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Vishay General Semiconductor - Diodes Division SMAJ70AHE3_A/I
- Part No.:
- SMAJ70AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHE3_A/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,667
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Product details
Overview
SMAJ70AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising 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 (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - optimized for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ70AHE3_A/I datasheet, SMAJ70AHE3_A/I pinout, SMAJ70AHE3_A/I application, or SMAJ70AHE3_A/I equivalent, this part delivers AEC-Q101 qualification, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and surge protection design in automotive ECUs and industrial control modules.
Technical Context
The SMAJ70AHE3_A/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to shunt transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
With a thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), it supports sustained power dissipation up to 3.3 W at 50 °C ambient when mounted on recommended 5.0 mm × 5.0 mm copper pads - enabling robust thermal performance without heatsinking in space-constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during transients. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage limits downstream device stress during 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power handling capability per standard 10/1000 μs waveform (duty cycle ≤ 0.01 %). |
| ID @ VWM | 1.0 μA - Ultra-low reverse leakage preserves system efficiency and minimizes standby power loss. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
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 conduction terminal | Connected to protected line (e.g., VCC or signal trace); conducts during forward surge or bias conditions. |
| Cathode | Clamping reference terminal | Connected to ground or lower-potential rail; defines reverse-biased clamping path for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements - enables use in engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation when properly laid out. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to downstream ICs - critical for 75 V-rated gate drivers and CAN transceivers. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles - no pre-baking required for SMT assembly. |
| Glass passivated junction | Ensures stable VBR drift < ±5 % over 1000 hrs at TJ = 125 °C - supports long-life industrial deployments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) and ISO 7637-2 pulses on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp positive-going surges before they reach LDOs or microcontrollers. Use Value: Limits peak voltage to ≤113 V during 3.5 A transients - preventing latch-up or oxide breakdown in 3.3 V/5 V logic rails. |
Use Scenario: Guarding analog front-ends of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential signal pairs (e.g., RS-485, CAN) to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 μA leakage at 70 V maintains sensor offset accuracy; fast response (<1 ns) prevents data corruption during transient coupling. |
| DC Motor Drive Output Protection | Telecom Power Supply Input Protection |
|
Use Scenario: Mitigating inductive kickback from brushed DC motors driving HVAC actuators or window lifters. IC Role / Device Role / Timing Role: Placed across motor terminals or H-bridge outputs to clamp flyback voltages exceeding MOSFET VDS ratings. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), enabling robust protection against repeated switching transients. |
Use Scenario: Safeguarding AC/DC adapter inputs against lightning-induced surges on PoE-powered telecom equipment. IC Role / Device Role / Timing Role: First-stage clamping device upstream of bridge rectifier to limit input surge energy entering primary-side circuitry. Use Value: 400 W PPPM rating handles 10/1000 μs surges up to 1 kV - reducing need for secondary MOV-based protection stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70AHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free materials are mandated by OEM environmental policy. | Direct material substitution when halogen-free compliance is required; same footprint and thermal behavior. |
| SMAJ70A-E3/5A | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC, but rated for -55 °C to +150 °C without automotive qualification testing. | Suitable for non-automotive industrial or consumer applications where AEC-Q101 is not mandated. | Lower-cost option for non-automotive designs; verify system-level reliability requirements before substitution. |
Compared with SMAJ70AHE3_A/I, the HM3 variant adds halogen-free compliance without altering surge performance, while the E3/5A version omits AEC-Q101 validation - making it appropriate for cost-sensitive commercial systems where automotive qualification is unnecessary.
Availability
SMAJ70AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power supplies requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ70AHE3_A/I 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 was developed specifically for board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding high surge immunity and long-term stability.
FAQ
What is the clamping voltage of SMAJ70AHE3_A/I at its rated peak pulse current?
The SMAJ70AHE3_A/I has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during transient events - critical for ensuring compatibility with 75 V-rated downstream components like gate drivers and interface ICs.
Is SMAJ70AHE3_A/I suitable for automotive applications?
Yes, SMAJ70AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it appropriate for engine control units, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is mandatory.
What is the package type and mounting configuration of SMAJ70AHE3_A/I?
SMAJ70AHE3_A/I uses the SMA (DO-214AC) surface-mount package - a compact, low-profile case measuring 4.50 mm × 2.79 mm × 2.29 mm. It features a unidirectional configuration with a visible cathode band, matte tin-plated leads, and is compatible with standard reflow soldering profiles (MSL Level 1, peak 260 °C). The recommended pad layout is 5.0 mm × 5.0 mm copper per terminal.
How does SMAJ70AHE3_A/I differ from SMAJ70A-E3/5A?
SMAJ70AHE3_A/I and SMAJ70A-E3/5A share identical electrical characteristics (VWM = 70 V, VBR = 77.8–86.0 V, VC = 113 V), but SMAJ70AHE3_A/I is AEC-Q101 qualified and RoHS-compliant, whereas SMAJ70A-E3/5A is commercial-grade without automotive qualification. The HE3 variant also uses different packaging tape/reel configuration (I-code = 7500 pcs per 13″ reel), supporting high-volume automotive production traceability.
What is the maximum reverse leakage current for SMAJ70AHE3_A/I at its stand-off voltage?
The SMAJ70AHE3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 70 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves system efficiency in always-on automotive modules and ensures minimal impact on precision sensor bias networks - verified per Vishay's electrical characteristics table in Document Number 88390.
SMAJ70AHE3_A/I 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/I FAQ
1.How can I place an order for SMAJ70AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHE3_A/I 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/I reliable?
The price and inventory of SMAJ70AHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMAJ70AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHE3_A/I?
SMAJ70AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHE3_A/I 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/I?
For technical support, including SMAJ70AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ70AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMAJ70AHE3_A/I?
All SMAJ70AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMAJ70AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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