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Vishay General Semiconductor - Diodes Division SMAJ8.0A-E3/5A
- Part No.:
- SMAJ8.0A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0A-E3/5A.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
SMAJ8.0A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of sensitive ICs, MOSFETs, and signal lines. It features a 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA, 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive sensor interfaces and industrial I/O protection circuits.
For engineers reviewing the SMAJ8.0A-E3/5A datasheet, SMAJ8.0A-E3/5A pinout, SMAJ8.0A-E3/5A application, or SMAJ8.0A-E3/5A equivalent, key selection criteria include clamping performance under 29.4 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on DO-214AC footprints.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below 8.0 V and rapidly transitions to low-impedance conduction above its 8.89–9.83 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<50 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of ESD and inductive switching transients.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operation from –55 °C to +150 °C, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. Its 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design (0.2" × 0.2") to sustain 3.3 W steady-state dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 8.89 V / 9.83 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transient events. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; derates to 300 W above 78 V. |
| ID @ VWM | <50 μA - Low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max. | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments without derating. |
| RθJA | 120 °C/W - Requires minimum 5.0 mm × 5.0 mm copper pads per terminal to maintain thermal performance in sustained surge conditions. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional polarity marked by cathode band. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or common return path; forms current sink during transient clamping. |
| Cathode | Protected line input | Connected to signal/power line being protected; polarity band identifies this terminal on PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges in automotive and industrial applications. |
| 13.6 V clamping voltage at 29.4 A | Ensures downstream logic-level ICs (e.g., 3.3 V or 5 V microcontrollers) remain within absolute maximum ratings during surge events. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Glass passivated junction | Delivers stable VBR tolerance and low leakage across temperature and lifetime, critical for long-term reliability in harsh environments. |
| RoHS-compliant, halogen-free option available | Meets global environmental compliance requirements (e.g., EU RoHS Directive 2011/65/EU and JEDEC JS709E). |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and inductive kickback in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between signal line and chassis ground to divert transients before reaching IC pins. Use Value: Limits clamped voltage to 13.6 V, safeguarding 5 V tolerant transceivers and preserving signal fidelity during 400 W surge events. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminals, positioned upstream of optocoupler or Schmitt trigger input stages. Use Value: Withstands 29.4 A peak current while maintaining sub-14 V clamping, preventing false triggering and latch-up in industrial control logic. |
| Consumer USB Port ESD Protection | Telecom Power Line Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing ±8 kV HBM and ±15 kV air-gap ESD pulses per IEC 61000-4-2. Use Value: Sub-nanosecond response and <50 μA leakage ensure no impact on USB signal integrity or standby current consumption. |
Use Scenario: Front-end transient suppression on 48 V DC telecom power feeds entering base station equipment cabinets. IC Role / Device Role / Timing Role: First-stage crowbar element limiting surge voltage before downstream DC/DC converters and PMICs. Use Value: 400 W rating and 150 °C max junction temperature support repeated surge exposure in outdoor telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and DO-214AC package. | No functional difference; selected when halogen-free material compliance is required for end-product certification. | Choose SMAJ8.0A-M3/5A for IPC-1752A-compliant BOMs or markets requiring halogen-free declarations. |
| P6SMB8.0A | Same VWM (8.0 V) and VC (13.6 V), but SMB (DO-214AA) package; 600 W PPPM rating; higher RθJA (150 °C/W). | Requires larger PCB footprint and delivers higher clamping energy; suited for less space-constrained designs needing extra margin. | Choose P6SMB8.0A only if board layout allows SMB footprint and higher surge margin justifies thermal trade-offs. |
Compared with SMAJ8.0A-E3/5A, the SMAJ8.0A-M3/5A offers identical protection performance with halogen-free construction, while P6SMB8.0A provides higher pulse power at the cost of larger size and reduced thermal efficiency-making SMAJ8.0A-E3/5A optimal for compact, RoHS-aligned automotive and industrial SMT designs.
Availability
SMAJ8.0A-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer USB port protection, and telecom power line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ8.0A-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, precision, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems-delivering consistent clamping performance, AEC-Q101 qualification options, and robust SMT manufacturability.
FAQ
What is the clamping voltage of SMAJ8.0A-E3/5A at its rated peak pulse current?
The SMAJ8.0A-E3/5A exhibits a maximum clamping voltage (VC) of 13.6 V when subjected to its specified peak pulse current (IPPM) of 29.4 A under a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ8.0A-E3/5A maintains this clamping performance across its qualified operating temperature range.
Is SMAJ8.0A-E3/5A suitable for automotive applications?
Yes, SMAJ8.0A-E3/5A is suitable for automotive applications as a discrete transient suppressor, particularly in non-safety-critical subsystems such as body electronics, infotainment interfaces, and sensor signal conditioning. While the base SMAJ8.0A-E3/5A variant is commercial-grade, Vishay offers AEC-Q101-qualified versions (e.g., SMAJ8.0AHE3_X) for automotive-grade deployment. The SMAJ8.0A-E3/5A itself meets MSL Level 1 and operates from –55 °C to +150 °C, supporting under-dash and engine bay-adjacent placements where full AEC qualification is not mandated.
What does the "E3/5A" suffix indicate in SMAJ8.0A-E3/5A?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/5A" specifies the packaging format: 7500 units per 13-inch plastic tape-and-reel. This contrasts with "/61", which indicates 1800 units per 7-inch reel. The SMAJ8.0A-E3/5A therefore targets high-volume SMT production lines requiring large reels and environmental compliance, without halogen-free or automotive qualification requirements.
How does SMAJ8.0A-E3/5A compare to bidirectional TVS diodes like SMAJ8.0CA?
SMAJ8.0A-E3/5A is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., VCC-to-ground or signal-to-ground), offering lower leakage and tighter VBR tolerance. In contrast, SMAJ8.0CA is bidirectional and used on AC or floating lines (e.g., data pairs, antenna feeds), with symmetrical clamping in both directions. The SMAJ8.0A-E3/5A cannot substitute for SMAJ8.0CA in bidirectional applications due to its inherent polarity and lack of reverse conduction capability.
What PCB layout guidance applies to SMAJ8.0A-E3/5A for optimal thermal performance?
For optimal thermal performance, SMAJ8.0A-E3/5A must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. These pads act as heat sinks to manage its 120 °C/W junction-to-ambient thermal resistance. Avoid narrow traces or thermal reliefs between the device terminals and copper planes; direct connection to internal ground/power planes improves surge current handling and reduces clamping overshoot. The SMAJ8.0A-E3/5A's DO-214AC footprint requires precise stencil aperture design to ensure uniform solder paste deposition and void-free reflow.
SMAJ8.0A-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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- 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)
SMAJ8.0A-E3/5A FAQ
1.How can I place an order for SMAJ8.0A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0A-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 SMAJ8.0A-E3/5A reliable?
The price and inventory of SMAJ8.0A-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 SMAJ8.0A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0A-E3/5A?
SMAJ8.0A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0A-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 SMAJ8.0A-E3/5A?
For technical support, including SMAJ8.0A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0A-E3/5A requirements.
6.How does Aetrix verify that SMAJ8.0A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0A-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 SMAJ8.0A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0A-E3/5A?
All SMAJ8.0A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0A-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 SMAJ8.0A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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