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Vishay General Semiconductor - Diodes Division SMAJ120-E3/61
- Part No.:
- SMAJ120-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120-E3/61.pdf
- Description:
- TVS DIODE 120VWM 214VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,605
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Product details
Overview
SMAJ120-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 120 V stand-off voltage (VWM), 133–163 V breakdown voltage (VBR at 1 mA), 214 V maximum clamping voltage (VC) at 1.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ120-E3/61 datasheet, SMAJ120-E3/61 pinout, SMAJ120-E3/61 application, or SMAJ120-E3/61 equivalent, this device is selected for robust overvoltage protection in DC power rails, automotive sensor interfaces, industrial I/O lines, and telecom signal conditioning where low leakage (<1 µA at VWM), fast response time, and stable clamping under repetitive surge conditions are critical.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to limit transient energy across protected circuit nodes. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
Rated for 150 °C maximum junction temperature and compliant with J-STD-020 MSL Level 1, SMAJ120-E3/61 supports lead-free reflow up to 260 °C and withstands 40 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2 × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working margin. |
| VBR (min/max) | 133 V / 163 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on above nominal rail. |
| VC @ IPPM | 214 V at 1.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; enables protection against high-energy transients. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates robustness against motor-switching events. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-powered systems. |
| TJ Range | −55 °C to +150 °C - Full industrial/automotive operating junction temperature range; supports under-hood use. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (uni-directional) | Connected to lower-potential side of protected line; conducts only during forward surge or bias. |
| Cathode | Reverse-biased clamping node | Connected to higher-potential side (e.g., VCC rail); avalanches to clamp transients to ground or return path. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under thermal cycling. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1 compliance | Enables standard SMT reflow without moisture sensitivity concerns; no bake required prior to assembly. |
| RoHS-compliant, commercial-grade E3 suffix | Meets EU Directive 2002/95/EC; qualified per JESD201 Class 1A whisker test for solder joint integrity. |
| 400 W peak pulse power (≤78 V), 300 W (>78 V) | Validated clamping performance across full voltage family; SMAJ120-E3/61 delivers 300 W capability. |
Applications
| Automotive Sensor Interface | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and chassis ground, responding within nanoseconds to suppress >100 V spikes. Use Value: Limits transient voltage to ≤214 V at 1.4 A, preserving signal integrity and preventing latch-up in 5 V/12 V interface ICs. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring transients and relay coil kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to divert surge current away from optocoupler inputs and protection resistors. Use Value: Withstands 40 A surge (8.3 ms) and maintains <1 µA leakage at 24 V, enabling reliable detection without false triggering. |
| Telecom Power Rail Protection | Consumer Power Adapter Output |
Use Scenario: Secondary-side overvoltage suppression on 48 V PoE (Power over Ethernet) or base station DC distribution rails. IC Role / Device Role / Timing Role: Unidirectional clamping device tied between +48 V and return, activated only during positive-going surges. Use Value: Clamps 10/1000 µs transients to 214 V while dissipating 400 W peak power-compatible with IEC 61000-4-5 Level 4 requirements. |
Use Scenario: Output-stage protection in AC/DC adapters for smart home devices, limiting fault voltage during output short-circuit recovery. IC Role / Device Role / Timing Role: Final-line defense after primary regulation, absorbing residual switching spikes and external coupling noise. Use Value: 120 V VWM provides 20 % margin above nominal 100 V DC output; low capacitance avoids affecting feedback loop stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/61 | Lower VBR range (133–147 V), tighter tolerance; clamps at 193 V @ 1.6 A. | Better suited for precision 12 V systems where lower clamping voltage reduces stress on downstream regulators. | Select SMAJ120A-E3/61 when tighter VBR control and reduced VC are prioritized over absolute peak power rating. |
| SMCJ120A-E3/57T | DO-214AB (SMC) package; higher PPPM (1500 W), same VWM/VC specs. | Used where higher surge energy handling is required, e.g., main power input stages or harsher EMC environments. | Choose SMCJ120A-E3/57T only if PCB layout allows larger footprint and system-level testing demands >400 W pulse capability. |
Compared with SMAJ120-E3/61, SMAJ120A-E3/61 offers improved clamping voltage but reduced surge margin, while SMCJ120A-E3/57T trades compactness for higher power handling-neither is pin-compatible due to differing packages (DO-214AC vs. DO-214AB), requiring layout revision.
Availability
SMAJ120-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC input protection, and telecom power rail protection requiring stable component supply, RoHS-compliant sourcing, and consistent MSL Level 1 handling.
Supply support for SMAJ120-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for surface-mount transient suppression in space-constrained, high-reliability applications-including automotive, industrial, and telecom-where fast response, stable clamping, and reflow compatibility are essential design requirements.
FAQ
What is the maximum clamping voltage of SMAJ120-E3/61 under standard test conditions?
The maximum clamping voltage (VC) of SMAJ120-E3/61 is 214 V, measured at a peak pulse current (IPPM) of 1.4 A using the standardized 10/1000 µs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during a transient event and is confirmed in the Vishay datasheet Document Number 88390, page 3.
Is SMAJ120-E3/61 unidirectional or bidirectional, and how is polarity identified?
SMAJ120-E3/61 is a unidirectional TVS diode. Polarity is marked by a cathode band on the package body, aligned with the cathode terminal. This band must be oriented toward the higher-potential side of the protected line (e.g., VCC or signal rail), while the anode connects to ground or return-ensuring proper clamping action during reverse transients.
Does SMAJ120-E3/61 meet automotive qualification standards?
No, SMAJ120-E3/61 carries the E3 suffix, indicating RoHS-compliant commercial grade per JESD201 Class 1A whisker test. For automotive applications, Vishay specifies the HE3 suffix (e.g., SMAJ120AHE3/61), which is AEC-Q101 qualified. SMAJ120-E3/61 is not rated for automotive use unless validated separately by the end customer.
What is the thermal resistance and recommended pad layout for SMAJ120-E3/61?
SMAJ120-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2 × 0.2" (5.0 × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Deviation from this pad size increases thermal impedance and may reduce surge endurance-designers must follow the DO-214AC mounting layout in Figure 5 (Document 88390, page 5).
How does the peak pulse power rating of SMAJ120-E3/61 change with voltage?
SMAJ120-E3/61 is rated for 400 W peak pulse power with a 10/1000 µs waveform at VWM ≤ 78 V; above 78 V-including SMAJ120-E3/61's 120 V rating-the derated value is 300 W. This reduction reflects thermal limitations at higher standoff voltages and is explicitly noted in the "PRIMARY CHARACTERISTICS" table and "MAXIMUM RATINGS" section of the datasheet.
SMAJ120-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 214V
- Current - Peak Pulse (10/1000µs):
- 1.4A
- 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)
SMAJ120-E3/61 FAQ
1.How can I place an order for SMAJ120-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120-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 SMAJ120-E3/61 reliable?
The price and inventory of SMAJ120-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 SMAJ120-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ120-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120-E3/61?
SMAJ120-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120-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 SMAJ120-E3/61?
For technical support, including SMAJ120-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120-E3/61 requirements.
6.How does Aetrix verify that SMAJ120-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ120-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 SMAJ120-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ120-E3/61?
All SMAJ120-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120-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 SMAJ120-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ120-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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