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Vishay General Semiconductor - Diodes Division SMAJ120A-M3/61
- Part No.:
- SMAJ120A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120A-M3/61.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ120A-M3/61 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 - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ120A-M3/61 datasheet, SMAJ120A-M3/61 pinout, SMAJ120A-M3/61 application, or SMAJ120A-M3/61 equivalent, key selection criteria include unidirectional polarity, 120 V reverse stand-off capability, 193 V clamping under surge, thermal resistance of 120 °C/W (junction-to-ambient), and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a fast-acting shunt protector: when transient voltage exceeds VBR, it avalanches into low-impedance conduction to clamp the line at ≤193 V. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at 120 V), while the SMA package supports automated placement and meets MSL Level 1 reflow (260 °C peak).
It delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold; its 1.6 A IPPM at VC = 193 V is validated on 5.0 mm × 5.0 mm copper pads per JEDEC standard. The device is not AEC-Q101 qualified (M3 suffix denotes halogen-free commercial grade only, not automotive qualification).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR min/max | 133 V / 147 V at IT = 1 mA - Confirmed avalanche onset window; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 193 V at 1.6 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capacity; defines survivability against lightning or inductive spikes. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates robustness against power-line fault currents. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad; sets power derating limits above 25 °C ambient. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with standard SMT reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated. Cathode identified by black band; anode is unmarked end. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE > VBR. |
| Anode (unbanded end) | Reference node | Typically tied to ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 120 V DC rails without derating. |
| 193 V clamping voltage at 1.6 A | Limits downstream IC stress to <200 V during transients - critical for 150 V-rated MOSFETs and industrial controllers. |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime; reduces parameter drift vs. epoxy-passivated alternatives. |
| Halogen-free, RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing logistics. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) Input |
|---|---|
Use Scenario: 120 V DC input stage of programmable logic controller (PLC) power supply exposed to relay coil flyback and load dump. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between +120 V rail and chassis ground to clamp transients before they reach DC-DC converter ICs. Use Value: Limits voltage excursion to ≤193 V during 1.6 A surge, preventing damage to 200 V-rated input capacitors and primary-side MOSFETs. |
Use Scenario: 12 V battery-fed input of BCM receiving CAN/LIN signals and driving solenoids; subject to ISO 7637-2 Pulse 1/2a/5a. IC Role / Device Role / Timing Role: Standoff-rated TVS on main power rail to absorb negative-going load dump spikes up to 120 V. Use Value: Withstands 40 A surge (8.3 ms) and clamps 10/1000 μs pulses to 193 V - compliant with ISO 16750-2 Class D test levels. |
| Telecom Line Card Surge Protection | Motor Drive Gate Driver Protection |
Use Scenario: DC feed line (48 V or 120 V) powering remote telecom equipment in outdoor cabinets vulnerable to induced lightning surges. IC Role / Device Role / Timing Role: Primary-stage TVS on power entry board, upstream of EMI filter and DC-DC converters. Use Value: 400 W pulse rating handles 10/1000 μs surges up to 4 kV (2 Ω source), meeting GR-1089-CORE Section 4.5.2.2 requirements. |
Use Scenario: High-side gate driver supply rail (15–20 V) in 3-phase inverter, subjected to Miller-induced voltage spikes during IGBT switching. IC Role / Device Role / Timing Role: Local TVS across gate driver VCC-GND to suppress sub-100 ns ringing and overshoot. Use Value: Fast response time (<1 ns) and low clamping (193 V) prevent gate oxide breakdown in 25 V-rated drivers without adding RC snubbers. |
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 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable where halogen content is unrestricted; may not meet IPC-1752A Category 4 reporting. | Select E3 if halogen-free requirement is absent and cost optimization is prioritized. |
| SMAJ120CA-M3/61 | Bidirectional version; symmetric VBR (133–147 V) and same VC (193 V), but no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Choose CA only if bidirectional clamping is needed; unidirectional SMAJ120A-M3/61 is optimal for DC rails with defined ground reference. |
Compared with SMAJ120A-E3/61, the M3 variant adds halogen-free compliance without performance trade-offs; versus SMAJ120CA-M3/61, the unidirectional version offers lower leakage and avoids unnecessary symmetry in grounded DC systems.
Availability
SMAJ120A-M3/61 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom infrastructure, and motor drive designs requiring stable component supply with halogen-free compliance and high-energy surge immunity.
Supply support for SMAJ120A-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, power efficiency, and automotive-grade qualification.
The SMAJ series targets cost-sensitive, high-volume transient protection applications in industrial, telecom, and consumer electronics - engineered for robust surge handling in compact surface-mount form factors.
FAQ
What is the clamping voltage of SMAJ120A-M3/61 under a 10/1000 μs surge?
The SMAJ120A-M3/61 clamps to a maximum of 193 V when subjected to its rated peak pulse current of 1.6 A with a 10/1000 μs waveform. This value is measured per JEDEC standard test conditions on 5.0 mm × 5.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ120A-M3/61 maintains this clamping performance across its specified operating temperature range of –55 °C to +150 °C.
Is SMAJ120A-M3/61 AEC-Q101 qualified?
No, SMAJ120A-M3/61 is not AEC-Q101 qualified. The "M3" suffix indicates halogen-free, RoHS-compliant commercial-grade construction only. For automotive-qualified versions, Vishay offers the SMAJ120A-HM3_X series (e.g., SMAJ120A-HM3_A), which carry explicit AEC-Q101 certification and are marked with "HM3" plus revision code. The SMAJ120A-M3/61 is intended for industrial, telecom, and consumer applications where automotive qualification is not required.
What does the "/61" in SMAJ120A-M3/61 signify?
The "/61" in SMAJ120A-M3/61 denotes the preferred packaging configuration: 7-inch diameter plastic tape and reel containing 1800 units. This format is optimized for high-speed SMT placement equipment and aligns with industry-standard EIA-481 specifications. The "61" code is distinct from "5A" (13-inch reel, 7500 units) and does not affect electrical or thermal characteristics of the SMAJ120A-M3/61 device itself.
How does SMAJ120A-M3/61 differ from SMAJ120CA-M3/61?
SMAJ120A-M3/61 is unidirectional with cathode band marking and specified for DC line protection, whereas SMAJ120CA-M3/61 is bidirectional with no polarity marking and intended for AC or floating signal paths. Both share identical VBR, VC, and PPPM, but the unidirectional SMAJ120A-M3/61 exhibits lower reverse leakage (<1.0 μA at 120 V) compared to the bidirectional version's higher ID limit. Use SMAJ120A-M3/61 for grounded DC rails; choose SMAJ120CA-M3/61 only when polarity reversal is possible.
What is the thermal resistance of SMAJ120A-M3/61, and how does it impact layout?
The SMAJ120A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain reliability under sustained power dissipation, designers must limit average power to ≤3.3 W and apply derating above 25 °C ambient - e.g., 2.5 W at 50 °C. Larger copper areas or thermal vias reduce RθJA and improve surge endurance.
SMAJ120A-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:
- 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:
- 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)
SMAJ120A-M3/61 FAQ
1.How can I place an order for SMAJ120A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120A-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 SMAJ120A-M3/61 reliable?
The price and inventory of SMAJ120A-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 SMAJ120A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ120A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120A-M3/61?
SMAJ120A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120A-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 SMAJ120A-M3/61?
For technical support, including SMAJ120A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120A-M3/61 requirements.
6.How does Aetrix verify that SMAJ120A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ120A-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 SMAJ120A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ120A-M3/61?
All SMAJ120A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120A-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 SMAJ120A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ120A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120A-M3/61 Tags
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