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Vishay General Semiconductor - Diodes Division SMAJ70AHM3_A/H
- Part No.:
- SMAJ70AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHM3_A/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,244
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Product details
Overview
SMAJ70AHM3_A/H from Vishay General Semiconductor is a unidirectional 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 SMAJ70AHM3_A/H datasheet, SMAJ70AHM3_A/H pinout, SMAJ70AHM3_A/H application, or SMAJ70AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (−55 to +150 °C), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at 70 V), while the SMA package supports high surge robustness with 40 A IFSM (8.3 ms half-sine) and meets MSL level 1 reflow requirements (peak 260 °C).
The device delivers consistent clamping performance across temperature due to a +0.105 %/°C VBR temperature coefficient and maintains low incremental surge resistance for effective energy diversion. It is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive-grade reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - defines guaranteed avalanche onset window under standardized test conditions |
| VC @ IPPM | 113 V at 3.5 A - clamped voltage during 10/1000 μs transient, limiting stress on downstream components |
| PPPM | 400 W - peak pulse power handling capability with standard 10/1000 μs waveform |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage preserves system efficiency and signal integrity |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial enclosures |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on recommended 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse voltage reference node | Connected to lower-potential side of protected line; determines polarity-sensitive placement |
| Cathode | Avalanche conduction terminal / clamping output | Marked with band; ties to higher-potential rail or supply to enable unidirectional clamping action |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress-test requirements |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global OEM supply chains without compromising surge robustness |
| 400 W peak pulse power | Handles high-energy transients such as ISO 7637-2 Load Dump pulses when mounted on specified copper pads |
| Fast response time & low clamping ratio | Sub-nanosecond turn-on and VC/VBR ≈ 1.46 ensure minimal overvoltage exposure to protected ICs |
| MSL Level 1 moisture sensitivity | Enables standard reflow assembly without baking, reducing manufacturing complexity and cost |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump and jump-start transients on 12 V battery-fed ECUs and ADAS modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and input stage of DC-DC converter or LDO. Use Value: Limits voltage excursion to ≤113 V during 400 W surges, preventing latch-up or gate oxide damage in downstream regulators and microcontrollers. | Use Scenario: Guarding analog front-end inputs of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) clamping element on signal lines between connector and ADC input buffer. Use Value: Maintains signal fidelity with <1 μA leakage at 70 V while clamping 8 kV HBM ESD pulses within 1 ns to protect precision op-amps and SAR ADCs. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges from nearby lightning strikes or AC coupling faults. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input before isolation transformer or hot-swap controller. Use Value: Withstands repetitive 400 W transients and operates up to +150 °C ambient, ensuring uptime in outdoor telecom cabinets. | Use Scenario: Protecting USB VBUS and D+/D− lines in portable speakers and smart home hubs from user-handling ESD. IC Role / Device Role / Timing Role: Compact SMA-packaged suppressor co-located near USB connector footprint for shortest possible trace length. Use Value: Leverages 2.29 mm height and 0.064 g weight for space-constrained designs while meeting IEC 61000-4-2 Level 4 (8 kV contact). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70AHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Suitable for commercial/industrial use only; not approved for automotive under-hood deployment | Select when halogen-free content or automotive qualification is not required and cost optimization is prioritized |
| SMBJ70A-M3/5A | Higher 600 W PPPM rating; SMB (DO-214AA) package with larger pad area and 100 °C/W RθJA | Better thermal performance and surge margin; requires larger PCB real estate and different footprint | Choose when higher surge immunity is needed and board space allows SMB footprint relocation |
Compared with SMAJ70AHM3_A/H, SMAJ70AHE3_A/H omits halogen-free and AEC-Q101 compliance but matches all electrical parameters, while SMBJ70A-M3/5A trades compactness for enhanced power handling and thermal dissipation in less space-constrained designs.
Availability
SMAJ70AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom power input stages requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMAJ70AHM3_A/H 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in automotive, industrial, and telecom systems where compact size, AEC-Q101 validation, and precise clamping behavior are critical design requirements.
FAQ
What is the clamping voltage of SMAJ70AHM3_A/H at its rated peak pulse current?
The SMAJ70AHM3_A/H has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM), measured using the standard 10/1000 μs waveform. This value ensures predictable overvoltage limiting during surge events and is verified per JEDEC test conditions in the Vishay datasheet revision 09-Jan-2024. The SMAJ70AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ70AHM3_A/H qualified for automotive applications?
Yes, SMAJ70AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in Vishay's ordering information table. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge robustness required for automotive under-hood and chassis-mounted electronics. The SMAJ70AHM3_A/H is intended for use in ECUs, body control modules, and ADAS power rails where automotive-grade reliability is mandatory.
What does the "HM3" suffix signify in SMAJ70AHM3_A/H?
The "HM3" suffix in SMAJ70AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's documentation, "H" indicates AEC-Q101 qualification, "M3" specifies halogen-free and RoHS-compliant materials, and "_A/H" refers to packaging configuration (7" tape and reel, 1800 units). This distinguishes it from "HE3" (RoHS only, AEC-Q101) and "E3/M3" (commercial grade, non-automotive).
Can SMAJ70AHM3_A/H be used in bidirectional configurations?
No, SMAJ70AHM3_A/H is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and explicit designation in the Vishay datasheet. Bidirectional variants carry the "CA" suffix (e.g., SMAJ70CA). Using SMAJ70AHM3_A/H in bidirectional circuits would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit. Always verify polarity marking (cathode band) during layout.
What is the thermal resistance and maximum junction temperature of SMAJ70AHM3_A/H?
The SMAJ70AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads, and a maximum operating junction temperature (TJ max) of +150 °C. These values are specified in the Thermal Characteristics section of the Vishay datasheet and define safe continuous power dissipation limits - for example, at 3.3 W PD, ambient must remain below ~114 °C to avoid exceeding TJ max. The SMAJ70AHM3_A/H also features RθJL = 30 °C/W for lead-based thermal paths.
SMAJ70AHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70AHM3_A/H FAQ
1.How can I place an order for SMAJ70AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHM3_A/H 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 SMAJ70AHM3_A/H reliable?
The price and inventory of SMAJ70AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ70AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHM3_A/H?
SMAJ70AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHM3_A/H 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 SMAJ70AHM3_A/H?
For technical support, including SMAJ70AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ70AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHM3_A/H 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 SMAJ70AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ70AHM3_A/H?
All SMAJ70AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHM3_A/H, 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 SMAJ70AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ70AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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