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Vishay General Semiconductor - Diodes Division SMAJ120CA-M3/5A
- Part No.:
- SMAJ120CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CA-M3/5A.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,073
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Product details
Overview
SMAJ120CA-M3/5A 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 rating with 10/1000 μs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ120CA-M3/5A datasheet, SMAJ120CA-M3/5A pinout, SMAJ120CA-M3/5A application, or SMAJ120CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), halogen-free RoHS-compliant construction (M3 suffix), and AEC-Q101 qualification eligibility via HM3 variant - critical for automotive ECU and telecom surge protection design.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transient overvoltages and diverting surge current away from sensitive downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for full 400 W rating above 78 V. The device is rated for -55 °C to +150 °C junction temperature and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction |
| VC @ IPPM | 193 V at 1.6 A - Clamping voltage under 10/1000 μs surge; limits stress on protected ICs to ≤193 V |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; derates to 300 W above 78 V per spec |
| IDR @ VWM | 1.0 μA - Reverse leakage at 120 V; negligible power loss and minimal impact on high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height for automated placement |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Both terminals function identically; transient current flows symmetrically regardless of polarity - eliminates orientation constraints during PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - enables single-device protection of AC lines, differential buses, or floating sensors |
| 400 W peak pulse power | Rated with 10/1000 μs waveform on 5.0 mm × 5.0 mm copper pads - handles common lightning-induced surges per IEC 61000-4-5 Level 3 |
| Halogen-free & RoHS-compliant (M3) | Meets JEDEC J-STD-20 and JESD201 Class 2 whisker resistance - supports lead-free reflow and environmental compliance for global OEMs |
| Fast response time | <1 ps turn-on - clamps transients before propagation into protected ICs, preventing latch-up or gate oxide damage |
| AEC-Q101 qualified option | HM3 suffix variant available - validated for automotive powertrain and body electronics per stress test requirements |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across input terminals of DC-DC converters or microcontrollers. Use Value: Limits rail voltage to ≤193 V during 100 V/50 ms load dump events, preventing brownout or overvoltage reset of safety-critical MCUs. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to ESD and cable discharge. IC Role / Device Role / Timing Role: Bidirectional clamp on signal pair to absorb ±8 kV contact ESD per IEC 61000-4-2 without signal distortion. Use Value: Maintains signal integrity with <1 μA leakage at 120 V, avoiding offset errors in precision current-sense amplifiers. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Front-end protection of Ethernet PHY power pins and auxiliary bias rails in base station line cards subjected to induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of LDOs and PoE controllers, coordinated with GDT or MOV secondary stages. Use Value: Fast sub-nanosecond response captures fast-rising transients (<100 ns rise time) before slower protectors activate, reducing let-through energy. |
Use Scenario: Secondary-side overvoltage suppression in universal-input AC/DC adapters after rectification and bulk capacitance. IC Role / Device Role / Timing Role: Standoff-rated clamp across DC bus to prevent capacitor overvoltage during mains transients or startup overshoot. Use Value: 120 V VWM provides 20 % margin above nominal 100 V DC bus, while 193 V VC stays below 200 V capacitor rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Acceptable for commercial-grade designs where halogen-free requirement is not mandated | Select when cost sensitivity outweighs halogen-free compliance; identical thermal and mechanical behavior |
| SMAJ120A-M3/5A | Unidirectional version with cathode band marking; same VWM, VBR, VC, and PPPM | Required only for DC-biased lines where polarity is fixed and reverse conduction must be blocked | Choose only if circuit topology enforces unidirectional voltage stress; otherwise bidirectional offers layout flexibility |
Compared with SMAJ120CA-M3/5A, the E3 variant trades halogen-free status for lower unit cost in non-automotive applications, while the unidirectional SMAJ120A-M3/5A adds polarity dependency without electrical advantage - making the bidirectional M3 version optimal for most floating or AC-coupled protection tasks.
Availability
SMAJ120CA-M3/5A is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive ECUs, telecom line cards, and consumer power adapter designs requiring stable component supply with halogen-free compliance and surge immunity up to 400 W.
Supply support for SMAJ120CA-M3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade validation.
The SMAJ series was developed specifically for robust, surface-mount transient suppression in space-constrained power and signal lines across automotive, industrial, and telecom infrastructure - prioritizing low clamping ratio and repeatable surge endurance.
FAQ
What is the maximum clamping voltage of the SMAJ120CA-M3/5A under standard test conditions?
The SMAJ120CA-M3/5A exhibits a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current of 1.6 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, Document Number 88390. The clamping performance ensures protected downstream components experience no more than 193 V during surge events.
Is the SMAJ120CA-M3/5A suitable for automotive applications?
Yes - the SMAJ120CA-M3/5A is halogen-free and RoHS-compliant, and its AEC-Q101-qualified counterpart (SMAJ120CA-HM3/5A) is explicitly validated for automotive use. While the M3 suffix itself denotes commercial-grade qualification, the identical die and packaging enable drop-in use in non-safety-critical automotive subsystems such as infotainment power rails or body control modules when paired with appropriate system-level validation.
How does the bidirectional nature of the SMAJ120CA-M3/5A affect PCB layout?
The SMAJ120CA-M3/5A has no polarity marking and functions identically in both directions, so PCB layout requires no orientation alignment - either terminal may connect to either side of the protected line. This simplifies routing in differential pairs, AC-coupled interfaces, or floating grounds, and eliminates risk of incorrect placement during automated assembly. No silkscreen polarity indicator is needed.
What is the thermal resistance and recommended pad layout for full 400 W rating of the SMAJ120CA-M3/5A?
The SMAJ120CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads on each terminal to sustain its full 400 W peak pulse power rating. Smaller pads reduce power handling capacity and require derating per Figure 2 in the Vishay datasheet. Thermal vias beneath pads further improve heat dissipation in high-reliability designs.
Does the SMAJ120CA-M3/5A meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes - the SMAJ120CA-M3/5A meets J-STD-020 Moisture Sensitivity Level 1, with a maximum peak reflow temperature of 260 °C. This allows unlimited floor life and compatibility with standard lead-free soldering profiles without baking preconditioning, supporting high-yield SMT manufacturing for commercial and industrial electronics production.
SMAJ120CA-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ120CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ120CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ120CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CA-M3/5A?
SMAJ120CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CA-M3/5A 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-M3/5A?
For technical support, including SMAJ120CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ120CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ120CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ120CA-M3/5A?
All SMAJ120CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ120CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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