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Vishay General Semiconductor - Diodes Division SMAJ70CA-E3/5A
- Part No.:
- SMAJ70CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CA-E3/5A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,256
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Product details
Overview
SMAJ70CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ70CA-E3/5A datasheet, SMAJ70CA-E3/5A pinout, SMAJ70CA-E3/5A application, or SMAJ70CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.61), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on standard PCB pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device across protected lines, responding within <1 ps to fast-rising transients. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-dependent layout constraints. The glass-passivated junction enables stable leakage performance (<1.0 μA at 70 V) and robust surge handling up to 40 A IFSM (8.3 ms half-sine).
Thermal design relies on RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting continuous operation up to TJ = 150 °C. Derating curves confirm usable pulse power down to ~250 W at 100 °C ambient, maintaining protection integrity in high-temperature environments like engine control units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage under 10/1000 μs surge; limits downstream voltage stress to ≤113 V during 400 W transient. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating determines survivability of common lightning/inductive-switching surges. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in always-on circuits. |
| TJ max | +150 °C - Enables deployment in under-hood automotive, motor drives, and industrial enclosures without thermal derating penalties. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with 5.28 mm length, compatible with JEDEC-compliant reflow profiles and J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance. Bidirectional construction means no polarity marking - both terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge current during positive transients; completes bidirectional clamping loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions eliminates need for polarity-aware routing or orientation checks during assembly. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) on 12 V DC lines when properly laid out with 0.2" × 0.2" copper pads. |
| Low clamping ratio (VC/VWM) | 1.61 - Minimizes overvoltage exposure to protected ICs compared to alternatives with ratios >1.8. |
| AEC-Q101 qualification path | Available via HE3 suffix variants - supports functional safety requirements in automotive ECUs without redesign. |
| MSL level 1 moisture sensitivity | Enables board assembly without baking or dry-pack handling; compatible with standard SMT reflow profiles up to 260 °C peak. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V battery-fed microcontroller power rails in body control modules. IC Role / Device Role / Timing Role: Voltage-clamping protector placed between fuse and LDO input, reacting sub-nanosecond to clamp spikes to ≤113 V. Use Value: Prevents permanent damage to 5 V/3.3 V logic supplies by limiting transient energy dissipation to the TVS instead of downstream regulators. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and cable discharge events in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional shunt element across signal pair, conducting only during overvoltage excursions while remaining high-impedance during normal operation. Use Value: Maintains signal fidelity (leakage <1 μA) while surviving ±8 kV contact ESD per IEC 61000-4-2 without parameter shift. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Protecting PoE-powered device inputs against induced surges from nearby AC wiring or lightning coupling in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary front-end clamp on DC input rail, coordinated with upstream GDT or MOV for multi-stage protection architecture. Use Value: Limits let-through voltage to <113 V, ensuring compliance with EN 61000-4-5 surge immunity requirements for Class 3 equipment. | Use Scenario: Safeguarding AC-DC adapter secondary-side outputs against transient coupling from primary-side switching noise or mains surges. IC Role / Device Role / Timing Role: Secondary-side TVS placed after rectifier and bulk capacitor, clamping output overvoltage before it reaches USB or DC barrel jack. Use Value: Avoids nuisance shutdown or latch-up in connected devices by holding output within ±10 % of nominal during 10/1000 μs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-E3/52 | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Higher power handling supports longer surge durations; requires larger PCB footprint and higher thermal mass. | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when layout allows 5.3 mm × 4.6 mm footprint. |
| SMCJ70CA-E3/73 | Same electrical specs in SMC (DO-214AB) package; 1500 W PPPM rating and lower RθJA (60 °C/W). | Supports repeated surge events in high-duty-cycle environments; needs 7.1 mm × 6.2 mm board area. | Choose for industrial motor drives or renewable energy inverters where thermal cycling and cumulative surge stress dominate reliability concerns. |
Compared with SMBJ70CA-E3/52 and SMCJ70CA-E3/73, the SMAJ70CA-E3/5A delivers optimal balance of compact size, cost efficiency, and 400 W surge capability for space-constrained consumer and automotive modules - trading peak power headroom for minimal PCB real estate and assembly compatibility.
Availability
SMAJ70CA-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with RoHS-compliant, commercial-grade traceability.
Supply support for SMAJ70CA-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, precision, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive infotainment, ADAS power domains, and industrial PLC I/O modules where consistent clamping performance and long-term stability are critical.
FAQ
What is the maximum clamping voltage of SMAJ70CA-E3/5A under a 10/1000 μs surge?
The SMAJ70CA-E3/5A has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and reflects worst-case voltage seen by protected circuitry during surge events - critical for verifying downstream IC voltage tolerance margins.
Is SMAJ70CA-E3/5A suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ70CA-E3/5A itself is RoHS-compliant commercial grade; however, the identical device with HE3 suffix (e.g., SMAJ70CAHE3_A/I) is AEC-Q101 qualified. For automotive use, specify the HE3 or HM3 variant - SMAJ70CA-E3/5A may be used in non-safety-critical prototyping but lacks formal qualification documentation required for production ECUs.
How does the bidirectional design of SMAJ70CA-E3/5A affect PCB layout?
The bidirectional design of SMAJ70CA-E3/5A eliminates polarity marking and orientation dependency - both terminals are electrically symmetric. This simplifies layout by removing cathode-band alignment requirements, enabling placement in either direction across differential lines or ungrounded rails without functional impact or risk of reverse installation.
What is the thermal resistance from junction to ambient for SMAJ70CA-E3/5A?
The typical junction-to-ambient thermal resistance (RθJA) of SMAJ70CA-E3/5A is 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes still air conditions and directly informs maximum allowable power dissipation at elevated ambient temperatures per Figure 2 in the datasheet.
Can SMAJ70CA-E3/5A replace SMAJ70A-E3/5A in a design?
No - SMAJ70CA-E3/5A is bidirectional while SMAJ70A-E3/5A is unidirectional. Substituting them without circuit review risks failure: SMAJ70A conducts only during positive surges and blocks negative ones, whereas SMAJ70CA clamps both polarities. Use SMAJ70CA-E3/5A only where bidirectional protection is explicitly required and verified in the schematic.
SMAJ70CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ70CA-E3/5A FAQ
1.How can I place an order for SMAJ70CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CA-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 SMAJ70CA-E3/5A reliable?
The price and inventory of SMAJ70CA-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 SMAJ70CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ70CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CA-E3/5A?
SMAJ70CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CA-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 SMAJ70CA-E3/5A?
For technical support, including SMAJ70CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ70CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ70CA-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 SMAJ70CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ70CA-E3/5A?
All SMAJ70CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CA-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 SMAJ70CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ70CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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