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Vishay General Semiconductor - Diodes Division SMAJ70-E3/5A
- Part No.:
- SMAJ70-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70-E3/5A.pdf
- Description:
- TVS DIODE 70VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
SMAJ70-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 70 V stand-off voltage (VWM), 125 V maximum clamping voltage (VC) at 3.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ70-E3/5A datasheet, SMAJ70-E3/5A pinout, SMAJ70-E3/5A application, or SMAJ70-E3/5A equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 77.8–95.1 V breakdown range, 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance, enabling fast response to ESD and inductive switching spikes.
The SMAJ70-E3/5A is rated for 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits 120 °C/W typical junction-to-ambient thermal resistance when mounted on 5.0 × 5.0 mm copper pads - confirming suitability for board-level surge suppression without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 77.8 V / 95.1 V at 1.0 mA test current - Specifies guaranteed avalanche onset range for reliable overvoltage detection. |
| VC @ IPPM | 125 V at 3.2 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| IPPM | 3.2 A - Peak surge current capability under standard 10/1000 µs waveform; defines transient energy handling limit. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like motor drives and power converters. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two terminals, cathode marked by a band on one end. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD201 class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential side of protected line. | When used in unidirectional configuration, anode ties to ground or return path - defines polarity-sensitive placement. |
| Cathode | Current exit point in forward bias; marked by band; connects to protected line. | Clamping occurs between cathode and anode; cathode must be placed on the line requiring overvoltage protection (e.g., +12 V rail). |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable breakdown voltage over time and temperature; prevents parameter drift in long-life industrial deployments. |
| 400 W peak pulse power (10/1000 µs) | Handles common lightning-induced surges and inductive kickback without failure - validated per IEC 61000-4-5 Level 3. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for downstream 3.3 V or 5 V logic. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow up to 260 °C peak - eliminates baking requirements and simplifies SMT manufacturing. |
| RoHS-compliant & halogen-free | Meets EU Directive 2011/65/EU and IPC-1752A reporting standards - supports green procurement and export compliance. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive switching spikes from relay coils and solenoids. IC Role / Device Role / Timing Role: Unidirectional TVS placed across MOSFET gate-source or MCU input pins to clamp sub-100 ns transients. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic while maintaining <1.0 µA leakage at 70 V system rail. |
Use Scenario: Shielding LIN bus transceivers and sensor supply lines from load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-rated clamping device on 12 V battery-fed circuits, responding within <1 ns to >100 V transients. Use Value: Limits clamped voltage to 125 V - below ISO 7637-2 Pulse 5a test limits - ensuring robustness without derating. |
| Telecom Power Rectifier Outputs | Consumer Appliance Mainboard Power Rails |
Use Scenario: Safeguarding secondary-side DC outputs of AC/DC adapters against surge coupling from primary-side transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on +48 V or +24 V output rails to absorb repetitive 10/1000 µs surges. Use Value: Delivers 400 W pulse handling with 120 °C/W thermal resistance - enables self-cooling on standard PCB copper areas. |
Use Scenario: Protecting microcontroller reset lines and USB VBUS inputs from ESD and hot-plug transients in washing machines and HVAC controls. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) unidirectional suppressor placed near connector entry points. Use Value: Maintains signal integrity during normal operation while triggering reliably at 77.8 V - preventing false resets or brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/5A | Lower VBR range (77.8–86.0 V); tighter 10% VWM tolerance vs. SMAJ70-E3/5A's 12.5%. | Better suited for precision 70 V systems where clamping consistency is critical; slightly lower VC (113 V). | Select SMAJ70A-E3/5A when design requires tighter breakdown control and reduced clamping voltage at same IPPM. |
| SMCJ70A-E3/57T | Higher power rating (1500 W), larger DO-214AB (SMC) package, same VWM/VBR specs. | Used where higher surge repetition rate or longer pulse duration (e.g., 10/1000 µs at 1 kHz) is required. | Choose SMCJ70A-E3/57T only if 400 W is insufficient - requires PCB layout change due to larger footprint and thermal pad area. |
Compared with SMAJ70-E3/5A, SMAJ70A-E3/5A offers improved VBR uniformity for tighter system margins, while SMCJ70A-E3/57T trades compactness for 3.75× higher pulse power - making SMAJ70-E3/5A optimal for space-constrained 400 W surge protection.
Availability
SMAJ70-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom power rectifier outputs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ70-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, efficiency, and manufacturability.
The SMAJ series is engineered for board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, low leakage, and repeatable clamping are essential.
FAQ
What is the breakdown voltage range for SMAJ70-E3/5A?
The SMAJ70-E3/5A has a guaranteed breakdown voltage (VBR) range of 77.8 V to 95.1 V at 1.0 mA test current, per Vishay Document 88390 Rev. 29-Oct-08. This wide range reflects the unidirectional TVS's process tolerance and ensures reliable triggering above the 70 V stand-off voltage while accommodating manufacturing variance - critical for designs operating near the upper edge of nominal rail voltages.
Is SMAJ70-E3/5A RoHS compliant and lead-free?
Yes, SMAJ70-E3/5A is RoHS 2011/65/EU compliant and lead-free. The "E3" suffix explicitly denotes Vishay's commercial-grade, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 class 1A whisker resistance requirements - verified in the ordering information table on page 4 of Document 88390.
What is the maximum clamping voltage of SMAJ70-E3/5A under surge conditions?
The SMAJ70-E3/5A clamps to a maximum of 125 V when subjected to its rated peak pulse current of 3.2 A with a 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 3 of Vishay Document 88390 and defines the highest voltage seen by downstream circuitry during standardized surge events - directly informing safe operating margins for protected ICs.
Can SMAJ70-E3/5A be used in bidirectional applications?
No, SMAJ70-E3/5A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. Bidirectional operation requires parts like SMAJ70CA-E3/5A. Using SMAJ70-E3/5A in reverse-biased configurations risks permanent breakdown, as its cathode-band marking and internal structure are optimized for single-polarity clamping - confirmed in the "DEVICES FOR BI-DIRECTION APPLICATIONS" section of Document 88390.
What is the thermal resistance of SMAJ70-E3/5A, and how does it affect PCB layout?
SMAJ70-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal, as specified in the Thermal Characteristics table on page 4 of Document 88390. This value mandates minimum copper area for reliable 400 W pulse dissipation - undersized pads cause excessive junction heating and premature failure during repetitive surges.
SMAJ70-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 3.2A
- 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)
SMAJ70-E3/5A FAQ
1.How can I place an order for SMAJ70-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70-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 SMAJ70-E3/5A reliable?
The price and inventory of SMAJ70-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 SMAJ70-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70-E3/5A?
SMAJ70-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70-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 SMAJ70-E3/5A?
For technical support, including SMAJ70-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70-E3/5A requirements.
6.How does Aetrix verify that SMAJ70-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70-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 SMAJ70-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70-E3/5A?
All SMAJ70-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70-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 SMAJ70-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ70-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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