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Vishay General Semiconductor - Diodes Division SMAJ70AHE3_A/H
- Part No.:
- SMAJ70AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHE3_A/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
SMAJ70AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown range at 1 mA, clamps transients to ≤113 V at 3.5 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform). It is AEC-Q101 qualified and used in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMAJ70AHE3_A/H datasheet, SMAJ70AHE3_A/H pinout, SMAJ70AHE3_A/H application, or SMAJ70AHE3_A/H equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, 150 °C max junction temperature, low 1.0 μA reverse leakage at VWM, and compliance with UL 497B for surge protector classification.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche behavior, and its low incremental surge resistance (Rdyn) enables tight clamping under fast-rising surges such as ISO 7637-2 pulses or IEC 61000-4-5 ring waves.
The SMAJ70AHE3_A/H is rated for repetitive 0.01% duty cycle surges up to 400 W below 78 V (derated to 300 W above), mounted on 5.0 mm × 5.0 mm copper pads. Its thermal resistance (RθJA = 120 °C/W) and AEC-Q101 qualification confirm suitability for under-hood automotive environments with extended temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | ≤113 V at 3.5 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on downstream ICs. |
| IPPM | 3.5 A - Peak pulse current capability under standard 10/1000 μs waveform; correlates directly to energy handling (400 W). |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated standoff; critical for low-power sensor and battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in engine control units and industrial motor drives. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with automated SMT placement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal avalanche junction | Connected to protected line; conducts surge current toward ground when voltage exceeds VBR. |
| Anode | Cathode of internal avalanche junction | Typically tied to system ground or low-impedance return path; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including powertrain and body electronics per stress test requirements. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients like load dump (ISO 16750-2) without degradation when properly mounted. |
| Glass-passivated junction | Ensures consistent avalanche characteristics and long-term reliability across temperature and life cycles. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, protecting sensitive 75 V-rated MOSFETs and gate drivers. |
| RoHS-compliant + halogen-free option | Meets automotive and industrial environmental compliance mandates (e.g., ELV, RoHS Directive 2011/65/EU). |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V vehicle power inputs against load dump and jump-start surges per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤113 V, preventing damage to upstream regulators and microcontrollers rated for 80 V absolute max. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) TVS shunting transients to ground adjacent to op-amp output stage. Use Value: Maintains signal integrity with <1.0 μA leakage at 70 V, avoiding offset errors in precision current-sense circuits. |
| Telecom DC Power Feeds | Consumer Power Adapter Outputs |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary-side DC bus, coordinated with upstream MOV and fuse. Use Value: Fast response (<1 ns) and 400 W rating absorb multiple 10/1000 μs surges without derating, supporting Class 4 PoE+ robustness. |
Use Scenario: Secondary-side overvoltage clamp in AC/DC adapters for USB-C PD and laptop chargers. IC Role / Device Role / Timing Role: Final-stage protection before connector, guarding against output short-circuit recovery spikes. Use Value: 150 °C TJ max and DO-214AC footprint enable compact layout near output connector without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/61 | Same electrical specs and SMA package; commercial-grade (non-AEC-Q101), RoHS-compliant only. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and thermal cycling is less severe. |
| SMAJ70CAHE3_A/H | Bidirectional variant; identical VWM (70 V), VBR, and VC, but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Choose only if bidirectional protection is needed; unidirectional SMAJ70AHE3_A/H offers lower leakage and simpler grounding. |
Compared with SMAJ70A-E3/61, the SMAJ70AHE3_A/H adds AEC-Q101 qualification and tighter process controls for automotive use; compared with SMAJ70CAHE3_A/H, it provides lower reverse leakage and simplified ground-referenced layout for DC rail protection.
Availability
SMAJ70AHE3_A/H is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor interfaces, telecom DC feeds, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ70AHE3_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, MOSFETs, and protection devices with emphasis on reliability and automotive-grade performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMAJ70AHE3_A/H under a 10/1000 μs surge?
The SMAJ70AHE3_A/H clamps to a maximum 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 IEC 61000-4-5 and confirmed in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024). The clamping voltage directly determines the maximum overvoltage seen by downstream components during surge events, making it a critical parameter for system-level protection design. Always verify layout and PCB copper area per the recommended 5.0 mm × 5.0 mm pad dimensions to achieve this spec.
Is the SMAJ70AHE3_A/H suitable for automotive applications?
Yes, the SMAJ70AHE3_A/H is explicitly AEC-Q101 qualified, as noted in the Vishay ordering information table and thermal characteristics section. Its construction-including glass-passivated junction, MSL Level 1 reflow rating, and operation up to +150 °C junction temperature-meets automotive reliability requirements for powertrain, body control, and infotainment systems. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified grade, distinguishing it from commercial variants like SMAJ70A-E3/61. This makes SMAJ70AHE3_A/H appropriate for under-hood and dashboard-mounted electronics.
How does the SMAJ70AHE3_A/H differ from the bidirectional SMAJ70CAHE3_A/H?
The SMAJ70AHE3_A/H is unidirectional, meaning it conducts only when the cathode is positive relative to the anode-ideal for DC rail protection with defined polarity. In contrast, SMAJ70CAHE3_A/H is bidirectional and symmetric, clamping surges of either polarity, which is necessary for AC-coupled or floating lines like RS-485 or CAN. Electrically, both share identical VWM (70 V), VBR, and VC, but SMAJ70AHE3_A/H exhibits lower reverse leakage (≤1.0 μA vs. ≤2.0 μA for the CA version), improving accuracy in precision analog circuits. Polarity marking (cathode band) applies only to the unidirectional SMAJ70AHE3_A/H.
What is the maximum reverse leakage current for the SMAJ70AHE3_A/H at its standoff voltage?
The maximum reverse leakage current (ID) for the SMAJ70AHE3_A/H is 1.0 μA when biased at its rated standoff voltage of 70 V and tested at 25 °C, as specified in the Electrical Characteristics table of the Vishay datasheet. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and extends battery life in always-on systems. Leakage increases with temperature and voltage-e.g., at 125 °C and 70 V, typical leakage rises to ~10 μA-but remains within safe margins for most automotive and industrial applications.
What package type does the SMAJ70AHE3_A/H use, and is it compatible with standard SMT processes?
The SMAJ70AHE3_A/H uses the SMA (DO-214AC) surface-mount package-a standardized, low-profile outline with 2.54 mm lead pitch and defined mechanical dimensions per the Vishay package drawing. It is fully compatible with standard SMT assembly processes: matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements, and the device is rated MSL Level 1 (peak reflow temperature 260 °C). The "H" in the ordering code indicates 7-inch tape-and-reel packaging (1800 units/reel), optimized for high-speed pick-and-place equipment in volume manufacturing.
SMAJ70AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70AHE3_A/H FAQ
1.How can I place an order for SMAJ70AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHE3_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 SMAJ70AHE3_A/H reliable?
The price and inventory of SMAJ70AHE3_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 SMAJ70AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ70AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHE3_A/H?
SMAJ70AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHE3_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 SMAJ70AHE3_A/H?
For technical support, including SMAJ70AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ70AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHE3_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 SMAJ70AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ70AHE3_A/H?
All SMAJ70AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHE3_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 SMAJ70AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ70AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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