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Vishay General Semiconductor - Diodes Division SMAJ70A-M3/61
- Part No.:
- SMAJ70A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70A-M3/61.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ70A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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.
For engineers reviewing the SMAJ70A-M3/61 datasheet, SMAJ70A-M3/61 pinout, SMAJ70A-M3/61 application, or SMAJ70A-M3/61 equivalent, key selection criteria include clamping performance under 3.5 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and suitability for automotive-grade designs when paired with AEC-Q101 qualified variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 70 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
The device is rated for 40 A non-repetitive forward surge current (IFSM) and derates linearly above 25 °C ambient per Fig. 2; maximum junction temperature is 150 °C, and thermal resistance from junction-to-lead is 30 °C/W - critical for PCB copper pad layout design per recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; defines system's normal operating margin. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage limits downstream IC stress during 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power handling capacity with standard 10/1000 μs waveform; reduced to 300 W above 78 V. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), supporting robust protection against motor-switching transients. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; requires minimum copper pad area (0.2" × 0.2") for safe 3.3 W steady-state dissipation. |
| Package | SMA (DO-214AC) - Low-profile SMD outline compatible with automated placement; cathode marked by band. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line's lower-potential side (e.g., GND or return path); enables clamping to ground during positive transients. |
| Cathode | Avalanche conduction terminal | Marked by band; connected to protected line's higher-potential side (e.g., VIN, signal line); conducts surge current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection of 12–48 V industrial and automotive power rails against ISO 7637-2 Pulse 1/2a/5a-level transients. |
| 113 V clamping voltage @ 3.5 A | Limits voltage seen by downstream MOSFET gate drivers or microcontroller I/O pins during surge events. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and JEDEC J-STD-20 MSL level 1 reflow profile (260 °C peak). |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection fidelity for high-speed interfaces. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs from load-dump and inductive switching transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional shunt clamp on main power input, triggered within nanoseconds to divert surge energy to ground. Use Value: Limits peak voltage to ≤113 V during 3.5 A transients, preventing damage to 36 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital sensor interfaces (I²C, SPI) in factory automation PLC modules. IC Role / Device Role / Timing Role: Point-of-entry TVS placed directly at connector, clamping ESD and cable-coupled noise before signal conditioning circuitry. Use Value: Sub-1 ns response and <1 μA leakage at 70 V preserve signal integrity while enabling >8 kV contact ESD immunity (IEC 61000-4-2). |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Primary unidirectional TVS on input bus, coordinated with upstream fuses and secondary filtering. Use Value: 400 W pulse rating handles 10/1000 μs lightning surges (IEC 61000-4-5 Level 3), while 150 °C max TJ supports operation in sealed enclosures. |
Use Scenario: Shielding BLDC motor driver ICs and gate drivers from back-EMF spikes generated during commutation in smart home appliances. IC Role / Device Role / Timing Role: Localized TVS across motor phase terminals or supply rails, absorbing repetitive inductive kickback. Use Value: 40 A IFSM withstands repeated 8.3 ms half-sine surges; low RθJL (30 °C/W) allows efficient heat transfer to PCB copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade cost-sensitive designs where halogen-free certification is not mandated. | Select SMAJ70A-E3/61 if halogen-free compliance is unnecessary and lead-free soldering compatibility is sufficient. |
| SMAJ70CA-M3/61 | Bidirectional variant: symmetric VBR (77.8–86.0 V), no polarity marking, same VC and PPPM. | Required for AC-coupled lines or bidirectional data buses (e.g., RS-485) where polarity reversal may occur. | Choose SMAJ70CA-M3/61 only when protecting balanced or alternating-polarity signals; not drop-in for unidirectional layouts. |
Compared with SMAJ70A-E3/61, the SMAJ70A-M3/61 adds halogen-free compliance without sacrificing electrical performance; versus SMAJ70CA-M3/61, it provides polarity-specific clamping essential for DC power rail protection, avoiding unintended conduction in grounded systems.
Availability
SMAJ70A-M3/61 is available at Aetrix Electronics and suitable for automotive ECU power inputs, industrial sensor interface protection, telecom -48 V DC distribution, and consumer appliance motor drive circuits requiring stable component supply with halogen-free compliance.
Supply support for SMAJ70A-M3/61 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, power efficiency, and AEC-Q101 qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high-energy surge immunity and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMAJ70A-M3/61 and how is it measured?
The SMAJ70A-M3/61 has a maximum clamping voltage (VC) of 113 V, measured at a peak pulse current (IPPM) of 3.5 A using a 10/1000 μs waveform per IEC 61000-4-5. This value represents the upper voltage limit imposed on protected circuitry during standardized surge events, and is confirmed in the Vishay datasheet Document Number 88390, page 2. The SMAJ70A-M3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ70A-M3/61 suitable for automotive applications?
SMAJ70A-M3/61 itself is not AEC-Q101 qualified; however, it belongs to the SMAJ family for which Vishay offers AEC-Q101 variants (e.g., SMAJ70A-HM3_X). The SMAJ70A-M3/61 shares identical electrical specifications and packaging with those qualified versions, making it suitable for non-safety-critical automotive subsystems where halogen-free RoHS compliance is required but formal qualification is not mandated. Always verify qualification status via the specific ordering code before use in safety-related systems.
How does the M3 suffix differ from E3 in SMAJ70A-M3/61?
The M3 suffix in SMAJ70A-M3/61 indicates halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, whereas E3 denotes RoHS-compliant but non-halogen-free material. Both meet JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow standards. The SMAJ70A-M3/61 is preferred for environmentally regulated markets (e.g., EU WEEE, China RoHS II) where brominated flame retardants are restricted. Electrical and thermal specs are identical between M3 and E3 variants.
What is the thermal resistance and recommended PCB layout for SMAJ70A-M3/61?
SMAJ70A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated power dissipation. Reducing pad size increases thermal impedance and risks exceeding the 150 °C maximum junction temperature under sustained 3.3 W power dissipation. The SMAJ70A-M3/61 must be placed with adequate copper area and minimal trace length to ensure effective heat transfer.
Can SMAJ70A-M3/61 be used in bidirectional signal lines?
No - SMAJ70A-M3/61 is a unidirectional TVS diode with cathode band marking; it conducts only when the cathode is at higher potential than the anode. Using it on bidirectional lines (e.g., RS-485, USB D+/D−) risks failure during negative transients. For such applications, the bidirectional variant SMAJ70CA-M3/61 must be selected. The SMAJ70A-M3/61 is strictly intended for DC power rails or unidirectional signal paths referenced to ground.
SMAJ70A-M3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70A-M3/61 FAQ
1.How can I place an order for SMAJ70A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70A-M3/61 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 SMAJ70A-M3/61 reliable?
The price and inventory of SMAJ70A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70A-M3/61?
SMAJ70A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70A-M3/61 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 SMAJ70A-M3/61?
For technical support, including SMAJ70A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70A-M3/61 requirements.
6.How does Aetrix verify that SMAJ70A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70A-M3/61 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 SMAJ70A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70A-M3/61?
All SMAJ70A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70A-M3/61, 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 SMAJ70A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ70A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70A-M3/61 Tags
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