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Vishay General Semiconductor - Diodes Division SMAJ120AHM3/I
- Part No.:
- SMAJ120AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120AHM3/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,061
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Product details
Overview
SMAJ120AHM3/I from Vishay General Semiconductor is a unidirectional 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 stand-off 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ120AHM3/I datasheet, SMAJ120AHM3/I pinout, SMAJ120AHM3/I application, or SMAJ120AHM3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 120 V stand-off capability, thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when reverse voltage exceeds VBR to divert surge energy away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports automated placement and meets MSL level 1 reflow requirements (peak 260 °C).
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), operates across –55 °C to +150 °C junction temperature range, and exhibits low incremental surge resistance - enabling effective suppression of transients induced by inductive load switching, ESD, and lightning surges in DC power rails and low-speed signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR min/max | 133 V / 147 V at 1 mA - guaranteed breakdown window ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 193 V at 1.6 A - clamping voltage under standardized 10/1000 μs surge; determines maximum stress seen by protected IC. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; defines transient energy absorption capacity. |
| ID @ VWM | 1.0 μA - reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking; compatible with standard SMT assembly processes. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; completes conduction path during reverse-biased clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V supply or signal trace); receives transient voltage and initiates clamping when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, body electronics, and ADAS subsystems. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for global OEM supply chains without compromising thermal or electrical performance. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in 24 V industrial systems and 12 V automotive battery lines without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during clamping - critical for protecting 130 V-rated MOSFETs and wide-VDS power devices. |
| MSL Level 1 moisture sensitivity | Enables direct placement into reflow ovens without baking; reduces manufacturing complexity and cost in high-volume production. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive-going surges above 120 V. Use Value: Limits peak voltage to ≤193 V during 400 W transients, preventing damage to LDOs, microcontrollers, and CAN transceivers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) TVS connected across signal and ground to absorb sub-100 ns ESD pulses. Use Value: Maintains signal fidelity with negligible DC loading while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| DC Motor Drive Circuit Protection | Telecom Power Supply Input Protection |
|
Use Scenario: Safeguarding H-bridge MOSFET gates and drivers from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Fast-response (<1 ns) TVS placed across motor supply rail to clamp flyback spikes. Use Value: Clamps 100 V+ transients within nanoseconds, preventing gate oxide rupture and shoot-through failure in logic-level MOSFETs. |
Use Scenario: Guarding primary-side DC input of telecom AC/DC converters against lightning-induced surges on PoE or wall adapters. IC Role / Device Role / Timing Role: High-power (400 W) TVS deployed upstream of input filter capacitors to absorb differential-mode surges. Use Value: Withstands repeated 10/1000 μs transients up to 1.6 A without parameter shift - extends converter MTBF in outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free requirement is waived (e.g., non-automotive industrial use). | Select SMAJ120AHM3/I when full halogen-free compliance is mandated by OEM or regional regulation. |
| SMAJ120A-M3/61 | Same halogen-free RoHS spec, but packaged in 7" tape-and-reel (1800 pcs) vs. 13" reel (7500 pcs); no AEC-Q101 qualification. | Intended for commercial-grade applications lacking automotive reliability validation. | Choose SMAJ120AHM3/I for automotive or mission-critical industrial designs requiring AEC-Q101 traceability. |
Compared with SMAJ120AHE3/I and SMAJ120A-M3/61, the SMAJ120AHM3/I uniquely combines halogen-free construction, AEC-Q101 qualification, and 13" reel packaging - making it the preferred choice for Tier 1 automotive suppliers and high-reliability industrial OEMs requiring full regulatory alignment and volume procurement support.
Availability
SMAJ120AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom power supplies, and sensor interface modules requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ120AHM3/I 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 was developed for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability under thermal stress are essential.
FAQ
What is the clamping voltage of SMAJ120AHM3/I at its rated peak pulse current?
The SMAJ120AHM3/I has a maximum clamping voltage (VC) of 193 V at 1.6 A peak pulse current (IPPM), measured using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's datasheet revision 09-Jan-2024, page 2. The SMAJ120AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMAJ120AHM3/I qualified to AEC-Q101 standards?
Yes, SMAJ120AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix in its part number and confirmed in the Vishay datasheet section "MECHANICAL DATA". This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD, validating its suitability for automotive electronic control units and body electronics applications.
What does the 'HM3' suffix mean in SMAJ120AHM3/I?
The 'HM3' suffix in SMAJ120AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay documentation, HM3 parts use molding compounds and plating that meet JEDEC JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards - distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101, non-halogen-free) variants.
Can SMAJ120AHM3/I be used in bidirectional configurations?
No, SMAJ120AHM3/I is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and the presence of a cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., SMAJ120CA). Using SMAJ120AHM3/I in reverse-biased signal paths without proper polarity alignment will result in unintended conduction or failure to suppress negative transients.
What is the thermal resistance from junction to ambient for SMAJ120AHM3/I?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ120AHM3/I is 120 °C/W, measured on the recommended 0.2" × 0.2" copper pad layout per Vishay datasheet page 3. This value informs derating calculations for power dissipation at elevated ambient temperatures and confirms suitability for compact PCB layouts with limited heatsinking.
SMAJ120AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ120AHM3/I FAQ
1.How can I place an order for SMAJ120AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120AHM3/I 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 SMAJ120AHM3/I reliable?
The price and inventory of SMAJ120AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ120AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120AHM3/I?
SMAJ120AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120AHM3/I 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 SMAJ120AHM3/I?
For technical support, including SMAJ120AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120AHM3/I requirements.
6.How does Aetrix verify that SMAJ120AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ120AHM3/I 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 SMAJ120AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ120AHM3/I?
All SMAJ120AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120AHM3/I, 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 SMAJ120AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ120AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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