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Vishay General Semiconductor - Diodes Division SMAJ120CA-M3/61
- Part No.:
- SMAJ120CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CA-M3/61.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,012
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Product details
Overview
SMAJ120CA-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 120 V standoff voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 V maximum clamping voltage (VC) at 1.6 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ120CA-M3/61 datasheet, SMAJ120CA-M3/61 pinout, SMAJ120CA-M3/61 application, or SMAJ120CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, M3 halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative polarity transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports rapid energy dissipation during ESD or lightning-induced surges.
The device is rated for 400 W peak pulse power below 78 V and derates to 300 W above 78 V per Fig. 2 in the datasheet, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes - though SMAJ120CA-M3/61 itself is commercial-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 120 V nominal systems. |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown range ensures reliable turn-on within ±5.6% tolerance under standardized test conditions. |
| VC @ IPPM | 193 V at 1.6 A - Clamping voltage limits downstream component stress during worst-case 10/1000 μs transient events. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating determines survivability against repetitive surge events at specified duty cycle (0.01%). |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine) validates robustness against inrush or fault currents in unidirectional configurations. |
| TJ max | +150 °C - Maximum junction temperature enables operation in high-ambient environments such as motor drives and automotive under-hood modules. |
| 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-013. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | One terminal of symmetrical PN junction; conducts during negative voltage excursions relative to cathode reference. |
| Cathode | Transient current entry (positive polarity event) | Second terminal of symmetrical PN junction; conducts during positive voltage excursions - functionally identical to anode in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) when properly mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 3.3 V or 5 V logic rails within safe margins during transients. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking, simplifying SMT manufacturing flow. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for export markets including EU, Japan, and China without compromising electrical performance. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Bidirectional TVS placed across relay coil terminals and MCU input pins to clamp fast-rising L·di/dt spikes. Use Value: Limits transient voltage to ≤193 V, preventing latch-up or oxide breakdown in 3.3 V/5 V MCUs and ensuring >100,000-cycle relay reliability. |
Use Scenario: Shielding LIN bus transceivers and sensor supply lines from load dump and jump-start surges in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS on VCC rail and data lines to absorb 12 V system-level transients up to ISO 7637-2 Pulse 5a. Use Value: Maintains 120 V standoff while clamping to 193 V, allowing upstream DC-DC converters to remain functional during 35 V/100 ms load dump events. |
| Telecom Power Interfaces | Consumer Appliance Control Boards |
|
Use Scenario: Safeguarding PoE-powered Ethernet PHYs and auxiliary 48 V DC-DC converters against induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side 48 V output rails and isolated data lines to meet IEC 61000-4-5 (10/700 μs) requirements. Use Value: Withstands 400 W pulses and exhibits <1.0 μA leakage at 120 V, minimizing standby power loss while meeting EN 61000-6-2 immunity standards. |
Use Scenario: Protecting touch controller inputs and display backlight drivers in washing machines and HVAC panels exposed to ESD and EFT. IC Role / Device Role / Timing Role: Localized TVS on front-panel buttons and LED driver outputs to suppress contact discharge (IEC 61000-4-2 ±8 kV) and burst noise. Use Value: Fast response time (<1 ns) and low clamping voltage prevent false triggering or latch-up in capacitive touch ICs operating at 3.3 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-M3/61 | Unidirectional version with cathode band marking; same VWM, VBR, VC, and PPPM. | Requires correct polarity orientation; unsuitable for AC or floating nodes where voltage polarity reverses. | Select only when protecting DC rails with known fixed polarity and space-constrained layouts needing identical footprint. |
| SMBJ120CA-M3/61 | Same electrical specs but in larger SMB (DO-214AA) package; 400 W rating maintained with improved thermal dissipation (RθJA = 80 °C/W). | Better suited for higher ambient temperatures or higher duty-cycle surge environments due to lower thermal resistance. | Choose when board layout allows larger footprint and thermal performance is prioritized over miniaturization. |
Compared with SMAJ120CA-M3/61, the unidirectional SMAJ120A-M3/61 demands strict polarity alignment but offers identical clamping performance, while the SMBJ120CA-M3/61 trades compactness for enhanced thermal margin - making SMAJ120CA-M3/61 optimal for space-limited bidirectional protection with standard thermal budgets.
Availability
SMAJ120CA-M3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power interfaces, and consumer appliance control boards requiring stable component supply and halogen-free compliance.
Supply support for SMAJ120CA-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh electromagnetic environments - targeting design-in across industrial automation, automotive electronics, and infrastructure equipment where field reliability is critical.
FAQ
What is the clamping voltage of SMAJ120CA-M3/61 at its rated peak pulse current?
The SMAJ120CA-M3/61 has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 1.6 A, measured using a 10/1000 μs waveform. This value is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ120CA-M3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ120CA-M3/61 suitable for automotive applications?
SMAJ120CA-M3/61 is a commercial-grade part with halogen-free RoHS compliance (M3 suffix) but is not AEC-Q101 qualified. For automotive use, Vishay specifies AEC-Q101 variants with HE3 or HM3 suffixes (e.g., SMAJ120CAHE3_A). The SMAJ120CA-M3/61 may be used in non-safety-critical aftermarket or infotainment subsystems where qualification is not mandated, but it does not carry the stress-test validation required for under-hood or ADAS applications.
How does the bidirectional configuration of SMAJ120CA-M3/61 affect PCB layout?
The SMAJ120CA-M3/61 has no polarity marking and functions identically in both directions, eliminating orientation constraints during automated placement. Unlike unidirectional variants (e.g., SMAJ120A-M3/61), it requires no silkscreen polarity indicator or directional routing - simplifying layout for differential lines, AC-coupled sensors, or floating grounds. This symmetry also avoids risk of misplacement-induced failure, making SMAJ120CA-M3/61 ideal for high-mix SMT lines.
What is the thermal resistance of SMAJ120CA-M3/61, and how does it impact power derating?
SMAJ120CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. This value directly governs power derating above 25 °C ambient: per Figure 2 in the datasheet, its peak pulse power drops to ~300 W at 70 °C ambient and further declines linearly to zero at 150 °C junction temperature. Proper pad sizing and adjacent copper area are essential to maintain SMAJ120CA-M3/61 within safe thermal limits during repetitive surge events.
Does SMAJ120CA-M3/61 meet any industry surge immunity standards out-of-the-box?
SMAJ120CA-M3/61 is characterized to withstand 400 W (10/1000 μs) and 300 W (above 78 V) surges per IEC 61000-4-5, but system-level compliance depends on PCB layout, grounding, and upstream impedance. When mounted per Vishay's recommended 5.0 mm × 5.0 mm pad layout and used with appropriate series impedance (e.g., 2 Ω current-limiting resistor), SMAJ120CA-M3/61 enables designs to pass IEC 61000-4-5 Level 3 (2 kV line-earth) and Level 4 (4 kV) testing. Full certification requires full-system validation.
SMAJ120CA-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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- 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)
SMAJ120CA-M3/61 FAQ
1.How can I place an order for SMAJ120CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CA-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 SMAJ120CA-M3/61 reliable?
The price and inventory of SMAJ120CA-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 SMAJ120CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ120CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CA-M3/61?
SMAJ120CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CA-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 SMAJ120CA-M3/61?
For technical support, including SMAJ120CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ120CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ120CA-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 SMAJ120CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ120CA-M3/61?
All SMAJ120CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CA-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 SMAJ120CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ120CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120CA-M3/61 Tags
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