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Vishay General Semiconductor - Diodes Division SMAJ75CA-E3/5A
- Part No.:
- SMAJ75CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA-E3/5A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,067
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Product details
Overview
SMAJ75CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ75CA-E3/5A datasheet, SMAJ75CA-E3/5A pinout, SMAJ75CA-E3/5A application, or SMAJ75CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 75 V), then rapidly avalanches below 121 V to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, enabling consistent clamping across repetitive 10/1000 μs transients at 0.01% duty cycle.
The SMAJ75CA-E3/5A is optimized for bidirectional protection - symmetric conduction in both polarities eliminates need for polarity-aware layout - and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin for 75 V nominal rails. |
| VBR (min/max) | 83.3 V / 92.1 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 121 V at 3.3 A - clamping voltage under 400 W 10/1000 μs surge; limits stress on protected ICs to ≤121 V. |
| PPPM | 400 W - peak pulse power handling with standard waveform; supports robust protection against IEC 61000-4-5 surges. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine); validates survivability during power-rail faults. |
| TJ max. | 150 °C - maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard SMT pick-and-place and reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (negative polarity) | Conducts during negative-going transients; connects to protected line or ground return path. |
| Cathode | Transient current sink (positive polarity) | Conducts during positive-going transients; connects to protected line or ground return path. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in automotive load-dump and industrial switching noise. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to 75 V-rated components. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to reflow; supports direct placement from dry pack into production. |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring qualified TVS devices. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 75 V battery-fed control modules (e.g., body ECUs, lighting drivers) from ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and chassis ground, responding within <1 ps to clamp spikes above 83.3 V. Use Value: Limits rail voltage excursion to ≤121 V during 100 V/500 ms load dump, preventing damage to 75 V-rated DC-DC controllers and gate drivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules exposed to field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping device across differential signal pairs or single-ended sensor supply lines. Use Value: Maintains signal integrity by suppressing ±1 kV ESD (IEC 61000-4-2) and ±0.5 kV burst noise (IEC 61000-4-4) without adding capacitance-induced distortion. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Front-end protection of PoE-powered line cards against lightning-induced surges on Ethernet data lines. IC Role / Device Role / Timing Role: Primary TVS element placed before Ethernet magnetics, clamping common-mode transients on twisted-pair inputs. Use Value: Withstands 400 W 10/1000 μs surges per IEC 61000-4-5, ensuring compliance with GR-1089-CORE telecom immunity requirements. |
Use Scenario: Secondary-side overvoltage protection in 75 V output AC/DC adapters for smart home hubs and security systems. IC Role / Device Role / Timing Role: Standoff-rated clamping device across output capacitor terminals to absorb regulator fault transients. Use Value: Prevents catastrophic failure of downstream 75 V-rated DC-DC stages during output short-circuit recovery or feedback loop instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-E3/5A | Unidirectional variant; cathode-marked; 121 V clamping same, but only conducts in one polarity. | Requires correct polarity orientation; unsuitable for AC or floating signals. | Select when protecting unidirectional DC rails where polarity is fixed and space allows explicit cathode alignment. |
| SMBJ75CA-E3/52 | Same VWM/VC, but SMB (DO-214AA) package: 5.28 mm × 4.50 mm vs. SMA's 4.93 mm × 3.99 mm; 600 W PPPM. | Higher power handling and larger pad area; less dense layout fit. | Choose when system-level surge testing exceeds 400 W or thermal dissipation requires lower RθJA (80 °C/W). |
Compared with SMAJ75CA-E3/5A, the unidirectional SMAJ75A-E3/5A demands strict polarity layout but offers identical clamping performance, while the SMBJ75CA-E3/52 provides 50% higher surge power at the cost of 30% larger PCB footprint - making SMAJ75CA-E3/5A optimal for space-constrained bidirectional 75 V rail protection.
Availability
SMAJ75CA-E3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom line card development requiring stable component supply and RoHS-compliant packaging.
Supply support for SMAJ75CA-E3/5A 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 supplier of discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-clamping transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMAJ75CA-E3/5A under a 400 W surge?
The SMAJ75CA-E3/5A clamps to a maximum of 121 V when subjected to its rated 400 W peak pulse power with a 10/1000 μs waveform. This occurs at a peak pulse current of 3.3 A, as specified in the Vishay datasheet Document Number 88390. The 121 V clamping voltage ensures protected circuits remain within safe operating limits during standardized surge events.
Is SMAJ75CA-E3/5A suitable for automotive applications?
SMAJ75CA-E3/5A itself is commercial-grade (RoHS-compliant, E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3/HM3 ordering codes (e.g., SMAJ75CAHE3_A/I). For production automotive use, specify the HE3 variant; the SMAJ75CA-E3/5A is appropriate for prototyping, industrial, or consumer designs where full qualification is not required.
How does SMAJ75CA-E3/5A differ from SMAJ75A-E3/5A?
SMAJ75CA-E3/5A is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMAJ75A-E3/5A is unidirectional with a cathode band and conducts only during positive transients. Both share identical VWM (75 V), VBR, and VC (121 V), but SMAJ75CA-E3/5A eliminates polarity-dependent layout concerns in AC or floating circuits.
What is the thermal resistance of SMAJ75CA-E3/5A?
The SMAJ75CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. These values assume standard PCB layout; actual thermal performance depends on board copper area and airflow.
Does SMAJ75CA-E3/5A require special handling for moisture sensitivity?
No - SMAJ75CA-E3/5A meets MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be placed directly from dry pack into reflow soldering without baking. Its maximum peak reflow temperature is 260 °C, fully compatible with standard lead-free assembly processes.
SMAJ75CA-E3/5A 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ75CA-E3/5A FAQ
1.How can I place an order for SMAJ75CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA-E3/5A 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 SMAJ75CA-E3/5A reliable?
The price and inventory of SMAJ75CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ75CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA-E3/5A?
SMAJ75CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA-E3/5A 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 SMAJ75CA-E3/5A?
For technical support, including SMAJ75CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ75CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA-E3/5A 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 SMAJ75CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ75CA-E3/5A?
All SMAJ75CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA-E3/5A, 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 SMAJ75CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ75CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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