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Vishay General Semiconductor - Diodes Division SMAJ120CA-E3/61
- Part No.:
- SMAJ120CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CA-E3/61.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
SMAJ120CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 120 V standoff voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤193 V at 1.6 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive power line and industrial sensor interface protection.
For engineers reviewing the SMAJ120CA-E3/61 datasheet, SMAJ120CA-E3/61 pinout, SMAJ120CA-E3/61 application, or SMAJ120CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3 suffix), UL 497B recognition, low thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on DO-214AC (SMA) footprint.
Technical Context
This device operates as a voltage-clamped crowbar during ESD or surge events, leveraging an avalanche junction to divert transient energy away from downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal lines.
Designed for fast response (<1 ps typical), it maintains stable clamping under repetitive surges (0.01% duty cycle) and exhibits low incremental surge resistance - critical for limiting let-through voltage during high-current transients like ISO 7637-2 Pulse 1/2a/5a or IEC 61000-4-5. The glass-passivated junction ensures long-term reliability under thermal cycling and humidity stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on across temperature and unit variation |
| VC (Clamping Voltage) | ≤193 V at IPPM = 1.6 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines residual stress on downstream ICs |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy-handling capacity; derates to 300 W above 78 V per spec note |
| IPPM (Peak Pulse Current) | 1.6 A - Maximum non-repetitive surge current supported; directly tied to PCB pad layout (0.2" × 0.2" Cu) |
| TJmax | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with J-STD-020 MSL Level 1 reflow |
Pinout & Package
Package: SMA (DO-214AC) - molded plastic case with matte tin-plated leads; meets UL 94 V-0; no polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either end serves as anode or cathode depending on transient polarity; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports automotive load-dump and inductive switching surge standards without derating in standard layouts |
| AEC-Q101 qualification option (HE3 suffix) | Enables direct use in automotive powertrain and body electronics where component-level reliability validation is mandatory |
| UL 497B recognized (QVGQ2, E136766) | Meets safety agency requirements for telecom and industrial signal-line protectors without additional system-level certification burden |
| Low RθJA = 120 °C/W | Enables reliable operation at elevated ambient temperatures (e.g., near power converters) with minimal heatsinking |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without moisture sensitivity handling restrictions |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver power rails against battery dump and alternator load-switching transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between VCC and GND upstream of LDO or DC-DC converter input. Use Value: Limits let-through voltage to ≤193 V during ISO 7637-2 Pulse 5a (100 V, 400 ms), preventing regulator latch-up or MOSFET gate oxide damage. |
Use Scenario: Shielding 4–20 mA current-loop sensor inputs from field-induced lightning surges in factory automation systems. IC Role / Device Role / Timing Role: Primary surge shunt across input terminals, coordinated with series current-limiting resistor and filter capacitor. Use Value: Clamps 1 kV/1.2–50 μs combo wave to <200 V within nanoseconds, preserving analog front-end accuracy and avoiding ADC saturation. |
| Telecom DSL Line Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding ADSL/VDSL line drivers from induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across line pair, referenced to isolated ground plane. Use Value: Maintains signal integrity up to 30 MHz while suppressing 6 kV contact ESD (IEC 61000-4-2) and 10/700 μs telecom surges to safe levels. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., washing machine drum drives). IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback during PWM commutation or sudden stop events. Use Value: Absorbs 400 W pulses without degradation, extending MOSFET lifetime and eliminating need for snubber RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/61 | Unidirectional version; same VWM, VBR, VC, and PPPM; includes cathode band marking | Requires known polarity in DC circuits; unsuitable for AC or floating differential lines | Select when protecting unidirectional DC rails (e.g., 12 V supply) where polarity is fixed and lower cost is prioritized |
| SMBJ120CA-E3/52 | Same VWM/VBR but SMB package (DO-214AA); higher IPPM = 2.2 A; PPPM = 600 W | Occupies larger PCB area; better suited for higher-energy surges requiring >400 W dissipation | Choose when system-level testing reveals marginal clamping margin with SMAJ120CA-E3/61 and board space permits SMB footprint |
Compared with SMAJ120A-E3/61, the SMAJ120CA-E3/61 eliminates polarity dependency for flexible layout in AC-coupled paths; versus SMBJ120CA-E3/52, it trades surge headroom for compactness - ideal where space-constrained automotive modules demand DO-214AC compatibility.
Availability
SMAJ120CA-E3/61 is available at Aetrix Electronics and suitable for automotive infotainment power conditioning, industrial PLC analog input protection, and telecom line card surge hardening requiring stable component supply and full traceability.
Supply support for SMAJ120CA-E3/61 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 targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for fast clamping, repeatable surge endurance, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMAJ120CA-E3/61 at its rated peak pulse current?
The SMAJ120CA-E3/61 clamps to a maximum of 193 V at its specified peak pulse current of 1.6 A (10/1000 μs waveform). This value is measured under standardized test conditions with 0.2" × 0.2" copper pads per terminal and represents the upper limit of voltage imposed on protected circuitry during a defined surge event. The SMAJ120CA-E3/61 achieves this performance while maintaining bidirectional symmetry and low thermal resistance.
Is SMAJ120CA-E3/61 RoHS-compliant and halogen-free?
Yes, SMAJ120CA-E3/61 carries the "E3" suffix, indicating it is RoHS-compliant and qualified to commercial grade standards. It is not halogen-free - that designation requires the "M3" suffix (e.g., SMAJ120CA-M3/61). The E3 variant uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance, making it suitable for most industrial and automotive applications where halogen content is not restricted.
Does SMAJ120CA-E3/61 have AEC-Q101 qualification?
The base SMAJ120CA-E3/61 is not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ120CAHE3_X variant (e.g., SMAJ120CAHE3_A) which adds AEC-Q101 qualification for automotive applications. The "HE3" suffix denotes RoHS-compliant + AEC-Q101 qualified versions, with "_X" indicating revision code. For automotive designs requiring certified reliability, specify the HE3 variant rather than E3.
What is the thermal resistance junction-to-ambient for SMAJ120CA-E3/61?
The typical thermal resistance junction-to-ambient (RθJA) for SMAJ120CA-E3/61 is 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper per terminal). This value assumes natural convection and is critical for calculating maximum power dissipation at elevated ambient temperatures. The SMAJ120CA-E3/61 also has RθJL = 30 °C/W, supporting efficient heat transfer to PCB copper planes or thermal vias.
How does SMAJ120CA-E3/61 differ from SMAJ120A-E3/61?
SMAJ120CA-E3/61 is the bidirectional version, while SMAJ120A-E3/61 is unidirectional. Both share identical electrical ratings (VWM = 120 V, VBR = 133–147 V, VC ≤ 193 V), but only the "CA" variant suppresses transients regardless of polarity - essential for AC signals, differential buses, or floating grounds. The SMAJ120A-E3/61 includes a cathode band marking; SMAJ120CA-E3/61 has no marking due to symmetry.
SMAJ120CA-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ120CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CA-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ120CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ120CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CA-E3/61?
SMAJ120CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CA-E3/61 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-E3/61?
For technical support, including SMAJ120CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ120CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ120CA-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ120CA-E3/61?
All SMAJ120CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CA-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ120CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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