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Vishay General Semiconductor - Diodes Division SMAJ7.5A-E3/61
- Part No.:
- SMAJ7.5A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5A-E3/61.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.5A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on DC power rails and signal lines. 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 to ≤12.9 V at 31.0 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5A-E3/61 datasheet, SMAJ7.5A-E3/61 pinout, SMAJ7.5A-E3/61 application, or SMAJ7.5A-E3/61 equivalent, key selection criteria include unidirectional polarity, 400 W peak pulse power rating (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.55), RoHS-compliant matte tin terminals, and MSL Level 1 moisture sensitivity per J-STD-020.
Technical Context
This TVS diode operates as a voltage-clamping protection device, leveraging an avalanche junction to divert transient energy away from sensitive downstream circuitry. Its unidirectional configuration provides forward conduction only during reverse overvoltage events, with cathode band marking indicating polarity.
It delivers 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that threshold, and exhibits 0.067 %/°C temperature coefficient of VBR - ensuring stable clamping across -55 °C to +150 °C operating junction range. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse working voltage before clamping begins; sets safe operating margin below system rail. |
| VBR min/max | 8.33 V / 9.21 V at 1.0 mA - defines guaranteed avalanche onset window; ensures consistent triggering across production lots. |
| VC @ IPPM | 12.9 V at 31.0 A - clamped voltage during worst-case surge; determines maximum stress imposed on protected ICs. |
| PPPM | 400 W (10/1000 μs) - peak transient energy handling capacity; validates suitability for IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | 100 μA - reverse leakage at rated stand-off; low enough to avoid measurable power loss or false triggering in battery-powered sensors. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 120 °C/W - thermal resistance on standard PCB pad layout; informs heatsinking requirements for repetitive surge duty cycles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during overvoltage event. |
| Cathode | Protected line connection / avalanche terminal | Connected to the line being protected (e.g., 5 V rail, CAN_H); conducts reverse avalanche current when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 combination wave surges without derating in most board-level layouts. |
| Low clamping voltage (VC = 12.9 V) | Provides 71 % clamping ratio (VC/VBR avg), minimizing voltage overshoot on 5 V–12 V logic and power rails. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking; eliminates moisture-related popcorning risk. |
| Glass passivated junction | Ensures long-term reliability and stable VBR drift under thermal cycling and humidity exposure. |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 for automotive-grade supply chains. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 5 V microcontroller supply lines in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between VCC and GND, activated within <1 ns of overvoltage onset. Use Value: Limits transient voltage to ≤12.9 V, preventing latch-up or gate oxide damage in 5 V logic ICs during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding analog output pins of pressure sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA current loop outputs, absorbing ESD and inductive kickback. Use Value: Maintains 7.5 V stand-off while clamping 31 A surges to 12.9 V, preserving sensor accuracy and avoiding ADC saturation. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-level protection on USB VBUS lines after primary polymer PTC, guarding against contact ESD per IEC 61000-4-2 ±15 kV. IC Role / Device Role / Timing Role: Fast-response TVS shunting ESD current to ground before it reaches USB controller PHY. Use Value: Sub-13 V clamping ensures USB 2.0 PHY (VDDIO = 3.3 V) remains within absolute maximum ratings despite ±15 kV air discharge. |
Use Scenario: Front-end protection on Ethernet PHY power rails (3.3 V or 5 V) in VoIP gateways subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge diverter on DC bias lines feeding PoE-powered PHYs, coordinated with gas discharge tubes. Use Value: 400 W rating handles partial energy from 10/700 μs telecom surges; low VBR tolerance enables precise coordination with upstream protectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-M3/61 | 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 public infrastructure projects). | Choose SMAJ7.5A-M3/61 when halogen-free materials are required by procurement policy or end-equipment certification. |
| SMAJ7.5AHE3_A/H | AEC-Q101 qualified version with same VWM, VBR, and VC; validated for automotive under-hood use. | Approved for automotive safety-critical subsystems (e.g., ADAS power domains) requiring AEC-Q101 qualification. | Specify SMAJ7.5AHE3_A/H for automotive OEM designs requiring formal AEC-Q101 qualification evidence and traceable lot data. |
Compared with SMAJ7.5A-M3/61 and SMAJ7.5AHE3_A/H, the SMAJ7.5A-E3/61 offers commercial-grade RoHS compliance without halogen restrictions or automotive qualification - making it optimal for cost-sensitive industrial and consumer applications where those extended certifications are unnecessary.
Availability
SMAJ7.5A-E3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, consumer USB port ESD mitigation, and telecom line card surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ7.5A-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, power efficiency, and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where fast response, stable clamping, and AEC-Q101 readiness are critical design requirements.
FAQ
What is the clamping voltage of the SMAJ7.5A-E3/61 under a 10/1000 μs surge?
The SMAJ7.5A-E3/61 clamps to a maximum of 12.9 V at its rated peak pulse current of 31.0 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case clamping performance across temperature and process variation - critical for verifying headroom on 5 V or 12 V protected rails.
Is the SMAJ7.5A-E3/61 suitable for automotive applications?
The SMAJ7.5A-E3/61 is RoHS-compliant and rated for -55 °C to +150 °C operation, but it is not AEC-Q101 qualified. For automotive use, Vishay offers the SMAJ7.5AHE3_A/H variant - identical electrically but fully qualified per AEC-Q101. The SMAJ7.5A-E3/61 remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated.
How does the SMAJ7.5A-E3/61 differ from bidirectional SMAJ7.5CA variants?
The SMAJ7.5A-E3/61 is unidirectional with cathode band marking and conducts only in reverse avalanche; the SMAJ7.5CA is bidirectional with no polarity marking and clamps symmetrically in both directions. Their VWM (7.5 V), VBR (8.33–9.21 V), and VC (12.9 V) match, but SMAJ7.5A-E3/61 must be oriented correctly on PCB, whereas SMAJ7.5CA simplifies layout for AC-coupled or differential lines.
What is the maximum leakage current of the SMAJ7.5A-E3/61 at its rated stand-off voltage?
At its 7.5 V stand-off voltage (VWM), the SMAJ7.5A-E3/61 exhibits a maximum reverse leakage current (ID) of 100 μA at 25 °C. This low leakage ensures minimal impact on battery life in portable equipment and avoids false triggering in high-impedance sensor bias networks.
Does the SMAJ7.5A-E3/61 require heatsinking for typical surge duty cycles?
For single-event transients (e.g., ESD or lightning-induced surges), no external heatsink is needed - the SMAJ7.5A-E3/61 dissipates energy internally. However, under repetitive surge conditions (>0.01 % duty cycle), thermal management becomes critical; its RθJA of 120 °C/W means ≥1 cm² of 2 oz copper per terminal is recommended to maintain TJ < 150 °C.
SMAJ7.5A-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):
- 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-E3/61 FAQ
1.How can I place an order for SMAJ7.5A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5A-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 SMAJ7.5A-E3/61 reliable?
The price and inventory of SMAJ7.5A-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 SMAJ7.5A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5A-E3/61?
SMAJ7.5A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5A-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 SMAJ7.5A-E3/61?
For technical support, including SMAJ7.5A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5A-E3/61 requirements.
6.How does Aetrix verify that SMAJ7.5A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5A-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 SMAJ7.5A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5A-E3/61?
All SMAJ7.5A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5A-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 SMAJ7.5A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.5A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5A-E3/61 Tags
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