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Vishay General Semiconductor - Diodes Division SMAJ70AHM3/H
- Part No.:
- SMAJ70AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AHM3/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,075
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Product details
Overview
SMAJ70AHM3/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 rails.
For engineers reviewing the SMAJ70AHM3/H datasheet, SMAJ70AHM3/H pinout, SMAJ70AHM3/H application, or SMAJ70AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for fast response (<1 ns) and low incremental surge resistance. Its clamping action begins above 70 V reverse stand-off and fully engages at 113 V under 3.5 A transient current, limiting energy dissipation to safe levels for downstream components.
The SMAJ70AHM3/H is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and exhibits a +0.105 %/°C temperature coefficient of VBR - enabling predictable voltage threshold drift across -55 °C to +150 °C operating range. Thermal resistance is 120 °C/W junction-to-ambient (on recommended pad layout) and 30 °C/W junction-to-lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - guaranteed breakdown window defining turn-on threshold |
| VC @ IPPM | 113 V at 3.5 A - clamped voltage during 10/1000 μs transient, limiting stress on protected circuit |
| PPPM | 400 W - peak pulse power handling capability per standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" length and 0.157" width |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; conducts during forward surge events |
| Cathode | Clamping node (marked with band) | Connected to higher-potential side; initiates avalanche conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power rails |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising thermal or electrical performance |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems with margin |
| Low profile SMA package | Enables high-density PCB layouts and compatibility with standard SMT pick-and-place equipment |
| 150 °C junction temperature rating | Supports reliable operation in under-dash, power supply, and motor drive environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power input and ground. Use Value: Limits transient voltage to ≤113 V, preventing damage to 36 V-rated DC-DC converters and microcontrollers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Signal-line TVS connected between sensor output and ground. Use Value: Sub-1 ns response and <1.0 μA leakage preserve signal integrity and minimize offset error in precision measurement circuits. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side controllers from lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Secondary-side TVS on DC bus feeding controller IC. Use Value: 400 W pulse rating absorbs 10/1000 μs surges up to 3.5 A without degradation, extending adapter lifetime. | Use Scenario: Preventing gate oxide rupture in N-channel power MOSFETs due to inductive switching spikes. IC Role / Device Role / Timing Role: Clamping diode from gate to source, referenced to driver IC ground. Use Value: 113 V clamping voltage ensures gate-source voltage stays within ±20 V absolute maximum rating during 100 V transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70AHE3/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade power supplies, not automotive | Select when halogen-free or automotive qualification is not required |
| SMBJ70A-H | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600 W PPPM rating | Better thermal dissipation for high-duty-cycle surges; requires larger PCB area | Select when higher pulse power margin or improved thermal performance is needed |
Compared with SMAJ70AHM3/H, SMAJ70AHE3/H omits halogen-free and AEC-Q101 compliance - reducing cost for non-automotive use - while SMBJ70A-H trades compactness for 50 % higher pulse power and lower RθJA, making it preferable in thermally constrained high-energy surge scenarios.
Availability
SMAJ70AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and consumer power adapter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ70AHM3/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, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in space-constrained, high-reliability applications - particularly where AEC-Q101 qualification, halogen-free compliance, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ70AHM3/H and how is it measured?
The SMAJ70AHM3/H has a maximum clamping voltage (VC) of 113 V, measured at a peak pulse current (IPPM) of 3.5 A using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during a transient event and is guaranteed across the full operating temperature range of -55 °C to +150 °C. The SMAJ70AHM3/H achieves this clamping performance via controlled avalanche breakdown in its glass-passivated junction.
Is SMAJ70AHM3/H suitable for automotive applications?
Yes, SMAJ70AHM3/H is AEC-Q101 qualified and specifically designated for automotive use - confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It meets requirements for under-hood and body electronics subjected to ISO 7637-2 load dump, jump start, and coupled transient immunity testing. The SMAJ70AHM3/H's 150 °C junction rating and MSL Level 1 moisture sensitivity further validate its suitability for automotive production environments.
What does the "HM3" suffix mean in SMAJ70AHM3/H?
The "HM3" suffix in SMAJ70AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from commercial-grade variants like "E3". This suffix confirms compliance with automotive environmental standards (e.g., JESD201 Class 2 whisker resistance), UL 94 V-0 flammability, and lead-free solderability per J-STD-002. The "H" indicates tape-and-reel packaging in 7" reels (1800 units), and the "/H" at the end specifies the revision code per Vishay's ordering nomenclature.
How does SMAJ70AHM3/H compare to SMAJ70AHE3/H?
SMAJ70AHM3/H and SMAJ70AHE3/H share identical electrical specifications (VWM = 70 V, VC = 113 V, PPPM = 400 W), but differ in qualification and material content: SMAJ70AHM3/H is halogen-free and AEC-Q101 qualified, whereas SMAJ70AHE3/H is RoHS-compliant but contains halogens and lacks automotive qualification. Both use the same SMA (DO-214AC) package and are pin-compatible. The SMAJ70AHM3/H is required for automotive Tier 1 suppliers; SMAJ70AHE3/H suffices for commercial power supplies.
What is the thermal resistance of SMAJ70AHM3/H and how does it affect layout?
The SMAJ70AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking; exceeding 3.3 W steady-state power dissipation will cause excessive junction heating. For reliable operation, PCB layout must allocate adequate copper area and avoid thermal isolation - especially critical in automotive applications where ambient temperatures reach 125 °C. The SMAJ70AHM3/H's RθJL of 30 °C/W supports efficient heat transfer to PCB traces.
SMAJ70AHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ70AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AHM3/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/H reliable?
The price and inventory of SMAJ70AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ70AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AHM3/H?
SMAJ70AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AHM3/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/H?
For technical support, including SMAJ70AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AHM3/H requirements.
6.How does Aetrix verify that SMAJ70AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ70AHM3/H?
All SMAJ70AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ70AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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