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Vishay General Semiconductor - Diodes Division SMAJ120A-E3/61
- Part No.:
- SMAJ120A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120A-E3/61.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
SMAJ120A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) 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), 133–147 V breakdown voltage (VBR) at 1 mA test current, and clamps up to 193 V at 1.6 A peak pulse current (IPPM) under 10/1000 μs waveform.
For engineers reviewing the SMAJ120A-E3/61 datasheet, SMAJ120A-E3/61 pinout, SMAJ120A-E3/61 application, or SMAJ120A-E3/61 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, and compliance with AEC-Q101 for automotive-grade reliability when ordered as HE3 variant.
Technical Context
This TVS diode operates as a voltage-clamping protection device placed in parallel with the circuit node it safeguards. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping behavior during repetitive 10/1000 μs transients up to 400 W peak pulse power (derated to 300 W above 78 V).
The SMAJ120A-E3/61 is rated for -55 °C to +150 °C operating junction temperature, with 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient. Its unidirectional configuration requires correct cathode-band orientation-cathode marked with band-and exhibits 1.0 μA max reverse leakage at 120 V stand-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant conduction begins; sets upper limit of normal operating range. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system overvoltage tolerance. |
| VC (Clamping Voltage) | 193 V at IPPM = 1.6 A - Peak voltage seen by protected circuit during specified transient; must be below downstream IC's absolute max rating. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy handling capacity; derates to 300 W above 78 V per datasheet fig. 1. |
| ID (Reverse Leakage) | ≤1.0 μA at 120 V - Minimal standby current draw; avoids signal integrity degradation or battery drain in always-on circuits. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area (0.2" × 0.2") for safe power dissipation. |
| Polarity | Unidirectional - Cathode marked with band; blocks forward conduction unless used in DC-biased protection paths. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Molding compound meets UL 94 V-0. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; forms clamping path when transient exceeds VBR. |
| Cathode | High-side connection point | Marked with band; connected to protected line (e.g., 120 V supply rail or signal); conducts during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without derating in standard layouts. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress per JESD22-A101. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination. |
| AEC-Q101 qualified option (HE3 suffix) | Validated for automotive powertrain and body electronics where failure modes require zero-defect reliability. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), critical for protecting high-speed interfaces. |
Applications
| Automotive Power Distribution | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 120 V DC bus lines in vehicle body control modules from load-dump spikes and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across bus rail and chassis ground to shunt surge energy before reaching MCU power pins. Use Value: Clamps transients to ≤193 V, maintaining margin below 200 V-rated DC-DC converters and ensuring ASIL-B functional safety compliance. |
Use Scenario: Safeguarding 24–120 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each optocoupler input line to prevent false triggering or LED damage. Use Value: Sub-μA leakage at 120 V prevents false logic states in high-impedance sensing circuits while surviving repeated 1 kV ring-wave tests. |
| Telecom Line Interface | Renewable Energy Monitoring |
Use Scenario: Shielding RS-485 transceivers and isolation amplifiers in base station remote radio units from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on differential pair lines referenced to local ground plane. Use Value: 193 V clamping limits stress on ±12 V transceiver rails, preserving signal integrity and meeting ITU-T K.21 heavy-duty protection requirements. |
Use Scenario: Protecting voltage-sense inputs on solar inverter string monitors operating at up to 120 V DC string voltage. IC Role / Device Role / Timing Role: Front-end clamping element before precision ADC input stage to prevent latch-up or ESD damage. Use Value: 1.0 μA max leakage avoids measurement offset errors in 16-bit analog front-ends; RoHS-compliant E3 suffix supports green manufacturing mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and thermal performance. | Required for halogen-free BOM compliance in EU industrial equipment and medical devices. | Select when regulatory compliance mandates halogen-free materials without sacrificing surge rating or footprint. |
| SMAJ120AHE3_A | AEC-Q101 qualified version with extended reliability testing (HTOL, TC, UHAST); same VWM, VBR, VC, and package. | Qualified for automotive under-hood applications where temperature cycling and vibration endurance are mandatory. | Choose for automotive OEM designs requiring PPAP documentation and zero-defect field performance. |
Compared with SMAJ120A-E3/61, the M3 variant adds halogen-free compliance without altering electrical behavior, while the HE3 variant provides full AEC-Q101 qualification-making it suitable for automotive use cases where the base E3 part is restricted to commercial/industrial environments.
Availability
SMAJ120A-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC input protection, telecom line interface, and renewable energy monitoring requiring stable component supply and consistent RoHS-compliant sourcing.
Supply support for SMAJ120A-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 is engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and telecom systems where fast clamping and repeatable surge immunity are critical.
FAQ
What is the clamping voltage of SMAJ120A-E3/61 at its rated peak pulse current?
The SMAJ120A-E3/61 has a maximum clamping voltage (VC) of 193 V at 1.6 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events, ensuring compatibility with 200 V-rated downstream components.
Is SMAJ120A-E3/61 suitable for automotive applications?
The SMAJ120A-E3/61 itself is commercial-grade and not AEC-Q101 qualified; however, the functionally identical SMAJ120AHE3_A variant is fully AEC-Q101 qualified. For automotive use, specify the HE3 suffix to ensure qualification for temperature cycling, humidity testing, and long-term reliability in under-hood environments.
How does the unidirectional configuration of SMAJ120A-E3/61 affect circuit placement?
The SMAJ120A-E3/61 is unidirectional and marked with a cathode band. It must be oriented with the cathode toward the protected line (e.g., 120 V rail) and anode to ground. Incorrect orientation prevents clamping during positive transients and may cause catastrophic failure under reverse bias beyond VWM.
What PCB layout guidance applies to SMAJ120A-E3/61 for optimal thermal performance?
For rated 400 W pulse power handling, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases RθJA and risks thermal runaway during repetitive surges; minimum trace width should be ≥0.5 mm to sustain 40 A IFSM surge current without fusing.
Does SMAJ120A-E3/61 meet lead-free reflow requirements?
Yes, SMAJ120A-E3/61 meets J-STD-020 MSL Level 1 with a maximum peak reflow temperature of 260 °C, supporting standard lead-free soldering processes. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102, and it passes JESD201 Class 2 whisker testing.
SMAJ120A-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:
- 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-E3/61 FAQ
1.How can I place an order for SMAJ120A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120A-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 SMAJ120A-E3/61 reliable?
The price and inventory of SMAJ120A-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 SMAJ120A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ120A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120A-E3/61?
SMAJ120A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120A-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 SMAJ120A-E3/61?
For technical support, including SMAJ120A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120A-E3/61 requirements.
6.How does Aetrix verify that SMAJ120A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ120A-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 SMAJ120A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ120A-E3/61?
All SMAJ120A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120A-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 SMAJ120A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ120A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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