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Vishay General Semiconductor - Diodes Division SMAJ8.0A-M3/5A
- Part No.:
- SMAJ8.0A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0A-M3/5A.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ8.0A-M3/5A 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 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA test current, and clamps up to 13.6 V at 29.4 A peak pulse current (IPPM) under 10/1000 μs waveform.
For engineers reviewing the SMAJ8.0A-M3/5A datasheet, SMAJ8.0A-M3/5A pinout, SMAJ8.0A-M3/5A application, or SMAJ8.0A-M3/5A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and 400 W peak pulse power capability at TA = 25 °C.
Technical Context
This TVS diode operates as a clamping device in parallel with the protected circuit node, entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while glass-passivated junction enhances reliability under repetitive surge stress.
The SMAJ8.0A-M3/5A is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and supports automated SMT placement due to its low-profile SMA package and matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.0 V - Maximum continuous reverse working voltage before clamping begins; must exceed normal signal/system rail voltage. |
| VBR (Breakdown Voltage) | 8.89–9.83 V at IT = 1 mA - Confirmed avalanche onset range; defines minimum overvoltage threshold for protection activation. |
| VC (Clamping Voltage) | 13.6 V at IPPM = 29.4 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines safe margin vs. IC absolute max rating. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capacity under standardized 10/1000 μs waveform; derates above 25 °C ambient. |
| ID (Reverse Leakage) | 50 μA max at VWM - Low leakage preserves signal integrity and power efficiency in standby or low-power modes. |
| RθJA | 120 °C/W - Thermal resistance dictates required PCB copper area and airflow for sustained surge duty cycles. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction, clamps only reverse transients. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events only in unidirectional configuration. |
| Cathode | Avalanche clamping terminal | Marked by band; connected to protected line (e.g., VCC, data line); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems without derating. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream ICs-critical for 3.3 V or 5 V logic interfaces with tight absolute max limits. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements without compromising surge performance or solderability. |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or pre-bake requirements. |
| 150 °C max junction temperature | Allows operation in under-hood automotive or high-temperature industrial environments with appropriate thermal design. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in body control modules against load dump and alternator ripple. IC Role / Device Role: Unidirectional clamping TVS placed between battery input and DC-DC converter input. Use Value: Limits transient voltage to ≤13.6 V, preventing damage to 16 V-rated input stages while surviving 400 W pulses. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role: Parallel-connected TVS on signal line between sensor and ADC input. Use Value: Sub-14 V clamping ensures signal integrity remains within 3.3 V ADC's absolute maximum rating during ±8 kV contact ESD. |
| Consumer USB Port ESD Protection | Telecom Data Line Surge Suppression |
|
Use Scenario: Safeguarding USB 2.0 D+/D− lines in portable chargers and docking stations from human-body-model ESD. IC Role / Device Role: Bidirectional-capable variant not applicable; SMAJ8.0A-M3/5A used only where unidirectional grounding is implemented (e.g., D− to GND). Use Value: 50 μA leakage at 8.0 V avoids signal distortion; fast response time (<1 ns) prevents ESD-induced latch-up in USB transceivers. |
Use Scenario: Protecting RS-485 transceiver inputs in building automation controllers exposed to lightning-induced surges on long cable runs. IC Role / Device Role: Primary clamping device on differential bus lines referenced to local ground plane. Use Value: 29.4 A IPPM rating handles 10/1000 μs surges up to 1 kV on 50 Ω lines; RθJL = 30 °C/W enables localized heat dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | No difference in protection function; E3 variant lacks halogen-free certification required for some automotive Tier 1 programs. | Select SMAJ8.0A-M3/5A when halogen-free compliance is mandated; otherwise E3 offers identical surge performance at lower cost. |
| SMBJ8.0A-M3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; same VWM/VBR/VC. | Better suited for higher-energy surges (e.g., IEC 61000-4-5 Level 5); requires larger PCB footprint and different pad layout. | Choose SMBJ8.0A-M3 only if system-level surge testing exceeds 400 W; SMAJ8.0A-M3/5A remains optimal for space-constrained 400 W designs. |
Compared with SMAJ8.0A-E3/5A, the M3 suffix adds halogen-free compliance without altering electrical behavior; versus SMBJ8.0A-M3, the SMAJ8.0A-M3/5A trades 200 W pulse power for 30 % smaller footprint and identical clamping performance-ideal for compact consumer and automotive ECUs.
Availability
SMAJ8.0A-M3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, consumer USB power delivery circuits, and telecom interface protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ8.0A-M3/5A 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, power efficiency, and AEC-Q qualification.
The SMAJ series targets cost-sensitive, high-volume transient protection applications in automotive, industrial, and consumer markets-designed for robustness under repetitive surge stress and compatibility with automated SMT assembly.
FAQ
What is the clamping voltage of the SMAJ8.0A-M3/5A under a 10/1000 μs surge?
The SMAJ8.0A-M3/5A clamps to a maximum of 13.6 V when subjected to its rated peak pulse current of 29.4 A under the standardized 10/1000 μs waveform. This value is measured at the device terminals with specified mounting conditions (0.2" × 0.2" copper pads) and represents the upper voltage limit imposed on the protected circuit during transient events.
Is the SMAJ8.0A-M3/5A suitable for automotive applications?
Yes, the SMAJ8.0A-M3/5A is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/5A variant is commercial-grade. For non-safety-critical automotive subsystems like infotainment power rails or sensor interfaces, SMAJ8.0A-M3/5A provides validated surge performance and halogen-free compliance-though full AEC-Q101 validation requires the HM3_X ordering code.
How does the SMAJ8.0A-M3/5A differ from bidirectional TVS diodes like SMAJ8.0CA?
The SMAJ8.0A-M3/5A is unidirectional and features a cathode band for polarity identification, conducting only in reverse avalanche mode. In contrast, SMAJ8.0CA is bidirectional with symmetrical clamping in both directions and no polarity marking. SMAJ8.0A-M3/5A is used where the protected line has defined DC bias (e.g., VCC to GND), whereas SMAJ8.0CA suits AC-coupled or floating signal lines.
What is the maximum operating temperature for the SMAJ8.0A-M3/5A?
The SMAJ8.0A-M3/5A has a specified operating junction temperature range of -55 °C to +150 °C. Its thermal resistance (RθJA = 120 °C/W) means that at 25 °C ambient and 3.3 W steady-state power dissipation, junction temperature reaches approximately 400 °C-well beyond rating; thus, it is intended for transient, not continuous, power dissipation.
Does the SMAJ8.0A-M3/5A require a heatsink for standard surge protection use?
No, the SMAJ8.0A-M3/5A does not require an external heatsink for typical transient suppression applications because surge events are short-duration (microseconds), and energy dissipation occurs before significant thermal buildup. Its RθJA = 120 °C/W is specified for steady-state conditions, but transient thermal impedance is far lower-enabling full 400 W pulse handling on standard PCB copper pads.
SMAJ8.0A-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ8.0A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0A-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ8.0A-M3/5A 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-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0A-M3/5A?
SMAJ8.0A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0A-M3/5A 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-M3/5A?
For technical support, including SMAJ8.0A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0A-M3/5A requirements.
6.How does Aetrix verify that SMAJ8.0A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0A-M3/5A?
All SMAJ8.0A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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