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Vishay General Semiconductor - Diodes Division SMAJ70-E3/61
- Part No.:
- SMAJ70-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70-E3/61.pdf
- Description:
- TVS DIODE 70VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,085
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Product details
Overview
SMAJ70-E3/61 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 standoff voltage (VWM), 125 V maximum clamping voltage (VC) at 3.2 A peak pulse current (IPPM), 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-E3/61 datasheet, SMAJ70-E3/61 pinout, SMAJ70-E3/61 application, or SMAJ70-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant thermal performance, RoHS-compliant packaging details, and real-world protection use cases - all aligned to Vishay Document #88390 Rev. 29-Oct-08.
Technical Context
This unidirectional TVS diode operates by avalanche breakdown above its 77.8–95.1 V breakdown voltage (VBR at 1 mA), providing fast response (<1 ps) to transient overvoltages while maintaining low leakage (<1 µA at 70 V). Its glass-passivated junction ensures stable performance across -55 °C to +150 °C operating temperature range.
The device delivers 400 W peak pulse power dissipation (derated to 300 W above 78 V) under 10/1000 µs waveform, with 30 °C/W typical junction-to-lead thermal resistance enabling effective heat transfer to PCB copper pads. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 48 V–60 V DC bus protection. |
| VC @ IPPM | 125 V - Clamped voltage at 3.2 A peak surge current; limits downstream component stress during lightning or ESD events. |
| IPPM | 3.2 A - Peak pulse current capability with 10/1000 µs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity. |
| PPPM | 400 W - Peak pulse power handling; enables robust protection without derating below 78 V per Vishay spec. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in high-ambient environments like motor drives and automotive ECUs. |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; confirms efficient heat conduction to PCB pads under pulsed conditions. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating. Matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (uni-directional) | Connected to protected line side; conducts only during reverse transient clamp. |
| Cathode | Clamping reference node | Banded end; tied to ground or lower-potential rail to establish clamping threshold at VC. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| 400 W peak pulse power (10/1000 µs) | Supports repeated surge events in industrial control systems without degradation, per Fig. 1 derating curve. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with lead-free assembly up to 260 °C peak. |
| RoHS-compliant & JESD201 Class 1A whisker tested | Validated for commercial-grade applications requiring long-term interconnect integrity in automated assembly. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MCU GPIO and load switch output to clamp negative transients to <125 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic inputs during 100 V+ switching spikes, validated per IEC 61000-4-4. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V power input to BCU submodules, absorbing 400 W pulses without failure. Use Value: Maintains system uptime during ISO 7637-2 Pulse 5a (load dump) events by limiting rail voltage to ≤125 V for downstream LDOs and CAN transceivers. |
| Telecom Power Supplies | Consumer IoT Sensor Hubs |
|
Use Scenario: Input-stage transient protection for 48 V PoE-powered equipment subjected to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail upstream of DC/DC converters, rated for 70 V nominal operation. Use Value: Limits surge energy to <125 V at 3.2 A, preventing converter shutdown or MOSFET avalanche failure during IEC 61000-4-5 1 kV coupling tests. |
Use Scenario: ESD and EFT protection for analog sensor inputs (e.g., temperature, humidity) in battery-powered smart home devices. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS on 3.3 V analog front-end lines, preserving signal integrity while suppressing ±8 kV contact ESD. Use Value: Enables compliance with IEC 61000-4-2 Level 4 without adding series resistance or degrading ADC accuracy due to minimal parasitic capacitance. |
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-E3/61 | Lower VBR range (77.8–86.0 V), tighter 10% VWM tolerance (70 V), 113 V clamping at 3.5 A. | Better suited for precision 70 V rail protection where tighter VWM margin is required; slightly higher IPPM but lower VC. | Select SMAJ70A-E3/61 when clamping voltage headroom is critical and VWM stability >5% is mandated. |
| SMBJ70A-E3/52 | Same VWM/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM, RθJA = 80 °C/W. | Higher power handling and improved thermal dissipation; requires larger PCB footprint and different pad layout. | Choose SMBJ70A-E3/52 for high-reliability 70 V protection in high-temperature enclosures (>85 °C ambient) where 400 W is insufficient. |
Compared with SMAJ70-E3/61, the SMAJ70A-E3/61 offers tighter VWM control and lower clamping voltage for sensitive 70 V rails, while the SMBJ70A-E3/52 provides higher surge endurance and better thermal margin at the cost of board space - making SMAJ70-E3/61 optimal for cost- and size-constrained commercial designs needing proven 400 W protection.
Availability
SMAJ70-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, full traceability, and consistent RoHS-compliant manufacturing.
Supply support for SMAJ70-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, and protection devices with emphasis on reliability, thermal performance, and AEC-Q qualified solutions.
The SMAJ series was developed for surface-mount transient suppression in space-constrained, high-reliability applications - targeting industrial automation, automotive subsystems, and communications infrastructure where fast-response, low-leakage TVS protection is essential.
FAQ
What is the maximum clamping voltage of SMAJ70-E3/61 under standard test conditions?
The SMAJ70-E3/61 has a maximum clamping voltage (VC) of 125 V at 3.2 A peak pulse current (IPPM) with a 10/1000 µs waveform, as specified in Vishay Document #88390. This value ensures downstream components see no more than 125 V during surge events, directly supporting design margin calculations for 70 V nominal systems. The SMAJ70-E3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ70-E3/61 suitable for automotive applications?
SMAJ70-E3/61 is rated for commercial-grade use and complies with RoHS and JESD201 Class 1A whisker requirements, but it is not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the HE3-suffix variants (e.g., SMAJ70HE3/61). The SMAJ70-E3/61 remains appropriate for non-safety-critical automotive subsystems like infotainment power rails where full AEC-Q101 is not mandated - always verify system-level compliance requirements before deployment.
What is the standoff voltage and why does it matter for SMAJ70-E3/61?
The standoff voltage (VWM) of SMAJ70-E3/61 is 70 V - the maximum continuous reverse voltage the device can block without significant leakage current (<1 µA). This parameter defines the upper limit of normal operating voltage on the protected line; exceeding VWM risks premature conduction and power loss. For SMAJ70-E3/61, a 70 V VWM makes it ideal for protecting 48 V or 60 V DC systems where transient margins must be preserved without false triggering.
How does the thermal resistance of SMAJ70-E3/61 affect PCB layout?
SMAJ70-E3/61 has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, meaning effective heat transfer relies on direct conduction through its leads to adequately sized copper pads. Vishay recommends 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal to sustain 400 W pulse ratings. Smaller pads increase thermal impedance, causing higher junction temperatures and potential derating - so PCB layout must follow the mounting pad dimensions shown in Figure 5 of Document #88390 to ensure reliable SMAJ70-E3/61 operation.
Can SMAJ70-E3/61 be used in bidirectional configurations?
No - SMAJ70-E3/61 is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires CA-suffix parts (e.g., SMAJ70CA), which have symmetrical breakdown characteristics in both polarities. Using SMAJ70-E3/61 in reverse-biased AC or floating applications will result in forward conduction and failure. Always match the device type (uni- vs. bi-directional) to the circuit's voltage polarity and grounding scheme - SMAJ70-E3/61 is strictly for DC line-to-ground clamping with defined polarity.
SMAJ70-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:
- 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-E3/61 FAQ
1.How can I place an order for SMAJ70-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70-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 SMAJ70-E3/61 reliable?
The price and inventory of SMAJ70-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 SMAJ70-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70-E3/61?
SMAJ70-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70-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 SMAJ70-E3/61?
For technical support, including SMAJ70-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70-E3/61 requirements.
6.How does Aetrix verify that SMAJ70-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70-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 SMAJ70-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70-E3/61?
All SMAJ70-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70-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 SMAJ70-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ70-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70-E3/61 Tags
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