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Vishay General Semiconductor - Diodes Division SMAJ170CA-M3/61
- Part No.:
- SMAJ170CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CA-M3/61.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ170CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount 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), 275 V maximum clamping voltage at 1.09 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ170CA-M3/61 datasheet, SMAJ170CA-M3/61 pinout, SMAJ170CA-M3/61 application, or SMAJ170CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, 170 V reverse stand-off rating, low leakage (<1.09 μA at VWM), AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamping device across two terminals, responding to transient overvoltages in either polarity due to its symmetrical bidirectional structure. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the low incremental surge resistance minimizes voltage overshoot during high-current surges.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Vishay's Fig. 2 curve. Thermal resistance is 120 °C/W junction-to-ambient (RθJA) and 30 °C/W junction-to-lead (RθJL), supporting reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR min/max | 189 V / 209 V at 1 mA - Verified breakdown voltage window ensures consistent turn-on threshold across production lots. |
| VC @ IPPM | 275 V at 1.09 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream components. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports robust protection against lightning-induced or inductive-switching transients. |
| ID @ VWM | <1.09 μA - Reverse leakage current at stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with JEDEC MS-013AC footprint. |
| RoHS & Halogen | M3 suffix = halogen-free, RoHS-compliant - Meets environmental compliance requirements for commercial and automotive applications. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 per J-STD-020, LF peak 260 °C. Bidirectional configuration has no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; voltage clamping occurs regardless of polarity - enables placement without orientation constraints. |
| Case (body) | Thermal and mechanical interface | No electrical connection; provides thermal path to PCB copper pads and mechanical anchoring during reflow soldering. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - reduces BOM count vs. dual unidirectional setup. |
| 400 W peak pulse power | Handles high-energy transients from inductive load switching (e.g., solenoid drivers) and ESD events up to ±30 kV contact discharge per IEC 61000-4-2. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low leakage drift over temperature and lifetime - critical for automotive and industrial field reliability. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile compatibility (peak 260 °C), eliminating moisture sensitivity handling requirements in manufacturing. |
| AEC-Q101 readiness | HM3 variant qualifies for automotive applications; base M3 version shares identical die and construction - simplifies qualification path for Tier 1 suppliers. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-clamping TVS placed directly at connector entry point to shunt transients before reaching sensitive ICs. Use Value: Limits induced voltage to ≤275 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and ADCs. |
Use Scenario: Shielding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers from field wiring surges and ground bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input differential pair, coordinated with series current-limiting resistors and filtering capacitors. Use Value: Maintains signal integrity by clamping transients within 1 ns while adding <1.09 μA leakage - avoids offset errors in precision 16-bit ADC measurements. |
| Telecom Line Protection | Consumer Power Adapter Output |
Use Scenario: Safeguarding Ethernet PHYs, DSL line drivers, and PoE injectors against lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Secondary-level TVS after gas discharge tube (GDT) or polymer PTC, providing fast-response clamping for residual energy. Use Value: Delivers 275 V clamping at 1.09 A, enabling coordination with upstream protectors to meet ITU-T K.21 heavy-duty surge requirements. |
Use Scenario: Suppressing output voltage spikes caused by transformer leakage inductance and rectifier reverse recovery in AC/DC adapters. IC Role / Device Role / Timing Role: Parallel-connected TVS across secondary-side DC output, acting as last-line defense before USB-C or barrel-jack connectors. Use Value: Withstands 400 W pulses without degradation, ensuring sustained protection over >100,000 surge events per IEC 61000-4-5 testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-M3/61 | Unidirectional variant; cathode band marked; VF = 3.5 V at 25 A forward conduction. | Requires correct polarity alignment; unsuitable for AC or floating signals where voltage reversal occurs. | Select only when protecting DC rails with known polarity and need for forward conduction capability. |
| SMBJ170CA-M3/61 | Same VWM/VC ratings but in SMB (DO-214AA) package; 400 W rating, RθJA = 100 °C/W. | Higher power density and lower thermal resistance; requires larger PCB footprint (4.57 mm × 3.94 mm vs. SMA's 4.50 mm × 2.29 mm). | Prefer when higher surge repetition rate or improved thermal performance is required, and board space allows SMB outline. |
Compared with SMAJ170A-M3/61, the SMAJ170CA-M3/61 eliminates polarity dependency for simplified layout and broader signal compatibility; versus SMBJ170CA-M3/61, it trades thermal margin for compactness - making it optimal for space-constrained automotive modules and portable industrial sensors.
Availability
SMAJ170CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line surge suppression requiring stable component supply, full traceability, and halogen-free compliance.
Supply support for SMAJ170CA-M3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and consumer systems - delivering standardized TVS performance in compact, automated-assembly-ready packages.
FAQ
What is the maximum clamping voltage of the SMAJ170CA-M3/61 under surge conditions?
The SMAJ170CA-M3/61 exhibits a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current of 1.09 A with a 10/1000 μs waveform. This value is measured per Fig. 1 and Table on page 2 of Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ170CA-M3/61 maintains this clamping performance across its specified operating temperature range.
Is the SMAJ170CA-M3/61 suitable for automotive applications?
Yes - the SMAJ170CA-M3/61 uses the same die and construction as AEC-Q101-qualified variants (e.g., SMAJ170CA-HM3_X); Vishay explicitly states AEC-Q101 qualification is available for the HM3 suffix. While the M3 suffix itself denotes halogen-free RoHS compliance, its underlying design meets automotive reliability requirements, and many Tier 1 suppliers qualify the M3 version for under-hood and chassis applications. The SMAJ170CA-M3/61 is widely used in automotive sensor modules and body control units.
How does the bidirectional configuration of the SMAJ170CA-M3/61 affect PCB layout?
The SMAJ170CA-M3/61 has no polarity marking and functions identically in either orientation, eliminating orientation verification during pick-and-place and reducing assembly defects. Unlike unidirectional TVS diodes, it can be placed across AC-coupled lines, transformer secondaries, or differential pairs without concern for anode/cathode alignment. This symmetry simplifies layout, reduces design review cycles, and improves yield - especially in high-density automotive ECUs where routing flexibility is constrained. The SMAJ170CA-M3/61 requires no silkscreen polarity indicator.
What is the thermal resistance of the SMAJ170CA-M3/61, and how does it impact power dissipation?
The SMAJ170CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per Vishay's recommended layout. At 25 °C ambient, its steady-state power dissipation (PD) is rated at 3.3 W; however, this derates linearly above 25 °C, reaching zero at 150 °C junction temperature. These values define safe continuous operation limits - the SMAJ170CA-M3/61 is intended for transient, not continuous, power handling.
Does the SMAJ170CA-M3/61 require special handling or baking prior to reflow soldering?
No - the SMAJ170CA-M3/61 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and withstands standard lead-free reflow profiles with peak temperatures up to 260 °C without preconditioning. Its moisture sensitivity level eliminates the need for dry-packaging, baking, or humidity-controlled storage, streamlining SMT line integration. This MSL Level 1 rating applies specifically to the SMAJ170CA-M3/61 and is confirmed in the "MECHANICAL DATA" section of Vishay document 88390.
SMAJ170CA-M3/61 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:
- -
- 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:
- 300W
- 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:
- DO-214AC (SMA)
SMAJ170CA-M3/61 FAQ
1.How can I place an order for SMAJ170CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ170CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ170CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CA-M3/61?
SMAJ170CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CA-M3/61 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-M3/61?
For technical support, including SMAJ170CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ170CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ170CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ170CA-M3/61?
All SMAJ170CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ170CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170CA-M3/61 Tags
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