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Vishay General Semiconductor - Diodes Division SMAJ70A-E3/61
- Part No.:
- SMAJ70A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70A-E3/61.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,608
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Product details
Overview
SMAJ70A-E3/61 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 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 3.5 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform).
For engineers reviewing the SMAJ70A-E3/61 datasheet, SMAJ70A-E3/61 pinout, SMAJ70A-E3/61 application, or SMAJ70A-E3/61 equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive ECUs, industrial PLC I/O modules, and telecom interface circuits where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are critical.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 70 V), then rapidly avalanches below 1 ns to clamp transient energy into ground when voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The device delivers 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling effective heat dissipation on standard 0.2" × 0.2" copper pads without additional heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail protection margin. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 113 V at 3.5 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capability; defines survivability against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off; negligible power loss and no loading effect on 70 V supply rails. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial ambient environments. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated placement; meets UL 94 V-0 flammability rating. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band marking on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Current return path during clamping; must be routed with low-inductance trace to minimize voltage overshoot. |
| Cathode | High-side connection to protected line (e.g., +70 V rail) | Surge entry point; polarity-sensitive - reverse connection disables protection and risks catastrophic failure. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive applications. |
| 113 V clamping voltage at 3.5 A | Clamping ratio (VC/VWM = 1.61) ensures downstream 75 V-rated components remain within safe operating area. |
| Fast response time <1 ns | Prevents transient propagation past the TVS, protecting gate oxides of MOSFETs and input stages of op-amps and MCUs. |
| AEC-Q101 qualified (via HE3/HM3 variants) | Validated for automotive use including engine control, body electronics, and ADAS sensor interfaces. |
| MSL level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 70 V battery-fed ECU power inputs against load dump and alternator transients in 24 V commercial vehicle systems. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping surges before they reach DC-DC converters and microcontrollers. Use Value: Withstands 400 W surges while limiting voltage to 113 V - preserving integrity of 120 V-rated input capacitors and LDO regulators. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory-floor pressure/temperature transmitters exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) unidirectional TVS placed in series with signal line, grounded at receiver end to divert transients away from ADC front-end. Use Value: Sub-1 ns response prevents latch-up in precision instrumentation amplifiers; 1.0 μA leakage avoids offset errors in μA-level loop currents. |
| Telecom DC Power Interface | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Guarding -48 V DC feeding ports in telecom base station remote radio units against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS connected between -48 V rail and chassis ground, absorbing common-mode surges coupled onto power pair. Use Value: 70 V VWM matches nominal -48 V system with 20 % margin; 113 V VC ensures downstream -56 V-rated DC-DC controllers remain undamaged. |
Use Scenario: Shielding MCU GPIOs and gate drivers in smart washing machine motor control boards from commutation spikes generated by BLDC motor back-EMF. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC outputs, clamping inductive kickback before it couples into logic supply domains. Use Value: 3.5 A IPPM handles typical motor flyback currents; SMA package allows dense layout near high-dI/dt traces without parasitic inductance penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-E3/61 | Bidirectional variant with same VWM (70 V), symmetric clamping in both polarities; higher ID (2.0 μA) due to dual-junction structure. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Select SMAJ70CA-E3/61 only if bidirectional protection is mandated; unidirectional SMAJ70A-E3/61 offers lower leakage and tighter VBR tolerance for DC rails. |
| SMBJ70A-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W), RθJA = 85 °C/W (vs. 120 °C/W). | Better thermal performance and higher surge margin; requires larger PCB footprint and different tape/reel packaging (52 vs. 61). | Choose SMBJ70A-E3/52 when sustained surge duty cycle or elevated ambient temperatures demand extra thermal headroom; SMAJ70A-E3/61 preferred for space-constrained layouts. |
Compared with SMAJ70CA-E3/61 and SMBJ70A-E3/52, the SMAJ70A-E3/61 provides optimal balance of compact SMA footprint, 400 W surge capability, and ultra-low leakage for fixed-polarity DC protection - making it the default choice for cost- and size-sensitive 70 V rail guard applications.
Availability
SMAJ70A-E3/61 is available at Aetrix Electronics and suitable for automotive ECU power conditioning, industrial sensor interface protection, and telecom DC feed safeguarding requiring stable component supply, RoHS-compliant manufacturing, and consistent tape-and-reel delivery.
Supply support for SMAJ70A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, fast response, and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ70A-E3/61 under a 10/1000 μs surge?
The SMAJ70A-E3/61 exhibits a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 3.5 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SMAJ70A-E3/61 suitable for automotive applications?
Yes, the SMAJ70A-E3/61 is RoHS-compliant and manufactured to commercial-grade specifications; however, its AEC-Q101 qualified counterpart is the SMAJ70AHE3_A variant. While the SMAJ70A-E3/61 shares identical electrical and thermal characteristics, full automotive qualification requires the HE3 suffix. For non-safety-critical 24 V system protection (e.g., infotainment power rails), SMAJ70A-E3/61 is widely deployed - but safety-critical modules should use the HE3 version.
How does the SMAJ70A-E3/61 differ from the SMAJ70CA-E3/61?
The SMAJ70A-E3/61 is unidirectional, with a marked cathode band and asymmetric conduction (conducts only in reverse bias), whereas the SMAJ70CA-E3/61 is bidirectional, featuring symmetrical clamping in both polarities and no polarity marking. Electrically, SMAJ70CA-E3/61 has double the maximum reverse leakage (2.0 μA vs. 1.0 μA at VWM) and identical VBR/VWM/VC specs. Use SMAJ70A-E3/61 for DC rails; choose SMAJ70CA-E3/61 only for AC or floating signal paths like RS-485 or CAN.
What is the thermal resistance of the SMAJ70A-E3/61, and how does it affect layout?
The SMAJ70A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads per terminal. This means PCB layout must provide adequate copper area - minimum recommended pad dimensions are specified in the Vishay outline drawing - to avoid exceeding the +150 °C maximum junction temperature during repetitive surge events or elevated ambient conditions.
Does the SMAJ70A-E3/61 meet any industry surge immunity standards?
The SMAJ70A-E3/61 is engineered to support compliance with IEC 61000-4-5 (surge immunity) and IEC 61000-4-2 (ESD) when properly implemented in system-level designs. Its 400 W peak pulse power rating (10/1000 μs) aligns with Level 4 (4 kV line-to-earth, 2 kV line-to-line) testing requirements. System-level validation remains the designer's responsibility - the SMAJ70A-E3/61 provides the foundational clamping capability, but PCB layout, grounding, and upstream filtering determine final pass/fail outcome.
SMAJ70A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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)
SMAJ70A-E3/61 FAQ
1.How can I place an order for SMAJ70A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70A-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 SMAJ70A-E3/61 reliable?
The price and inventory of SMAJ70A-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 SMAJ70A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70A-E3/61?
SMAJ70A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70A-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 SMAJ70A-E3/61?
For technical support, including SMAJ70A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70A-E3/61 requirements.
6.How does Aetrix verify that SMAJ70A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70A-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 SMAJ70A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70A-E3/61?
All SMAJ70A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70A-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 SMAJ70A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ70A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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