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Vishay General Semiconductor - Diodes Division SMAJ8.0-E3/5A
- Part No.:
- SMAJ8.0-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0-E3/5A.pdf
- Description:
- TVS DIODE 8VWM 15VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,607
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Product details
Overview
SMAJ8.0-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features 8.0 V stand-off voltage (VWM), 15.0 V maximum clamping voltage (VC) at 26.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMAJ8.0-E3/5A datasheet, SMAJ8.0-E3/5A pinout, SMAJ8.0-E3/5A application, or SMAJ8.0-E3/5A equivalent, key selection criteria include VWM, VC, IPPM, unidirectional polarity, and DO-214AC thermal performance under repetitive surge conditions.
Technical Context
This device operates as a unidirectional TVS diode with a glass-passivated junction and cathode band marking. Its breakdown voltage (VBR) ranges from 8.89 V to 10.9 V at 1.0 mA test current, ensuring reliable turn-on before system damage occurs during ESD or lightning-induced surges.
Thermal resistance is rated at 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting operation up to 150 °C junction temperature. It meets J-STD-020 MSL level 1 and RoHS 2002/95/EC compliance with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum reverse working voltage before clamping begins; defines safe operating margin below breakdown |
| VC @ IPPM | 15.0 V - Clamped voltage at 26.7 A peak pulse current; limits downstream voltage stress during surge |
| IPPM | 26.7 A - Peak surge current capability with 10/1000 µs waveform; determines protection headroom for defined transients |
| PPPM | 400 W - Peak pulse power dissipation; specifies energy-handling capacity for short-duration overvoltage events |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal design boundary for PCB copper pad layout and ambient derating |
| VBR min./max. | 8.89 V / 10.9 V - Breakdown voltage range at 1.0 mA; ensures consistent clamping threshold across production lot |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking on one end; terminals are matte tin-plated leads compatible with standard reflow and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; completes clamping path during reverse-biased surge |
| Cathode (banded end) | Protected line input | Connected to line being protected (e.g., +12 V rail); conducts when transient exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without thermal runaway |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving clamping precision |
| MSL level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates bake requirements in manufacturing |
| Glass passivated junction | Ensures stable leakage current (<1.0 µA at VWM) and long-term reliability under humidity stress |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between input rail and chassis ground to shunt surge energy away from upstream rectifier and downstream DC-DC controller. Use Value: Limits transient voltage to ≤15.0 V during 26.7 A surges, preventing latch-up or gate oxide rupture in 30 V-rated MOSFETs and controllers. | Use Scenario: LIN bus line protection in door module electronics subjected to ESD and battery clamp transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS on LIN signal line (VWM = 8.0 V matches typical 12 V nominal supply with tolerance margin). Use Value: Clamps ESD pulses to <15.0 V within nanoseconds, preserving signal integrity while meeting ISO 10605 30 kV air discharge requirements. |
| Consumer Appliance Motor Drive | Telecom PoE Interface |
Use Scenario: Reverse EMF suppression across brushed DC motor windings in smart HVAC blower units. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-motor terminal to absorb inductive kickback during PWM switching. Use Value: Handles 40 A non-repetitive forward surge (IFSM) and clamps flyback spikes to 15.0 V, protecting H-bridge MOSFETs rated for 25 V drain-source. | Use Scenario: Secondary-side DC input protection in IEEE 802.3af/at powered device (PD) front-end. IC Role / Device Role / Timing Role: Input rail TVS on 48 V PD interface, selected for VWM > 44 V (PoE Class 4 minimum) but scaled down for lower-voltage auxiliary rails. Use Value: Provides 400 W surge handling at 8.0 V standoff - used on 12 V bias rails feeding PD controller ICs, limiting fault voltage to safe levels during cable hot-swap events. |
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-E3/5A | Lower VBR range (8.89–9.83 V), tighter tolerance; 13.6 V clamping at 29.4 A | Better suited for systems requiring lower clamping voltage and tighter VWM margin | Select when downstream components have <14 V absolute maximum ratings |
| SMCJ8.0A-E3/57T | Higher power rating (1500 W), larger DO-214AB (SMC) package, same VWM/VC specs | Used where higher single-pulse energy absorption is required, e.g., automotive alternator load dump | Choose for applications exceeding 400 W surge duty or needing enhanced thermal mass |
Compared with SMAJ8.0A-E3/5A, the SMAJ8.0-E3/5A offers higher clamping voltage but broader VBR tolerance; versus SMCJ8.0A-E3/57T, it trades surge energy capacity for smaller footprint and lower cost in space-constrained designs.
Availability
SMAJ8.0-E3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, consumer appliance motor drives, telecom PoE interfaces, and sensor signal line protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ8.0-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 supplier of discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability and automotive qualification.
The SMAJ series is engineered for high-speed transient suppression in space-constrained surface-mount applications, targeting industrial, automotive, and telecom systems where fast response and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of the SMAJ8.0-E3/5A under specified test conditions?
The SMAJ8.0-E3/5A has a maximum clamping voltage (VC) of 15.0 V when subjected to its rated peak pulse current of 26.7 A using a 10/1000 µs waveform. This value is measured at TA = 25 °C on 0.2 × 0.2 inch copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ8.0-E3/5A maintains this clamping performance across its qualified operating temperature range.
Is the SMAJ8.0-E3/5A unidirectional or bidirectional, and how is polarity identified?
The SMAJ8.0-E3/5A is a unidirectional transient voltage suppressor diode, indicated by the absence of "C" or "CA" suffix. Polarity is marked by a cathode band on the banded end of the DO-214AC (SMA) package; the banded terminal is the cathode and must be connected to the line being protected, while the anode connects to ground or return. The SMAJ8.0-E3/5A does not conduct in forward bias beyond its specified IFSM rating.
What is the peak pulse power rating of the SMAJ8.0-E3/5A, and under what waveform is it specified?
The SMAJ8.0-E3/5A is rated for 400 W peak pulse power dissipation with a 10/1000 µs double-exponential waveform, tested at TA = 25 °C on recommended copper pad layout. This rating applies to devices with VWM ≤ 78 V; above that threshold, the rating drops to 300 W. The SMAJ8.0-E3/5A's 400 W rating supports compliance with IEC 61000-4-5 surge immunity testing at common coupling impedances.
Does the SMAJ8.0-E3/5A meet automotive qualification standards?
The SMAJ8.0-E3/5A is a commercial-grade device compliant with RoHS 2002/95/EC and WEEE 2002/96/EC, but it is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101, the HE3-suffix variant (e.g., SMAJ8.0AHE3/5A) must be selected. The SMAJ8.0-E3/5A remains suitable for industrial and consumer systems where extended temperature operation and moisture resistance are required but formal automotive qualification is not mandated.
What is the thermal resistance specification for the SMAJ8.0-E3/5A, and how does it affect PCB layout?
The SMAJ8.0-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. These values assume mounting on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must replicate this pad area and avoid excessive trace length or isolation. The SMAJ8.0-E3/5A's thermal performance directly impacts its ability to sustain multiple surges without degradation.
SMAJ8.0-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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
SMAJ8.0-E3/5A FAQ
1.How can I place an order for SMAJ8.0-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0-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 SMAJ8.0-E3/5A reliable?
The price and inventory of SMAJ8.0-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 SMAJ8.0-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0-E3/5A?
SMAJ8.0-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0-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 SMAJ8.0-E3/5A?
For technical support, including SMAJ8.0-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0-E3/5A requirements.
6.How does Aetrix verify that SMAJ8.0-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0-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 SMAJ8.0-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0-E3/5A?
All SMAJ8.0-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0-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 SMAJ8.0-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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