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Vishay General Semiconductor - Diodes Division SMAJ70AHM3_A/I
- Part No.:
- SMAJ70AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHM3_A/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,363
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Product details
Overview
SMAJ70AHM3_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 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/I datasheet, SMAJ70AHM3_A/I pinout, SMAJ70AHM3_A/I application, or SMAJ70AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 120 °C/W), and junction temperature range (−55 °C to +150 °C).
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports automated placement and meets MSL level 1 reflow requirements (peak 260 °C).
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above 78 V per JEDEC JESD22-A114 standard; it sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits low incremental surge resistance for effective energy absorption during ESD or load-switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 77.8–86.0 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering under transient overvoltage conditions. |
| VC (Clamping Voltage) | 113 V at IPPM = 3.5 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Energy-handling capability under standardized surge waveform; critical for IEC 61000-4-5 compliance margin. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Low leakage preserves system efficiency and avoids false triggering in high-impedance circuits. |
| TJ Range | −55 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments without derating. |
| Package | SMA (DO-214AC) - Surface-mount footprint with 5.0 mm × 5.0 mm copper pad thermal design; supports automated assembly and IPC Class 2 whisker resistance. |
Pinout & Package
Package: SMA (DO-214AC), unidirectional configuration with cathode band marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or lower-potential rail; completes clamping loop during reverse surge. |
| Cathode | Protected line connection / transient input | Connected to line being protected (e.g., 12 V supply rail); avalanche conduction occurs between cathode and anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, body electronics, and ADAS modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for global OEMs and Tier 1 suppliers without compromising surge robustness or thermal performance. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV line-to-ground) surge immunity in DC power rails without external heat sinking. |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog circuitry sustains damage - essential for protecting CAN, LIN, and sensor signal paths. |
| Low RθJA (120 °C/W) | Enables operation at full power rating with minimal PCB copper area (0.2" × 0.2" pads), reducing layout complexity in space-constrained modules. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load-dump surges (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage to clamp transients before regulation. Use Value: Limits voltage to ≤113 V during 3.5 A surge, preventing overvoltage failure of buck controller ICs and gate drivers. |
Use Scenario: Analog output lines from pressure or temperature sensors in factory automation PLCs subject to ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted directly at connector interface to shunt fast transients before reaching ADC front-end or op-amp buffer. Use Value: Sub-1 ns response ensures clamping occurs prior to ADC sampling window, preserving measurement integrity. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
|
Use Scenario: −48 V telecom rectifier outputs feeding base station backplanes where lightning-induced surges propagate through distribution networks. IC Role / Device Role / Timing Role: Unidirectional SMAJ70AHM3_A/I installed upstream of hot-swap controllers and PMICs to absorb repetitive 10/1000 μs pulses. Use Value: 400 W rating enables sustained protection across multiple surge events without degradation, supporting GR-1089-CORE compliance. |
Use Scenario: 5 V USB VBUS line in smart home hubs exposed to user-insertion ESD and cable coupling noise. IC Role / Device Role / Timing Role: TVS placed adjacent to USB connector to clamp ±8 kV contact ESD (IEC 61000-4-2) before reaching USB switch or charging IC. Use Value: 1.0 μA max leakage at 5 V ensures no impact on USB suspend current budget; SMA footprint allows compact board placement. |
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/I | Same electrical specs, but RoHS-compliant (E3) instead of halogen-free (HM3); not AEC-Q101 qualified. | Approved for commercial/industrial use only; excluded from automotive production due to missing AEC-Q101 certification. | Select SMAJ70AHE3_A/I only if halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMAJ70A-M3/5A | Identical halogen-free RoHS spec and AEC-Q101 qualification, but supplied in 13" tape-and-reel (5A) vs. 7" (I) - same die and package. | No functional difference; packaging variant affects reel logistics and SMT feeder compatibility only. | Choose SMAJ70A-M3/5A when large-volume automated assembly requires 7500-unit reels instead of 1800-unit reels. |
Compared with SMAJ70AHE3_A/I, SMAJ70AHM3_A/I adds halogen-free compliance and AEC-Q101 qualification - essential for automotive Tier 1 supply chains - while SMAJ70A-M3/5A differs solely in packaging format, offering identical protection performance in high-volume manufacturing.
Availability
SMAJ70AHM3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC input conditioning, and consumer USB power line safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMAJ70AHM3_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, rectifiers, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SMAJ series was developed specifically for high-energy transient suppression in harsh environments - targeting ISO 7637-2, IEC 61000-4-5, and AEC-Q101-compliant applications across automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMAJ70AHM3_A/I at its rated peak pulse current?
The SMAJ70AHM3_A/I has a maximum clamping voltage (VC) of 113 V at a peak pulse current (IPPM) of 3.5 A under the 10/1000 μs waveform. This value is measured per JEDEC JESD22-A114 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ70AHM3_A/I maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C), ensuring consistent protection in automotive under-hood deployments.
Is SMAJ70AHM3_A/I qualified for automotive applications?
Yes, SMAJ70AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" = revision A). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - making SMAJ70AHM3_A/I suitable for engine control units, body electronics, and ADAS systems. The AEC-Q101 status is documented in Vishay's official datasheet (Document Number: 88390, Revision: 09-Jan-2024).
How does the HM3 suffix differ from E3 or M3 in the SMAJ70A family?
The HM3 suffix in SMAJ70AHM3_A/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - a stricter specification than E3 (RoHS only, no AEC-Q101) or M3 (halogen-free RoHS only, no AEC-Q101). All three share identical electrical parameters and SMA package dimensions, but only HM3 meets full automotive production requirements. The "A/I" denotes revision A and 7" tape-and-reel packaging (1800 units per reel).
What is the thermal resistance of SMAJ70AHM3_A/I, and how does it affect PCB layout?
SMAJ70AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet Figure 5. To maintain full 400 W surge rating, designers must allocate adequate copper area and avoid excessive trace length; insufficient copper increases junction temperature and reduces surge endurance. The SMAJ70AHM3_A/I's RθJL of 30 °C/W further supports efficient heat transfer to PCB planes.
Can SMAJ70AHM3_A/I be used in bidirectional configurations?
No, SMAJ70AHM3_A/I is strictly unidirectional, as indicated by the "A" (not "CA") suffix and presence of cathode band marking. Bidirectional variants such as SMAJ70CA require separate part numbers and exhibit symmetrical breakdown in both polarities. Using SMAJ70AHM3_A/I in reverse-biased AC applications would result in forward conduction and potential failure. For bidirectional protection at 70 V standoff, specify SMAJ70CA with appropriate suffix (e.g., SMAJ70CAHM3_A/I).
SMAJ70AHM3_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:
- 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/I FAQ
1.How can I place an order for SMAJ70AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHM3_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 SMAJ70AHM3_A/I reliable?
The price and inventory of SMAJ70AHM3_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 SMAJ70AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ70AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHM3_A/I?
SMAJ70AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHM3_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 SMAJ70AHM3_A/I?
For technical support, including SMAJ70AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ70AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHM3_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 SMAJ70AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ70AHM3_A/I?
All SMAJ70AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHM3_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 SMAJ70AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ70AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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