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Vishay General Semiconductor - Diodes Division SMAJ75A-E3/61
- Part No.:
- SMAJ75A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75A-E3/61.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
SMAJ75A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and telecom power supplies.
For engineers reviewing the SMAJ75A-E3/61 datasheet, SMAJ75A-E3/61 pinout, SMAJ75A-E3/61 application, or SMAJ75A-E3/61 equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification eligibility (via HE3 suffix), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance to low-impedance state within <1 ps when reverse voltage exceeds VBR, diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable leakage (<1 μA at 75 V) and repeatable breakdown behavior across temperature (-55 °C to +150 °C).
The SMAJ75A-E3/61 delivers 400 W peak pulse power up to 78 V and derates to 300 W above 78 V per Fig. 2; its 30 °C/W junction-to-lead thermal resistance supports reliable operation under repetitive surge conditions when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail protection threshold. |
| VBR (min/max) | 83.3 V / 92.1 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 121 V at 3.3 A - Clamped voltage seen by downstream ICs during 10/1000 μs surge; limits stress on 100 V-rated components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capability with standard lightning/inductive-switching waveform. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms), supporting protection against motor commutation spikes and load dump events. |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments and sealed industrial enclosures. |
| RθJA | 120 °C/W - Thermal resistance defining required PCB copper area (0.2" × 0.2") for sustained power dissipation without overheating. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge current return path | Connected to ground or low-impedance return plane; must handle full IPPM during clamping event. |
| Cathode | Protected line connection / Surge current sink | Connected to line being protected (e.g., 75 V supply rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 75 V systems without cascaded stages. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure in automotive and industrial settings. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free reflow soldering without popcorn effect or delamination; compatible with standard SMT assembly lines. |
| AEC-Q101 qualification option (HE3 suffix) | Validates reliability for automotive applications including engine control, body electronics, and ADAS power domains. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD, relay bounce), improving protection margin for sensitive analog front-ends. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 75 V battery-fed control modules (e.g., HVAC actuators, seat motor drivers) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power input and upstream DC/DC converter input. Use Value: Limits transient voltage to ≤121 V, preventing damage to 100 V-rated MOSFETs and gate drivers while surviving 40 A surge currents. |
Use Scenario: Safeguarding 24–75 V analog sensor outputs (e.g., pressure, temperature transmitters) connected to PLC analog inputs. IC Role / Device Role / Timing Role: Line-side transient suppressor installed at connector entry point before signal conditioning circuitry. Use Value: Clamps induced surges from nearby motor switching to <121 V within <1 ps, preserving 16-bit ADC accuracy and avoiding latch-up in op-amps. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Securing 48–75 V PoE++ or remote radio unit (RRU) power inputs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage, coordinated with upstream fuse and secondary filtering. Use Value: Absorbs 400 W surge energy without degradation, maintaining system uptime in harsh outdoor deployments per IEC 61000-4-5. |
Use Scenario: Adding secondary-side surge immunity to 75 V output of high-power laptop/monitor adapters exposed to user-handling ESD. IC Role / Device Role / Timing Role: Final-stage TVS on output connector, shunting fast transients before reaching end-device USB-PD or display interface. Use Value: Provides sub-100 ns response to ±8 kV contact ESD (IEC 61000-4-2), limiting voltage excursion to safe levels for downstream USB-C controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and clamping performance. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental requirements. | Choose SMAJ75A-M3/61 for green manufacturing programs requiring halogen-free bill-of-materials. |
| SMAJ75AHE3_A/61 | AEC-Q101 qualified version with enhanced reliability testing (HTOL, TC, UHAST); otherwise identical VWM, VC, and PPPM. | Required for automotive safety-critical modules where component qualification beyond commercial grade is mandatory. | Specify SMAJ75AHE3_A/61 for automotive designs needing documented AEC-Q101 conformance and extended lifetime validation. |
Compared with SMAJ75A-M3/61 and SMAJ75AHE3_A/61, the SMAJ75A-E3/61 provides baseline RoHS compliance and commercial-grade reliability - optimal for industrial and telecom applications where halogen-free or automotive qualification are not required, reducing cost and simplifying sourcing without sacrificing core protection performance.
Availability
SMAJ75A-E3/61 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and telecom DC input protection requiring stable component supply, consistent tape-and-reel delivery, and long-term lifecycle support.
Supply support for SMAJ75A-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 communications systems where robustness against inductive switching and lightning surges is critical.
FAQ
What is the maximum clamping voltage of the SMAJ75A-E3/61 under standard surge conditions?
The SMAJ75A-E3/61 exhibits a maximum clamping voltage (VC) of 121 V when subjected to its rated peak pulse current of 3.3 A using the 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 100 V-rated downstream components in 75 V systems.
Is the SMAJ75A-E3/61 suitable for automotive applications?
The SMAJ75A-E3/61 itself is a commercial-grade part, but Vishay offers the functionally identical SMAJ75AHE3_A/61 variant qualified to AEC-Q101. For automotive use, engineers should specify the HE3 suffix version; the SMAJ75A-E3/61 may be used in non-safety-critical aftermarket or infotainment subsystems where formal qualification is not mandated, though design validation remains the customer's responsibility.
What does the "-E3/61" suffix indicate in SMAJ75A-E3/61?
The "-E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/61" specifies packaging in 7-inch plastic tape-and-reel format containing 1800 units. This ordering code ensures compatibility with standard SMT pick-and-place equipment and aligns with Vishay's preferred packaging for high-volume automated assembly of the SMAJ75A-E3/61.
How does the thermal performance of SMAJ75A-E3/61 affect PCB layout?
The SMAJ75A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, which requires mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to sustain its 3.3 W power dissipation rating. Inadequate copper area will cause excessive junction temperature rise during repetitive surges, degrading clamping consistency and long-term reliability of the SMAJ75A-E3/61.
Can SMAJ75A-E3/61 be used in bidirectional configurations?
No - SMAJ75A-E3/61 is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. For bidirectional protection at 75 V, the correct part is SMAJ75CA (e.g., SMAJ75CA-E3/61), which features symmetrical breakdown in both directions and no polarity marking. Using SMAJ75A-E3/61 in reverse-biased AC or floating applications risks permanent failure due to forward conduction during negative half-cycles.
SMAJ75A-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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ75A-E3/61 FAQ
1.How can I place an order for SMAJ75A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75A-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 SMAJ75A-E3/61 reliable?
The price and inventory of SMAJ75A-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 SMAJ75A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ75A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75A-E3/61?
SMAJ75A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75A-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 SMAJ75A-E3/61?
For technical support, including SMAJ75A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75A-E3/61 requirements.
6.How does Aetrix verify that SMAJ75A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ75A-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 SMAJ75A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ75A-E3/61?
All SMAJ75A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75A-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 SMAJ75A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ75A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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