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Vishay General Semiconductor - Diodes Division SMAJ70CAHE3/61
- Part No.:
- SMAJ70CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHE3/61.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,507
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Product details
Overview
SMAJ70CAHE3/61 from Vishay General Semiconductor is a bidirectional 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 SMAJ70CAHE3/61 datasheet, SMAJ70CAHE3/61 pinout, SMAJ70CAHE3/61 application, or SMAJ70CAHE3/61 equivalent, this AEC-Q101 qualified, RoHS-compliant bidirectional TVS offers verified surge immunity for 12 V/24 V DC systems, ESD-sensitive analog front-ends, and CAN/LIN bus protection where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 MΩ at 70 V), but switches to low-impedance conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤113 V. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns.
Thermally, it sustains 150 °C junction temperature with RθJA = 120 °C/W and RθJL = 30 °C/W, and is rated for 40 A non-repetitive forward surge (IFSM) - supporting robust protection in motor drive and relay-switching environments where inductive kickback exceeds 100 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for 12 V/24 V rail protection. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensures reliable turn-on above nominal system voltage while avoiding false triggering. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage during 10/1000 μs surge; limits stress on downstream 100 V-rated MOSFETs or 3.3 V/5 V logic with external series impedance. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 kV) surge immunity testing. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); withstands inductive turn-off spikes from solenoids or relays without degradation. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive modules and enclosed industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. No polarity marking - bidirectional construction eliminates cathode/anode orientation requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line and ground (or between differential lines) without directional constraint. |
| Case (body) | Non-electrical mechanical interface | Plastic molding provides UL 94 V-0 flammability rating and thermal isolation; no electrical connection or heat sinking function. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485, CAN), or floating DC rails without polarity matching. |
| 400 W peak pulse power | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications up to Level 3. |
| AEC-Q101 qualification | Validated for automotive under-hood and body-control module use, including temperature cycling and humidity testing. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V microcontroller I/O below 12 V during 1 kV surge. |
| MSL Level 1 (260 °C reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and chassis ground, responding within <1 ns to limit voltage to ≤113 V. Use Value: Prevents latch-up or gate oxide damage in automotive microcontrollers and power management ICs during 120 V/500 ms load dump events. |
Use Scenario: Shielding 4–20 mA current-loop transmitters and analog sensor outputs (e.g., pressure, temperature) from ESD and field-induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt clamp on signal line-to-ground, absorbing ±8 kV contact ESD (IEC 61000-4-2) without signal distortion. Use Value: Maintains signal integrity and prevents ADC saturation or op-amp input stage damage in harsh factory-floor environments. |
| DC Motor Drive Control | Telecom Power Supply Input |
Use Scenario: Suppressing inductive kickback from brushed DC motors controlled by H-bridge drivers in robotics and HVAC actuators. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or driver supply pins, conducting surge energy away from gate drivers and current sense amplifiers. Use Value: Eliminates need for snubber RC networks while sustaining 40 A single-pulse surge capability and preventing MOSFET avalanche failure. |
Use Scenario: Front-end surge protection for 48 V telecom rectifier inputs exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: First-stage clamping device upstream of bulk capacitors and DC/DC converters, rated for 10/1000 μs waveform per IEC 61000-4-5. Use Value: Limits input voltage to <120 V during 2 kV open-circuit surge, enabling use of cost-optimized 100 V input-rated downstream components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-E3/61 | Commercial-grade (non-AEC-Q101), identical electrical specs and package; same VWM, VBR, VC, PPPM. | Not qualified for automotive use; suitable for consumer or industrial equipment with lower reliability requirements. | Select when AEC-Q101 qualification is not mandated and cost optimization is prioritized. |
| SMBJ70CAHE3/61 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 27% larger footprint, 10% higher PPPM (600 W), RθJA = 85 °C/W. | Better thermal performance and surge margin; requires PCB layout change due to larger pad dimensions and terminal spacing. | Choose when higher surge endurance or improved thermal dissipation is required, and board space permits SMB footprint. |
Compared with SMAJ70CAHE3/61, the commercial SMAJ70CA-E3/61 offers identical protection performance at lower cost but lacks automotive qualification; the SMBJ70CAHE3/61 delivers higher surge capacity and better thermal resistance in a larger package, requiring layout revision but enabling longer lifetime in high-duty-cycle surge environments.
Availability
SMAJ70CAHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom power supply designs requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for SMAJ70CAHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in automotive, industrial, and telecom systems - delivering precise clamping, AEC-Q101 validation, and surface-mount compatibility for automated manufacturing.
FAQ
What is the clamping voltage of SMAJ70CAHE3/61 at its rated peak pulse current?
The SMAJ70CAHE3/61 has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures predictable overvoltage limiting for downstream 100 V-rated components. The SMAJ70CAHE3/61 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMAJ70CAHE3/61 suitable for protecting CAN bus lines?
Yes, SMAJ70CAHE3/61 is suitable for CAN bus protection due to its bidirectional structure, low clamping voltage (113 V), and fast response time (<1 ns). It can be placed across CANH–CANL or from each line to ground to suppress ESD and fast transients while preserving signal integrity. The SMAJ70CAHE3/61's VWM of 70 V exceeds typical CAN common-mode voltage ranges, ensuring no leakage interference during normal operation.
Does SMAJ70CAHE3/61 require a heatsink for standard operation?
No, SMAJ70CAHE3/61 does not require an external heatsink under typical surge conditions. Its RθJA of 120 °C/W and 3.3 W steady-state power dissipation (PD) are sufficient for intermittent transient suppression. For repetitive surge events exceeding 0.01% duty cycle, PCB copper area (≥0.2" × 0.2" per terminal) is recommended - but no additional heatsink is specified in the SMAJ70CAHE3/61 datasheet or application guidance.
How does the AEC-Q101 qualification of SMAJ70CAHE3/61 impact its use in automotive designs?
The AEC-Q101 qualification of SMAJ70CAHE3/61 validates its reliability for automotive applications including engine control, body electronics, and ADAS modules. It confirms passing tests for temperature cycling, highly accelerated life testing (HALT), and ESD robustness - eliminating need for additional qualification by Tier 1 suppliers. The SMAJ70CAHE3/61 is approved for under-hood use up to 150 °C junction temperature.
What is the reverse leakage current of SMAJ70CAHE3/61 at its maximum working voltage?
At its stand-off voltage (VWM) of 70 V and ambient temperature of 25 °C, the SMAJ70CAHE3/61 exhibits a maximum reverse leakage current (ID) of 1 μA. This low leakage ensures minimal power loss and no measurable loading on 12 V or 24 V supply rails during normal operation - critical for always-on automotive modules and battery-powered industrial sensors.
SMAJ70CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70CAHE3/61 FAQ
1.How can I place an order for SMAJ70CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHE3/61 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 SMAJ70CAHE3/61 reliable?
The price and inventory of SMAJ70CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHE3/61?
SMAJ70CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHE3/61 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 SMAJ70CAHE3/61?
For technical support, including SMAJ70CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ70CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHE3/61 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 SMAJ70CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHE3/61?
All SMAJ70CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHE3/61, 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 SMAJ70CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ70CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAHE3/61 Tags
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