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Vishay General Semiconductor - Diodes Division SMAJ7.5A-E3/5A
- Part No.:
- SMAJ7.5A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5A-E3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,314
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Product details
Overview
SMAJ7.5A-E3/5A 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 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA test current, and clamps up to 12.9 V at 31.0 A peak pulse current (IPPM) under 10/1000 μs waveform.
For engineers reviewing the SMAJ7.5A-E3/5A datasheet, SMAJ7.5A-E3/5A pinout, SMAJ7.5A-E3/5A application, or SMAJ7.5A-E3/5A equivalent, key selection considerations include its 400 W peak pulse power rating (at ≤78 V), low 0.067 %/°C temperature coefficient of VBR, and AEC-Q101 qualification eligibility via HE3/HM3 variants - critical for automotive and industrial surge protection design.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, with cathode marked by a band on the SMA package. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, ensuring effective suppression of ESD and fast-rising transients on DC power rails and signal lines.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 16750-2 (automotive electrical load dump), and is rated for operation from –55 °C to +150 °C junction temperature. Its MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.5 V - Maximum continuous reverse operating voltage before significant leakage; sets threshold for clamping activation on 5 V–12 V supply rails. |
| VBR (Breakdown Voltage) | 8.33–9.21 V at 1.0 mA - Confirmed minimum/maximum breakdown range ensures reliable turn-on margin above VWM without premature conduction. |
| VC (Clamping Voltage) | 12.9 V at 31.0 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; enables safe operation of 12 V logic and MOSFET gate drivers. |
| PPPM (Peak Pulse Power) | 400 W - Sustains single 10/1000 μs transients up to 31 A; derates to 300 W above 78 V per spec, but fully applicable at this 7.5 V variant. |
| IPPM (Peak Pulse Current) | 31.0 A - Measured surge current capability at VC; defines maximum transient energy absorption without failure. |
| TJmax | +150 °C - Enables use in under-hood automotive modules and industrial power supplies with high ambient thermal stress. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB layout requirements for sustained power dissipation. |
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 is marked by a band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line (e.g., VIN or signal); conducts when transient exceeds VBR, shunting current to ground. |
| Anode (unbanded end) | Ground reference terminal | Typically tied to system ground plane; must be low-inductance path to handle 31 A surge current without voltage overshoot. |
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 on 12 V systems without derating. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage stress on downstream ICs - e.g., keeps 12 V microcontroller I/O within safe 12.9 V limit. |
| 0.067 %/°C VBR tempco | Ensures stable breakdown threshold across automotive temperature range (–40 °C to +125 °C ambient). |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without pre-baking or special handling. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are qualified for automotive applications including engine control units and ADAS sensors. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and chassis ground. Use Value: Limits voltage to ≤12.9 V during 31 A surges, preventing damage to LDOs and CAN transceivers downstream. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on 4–20 mA or 0–10 V output lines. Use Value: Clamps fast ESD events (<1 ns rise) without distorting millivolt-level sensor signals due to minimal leakage (<100 μA at 7.5 V). |
| Consumer USB Power Input Protection | Telecom DC Feeder Protection |
Use Scenario: Safeguarding USB-C PD input stages in portable medical devices against hot-plug transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCONN/VBUS rail upstream of buck converter. Use Value: Withstands repeated 400 W pulses while maintaining <100 nA leakage at 5 V, preserving standby power budget. |
Use Scenario: Protecting -48 V DC power feeds in telecom base station remote radio units. IC Role / Device Role / Timing Role: Standoff-rated TVS on feed line entering RF amplifier module. Use Value: 7.5 V VWM allows use in auxiliary bias rails; 12.9 V clamping prevents latch-up in GaN FET drivers during lightning-induced surges. |
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-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU industrial equipment). | Direct material substitution when halogen-free certification is required; same footprint and thermal performance. |
| SMBJ7.5A-E3/52 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM, RθJA = 80 °C/W. | Higher surge capacity and better thermal dissipation; suited for higher-reliability or higher-duty-cycle applications. | Choose when surge repetition rate exceeds 0.01 % duty cycle or board space permits larger footprint for improved long-term reliability. |
Compared with SMAJ7.5A-E3/5A, the M3 variant offers identical protection performance with halogen-free construction, while SMBJ7.5A-E3/52 trades compactness for 50 % higher pulse power and lower thermal resistance - enabling extended surge endurance in demanding telecom or industrial environments.
Availability
SMAJ7.5A-E3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer USB power inputs, and telecom DC feeder circuits requiring stable component supply and full traceability.
Supply support for SMAJ7.5A-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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for cost-effective, high-speed transient suppression in space-constrained applications - targeting automotive, industrial, and consumer electronics where robustness and AEC-Q101 readiness are essential.
FAQ
What is the maximum clamping voltage of the SMAJ7.5A-E3/5A under standard test conditions?
The SMAJ7.5A-E3/5A has a maximum clamping voltage (VC) of 12.9 V at 31.0 A peak pulse current, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ7.5A-E3/5A maintains this clamping performance with minimal degradation over its rated lifetime when operated within datasheet limits.
Is the SMAJ7.5A-E3/5A suitable for automotive applications?
The SMAJ7.5A-E3/5A itself is commercial-grade, but Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ7.5AHE3_A/I). These variants undergo rigorous stress testing for automotive use, including temperature cycling, humidity bias, and surge endurance. For non-qualified designs, the SMAJ7.5A-E3/5A may be used in less critical automotive subsystems, though formal qualification requires the HE3/HM3 part numbers. Always verify qualification status via the full ordering code.
How does the SMAJ7.5A-E3/5A differ from bidirectional TVS diodes like SMAJ7.5CA?
The SMAJ7.5A-E3/5A is unidirectional and functions only in reverse bias, with polarity indicated by a cathode band; it blocks forward current like a standard diode. In contrast, SMAJ7.5CA is bidirectional and symmetrical, suppressing transients in both directions - ideal for AC lines or differential data buses. The SMAJ7.5A-E3/5A offers lower leakage (<100 μA at 7.5 V) and is preferred for DC power rail protection, whereas SMAJ7.5CA exhibits matched VBR in both polarities but higher leakage in some configurations.
What is the thermal resistance and how does it affect PCB layout for the SMAJ7.5A-E3/5A?
The SMAJ7.5A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means each watt of steady-state power raises junction temperature by 120 °C above ambient. Since the device handles only transient power (not continuous), layout focus should prioritize low-inductance ground paths and adequate copper area to absorb surge energy - not continuous heat sinking. The SMAJ7.5A-E3/5A's RθJL of 30 °C/W further emphasizes the need for solid thermal connection to leads.
Can the SMAJ7.5A-E3/5A be used in parallel for higher surge current handling?
No - the SMAJ7.5A-E3/5A is not recommended for parallel operation due to parameter mismatch (e.g., VBR tolerance ±5 %) causing uneven current sharing and potential thermal runaway. Vishay specifies single-device operation only. For higher surge ratings, select a higher-power variant such as SMBJ7.5A-E3/52 (600 W) or SMCJ7.5A-E3/57 (1500 W), which maintain the same VWM and VC while offering increased IPPM and thermal robustness. The SMAJ7.5A-E3/5A must be applied as a single-device solution per protected node.
SMAJ7.5A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5A-E3/5A FAQ
1.How can I place an order for SMAJ7.5A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5A-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 SMAJ7.5A-E3/5A reliable?
The price and inventory of SMAJ7.5A-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 SMAJ7.5A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5A-E3/5A?
SMAJ7.5A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5A-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 SMAJ7.5A-E3/5A?
For technical support, including SMAJ7.5A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5A-E3/5A requirements.
6.How does Aetrix verify that SMAJ7.5A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5A-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 SMAJ7.5A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5A-E3/5A?
All SMAJ7.5A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5A-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 SMAJ7.5A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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