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Vishay General Semiconductor - Diodes Division SMAJ70CAHM3P/I
- Part No.:
- SMAJ70CAHM3P/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHM3P/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,666
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Product details
Overview
SMAJ70CAHM3P/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 or power lines. It features 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), suitable for automotive sensor line protection per AEC-Q101.
For engineers reviewing the SMAJ70CAHM3P/I datasheet, SMAJ70CAHM3P/I pinout, SMAJ70CAHM3P/I application, or SMAJ70CAHM3P/I equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive surge events.
The device uses a planar junction structure housed in an SMA (DO-214AC) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring appropriate PCB copper pad area (0.2" × 0.2") for rated 400 W pulse power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage |
| VC @ IPPM | 113 V at 3.5 A - Clamped voltage level limiting downstream circuit stress during 10/1000 μs surge |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capacity with defined waveform |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMA (DO-214AC) - Low-profile SMT footprint compatible with automated assembly and IPC-7351B land patterns |
| Qualification | AEC-Q101 qualified - Validated for automotive electronics per stress test requirements including HTRB, ACSD, and TCT |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), cathode band absent per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path for both positive and negative surges relative to cathode terminal |
| Cathode | Transient return path (bidirectional) | Functions identically to anode in CA-series devices; terminals are interchangeable for clamping function |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV) surges when mounted on 5.0 mm × 5.0 mm copper pads |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics |
| Halogen-free & RoHS | Complies with JEDEC J-STD-020 MSL Level 1 and automotive material restrictions (Vishay HM3 suffix) |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during fast transients, reducing risk of IC latch-up or gate oxide damage |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ps to limit transient amplitude. Use Value: Prevents damage to 5 V or 3.3 V interface ICs by clamping surges to ≤113 V while maintaining <1.0 μA leakage at 70 V operating voltage. | Use Scenario: Safeguarding differential CAN_H/CAN_L lines against ESD (IEC 61000-4-2) and burst noise (IEC 61000-4-4) in factory automation controllers. IC Role / Device Role / Timing Role: Paired TVS configuration across differential pair, leveraging symmetric breakdown to preserve common-mode rejection during transients. Use Value: Maintains CAN signal integrity up to 1 Mbps by limiting clamping-induced distortion and supporting >3000 cycles of 8 kV contact ESD per AEC-Q101 stress profile. |
| Consumer Power Adapter Input Stage | Telecom DSL Line Surge Suppression |
Use Scenario: Secondary-side DC input protection for USB-C PD adapters and AC/DC converters exposed to mains-borne surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after rectification but before primary controller IC, absorbing residual spikes from transformer leakage inductance. Use Value: Withstands 40 A non-repetitive forward surge (IFSM) and provides 3.3 W steady-state power dissipation, enabling compact board layout without heatsinking. | Use Scenario: Primary protection for ADSL/VDSL line drivers and POTS interfaces subjected to lightning-induced longitudinal surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Bidirectional clamp installed between tip/ring and ground, meeting GR-1089-CORE Level 3 surge immunity requirements. Use Value: Delivers 113 V clamping at 3.5 A with <0.1 % duty cycle derating, ensuring sustained operation across -40 °C to +125 °C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3_A/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use only; not approved for automotive production | Select when halogen-free content and automotive qualification are not required |
| SMBJ70CAHM3 | Higher 600 W PPPM rating; SMB (DO-214AA) package with larger thermal mass | Better suited for higher-energy surges; requires larger PCB footprint and different land pattern | Choose when system-level surge testing exceeds 400 W or thermal margin is constrained |
Compared with SMAJ70CAHE3_A/I, SMAJ70CAHM3P/I adds halogen-free construction and AEC-Q101 validation-critical for Tier 1 automotive supply chains-while SMBJ70CAHM3 trades compactness for enhanced surge robustness, necessitating layout revision.
Availability
SMAJ70CAHM3P/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, and telecom line interface designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ70CAHM3P/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and high-volume manufacturability.
The SMAJ series targets cost-sensitive, high-reliability transient suppression in automotive, industrial, and communications systems-designed specifically for surface-mount compatibility, automated placement, and AEC-Q101 compliance where needed.
FAQ
What does the 'HM3P/I' suffix indicate in SMAJ70CAHM3P/I?
The 'HM3' denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction; 'P' specifies tape-and-reel packaging in 7-inch reels; and '/I' indicates the revision code per Vishay's ordering nomenclature. This confirms SMAJ70CAHM3P/I meets automotive-grade material and reliability standards, unlike commercial variants such as SMAJ70CA-E3.
Is SMAJ70CAHM3P/I unidirectional or bidirectional, and how is polarity identified?
SMAJ70CAHM3P/I is a bidirectional TVS diode, meaning it clamps voltage transients equally in both polarities. Unlike unidirectional versions, it has no cathode band marking-both terminals are functionally identical and interchangeable in circuit layout, simplifying design for AC or floating signal paths.
What is the maximum clamping voltage of SMAJ70CAHM3P/I under standard test conditions?
The maximum clamping voltage (VC) of SMAJ70CAHM3P/I is 113 V, measured at a peak pulse current (IPPM) of 3.5 A using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuits during surge events, directly impacting downstream IC survivability.
Does SMAJ70CAHM3P/I require derating above 25 °C ambient temperature?
Yes-SMAJ70CAHM3P/I must be derated linearly above TA = 25 °C per Figure 2 in the Vishay datasheet (Doc. #88390). At 85 °C ambient, its 400 W peak pulse power rating reduces to approximately 280 W, and its 3.3 W steady-state power dissipation drops to ~2.2 W, requiring thermal design validation for high-temperature deployments.
Can SMAJ70CAHM3P/I be used in place of SMAJ70A in a design?
No-SMAJ70CAHM3P/I is bidirectional while SMAJ70A is unidirectional; substituting them without circuit review risks improper clamping during negative transients. Additionally, SMAJ70A has a cathode band and forward voltage drop (~3.5 V at 25 A), whereas SMAJ70CAHM3P/I exhibits symmetric behavior and no forward conduction path, making direct replacement invalid.
SMAJ70CAHM3P/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:
- -
- 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)
SMAJ70CAHM3P/I FAQ
1.How can I place an order for SMAJ70CAHM3P/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHM3P/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 SMAJ70CAHM3P/I reliable?
The price and inventory of SMAJ70CAHM3P/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHM3P/I is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHM3P/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHM3P/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHM3P/I?
SMAJ70CAHM3P/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHM3P/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 SMAJ70CAHM3P/I?
For technical support, including SMAJ70CAHM3P/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHM3P/I requirements.
6.How does Aetrix verify that SMAJ70CAHM3P/I is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHM3P/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 SMAJ70CAHM3P/I meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHM3P/I?
All SMAJ70CAHM3P/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHM3P/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 SMAJ70CAHM3P/I part is unused and in its original packaging.
Return procedure for SMAJ70CAHM3P/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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