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Vishay General Semiconductor - Diodes Division SMAJ70AHM3/I
- Part No.:
- SMAJ70AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHM3/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,709
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Product details
Overview
SMAJ70AHM3/I 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/I datasheet, SMAJ70AHM3/I pinout, SMAJ70AHM3/I application, or SMAJ70AHM3/I 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 assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, limiting transient energy to protected downstream circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports high surge current handling (IFSM = 40 A) and meets MSL level 1 reflow requirements (peak 260 °C).
The SMAJ70AHM3/I variant is halogen-free, RoHS-compliant, and AEC-Q101 qualified - indicated by the "HM3" suffix and "I" tape-and-reel packaging code. It delivers 300 W peak pulse power above 78 V per specification note (1), with derating applied above TA = 25 °C per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC working margin. |
| VBR (Breakdown Voltage) | 77.8–86.0 V at IT = 1 mA - guaranteed avalanche initiation range; ensures predictable clamping onset. |
| VC (Clamping Voltage) | 113 V at IPPM = 3.5 A (10/1000 μs) - peak voltage seen by protected circuit during surge; determines minimum withstand rating needed downstream. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - transient energy absorption capacity under standardized waveform; defines single-event robustness. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - low standby power loss and minimal interference in high-impedance sensing paths. |
| TJ Range | –55 to +150 °C - enables deployment in under-hood automotive, industrial motor drives, and outdoor power electronics. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on 0.2" × 0.2" copper pads; informs heatsinking and layout decisions. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; polarity marked by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to lower-potential side (e.g., ground or return rail); completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 70 V supply rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control units and ADAS power rails. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier-1 automotive suppliers and industrial OEMs without compromising surge performance. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly laid out - reduces need for secondary protection stages. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving clamping precision for sensitive gate drivers. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning - supports high-yield automated assembly in volume production. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 70 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between main supply rail and ground. Use Value: Limits voltage to ≤113 V during 3.5 A surge, preventing damage to 80 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Shielding analog input pins of industrial pressure sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-leakage (1 μA) TVS connected across differential signal pair and ground. Use Value: Maintains signal integrity below 70 V operating range while suppressing ±15 kV contact ESD per IEC 61000-4-2. |
| Motor Drive Gate Driver Protection | Telecom DC Power Input Protection |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in 48 V BLDC inverters from Miller-induced spikes. IC Role / Device Role / Timing Role: Fast-response (sub-ns) TVS tied between gate and source terminals. Use Value: Clamps gate-source voltage to <113 V within nanoseconds, avoiding unintended turn-on and device failure. |
Use Scenario: Front-end surge suppression on –48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS installed between output rail and chassis ground. Use Value: Absorbs 400 W transient energy per IEC 61000-4-5, enabling compliance with GR-1089-CORE Class B immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70AHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification; uses "E3" suffix instead of "HM3". | Lacks halogen-free material declaration; acceptable for commercial/industrial use where automotive compliance is not required. | Select SMAJ70AHE3/I for cost-sensitive non-automotive designs where halogen-free is not mandated. |
| SMAJ70A-M3/5A | Identical electrical and thermal specs; differs only in packaging - 13" reel (5A) vs. 7" reel (I); "M3" denotes halogen-free RoHS. | No functional difference; choice depends solely on production line feeder compatibility and order quantity. | Choose SMAJ70A-M3/5A when high-volume SMT placement requires 7500-unit reels and halogen-free compliance is required. |
Compared with SMAJ70AHM3/I, SMAJ70AHE3/I omits halogen-free assurance but retains AEC-Q101 qualification, while SMAJ70A-M3/5A matches all material and reliability specs but changes tape-and-reel format - both require no schematic or layout change.
Availability
SMAJ70AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, motor drive gate protection, and telecom power input circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ70AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 validation, and precise clamping performance are critical.
FAQ
What is the clamping voltage of SMAJ70AHM3/I at its rated peak pulse current?
The SMAJ70AHM3/I has a maximum clamping voltage (VC) of 113 V at a peak pulse current (IPPM) of 3.5 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 of Vishay document 88390, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ70AHM3/I maintains this clamping performance across its qualified operating temperature range.
Is SMAJ70AHM3/I suitable for automotive applications?
Yes, SMAJ70AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and documentation in Vishay's 88390 datasheet. It undergoes stress testing for temperature cycling, high-temperature reverse bias, and surge endurance - making it appropriate for engine control units, body electronics, and ADAS power domains. The SMAJ70AHM3/I also meets MSL Level 1 for lead-free reflow compatibility.
What does the "HM3" suffix indicate in SMAJ70AHM3/I?
The "HM3" suffix in SMAJ70AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from "E3" (RoHS only) and "HE3" (RoHS + AEC-Q101, non-halogen-free) variants. This designation is defined in the Ordering Information section of Vishay document 88390 and confirms compliance with automotive material restrictions and environmental standards.
How does SMAJ70AHM3/I differ from SMAJ70A-M3/5A?
SMAJ70AHM3/I and SMAJ70A-M3/5A share identical electrical, thermal, and reliability specifications - including VWM = 70 V, VC = 113 V, AEC-Q101 qualification, and halogen-free RoHS compliance. Their only differences are packaging format ("I" = 7" reel, 1800 units; "5A" = 13" reel, 7500 units) and ordering code structure. The SMAJ70AHM3/I is functionally interchangeable with SMAJ70A-M3/5A in design and layout.
What is the maximum operating junction temperature for SMAJ70AHM3/I?
The SMAJ70AHM3/I has a maximum operating junction temperature (TJ max.) of +150 °C and a minimum of –55 °C, as specified in the Thermal Characteristics table of Vishay document 88390. This wide range supports deployment in under-hood automotive locations and industrial enclosures without active cooling, provided board-level thermal design respects RθJA = 120 °C/W on recommended copper pad areas.
SMAJ70AHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMAJ70AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHM3/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/I reliable?
The price and inventory of SMAJ70AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ70AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHM3/I?
SMAJ70AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHM3/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/I?
For technical support, including SMAJ70AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHM3/I requirements.
6.How does Aetrix verify that SMAJ70AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ70AHM3/I?
All SMAJ70AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ70AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70AHM3/I Tags
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