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Vishay General Semiconductor - Diodes Division SMAJ70CAHM3_A/I
- Part No.:
- SMAJ70CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHM3_A/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ70CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 70 V standoff 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 (10/1000 μs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems against ESD and inductive switching surges.
For engineers reviewing the SMAJ70CAHM3_A/I datasheet, SMAJ70CAHM3_A/I pinout, SMAJ70CAHM3_A/I application, or SMAJ70CAHM3_A/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for bidirectional overvoltage protection with low incremental surge resistance, fast response time, and MSL Level 1 moisture sensitivity rating.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering consistent clamping performance across positive and negative transients. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while its thermal resistance (RθJA = 120 °C/W) supports operation up to +150 °C junction temperature under defined PCB pad conditions.
The device meets UL 497B recognition (QVGQ2) and is rated for 400 W peak pulse power below 78 V - derated to 300 W above that threshold. Its 10/1000 μs waveform capability and 3.5 A peak pulse current (IPPM) are validated with 0.2" × 0.2" copper pads per terminal, per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 70 V nominal circuits. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 113 V at 3.5 A - Clamping voltage limits downstream component stress during 10/1000 μs transients; critical for protecting 100 V-rated ICs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling capacity determines survivability against lightning-induced or inductive-spike energy. |
| IPPM | 3.5 A - Peak surge current capability directly correlates with transient energy absorption (E ≈ VC × IPPM × tp). |
| TJmax | +150 °C - Maximum junction temperature enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated placement and reflow. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or floating signal line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as anode or cathode depending on transient polarity; no cathode band marking required. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; copper pad layout (0.2" × 0.2") required to achieve rated thermal and pulse power performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring reliability under thermal cycling and vibration. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance mandates without compromising surge robustness or thermal performance. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity when properly laid out on PCB with recommended copper area. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and logic ICs. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without pre-baking, reducing manufacturing complexity and cost. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and temperature/pressure sensor outputs from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤113 V during 3.5 A surges, preserving signal integrity and preventing ADC saturation or latch-up in 3.3 V/5 V systems. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt induced transients before reaching precision op-amps and isolators. Use Value: Maintains <1.0 μA leakage at 70 V, ensuring minimal impact on loop accuracy while clamping 10/1000 μs spikes to safe levels. |
| Power Supply Rail Clamp | USB Port ESD Protection |
Use Scenario: Secondary overvoltage clamp on 70 V intermediate DC bus in telecom power supplies after primary regulation. IC Role / Device Role / Timing Role: Standby protection device triggered only during fault conditions (e.g., regulator failure or capacitor short). Use Value: Withstands repetitive 300 W surges above 78 V, enabling robust hold-up during brownout recovery without degradation. |
Use Scenario: Board-level ESD protection for USB 2.0 data lines (D+/D−) in embedded host devices operating in harsh environments. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed immediately at connector to divert ±15 kV HBM ESD pulses. Use Value: Symmetrical clamping ensures equal protection on both differential lines without skew; junction capacitance <100 pF avoids signal integrity loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3_A/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Preferred for commercial-grade automotive modules where halogen content is unrestricted. | Select SMAJ70CAHE3_A/I if halogen-free requirement is waived and cost optimization is prioritized. |
| SMAJ70AHE3_A/I | Unidirectional version; includes cathode band marking; identical VWM, VBR, VC, and PPPM. | Required only where circuit topology enforces DC bias and polarity-specific clamping (e.g., single-supply rail protection). | Choose SMAJ70AHE3_A/I only when unidirectional behavior is explicitly needed - otherwise SMAJ70CAHM3_A/I offers broader design flexibility. |
Compared with SMAJ70CAHE3_A/I, the SMAJ70CAHM3_A/I adds halogen-free construction without sacrificing surge rating or qualification; versus SMAJ70AHE3_A/I, it enables AC-coupled or floating-line protection without polarity constraints, simplifying layout and reducing BOM variants.
Availability
SMAJ70CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog input modules, and telecom power supply clamping requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMAJ70CAHM3_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, efficiency, and application-specific validation.
The SMAJ series was developed for high-energy transient suppression in space-constrained surface-mount designs, targeting automotive, industrial, and communications systems demanding AEC-Q101 compliance and repeatable clamping performance.
FAQ
What is the clamping voltage of SMAJ70CAHM3_A/I at its rated peak pulse current?
The SMAJ70CAHM3_A/I has a maximum clamping voltage (VC) of 113 V at its specified peak pulse current (IPPM) of 3.5 A under 10/1000 μs waveform conditions. This value is measured with the device mounted on 0.2" × 0.2" copper pads per terminal, as defined in the Vishay datasheet document 88390. The clamping voltage ensures protected circuits remain within safe operating limits during surge events.
Is SMAJ70CAHM3_A/I suitable for automotive applications?
Yes, SMAJ70CAHM3_A/I is AEC-Q101 qualified and specifically designated for automotive use via the "HM3" suffix, indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is deployed in engine control units, ADAS sensors, and infotainment interfaces where reliability under thermal cycling, humidity, and electrical transients is mandatory. The SMAJ70CAHM3_A/I meets UL 497B recognition for protector classification.
How does the bidirectional configuration of SMAJ70CAHM3_A/I affect its PCB layout?
The SMAJ70CAHM3_A/I has no polarity marking and functions identically in both directions, eliminating the need for orientation verification during placement. This simplifies PCB layout by allowing symmetric routing on AC-coupled or floating lines - such as differential buses or transformer-isolated interfaces - without concern for anode/cathode alignment. Its SMA (DO-214AC) footprint remains unchanged from unidirectional variants.
What is the maximum operating temperature for SMAJ70CAHM3_A/I?
The SMAJ70CAHM3_A/I has a maximum junction temperature (TJmax) of +150 °C, verified per the Vishay datasheet. This rating enables deployment in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating of peak pulse power applies above +25 °C ambient, per Figure 2 in document 88390, and proper copper pad thermal relief must be maintained to sustain this rating.
Does SMAJ70CAHM3_A/I meet moisture sensitivity requirements for lead-free reflow?
Yes, SMAJ70CAHM3_A/I is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This allows direct placement into standard lead-free reflow profiles without baking or special handling. The device's matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, ensuring robust interconnect reliability in high-volume SMT assembly.
SMAJ70CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ70CAHM3_A/I FAQ
1.How can I place an order for SMAJ70CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHM3_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 SMAJ70CAHM3_A/I reliable?
The price and inventory of SMAJ70CAHM3_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 SMAJ70CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHM3_A/I?
SMAJ70CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHM3_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 SMAJ70CAHM3_A/I?
For technical support, including SMAJ70CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ70CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHM3_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 SMAJ70CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHM3_A/I?
All SMAJ70CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHM3_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 SMAJ70CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ70CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAHM3_A/I Tags
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