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Vishay General Semiconductor - Diodes Division SMAJ7.5-E3/5A
- Part No.:
- SMAJ7.5-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5-E3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 14.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,459
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Product details
Overview
SMAJ7.5-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 7.5 V stand-off voltage (VWM), 8.33–10.2 V breakdown voltage (VBR at 1.0 mA), 14.3 V maximum clamping voltage (VC) at 28.0 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 control systems.
For engineers reviewing the SMAJ7.5-E3/5A datasheet, SMAJ7.5-E3/5A pinout, SMAJ7.5-E3/5A application, or SMAJ7.5-E3/5A equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC mechanical data, clamping performance under standardized surge conditions, RoHS-compliant commercial-grade construction, and direct alternative part comparisons for ESD and lightning transient protection design.
Technical Context
The SMAJ7.5-E3/5A operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1 ps) to transient overvoltages. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, enabling precise clamping within 14.3 V at rated 28.0 A surge current.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets MSL level 1 per J-STD-020, with matte tin-plated leads solderable per J-STD-002 and JESD22-B102, and passes JESD201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below breakdown. |
| VBR (min/max) | 8.33 V / 10.2 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering across manufacturing tolerance. |
| VC @ IPPM | 14.3 V at 28.0 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush and fault-current immunity. |
| Junction Temp Range | –55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Leakage Current | <1.0 µA at VWM - Minimal standby power loss and signal integrity impact in high-impedance sensing paths. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case meeting UL 94 V-0 flammability rating. Cathode identified by a single band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point (unidirectional operation) | Connected to protected line side; conducts only during reverse transient clamping when cathode is held at higher potential. |
| Cathode | Reverse-biased terminal with band marking | Connected to ground or reference rail; establishes clamping path during overvoltage events on anode-side traces. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics over temperature and lifetime; eliminates parameter drift in harsh environments. |
| 400 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics. |
| Low clamping ratio (VC/VWM = 1.91) | Minimizes voltage overshoot during transients - critical for safeguarding 5 V and 3.3 V logic-level components. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; reduces production risk and cost in high-volume assembly. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets global environmental regulations; suitable for consumer, computing, and non-automotive industrial applications. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load-dump spikes (up to 120 V) and alternator ripple on 12 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach LDOs and microcontrollers. Use Value: Limits rail voltage to ≤14.3 V during 28 A surge, preventing latch-up or permanent damage to 5 V tolerant CAN transceivers and LIN drivers. |
Use Scenario: Shields analog output lines of pressure/temperature sensors from ESD and switching noise in PLC I/O modules. IC Role / Device Role / Timing Role: Placed in series with 4–20 mA loop or parallel to 0–10 V output, referenced to system ground. Use Value: Sub-µA leakage preserves measurement accuracy; 14.3 V clamping prevents op-amp input stage breakdown during 8 kV contact ESD events. |
| Consumer USB Port Surge Protection | Telecom DC Power Input Protection |
|
Use Scenario: Guards VBUS line in USB 2.0 host ports against hot-plug transients and cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBUS and GND, upstream of USB switch or controller. Use Value: Responds in <1 ps to limit VBUS overshoot to 14.3 V - maintaining USB specification compliance while protecting 5 V tolerant PHYs. |
Use Scenario: Protects -48 V telecom power inputs from lightning-induced surges on central office or remote radio head equipment. IC Role / Device Role / Timing Role: Configured in unidirectional mode with cathode tied to -48 V rail and anode to input feed, clamping positive transients to ground. Use Value: Withstands 400 W pulses without degradation; enables compact placement near connectors due to DO-214AC footprint and thermal resistance specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/5A | Lower VBR range (8.33–9.21 V), tighter tolerance; 12.9 V clamping at 31.0 A; same package and RoHS grade. | Better suited for designs requiring lower trigger threshold and reduced clamping voltage - e.g., 3.3 V logic rails with tighter margins. | Select SMAJ7.5A-E3/5A when VBR consistency and sub-13 V clamping are prioritized over absolute peak power handling. |
| SMBJ7.5-E3/52 | DO-214AA (SMB) package; 600 W PPPM; 13.4 V VC at 43.3 A; identical VWM/VBR specs but larger footprint and higher thermal mass. | Preferred where higher surge endurance or board-level reliability margin is required, such as outdoor base stations or EV charging controllers. | Choose SMBJ7.5-E3/52 only if layout allows larger pad area and thermal dissipation needs exceed SMAJ7.5-E3/5A's 400 W rating. |
Compared with SMAJ7.5A-E3/5A, the SMAJ7.5-E3/5A offers higher clamping voltage but broader VBR tolerance - advantageous for cost-sensitive, high-volume consumer designs. Against SMBJ7.5-E3/52, it trades surge capacity for space savings and lower assembly cost in space-constrained PCBs.
Availability
SMAJ7.5-E3/5A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor signal conditioning, and telecom DC input stages requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ7.5-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 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 surface-mount power and signal line applications, targeting automotive, industrial, and communications systems where compact size and consistent clamping performance are critical.
FAQ
What is the maximum clamping voltage of the SMAJ7.5-E3/5A under standard test conditions?
The SMAJ7.5-E3/5A exhibits a maximum clamping voltage (VC) of 14.3 V when subjected to its rated peak pulse current of 28.0 A using the 10/1000 µs waveform. This value is measured at TA = 25 °C on specified 0.2 × 0.2 inch copper pads and defines the upper voltage limit imposed on protected circuits during surge events.
Is the SMAJ7.5-E3/5A suitable for bi-directional transient protection?
No - the SMAJ7.5-E3/5A is a unidirectional TVS diode, indicated by absence of "C" or "CA" suffix and confirmed by its single cathode band marking. For bi-directional operation, use SMAJ7.5CA-E3/5A, which provides symmetrical clamping in both polarities and omits polarity marking.
What does the "E3/5A" suffix indicate in SMAJ7.5-E3/5A?
The "E3" denotes RoHS-compliant, commercial-grade construction per JESD201 Class 1A whisker testing; "/5A" specifies packaging in 13-inch diameter plastic tape and reel containing 7500 units - optimized for high-speed pick-and-place assembly in volume manufacturing.
How does the thermal resistance of SMAJ7.5-E3/5A affect PCB layout?
With RθJA = 120 °C/W and RθJL = 30 °C/W, effective heat dissipation requires adherence to Vishay's recommended 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pad layout per terminal. Reducing pad area increases junction temperature rise, potentially derating surge capability and shortening device life under repetitive stress.
Can SMAJ7.5-E3/5A be used in automotive applications requiring AEC-Q101 qualification?
No - SMAJ7.5-E3/5A carries the commercial-grade E3 suffix. For AEC-Q101 qualified automotive use, select SMAJ7.5HE3/5A (or SMAJ7.5CAHE3/5A for bi-directional), which undergoes additional stress testing and is marked with "HE3" to denote high-reliability, automotive-grade qualification.
SMAJ7.5-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SMAJ7.5-E3/5A FAQ
1.How can I place an order for SMAJ7.5-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5-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 SMAJ7.5-E3/5A reliable?
The price and inventory of SMAJ7.5-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 SMAJ7.5-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5-E3/5A?
SMAJ7.5-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5-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 SMAJ7.5-E3/5A?
For technical support, including SMAJ7.5-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5-E3/5A requirements.
6.How does Aetrix verify that SMAJ7.5-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5-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 SMAJ7.5-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5-E3/5A?
All SMAJ7.5-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5-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 SMAJ7.5-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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