170CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170CA-13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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